baseimage-tutorial-framework/lib/tfw/components/source_code_event_handler.py

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from os.path import splitext, isfile, join, relpath
from glob import glob
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from tfw.components.mixins import SupervisorMixin
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from tfw.event_handler_base import EventHandlerBase
from tfw.components.directory_monitor import DirectoryMonitor
from tfw.config.logs import logging
log = logging.getLogger(__name__)
class FileManager:
def __init__(self, working_directory, selected_file=None):
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self.exclude = ['__pycache__']
self._workdir = working_directory
self.filename = selected_file or self._relpath(self.files[0])
def select_file(self, filename):
if not filename in self.files:
raise EnvironmentError('No such file in workdir!')
self.filename = filename
@property
def files(self):
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return [self._relpath(file) for file in glob(join(self._workdir, '**/*'), recursive=True)
if isfile(file) and
not any(word in file for word in self.exclude)]
@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 _filepath(self, filename):
return join(self._workdir, filename)
def _relpath(self, filename):
return relpath(self._filepath(filename), start=self._workdir)
class SourceCodeEventHandler(EventHandlerBase, SupervisorMixin):
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def __init__(self, anchor, directory, process_name, selected_file=None):
super().__init__(anchor)
self.filemanager = FileManager(directory, selected_file=selected_file)
self.process_name = process_name
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self.commands = {
'read': self.read,
'write': self.write,
'select': self.select
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}
self.monitor = DirectoryMonitor(directory)
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self.monitor.watch() # This runs on a separate thread
def read(self, data):
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: data['content'] = 'Failed to read file :('
return data
def write(self, data):
with self.monitor.pauser:
try: self.filemanager.file_contents = data['content']
except Exception: log.exception('Error writing file!')
self.restart_process()
return data
def select(self, data):
try: self.filemanager.select_file(data['filename'])
except EnvironmentError: log.exception('Failed to select file "{}"'.format(data['filename']))
return data
def attach_fileinfo(self, data):
data['filename'] = self.filemanager.filename
data['files'] = self.filemanager.files
def handle_event(self, anchor, data_json):
data = data_json['data']
data_json['data'] = self.commands[data['command']](data)
self.attach_fileinfo(data)
return data_json
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def cleanup(self):
self.monitor.stop()