Warning
This document is for an old release of Galaxy. You can alternatively view this page in the latest release if it exists or view the top of the latest release's documentation.
Source code for galaxy.jobs.runners.local
"""
Job runner plugin for executing jobs on the local system via the command line.
"""
import datetime
import errno
import logging
import os
import subprocess
import tempfile
import threading
from time import sleep
from galaxy import model
from galaxy.util import (
asbool,
DATABASE_MAX_STRING_SIZE,
shrink_stream_by_size
)
from ..runners import (
BaseJobRunner,
JobState
)
log = logging.getLogger(__name__)
__all__ = ('LocalJobRunner', )
DEFAULT_POOL_SLEEP_TIME = 1
# TODO: Set to false and just get rid of this option. It would simplify this
# class nicely. -John
DEFAULT_EMBED_METADATA_IN_JOB = True
[docs]class LocalJobRunner(BaseJobRunner):
"""
Job runner backed by a finite pool of worker threads. FIFO scheduling
"""
runner_name = "LocalRunner"
[docs] def __init__(self, app, nworkers):
"""Start the job runner """
# create a local copy of os.environ to use as env for subprocess.Popen
self._environ = os.environ.copy()
self._proc_lock = threading.Lock()
self._procs = []
# Set TEMP if a valid temp value is not already set
if not ('TMPDIR' in self._environ or 'TEMP' in self._environ or 'TMP' in self._environ):
self._environ['TEMP'] = os.path.abspath(tempfile.gettempdir())
super(LocalJobRunner, self).__init__(app, nworkers)
self._init_worker_threads()
def __command_line(self, job_wrapper):
"""
"""
command_line = job_wrapper.runner_command_line
# slots would be cleaner name, but don't want deployers to see examples and think it
# is going to work with other job runners.
slots = job_wrapper.job_destination.params.get("local_slots", None) or os.environ.get("GALAXY_SLOTS", None)
if slots:
slots_statement = 'GALAXY_SLOTS="%d"; export GALAXY_SLOTS; GALAXY_SLOTS_CONFIGURED="1"; export GALAXY_SLOTS_CONFIGURED;' % (int(slots))
else:
slots_statement = 'GALAXY_SLOTS="1"; export GALAXY_SLOTS;'
job_id = job_wrapper.get_id_tag()
job_file = JobState.default_job_file(job_wrapper.working_directory, job_id)
exit_code_path = JobState.default_exit_code_file(job_wrapper.working_directory, job_id)
job_script_props = {
'slots_statement': slots_statement,
'command': command_line,
'exit_code_path': exit_code_path,
'working_directory': job_wrapper.working_directory,
}
job_file_contents = self.get_job_file(job_wrapper, **job_script_props)
self.write_executable_script(job_file, job_file_contents)
return job_file, exit_code_path
[docs] def queue_job(self, job_wrapper):
if not self._prepare_job_local(job_wrapper):
return
stderr = stdout = ''
exit_code = 0
# command line has been added to the wrapper by prepare_job()
command_line, exit_code_path = self.__command_line(job_wrapper)
job_id = job_wrapper.get_id_tag()
try:
stdout_file = tempfile.NamedTemporaryFile(suffix='_stdout', dir=job_wrapper.working_directory)
stderr_file = tempfile.NamedTemporaryFile(suffix='_stderr', dir=job_wrapper.working_directory)
log.debug('(%s) executing job script: %s' % (job_id, command_line))
proc = subprocess.Popen(args=command_line,
shell=True,
cwd=job_wrapper.working_directory,
stdout=stdout_file,
stderr=stderr_file,
env=self._environ,
preexec_fn=os.setpgrp)
proc.terminated_by_shutdown = False
with self._proc_lock:
self._procs.append(proc)
try:
job_wrapper.set_job_destination(job_wrapper.job_destination, proc.pid)
job_wrapper.change_state(model.Job.states.RUNNING)
terminated = self.__poll_if_needed(proc, job_wrapper, job_id)
if terminated:
return
# Reap the process and get the exit code.
exit_code = proc.wait()
finally:
with self._proc_lock:
self._procs.remove(proc)
try:
exit_code = int(open(exit_code_path, 'r').read())
except Exception:
log.warning("Failed to read exit code from path %s" % exit_code_path)
pass
if proc.terminated_by_shutdown:
self._fail_job_local(job_wrapper, "job terminated by Galaxy shutdown")
return
stdout_file.seek(0)
stderr_file.seek(0)
stdout = shrink_stream_by_size(stdout_file, DATABASE_MAX_STRING_SIZE, join_by="\n..\n", left_larger=True, beginning_on_size_error=True)
stderr = shrink_stream_by_size(stderr_file, DATABASE_MAX_STRING_SIZE, join_by="\n..\n", left_larger=True, beginning_on_size_error=True)
stdout_file.close()
stderr_file.close()
log.debug('execution finished: %s' % command_line)
except Exception:
log.exception("failure running job %d", job_wrapper.job_id)
self._fail_job_local(job_wrapper, "failure running job")
return
self._handle_metadata_if_needed(job_wrapper)
job_destination = job_wrapper.job_destination
job_state = JobState(job_wrapper, job_destination)
job_state.stop_job = False
# Finish the job!
try:
self._finish_or_resubmit_job(job_state, stdout, stderr, exit_code)
except Exception:
log.exception("Job wrapper finish method failed")
self._fail_job_local(job_wrapper, "Unable to finish job")
[docs] def stop_job(self, job):
# if our local job has JobExternalOutputMetadata associated, then our primary job has to have already finished
job_ext_output_metadata = job.get_external_output_metadata()
try:
pid = job_ext_output_metadata[0].job_runner_external_pid # every JobExternalOutputMetadata has a pid set, we just need to take from one of them
assert pid not in [None, '']
except Exception:
# metadata internal or job not complete yet
pid = job.get_job_runner_external_id()
if pid in [None, '']:
log.warning("stop_job(): %s: no PID in database for job, unable to stop" % job.get_id())
return
pid = int(pid)
if not self._check_pid(pid):
log.warning("stop_job(): %s: PID %d was already dead or can't be signaled" % (job.get_id(), pid))
return
for sig in [15, 9]:
try:
os.killpg(pid, sig)
except OSError as e:
log.warning("stop_job(): %s: Got errno %s when attempting to signal %d to PID %d: %s" % (job.get_id(), errno.errorcode[e.errno], sig, pid, e.strerror))
return # give up
sleep(2)
if not self._check_pid(pid):
log.debug("stop_job(): %s: PID %d successfully killed with signal %d" % (job.get_id(), pid, sig))
return
else:
log.warning("stop_job(): %s: PID %d refuses to die after signaling TERM/KILL" % (job.get_id(), pid))
[docs] def recover(self, job, job_wrapper):
# local jobs can't be recovered
job_wrapper.change_state(model.Job.states.ERROR, info="This job was killed when Galaxy was restarted. Please retry the job.")
[docs] def shutdown(self):
super(LocalJobRunner, self).shutdown()
with self._proc_lock:
for proc in self._procs:
proc.terminated_by_shutdown = True
self._terminate(proc)
def _fail_job_local(self, job_wrapper, message):
job_destination = job_wrapper.job_destination
job_state = JobState(job_wrapper, job_destination)
job_state.fail_message = message
job_state.stop_job = False
self.fail_job(job_state, exception=True)
def _handle_metadata_if_needed(self, job_wrapper):
if not self._embed_metadata(job_wrapper):
self._handle_metadata_externally(job_wrapper, resolve_requirements=True)
def _embed_metadata(self, job_wrapper):
job_destination = job_wrapper.job_destination
embed_metadata = asbool(job_destination.params.get("embed_metadata_in_job", DEFAULT_EMBED_METADATA_IN_JOB))
return embed_metadata
def _prepare_job_local(self, job_wrapper):
return self.prepare_job(job_wrapper, include_metadata=self._embed_metadata(job_wrapper))
def _check_pid(self, pid):
try:
os.kill(pid, 0)
return True
except OSError as e:
if e.errno == errno.ESRCH:
log.debug("_check_pid(): PID %d is dead" % pid)
else:
log.warning("_check_pid(): Got errno %s when attempting to check PID %d: %s" % (errno.errorcode[e.errno], pid, e.strerror))
return False
def _terminate(self, proc):
os.killpg(proc.pid, 15)
sleep(1)
if proc.poll() is None:
os.killpg(proc.pid, 9)
return proc.wait() # reap
def __poll_if_needed(self, proc, job_wrapper, job_id):
# Only poll if needed (i.e. job limits are set)
if not job_wrapper.has_limits():
return
job_start = datetime.datetime.now()
i = 0
# Iterate until the process exits, periodically checking its limits
while proc.poll() is None:
i += 1
if (i % 20) == 0:
limit_state = job_wrapper.check_limits(runtime=datetime.datetime.now() - job_start)
if limit_state is not None:
job_wrapper.fail(limit_state[1])
log.debug('(%s) Terminating process group' % job_id)
self._terminate(proc)
return True
else:
sleep(DEFAULT_POOL_SLEEP_TIME)