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# Copyright (C) 2010-2013 Aleksey Lim
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import sys
import json
import struct
import signal
import logging
import threading
from os.path import exists, dirname, basename
from sugar_network import toolkit
from sugar_network.toolkit import coroutine
_logger = logging.getLogger('pipe')
_pipe = None
_trace = None
def feedback(state, **event):
if _pipe is None:
return
event['state'] = state
event = json.dumps(event)
os.write(_pipe, struct.pack('i', len(event)))
os.write(_pipe, event)
def trace(message, *args):
global _trace
if _trace is None:
_trace = []
if args:
message = message % args
_logger.debug(message)
_trace.append(message)
def fork(callback, log_path=None, session=None, **kwargs):
fd_r, fd_w = os.pipe()
pid = os.fork()
if pid:
os.close(fd_w)
_logger.debug('Fork %s%r with %s pid', callback, kwargs, pid)
return _Pipe(pid, fd_r)
os.close(fd_r)
global _pipe
_pipe = fd_w
def thread_func():
environ = {}
if log_path:
environ['log_path'] = _setup_logging(log_path)
feedback('fork', session=session, environ=environ)
try:
callback(**kwargs)
except Exception, error:
feedback('failure', error_type=type(error).__name__,
error=str(error), environ={'trace': _trace})
_logger.exception('%r(%r) failed', callback, kwargs)
if session is None:
session = {}
# Avoid a mess with current thread coroutines
thread = threading.Thread(target=thread_func)
thread.start()
thread.join()
os.close(fd_w)
sys.stdout.flush()
sys.stderr.flush()
# pylint: disable-msg=W0212
os._exit(0)
class _Pipe(object):
def __init__(self, pid, fd):
self._pid = pid
self._fd = fd
self._session = {}
self._environ = {}
def fileno(self):
return self._fd
def read(self):
if self._fd is None:
return None
event = None
failed = False
event_length = os.read(self._fd, struct.calcsize('i'))
if event_length:
event_length = struct.unpack('i', event_length)[0]
event = json.loads(os.read(self._fd, event_length))
if 'session' in event:
self._session.update(event.pop('session'))
if 'environ' in event:
self._environ.update(event.pop('environ'))
failed = (event['state'] == 'failure')
if event is None or failed:
status = 0
try:
__, status = os.waitpid(self._pid, 0)
except OSError:
pass
if event is None:
failure = _decode_exit_failure(status)
if failure:
_logger.debug('Process %s failed: %s', self._pid, failure)
event = {'state': 'failure', 'error': failure}
failed = True
else:
_logger.debug('Process %s successfully exited', self._pid)
event = {'state': 'exit'}
os.close(self._fd)
self._fd = None
if failed:
event.update(self._environ)
event.update(self._session)
return event
def __iter__(self):
try:
while self._fd is not None:
coroutine.select([self._fd], [], [])
event = self.read()
if event is None:
break
yield event
finally:
if self._fd is not None:
_logger.debug('Kill %s process', self._pid)
os.kill(self._pid, signal.SIGTERM)
while self.read() is not None:
pass
def _decode_exit_failure(status):
failure = None
if os.WIFEXITED(status):
status = os.WEXITSTATUS(status)
if status:
failure = 'Exited with status %s' % status
elif os.WIFSIGNALED(status):
signum = os.WTERMSIG(status)
if signum not in (signal.SIGINT, signal.SIGKILL, signal.SIGTERM):
failure = 'Terminated by signal %s' % signum
else:
signum = os.WTERMSIG(status)
failure = 'Undefined status with signal %s' % signum
return failure
def _setup_logging(path):
log_dir = dirname(path)
if not exists(log_dir):
os.makedirs(log_dir)
path = toolkit.unique_filename(log_dir, basename(path) + '.log')
logfile = file(path, 'a+')
os.dup2(logfile.fileno(), sys.stdout.fileno())
os.dup2(logfile.fileno(), sys.stderr.fileno())
logfile.close()
toolkit.init_logging()
return path
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