Merge branch 'chausie'

.drone.yml

@@ -10,4 +10,4 @@ pipeline:
       - docker push eu.gcr.io/avatao-challengestore/tutorial-framework:${DRONE_TAG}
     when:
       event: 'tag'
-      branch: refs/tags/ocicat-20*
+      branch: refs/tags/chausie-20*

.git-hooks/apply_hooks.sh

@@ -1,22 +0,0 @@
-#!/usr/bin/env bash
-set -eu
-set -o pipefail
-set -o errtrace
-shopt -s expand_aliases
-
-[ "$(uname)" == "Darwin" ] && alias readlink="greadlink" || :
-
-GREEN='\033[0;32m'
-NC='\033[0m'
-
-
-here="$(dirname "$(readlink -f "$0")")"
-cd "${here}/../.git/hooks"
-
-rm -f pre-push pre-commit || :
-prepush_script="../../.git-hooks/pre-push.sh"
-precommit_script="../../.git-hooks/pre-commit.sh"
-[ -f "${prepush_script}" ] && ln -s "${prepush_script}" pre-push
-[ -f "${precommit_script}" ] && ln -s "${precommit_script}" pre-commit
-
-echo -e "\n${GREEN}Done! Hooks applied, you can start committing and pushing!${NC}\n"

.git-hooks/pre-push.sh

@@ -1,18 +0,0 @@
-#!/usr/bin/env bash
-set -eu
-set -o pipefail
-set -o errtrace
-shopt -s expand_aliases
-
-RED='\033[0;31m'
-GREEN='\033[0;32m'
-NC='\033[0m'
-
-
-echo -e "Running pylint...\n"
-if pylint lib; then
-  echo -e "\n${GREEN}Pylint found no errors!${NC}\n"
-else
-  echo -e "\n${RED}Pylint failed with errors${NC}\n"
-  exit 1
-fi

.pylintrc

@@ -6,6 +6,7 @@ disable = missing-docstring, too-few-public-methods, invalid-name
 
 [SIMILARITIES]
 
+min-similarity-lines=8
 ignore-comments=yes
 ignore-docstrings=yes
 ignore-imports=yes

Dockerfile

@@ -1,12 +1,8 @@
+FROM avatao/frontend-tutorial-framework:chausie-20190912 as frontend
 FROM avatao/debian:buster
 
-RUN curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -                                     &&\
+RUN apt-get update                           &&\
-    curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | sudo apt-key add -                             &&\
-    echo "deb https://dl.yarnpkg.com/debian/ stable main" | sudo tee /etc/apt/sources.list.d/yarn.list &&\
-    apt-get update                                                                                     &&\
     apt-get install -y --no-install-recommends \
-        nodejs                                 \
-        yarn                                   \
         supervisor                             \
         libzmq5                                \
         nginx                                  \
@@ -18,13 +14,18 @@ RUN curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
 COPY requirements.txt /tmp
 RUN pip3 install -r /tmp/requirements.txt
 
+RUN curl -Ls https://github.com/krallin/tini/releases/download/v0.18.0/tini-amd64 --output /bin/init &&\
+    echo "12d20136605531b09a2c2dac02ccee85e1b874eb322ef6baf7561cd93f93c855 /bin/init"                 |\
+    sha256sum --check --status                                                                       &&\
+    chmod 755 /bin/init
+
 ENV TFW_PUBLIC_PORT=8888          \
     TFW_WEB_PORT=4242             \
     TFW_LOGIN_APP_PORT=6666       \
     TFW_TERMINADO_PORT=7878       \
     TFW_SUPERVISOR_HTTP_PORT=9001 \
-    TFW_PUBLISHER_PORT=7654       \
+    TFW_PUB_PORT=7654             \
-    TFW_RECEIVER_PORT=8765
+    TFW_PULL_PORT=8765
 
 EXPOSE ${TFW_PUBLIC_PORT}
 
@@ -39,29 +40,26 @@ ENV PYTHONPATH="/usr/local/lib"                                            \
     TFW_FRONTEND_DIR="/srv/frontend"                                       \
     TFW_DIR="/.tfw"                                                        \
     TFW_SERVER_DIR="/.tfw/tfw_server"                                      \
-    TFW_SNAPSHOTS_DIR="/.tfw/snapshots"                                    \
     TFW_AUTH_KEY="/tmp/tfw-auth.key"                                       \
+    TFW_LOGS_DIR="/var/log/tfw"                                            \
+    TFW_PIPES_DIR="/run/tfw"                                               \
+    TFW_SNAPSHOTS_DIR="/tmp/tfw-snapshots"                                 \
     TFW_HISTFILE="/home/${AVATAO_USER}/.bash_history"                      \
     PROMPT_COMMAND="history -a"
 
-COPY bashrc /tmp
+COPY bashrc supervisor/tfw_init.sh /tmp/
-RUN echo "export HISTFILE=${TFW_HISTFILE}" >> /tmp/bashrc &&\
-    cat /tmp/bashrc >> /home/${AVATAO_USER}/.bashrc
-
 COPY supervisor/supervisord.conf ${TFW_SUPERVISORD_CONF}
 COPY supervisor/components/ ${TFW_SUPERVISORD_COMPONENTS}
 COPY nginx/nginx.conf ${TFW_NGINX_CONF}
 COPY nginx/default.conf ${TFW_NGINX_DEFAULT}
 COPY nginx/components/ ${TFW_NGINX_COMPONENTS}
-COPY lib LICENSE ${TFW_LIB_DIR}/
+COPY tfw ${TFW_LIB_DIR}/tfw
 COPY supervisor/tfw_server.py ${TFW_SERVER_DIR}/
+COPY --from=frontend /srv/dist ${TFW_FRONTEND_DIR}
 
-RUN for dir in "${TFW_LIB_DIR}"/{tfw,tao,envvars} "/etc/nginx" "/etc/supervisor"; do \
+VOLUME ["${TFW_LOGS_DIR}", "${TFW_PIPES_DIR}"]
-        chown -R root:root "$dir" && chmod -R 700 "$dir";                            \
-    done
 
 ONBUILD ARG BUILD_CONTEXT="solvable"
-ONBUILD ARG NOFRONTEND=""
 
 ONBUILD COPY ${BUILD_CONTEXT}/nginx/ ${TFW_NGINX_COMPONENTS}
 ONBUILD COPY ${BUILD_CONTEXT}/supervisor/ ${TFW_SUPERVISORD_COMPONENTS}
@@ -69,11 +67,7 @@ ONBUILD COPY ${BUILD_CONTEXT}/supervisor/ ${TFW_SUPERVISORD_COMPONENTS}
 ONBUILD RUN for f in "${TFW_NGINX_DEFAULT}" ${TFW_NGINX_COMPONENTS}/*.conf; do                               \
                 envsubst "$(printenv | cut -d= -f1 | grep TFW_ | sed -e 's/^/$/g')" < $f > $f~ && mv $f~ $f ;\
             done
-ONBUILD VOLUME ["/etc/nginx", "/var/lib/nginx", "/var/log/nginx", "${TFW_LIB_DIR}/envvars", "${TFW_LIB_DIR}/tfw"]
+ONBUILD VOLUME ["/etc/nginx", "/var/lib/nginx", "/var/log/nginx", "${TFW_LIB_DIR}/tfw"]
-
-ONBUILD COPY ${BUILD_CONTEXT}/frontend /data/
-ONBUILD RUN test -z "${NOFRONTEND}" && cd /data && yarn install --frozen-lockfile || :
-ONBUILD RUN test -z "${NOFRONTEND}" && cd /data && yarn build --no-progress || :
-ONBUILD RUN test -z "${NOFRONTEND}" && mv /data/dist ${TFW_FRONTEND_DIR} && rm -rf /data || :
 
+ENTRYPOINT ["/bin/init", "--"]
 CMD exec supervisord --nodaemon --configuration ${TFW_SUPERVISORD_CONF}

LICENSE

@@ -1,12 +0,0 @@
-AVATAO CONFIDENTIAL
-
-Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-All Rights Reserved.
-
-All source code, configuration files and documentation contained herein
-is, and remains the exclusive property of Avatao.com Innovative Learning Kft.
-The intellectual and technical concepts contained herein are proprietary 
-to Avatao.com Innovative Learning Kft. and are protected by trade secret
-or copyright law. Dissemination of this information or reproduction of
-this material is strictly forbidden unless prior written permission is
-obtained from Avatao.com Innovative Learning Kft.

VERSION

@@ -1 +1 @@
-ocicat
+chausie

lib/tao/__init__.py

@@ -1,2 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.

lib/tao/config/__init__.py

@@ -1,4 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from .envvars import TAOENV

lib/tao/config/envvars.py

@@ -1,6 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from envvars import LazyEnvironment
-
-TAOENV = LazyEnvironment('AVATAO_', 'taoenvtuple').environment

lib/tfw/__init__.py

@@ -1,2 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.

lib/tfw/components/__init__.py

@@ -1,16 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from .directory_monitoring_event_handler import DirectoryMonitoringEventHandler
-from .process_managing_event_handler import ProcessManagingEventHandler
-from .terminal_event_handler import TerminalEventHandler
-from .ide_event_handler import IdeEventHandler
-from .history_monitor import HistoryMonitor, BashMonitor, GDBMonitor
-from .terminal_commands import TerminalCommands
-from .log_monitoring_event_handler import LogMonitoringEventHandler
-from .fsm_managing_event_handler import FSMManagingEventHandler
-from .snapshot_provider import SnapshotProvider
-from .pipe_io_event_handler import PipeIOEventHandlerBase, PipeIOEventHandler, PipeIOServer
-from .pipe_io_event_handler import TransformerPipeIOEventHandler, CommandEventHandler
-from .directory_snapshotting_event_handler import DirectorySnapshottingEventHandler
-from .commands_equal import CommandsEqual

lib/tfw/components/directory_monitor.py

@@ -1,81 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from functools import wraps
-
-from watchdog.events import FileSystemEventHandler as FileSystemWatchdogEventHandler
-
-from tfw.networking.event_handlers.server_connector import ServerUplinkConnector
-from tfw.decorators.rate_limiter import RateLimiter
-from tfw.mixins.observer_mixin import ObserverMixin
-
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class DirectoryMonitor(ObserverMixin):
-    def __init__(self, ide_key, directories):
-        self.eventhandler = IdeReloadWatchdogEventHandler(ide_key)
-        for directory in directories:
-            self.observer.schedule(self.eventhandler, directory, recursive=True)
-
-        self.pause, self.resume = self.eventhandler.pause, self.eventhandler.resume
-
-    @property
-    def ignore(self):
-        return self.eventhandler.ignore
-
-    @ignore.setter
-    def ignore(self, value):
-        self.eventhandler.ignore = value if value >= 0 else 0
-
-    @property
-    def pauser(self):
-        return DirectoryMonitor.Pauser(self)
-
-    class Pauser:
-        def __init__(self, directory_monitor):
-            self.directorymonitor = directory_monitor
-        def __enter__(self):
-            self.directorymonitor.pause()
-        def __exit__(self, exc_type, exc_val, exc_tb):
-            self.directorymonitor.resume()
-
-
-class IdeReloadWatchdogEventHandler(FileSystemWatchdogEventHandler):
-    def __init__(self, ide_key):
-        super().__init__()
-        self.ide_key = ide_key
-        self.uplink = ServerUplinkConnector()
-        self._paused = False
-        self.ignore = 0
-
-    def pause(self):
-        self._paused = True
-
-    def resume(self):
-        self._paused = False
-
-    @RateLimiter(rate_per_second=2)
-    def on_modified(self, event):
-        if self._paused:
-            return
-        if self.ignore > 0:
-            self.ignore = self.ignore - 1
-            return
-        LOG.debug(event)
-        self.uplink.send({
-            'key': self.ide_key,
-            'data': {'command': 'reload'}
-        })
-
-
-def with_monitor_paused(fun):
-    @wraps(fun)
-    def wrapper(self, *args, **kwargs):
-        if self.monitor:
-            with self.monitor.pauser:
-                return fun(self, *args, **kwargs)
-        return fun(self, *args, **kwargs)
-    return wrapper

lib/tfw/components/directory_monitoring_event_handler.py

@@ -1,70 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from os.path import isdir, exists
-
-from tfw.event_handler_base import EventHandlerBase
-from tfw.mixins.monitor_manager_mixin import MonitorManagerMixin
-from tfw.components.directory_monitor import DirectoryMonitor
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class DirectoryMonitoringEventHandler(EventHandlerBase, MonitorManagerMixin):
-    def __init__(self, key, directory):
-        super().__init__(key)
-        self._directory = directory
-        MonitorManagerMixin.__init__(
-            self,
-            DirectoryMonitor,
-            key,
-            self._directory
-        )
-
-        self.commands = {
-            'pause':     self.pause,
-            'resume':    self.resume,
-            'ignore':    self.ignore,
-            'selectdir': self.selectdir
-        }
-
-    @property
-    def directory(self):
-        return self._directory
-
-    @directory.setter
-    def directory(self, directory):
-        if not exists(directory) or not isdir(directory):
-            raise EnvironmentError('No such directory!')
-        self._directory = directory
-
-    def handle_event(self, message):
-        try:
-            message['data'] = self.commands[message['data']['command']](message['data'])
-            return message
-        except KeyError:
-            LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
-
-    def pause(self, data):
-        self.monitor.pause()
-        return data
-
-    def resume(self, data):
-        self.monitor.resume()
-        return data
-
-    def ignore(self, data):
-        self.monitor.ignore += data['ignore']
-        return data
-
-    def selectdir(self, data):
-        try:
-            self.directory = data['directory']
-            self.reload_monitor()
-            return data
-        except EnvironmentError:
-            LOG.error('Failed to switch directory!')
-
-    def cleanup(self):
-        self.monitor.stop()

lib/tfw/components/fsm_managing_event_handler.py

@@ -1,98 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from tfw.event_handler_base import EventHandlerBase
-from tfw.crypto import KeyManager, sign_message, verify_message
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class FSMManagingEventHandler(EventHandlerBase):
-    """
-    EventHandler responsible for managing the state machine of
-    the framework (TFW FSM).
-
-    tfw.networking.TFWServer instances automatically send 'trigger'
-    commands to the event handler listening on the 'fsm' key,
-    which should be an instance of this event handler.
-
-    This event handler accepts messages that have a
-    data['command'] key specifying a command to be executed.
-
-    An 'fsm_update' message is broadcasted after every successful
-    command.
-    """
-    def __init__(self, key, fsm_type, require_signature=False):
-        super().__init__(key)
-        self.fsm = fsm_type()
-        self._fsm_updater = FSMUpdater(self.fsm)
-        self.auth_key = KeyManager().auth_key
-        self._require_signature = require_signature
-
-        self.command_handlers = {
-            'trigger': self.handle_trigger,
-            'update':  self.handle_update
-        }
-
-    def handle_event(self, message):
-        try:
-            message = self.command_handlers[message['data']['command']](message)
-            if message:
-                fsm_update_message = self._fsm_updater.fsm_update
-                sign_message(self.auth_key, message)
-                sign_message(self.auth_key, fsm_update_message)
-                self.server_connector.broadcast(fsm_update_message)
-            return message
-        except KeyError:
-            LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
-
-    def handle_trigger(self, message):
-        """
-        Attempts to step the FSM with the supplied trigger.
-
-        :param message: TFW message with a data field containing
-                        the action to try triggering in data['value']
-        """
-        trigger = message['data']['value']
-        if self._require_signature:
-            if not verify_message(self.auth_key, message):
-                LOG.error('Ignoring unsigned trigger command: %s', message)
-                return None
-        if self.fsm.step(trigger):
-            return message
-        return None
-
-    def handle_update(self, message):
-        """
-        Does nothing, but triggers an 'fsm_update' message.
-        """
-        # pylint: disable=no-self-use
-        return message
-
-
-class FSMUpdater:
-    def __init__(self, fsm):
-        self.fsm = fsm
-
-    @property
-    def fsm_update(self):
-        return {
-            'key': 'fsm_update',
-            'data': self.fsm_update_data
-        }
-
-    @property
-    def fsm_update_data(self):
-        valid_transitions = [
-            {'trigger': trigger}
-            for trigger in self.fsm.get_triggers(self.fsm.state)
-        ]
-        last_fsm_event = self.fsm.event_log[-1]
-        last_fsm_event['timestamp'] = last_fsm_event['timestamp'].isoformat()
-        return {
-            'current_state': self.fsm.state,
-            'valid_transitions': valid_transitions,
-            'in_accepted_state': self.fsm.in_accepted_state,
-            'last_event': last_fsm_event
-        }

lib/tfw/components/ide_event_handler.py

@@ -1,255 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from os.path import isfile, join, relpath, exists, isdir, realpath
-from glob import glob
-from fnmatch import fnmatchcase
-from typing import Iterable
-
-from tfw.event_handler_base import EventHandlerBase
-from tfw.mixins.monitor_manager_mixin import MonitorManagerMixin
-from tfw.components.directory_monitor import DirectoryMonitor
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class FileManager:  # pylint: disable=too-many-instance-attributes
-    def __init__(self, working_directory, allowed_directories, selected_file=None, exclude=None):
-        self._exclude, self.exclude = None, exclude
-        self._allowed_directories, self.allowed_directories = None, allowed_directories
-        self._workdir, self.workdir = None, working_directory
-        self._filename, self.filename = None, selected_file or self.files[0]
-
-    @property
-    def exclude(self):
-        return self._exclude
-
-    @exclude.setter
-    def exclude(self, exclude):
-        if exclude is None:
-            return
-        if not isinstance(exclude, Iterable):
-            raise TypeError('Exclude must be Iterable!')
-        self._exclude = exclude
-
-    @property
-    def workdir(self):
-        return self._workdir
-
-    @workdir.setter
-    def workdir(self, directory):
-        if not exists(directory) or not isdir(directory):
-            raise EnvironmentError(f'"{directory}" is not a directory!')
-        if not self._is_in_allowed_dir(directory):
-            raise EnvironmentError(f'Directory "{directory}" is not allowed!')
-        self._workdir = directory
-
-    @property
-    def allowed_directories(self):
-        return self._allowed_directories
-
-    @allowed_directories.setter
-    def allowed_directories(self, directories):
-        self._allowed_directories = directories
-
-    @property
-    def filename(self):
-        return self._filename
-
-    @filename.setter
-    def filename(self, filename):
-        if filename not in self.files:
-            raise EnvironmentError('No such file in workdir!')
-        self._filename = filename
-
-    @property
-    def files(self):
-        return [
-            self._relpath(file)
-            for file in glob(join(self._workdir, '**/*'), recursive=True)
-            if isfile(file)
-            and self._is_in_allowed_dir(file)
-            and not self._is_blacklisted(file)
-        ]
-
-    @property
-    def file_contents(self):
-        with open(self._filepath(self.filename), 'r', errors='surrogateescape') as ifile:
-            return ifile.read()
-
-    @file_contents.setter
-    def file_contents(self, value):
-        with open(self._filepath(self.filename), 'w', errors='surrogateescape') as ofile:
-            ofile.write(value)
-
-    def _is_in_allowed_dir(self, path):
-        return any(
-            realpath(path).startswith(allowed_dir)
-            for allowed_dir in self.allowed_directories
-        )
-
-    def _is_blacklisted(self, file):
-        return any(
-            fnmatchcase(file, blacklisted)
-            for blacklisted in self.exclude
-        )
-
-    def _filepath(self, filename):
-        return join(self._workdir, filename)
-
-    def _relpath(self, filename):
-        return relpath(self._filepath(filename), start=self._workdir)
-
-
-class IdeEventHandler(EventHandlerBase, MonitorManagerMixin):
-    # pylint: disable=too-many-arguments,anomalous-backslash-in-string
-    """
-    Event handler implementing the backend of our browser based IDE.
-    By default all files in the directory specified in __init__ are displayed
-    on the fontend. Note that this is a stateful component.
-
-    When any file in the selected directory changes they are automatically refreshed
-    on the frontend (this is done by listening to inotify events).
-
-    This EventHandler accepts messages that have a data['command'] key specifying
-    a command to be executed.
-
-    The API of each command is documented in their respective handler.
-    """
-    def __init__(self, key, directory, allowed_directories, selected_file=None, exclude=None):
-        """
-        :param key: the key this instance should listen to
-        :param directory: working directory which the EventHandler should serve files from
-        :param allowed_directories: list of directories that can be switched to using selectdir
-        :param selected_file: file that is selected by default
-        :param exclude: list of filenames that should not appear between files (for .o, .pyc, etc.)
-        """
-        super().__init__(key)
-        try:
-            self.filemanager = FileManager(
-                allowed_directories=allowed_directories,
-                working_directory=directory,
-                selected_file=selected_file,
-                exclude=exclude
-            )
-        except IndexError:
-            raise EnvironmentError(
-                f'No file(s) in IdeEventHandler working_directory "{directory}"!'
-            )
-
-        MonitorManagerMixin.__init__(
-            self,
-            DirectoryMonitor,
-            self.key,
-            self.filemanager.allowed_directories
-        )
-
-        self.commands = {
-            'read':      self.read,
-            'write':     self.write,
-            'select':    self.select,
-            'selectdir': self.select_dir,
-            'exclude':   self.exclude
-        }
-
-    def read(self, data):
-        """
-        Read the currently selected file.
-
-        :return dict: TFW message data containing key 'content'
-                      (contents of the selected file)
-        """
-        try:
-            data['content'] = self.filemanager.file_contents
-        except PermissionError:
-            data['content'] = 'You have no permission to open that file :('
-        except FileNotFoundError:
-            data['content'] = 'This file was removed :('
-        except Exception: # pylint: disable=broad-except
-            data['content'] = 'Failed to read file :('
-        return data
-
-    def write(self, data):
-        """
-        Overwrites a file with the desired string.
-
-        :param data: TFW message data containing key 'content'
-                     (new file content)
-
-        """
-        self.monitor.ignore = self.monitor.ignore + 1
-        try:
-            self.filemanager.file_contents = data['content']
-        except Exception: # pylint: disable=broad-except
-            LOG.exception('Error writing file!')
-        del data['content']
-        return data
-
-    def select(self, data):
-        """
-        Selects a file from the current directory.
-
-        :param data: TFW message data containing 'filename'
-                     (name of file to select relative to the current directory)
-        """
-        try:
-            self.filemanager.filename = data['filename']
-        except EnvironmentError:
-            LOG.exception('Failed to select file "%s"', data['filename'])
-        return data
-
-    def select_dir(self, data):
-        """
-        Select a new working directory to display files from.
-
-        :param data: TFW message data containing 'directory'
-                     (absolute path of diretory to select.
-                     must be a path whitelisted in
-                     self.allowed_directories)
-        """
-        try:
-            self.filemanager.workdir = data['directory']
-            self.reload_monitor()
-            try:
-                self.filemanager.filename = self.filemanager.files[0]
-                self.read(data)
-            except IndexError:
-                data['content'] = 'No files in this directory :('
-        except EnvironmentError as err:
-            LOG.error('Failed to select directory "%s". Reason: %s', data['directory'], str(err))
-        return data
-
-    def exclude(self, data):
-        """
-        Overwrite list of excluded files
-
-        :param data: TFW message data containing 'exclude'
-                     (list of unix-style filename patterns to be excluded,
-                     e.g.: ["\*.pyc", "\*.o")
-        """
-        try:
-            self.filemanager.exclude = list(data['exclude'])
-        except TypeError:
-            LOG.error('Exclude must be Iterable!')
-        return data
-
-    def attach_fileinfo(self, data):
-        """
-        Basic information included in every response to the frontend.
-        """
-        data['filename'] = self.filemanager.filename
-        data['files'] = self.filemanager.files
-        data['directory'] = self.filemanager.workdir
-
-    def handle_event(self, message):
-        try:
-            data = message['data']
-            message['data'] = self.commands[data['command']](data)
-            self.attach_fileinfo(data)
-            return message
-        except KeyError:
-            LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
-
-    def cleanup(self):
-        self.monitor.stop()

lib/tfw/components/log_monitor.py

@@ -1,57 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-import logging
-from os.path import dirname
-
-from watchdog.events import PatternMatchingEventHandler as PatternMatchingWatchdogEventHandler
-
-from tfw.networking.event_handlers.server_connector import ServerUplinkConnector
-from tfw.decorators.rate_limiter import RateLimiter
-from tfw.mixins.observer_mixin import ObserverMixin
-from tfw.mixins.supervisor_mixin import SupervisorLogMixin
-
-
-class LogMonitor(ObserverMixin):
-    def __init__(self, process_name, log_tail=0):
-        self.prevent_log_recursion()
-        event_handler = SendLogWatchdogEventHandler(
-            process_name,
-            log_tail=log_tail
-        )
-        self.observer.schedule(
-            event_handler,
-            event_handler.path
-        )
-
-    @staticmethod
-    def prevent_log_recursion():
-        # This is done to prevent inotify event logs triggering themselves (infinite log recursion)
-        logging.getLogger('watchdog.observers.inotify_buffer').propagate = False
-
-
-class SendLogWatchdogEventHandler(PatternMatchingWatchdogEventHandler, SupervisorLogMixin):
-    def __init__(self, process_name, log_tail=0):
-        self.process_name = process_name
-        self.procinfo = self.supervisor.getProcessInfo(self.process_name)
-        super().__init__([
-            self.procinfo['stdout_logfile'],
-            self.procinfo['stderr_logfile']
-        ])
-        self.uplink = ServerUplinkConnector()
-        self.log_tail = log_tail
-
-    @property
-    def path(self):
-        return dirname(self.procinfo['stdout_logfile'])
-
-    @RateLimiter(rate_per_second=5)
-    def on_modified(self, event):
-        self.uplink.send({
-            'key': 'processlog',
-            'data': {
-                'command': 'new_log',
-                'stdout': self.read_stdout(self.process_name, tail=self.log_tail),
-                'stderr': self.read_stderr(self.process_name, tail=self.log_tail)
-            }
-        })

lib/tfw/components/log_monitoring_event_handler.py

@@ -1,67 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from tfw.event_handler_base import EventHandlerBase
-from tfw.mixins.monitor_manager_mixin import MonitorManagerMixin
-from tfw.components.log_monitor import LogMonitor
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class LogMonitoringEventHandler(EventHandlerBase, MonitorManagerMixin):
-    """
-    Monitors the output of a supervisor process (stdout, stderr) and
-    sends the results to the frontend.
-
-    Accepts messages that have a data['command'] key specifying
-    a command to be executed.
-
-    The API of each command is documented in their respective handler.
-    """
-    def __init__(self, key, process_name, log_tail=0):
-        super().__init__(key)
-        self.process_name = process_name
-        self.log_tail = log_tail
-        MonitorManagerMixin.__init__(
-            self,
-            LogMonitor,
-            self.process_name,
-            self.log_tail
-        )
-
-        self.command_handlers = {
-            'process_name': self.handle_process_name,
-            'log_tail':     self.handle_log_tail
-        }
-
-    def handle_event(self, message):
-        try:
-            data = message['data']
-            self.command_handlers[data['command']](data)
-            self.reload_monitor()
-        except KeyError:
-            LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
-
-    def handle_process_name(self, data):
-        """
-        Changes the monitored process.
-
-        :param data: TFW message data containing 'value'
-                     (name of the process to monitor)
-        """
-        self.set_monitor_args(data['value'], self.log_tail)
-
-    def handle_log_tail(self, data):
-        """
-        Sets tail length of the log the monitor will send
-        to the frontend (the monitor will send back the last
-        'value' characters of the log).
-
-        :param data: TFW message data containing 'value'
-                     (new tail length)
-        """
-        self.set_monitor_args(self.process_name, data['value'])
-
-    def cleanup(self):
-        self.monitor.stop()

lib/tfw/components/pipe_io_event_handler.py

@@ -1,143 +0,0 @@
-from abc import abstractmethod
-from json import loads, dumps
-from subprocess import run, PIPE, Popen
-from functools import partial
-from os import getpgid, killpg
-from os.path import join
-from signal import SIGTERM
-from secrets import token_urlsafe
-from threading import Thread
-from contextlib import suppress
-
-from tfw.event_handler_base import EventHandlerBase
-from tfw.config.logs import logging
-
-from .pipe_io_server import PipeIOServer, terminate_process_on_failure
-
-LOG = logging.getLogger(__name__)
-DEFAULT_PERMISSIONS = 0o600
-
-
-class PipeIOEventHandlerBase(EventHandlerBase):
-    def __init__(self, key, in_pipe_path, out_pipe_path, permissions=DEFAULT_PERMISSIONS):
-        super().__init__(key)
-        self.pipe_io = CallbackPipeIOServer(
-            in_pipe_path,
-            out_pipe_path,
-            self.handle_pipe_event,
-            permissions
-        )
-        self.pipe_io.start()
-
-    @abstractmethod
-    def handle_pipe_event(self, message_bytes):
-        raise NotImplementedError()
-
-    def cleanup(self):
-        self.pipe_io.stop()
-
-
-class CallbackPipeIOServer(PipeIOServer):
-    def __init__(self, in_pipe_path, out_pipe_path, callback, permissions):
-        super().__init__(in_pipe_path, out_pipe_path, permissions)
-        self.callback = callback
-
-    def handle_message(self, message):
-        try:
-            self.callback(message)
-        except:  # pylint: disable=bare-except
-            LOG.exception('Failed to handle message %s from pipe %s!', message, self.in_pipe)
-
-
-class PipeIOEventHandler(PipeIOEventHandlerBase):
-    def handle_event(self, message):
-        json_bytes = dumps(message).encode()
-        self.pipe_io.send_message(json_bytes)
-
-    def handle_pipe_event(self, message_bytes):
-        json = loads(message_bytes)
-        self.server_connector.send(json)
-
-
-class TransformerPipeIOEventHandler(PipeIOEventHandlerBase):
-    # pylint: disable=too-many-arguments
-    def __init__(
-            self, key, in_pipe_path, out_pipe_path,
-            transform_in_cmd, transform_out_cmd,
-            permissions=DEFAULT_PERMISSIONS
-    ):
-        self._transform_in = partial(self._transform_message, transform_in_cmd)
-        self._transform_out = partial(self._transform_message, transform_out_cmd)
-        super().__init__(key, in_pipe_path, out_pipe_path, permissions)
-
-    @staticmethod
-    def _transform_message(transform_cmd, message):
-        proc = run(
-            transform_cmd,
-            input=message,
-            stdout=PIPE,
-            stderr=PIPE,
-            shell=True
-        )
-        if proc.returncode == 0:
-            return proc.stdout
-        raise ValueError(f'Transforming message {message} failed!')
-
-    def handle_event(self, message):
-        json_bytes = dumps(message).encode()
-        transformed_bytes = self._transform_out(json_bytes)
-        if transformed_bytes:
-            self.pipe_io.send_message(transformed_bytes)
-
-    def handle_pipe_event(self, message_bytes):
-        transformed_bytes = self._transform_in(message_bytes)
-        if transformed_bytes:
-            json_message = loads(transformed_bytes)
-            self.server_connector.send(json_message)
-
-
-class CommandEventHandler(PipeIOEventHandler):
-    def __init__(self, key, command, permissions=DEFAULT_PERMISSIONS):
-        super().__init__(
-            key,
-            self._generate_tempfilename(),
-            self._generate_tempfilename(),
-            permissions
-        )
-
-        self._proc_stdin = open(self.pipe_io.out_pipe, 'rb')
-        self._proc_stdout = open(self.pipe_io.in_pipe, 'wb')
-        self._proc = Popen(
-            command, shell=True, executable='/bin/bash',
-            stdin=self._proc_stdin, stdout=self._proc_stdout, stderr=PIPE,
-            start_new_session=True
-        )
-        self._monitor_proc_thread = self._start_monitor_proc()
-
-    def _generate_tempfilename(self):
-        # pylint: disable=no-self-use
-        random_filename = partial(token_urlsafe, 10)
-        return join('/tmp', f'{type(self).__name__}.{random_filename()}')
-
-    def _start_monitor_proc(self):
-        thread = Thread(target=self._monitor_proc, daemon=True)
-        thread.start()
-        return thread
-
-    @terminate_process_on_failure
-    def _monitor_proc(self):
-        return_code = self._proc.wait()
-        if return_code == -int(SIGTERM):
-            # supervisord asked the program to terminate, this is fine
-            return
-        if return_code != 0:
-            _, stderr = self._proc.communicate()
-            raise RuntimeError(f'Subprocess failed ({return_code})! Stderr:\n{stderr.decode()}')
-
-    def cleanup(self):
-        with suppress(ProcessLookupError):
-            process_group_id = getpgid(self._proc.pid)
-            killpg(process_group_id, SIGTERM)
-            self._proc_stdin.close()
-            self._proc_stdout.close()
-        super().cleanup()

lib/tfw/components/pipe_io_server/__init__.py

@@ -1,2 +0,0 @@
-from .pipe_io_server import PipeIOServer
-from .terminate_process_on_failure import terminate_process_on_failure

lib/tfw/components/pipe_io_server/deque.py

@@ -1,27 +0,0 @@
-from collections import deque
-from threading import Lock, Condition
-
-
-class Deque:
-    def __init__(self):
-        self._queue = deque()
-
-        self._mutex = Lock()
-        self._not_empty = Condition(self._mutex)
-
-    def pop(self):
-        with self._mutex:
-            while not self._queue:
-                self._not_empty.wait()
-            return self._queue.pop()
-
-    def push(self, item):
-        self._push(item, self._queue.appendleft)
-
-    def push_front(self, item):
-        self._push(item, self._queue.append)
-
-    def _push(self, item, put_method):
-        with self._mutex:
-            put_method(item)
-            self._not_empty.notify()

lib/tfw/components/pipe_io_server/pipe.py

@@ -1,16 +0,0 @@
-from os import mkfifo, remove, chmod
-from os.path import exists
-
-
-class Pipe:
-    def __init__(self, path):
-        self.path = path
-
-    def recreate(self, permissions):
-        self.remove()
-        mkfifo(self.path)
-        chmod(self.path, permissions)  # use chmod to ignore umask
-
-    def remove(self):
-        if exists(self.path):
-            remove(self.path)

lib/tfw/components/pipe_io_server/pipe_io_server.py

@@ -1,73 +0,0 @@
-from abc import ABC, abstractmethod
-from threading import Thread, Event
-from typing import Callable
-
-from .pipe_reader_thread import PipeReaderThread
-from .pipe_writer_thread import PipeWriterThread
-from .pipe import Pipe
-from .terminate_process_on_failure import terminate_process_on_failure
-
-
-class PipeIOServer(ABC, Thread):
-    def __init__(self, in_pipe=None, out_pipe=None, permissions=0o600):
-        super().__init__(daemon=True)
-        self._in_pipe, self._out_pipe = in_pipe, out_pipe
-        self._create_pipes(permissions)
-        self._stop_event = Event()
-        self._reader_thread, self._writer_thread = self._create_io_threads()
-        self._io_threads = (self._reader_thread, self._writer_thread)
-        self._on_stop = lambda: None
-
-    def _create_pipes(self, permissions):
-        Pipe(self.in_pipe).recreate(permissions)
-        Pipe(self.out_pipe).recreate(permissions)
-
-    @property
-    def in_pipe(self):
-        return self._in_pipe
-
-    @property
-    def out_pipe(self):
-        return self._out_pipe
-
-    def _create_io_threads(self):
-        reader_thread = PipeReaderThread(self.in_pipe, self._stop_event, self.handle_message)
-        writer_thread = PipeWriterThread(self.out_pipe, self._stop_event)
-        return reader_thread, writer_thread
-
-    @abstractmethod
-    def handle_message(self, message):
-        raise NotImplementedError()
-
-    def send_message(self, message):
-        self._writer_thread.write(message)
-
-    @terminate_process_on_failure
-    def run(self):
-        for thread in self._io_threads:
-            thread.start()
-        self._stop_event.wait()
-        self._stop_threads()
-
-    def stop(self):
-        self._stop_event.set()
-        if self.is_alive():
-            self.join()
-
-    def _stop_threads(self):
-        for thread in self._io_threads:
-            if thread.is_alive():
-                thread.stop()
-        Pipe(self.in_pipe).remove()
-        Pipe(self.out_pipe).remove()
-        self._on_stop()
-
-    def _set_on_stop(self, value):
-        if not isinstance(value, Callable):
-            raise ValueError("Supplied object is not callable!")
-        self._on_stop = value
-
-    on_stop = property(fset=_set_on_stop)
-
-    def wait(self):
-        self._stop_event.wait()

lib/tfw/components/pipe_io_server/pipe_reader_thread.py

@@ -1,44 +0,0 @@
-from contextlib import suppress
-from os import open as osopen
-from os import write, close, O_WRONLY, O_NONBLOCK
-from threading import Thread
-
-from .terminate_process_on_failure import terminate_process_on_failure
-
-
-class PipeReaderThread(Thread):
-    eof = b''
-    stop_sequence = b'stop_reading\n'
-
-    def __init__(self, pipe_path, stop_event, message_handler):
-        super().__init__(daemon=True)
-        self._message_handler = message_handler
-        self._pipe_path = pipe_path
-        self._stop_event = stop_event
-
-    @terminate_process_on_failure
-    def run(self):
-        with self._open() as pipe:
-            while True:
-                message = pipe.readline()
-                if message == self.stop_sequence:
-                    self._stop_event.set()
-                    break
-                if message == self.eof:
-                    self._open().close()
-                    continue
-                self._message_handler(message[:-1])
-
-    def _open(self):
-        return open(self._pipe_path, 'rb')
-
-    def stop(self):
-        while self.is_alive():
-            self._unblock()
-        self.join()
-
-    def _unblock(self):
-        with suppress(OSError):
-            fd = osopen(self._pipe_path, O_WRONLY | O_NONBLOCK)
-            write(fd, self.stop_sequence)
-            close(fd)

lib/tfw/components/pipe_io_server/pipe_writer_thread.py

@@ -1,50 +0,0 @@
-from contextlib import suppress
-from os import O_NONBLOCK, O_RDONLY, close
-from os import open as osopen
-from threading import Thread
-
-from .terminate_process_on_failure import terminate_process_on_failure
-from .deque import Deque
-
-
-class PipeWriterThread(Thread):
-    def __init__(self, pipe_path, stop_event):
-        super().__init__(daemon=True)
-        self._pipe_path = pipe_path
-        self._stop_event = stop_event
-        self._write_queue = Deque()
-
-    def write(self, message):
-        self._write_queue.push(message)
-
-    @terminate_process_on_failure
-    def run(self):
-        with self._open() as pipe:
-            while True:
-                message = self._write_queue.pop()
-                if message is None:
-                    self._stop_event.set()
-                    break
-                try:
-                    pipe.write(message + b'\n')
-                    pipe.flush()
-                except BrokenPipeError:
-                    try:  # pipe was reopened, close() flushed the message
-                        pipe.close()
-                    except BrokenPipeError:  # close() discarded the message
-                        self._write_queue.push_front(message)
-                    pipe = self._open()
-
-    def _open(self):
-        return open(self._pipe_path, 'wb')
-
-    def stop(self):
-        while self.is_alive():
-            self._unblock()
-        self.join()
-
-    def _unblock(self):
-        with suppress(OSError):
-            fd = osopen(self._pipe_path, O_RDONLY | O_NONBLOCK)
-            self._write_queue.push_front(None)
-            close(fd)

lib/tfw/components/pipe_io_server/terminate_process_on_failure.py

@@ -1,15 +0,0 @@
-from functools import wraps
-from os import kill, getpid
-from signal import SIGTERM
-from traceback import print_exc
-
-
-def terminate_process_on_failure(fun):
-    @wraps(fun)
-    def wrapper(*args, **kwargs):
-        try:
-            return fun(*args, **kwargs)
-        except:  # pylint: disable=bare-except
-            print_exc()
-            kill(getpid(), SIGTERM)
-    return wrapper

lib/tfw/components/process_managing_event_handler.py

@@ -1,64 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from xmlrpc.client import Fault as SupervisorFault
-
-from tfw.event_handler_base import EventHandlerBase
-from tfw.mixins.supervisor_mixin import SupervisorMixin, SupervisorLogMixin
-from tfw.components.directory_monitor import with_monitor_paused
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class ProcessManager(SupervisorMixin, SupervisorLogMixin):
-    def __init__(self):
-        self.commands = {
-            'start':   self.start_process,
-            'stop':    self.stop_process,
-            'restart': self.restart_process
-        }
-
-    def __call__(self, command, process_name):
-        return self.commands[command](process_name)
-
-
-class ProcessManagingEventHandler(EventHandlerBase):
-    """
-    Event handler that can manage processes managed by supervisor.
-
-    This EventHandler accepts messages that have a data['command'] key specifying
-    a command to be executed.
-    Every message must contain a data['process_name'] field with the name of the
-    process to manage. This is the name specified in supervisor config files like so:
-    [program:someprogram]
-
-    Commands available: start, stop, restart, readlog
-    (the names are as self-documenting as it gets)
-    """
-    def __init__(self, key, dirmonitor=None, log_tail=0):
-        super().__init__(key)
-        self.monitor = dirmonitor
-        self.processmanager = ProcessManager()
-        self.log_tail = log_tail
-
-    @with_monitor_paused
-    def handle_event(self, message):
-        try:
-            data = message['data']
-            try:
-                self.processmanager(data['command'], data['process_name'])
-            except SupervisorFault as fault:
-                message['data']['error'] = fault.faultString
-            finally:
-                message['data']['stdout'] = self.processmanager.read_stdout(
-                    data['process_name'],
-                    self.log_tail
-                )
-                message['data']['stderr'] = self.processmanager.read_stderr(
-                    data['process_name'],
-                    self.log_tail
-                )
-            return message
-        except KeyError:
-            LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)

lib/tfw/components/terminal_event_handler.py

@@ -1,87 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from tfw.event_handler_base import EventHandlerBase
-from tfw.components.terminado_mini_server import TerminadoMiniServer
-from tfw.config import TFWENV
-from tfw.config.logs import logging
-from tao.config import TAOENV
-
-LOG = logging.getLogger(__name__)
-
-
-class TerminalEventHandler(EventHandlerBase):
-    """
-    Event handler responsible for managing terminal sessions for frontend xterm
-    sessions to connect to. You need to instanciate this in order for frontend
-    terminals to work.
-
-    This EventHandler accepts messages that have a data['command'] key specifying
-    a command to be executed.
-    The API of each command is documented in their respective handler.
-    """
-    def __init__(self, key, monitor):
-        """
-        :param key: key this EventHandler listens to
-        :param monitor: tfw.components.HistoryMonitor instance to read command history from
-        """
-        super().__init__(key)
-        self._historymonitor = monitor
-        bash_as_user_cmd = ['sudo', '-u', TAOENV.USER, 'bash']
-
-        self.terminado_server = TerminadoMiniServer(
-            '/terminal',
-            TFWENV.TERMINADO_PORT,
-            TFWENV.TERMINADO_WD,
-            bash_as_user_cmd
-        )
-
-        self.commands = {
-            'write': self.write,
-            'read': self.read
-        }
-
-        if self._historymonitor:
-            self._historymonitor.watch()
-        self.terminado_server.listen()
-
-    @property
-    def historymonitor(self):
-        return self._historymonitor
-
-    def handle_event(self, message):
-        LOG.debug('TerminadoEventHandler received event: %s', message)
-        try:
-            data = message['data']
-            message['data'] = self.commands[data['command']](data)
-            return message
-        except KeyError:
-            LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
-
-    def write(self, data):
-        """
-        Writes a string to the terminal session (on the pty level).
-        Useful for pre-typing and executing commands for the user.
-
-        :param data: TFW message data containing 'value'
-                     (command to be written to the pty)
-        """
-        self.terminado_server.pty.write(data['value'])
-        return data
-
-    def read(self, data):
-        """
-        Reads the history of commands executed.
-
-        :param data: TFW message data containing 'count'
-                     (the number of history elements to return)
-        :return dict: message with list of commands in data['history']
-        """
-        data['count'] = int(data.get('count', 1))
-        if self.historymonitor:
-            data['history'] = self.historymonitor.history[-data['count']:]
-        return data
-
-    def cleanup(self):
-        if self.historymonitor:
-            self.historymonitor.stop()

lib/tfw/config/__init__.py

@@ -1,4 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from .envvars import TFWENV

lib/tfw/config/envvars.py

@@ -1,6 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from envvars import LazyEnvironment
-
-TFWENV = LazyEnvironment('TFW_', 'tfwenvtuple').environment

lib/tfw/config/logs.py

@@ -1,6 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-import logging
-
-logging.basicConfig(level=logging.DEBUG)

lib/tfw/decorators/__init__.py

@@ -1,2 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.

lib/tfw/decorators/rate_limiter.py

@@ -1,101 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from functools import wraps, partial
-from time import time, sleep
-
-from tfw.decorators.lazy_property import lazy_property
-
-
-class RateLimiter:
-    """
-    Decorator class for rate limiting, blocking.
-
-    When applied to a function this decorator will apply rate limiting
-    if the function is invoked more frequently than rate_per_seconds.
-
-    By default rate limiting means sleeping until the next invocation time
-    as per __init__ parameter rate_per_seconds.
-
-    Note that this decorator BLOCKS THE THREAD it is being executed on,
-    so it is only acceptable for stuff running on a separate thread.
-
-    If this is no good for you please refer to AsyncRateLimiter in this module,
-    which is designed not to block and use the IOLoop it is being called from.
-    """
-    def __init__(self, rate_per_second):
-        """
-        :param rate_per_second: max frequency the decorated method should be
-                                invoked with
-        """
-        self.min_interval = 1 / float(rate_per_second)
-        self.fun = None
-        self.last_call = time()
-
-    def action(self, seconds_to_next_call):
-        if seconds_to_next_call:
-            sleep(seconds_to_next_call)
-        self.fun()
-
-    def __call__(self, fun):
-        @wraps(fun)
-        def wrapper(*args, **kwargs):
-            self.fun = partial(fun, *args, **kwargs)
-            limit_seconds = self._limit_rate()
-            self.action(limit_seconds)
-        return wrapper
-
-    def _limit_rate(self):
-        seconds_since_last_call = time() - self.last_call
-        seconds_to_next_call = self.min_interval - seconds_since_last_call
-
-        if seconds_to_next_call > 0:
-            return seconds_to_next_call
-        self.last_call = time()
-        return 0
-
-
-class AsyncRateLimiter(RateLimiter):
-    """
-    Decorator class for rate limiting, non-blocking.
-
-    The semantics of the rate limiting:
-        - unlike RateLimiter this decorator never blocks, instead it adds an async
-          callback version of the decorated function to the IOLoop
-          (to be executed after the rate limiting has expired).
-        - the timing works similarly to RateLimiter
-    """
-    def __init__(self, rate_per_second, ioloop_factory):
-        """
-        :param rate_per_second: max frequency the decorated method should be
-                                invoked with
-        :param ioloop_factory: callable that should return an instance of the
-                               IOLoop of the application
-        """
-        self._ioloop_factory = ioloop_factory
-        self._ioloop = None
-        self._last_callback = None
-
-        self._make_action_thread_safe()
-        super().__init__(rate_per_second=rate_per_second)
-
-    def _make_action_thread_safe(self):
-        self.action = partial(self.ioloop.add_callback, self.action)
-
-    @lazy_property
-    def ioloop(self):
-        return self._ioloop_factory()
-
-    def action(self, seconds_to_next_call):
-        # pylint: disable=method-hidden
-        if self._last_callback:
-            self.ioloop.remove_timeout(self._last_callback)
-
-        self._last_callback = self.ioloop.call_later(
-            seconds_to_next_call,
-            self.fun_with_debounce
-        )
-
-    def fun_with_debounce(self):
-        self.last_call = time()
-        self.fun()

lib/tfw/event_handler_base/__init__.py

@@ -1,6 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from .event_handler_base import EventHandlerBase
-from .boradcasting_event_handler import BroadcastingEventHandler
-from .fsm_aware_event_handler import FSMAwareEventHandler

lib/tfw/event_handler_base/boradcasting_event_handler.py

@@ -1,30 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from abc import ABC
-
-from tfw.event_handler_base.event_handler_base import EventHandlerBase
-from tfw.crypto import message_checksum
-
-
-class BroadcastingEventHandler(EventHandlerBase, ABC):
-    # pylint: disable=abstract-method
-    """
-    Abstract base class for EventHandlers which broadcast responses
-    and intelligently ignore their own broadcasted messages they receive.
-    """
-    def __init__(self, key):
-        super().__init__(key)
-        self.own_message_hashes = []
-
-    def event_handler_callback(self, message):
-        message_hash = message_checksum(message)
-
-        if message_hash in self.own_message_hashes:
-            self.own_message_hashes.remove(message_hash)
-            return
-
-        response = self.dispatch_handling(message)
-        if response:
-            self.own_message_hashes.append(message_checksum(response))
-            self.server_connector.broadcast(response)

lib/tfw/event_handler_base/event_handler_base.py

@@ -1,126 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from abc import ABC, abstractmethod
-from inspect import currentframe
-from typing import Iterable
-
-from tfw.networking.event_handlers.server_connector import ServerConnector
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class EventHandlerBase(ABC):
-    """
-    Abstract base class for all Python based EventHandlers. Useful implementation template
-    for other languages.
-
-    Derived classes must implement the handle_event() method
-    """
-    def __init__(self, key):
-        self.server_connector = ServerConnector()
-        self.keys = []
-        if isinstance(key, str):
-            self.keys.append(key)
-        elif isinstance(key, Iterable):
-            self.keys = list(key)
-
-        self.subscribe(*self.keys)
-        self.server_connector.register_callback(self.event_handler_callback)
-
-    @property
-    def key(self):
-        """
-        Returns the oldest key this EventHandler was subscribed to.
-        """
-        return self.keys[0]
-
-    def event_handler_callback(self, message):
-        """
-        Callback that is invoked when receiving a message.
-        Dispatches messages to handler methods and sends
-        a response back in case the handler returned something.
-        This is subscribed in __init__().
-        """
-        if not self.check_key(message):
-            return
-
-        response = self.dispatch_handling(message)
-        if response:
-            self.server_connector.send(response)
-
-    def check_key(self, message):
-        """
-        Checks whether the message is intended for this
-        EventHandler.
-
-        This is necessary because ZMQ handles PUB - SUB
-        connetions with pattern matching (e.g. someone
-        subscribed to 'fsm' will receive 'fsm_update'
-        messages as well.
-        """
-        if '' in self.keys:
-            return True
-        return message['key'] in self.keys
-
-    def dispatch_handling(self, message):
-        """
-        Used to dispatch messages to their specific handlers.
-
-        :param message: the message received
-        :returns: the message to send back
-        """
-        return self.handle_event(message)
-
-    @abstractmethod
-    def handle_event(self, message):
-        """
-        Abstract method that implements the handling of messages.
-
-        :param message: the message received
-        :returns: the message to send back
-        """
-        raise NotImplementedError
-
-    def subscribe(self, *keys):
-        """
-        Subscribe this EventHandler to receive events for given keys.
-        Note that you can subscribe to the same key several times in which
-        case you will need to unsubscribe multiple times in order to stop
-        receiving events.
-
-        :param keys: list of keys to subscribe to
-        """
-        for key in keys:
-            self.server_connector.subscribe(key)
-            self.keys.append(key)
-
-    def unsubscribe(self, *keys):
-        """
-        Unsubscribe this eventhandler from the given keys.
-
-        :param keys: list of keys to unsubscribe from
-        """
-        for key in keys:
-            self.server_connector.unsubscribe(key)
-            self.keys.remove(key)
-
-    def cleanup(self):
-        """
-        Perform cleanup actions such as releasing database
-        connections and stuff like that.
-        """
-        pass
-
-    @classmethod
-    def get_local_instances(cls):
-        frame = currentframe()
-        if frame is None:
-            raise EnvironmentError('inspect.currentframe() is not supported!')
-
-        locals_values = frame.f_back.f_locals.values()
-        return {
-            instance for instance in locals_values
-            if isinstance(instance, cls)
-        }

lib/tfw/event_handler_base/fsm_aware_event_handler.py

@@ -1,24 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from abc import ABC
-
-from tfw.event_handler_base.event_handler_base import EventHandlerBase
-from tfw.networking.fsm_aware import FSMAware
-
-
-class FSMAwareEventHandler(EventHandlerBase, FSMAware, ABC):
-    # pylint: disable=abstract-method
-    """
-    Abstract base class for EventHandlers which automatically
-    keep track of the state of the TFW FSM.
-    """
-    def __init__(self, key):
-        EventHandlerBase.__init__(self, key)
-        FSMAware.__init__(self)
-        self.subscribe('fsm_update')
-
-    def dispatch_handling(self, message):
-        if self.update_fsm_data(message):
-            return None
-        return super().dispatch_handling(message)

lib/tfw/fsm/__init__.py

@@ -1,6 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from .fsm_base import FSMBase
-from .linear_fsm import LinearFSM
-from .yaml_fsm import YamlFSM

lib/tfw/mixins/__init__.py

@@ -1,2 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.

lib/tfw/mixins/monitor_manager_mixin.py

@@ -1,30 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class MonitorManagerMixin:
-    def __init__(self, monitor_type, *monitor_args):
-        self._monitor_type = monitor_type
-        self._monitor = None
-        self.monitor_args = monitor_args
-        self.reload_monitor()
-
-    @property
-    def monitor(self):
-        return self._monitor
-
-    def set_monitor_args(self, *monitor_args):
-        self.monitor_args = monitor_args
-
-    def reload_monitor(self):
-        if self._monitor:
-            try:
-                self._monitor.stop()
-            except KeyError:
-                LOG.debug('Working directory was removed – ignoring...')
-        self._monitor = self._monitor_type(*self.monitor_args)
-        self._monitor.watch()   # This runs on a separate thread

lib/tfw/mixins/observer_mixin.py

@@ -1,20 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from watchdog.observers import Observer
-
-from tfw.decorators.lazy_property import lazy_property
-
-
-class ObserverMixin:
-    @lazy_property
-    def observer(self):
-        # pylint: disable=no-self-use
-        return Observer()
-
-    def watch(self):
-        self.observer.start()
-
-    def stop(self):
-        self.observer.stop()
-        self.observer.join()

lib/tfw/networking/__init__.py

@@ -1,6 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from .message_sender import MessageSender
-from .event_handlers.server_connector import ServerUplinkConnector as TFWServerConnector
-from .server.tfw_server import TFWServer

lib/tfw/networking/event_handlers/__init__.py

@@ -1,2 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.

lib/tfw/networking/event_handlers/server_connector.py

@@ -1,79 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from functools import partial
-
-import zmq
-from zmq.eventloop.zmqstream import ZMQStream
-
-from tfw.networking.zmq_connector_base import ZMQConnectorBase
-from tfw.networking.serialization import serialize_tfw_msg, with_deserialize_tfw_msg
-from tfw.config import TFWENV
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class ServerDownlinkConnector(ZMQConnectorBase):
-    def __init__(self, zmq_context=None):
-        super(ServerDownlinkConnector, self).__init__(zmq_context)
-        self._zmq_sub_socket = self._zmq_context.socket(zmq.SUB)
-        self._zmq_sub_socket.connect(f'tcp://localhost:{TFWENV.PUBLISHER_PORT}')
-        self._zmq_sub_stream = ZMQStream(self._zmq_sub_socket)
-
-        self.subscribe = partial(self._zmq_sub_socket.setsockopt_string, zmq.SUBSCRIBE)
-        self.unsubscribe = partial(self._zmq_sub_socket.setsockopt_string, zmq.UNSUBSCRIBE)
-
-    def register_callback(self, callback):
-        callback = with_deserialize_tfw_msg(callback)
-        self._zmq_sub_stream.on_recv(callback)
-
-
-class ServerUplinkConnector(ZMQConnectorBase):
-    """
-    Class capable of sending messages to the TFW server and event handlers.
-    """
-    def __init__(self, zmq_context=None):
-        super(ServerUplinkConnector, self).__init__(zmq_context)
-        self._zmq_push_socket = self._zmq_context.socket(zmq.PUSH)
-        self._zmq_push_socket.connect(f'tcp://localhost:{TFWENV.RECEIVER_PORT}')
-
-    def send_to_eventhandler(self, message):
-        """
-        Send a message to an event handler through the TFW server.
-
-        This envelopes the desired message in the 'data' field of the message to
-        TFWServer, which will mirror it to event handlers.
-
-        :param message: JSON message you want to send
-        """
-        self.send({
-            'key': 'mirror',
-            'data': message
-        })
-
-    def send(self, message):
-        """
-        Send a message to the frontend through the TFW server.
-
-        :param message: JSON message you want to send
-        """
-        self._zmq_push_socket.send_multipart(serialize_tfw_msg(message))
-
-    def broadcast(self, message):
-        """
-        Broadast a message through the TFW server.
-
-        This envelopes the desired message in the 'data' field of the message to
-        TFWServer, which will broadast it.
-
-        :param message: JSON message you want to send
-        """
-        self.send({
-            'key': 'broadcast',
-            'data': message
-        })
-
-
-class ServerConnector(ServerUplinkConnector, ServerDownlinkConnector):
-    pass

lib/tfw/networking/fsm_aware.py

@@ -1,46 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from tfw.crypto import KeyManager, verify_message
-
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class FSMAware:
-    """
-    Base class for stuff that has to be aware of the framework FSM.
-    This is done by processing 'fsm_update' messages.
-    """
-    def __init__(self):
-        self.fsm_state = None
-        self.fsm_in_accepted_state = False
-        self.fsm_event_log = []
-        self._auth_key = KeyManager().auth_key
-
-    def update_fsm_data(self, message):
-        if message['key'] == 'fsm_update' and verify_message(self._auth_key, message):
-            self._handle_fsm_update(message)
-            return True
-        return False
-
-    def _handle_fsm_update(self, message):
-        try:
-            update_data = message['data']
-            new_state = update_data['current_state']
-            if self.fsm_state != new_state:
-                self.handle_fsm_step(**update_data)
-            self.fsm_state = new_state
-            self.fsm_in_accepted_state = update_data['in_accepted_state']
-            self.fsm_event_log.append(update_data)
-        except KeyError:
-            LOG.error('Invalid fsm_update message received!')
-
-    def handle_fsm_step(self, **kwargs):
-        """
-        Called in case the TFW FSM has stepped.
-
-        :param kwargs: fsm_update 'data' field
-        """
-        pass

lib/tfw/networking/message_sender.py

@@ -1,54 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from tfw.networking.event_handlers.server_connector import ServerUplinkConnector
-
-
-class MessageSender:
-    """
-    Provides mechanisms to send messages to our frontend messaging component.
-    """
-    def __init__(self):
-        self.server_connector = ServerUplinkConnector()
-        self.key = 'message'
-        self.queue_key = 'queueMessages'
-
-    def send(self, originator, message):
-        """
-        Sends a message.
-        :param originator: name of sender to be displayed on the frontend
-        :param message: message to send
-        """
-        data = {
-            'originator': originator,
-            'message': message
-        }
-        self.server_connector.send({
-            'key': self.key,
-            'data': data
-        })
-
-    def queue_messages(self, originator, messages):
-        """
-        Queues a list of messages to be displayed in a chatbot-like manner.
-        :param originator: name of sender to be displayed on the frontend
-        :param messages: list of messages to queue
-        """
-        data = {
-            'messages': [
-                {'message': message, 'originator': originator}
-                for message in messages
-            ]
-        }
-        self.server_connector.send({
-            'key': self.queue_key,
-            'data': data
-        })
-
-    @staticmethod
-    def generate_messages_from_queue(queue_message):
-        for message in queue_message['data']['messages']:
-            yield {
-                'key': 'message',
-                'data': message
-            }

lib/tfw/networking/server/__init__.py

@@ -1,2 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.

lib/tfw/networking/server/event_handler_connector.py

@@ -1,40 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-import zmq
-from zmq.eventloop.zmqstream import ZMQStream
-
-from tfw.networking.zmq_connector_base import ZMQConnectorBase
-from tfw.networking.serialization import serialize_tfw_msg, with_deserialize_tfw_msg
-from tfw.config import TFWENV
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class EventHandlerDownlinkConnector(ZMQConnectorBase):
-    def __init__(self, zmq_context=None):
-        super(EventHandlerDownlinkConnector, self).__init__(zmq_context)
-        self._zmq_pull_socket = self._zmq_context.socket(zmq.PULL)
-        self._zmq_pull_stream = ZMQStream(self._zmq_pull_socket)
-        address = f'tcp://*:{TFWENV.RECEIVER_PORT}'
-        self._zmq_pull_socket.bind(address)
-        LOG.debug('Pull socket bound to %s', address)
-
-
-class EventHandlerUplinkConnector(ZMQConnectorBase):
-    def __init__(self, zmq_context=None):
-        super(EventHandlerUplinkConnector, self).__init__(zmq_context)
-        self._zmq_pub_socket = self._zmq_context.socket(zmq.PUB)
-        address = f'tcp://*:{TFWENV.PUBLISHER_PORT}'
-        self._zmq_pub_socket.bind(address)
-        LOG.debug('Pub socket bound to %s', address)
-
-
-class EventHandlerConnector(EventHandlerDownlinkConnector, EventHandlerUplinkConnector):
-    def register_callback(self, callback):
-        callback = with_deserialize_tfw_msg(callback)
-        self._zmq_pull_stream.on_recv(callback)
-
-    def send_message(self, message: dict):
-        self._zmq_pub_socket.send_multipart(serialize_tfw_msg(message))

lib/tfw/networking/server/tfw_server.py

@@ -1,114 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from abc import ABC, abstractmethod
-from contextlib import suppress
-
-from tornado.web import Application
-
-from tfw.networking.server.zmq_websocket_proxy import ZMQWebSocketProxy
-from tfw.networking.event_handlers.server_connector import ServerUplinkConnector
-from tfw.networking.server.event_handler_connector import EventHandlerConnector
-from tfw.networking.message_sender import MessageSender
-from tfw.networking.fsm_aware import FSMAware
-from tfw.crypto import KeyManager, verify_message, sign_message
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class TFWServer(FSMAware):
-    """
-    This class handles the proxying of messages between the frontend and event handers.
-    It proxies messages from the "/ws" route to all event handlers subscribed to a ZMQ
-    SUB socket.
-    """
-    def __init__(self):
-        super().__init__()
-        self._event_handler_connector = EventHandlerConnector()
-        self._uplink_connector = ServerUplinkConnector()
-        self._auth_key = KeyManager().auth_key
-
-        self.application = Application([(
-            r'/ws', ZMQWebSocketProxy, {
-                'event_handler_connector': self._event_handler_connector,
-                'proxy_filters_and_callbacks': {
-                    'message_handlers': [
-                        self.handle_trigger,
-                        self.handle_recover,
-                        self.handle_fsm_update
-                    ],
-                    'frontend_message_handlers': [self.save_frontend_messages]
-                }
-            }
-        )])
-
-        self._frontend_messages = FrontendMessageStorage()
-
-    def handle_trigger(self, message):
-        if 'trigger' in message:
-            LOG.debug('Executing handler for trigger "%s"', message.get('trigger', ''))
-            fsm_eh_command = {
-                'key': 'fsm',
-                'data': {
-                    'command': 'trigger',
-                    'value': message['trigger']
-                }
-            }
-            if verify_message(self._auth_key, message):
-                sign_message(self._auth_key, fsm_eh_command)
-            self._uplink_connector.send_to_eventhandler(fsm_eh_command)
-
-    def handle_recover(self, message):
-        if message['key'] == 'recover':
-            self._frontend_messages.replay_messages(self._uplink_connector)
-            self._frontend_messages.clear()
-
-    def handle_fsm_update(self, message):
-        self.update_fsm_data(message)
-
-    def save_frontend_messages(self, message):
-        self._frontend_messages.save_message(message)
-
-    def listen(self, port):
-        self.application.listen(port)
-
-
-class MessageStorage(ABC):
-    def __init__(self):
-        self.saved_messages = []
-
-    def save_message(self, message):
-        with suppress(KeyError, AttributeError):
-            if self.filter_message(message):
-                self.saved_messages.extend(self.transform_message(message))
-
-    @abstractmethod
-    def filter_message(self, message):
-        raise NotImplementedError
-
-    def transform_message(self, message):   # pylint: disable=no-self-use
-        yield message
-
-    def clear(self):
-        self.saved_messages.clear()
-
-
-class FrontendMessageStorage(MessageStorage):
-    def filter_message(self, message):
-        key = message['key']
-        command = message.get('data', {}).get('command')
-        return (
-            key in ('message', 'dashboard', 'queueMessages')
-            or key == 'ide' and command in ('select', 'read')
-        )
-
-    def transform_message(self, message):
-        if message['key'] == 'queueMessages':
-            yield from MessageSender.generate_messages_from_queue(message)
-        else:
-            yield message
-
-    def replay_messages(self, connector):
-        for message in self.saved_messages:
-            connector.send(message)

lib/tfw/networking/server/zmq_websocket_proxy.py

@@ -1,155 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-import json
-
-from tornado.websocket import WebSocketHandler
-
-from tfw.mixins.callback_mixin import CallbackMixin
-from tfw.config.logs import logging
-
-LOG = logging.getLogger(__name__)
-
-
-class ZMQWebSocketProxy(WebSocketHandler):
-    # pylint: disable=abstract-method
-    instances = set()
-    sequence_number = 0
-
-    def initialize(self, **kwargs): # pylint: disable=arguments-differ
-        self._event_handler_connector = kwargs['event_handler_connector']
-        self._proxy_filters_and_callbacks = kwargs.get('proxy_filters_and_callbacks', {})
-
-        self.proxy_eventhandler_to_websocket = TFWProxy(
-            self.send_eventhandler_message,
-            self.send_websocket_message
-        )
-        self.proxy_websocket_to_eventhandler = TFWProxy(
-            self.send_websocket_message,
-            self.send_eventhandler_message
-        )
-
-        self.subscribe_proxy_callbacks()
-
-    def subscribe_proxy_callbacks(self):
-        eventhandler_message_handlers = self._proxy_filters_and_callbacks.get('eventhandler_message_handlers', [])
-        frontend_message_handlers = self._proxy_filters_and_callbacks.get('frontend_message_handlers', [])
-        message_handlers = self._proxy_filters_and_callbacks.get('message_handlers', [])
-        proxy_filters = self._proxy_filters_and_callbacks.get('proxy_filters', [])
-
-        self.proxy_websocket_to_eventhandler.subscribe_proxy_callbacks_and_filters(
-            eventhandler_message_handlers + message_handlers,
-            proxy_filters
-        )
-
-        self.proxy_eventhandler_to_websocket.subscribe_proxy_callbacks_and_filters(
-            frontend_message_handlers + message_handlers,
-            proxy_filters
-        )
-
-    def prepare(self):
-        ZMQWebSocketProxy.instances.add(self)
-
-    def on_close(self):
-        ZMQWebSocketProxy.instances.remove(self)
-
-    def open(self, *args, **kwargs):
-        LOG.debug('WebSocket connection initiated')
-        self._event_handler_connector.register_callback(self.eventhander_callback)
-
-    def eventhander_callback(self, message):
-        """
-        Invoked on ZMQ messages from event handlers.
-        """
-        self.sequence_message(message)
-        LOG.debug('Received on pull socket: %s', message)
-        self.proxy_eventhandler_to_websocket(message)
-
-    @classmethod
-    def sequence_message(cls, message):
-        cls.sequence_number += 1
-        message['seq'] = cls.sequence_number
-
-    def on_message(self, message):
-        """
-        Invoked on WS messages from frontend.
-        """
-        message = json.loads(message)
-        self.sequence_message(message)
-        LOG.debug('Received on WebSocket: %s', message)
-        self.proxy_websocket_to_eventhandler(message)
-
-    def send_eventhandler_message(self, message):
-        self._event_handler_connector.send_message(message)
-
-    @staticmethod
-    def send_websocket_message(message):
-        for instance in ZMQWebSocketProxy.instances:
-            instance.write_message(message)
-
-    # much secure, very cors, wow
-    def check_origin(self, origin):
-        return True
-
-
-class TFWProxy:
-    # pylint: disable=protected-access
-    def __init__(self, to_source, to_destination):
-        self.to_source = to_source
-        self.to_destination = to_destination
-
-        self.proxy_filters = CallbackMixin()
-        self.proxy_callbacks = CallbackMixin()
-
-        self.proxy_filters.subscribe_callback(self.validate_message)
-
-        self.keyhandlers = {
-            'mirror':    self.mirror,
-            'broadcast': self.broadcast
-        }
-
-    @staticmethod
-    def validate_message(message):
-        if 'key' not in message:
-            raise ValueError('Invalid TFW message format!')
-
-    def __call__(self, message):
-        if not self.filter_and_execute_callbacks(message):
-            return
-
-        if message['key'] not in self.keyhandlers:
-            self.to_destination(message)
-        else:
-            handler = self.keyhandlers[message['key']]
-            try:
-                handler(message)
-            except KeyError:
-                LOG.error('Invalid "%s" message format! Ignoring.', handler.__name__)
-
-    def filter_and_execute_callbacks(self, message):
-        try:
-            self.proxy_filters._execute_callbacks(message)
-            self.proxy_callbacks._execute_callbacks(message)
-            return True
-        except ValueError:
-            LOG.exception('Invalid TFW message received!')
-            return False
-
-    def mirror(self, message):
-        message = message['data']
-        if not self.filter_and_execute_callbacks(message):
-            return
-        LOG.debug('Mirroring message: %s', message)
-        self.to_source(message)
-
-    def broadcast(self, message):
-        message = message['data']
-        if not self.filter_and_execute_callbacks(message):
-            return
-        LOG.debug('Broadcasting message: %s', message)
-        self.to_source(message)
-        self.to_destination(message)
-
-    def subscribe_proxy_callbacks_and_filters(self, proxy_callbacks, proxy_filters):
-        self.proxy_callbacks.subscribe_callbacks(*proxy_callbacks)
-        self.proxy_filters.subscribe_callbacks(*proxy_filters)

lib/tfw/networking/zmq_connector_base.py

@@ -1,9 +0,0 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-import zmq
-
-
-class ZMQConnectorBase:
-    def __init__(self, zmq_context=None):
-        self._zmq_context = zmq_context or zmq.Context.instance()

pytest.ini

@@ -0,0 +1,4 @@
+[pytest]
+filterwarnings =
+    ignore::DeprecationWarning:zmq
+    ignore::DeprecationWarning:watchdog

requirements.txt

@@ -1,9 +1,15 @@
-tornado==5.1
+tornado>=6.0.0,<7.0.0
-pyzmq==17.1.2
+pyzmq>=17.0.0,<18.0.0
-transitions==0.6.6
+transitions>=0.0.0,<1.0.0
-terminado==0.8.1
+terminado>=0.0.0,<1.0.0
-watchdog==0.8.3
+watchdog>=0.0.0,<1.0.0
-PyYAML==3.13
+PyYAML>=5.0.0,<6.0.0
-Jinja2==2.10
+Jinja2>=2.0.0,<3.0.0
-cryptography==2.3.1
+cryptography>=2.0.0,<3.0.0
-python-dateutil==2.7.3
+python-dateutil>=2.0.0,<3.0.0
+SQLAlchemy>=1.0.0,<2.0.0
+python-dateutil>=2.0.0,<3.0.0
+pytest>=5.0.0,<6.0.0
+pylint>=2.0.0,<3.0.0
+rope>=0.0.0,<1.0.0
+pipe-io-server>=1.0.0,<2.0.0

setup.py

@@ -1,6 +1,6 @@
 from os.path import dirname, realpath, join
 
-from setuptools import setup, find_packages
+from setuptools import setup
 
 here = dirname(realpath(__file__))
 
@@ -10,20 +10,20 @@ with open(join(here, 'requirements.txt'), 'r') as ifile:
     requirements = ifile.read().splitlines()
 
 setup(
-    name = 'tfw',
+    name='tfw',
-    version = version,
+    version=version,
-    description = 'Avatao tutorial-framework',
+    description='Avatao tutorial-framework',
-    url = 'https://github.com/avatao-content/baseimage-tutorial-framework',
+    url='https://github.com/avatao-content/baseimage-tutorial-framework',
-    author = 'Avatao.com Innovative Learning Kft.',
+    author='Avatao.com Innovative Learning Kft.',
-    author_email = 'support@avatao.com',
+    author_email='support@avatao.com',
-    license = 'custom',
+    license='custom',
-    packages = find_packages('lib'),
+    packages=['tfw'],
-    package_dir = {'': 'lib'},
+    package_dir={'tfw': 'tfw'},
-    install_requires = requirements,
+    install_requires=requirements,
-    extras_require = {
+    extras_require={
         'docs': [
             'sphinx >= 1.7.0',
         ],
     },
-    zip_safe = False,
+    zip_safe=False,
 )

supervisor/components/tfw_init.conf

@@ -0,0 +1,6 @@
+[program:tfw_init]
+user=root
+directory=/tmp
+command=bash tfw_init.sh
+autorestart=false
+startsecs=0

supervisor/components/tfw_server.conf

@@ -1,4 +1,4 @@
-[program:tfwserver]
+[program:tfw_server]
 user=root
 directory=%(ENV_TFW_SERVER_DIR)s
-command=python3 tfw_server.py
+command=python3 -u tfw_server.py

supervisor/tfw_init.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+set -euo pipefail
+
+echo "export HISTFILE=\"${TFW_HISTFILE}\"" >> /tmp/bashrc &&
+  cat /tmp/bashrc >> "/home/${AVATAO_USER}/.bashrc"
+
+if [[ -z "${HOTRELOAD-}" ]]; then
+  for dir in "${TFW_LIB_DIR}/tfw" "/etc/nginx" "/etc/supervisor"; do
+    chown -R root:root "${dir}" && chmod -R 700 "${dir}";
+  done
+fi
+
+chmod 777 "${TFW_PIPES_DIR}"
+
+rm -f bashrc requirements.txt tfw_init.sh

supervisor/tfw_server.py

@@ -1,9 +1,11 @@
 from tornado.ioloop import IOLoop
 
-from tfw.networking import TFWServer
+from tfw.main import TFWServer, setup_logger, setup_signal_handlers
-from tfw.config import TFWENV
 
 
 if __name__ == '__main__':
-    TFWServer().listen(TFWENV.WEB_PORT)
+    setup_logger(__file__)
+    TFWServer().listen()
+
+    setup_signal_handlers()
     IOLoop.instance().start()

tfw/components/frontend/__init__.py

@@ -0,0 +1,6 @@
+from .console_logs_handler import ConsoleLogsHandler
+from .frontend_proxy_handler import FrontendProxyHandler
+from .frontend_ready_handler import FrontendReadyHandler
+from .message_queue_handler import MessageQueueHandler
+from .message_sender import MessageSender
+from .frontend_config_handler import FrontendConfigHandler

tfw/components/frontend/console_logs_handler.py

@@ -0,0 +1,19 @@
+import logging
+
+LOG = logging.getLogger(__name__)
+
+
+class ConsoleLogsHandler:
+    keys = ['process.log.new']
+
+    def __init__(self, *, stream):
+        self.stream = stream
+
+    def handle_event(self, message, connector):
+        try:
+            connector.send_message({
+                'key': 'console.write',
+                'content': message[self.stream]
+            })
+        except KeyError:
+            LOG.error('Invalid %s message received: %s', self.keys, message)

tfw/components/frontend/frontend_config_handler/__init__.py

@@ -0,0 +1 @@
+from .frontend_config_handler import FrontendConfigHandler

tfw/components/frontend/frontend_config_handler/frontend_config_handler.py

@@ -0,0 +1,36 @@
+from yaml import safe_load
+
+from tfw.internals.networking import Scope
+
+
+class FrontendConfigHandler:
+    keys = ['frontend.ready']
+
+    def __init__(self, config_path):
+        self._config_path = config_path
+
+    def handle_event(self, _, connector):
+        # pylint: disable=no-self-use
+        for message in self._config_messages:
+            connector.send_message(message)
+        connector.send_message({'key': 'frontend.ready'}, scope=Scope.WEBSOCKET)
+
+    @property
+    def _config_messages(self):
+        config = safe_load(self._config_str)
+        return [
+            self._create_config_message(k, v)
+            for k, v in config.items()
+        ]
+
+    @property
+    def _config_str(self):
+        with open(self._config_path, 'r') as ifile:
+            return ifile.read()
+
+    @staticmethod
+    def _create_config_message(key, value):
+        return {
+            'key': f'frontend.{key}',
+            **value
+        }

tfw/components/frontend/frontend_config_handler/test_frontend_config_handler.py

@@ -0,0 +1,40 @@
+from textwrap import dedent
+
+from .frontend_config_handler import FrontendConfigHandler
+
+
+class MockFrontendConfigHandler(FrontendConfigHandler):
+    @property
+    def _config_str(self):
+        return dedent('''
+        cat:
+            someConfigKey: lel
+            otherStuff:    42
+        foo:
+            hey:           yaaay
+        ''')
+
+
+class MockConnector:
+    def __init__(self):
+        self.messages = []
+
+    def send_message(self, message, **_):
+        self.messages.append(message)
+
+
+def test_frontend_config_handler():
+    connector = MockConnector()
+    handler = MockFrontendConfigHandler('')
+
+    handler.handle_event({'key': 'frontend.ready'}, connector)
+    assert connector.messages[0] == {
+        'key': 'frontend.cat',
+        'someConfigKey': 'lel',
+        'otherStuff': 42
+    }
+    assert connector.messages[1] == {
+        'key': 'frontend.foo',
+        'hey': 'yaaay'
+    }
+    assert connector.messages[-1] == {'key': 'frontend.ready'}

tfw/components/frontend/frontend_proxy_handler.py

@@ -0,0 +1,34 @@
+from tfw.internals.networking import Scope
+
+from .message_storage import FrontendMessageStorage
+
+
+class FrontendProxyHandler:
+    keys = ['console', 'dashboard', 'frontend', 'message', 'ide.read', 'deploy.finish']
+    type_id = 'ControlEventHandler'
+
+    def __init__(self):
+        self.connector = None
+        self._frontend_message_storage = FrontendMessageStorage()
+
+    def send_message(self, message):
+        self.connector.send_message(message, scope=Scope.WEBSOCKET)
+
+    def handle_event(self, message, _):
+        self._frontend_message_storage.save_message(message)
+        if message['key'] == 'frontend.ready':
+            self.recover_frontend()
+            return
+        if self._filter_message(message):
+            self.send_message(message)
+
+    @staticmethod
+    def _filter_message(message):
+        return not message['key'].startswith((
+            'ide',
+            'message.queue'
+        ))
+
+    def recover_frontend(self):
+        for message in self._frontend_message_storage.messages:
+            self.send_message(message)

tfw/components/frontend/frontend_ready_handler.py

@@ -0,0 +1,39 @@
+import logging
+
+from tfw.internals.crypto import KeyManager, sign_message
+
+LOG = logging.getLogger(__name__)
+
+
+class FrontendReadyHandler:
+    keys = ['frontend.ready', 'fsm.update']
+
+    def __init__(self, initial_trigger):
+        self.connector = None
+        self._auth_key = KeyManager().auth_key
+        self.initial_trigger = initial_trigger
+
+        self.commands = {
+            'frontend.ready': self.handle_ready,
+            'fsm.update': self.handle_update
+        }
+
+    def handle_event(self, message, _):
+        try:
+            self.commands[message['key']]()
+        except KeyError:
+            LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
+
+    def handle_ready(self):
+        trigger = {
+            'key': 'fsm.trigger',
+            'transition': self.initial_trigger
+        }
+        sign_message(self._auth_key, trigger)
+        self.connector.send_message(trigger)
+
+    def handle_update(self):
+        self.stop()
+
+    def stop(self):
+        pass

tfw/components/frontend/message_queue_handler/__init__.py

@@ -0,0 +1 @@
+from .message_queue_handler import MessageQueueHandler

tfw/components/frontend/message_queue_handler/message_queue_handler.py

@@ -0,0 +1,43 @@
+from time import sleep
+from queue import Queue
+from threading import Thread
+
+
+class MessageQueueHandler:
+    keys = ['message.queue']
+    type_id = 'ControlEventHandler'
+
+    def __init__(self, wpm):
+        self.connector = None
+        self.wpm = wpm
+        self._queue = Queue()
+        self._thread = Thread(target=self._dispatch_messages)
+
+    def _dispatch_messages(self):
+        for message in iter(self._queue.get, None):
+            wpm = message['wpm'] if 'wpm' in message else self.wpm
+            cps = 5 * wpm / 60
+            sleep(len(message['message']) / cps)
+            self.connector.send_message(message)
+
+    def handle_event(self, message, _):
+        for unpacked in self._generate_messages_from_queue(message):
+            self._queue.put(unpacked)
+
+    @staticmethod
+    def _generate_messages_from_queue(queue_message):
+        last = queue_message['messages'][-1]
+        for message in queue_message['messages']:
+            yield {
+                'key': 'message.send',
+                'typing': message is not last,
+                **message
+            }
+
+    def start(self):
+        self._thread.start()
+
+    def cleanup(self):
+        self._queue.queue.clear()
+        self._queue.put(None)
+        self._thread.join()

tfw/components/frontend/message_queue_handler/test_message_queue.py

@@ -0,0 +1,67 @@
+# pylint: disable=redefined-outer-name
+from math import inf
+from time import sleep
+from os import urandom
+from random import randint
+
+import pytest
+
+from .message_queue_handler import MessageQueueHandler
+
+
+class MockConnector:
+    def __init__(self):
+        self.callback = None
+        self.messages = []
+
+    def raise_event(self, message):
+        self.callback(message, self)
+        sleep(0.01)
+
+    def send_message(self, message):
+        self.messages.append(message)
+
+
+@pytest.fixture
+def handler():
+    connector = MockConnector()
+    handler = MessageQueueHandler(inf)
+    handler.connector = connector
+    connector.callback = handler.handle_event
+    handler.start()
+    yield handler
+    handler.cleanup()
+
+
+@pytest.fixture
+def queue():
+    yield {
+        'key': 'message.queue',
+        'messages': [
+            {'originator': urandom(4).hex(), 'message': urandom(16).hex()}
+            for _ in range(randint(5, 10))
+        ]
+    }
+
+
+def test_message_order(handler, queue):
+    handler.connector.raise_event(queue)
+    old_list = queue['messages']
+    new_list = handler.connector.messages
+    length = len(old_list)
+    assert len(new_list) == length
+    for i in range(length):
+        unpacked = new_list[i]
+        assert unpacked['key'] == 'message.send'
+        assert unpacked['originator'] == old_list[i]['originator']
+        assert unpacked['typing'] == (i < length-1)
+
+
+def test_wpm(handler, queue):
+    handler.wpm = 10000
+    handler.connector.raise_event(queue)
+    assert not handler.connector.messages
+    handler.wpm = 100000000
+    handler.connector.raise_event(queue)
+    sleep(0.25)
+    assert len(handler.connector.messages) == 2*len(queue['messages'])

tfw/components/frontend/message_sender.py

@@ -0,0 +1,30 @@
+class MessageSender:
+    def __init__(self, uplink):
+        self.uplink = uplink
+
+    def send(self, message, originator=None):
+        message = {
+            'key': 'message.send',
+            'message': message
+        }
+        if originator:
+            message['originator'] = originator
+        self.uplink.send_message(message)
+
+    def queue_messages(self, messages, originator=None):
+        message_queue = {
+            'key': 'message.queue',
+            'messages': []
+        }
+        for message in messages:
+            next_message = {'message': message}
+            if originator:
+                next_message['originator'] = originator
+            message_queue['messages'].append(next_message)
+        self.uplink.send_message(message_queue)
+
+    def set_originator(self, originator):
+        self.uplink.send_message({
+            'key': 'message.config',
+            'originator': originator
+        })

tfw/components/frontend/message_storage.py

@@ -0,0 +1,49 @@
+from abc import ABC, abstractmethod
+from contextlib import suppress
+
+
+class MessageStorage(ABC):
+    def __init__(self):
+        self._messages = []
+
+    def save_message(self, message):
+        with suppress(KeyError, AttributeError):
+            if self._filter_message(message):
+                self._messages.extend(self._transform_message(message))
+
+    @abstractmethod
+    def _filter_message(self, message):
+        raise NotImplementedError
+
+    def _transform_message(self, message):   # pylint: disable=no-self-use
+        yield message
+
+    def clear(self):
+        self._messages.clear()
+
+    @property
+    def messages(self):
+        yield from self._messages
+
+
+class FrontendMessageStorage(MessageStorage):
+    def _filter_message(self, message):
+        return message['key'].startswith((
+            'console.write',
+            'message.send',
+            'ide.read'
+        ))
+
+    def _transform_message(self, message):
+        transformations = {
+            'ide.read': self._delete_ide_content
+        }
+        if message['key'] in transformations:
+            yield from transformations[message['key']](message)
+        else:
+            yield message
+
+    @staticmethod
+    def _delete_ide_content(message):
+        del message['content']
+        yield message

tfw/components/fsm/__init__.py

@@ -0,0 +1 @@
+from .fsm_handler import FSMHandler

tfw/components/fsm/fsm_handler.py

@@ -0,0 +1,42 @@
+import logging
+
+from tfw.internals.crypto import KeyManager, sign_message
+from tfw.internals.networking import Scope, Intent
+
+from .fsm_updater import FSMUpdater
+
+LOG = logging.getLogger(__name__)
+
+
+class FSMHandler:
+    keys = ['fsm']
+    type_id = 'ControlEventHandler'
+
+    def __init__(self, *, fsm_type):
+        self.connector = None
+        self.fsm = fsm_type()
+        self._fsm_updater = FSMUpdater(self.fsm)
+        self.auth_key = KeyManager().auth_key
+
+        self.command_handlers = {
+            'fsm.trigger': self.handle_trigger,
+            'fsm.update' : self.handle_update
+        }
+
+    def handle_event(self, message, _):
+        try:
+            message = self.command_handlers[message['key']](message)
+            if message:
+                fsm_update_message = self._fsm_updater.fsm_update
+                sign_message(self.auth_key, fsm_update_message)
+                self.connector.send_message(fsm_update_message, Scope.BROADCAST, Intent.EVENT)
+        except KeyError:
+            LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
+
+    def handle_trigger(self, message): # pylint: disable=inconsistent-return-statements
+        if self.fsm.step(message['transition']):
+            return message
+
+    def handle_update(self, message):
+        # pylint: disable=no-self-use
+        return message

tfw/components/fsm/fsm_updater.py

@@ -0,0 +1,26 @@
+class FSMUpdater:
+    def __init__(self, fsm):
+        self.fsm = fsm
+
+    @property
+    def fsm_update(self):
+        return {
+            'key': 'fsm.update',
+            **self.fsm_update_data
+        }
+
+    @property
+    def fsm_update_data(self):
+        valid_transitions = [
+            {'trigger': trigger}
+            for trigger in self.fsm.get_triggers(self.fsm.state)
+        ]
+        if not self.fsm.event_log:
+            return None
+        last_fsm_event = self.fsm.event_log[-1]
+        return {
+            'current_state': self.fsm.state,
+            'valid_transitions': valid_transitions,
+            'in_accepted_state': self.fsm.in_accepted_state,
+            'last_event': last_fsm_event
+        }

tfw/components/ide/__init__.py

@@ -0,0 +1,2 @@
+from .ide_handler import IdeHandler
+from .deploy_handler import DeployHandler

tfw/components/ide/deploy_handler.py

@@ -0,0 +1,34 @@
+import logging
+
+LOG = logging.getLogger(__name__)
+
+
+class DeployHandler:
+    keys = ['deploy.start', 'process.restart']
+
+    def __init__(self, process_name='webservice'):
+        self.connector = None
+        self.process_name = process_name
+
+        self.commands = {
+            'deploy.start': self.handle_deploy,
+            'process.restart': self.handle_process
+        }
+
+    def handle_event(self, message, _):
+        try:
+            self.commands[message['key']](message)
+        except KeyError:
+            LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
+
+    def handle_deploy(self, _):
+        self.connector.send_message({
+            'key': 'process.restart',
+            'name': self.process_name
+        })
+
+    def handle_process(self, message):
+        response = {'key': 'deploy.finish'}
+        if 'error' in message:
+            response['error'] = message['error']
+        self.connector.send_message(response)

tfw/components/ide/file_manager/__init__.py

@@ -0,0 +1 @@
+from .file_manager import FileManager

tfw/components/ide/file_manager/file_manager.py

@@ -0,0 +1,66 @@
+import logging
+from functools import wraps
+from glob import glob
+from fnmatch import fnmatchcase
+from os.path import dirname, isdir, isfile, realpath, isabs
+
+LOG = logging.getLogger(__name__)
+
+
+def _with_is_allowed(func):
+    @wraps(func)
+    def wrapper(self, *args, **kwargs):
+        if self.is_allowed(args[0]):
+            return func(self, *args, **kwargs)
+        raise ValueError('Forbidden path.')
+    return wrapper
+
+
+class FileManager: # pylint: disable=too-many-instance-attributes
+    def __init__(self, patterns):
+        self.patterns = patterns
+
+    @property
+    def files(self):
+        return list(set(
+            path
+            for pattern in self.patterns
+            for path in glob(pattern, recursive=True)
+            if isfile(path) and self.is_allowed(path)
+        ))
+
+    @property
+    def parents(self):
+        return list(set(
+            self._find_directory(pattern)
+            for pattern in self.patterns
+        ))
+
+    @staticmethod
+    def _find_directory(pattern):
+        while pattern and not isdir(pattern):
+            pattern = dirname(pattern)
+        return pattern
+
+    def is_allowed(self, filepath):
+        return any(
+            fnmatchcase(realpath(filepath), pattern)
+            for pattern in self.patterns
+        )
+
+    def find_file(self, filename):
+        if not isabs(filename):
+            for filepath in self.files:
+                if filepath.endswith(filename):
+                    return filepath
+        return filename
+
+    @_with_is_allowed
+    def read_file(self, filepath): # pylint: disable=no-self-use
+        with open(filepath, 'rb', buffering=0) as ifile:
+            return ifile.read().decode(errors='surrogateescape')
+
+    @_with_is_allowed
+    def write_file(self, filepath, contents): # pylint: disable=no-self-use
+        with open(filepath, 'wb', buffering=0) as ofile:
+            ofile.write(contents.encode())

tfw/components/ide/file_manager/test_file_manager.py

@@ -0,0 +1,94 @@
+# pylint: disable=redefined-outer-name
+from dataclasses import dataclass
+from secrets import token_urlsafe
+from os import mkdir, symlink
+from os.path import join, realpath, basename
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+import pytest
+
+from .file_manager import FileManager
+
+
+@dataclass
+class ManagerContext:
+    workdir: str
+    subdir: str
+    subfile: str
+    manager: FileManager
+
+    def create_random_file(self, dirname, extension):
+        filename = self.join(f'{dirname}/{generate_name()}{extension}')
+        Path(filename).touch()
+        return filename
+
+    def create_random_folder(self, basepath):
+        dirname = self.join(f'{basepath}/{generate_name()}')
+        mkdir(dirname)
+        return dirname
+
+    def create_random_link(self, source, dirname, extension):
+        linkname = self.join(f'{dirname}/{generate_name()}{extension}')
+        symlink(source, linkname)
+        return linkname
+
+    def join(self, path):
+        return join(self.workdir, path)
+
+def generate_name():
+    return token_urlsafe(16)
+
+@pytest.fixture()
+def context():
+    with TemporaryDirectory() as workdir:
+        workdir = realpath(workdir)  # macOS uses a symlinked TMPDIR
+        subdir = join(workdir, generate_name())
+        subfile = join(subdir, generate_name() + '.txt')
+        mkdir(subdir)
+        Path(subfile).touch()
+        manager = FileManager([join(workdir, '**/*.txt')])
+        yield ManagerContext(workdir, subdir, subfile, manager)
+
+def test_matching_files(context):
+    newdir = context.create_random_folder(context.subdir)
+    newfile = context.create_random_file(newdir, '.txt')
+    newlink = context.create_random_link(newfile, newdir, '.txt')
+    assert set(context.manager.files) == {context.subfile, newfile, newlink}
+
+def test_unmatching_files(context):
+    newtxt = context.create_random_file(context.workdir, '.txt')
+    newbin = context.create_random_file(context.subdir, '.bin')
+    context.create_random_link(newtxt, context.subdir, '.txt')
+    context.create_random_link(newbin, context.subdir, '.txt')
+    assert context.manager.files == [context.subfile]
+
+def test_parents(context):
+    newdir = context.create_random_folder(context.workdir)
+    context.manager.patterns += [f'{newdir}/[!/@]*/**/?.c']
+    assert set(context.manager.parents) == {context.workdir, newdir}
+
+def test_read_write_file(context):
+    for _ in range(128):
+        content = token_urlsafe(32)
+        context.manager.write_file(context.subfile, content)
+        assert context.manager.read_file(context.subfile) == content
+        with open(context.subfile, 'r') as ifile:
+            assert ifile.read() == content
+
+def test_regular_ide_actions(context):
+    newfile1 = context.create_random_file(context.subdir, '.txt')
+    newfile2 = context.create_random_file(context.subdir, '.txt')
+    for _ in range(4):
+        context.manager.filename = newfile1
+        content1, content2 = token_urlsafe(32), token_urlsafe(32)
+        context.manager.write_file(newfile1, content1)
+        context.manager.write_file(newfile2, content2)
+        assert context.manager.read_file(newfile1) == content1
+        assert context.manager.read_file(newfile2) == content2
+
+def test_find_file(context):
+    for _ in range(5):
+        file_abs = context.create_random_file(context.subdir, '.txt')
+        file_base = basename(file_abs)
+        assert context.manager.find_file(file_base) == file_abs

tfw/components/ide/ide_handler.py

@@ -0,0 +1,101 @@
+import logging
+
+from tfw.internals.networking import Scope
+from tfw.internals.inotify import InotifyObserver
+
+from .file_manager import FileManager
+
+LOG = logging.getLogger(__name__)
+
+BUILD_ARTIFACTS = (
+    "*.a",
+    "*.class",
+    "*.dll",
+    "*.dylib",
+    "*.elf",
+    "*.exe",
+    "*.jar",
+    "*.ko",
+    "*.la",
+    "*.lib",
+    "*.lo",
+    "*.o",
+    "*.obj",
+    "*.out",
+    "*.py[cod]",
+    "*.so",
+    "*.so.*",
+    "*.tar.gz",
+    "*.zip",
+    "*__pycache__*"
+)
+
+
+class IdeHandler:
+    keys = ['ide']
+    type_id = 'ControlEventHandler'
+
+    def __init__(self, *, patterns, initial_file=None):
+        self.connector = None
+        self.filemanager = FileManager(patterns)
+        self._initial_file = initial_file or ''
+
+        self.monitor = InotifyObserver(
+            path=self.filemanager.parents,
+            exclude=BUILD_ARTIFACTS
+        )
+        self.monitor.on_modified = self._reload_frontend
+        self.monitor.start()
+
+        self.commands = {
+            'ide.read'  : self.read,
+            'ide.write' : self.write
+        }
+
+    def _reload_frontend(self, event):  # pylint: disable=unused-argument
+        self.send_message({'key': 'ide.reload'})
+
+    @property
+    def initial_file(self):
+        if not self.filemanager.is_allowed(self._initial_file):
+            self._initial_file = self.filemanager.files[0]
+        return self._initial_file
+
+    def send_message(self, message):
+        self.connector.send_message(message, scope=Scope.WEBSOCKET)
+
+    def handle_event(self, message, _):
+        try:
+            self.commands[message['key']](message)
+            message['files'] = self.filemanager.files
+            self.send_message(message)
+        except KeyError:
+            LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
+
+    def read(self, message):
+        if 'patterns' in message:
+            self.filemanager.patterns = message['patterns']
+        try:
+            message['filename'] = self.filemanager.find_file(
+                message.get('filename') or self.initial_file
+            )
+            message['content'] = self.filemanager.read_file(message['filename'])
+        except (PermissionError, ValueError):
+            message['content'] = 'You have no permission to open that file :('
+        except FileNotFoundError:
+            message['content'] = 'This file does not exist :('
+        except Exception: # pylint: disable=broad-except
+            message['content'] = 'Failed to read file :('
+            LOG.exception('Error reading file!')
+
+    def write(self, message):
+        try:
+            self.filemanager.write_file(message['filename'], message['content'])
+        except KeyError:
+            LOG.error('You must provide a filename to write!')
+        except Exception: # pylint: disable=broad-except
+            LOG.exception('Error writing file!')
+        del message['content']
+
+    def cleanup(self):
+        self.monitor.stop()

tfw/components/pipe_io/__init__.py

@@ -0,0 +1,3 @@
+from .pipe_io_handler import PipeIOHandler, PipeIOHandlerBase
+from .command_handler import CommandHandler
+from .pipe_connector import ProxyPipeConnectorHandler

tfw/components/pipe_io/command_handler.py

@@ -0,0 +1,58 @@
+from subprocess import PIPE, Popen
+from functools import partial
+from os import getpgid, killpg
+from os.path import join
+from signal import SIGTERM
+from secrets import token_urlsafe
+from threading import Thread
+from contextlib import suppress
+
+from pipe_io_server import terminate_process_on_failure
+
+from .pipe_io_handler import PipeIOHandler, DEFAULT_PERMISSIONS
+
+
+class CommandHandler(PipeIOHandler):
+    def __init__(self, command, permissions=DEFAULT_PERMISSIONS):
+        super().__init__(
+            self._generate_tempfilename(),
+            self._generate_tempfilename(),
+            permissions
+        )
+
+        self._proc_stdin = open(self.pipe_io.out_pipe, 'rb')
+        self._proc_stdout = open(self.pipe_io.in_pipe, 'wb')
+        self._proc = Popen(
+            command, shell=True, executable='/bin/bash',
+            stdin=self._proc_stdin, stdout=self._proc_stdout, stderr=PIPE,
+            start_new_session=True
+        )
+        self._monitor_proc_thread = self._start_monitor_proc()
+
+    def _generate_tempfilename(self):
+        # pylint: disable=no-self-use
+        random_filename = partial(token_urlsafe, 10)
+        return join('/tmp', f'{type(self).__name__}.{random_filename()}')
+
+    def _start_monitor_proc(self):
+        thread = Thread(target=self._monitor_proc, daemon=True)
+        thread.start()
+        return thread
+
+    @terminate_process_on_failure
+    def _monitor_proc(self):
+        return_code = self._proc.wait()
+        if return_code == -int(SIGTERM):
+            # supervisord asked the program to terminate, this is fine
+            return
+        if return_code != 0:
+            _, stderr = self._proc.communicate()
+            raise RuntimeError(f'Subprocess failed ({return_code})! Stderr:\n{stderr.decode()}')
+
+    def cleanup(self):
+        with suppress(ProcessLookupError):
+            process_group_id = getpgid(self._proc.pid)
+            killpg(process_group_id, SIGTERM)
+            self._proc_stdin.close()
+            self._proc_stdout.close()
+        super().cleanup()

tfw/components/pipe_io/pipe_connector/__init__.py

@@ -0,0 +1 @@
+from .proxy_pipe_connector_handler import ProxyPipeConnectorHandler

tfw/components/pipe_io/pipe_connector/pipe_connector.py

@@ -0,0 +1,90 @@
+import logging
+from stat import S_ISFIFO
+from os import access, listdir, mkdir, stat, R_OK
+from os.path import exists, join
+
+from pipe_io_server import PipeWriterServer
+
+from tfw.internals.inotify import InotifyObserver, InotifyFileCreatedEvent, InotifyFileDeletedEvent
+
+LOG = logging.getLogger(__name__)
+
+
+class PipeConnector:
+    reader_pattern, writer_pattern = 'send', 'recv'
+
+    def __init__(self, path):
+        self.recv_pipes, self.send_pipes = {}, {}
+        self.observer = self._build_observer(path)
+        self.observer.on_any_event = self._on_any_event
+        self.observer.start()
+        self._connect_existing_pipes(path)
+
+    def _build_observer(self, path): # pylint: disable=no-self-use
+        if not exists(path):
+            mkdir(path)
+        if not access(path, R_OK):
+            raise ValueError('Path does not exist or is not accessible.')
+        return InotifyObserver(path, patterns=[f'*{self.reader_pattern}*', f'*{self.writer_pattern}*'])
+
+    def _connect_existing_pipes(self, path):
+        for node in listdir(path):
+            node_path = join(path, node)
+            if self._is_pipe(node_path):
+                self._create_pipe(node_path)
+                LOG.debug('Connected to existing pipe "%s"', node_path)
+
+    def _on_any_event(self, event):
+        path = event.src_path
+        if self._is_pipe(path) and isinstance(event, InotifyFileCreatedEvent):
+            self._create_pipe(path)
+            LOG.debug('Connected to new pipe "%s"', path)
+        elif isinstance(event, InotifyFileDeletedEvent):
+            self._delete_pipe(path)
+            LOG.debug('Disconnected from deleted pipe "%s"', path)
+
+    @staticmethod
+    def _is_pipe(path):
+        return exists(path) and S_ISFIFO(stat(path).st_mode)
+
+    def _create_pipe(self, path):
+        if self._find_pipe(path):
+            return
+        server = None
+        if self.writer_pattern in path:
+            pipes, server = self.recv_pipes, self.build_writer(path)
+        elif self.reader_pattern in path:
+            pipes, server = self.send_pipes, self.build_reader(path)
+        if server:
+            server.start()
+            pipes[path] = server
+
+    def _find_pipe(self, path):
+        pipes = None
+        if path in self.recv_pipes.keys():
+            pipes = self.recv_pipes
+        if path in self.send_pipes.keys():
+            pipes = self.send_pipes
+        return pipes
+
+    def build_reader(self, path): # pylint: disable=no-self-use
+        raise NotImplementedError()
+
+    def build_writer(self, path): # pylint: disable=no-self-use
+        return PipeWriterServer(path, manage_pipes=False)
+
+    def _delete_pipe(self, path):
+        pipes = self._find_pipe(path)
+        if pipes:
+            pipes[path].stop()
+            del pipes[path]
+
+    def broadcast(self, message):
+        for server in self.recv_pipes.values():
+            server.send_message(message)
+
+    def stop(self):
+        for pipe in self.recv_pipes.values():
+            pipe.stop()
+        for pipe in self.send_pipes.values():
+            pipe.stop()

tfw/components/pipe_io/pipe_connector/proxy_pipe_connector_handler.py

@@ -0,0 +1,46 @@
+import logging
+from threading import Lock
+from json import dumps, loads, JSONDecodeError
+
+from pipe_io_server import PipeReaderServer
+
+from .pipe_connector import PipeConnector
+
+LOG = logging.getLogger(__name__)
+
+
+class ProxyPipeConnectorHandler:
+    keys = ['']
+
+    def __init__(self, path):
+        self.connector, self.pipes = None, None
+        self.path = path
+
+    def start(self):
+        self.pipes = ProxyPipeConnector(self.path, self.connector)
+
+    def handle_event(self, message, _):
+        self.pipes.broadcast(dumps(message).encode())
+
+    def cleanup(self):
+        self.pipes.stop()
+
+
+class ProxyPipeConnector(PipeConnector):
+    def __init__(self, path, connector):
+        self.connector = connector
+        self.mutex = Lock()
+        super().__init__(path)
+
+    def build_reader(self, path):
+        reader = PipeReaderServer(path, manage_pipes=False)
+        reader.handle_message = self._handle_message
+        return reader
+
+    def _handle_message(self, message):
+        try:
+            json_object = loads(message)
+            with self.mutex:
+                self.connector.send_message(json_object)
+        except JSONDecodeError:
+            LOG.error('Received invalid JSON message: %s', message)

tfw/components/pipe_io/pipe_connector/test_proxy_pipe_connector.py

@@ -0,0 +1,157 @@
+# pylint: disable=redefined-outer-name
+from enum import Enum
+from dataclasses import dataclass
+from json import dumps
+from secrets import token_urlsafe
+from os import urandom, mkfifo, mkdir, remove
+from os.path import join
+from pathlib import Path
+from tempfile import TemporaryDirectory
+
+import pytest
+from tfw.internals.inotify import InotifyFileCreatedEvent, InotifyFileDeletedEvent
+
+from .proxy_pipe_connector_handler import ProxyPipeConnector
+
+
+class Action(Enum):
+    SEND = 'send'
+    RECV = 'recv'
+
+
+@dataclass
+class PipeContext:
+    workdir: str
+    pipes: ProxyPipeConnector
+
+    def emit_pipe_creation_event(self, action, inode_creator):
+        filename = self.join(f'{self.generate_name()}_{action.value}')
+        inode_creator(filename)
+        self.pipes.observer.on_any_event(InotifyFileCreatedEvent(filename))
+        return filename
+
+    def join(self, path):
+        return join(self.workdir, path)
+
+    @staticmethod
+    def generate_name():
+        return urandom(4).hex()
+
+
+class MockPipeConnector(ProxyPipeConnector):
+    def __init__(self, path, connector):
+        self.reader_events, self.writer_events = [], []
+        super().__init__(path, connector)
+
+    def _build_observer(self, path):
+        return MockObserver()
+
+    def build_reader(self, path):
+        self.reader_events.append(path)
+        reader = MockPipeServer()
+        reader.handle_message = self._handle_message
+        return reader
+
+    def build_writer(self, path):
+        self.writer_events.append(path)
+        return MockPipeServer()
+
+
+class MockObserver:
+    def start(self):
+        pass
+
+    def on_any_event(self, event):
+        pass
+
+
+class MockPipeServer:
+    def __init__(self):
+        self.messages = []
+
+    def handle_message(self, message):
+        pass
+
+    def send_message(self, message):
+        self.messages.append(message)
+
+    def start(self):
+        pass
+
+    def stop(self):
+        pass
+
+
+class MockConnector: # pylint: disable=too-few-public-methods
+    def __init__(self):
+        self.messages = []
+
+    def send_message(self, message):
+        self.messages.append(message)
+
+
+@pytest.fixture
+def workdir():
+    with TemporaryDirectory() as workdir:
+        yield workdir
+
+
+@pytest.fixture
+def context(workdir):
+    mkfifo(join(workdir, Action.SEND.value))
+    mkfifo(join(workdir, Action.RECV.value))
+    yield PipeContext(workdir, MockPipeConnector(workdir, MockConnector()))
+
+
+def test_existing_pipe_connection(context):
+    assert join(context.workdir, Action.SEND.value) in context.pipes.send_pipes.keys()
+    assert join(context.workdir, Action.RECV.value) in context.pipes.recv_pipes.keys()
+
+
+def test_pipe_creation_deletion(context):
+    cases = [
+        (Action.RECV, context.pipes.recv_pipes, context.pipes.writer_events),
+        (Action.SEND, context.pipes.send_pipes, context.pipes.reader_events)
+    ]
+
+    for action, pipes, events in cases:
+        path = context.emit_pipe_creation_event(action, mkfifo)
+        assert events[-1] == path
+        assert path in pipes.keys()
+        remove(path)
+        context.pipes.observer.on_any_event(InotifyFileDeletedEvent(path))
+        assert path not in pipes.keys()
+
+
+def test_handle_message(context):
+    path = context.emit_pipe_creation_event(Action.SEND, mkfifo)
+    payload = {'key': token_urlsafe(16)}
+    context.pipes.send_pipes[path].handle_message(dumps(payload))
+    assert context.pipes.connector.messages[-1] == payload
+    context.pipes.send_pipes[path].handle_message(token_urlsafe(32))
+    assert len(context.pipes.connector.messages) == 1
+
+
+def test_broadcast(context):
+    paths = [
+        context.emit_pipe_creation_event(Action.RECV, mkfifo)
+        for _ in range(32)
+    ]
+    payload = {'key': token_urlsafe(16)}
+
+    context.pipes.broadcast(payload)
+    for path in paths:
+        assert context.pipes.recv_pipes[path].messages[-1] == payload
+
+def test_inode_types(context):
+    touch = lambda path: Path(path).touch()
+    cases = [
+        (Action.RECV, context.pipes.recv_pipes, mkdir),
+        (Action.SEND, context.pipes.send_pipes, mkdir),
+        (Action.RECV, context.pipes.recv_pipes, touch),
+        (Action.SEND, context.pipes.send_pipes, touch)
+    ]
+
+    for action, pipes, creator in cases:
+        path = context.emit_pipe_creation_event(action, creator)
+        assert path not in pipes.keys()

tfw/components/pipe_io/pipe_io_handler.py

@@ -0,0 +1,47 @@
+import logging
+from abc import abstractmethod
+from json import loads, dumps
+
+from pipe_io_server import PipeIOServer
+
+LOG = logging.getLogger(__name__)
+DEFAULT_PERMISSIONS = 0o600
+
+
+class PipeIOHandlerBase:
+    keys = ['']
+
+    def __init__(self, in_pipe_path, out_pipe_path, permissions=DEFAULT_PERMISSIONS):
+        self.connector = None
+        self.in_pipe = in_pipe_path
+        self.out_pipe = out_pipe_path
+        self.pipe_io = PipeIOServer(
+            in_pipe_path,
+            out_pipe_path,
+            permissions
+        )
+        self.pipe_io.handle_message = self._server_handle_message
+        self.pipe_io.start()
+
+    def _server_handle_message(self, message):
+        try:
+            self.handle_pipe_event(message)
+        except:  # pylint: disable=bare-except
+            LOG.exception('Failed to handle message %s from pipe %s!', message, self.in_pipe)
+
+    @abstractmethod
+    def handle_pipe_event(self, message_bytes):
+        raise NotImplementedError()
+
+    def cleanup(self):
+        self.pipe_io.stop()
+
+
+class PipeIOHandler(PipeIOHandlerBase):
+    def handle_event(self, message, _):
+        json_bytes = dumps(message).encode()
+        self.pipe_io.send_message(json_bytes)
+
+    def handle_pipe_event(self, message_bytes):
+        json = loads(message_bytes)
+        self.connector.send_message(json)

tfw/components/pipe_io/test_pipe_io_handler.py

@@ -0,0 +1,45 @@
+# pylint: disable=redefined-outer-name
+from tempfile import TemporaryDirectory
+from os.path import join
+from queue import Queue
+from json import dumps, loads
+
+import pytest
+
+from .pipe_io_handler import PipeIOHandler
+
+
+@pytest.fixture
+def pipe_io():
+    with TemporaryDirectory() as tmpdir:
+        pipeio = PipeIOHandler(
+            join(tmpdir, 'in'),
+            join(tmpdir, 'out'),
+            permissions=0o600
+        )
+        pipeio.connector = MockConnector()
+        yield pipeio
+        pipeio.cleanup()
+
+
+class MockConnector:
+    def __init__(self):
+        self.messages = Queue()
+
+    def send_message(self, msg):
+        self.messages.put(msg)
+
+
+def test_pipe_io_handler_recv(pipe_io):
+    test_msg = {'key': 'cica'}
+    with open(pipe_io.in_pipe, 'w') as ofile:
+        ofile.write(dumps(test_msg) + '\n')
+
+    assert pipe_io.connector.messages.get() == test_msg
+
+
+def test_pipe_io_handler_send(pipe_io):
+    test_msg = {'key': 'cica'}
+    pipe_io.handle_event(test_msg, None)
+    with open(pipe_io.out_pipe, 'r') as ifile:
+        assert loads(ifile.readline()) == test_msg

tfw/components/process_management/__init__.py

@@ -0,0 +1,2 @@
+from .process_handler import ProcessHandler
+from .process_log_handler import ProcessLogHandler

tfw/components/process_management/log_inotify_observer.py

@@ -0,0 +1,34 @@
+from tfw.internals.networking import Scope, Intent
+from tfw.internals.inotify import InotifyObserver
+
+from .supervisor import ProcessLogManager
+
+
+class LogInotifyObserver(InotifyObserver, ProcessLogManager):
+    def __init__(self, connector, process_name, supervisor_uri, log_tail=0):
+        self._connector = connector
+        self._process_name = process_name
+        self.log_tail = log_tail
+        self._procinfo = None
+        ProcessLogManager.__init__(self, supervisor_uri)
+        InotifyObserver.__init__(self, self._get_logfiles())
+
+    def _get_logfiles(self):
+        self._procinfo = self.supervisor.getProcessInfo(self._process_name)
+        return self._procinfo['stdout_logfile'], self._procinfo['stderr_logfile']
+
+    @property
+    def process_name(self):
+        return self._process_name
+
+    @process_name.setter
+    def process_name(self, process_name):
+        self._process_name = process_name
+        self.paths = self._get_logfiles()
+
+    def on_modified(self, event):
+        self._connector.send_message({
+            'key': 'process.log.new',
+            'stdout': self.read_stdout(self.process_name, tail=self.log_tail),
+            'stderr': self.read_stderr(self.process_name, tail=self.log_tail)
+        }, Scope.BROADCAST, Intent.EVENT)

tfw/components/process_management/process_handler.py

@@ -0,0 +1,33 @@
+import logging
+from xmlrpc.client import Fault as SupervisorFault
+
+from tfw.internals.networking import Scope, Intent
+
+from .supervisor import ProcessManager
+
+LOG = logging.getLogger(__name__)
+
+
+class ProcessHandler(ProcessManager):
+    keys = ['process']
+    type_id = 'ControlEventHandler'
+
+    def __init__(self, *, supervisor_uri):
+        ProcessManager.__init__(self, supervisor_uri)
+
+        self.commands = {
+            'process.start': self.start_process,
+            'process.stop': self.stop_process,
+            'process.restart': self.restart_process
+        }
+
+    def handle_event(self, message, connector):
+        try:
+            try:
+                self.commands[message['key']](message['name'])
+            except SupervisorFault as fault:
+                message['error'] = fault.faultString
+            connector.send_message(message, scope=Scope.BROADCAST, intent=Intent.EVENT)
+        except KeyError:
+            if not message['key'].startswith('process.log'):
+                LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)

tfw/components/process_management/process_log_handler.py

@@ -0,0 +1,44 @@
+import logging
+
+from .log_inotify_observer import LogInotifyObserver
+
+LOG = logging.getLogger(__name__)
+
+
+class ProcessLogHandler:
+    keys = ['process.log']
+    type_id = 'ControlEventHandler'
+
+    def __init__(self, *, process_name, supervisor_uri, log_tail=0):
+        self.connector, self._monitor = None, None
+        self.process_name = process_name
+        self._supervisor_uri = supervisor_uri
+        self._initial_log_tail = log_tail
+
+        self.command_handlers = {
+            'process.log.set': self.handle_set
+        }
+
+    def start(self):
+        self._monitor = LogInotifyObserver(
+            connector=self.connector,
+            process_name=self.process_name,
+            supervisor_uri=self._supervisor_uri,
+            log_tail=self._initial_log_tail
+        )
+        self._monitor.start()
+
+    def handle_event(self, message, _):
+        try:
+            self.command_handlers[message['key']](message)
+        except KeyError:
+            LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
+
+    def handle_set(self, data):
+        if data.get('name'):
+            self._monitor.process_name = data['name']
+        if data.get('tail'):
+            self._monitor.log_tail = data['tail']
+
+    def cleanup(self):
+        self._monitor.stop()

tfw/components/process_management/supervisor.py

@@ -1,23 +1,15 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
+from os import remove
-# All Rights Reserved. See LICENSE file for details.
+from contextlib import suppress
-
 import xmlrpc.client
 from xmlrpc.client import Fault as SupervisorFault
-from contextlib import suppress
-from os import remove
-
-from tfw.decorators.lazy_property import lazy_property
-from tfw.config import TFWENV
 
 
-class SupervisorBaseMixin:
+class SupervisorBase:
-    @lazy_property
+    def __init__(self, supervisor_uri):
-    def supervisor(self):
+        self.supervisor = xmlrpc.client.ServerProxy(supervisor_uri).supervisor
-        # pylint: disable=no-self-use
-        return xmlrpc.client.ServerProxy(TFWENV.SUPERVISOR_HTTP_URI).supervisor
 
 
-class SupervisorMixin(SupervisorBaseMixin):
+class ProcessManager(SupervisorBase):
     def stop_process(self, process_name):
         with suppress(SupervisorFault):
             self.supervisor.stopProcess(process_name)
@@ -30,7 +22,7 @@ class SupervisorMixin(SupervisorBaseMixin):
         self.start_process(process_name)
 
 
-class SupervisorLogMixin(SupervisorBaseMixin):
+class ProcessLogManager(SupervisorBase):
     def read_stdout(self, process_name, tail=0):
         return self.supervisor.readProcessStdoutLog(process_name, -tail, 0)
 

tfw/components/snapshots/__init__.py

@@ -0,0 +1 @@
+from .snapshot_handler import SnapshotHandler

tfw/components/snapshots/snapshot_handler.py

@@ -1,6 +1,4 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
+import logging
-# All Rights Reserved. See LICENSE file for details.
-
 from os.path import join as joinpath
 from os.path import basename
 from os import makedirs
@@ -8,25 +6,24 @@ from datetime import datetime
 
 from dateutil import parser as dateparser
 
-from tfw.event_handler_base import EventHandlerBase
+from .snapshot_provider import SnapshotProvider
-from tfw.components.snapshot_provider import SnapshotProvider
-from tfw.config import TFWENV
-from tfw.config.logs import logging
 
 LOG = logging.getLogger(__name__)
 
 
-class DirectorySnapshottingEventHandler(EventHandlerBase):
+class SnapshotHandler:
-    def __init__(self, key, directories, exclude_unix_patterns=None):
+    keys = ['snapshot']
-        super().__init__(key)
+
+    def __init__(self, *, directories, snapshots_dir, exclude_unix_patterns=None):
+        self._snapshots_dir = snapshots_dir
         self.snapshot_providers = {}
         self._exclude_unix_patterns = exclude_unix_patterns
         self.init_snapshot_providers(directories)
 
         self.command_handlers = {
-            'take_snapshot': self.handle_take_snapshot,
+            'snapshot.take': self.handle_take_snapshot,
-            'restore_snapshot': self.handle_restore_snapshot,
+            'snapshot.restore': self.handle_restore_snapshot,
-            'exclude': self.handle_exclude
+            'snapshot.exclude': self.handle_exclude
         }
 
     def init_snapshot_providers(self, directories):
@@ -38,32 +35,28 @@ class DirectorySnapshottingEventHandler(EventHandlerBase):
                 self._exclude_unix_patterns
             )
 
-    @staticmethod
+    def init_git_dir(self, index, directory):
-    def init_git_dir(index, directory):
         git_dir = joinpath(
-            TFWENV.SNAPSHOTS_DIR,
+            self._snapshots_dir,
             f'{basename(directory)}-{index}'
         )
         makedirs(git_dir, exist_ok=True)
         return git_dir
 
-    def handle_event(self, message):
+    def handle_event(self, message, _):
         try:
-            data = message['data']
+            self.command_handlers[message['key']](message)
-            message['data'] = self.command_handlers[data['command']](data)
-            return message
         except KeyError:
             LOG.error('IGNORING MESSAGE: Invalid message received: %s', message)
 
-    def handle_take_snapshot(self, data):
+    def handle_take_snapshot(self, _):
         LOG.debug('Taking snapshots of directories %s', self.snapshot_providers.keys())
         for provider in self.snapshot_providers.values():
             provider.take_snapshot()
-        return data
 
-    def handle_restore_snapshot(self, data):
+    def handle_restore_snapshot(self, message):
         date = dateparser.parse(
-            data.get(
+            message.get(
                 'value',
                 datetime.now().isoformat()
             )
@@ -75,13 +68,11 @@ class DirectorySnapshottingEventHandler(EventHandlerBase):
         )
         for provider in self.snapshot_providers.values():
             provider.restore_snapshot(date)
-        return data
 
-    def handle_exclude(self, data):
+    def handle_exclude(self, message):
-        exclude_unix_patterns = data['value']
+        exclude_unix_patterns = message['value']
         if not isinstance(exclude_unix_patterns, list):
             raise KeyError
 
         for provider in self.snapshot_providers.values():
             provider.exclude = exclude_unix_patterns
-        return data

tfw/components/snapshots/snapshot_provider.py

@@ -1,6 +1,3 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
 import re
 from subprocess import run, CalledProcessError, PIPE
 from getpass import getuser

tfw/components/terminal/__init__.py

@@ -0,0 +1,3 @@
+from .terminal_handler import TerminalHandler
+from .terminal_commands_handler import TerminalCommandsHandler
+from .commands_equal import CommandsEqual

tfw/components/terminal/commands_equal.py

@@ -1,10 +1,7 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
 from shlex import split
 from re import search
 
-from tfw.decorators.lazy_property import lazy_property
+from tfw.internals.lazy import lazy_property
 
 
 class CommandsEqual:

tfw/components/terminal/history_monitor.py

@@ -1,30 +1,12 @@
-# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
-# All Rights Reserved. See LICENSE file for details.
-
-from os.path import dirname
 from re import findall
 from re import compile as compileregex
 from abc import ABC, abstractmethod
 
-from watchdog.events import PatternMatchingEventHandler
+from tfw.internals.networking import Intent
-
+from tfw.internals.inotify import InotifyObserver
-from tfw.mixins.callback_mixin import CallbackMixin
-from tfw.mixins.observer_mixin import ObserverMixin
-from tfw.decorators.rate_limiter import RateLimiter
 
 
-class CallbackEventHandler(PatternMatchingEventHandler, ABC):
+class HistoryMonitor(ABC, InotifyObserver):
-    def __init__(self, files, *callbacks):
-        super().__init__(files)
-        self.callbacks = callbacks
-
-    @RateLimiter(rate_per_second=2)
-    def on_modified(self, event):
-        for callback in self.callbacks:
-            callback()
-
-
-class HistoryMonitor(CallbackMixin, ObserverMixin, ABC):
     """
     Abstract class capable of monitoring and parsing a history file such as
     bash HISTFILEs. Monitoring means detecting when the file was changed and
@@ -36,29 +18,30 @@ class HistoryMonitor(CallbackMixin, ObserverMixin, ABC):
     command pattern property and optionally the sanitize_command method.
     See examples below.
     """
-    def __init__(self, histfile):
+    def __init__(self, uplink, histfile):
         self.histfile = histfile
-        self._history = []
+        self.history = []
-        self._last_length = len(self._history)
+        self._last_length = len(self.history)
-        self.observer.schedule(
+        self.uplink = uplink
-            CallbackEventHandler(
+        super().__init__(self.histfile)
-                [self.histfile],
-                self._fetch_history,
-                self._invoke_callbacks
-            ),
-            dirname(self.histfile)
-        )
 
     @property
-    def history(self):
+    @abstractmethod
-        return self._history
+    def domain(self):
+        raise NotImplementedError()
+
+    def on_modified(self, event):
+        self._fetch_history()
+        if self._last_length < len(self.history):
+            for command in self.history[self._last_length:]:
+                self.send_message(command)
 
     def _fetch_history(self):
-        self._last_length = len(self._history)
+        self._last_length = len(self.history)
         with open(self.histfile, 'r') as ifile:
             pattern = compileregex(self.command_pattern)
             data = ifile.read()
-            self._history = [
+            self.history = [
                 self.sanitize_command(command)
                 for command in findall(pattern, data)
             ]
@@ -72,9 +55,11 @@ class HistoryMonitor(CallbackMixin, ObserverMixin, ABC):
         # pylint: disable=no-self-use
         return command
 
-    def _invoke_callbacks(self):
+    def send_message(self, command):
-        if self._last_length < len(self._history):
+        self.uplink.send_message({
-            self._execute_callbacks(self.history)
+            'key': f'history.{self.domain}',
+            'command': command
+        }, intent=Intent.EVENT)
 
 
 class BashMonitor(HistoryMonitor):
@@ -87,6 +72,10 @@ class BashMonitor(HistoryMonitor):
     shopt -s histappend
     unset HISTCONTROL
     """
+    @property
+    def domain(self):
+        return 'bash'
+
     @property
     def command_pattern(self):
         return r'.+'
@@ -100,6 +89,10 @@ class GDBMonitor(HistoryMonitor):
     HistoryMonitor to monitor GDB sessions.
     For this to work "set trace-commands on" must be set in GDB.
     """
+    @property
+    def domain(self):
+        return 'gdb'
+
     @property
     def command_pattern(self):
         return r'(?<=\n)\+(.+)\n'