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"""
Helper class to read output of a subprocess.
Used to avoid deadlocks from the pipe buffer filling up and blocking the subprocess while it's
being waited on.
"""
from __future__ import absolute_import
import threading
class LoggerPipe(threading.Thread): # pylint: disable=too-many-instance-attributes
"""Asynchronously reads the output of a subprocess and sends it to a logger."""
# The start() and join() methods are not intended to be called directly on the LoggerPipe
# instance. Since we override them for that effect, the super's version are preserved here.
__start = threading.Thread.start
__join = threading.Thread.join
def __init__(self, logger, level, pipe_out):
"""Initialize the LoggerPipe with the specified arguments."""
threading.Thread.__init__(self)
# Main thread should not call join() when exiting
self.daemon = True
self.__logger = logger
self.__level = level
self.__pipe_out = pipe_out
self.__lock = threading.Lock()
self.__condition = threading.Condition(self.__lock)
self.__started = False
self.__finished = False
LoggerPipe.__start(self)
def start(self):
"""Start not implemented."""
raise NotImplementedError("start should not be called directly")
def run(self):
"""Read the output from 'pipe_out' and logs each line to 'logger'."""
with self.__lock:
self.__started = True
self.__condition.notify_all()
# Close the pipe when finished reading all of the output.
with self.__pipe_out:
# Avoid buffering the output from the pipe.
for line in iter(self.__pipe_out.readline, b""):
# Replace null bytes in the output of the subprocess with a literal backslash ('\')
# followed by a literal zero ('0') so tools like grep don't treat resmoke.py's
# output as binary data.
line = line.replace(b"\0", b"\\0")
# Convert the output of the process from a bytestring to a UTF-8 string, and replace
# any characters that cannot be decoded with the official Unicode replacement
# character, U+FFFD. The log messages of MongoDB processes are not always valid
# UTF-8 sequences. See SERVER-7506.
line = line.decode("utf-8", "replace")
self.__logger.log(self.__level, line.rstrip())
with self.__lock:
self.__finished = True
self.__condition.notify_all()
def join(self, timeout=None):
"""Join not implemented."""
raise NotImplementedError("join should not be called directly")
def wait_until_started(self):
"""Wait until started."""
with self.__lock:
while not self.__started:
self.__condition.wait()
def wait_until_finished(self):
"""Wait until finished."""
with self.__lock:
while not self.__finished:
self.__condition.wait()
# No need to pass a timeout to join() because the thread should already be done after
# notifying us it has finished reading output from the pipe.
LoggerPipe.__join(self) # Tidy up the started thread.
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