240 lines
8.3 KiB
Python
240 lines
8.3 KiB
Python
import time
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import gevent
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import gevent.lock
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from Debug import Debug
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from Config import config
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from Content.ContentManager import VerifyError
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class WorkerDownloadError(Exception):
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pass
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class WorkerIOError(Exception):
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pass
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class WorkerStop(Exception):
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pass
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class Worker(object):
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def __init__(self, manager, peer):
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self.manager = manager
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self.peer = peer
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self.task = None
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self.key = None
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self.running = False
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self.thread = None
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self.num_downloaded = 0
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self.num_failed = 0
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def __str__(self):
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return "Worker %s %s" % (self.manager.site.address_short, self.key)
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def __repr__(self):
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return "<%s>" % self.__str__()
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def waitForTask(self, task, timeout): # Wait for other workers to finish the task
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for sleep_i in range(1, timeout * 10):
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time.sleep(0.1)
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if task["done"] or task["workers_num"] == 0:
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if config.verbose:
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self.manager.log.debug("%s: %s, picked task free after %ss sleep. (done: %s)" % (
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self.key, task["inner_path"], 0.1 * sleep_i, task["done"]
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))
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break
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if sleep_i % 10 == 0:
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workers = self.manager.findWorkers(task)
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if not workers or not workers[0].peer.connection:
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break
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worker_idle = time.time() - workers[0].peer.connection.last_recv_time
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if worker_idle > 1:
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if config.verbose:
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self.manager.log.debug("%s: %s, worker %s seems idle, picked up task after %ss sleep. (done: %s)" % (
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self.key, task["inner_path"], workers[0].key, 0.1 * sleep_i, task["done"]
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))
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break
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return True
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def pickTask(self): # Find and select a new task for the worker
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task = self.manager.getTask(self.peer)
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if not task: # No more task
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time.sleep(0.1) # Wait a bit for new tasks
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task = self.manager.getTask(self.peer)
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if not task: # Still no task, stop it
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stats = "downloaded files: %s, failed: %s" % (self.num_downloaded, self.num_failed)
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self.manager.log.debug("%s: No task found, stopping (%s)" % (self.key, stats))
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return False
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if not task["time_started"]:
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task["time_started"] = time.time() # Task started now
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if task["workers_num"] > 0: # Wait a bit if someone already working on it
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if task["peers"]: # It's an update
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timeout = 3
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else:
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timeout = 1
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if task["size"] > 100 * 1024 * 1024:
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timeout = timeout * 2
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if config.verbose:
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self.manager.log.debug("%s: Someone already working on %s (pri: %s), sleeping %s sec..." % (
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self.key, task["inner_path"], task["priority"], timeout
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))
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self.waitForTask(task, timeout)
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return task
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def downloadTask(self, task):
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try:
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buff = self.peer.getFile(task["site"].address, task["inner_path"], task["size"])
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except Exception as err:
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self.manager.log.debug("%s: getFile error: %s" % (self.key, err))
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raise WorkerDownloadError(str(err))
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if not buff:
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raise WorkerDownloadError("No response")
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return buff
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def getTaskLock(self, task):
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if task["lock"] is None:
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task["lock"] = gevent.lock.Semaphore()
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return task["lock"]
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def writeTask(self, task, buff):
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buff.seek(0)
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try:
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task["site"].storage.write(task["inner_path"], buff)
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except Exception as err:
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if type(err) == Debug.Notify:
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self.manager.log.debug("%s: Write aborted: %s (%s: %s)" % (self.key, task["inner_path"], type(err), err))
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else:
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self.manager.log.error("%s: Error writing: %s (%s: %s)" % (self.key, task["inner_path"], type(err), err))
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raise WorkerIOError(str(err))
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def onTaskVerifyFail(self, task, error_message):
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self.num_failed += 1
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if self.manager.started_task_num < 50 or config.verbose:
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self.manager.log.debug(
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"%s: Verify failed: %s, error: %s, failed peers: %s, workers: %s" %
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(self.key, task["inner_path"], error_message, len(task["failed"]), task["workers_num"])
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)
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task["failed"].append(self.peer)
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self.peer.hash_failed += 1
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if self.peer.hash_failed >= max(len(self.manager.tasks), 3) or self.peer.connection_error > 10:
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# Broken peer: More fails than tasks number but atleast 3
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raise WorkerStop(
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"Too many errors (hash failed: %s, connection error: %s)" %
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(self.peer.hash_failed, self.peer.connection_error)
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)
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def handleTask(self, task):
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download_err = write_err = False
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write_lock = None
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try:
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buff = self.downloadTask(task)
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if task["done"] is True: # Task done, try to find new one
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return None
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if self.running is False: # Worker no longer needed or got killed
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self.manager.log.debug("%s: No longer needed, returning: %s" % (self.key, task["inner_path"]))
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raise WorkerStop("Running got disabled")
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write_lock = self.getTaskLock(task)
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write_lock.acquire()
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if task["site"].content_manager.verifyFile(task["inner_path"], buff) is None:
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is_same = True
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else:
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is_same = False
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is_valid = True
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except (WorkerDownloadError, VerifyError) as err:
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download_err = err
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is_valid = False
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is_same = False
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if is_valid and not is_same:
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if self.manager.started_task_num < 50 or task["priority"] > 10 or config.verbose:
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self.manager.log.debug("%s: Verify correct: %s" % (self.key, task["inner_path"]))
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try:
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self.writeTask(task, buff)
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except WorkerIOError as err:
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write_err = err
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if not task["done"]:
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if write_err:
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self.manager.failTask(task, reason="Write error")
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self.num_failed += 1
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self.manager.log.error("%s: Error writing %s: %s" % (self.key, task["inner_path"], write_err))
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elif is_valid:
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self.manager.doneTask(task)
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self.num_downloaded += 1
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if write_lock is not None and write_lock.locked():
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write_lock.release()
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if not is_valid:
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self.onTaskVerifyFail(task, download_err)
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time.sleep(1)
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return False
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return True
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def downloader(self):
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self.peer.hash_failed = 0 # Reset hash error counter
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while self.running:
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# Try to pickup free file download task
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task = self.pickTask()
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if not task:
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break
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if task["done"]:
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continue
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self.task = task
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self.manager.addTaskWorker(task, self)
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try:
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success = self.handleTask(task)
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except WorkerStop as err:
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self.manager.log.debug("%s: Worker stopped: %s" % (self.key, err))
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self.manager.removeTaskWorker(task, self)
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break
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self.manager.removeTaskWorker(task, self)
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self.peer.onWorkerDone()
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self.running = False
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self.manager.removeWorker(self)
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# Start the worker
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def start(self):
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self.running = True
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self.thread = gevent.spawn(self.downloader)
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# Skip current task
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def skip(self, reason="Unknown"):
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self.manager.log.debug("%s: Force skipping (reason: %s)" % (self.key, reason))
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if self.thread:
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self.thread.kill(exception=Debug.createNotifyType("Worker skipping (reason: %s)" % reason))
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self.start()
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# Force stop the worker
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def stop(self, reason="Unknown"):
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self.manager.log.debug("%s: Force stopping (reason: %s)" % (self.key, reason))
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self.running = False
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if self.thread:
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self.thread.kill(exception=Debug.createNotifyType("Worker stopped (reason: %s)" % reason))
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del self.thread
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self.manager.removeWorker(self)
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