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# Copyright (c) 2023 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "cimple" project.
# For details, see https://github.com/egor-tensin/cimple.
# Distributed under the MIT License.
from contextlib import contextmanager
import logging
import os
import shutil
import subprocess
from threading import Event, Lock, Thread
_COMMON_ARGS = {
'text': True,
'stdin': subprocess.DEVNULL,
'stdout': subprocess.PIPE,
'stderr': subprocess.STDOUT,
}
def run(*args, **kwargs):
try:
return subprocess.run(list(args), check=True, **_COMMON_ARGS, **kwargs)
except subprocess.CalledProcessError as e:
logging.error('Command %s exited with code %s', e.cmd, e.returncode)
logging.error('Output:\n%s', e.output)
raise
class LoggingEvent(Event):
def __init__(self, timeout=10):
self.timeout = timeout
super().__init__()
def log_line_matches(self, line):
return False
def wait(self):
if not super().wait(self.timeout):
raise RuntimeError('timed out while waiting for an event')
class LoggingThread(Thread):
def __init__(self, process, events=None):
self.process = process
self.events_lock = Lock()
if events is None:
events = []
self.events = events
super().__init__(target=lambda: self.process_output_lines())
self.start()
def add_event(self, event):
with self.events_lock:
self.events.append(event)
def process_output_lines(self):
for line in self.process.stdout:
line = line.removesuffix('\n')
logging.info('%s: %s', self.process.log_id, line)
with self.events_lock:
for event in self.events:
if event.is_set():
continue
if not event.log_line_matches(line):
continue
event.set()
self.events = [event for event in self.events if not event.is_set()]
class CmdLine:
@staticmethod
def which(binary):
if os.path.split(binary)[0]:
# shutil.which('bin/bash') doesn't work.
return os.path.abspath(binary)
path = shutil.which(binary)
if path is None:
raise RuntimeError("couldn't find a binary: " + binary)
return path
def __init__(self, binary, *args, name=None):
binary = self.which(binary)
argv = [binary] + list(args)
self.binary = binary
self.argv = argv
if name is None:
name = os.path.basename(binary)
self.process_name = name
def log_line_means_process_ready(self, line):
return True
@classmethod
def wrap(cls, outer, inner):
return cls(outer.argv[0], *outer.argv[1:], *inner.argv, name=inner.process_name)
def log_process_start(self):
if len(self.argv) > 1:
logging.info('Executing binary %s with arguments: %s', self.binary, ' '.join(self.argv[1:]))
else:
logging.info('Executing binary %s', self.binary)
class LoggingEventProcessReady(LoggingEvent):
def __init__(self, process):
self.process = process
super().__init__()
def set(self):
logging.info('Process %s is ready', self.process.log_id)
super().set()
def log_line_matches(self, line):
return self.process.cmd_line.log_line_means_process_ready(line)
class Process(subprocess.Popen):
def __init__(self, cmd_line):
self.cmd_line = cmd_line
super().__init__(cmd_line.argv, **_COMMON_ARGS)
logging.info('Process %s has started', self.log_id)
ready_event = LoggingEventProcessReady(self)
self.logger = LoggingThread(self, [ready_event])
ready_event.wait()
@property
def log_id(self):
return f'{self.pid}/{self.cmd_line.process_name}'
def __exit__(self, *args):
try:
self.shut_down()
self.logger.join()
except Exception as e:
logging.exception(e)
# Postpone closing the pipes until after the logging thread is finished
# so that it doesn't attempt to read from closed descriptors.
super().__exit__(*args)
SHUT_DOWN_TIMEOUT_SEC = 3
def shut_down(self):
ec = self.poll()
if ec is not None:
return
logging.info('Terminating process %s', self.log_id)
self.terminate()
try:
self.wait(timeout=Process.SHUT_DOWN_TIMEOUT_SEC)
return
except subprocess.TimeoutExpired:
pass
logging.info('Process %s failed to terminate in time, killing it', self.log_id)
self.kill()
self.wait(timeout=Process.SHUT_DOWN_TIMEOUT_SEC)
class Runner:
@staticmethod
def unbuffered():
return CmdLine('stdbuf', '-o0')
def __init__(self):
self.wrappers = []
self.add_wrapper(self.unbuffered())
def add_wrapper(self, cmd_line):
self.wrappers.append(cmd_line)
def _wrap(self, cmd_line):
for wrapper in self.wrappers:
cmd_line = cmd_line.wrap(wrapper, cmd_line)
return cmd_line
def run(self, cmd_line):
cmd_line = self._wrap(cmd_line)
cmd_line.log_process_start()
result = run(*cmd_line.argv)
return result.returncode, result.stdout
@contextmanager
def run_async(self, cmd_line):
cmd_line = self._wrap(cmd_line)
cmd_line.log_process_start()
with Process(cmd_line) as process:
yield process
class CmdLineRunner:
def __init__(self, runner, binary, *args):
self.runner = runner
self.binary = binary
self.args = list(args)
def _build(self, *args):
return CmdLine(self.binary, *self.args, *args)
def run(self, *args):
return self.runner.run(self._build(*args))
def run_async(self, *args):
return self.runner.run_async(self._build(*args))
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