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@ -8,7 +8,7 @@ try:
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import queue
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except ImportError:
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import Queue as queue
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from datetime import datetime
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from datetime import datetime, timedelta
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from collections import namedtuple
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from cps import calibre_db
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@ -23,9 +23,9 @@ STAT_STARTED = 2
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STAT_FINISH_SUCCESS = 3
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# Only retain this many tasks in dequeued list
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TASK_CLEANUP_TRIGGER = 20
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TASK_CLEANUP_TRIGGER = 5
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QueuedTask = namedtuple('QueuedTask', 'user, added, task')
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QueuedTask = namedtuple('QueuedTask', 'num, user, added, task')
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def _get_main_thread():
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@ -62,13 +62,15 @@ class WorkerThread(threading.Thread):
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self.doLock = threading.Lock()
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self.queue = ImprovedQueue()
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self.num = 0
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self.start()
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@classmethod
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def add(cls, user, task):
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ins = cls.getInstance()
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ins.num += 1
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ins.queue.put(QueuedTask(
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num=ins.num,
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user=user,
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added=datetime.now(),
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task=task,
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@ -77,8 +79,9 @@ class WorkerThread(threading.Thread):
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@property
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def tasks(self):
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with self.doLock:
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tasks = list(self.queue.to_list()) + self.dequeued
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return sorted(tasks, key=lambda x: x.added)
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tasks = self.queue.to_list() + self.dequeued
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return sorted(tasks, key=lambda x: x.num)
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# Main thread loop starting the different tasks
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def run(self):
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@ -86,23 +89,34 @@ class WorkerThread(threading.Thread):
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while main_thread.is_alive():
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item = self.queue.get()
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# add to list so that in-progress tasks show up
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with self.doLock:
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# Remove completed tasks if needed
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# once we hit our trigger, start cleaning up dead tasks
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if len(self.dequeued) > TASK_CLEANUP_TRIGGER:
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# sort first (just to be certain), then lob off the extra
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self.dequeued = sorted(self.dequeued, key=lambda x: x.added)[-1 * TASK_CLEANUP_TRIGGER:]
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dead = []
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alive = []
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for x in self.dequeued:
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(dead if x.task.dead else alive).append(x)
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# if the ones that we need to keep are within the trigger, do nothing else
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delta = len(self.dequeued) - len(dead)
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if delta > TASK_CLEANUP_TRIGGER:
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ret = alive
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else:
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# otherwise, lop off the oldest dead tasks until we hit the target trigger
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ret = sorted(dead, key=lambda x: x.task.end_time)[-TASK_CLEANUP_TRIGGER:] + alive
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self.dequeued = sorted(ret, key=lambda x: x.num)
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# add to list so that in-progress tasks show up
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self.dequeued.append(item)
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user, added, task = item
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# sometimes tasks (like Upload) don't actually have work to do and are created as already finished
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if task.stat is STAT_WAITING:
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if item.task.stat is STAT_WAITING:
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# CalibreTask.start() should wrap all exceptions in it's own error handling
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task.start(self)
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item.task.start(self)
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self.queue.task_done()
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class CalibreTask:
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__metaclass__ = abc.ABCMeta
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@ -168,6 +182,15 @@ class CalibreTask:
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def runtime(self):
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return (self.end_time or datetime.now()) - self.start_time
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@property
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def dead(self):
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"""Determines whether or not this task can be garbage collected
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We have a separate dictating this because there may be certain tasks that want to override this
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"""
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# By default, we're good to clean a task if it's "Done"
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return self.stat in (STAT_FINISH_SUCCESS, STAT_FAIL)
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@progress.setter
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def progress(self, x):
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# todo: throw error if outside of [0,1]
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