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Diffstat (limited to 'testing/mozharness/mozprocess/processhandler.py')
| -rw-r--r-- | testing/mozharness/mozprocess/processhandler.py | 921 |
1 files changed, 921 insertions, 0 deletions
diff --git a/testing/mozharness/mozprocess/processhandler.py b/testing/mozharness/mozprocess/processhandler.py new file mode 100644 index 0000000000..b89e17eb03 --- /dev/null +++ b/testing/mozharness/mozprocess/processhandler.py @@ -0,0 +1,921 @@ +# This Source Code Form is subject to the terms of the Mozilla Public +# License, v. 2.0. If a copy of the MPL was not distributed with this file, +# You can obtain one at http://mozilla.org/MPL/2.0/. + +import os +import select +import signal +import subprocess +import sys +import threading +import time +import traceback +from Queue import Queue +from datetime import datetime, timedelta +__all__ = ['ProcessHandlerMixin', 'ProcessHandler'] + +# Set the MOZPROCESS_DEBUG environment variable to 1 to see some debugging output +MOZPROCESS_DEBUG = os.getenv("MOZPROCESS_DEBUG") + +# We dont use mozinfo because it is expensive to import, see bug 933558. +isWin = os.name == "nt" +isPosix = os.name == "posix" # includes MacOS X + +if isWin: + import ctypes, ctypes.wintypes, msvcrt + from ctypes import sizeof, addressof, c_ulong, byref, POINTER, WinError, c_longlong + import winprocess + from qijo import JobObjectAssociateCompletionPortInformation,\ + JOBOBJECT_ASSOCIATE_COMPLETION_PORT, JobObjectExtendedLimitInformation,\ + JOBOBJECT_BASIC_LIMIT_INFORMATION, JOBOBJECT_EXTENDED_LIMIT_INFORMATION, IO_COUNTERS + +class ProcessHandlerMixin(object): + """ + A class for launching and manipulating local processes. + + :param cmd: command to run. May be a string or a list. If specified as a list, the first element will be interpreted as the command, and all additional elements will be interpreted as arguments to that command. + :param args: list of arguments to pass to the command (defaults to None). Must not be set when `cmd` is specified as a list. + :param cwd: working directory for command (defaults to None). + :param env: is the environment to use for the process (defaults to os.environ). + :param ignore_children: causes system to ignore child processes when True, defaults to False (which tracks child processes). + :param kill_on_timeout: when True, the process will be killed when a timeout is reached. When False, the caller is responsible for killing the process. Failure to do so could cause a call to wait() to hang indefinitely. (Defaults to True.) + :param processOutputLine: function to be called for each line of output produced by the process (defaults to None). + :param onTimeout: function to be called when the process times out. + :param onFinish: function to be called when the process terminates normally without timing out. + :param kwargs: additional keyword args to pass directly into Popen. + + NOTE: Child processes will be tracked by default. If for any reason + we are unable to track child processes and ignore_children is set to False, + then we will fall back to only tracking the root process. The fallback + will be logged. + """ + + class Process(subprocess.Popen): + """ + Represents our view of a subprocess. + It adds a kill() method which allows it to be stopped explicitly. + """ + + MAX_IOCOMPLETION_PORT_NOTIFICATION_DELAY = 180 + MAX_PROCESS_KILL_DELAY = 30 + + def __init__(self, + args, + bufsize=0, + executable=None, + stdin=None, + stdout=None, + stderr=None, + preexec_fn=None, + close_fds=False, + shell=False, + cwd=None, + env=None, + universal_newlines=False, + startupinfo=None, + creationflags=0, + ignore_children=False): + + # Parameter for whether or not we should attempt to track child processes + self._ignore_children = ignore_children + + if not self._ignore_children and not isWin: + # Set the process group id for linux systems + # Sets process group id to the pid of the parent process + # NOTE: This prevents you from using preexec_fn and managing + # child processes, TODO: Ideally, find a way around this + def setpgidfn(): + os.setpgid(0, 0) + preexec_fn = setpgidfn + + try: + subprocess.Popen.__init__(self, args, bufsize, executable, + stdin, stdout, stderr, + preexec_fn, close_fds, + shell, cwd, env, + universal_newlines, startupinfo, creationflags) + except OSError, e: + print >> sys.stderr, args + raise + + def __del__(self, _maxint=sys.maxint): + if isWin: + if self._handle: + if hasattr(self, '_internal_poll'): + self._internal_poll(_deadstate=_maxint) + else: + self.poll(_deadstate=sys.maxint) + if self._handle or self._job or self._io_port: + self._cleanup() + else: + subprocess.Popen.__del__(self) + + def kill(self, sig=None): + self.returncode = 0 + if isWin: + if not self._ignore_children and self._handle and self._job: + winprocess.TerminateJobObject(self._job, winprocess.ERROR_CONTROL_C_EXIT) + self.returncode = winprocess.GetExitCodeProcess(self._handle) + elif self._handle: + err = None + try: + winprocess.TerminateProcess(self._handle, winprocess.ERROR_CONTROL_C_EXIT) + except: + err = "Could not terminate process" + self.returncode = winprocess.GetExitCodeProcess(self._handle) + self._cleanup() + if err is not None: + raise OSError(err) + else: + sig = sig or signal.SIGKILL + if not self._ignore_children: + try: + os.killpg(self.pid, sig) + except BaseException, e: + if getattr(e, "errno", None) != 3: + # Error 3 is "no such process", which is ok + print >> sys.stdout, "Could not kill process, could not find pid: %s, assuming it's already dead" % self.pid + else: + os.kill(self.pid, sig) + self.returncode = -sig + + self._cleanup() + return self.returncode + + def wait(self): + """ Popen.wait + Called to wait for a running process to shut down and return + its exit code + Returns the main process's exit code + """ + # This call will be different for each OS + self.returncode = self._wait() + self._cleanup() + return self.returncode + + """ Private Members of Process class """ + + if isWin: + # Redefine the execute child so that we can track process groups + def _execute_child(self, *args_tuple): + # workaround for bug 950894 + if sys.hexversion < 0x02070600: # prior to 2.7.6 + (args, executable, preexec_fn, close_fds, + cwd, env, universal_newlines, startupinfo, + creationflags, shell, + p2cread, p2cwrite, + c2pread, c2pwrite, + errread, errwrite) = args_tuple + to_close = set() + else: # 2.7.6 and later + (args, executable, preexec_fn, close_fds, + cwd, env, universal_newlines, startupinfo, + creationflags, shell, to_close, + p2cread, p2cwrite, + c2pread, c2pwrite, + errread, errwrite) = args_tuple + if not isinstance(args, basestring): + args = subprocess.list2cmdline(args) + + # Always or in the create new process group + creationflags |= winprocess.CREATE_NEW_PROCESS_GROUP + + if startupinfo is None: + startupinfo = winprocess.STARTUPINFO() + + if None not in (p2cread, c2pwrite, errwrite): + startupinfo.dwFlags |= winprocess.STARTF_USESTDHANDLES + startupinfo.hStdInput = int(p2cread) + startupinfo.hStdOutput = int(c2pwrite) + startupinfo.hStdError = int(errwrite) + if shell: + startupinfo.dwFlags |= winprocess.STARTF_USESHOWWINDOW + startupinfo.wShowWindow = winprocess.SW_HIDE + comspec = os.environ.get("COMSPEC", "cmd.exe") + args = comspec + " /c " + args + + # determine if we can create create a job + canCreateJob = winprocess.CanCreateJobObject() + + # Ensure we write a warning message if we are falling back + if not canCreateJob and not self._ignore_children: + # We can't create job objects AND the user wanted us to + # Warn the user about this. + print >> sys.stderr, "ProcessManager UNABLE to use job objects to manage child processes" + + # set process creation flags + creationflags |= winprocess.CREATE_SUSPENDED + creationflags |= winprocess.CREATE_UNICODE_ENVIRONMENT + if canCreateJob: + creationflags |= winprocess.CREATE_BREAKAWAY_FROM_JOB + else: + # Since we've warned, we just log info here to inform you + # of the consequence of setting ignore_children = True + print "ProcessManager NOT managing child processes" + + # create the process + hp, ht, pid, tid = winprocess.CreateProcess( + executable, args, + None, None, # No special security + 1, # Must inherit handles! + creationflags, + winprocess.EnvironmentBlock(env), + cwd, startupinfo) + self._child_created = True + self._handle = hp + self._thread = ht + self.pid = pid + self.tid = tid + + if not self._ignore_children and canCreateJob: + try: + # We create a new job for this process, so that we can kill + # the process and any sub-processes + # Create the IO Completion Port + self._io_port = winprocess.CreateIoCompletionPort() + self._job = winprocess.CreateJobObject() + + # Now associate the io comp port and the job object + joacp = JOBOBJECT_ASSOCIATE_COMPLETION_PORT(winprocess.COMPKEY_JOBOBJECT, + self._io_port) + winprocess.SetInformationJobObject(self._job, + JobObjectAssociateCompletionPortInformation, + addressof(joacp), + sizeof(joacp) + ) + + # Allow subprocesses to break away from us - necessary for + # flash with protected mode + jbli = JOBOBJECT_BASIC_LIMIT_INFORMATION( + c_longlong(0), # per process time limit (ignored) + c_longlong(0), # per job user time limit (ignored) + winprocess.JOB_OBJECT_LIMIT_BREAKAWAY_OK, + 0, # min working set (ignored) + 0, # max working set (ignored) + 0, # active process limit (ignored) + None, # affinity (ignored) + 0, # Priority class (ignored) + 0, # Scheduling class (ignored) + ) + + iocntr = IO_COUNTERS() + jeli = JOBOBJECT_EXTENDED_LIMIT_INFORMATION( + jbli, # basic limit info struct + iocntr, # io_counters (ignored) + 0, # process mem limit (ignored) + 0, # job mem limit (ignored) + 0, # peak process limit (ignored) + 0) # peak job limit (ignored) + + winprocess.SetInformationJobObject(self._job, + JobObjectExtendedLimitInformation, + addressof(jeli), + sizeof(jeli) + ) + + # Assign the job object to the process + winprocess.AssignProcessToJobObject(self._job, int(hp)) + + # It's overkill, but we use Queue to signal between threads + # because it handles errors more gracefully than event or condition. + self._process_events = Queue() + + # Spin up our thread for managing the IO Completion Port + self._procmgrthread = threading.Thread(target = self._procmgr) + except: + print >> sys.stderr, """Exception trying to use job objects; +falling back to not using job objects for managing child processes""" + tb = traceback.format_exc() + print >> sys.stderr, tb + # Ensure no dangling handles left behind + self._cleanup_job_io_port() + else: + self._job = None + + winprocess.ResumeThread(int(ht)) + if getattr(self, '_procmgrthread', None): + self._procmgrthread.start() + ht.Close() + + for i in (p2cread, c2pwrite, errwrite): + if i is not None: + i.Close() + + # Windows Process Manager - watches the IO Completion Port and + # keeps track of child processes + def _procmgr(self): + if not (self._io_port) or not (self._job): + return + + try: + self._poll_iocompletion_port() + except KeyboardInterrupt: + raise KeyboardInterrupt + + def _poll_iocompletion_port(self): + # Watch the IO Completion port for status + self._spawned_procs = {} + countdowntokill = 0 + + if MOZPROCESS_DEBUG: + print "DBG::MOZPROC Self.pid value is: %s" % self.pid + + while True: + msgid = c_ulong(0) + compkey = c_ulong(0) + pid = c_ulong(0) + portstatus = winprocess.GetQueuedCompletionStatus(self._io_port, + byref(msgid), + byref(compkey), + byref(pid), + 5000) + + # If the countdowntokill has been activated, we need to check + # if we should start killing the children or not. + if countdowntokill != 0: + diff = datetime.now() - countdowntokill + # Arbitrarily wait 3 minutes for windows to get its act together + # Windows sometimes takes a small nap between notifying the + # IO Completion port and actually killing the children, and we + # don't want to mistake that situation for the situation of an unexpected + # parent abort (which is what we're looking for here). + if diff.seconds > self.MAX_IOCOMPLETION_PORT_NOTIFICATION_DELAY: + print >> sys.stderr, "Parent process %s exited with children alive:" % self.pid + print >> sys.stderr, "PIDS: %s" % ', '.join([str(i) for i in self._spawned_procs]) + print >> sys.stderr, "Attempting to kill them..." + self.kill() + self._process_events.put({self.pid: 'FINISHED'}) + + if not portstatus: + # Check to see what happened + errcode = winprocess.GetLastError() + if errcode == winprocess.ERROR_ABANDONED_WAIT_0: + # Then something has killed the port, break the loop + print >> sys.stderr, "IO Completion Port unexpectedly closed" + break + elif errcode == winprocess.WAIT_TIMEOUT: + # Timeouts are expected, just keep on polling + continue + else: + print >> sys.stderr, "Error Code %s trying to query IO Completion Port, exiting" % errcode + raise WinError(errcode) + break + + if compkey.value == winprocess.COMPKEY_TERMINATE.value: + if MOZPROCESS_DEBUG: + print "DBG::MOZPROC compkeyterminate detected" + # Then we're done + break + + # Check the status of the IO Port and do things based on it + if compkey.value == winprocess.COMPKEY_JOBOBJECT.value: + if msgid.value == winprocess.JOB_OBJECT_MSG_ACTIVE_PROCESS_ZERO: + # No processes left, time to shut down + # Signal anyone waiting on us that it is safe to shut down + if MOZPROCESS_DEBUG: + print "DBG::MOZPROC job object msg active processes zero" + self._process_events.put({self.pid: 'FINISHED'}) + break + elif msgid.value == winprocess.JOB_OBJECT_MSG_NEW_PROCESS: + # New Process started + # Add the child proc to our list in case our parent flakes out on us + # without killing everything. + if pid.value != self.pid: + self._spawned_procs[pid.value] = 1 + if MOZPROCESS_DEBUG: + print "DBG::MOZPROC new process detected with pid value: %s" % pid.value + elif msgid.value == winprocess.JOB_OBJECT_MSG_EXIT_PROCESS: + if MOZPROCESS_DEBUG: + print "DBG::MOZPROC process id %s exited normally" % pid.value + # One process exited normally + if pid.value == self.pid and len(self._spawned_procs) > 0: + # Parent process dying, start countdown timer + countdowntokill = datetime.now() + elif pid.value in self._spawned_procs: + # Child Process died remove from list + del(self._spawned_procs[pid.value]) + elif msgid.value == winprocess.JOB_OBJECT_MSG_ABNORMAL_EXIT_PROCESS: + # One process existed abnormally + if MOZPROCESS_DEBUG: + print "DBG::MOZPROC process id %s existed abnormally" % pid.value + if pid.value == self.pid and len(self._spawned_procs) > 0: + # Parent process dying, start countdown timer + countdowntokill = datetime.now() + elif pid.value in self._spawned_procs: + # Child Process died remove from list + del self._spawned_procs[pid.value] + else: + # We don't care about anything else + if MOZPROCESS_DEBUG: + print "DBG::MOZPROC We got a message %s" % msgid.value + pass + + def _wait(self): + + # First, check to see if the process is still running + if self._handle: + self.returncode = winprocess.GetExitCodeProcess(self._handle) + else: + # Dude, the process is like totally dead! + return self.returncode + + # Python 2.5 uses isAlive versus is_alive use the proper one + threadalive = False + if hasattr(self, "_procmgrthread"): + if hasattr(self._procmgrthread, 'is_alive'): + threadalive = self._procmgrthread.is_alive() + else: + threadalive = self._procmgrthread.isAlive() + if self._job and threadalive: + # Then we are managing with IO Completion Ports + # wait on a signal so we know when we have seen the last + # process come through. + # We use queues to synchronize between the thread and this + # function because events just didn't have robust enough error + # handling on pre-2.7 versions + err = None + try: + # timeout is the max amount of time the procmgr thread will wait for + # child processes to shutdown before killing them with extreme prejudice. + item = self._process_events.get(timeout=self.MAX_IOCOMPLETION_PORT_NOTIFICATION_DELAY + + self.MAX_PROCESS_KILL_DELAY) + if item[self.pid] == 'FINISHED': + self._process_events.task_done() + except: + err = "IO Completion Port failed to signal process shutdown" + # Either way, let's try to get this code + if self._handle: + self.returncode = winprocess.GetExitCodeProcess(self._handle) + self._cleanup() + + if err is not None: + raise OSError(err) + + + else: + # Not managing with job objects, so all we can reasonably do + # is call waitforsingleobject and hope for the best + + if MOZPROCESS_DEBUG and not self._ignore_children: + print "DBG::MOZPROC NOT USING JOB OBJECTS!!!" + # First, make sure we have not already ended + if self.returncode != winprocess.STILL_ACTIVE: + self._cleanup() + return self.returncode + + rc = None + if self._handle: + rc = winprocess.WaitForSingleObject(self._handle, -1) + + if rc == winprocess.WAIT_TIMEOUT: + # The process isn't dead, so kill it + print "Timed out waiting for process to close, attempting TerminateProcess" + self.kill() + elif rc == winprocess.WAIT_OBJECT_0: + # We caught WAIT_OBJECT_0, which indicates all is well + print "Single process terminated successfully" + self.returncode = winprocess.GetExitCodeProcess(self._handle) + else: + # An error occured we should probably throw + rc = winprocess.GetLastError() + if rc: + raise WinError(rc) + + self._cleanup() + + return self.returncode + + def _cleanup_job_io_port(self): + """ Do the job and IO port cleanup separately because there are + cases where we want to clean these without killing _handle + (i.e. if we fail to create the job object in the first place) + """ + if getattr(self, '_job') and self._job != winprocess.INVALID_HANDLE_VALUE: + self._job.Close() + self._job = None + else: + # If windows already freed our handle just set it to none + # (saw this intermittently while testing) + self._job = None + + if getattr(self, '_io_port', None) and self._io_port != winprocess.INVALID_HANDLE_VALUE: + self._io_port.Close() + self._io_port = None + else: + self._io_port = None + + if getattr(self, '_procmgrthread', None): + self._procmgrthread = None + + def _cleanup(self): + self._cleanup_job_io_port() + if self._thread and self._thread != winprocess.INVALID_HANDLE_VALUE: + self._thread.Close() + self._thread = None + else: + self._thread = None + + if self._handle and self._handle != winprocess.INVALID_HANDLE_VALUE: + self._handle.Close() + self._handle = None + else: + self._handle = None + + elif isPosix: + + def _wait(self): + """ Haven't found any reason to differentiate between these platforms + so they all use the same wait callback. If it is necessary to + craft different styles of wait, then a new _wait method + could be easily implemented. + """ + + if not self._ignore_children: + try: + # os.waitpid return value: + # > [...] a tuple containing its pid and exit status + # > indication: a 16-bit number, whose low byte is the + # > signal number that killed the process, and whose + # > high byte is the exit status (if the signal number + # > is zero) + # - http://docs.python.org/2/library/os.html#os.wait + status = os.waitpid(self.pid, 0)[1] + + # For consistency, format status the same as subprocess' + # returncode attribute + if status > 255: + return status >> 8 + return -status + except OSError, e: + if getattr(e, "errno", None) != 10: + # Error 10 is "no child process", which could indicate normal + # close + print >> sys.stderr, "Encountered error waiting for pid to close: %s" % e + raise + return 0 + + else: + # For non-group wait, call base class + subprocess.Popen.wait(self) + return self.returncode + + def _cleanup(self): + pass + + else: + # An unrecognized platform, we will call the base class for everything + print >> sys.stderr, "Unrecognized platform, process groups may not be managed properly" + + def _wait(self): + self.returncode = subprocess.Popen.wait(self) + return self.returncode + + def _cleanup(self): + pass + + def __init__(self, + cmd, + args=None, + cwd=None, + env=None, + ignore_children = False, + kill_on_timeout = True, + processOutputLine=(), + onTimeout=(), + onFinish=(), + **kwargs): + self.cmd = cmd + self.args = args + self.cwd = cwd + self.didTimeout = False + self._ignore_children = ignore_children + self._kill_on_timeout = kill_on_timeout + self.keywordargs = kwargs + self.outThread = None + self.read_buffer = '' + + if env is None: + env = os.environ.copy() + self.env = env + + # handlers + self.processOutputLineHandlers = list(processOutputLine) + self.onTimeoutHandlers = list(onTimeout) + self.onFinishHandlers = list(onFinish) + + # It is common for people to pass in the entire array with the cmd and + # the args together since this is how Popen uses it. Allow for that. + if isinstance(self.cmd, list): + if self.args != None: + raise TypeError("cmd and args must not both be lists") + (self.cmd, self.args) = (self.cmd[0], self.cmd[1:]) + elif self.args is None: + self.args = [] + + @property + def timedOut(self): + """True if the process has timed out.""" + return self.didTimeout + + @property + def commandline(self): + """the string value of the command line (command + args)""" + return subprocess.list2cmdline([self.cmd] + self.args) + + def run(self, timeout=None, outputTimeout=None): + """ + Starts the process. + + If timeout is not None, the process will be allowed to continue for + that number of seconds before being killed. If the process is killed + due to a timeout, the onTimeout handler will be called. + + If outputTimeout is not None, the process will be allowed to continue + for that number of seconds without producing any output before + being killed. + """ + self.didTimeout = False + self.startTime = datetime.now() + + # default arguments + args = dict(stdout=subprocess.PIPE, + stderr=subprocess.STDOUT, + cwd=self.cwd, + env=self.env, + ignore_children=self._ignore_children) + + # build process arguments + args.update(self.keywordargs) + + # launch the process + self.proc = self.Process([self.cmd] + self.args, **args) + + self.processOutput(timeout=timeout, outputTimeout=outputTimeout) + + def kill(self, sig=None): + """ + Kills the managed process. + + If you created the process with 'ignore_children=False' (the + default) then it will also also kill all child processes spawned by + it. If you specified 'ignore_children=True' when creating the + process, only the root process will be killed. + + Note that this does not manage any state, save any output etc, + it immediately kills the process. + + :param sig: Signal used to kill the process, defaults to SIGKILL + (has no effect on Windows) + """ + try: + return self.proc.kill(sig=sig) + except AttributeError: + # Try to print a relevant error message. + if not self.proc: + print >> sys.stderr, "Unable to kill Process because call to ProcessHandler constructor failed." + else: + raise + + def readWithTimeout(self, f, timeout): + """ + Try to read a line of output from the file object *f*. + + *f* must be a pipe, like the *stdout* member of a subprocess.Popen + object created with stdout=PIPE. If no output + is received within *timeout* seconds, return a blank line. + + Returns a tuple (line, did_timeout), where *did_timeout* is True + if the read timed out, and False otherwise. + """ + # Calls a private member because this is a different function based on + # the OS + return self._readWithTimeout(f, timeout) + + def processOutputLine(self, line): + """Called for each line of output that a process sends to stdout/stderr.""" + for handler in self.processOutputLineHandlers: + handler(line) + + def onTimeout(self): + """Called when a process times out.""" + for handler in self.onTimeoutHandlers: + handler() + + def onFinish(self): + """Called when a process finishes without a timeout.""" + for handler in self.onFinishHandlers: + handler() + + def processOutput(self, timeout=None, outputTimeout=None): + """ + Handle process output until the process terminates or times out. + + If timeout is not None, the process will be allowed to continue for + that number of seconds before being killed. + + If outputTimeout is not None, the process will be allowed to continue + for that number of seconds without producing any output before + being killed. + """ + def _processOutput(): + self.didTimeout = False + logsource = self.proc.stdout + + lineReadTimeout = None + if timeout: + lineReadTimeout = timeout - (datetime.now() - self.startTime).seconds + elif outputTimeout: + lineReadTimeout = outputTimeout + + (lines, self.didTimeout) = self.readWithTimeout(logsource, lineReadTimeout) + while lines != "": + for line in lines.splitlines(): + self.processOutputLine(line.rstrip()) + + if self.didTimeout: + break + + if timeout: + lineReadTimeout = timeout - (datetime.now() - self.startTime).seconds + (lines, self.didTimeout) = self.readWithTimeout(logsource, lineReadTimeout) + + if self.didTimeout: + if self._kill_on_timeout: + self.proc.kill() + self.onTimeout() + else: + self.onFinish() + + if not hasattr(self, 'proc'): + self.run() + + if not self.outThread: + self.outThread = threading.Thread(target=_processOutput) + self.outThread.daemon = True + self.outThread.start() + + + def wait(self, timeout=None): + """ + Waits until all output has been read and the process is + terminated. + + If timeout is not None, will return after timeout seconds. + This timeout only causes the wait function to return and + does not kill the process. + + Returns the process' exit code. A None value indicates the + process hasn't terminated yet. A negative value -N indicates + the process was killed by signal N (Unix only). + """ + if self.outThread: + # Thread.join() blocks the main thread until outThread is finished + # wake up once a second in case a keyboard interrupt is sent + count = 0 + while self.outThread.isAlive(): + self.outThread.join(timeout=1) + count += 1 + if timeout and count > timeout: + return None + + return self.proc.wait() + + # TODO Remove this method when consumers have been fixed + def waitForFinish(self, timeout=None): + print >> sys.stderr, "MOZPROCESS WARNING: ProcessHandler.waitForFinish() is deprecated, " \ + "use ProcessHandler.wait() instead" + return self.wait(timeout=timeout) + + + ### Private methods from here on down. Thar be dragons. + + if isWin: + # Windows Specific private functions are defined in this block + PeekNamedPipe = ctypes.windll.kernel32.PeekNamedPipe + GetLastError = ctypes.windll.kernel32.GetLastError + + def _readWithTimeout(self, f, timeout): + if timeout is None: + # shortcut to allow callers to pass in "None" for no timeout. + return (f.readline(), False) + x = msvcrt.get_osfhandle(f.fileno()) + l = ctypes.c_long() + done = time.time() + timeout + while time.time() < done: + if self.PeekNamedPipe(x, None, 0, None, ctypes.byref(l), None) == 0: + err = self.GetLastError() + if err == 38 or err == 109: # ERROR_HANDLE_EOF || ERROR_BROKEN_PIPE + return ('', False) + else: + raise OSError("readWithTimeout got error: %d", err) + if l.value > 0: + # we're assuming that the output is line-buffered, + # which is not unreasonable + return (f.readline(), False) + time.sleep(0.01) + return ('', True) + + else: + # Generic + def _readWithTimeout(self, f, timeout): + while True: + try: + (r, w, e) = select.select([f], [], [], timeout) + except: + # return a blank line + return ('', True) + + if len(r) == 0: + return ('', True) + + output = os.read(f.fileno(), 4096) + if not output: + output = self.read_buffer + self.read_buffer = '' + return (output, False) + self.read_buffer += output + if '\n' not in self.read_buffer: + time.sleep(0.01) + continue + tmp = self.read_buffer.split('\n') + lines, self.read_buffer = tmp[:-1], tmp[-1] + real_lines = [x for x in lines if x != ''] + if not real_lines: + time.sleep(0.01) + continue + break + return ('\n'.join(lines), False) + + @property + def pid(self): + return self.proc.pid + + +### default output handlers +### these should be callables that take the output line + +def print_output(line): + print line + +class StoreOutput(object): + """accumulate stdout""" + + def __init__(self): + self.output = [] + + def __call__(self, line): + self.output.append(line) + +class LogOutput(object): + """pass output to a file""" + + def __init__(self, filename): + self.filename = filename + self.file = None + + def __call__(self, line): + if self.file is None: + self.file = file(self.filename, 'a') + self.file.write(line + '\n') + self.file.flush() + + def __del__(self): + if self.file is not None: + self.file.close() + +### front end class with the default handlers + +class ProcessHandler(ProcessHandlerMixin): + """ + Convenience class for handling processes with default output handlers. + + If no processOutputLine keyword argument is specified, write all + output to stdout. Otherwise, the function specified by this argument + will be called for each line of output; the output will not be written + to stdout automatically. + + If storeOutput==True, the output produced by the process will be saved + as self.output. + + If logfile is not None, the output produced by the process will be + appended to the given file. + """ + + def __init__(self, cmd, logfile=None, storeOutput=True, **kwargs): + kwargs.setdefault('processOutputLine', []) + + # Print to standard output only if no outputline provided + if not kwargs['processOutputLine']: + kwargs['processOutputLine'].append(print_output) + + if logfile: + logoutput = LogOutput(logfile) + kwargs['processOutputLine'].append(logoutput) + + self.output = None + if storeOutput: + storeoutput = StoreOutput() + self.output = storeoutput.output + kwargs['processOutputLine'].append(storeoutput) + + ProcessHandlerMixin.__init__(self, cmd, **kwargs) |