mirror of
https://github.com/avatao-content/baseimage-tutorial-framework
synced 2024-11-21 21:41:32 +00:00
Merge branch 'pipeio'
This commit is contained in:
commit
f43c463692
@ -1,6 +1,6 @@
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pipeline:
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build:
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image: eu.gcr.io/avatao-public/docker:el7
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image: eu.gcr.io/avatao-challengestore/challenge-builder
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volumes:
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- /etc/docker:/etc/docker:ro
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- /root/.docker:/root/.docker:ro
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@ -10,6 +10,7 @@ RUN curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
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supervisor \
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libzmq5 \
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nginx \
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jq \
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gettext-base &&\
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rm -rf /var/lib/apt/lists/* &&\
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ln -sf /bin/bash /bin/sh
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@ -10,3 +10,5 @@ from .terminal_commands import TerminalCommands
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from .log_monitoring_event_handler import LogMonitoringEventHandler
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from .fsm_managing_event_handler import FSMManagingEventHandler
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from .snapshot_provider import SnapshotProvider
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from .pipe_io_event_handler import PipeIOEventHandlerBase, PipeIOEventHandler, PipeIOServer
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from .pipe_io_event_handler import TransformerPipeIOEventHandler, CommandEventHandler
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143
lib/tfw/components/pipe_io_event_handler.py
Normal file
143
lib/tfw/components/pipe_io_event_handler.py
Normal file
@ -0,0 +1,143 @@
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from abc import abstractmethod
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from json import loads, dumps
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from subprocess import run, PIPE, Popen
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from functools import partial
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from os import getpgid, killpg
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from os.path import join
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from signal import SIGTERM
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from secrets import token_urlsafe
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from threading import Thread
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from contextlib import suppress
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from tfw import EventHandlerBase
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from tfw.config.logs import logging
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from .pipe_io_server import PipeIOServer, terminate_process_on_failure
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LOG = logging.getLogger(__name__)
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DEFAULT_PERMISSIONS = 0o600
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class PipeIOEventHandlerBase(EventHandlerBase):
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def __init__(self, key, in_pipe_path, out_pipe_path, permissions=DEFAULT_PERMISSIONS):
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super().__init__(key)
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self.pipe_io = CallbackPipeIOServer(
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in_pipe_path,
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out_pipe_path,
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self.handle_pipe_event,
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permissions
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)
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self.pipe_io.start()
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@abstractmethod
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def handle_pipe_event(self, message_bytes):
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raise NotImplementedError()
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def cleanup(self):
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self.pipe_io.stop()
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class CallbackPipeIOServer(PipeIOServer):
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def __init__(self, in_pipe_path, out_pipe_path, callback, permissions):
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super().__init__(in_pipe_path, out_pipe_path, permissions)
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self.callback = callback
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def handle_message(self, message):
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try:
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self.callback(message)
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except: # pylint: disable=bare-except
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LOG.exception('Failed to handle message %s from pipe %s!', message, self.in_pipe)
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class PipeIOEventHandler(PipeIOEventHandlerBase):
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def handle_event(self, message):
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json_bytes = dumps(message).encode()
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self.pipe_io.send_message(json_bytes)
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def handle_pipe_event(self, message_bytes):
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json = loads(message_bytes)
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self.server_connector.send(json)
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class TransformerPipeIOEventHandler(PipeIOEventHandlerBase):
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# pylint: disable=too-many-arguments
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def __init__(
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self, key, in_pipe_path, out_pipe_path,
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transform_in_cmd, transform_out_cmd,
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permissions=DEFAULT_PERMISSIONS
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):
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self._transform_in = partial(self._transform_message, transform_in_cmd)
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self._transform_out = partial(self._transform_message, transform_out_cmd)
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super().__init__(key, in_pipe_path, out_pipe_path, permissions)
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@staticmethod
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def _transform_message(transform_cmd, message):
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proc = run(
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transform_cmd,
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input=message,
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stdout=PIPE,
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stderr=PIPE,
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shell=True
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)
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if proc.returncode == 0:
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return proc.stdout
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raise ValueError(f'Transforming message {message} failed!')
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def handle_event(self, message):
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json_bytes = dumps(message).encode()
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transformed_bytes = self._transform_out(json_bytes)
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if transformed_bytes:
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self.pipe_io.send_message(transformed_bytes)
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def handle_pipe_event(self, message_bytes):
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transformed_bytes = self._transform_in(message_bytes)
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if transformed_bytes:
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json_message = loads(transformed_bytes)
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self.server_connector.send(json_message)
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class CommandEventHandler(PipeIOEventHandler):
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def __init__(self, key, command, permissions=DEFAULT_PERMISSIONS):
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super().__init__(
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key,
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self._generate_tempfilename(),
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self._generate_tempfilename(),
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permissions
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)
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self._proc_stdin = open(self.pipe_io.out_pipe, 'rb')
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self._proc_stdout = open(self.pipe_io.in_pipe, 'wb')
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self._proc = Popen(
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command, shell=True, executable='/bin/bash',
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stdin=self._proc_stdin, stdout=self._proc_stdout, stderr=PIPE,
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start_new_session=True
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)
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self._monitor_proc_thread = self._start_monitor_proc()
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def _generate_tempfilename(self):
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# pylint: disable=no-self-use
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random_filename = partial(token_urlsafe, 10)
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return join('/tmp', f'{type(self).__name__}.{random_filename()}')
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def _start_monitor_proc(self):
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thread = Thread(target=self._monitor_proc, daemon=True)
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thread.start()
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return thread
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@terminate_process_on_failure
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def _monitor_proc(self):
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return_code = self._proc.wait()
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if return_code == -int(SIGTERM):
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# supervisord asked the program to terminate, this is fine
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return
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if return_code != 0:
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_, stderr = self._proc.communicate()
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raise RuntimeError(f'Subprocess failed ({return_code})! Stderr:\n{stderr.decode()}')
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def cleanup(self):
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with suppress(ProcessLookupError):
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process_group_id = getpgid(self._proc.pid)
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killpg(process_group_id, SIGTERM)
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self._proc_stdin.close()
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self._proc_stdout.close()
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super().cleanup()
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2
lib/tfw/components/pipe_io_server/__init__.py
Normal file
2
lib/tfw/components/pipe_io_server/__init__.py
Normal file
@ -0,0 +1,2 @@
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from .pipe_io_server import PipeIOServer
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from .terminate_process_on_failure import terminate_process_on_failure
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27
lib/tfw/components/pipe_io_server/deque.py
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27
lib/tfw/components/pipe_io_server/deque.py
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from collections import deque
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from threading import Lock, Condition
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class Deque:
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def __init__(self):
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self._queue = deque()
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self._mutex = Lock()
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self._not_empty = Condition(self._mutex)
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def pop(self):
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with self._mutex:
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while not self._queue:
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self._not_empty.wait()
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return self._queue.pop()
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def push(self, item):
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self._push(item, self._queue.appendleft)
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def push_front(self, item):
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self._push(item, self._queue.append)
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def _push(self, item, put_method):
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with self._mutex:
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put_method(item)
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self._not_empty.notify()
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16
lib/tfw/components/pipe_io_server/pipe.py
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16
lib/tfw/components/pipe_io_server/pipe.py
Normal file
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from os import mkfifo, remove, chmod
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from os.path import exists
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class Pipe:
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def __init__(self, path):
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self.path = path
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def recreate(self, permissions):
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self.remove()
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mkfifo(self.path)
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chmod(self.path, permissions) # use chmod to ignore umask
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def remove(self):
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if exists(self.path):
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remove(self.path)
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73
lib/tfw/components/pipe_io_server/pipe_io_server.py
Normal file
73
lib/tfw/components/pipe_io_server/pipe_io_server.py
Normal file
@ -0,0 +1,73 @@
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from abc import ABC, abstractmethod
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from threading import Thread, Event
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from typing import Callable
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from .pipe_reader_thread import PipeReaderThread
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from .pipe_writer_thread import PipeWriterThread
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from .pipe import Pipe
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from .terminate_process_on_failure import terminate_process_on_failure
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class PipeIOServer(ABC, Thread):
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def __init__(self, in_pipe=None, out_pipe=None, permissions=0o600):
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super().__init__(daemon=True)
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self._in_pipe, self._out_pipe = in_pipe, out_pipe
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self._create_pipes(permissions)
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self._stop_event = Event()
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self._reader_thread, self._writer_thread = self._create_io_threads()
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self._io_threads = (self._reader_thread, self._writer_thread)
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self._on_stop = lambda: None
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def _create_pipes(self, permissions):
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Pipe(self.in_pipe).recreate(permissions)
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Pipe(self.out_pipe).recreate(permissions)
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@property
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def in_pipe(self):
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return self._in_pipe
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@property
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def out_pipe(self):
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return self._out_pipe
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def _create_io_threads(self):
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reader_thread = PipeReaderThread(self.in_pipe, self._stop_event, self.handle_message)
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writer_thread = PipeWriterThread(self.out_pipe, self._stop_event)
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return reader_thread, writer_thread
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@abstractmethod
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def handle_message(self, message):
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raise NotImplementedError()
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def send_message(self, message):
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self._writer_thread.write(message)
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@terminate_process_on_failure
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def run(self):
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for thread in self._io_threads:
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thread.start()
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self._stop_event.wait()
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self._stop_threads()
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def stop(self):
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self._stop_event.set()
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if self.is_alive():
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self.join()
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def _stop_threads(self):
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for thread in self._io_threads:
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if thread.is_alive():
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thread.stop()
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Pipe(self.in_pipe).remove()
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Pipe(self.out_pipe).remove()
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self._on_stop()
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def _set_on_stop(self, value):
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if not isinstance(value, Callable):
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raise ValueError("Supplied object is not callable!")
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self._on_stop = value
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on_stop = property(fset=_set_on_stop)
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def wait(self):
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self._stop_event.wait()
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44
lib/tfw/components/pipe_io_server/pipe_reader_thread.py
Normal file
44
lib/tfw/components/pipe_io_server/pipe_reader_thread.py
Normal file
@ -0,0 +1,44 @@
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from contextlib import suppress
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from os import open as osopen
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from os import write, close, O_WRONLY, O_NONBLOCK
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from threading import Thread
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from .terminate_process_on_failure import terminate_process_on_failure
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class PipeReaderThread(Thread):
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eof = b''
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stop_sequence = b'stop_reading\n'
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def __init__(self, pipe_path, stop_event, message_handler):
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super().__init__(daemon=True)
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self._message_handler = message_handler
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self._pipe_path = pipe_path
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self._stop_event = stop_event
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@terminate_process_on_failure
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def run(self):
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with self._open() as pipe:
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while True:
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message = pipe.readline()
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if message == self.stop_sequence:
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self._stop_event.set()
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break
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if message == self.eof:
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self._open().close()
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continue
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self._message_handler(message[:-1])
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def _open(self):
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return open(self._pipe_path, 'rb')
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def stop(self):
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while self.is_alive():
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self._unblock()
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self.join()
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def _unblock(self):
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with suppress(OSError):
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fd = osopen(self._pipe_path, O_WRONLY | O_NONBLOCK)
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write(fd, self.stop_sequence)
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close(fd)
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50
lib/tfw/components/pipe_io_server/pipe_writer_thread.py
Normal file
50
lib/tfw/components/pipe_io_server/pipe_writer_thread.py
Normal file
@ -0,0 +1,50 @@
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from contextlib import suppress
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from os import O_NONBLOCK, O_RDONLY, close
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from os import open as osopen
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from threading import Thread
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from .terminate_process_on_failure import terminate_process_on_failure
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from .deque import Deque
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class PipeWriterThread(Thread):
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def __init__(self, pipe_path, stop_event):
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super().__init__(daemon=True)
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self._pipe_path = pipe_path
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self._stop_event = stop_event
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self._write_queue = Deque()
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def write(self, message):
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self._write_queue.push(message)
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@terminate_process_on_failure
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def run(self):
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with self._open() as pipe:
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while True:
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message = self._write_queue.pop()
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if message is None:
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self._stop_event.set()
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break
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try:
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pipe.write(message + b'\n')
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pipe.flush()
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except BrokenPipeError:
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try: # pipe was reopened, close() flushed the message
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pipe.close()
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except BrokenPipeError: # close() discarded the message
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self._write_queue.push_front(message)
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pipe = self._open()
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def _open(self):
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return open(self._pipe_path, 'wb')
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def stop(self):
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while self.is_alive():
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self._unblock()
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self.join()
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def _unblock(self):
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with suppress(OSError):
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fd = osopen(self._pipe_path, O_RDONLY | O_NONBLOCK)
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self._write_queue.push_front(None)
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close(fd)
|
@ -0,0 +1,15 @@
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from functools import wraps
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from os import kill, getpid
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from signal import SIGTERM
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from traceback import print_exc
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def terminate_process_on_failure(fun):
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@wraps(fun)
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def wrapper(*args, **kwargs):
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try:
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return fun(*args, **kwargs)
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except: # pylint: disable=bare-except
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print_exc()
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kill(getpid(), SIGTERM)
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return wrapper
|
@ -2,6 +2,8 @@
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# All Rights Reserved. See LICENSE file for details.
|
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|
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from abc import ABC, abstractmethod
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from inspect import currentframe
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from typing import Iterable
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|
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from tfw.networking.event_handlers import ServerConnector
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from tfw.crypto import message_checksum, KeyManager, verify_message
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@ -19,7 +21,12 @@ class EventHandlerBase(ABC):
|
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"""
|
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def __init__(self, key):
|
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self.server_connector = ServerConnector()
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self.keys = [key]
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self.keys = []
|
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if isinstance(key, str):
|
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self.keys.append(key)
|
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elif isinstance(key, Iterable):
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self.keys = list(key)
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self.subscribe(*self.keys)
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self.server_connector.register_callback(self.event_handler_callback)
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|
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@ -54,6 +61,8 @@ class EventHandlerBase(ABC):
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subscribed to 'fsm' will receive 'fsm_update'
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messages as well.
|
||||
"""
|
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if '' in self.keys:
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return True
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return message['key'] in self.keys
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|
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def dispatch_handling(self, message):
|
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@ -105,6 +114,18 @@ class EventHandlerBase(ABC):
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"""
|
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pass
|
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|
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@classmethod
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def get_local_instances(cls):
|
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frame = currentframe()
|
||||
if frame is None:
|
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raise EnvironmentError('inspect.currentframe() is not supported!')
|
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|
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locals_values = frame.f_back.f_locals.values()
|
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return {
|
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instance for instance in locals_values
|
||||
if isinstance(instance, cls)
|
||||
}
|
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|
||||
|
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class FSMAwareEventHandler(EventHandlerBase, ABC):
|
||||
# pylint: disable=abstract-method
|
||||
|
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