mirror of
https://github.com/avatao-content/baseimage-tutorial-framework
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98 lines
2.6 KiB
Python
98 lines
2.6 KiB
Python
from re import findall
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from re import compile as compileregex
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from abc import ABC, abstractmethod
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from tfw.internals.inotify import InotifyObserver
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class HistoryMonitor(ABC, InotifyObserver):
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"""
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Abstract class capable of monitoring and parsing a history file such as
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bash HISTFILEs. Monitoring means detecting when the file was changed and
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notifying subscribers about new content in the file.
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This is useful for monitoring CLI sessions.
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To specify a custom HistoryMonitor inherit from this class and override the
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command pattern property and optionally the sanitize_command method.
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See examples below.
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"""
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def __init__(self, uplink, histfile):
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self.histfile = histfile
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self.history = []
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self._last_length = len(self.history)
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self.uplink = uplink
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super().__init__(self.histfile)
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@property
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@abstractmethod
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def domain(self):
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raise NotImplementedError()
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def on_modified(self, event):
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self._fetch_history()
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if self._last_length < len(self.history):
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for command in self.history[self._last_length:]:
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self.send_message(command)
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def _fetch_history(self):
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self._last_length = len(self.history)
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with open(self.histfile, 'r') as ifile:
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pattern = compileregex(self.command_pattern)
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data = ifile.read()
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self.history = [
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self.sanitize_command(command)
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for command in findall(pattern, data)
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]
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@property
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@abstractmethod
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def command_pattern(self):
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raise NotImplementedError
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def sanitize_command(self, command):
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# pylint: disable=no-self-use
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return command
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def send_message(self, command):
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self.uplink.send_message({
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'key': f'history.{self.domain}',
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'value': command
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})
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class BashMonitor(HistoryMonitor):
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"""
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HistoryMonitor for monitoring bash CLI sessions.
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This requires the following to be set in bash
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(note that this is done automatically by TFW):
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PROMPT_COMMAND="history -a"
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shopt -s cmdhist
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shopt -s histappend
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unset HISTCONTROL
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"""
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@property
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def domain(self):
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return 'bash'
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@property
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def command_pattern(self):
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return r'.+'
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def sanitize_command(self, command):
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return command.strip()
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class GDBMonitor(HistoryMonitor):
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"""
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HistoryMonitor to monitor GDB sessions.
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For this to work "set trace-commands on" must be set in GDB.
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"""
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@property
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def domain(self):
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return 'gdb'
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@property
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def command_pattern(self):
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return r'(?<=\n)\+(.+)\n'
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