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# 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
import pprint
import signal
import subprocess
import sys
import time
import traceback
from threading import Event
import mozcrash
import psutil
import six
from mozlog import get_proxy_logger
from mozprocess import ProcessHandler
from talos.utils import TalosError
LOG = get_proxy_logger()
class ProcessContext(object):
Store useful results of the browser execution.
def __init__(self, is_launcher=False):
self.output = None
self.process = None
self.is_launcher = is_launcher
def pid(self):
return self.process and
def kill_process(self):
Kill the process, returning the exit code or None if the process
is already finished.
parentProc = self.process
# If we're using a launcher process, terminate that instead of us:
kids = parentProc and parentProc.is_running() and parentProc.children()
if self.is_launcher and kids and len(kids) == 1 and kids[0].is_running():
"Launcher process {} detected. Terminating parent"
" process {} instead."
).format(parentProc, kids[0])
parentProc = kids[0]
if parentProc and parentProc.is_running():
LOG.debug("Terminating %s" % parentProc)
except psutil.NoSuchProcess:
procs = parentProc.children()
for p in procs:
c = ProcessContext()
c.process = p
return parentProc.returncode
return parentProc.wait(3)
except psutil.TimeoutExpired:
LOG.debug("Killing %s" % parentProc)
# will raise TimeoutExpired if unable to kill
return parentProc.wait(3)
class Reader(object):
def __init__(self, event):
self.output = []
self.got_end_timestamp = False
self.got_timeout = False
self.timeout_message = ""
self.got_error = False
self.event = event
self.proc = None
def __call__(self, line):
line = six.ensure_str(line)
if line.find("__endTimestamp") != -1:
self.got_end_timestamp = True
elif line == "TART: TIMEOUT":
self.got_timeout = True
self.timeout_message = "TART"
elif line.startswith("TEST-UNEXPECTED-FAIL | "):
self.got_error = True
if not (
"JavaScript error:" in line
or "JavaScript warning:" in line
or "SyntaxError:" in line
or "TypeError:" in line
LOG.process_output(, line)
def run_browser(
Run the browser using the given `command`.
After the browser prints __endTimestamp, we give it 5
seconds to quit and kill it if it's still alive at that point.
Note that this method ensure that the process is killed at
the end. If this is not possible, an exception will be raised.
:param command: the commad (as a string list) to run the browser
:param minidump_dir: a path where to extract minidumps in case the
browser hang. This have to be the same value
used in `mozcrash.check_for_crashes`.
:param timeout: if specified, timeout to wait for the browser before
we raise a :class:`TalosError`
:param on_started: a callback that can be used to do things just after
the browser has been started. The callback must takes
an argument, which is the psutil.Process instance
:param kwargs: additional keyword arguments for the :class:`ProcessHandler`
Returns a ProcessContext instance, with available output and pid used.
debugger_info = find_debugger_info(debug, debugger, debugger_args)
if debugger_info is not None:
return run_in_debug_mode(
command, debugger_info, on_started=on_started, env=kwargs.get("env")
is_launcher = sys.platform.startswith("win") and "-wait-for-browser" in command
context = ProcessContext(is_launcher)
first_time = int(time.time()) * 1000
wait_for_quit_timeout = 20
event = Event()
reader = Reader(event)"Using env: %s" % pprint.pformat(kwargs["env"]))
kwargs["storeOutput"] = False
kwargs["processOutputLine"] = reader
kwargs["onFinish"] = event.set
proc = ProcessHandler(command, **kwargs)
reader.proc = proc
LOG.process_start(, " ".join(command))
context.process = psutil.Process(
if on_started:
# wait until we saw __endTimestamp in the proc output,
# or the browser just terminated - or we have a timeout
if not event.wait(timeout):"Timeout waiting for test completion; killing browser...")
# try to extract the minidump stack if the browser hangs
kill_and_get_minidump(context, minidump_dir)
raise TalosError("timeout")
if reader.got_end_timestamp:
for i in six.moves.range(1, wait_for_quit_timeout):
if proc.wait(1) is not None:
if proc.poll() is None:
"Browser shutdown timed out after {0} seconds, killing"
" process.".format(wait_for_quit_timeout)
kill_and_get_minidump(context, minidump_dir)
raise TalosError(
"Browser shutdown timed out after {0} seconds, killed"
" process.".format(wait_for_quit_timeout)
elif reader.got_timeout:
raise TalosError("TIMEOUT: %s" % reader.timeout_message)
elif reader.got_error:
raise TalosError("unexpected error")
# this also handle KeyboardInterrupt
# ensure early the process is really terminated
return_code = None
return_code = context.kill_process()
if return_code is None:
return_code = proc.wait(1)
except Exception:
# Maybe killed by kill_and_get_minidump(), maybe ended?"Unable to kill process")
"__startBeforeLaunchTimestamp%d__endBeforeLaunchTimestamp" % first_time
% (int(time.time()) * 1000)
if return_code is not None:
LOG.process_exit(, return_code)
LOG.debug("Unable to detect exit code of the process %s." %
context.output = reader.output
return context
def find_debugger_info(debug, debugger, debugger_args):
debuggerInfo = None
if debug or debugger or debugger_args:
import mozdebug
if not debugger:
# No debugger name was provided. Look for the default ones on
# current OS.
debugger = mozdebug.get_default_debugger_name(
debuggerInfo = None
if debugger:
debuggerInfo = mozdebug.get_debugger_info(debugger, debugger_args)
if debuggerInfo is None:
raise TalosError("Could not find a suitable debugger in your PATH.")
return debuggerInfo
def run_in_debug_mode(command, debugger_info, on_started=None, env=None):
signal.signal(signal.SIGINT, lambda sigid, frame: None)
context = ProcessContext()
command_under_dbg = [debugger_info.path] + debugger_info.args + command
ttest_process = subprocess.Popen(command_under_dbg, env=env)
context.process = psutil.Process(
if on_started:
return_code = ttest_process.wait()
if return_code is not None:
LOG.process_exit(, return_code)
LOG.debug("Unable to detect exit code of the process %s." %
return context
def kill_and_get_minidump(context, minidump_dir):
proc = context.process
if context.is_launcher:
kids = context.process.children()
if len(kids) == 1:
"Launcher process {} detected. Killing parent"
" process {} instead."
).format(proc, kids[0])
proc = kids[0]
LOG.debug("Killing %s and writing a minidump file" % proc)
mozcrash.kill_and_get_minidump(, minidump_dir)