root / lib / jqueue.py @ 2467e0d3
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# Copyright (C) 2006, 2007 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Module implementing the job queue handling."""
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import logging |
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import threading |
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from ganeti import constants |
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from ganeti import workerpool |
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from ganeti import errors |
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from ganeti import mcpu |
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JOBQUEUE_THREADS = 5
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class _QueuedOpCode(object): |
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"""Encasulates an opcode object.
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Access must be synchronized by using an external lock.
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"""
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def __init__(self, op): |
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self.input = op
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self.status = constants.OP_STATUS_QUEUED
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self.result = None |
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class _QueuedJob(object): |
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"""In-memory job representation.
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This is what we use to track the user-submitted jobs.
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"""
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def __init__(self, ops, job_id): |
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if not ops: |
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# TODO
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raise Exception("No opcodes") |
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self.id = job_id
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self._lock = threading.Lock()
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# _ops should not be modified again because we don't acquire the lock
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# to use it.
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self._ops = [_QueuedOpCode(op) for op in ops] |
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def _GetStatusUnlocked(self): |
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status = constants.JOB_STATUS_QUEUED |
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all_success = True
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for op in self._ops: |
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if op.status == constants.OP_STATUS_SUCCESS:
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continue
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all_success = False
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if op.status == constants.OP_STATUS_QUEUED:
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pass
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elif op.status == constants.OP_STATUS_ERROR:
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status = constants.JOB_STATUS_ERROR |
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elif op.status == constants.OP_STATUS_RUNNING:
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status = constants.JOB_STATUS_RUNNING |
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if all_success:
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status = constants.JOB_STATUS_SUCCESS |
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return status
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def GetStatus(self): |
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self._lock.acquire()
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try:
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return self._GetStatusUnlocked() |
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finally:
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self._lock.release()
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def Run(self, proc): |
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"""Job executor.
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This functions processes a this job in the context of given processor
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instance.
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Args:
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- proc: Ganeti Processor to run the job with
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"""
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try:
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for op in self._ops: |
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try:
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self._lock.acquire()
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try:
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op.status = constants.OP_STATUS_RUNNING |
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finally:
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self._lock.release()
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result = proc.ExecOpCode(op.input) |
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self._lock.acquire()
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try:
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op.status = constants.OP_STATUS_SUCCESS |
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op.result = result |
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finally:
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self._lock.release()
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except Exception, err: |
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self._lock.acquire()
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try:
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op.status = constants.OP_STATUS_ERROR |
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op.result = str(err)
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finally:
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self._lock.release()
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raise
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except errors.GenericError, err:
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logging.error("ganeti exception %s", exc_info=err)
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except Exception, err: |
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logging.error("unhandled exception %s", exc_info=err)
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except:
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logging.error("unhandled unknown exception %s", exc_info=err)
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class _JobQueueWorker(workerpool.BaseWorker): |
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def RunTask(self, job): |
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logging.debug("Worker %s processing job %s",
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self.worker_id, job.id)
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# TODO: feedback function
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proc = mcpu.Processor(self.pool.context, feedback=lambda x: None) |
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try:
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job.Run(proc) |
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finally:
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logging.debug("Worker %s finished job %s, status = %s",
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self.worker_id, job.id, job.GetStatus())
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class _JobQueueWorkerPool(workerpool.WorkerPool): |
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def __init__(self, context): |
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super(_JobQueueWorkerPool, self).__init__(JOBQUEUE_THREADS, |
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_JobQueueWorker) |
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self.context = context
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class JobQueue: |
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"""The job queue.
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"""
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def __init__(self, context): |
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self._lock = threading.Lock()
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self._last_job_id = 0 |
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self._jobs = {}
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self._wpool = _JobQueueWorkerPool(context)
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def _NewJobIdUnlocked(self): |
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"""Generates a new job identifier.
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Returns: A string representing the job identifier.
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"""
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self._last_job_id += 1 |
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return str(self._last_job_id) |
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def SubmitJob(self, ops): |
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"""Add a new job to the queue.
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This enters the job into our job queue and also puts it on the new
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queue, in order for it to be picked up by the queue processors.
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Args:
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- ops: Sequence of opcodes
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"""
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# Get job identifier
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self._lock.acquire()
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try:
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job_id = self._NewJobIdUnlocked()
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finally:
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self._lock.release()
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job = _QueuedJob(ops, job_id) |
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# Add it to our internal queue
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self._lock.acquire()
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try:
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self._jobs[job_id] = job
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finally:
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self._lock.release()
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# Add to worker pool
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self._wpool.AddTask(job)
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return job_id
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def ArchiveJob(self, job_id): |
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raise NotImplementedError() |
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def CancelJob(self, job_id): |
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raise NotImplementedError() |
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def _GetJobInfo(self, job, fields): |
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row = [] |
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for fname in fields: |
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if fname == "id": |
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row.append(job.id) |
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elif fname == "status": |
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row.append(job.GetStatus()) |
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elif fname == "result": |
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# TODO
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row.append(map(lambda op: op.result, job._ops)) |
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else:
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raise errors.OpExecError("Invalid job query field '%s'" % fname) |
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return row
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def QueryJobs(self, job_ids, fields): |
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"""Returns a list of jobs in queue.
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Args:
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- job_ids: Sequence of job identifiers or None for all
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- fields: Names of fields to return
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"""
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self._lock.acquire()
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try:
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if not job_ids: |
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job_ids = self._jobs.keys()
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# TODO: define sort order?
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job_ids.sort() |
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jobs = [] |
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for job_id in job_ids: |
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job = self._jobs.get(job_id, None) |
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if job is None: |
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jobs.append(None)
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else:
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jobs.append(self._GetJobInfo(job, fields))
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return jobs
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finally:
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self._lock.release()
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def Shutdown(self): |
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"""Stops the job queue.
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"""
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self._wpool.TerminateWorkers()
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