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annotate piecrust/workerpool.py @ 661:2f780b191541

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internal: Fix a bug with registering taxonomy terms that are not strings. Some objects, like the blog data provider's taxnonomy entries, can render as strings, but are objects themselves. When registering them as "used terms", we need to use their string representation.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 01 Mar 2016 22:26:09 -0800
parents 8073ae8cb164
children 61d606fbc313
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1 import os
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2 import sys
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3 import zlib
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4 import logging
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5 import itertools
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6 import threading
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7 import multiprocessing
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8 from piecrust.fastpickle import pickle, unpickle
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9
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10
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11 logger = logging.getLogger(__name__)
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12
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13
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14 class IWorker(object):
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15 def initialize(self):
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16 raise NotImplementedError()
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17
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18 def process(self, job):
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19 raise NotImplementedError()
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20
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21 def getReport(self):
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22 return None
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23
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24
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25 TASK_JOB = 0
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26 TASK_BATCH = 1
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27 TASK_END = 2
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29
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30 def worker_func(params):
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31 if params.is_profiling:
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32 try:
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33 import cProfile as profile
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34 except ImportError:
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35 import profile
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36
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37 params.is_profiling = False
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38 name = params.worker_class.__name__
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39 profile.runctx('_real_worker_func(params)',
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40 globals(), locals(),
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41 filename='%s-%d.prof' % (name, params.wid))
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42 else:
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43 _real_worker_func(params)
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44
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45
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46 def _real_worker_func(params):
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47 # In a context where `multiprocessing` is using the `spawn` forking model,
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48 # the new process doesn't inherit anything, so we lost all our logging
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49 # configuration here. Let's set it up again.
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50 if (hasattr(multiprocessing, 'get_start_method') and
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51 multiprocessing.get_start_method() == 'spawn'):
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52 from piecrust.main import _pre_parse_chef_args
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53 _pre_parse_chef_args(sys.argv[1:])
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54
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55 wid = params.wid
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56 logger.debug("Worker %d initializing..." % wid)
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57
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58 params.inqueue._writer.close()
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59 params.outqueue._reader.close()
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60
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61 w = params.worker_class(*params.initargs)
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62 w.wid = wid
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63 try:
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64 w.initialize()
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65 except Exception as ex:
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66 logger.error("Working failed to initialize:")
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67 logger.exception(ex)
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68 params.outqueue.put(None)
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69 return
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70
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71 get = params.inqueue.get
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72 put = params.outqueue.put
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73
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74 completed = 0
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75 while True:
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76 try:
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77 task = get()
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78 except (EOFError, OSError):
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79 logger.debug("Worker %d encountered connection problem." % wid)
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80 break
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81
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82 task_type, task_data = task
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83 if task_type == TASK_END:
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84 logger.debug("Worker %d got end task, exiting." % wid)
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85 try:
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86 rep = (task_type, True, wid, (wid, w.getReport()))
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87 except Exception as e:
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88 if params.wrap_exception:
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89 e = multiprocessing.ExceptionWithTraceback(
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90 e, e.__traceback__)
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91 rep = (task_type, False, wid, (wid, e))
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92 put(rep)
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93 break
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94
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95 if task_type == TASK_JOB:
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96 task_data = (task_data,)
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97
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98 for t in task_data:
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99 try:
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100 res = (TASK_JOB, True, wid, w.process(t))
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101 except Exception as e:
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102 if params.wrap_exception:
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103 e = multiprocessing.ExceptionWithTraceback(
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104 e, e.__traceback__)
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105 res = (TASK_JOB, False, wid, e)
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106 put(res)
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107
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108 completed += 1
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109
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110 logger.debug("Worker %d completed %d tasks." % (wid, completed))
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111
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112
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113 class _WorkerParams(object):
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114 def __init__(self, wid, inqueue, outqueue, worker_class, initargs=(),
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115 wrap_exception=False, is_profiling=False):
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116 self.wid = wid
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117 self.inqueue = inqueue
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118 self.outqueue = outqueue
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119 self.worker_class = worker_class
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120 self.initargs = initargs
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121 self.wrap_exception = wrap_exception
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122 self.is_profiling = is_profiling
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123
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124
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125 class WorkerPool(object):
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126 def __init__(self, worker_class, initargs=(),
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127 worker_count=None, batch_size=None,
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128 wrap_exception=False):
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129 worker_count = worker_count or os.cpu_count() or 1
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130
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131 use_fastqueue = True
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132 if use_fastqueue:
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133 self._task_queue = FastQueue()
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134 self._result_queue = FastQueue()
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135 self._quick_put = self._task_queue.put
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diff changeset
136 self._quick_get = self._result_queue.get
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diff changeset
137 else:
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diff changeset
138 self._task_queue = multiprocessing.SimpleQueue()
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diff changeset
139 self._result_queue = multiprocessing.SimpleQueue()
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diff changeset
140 self._quick_put = self._task_queue._writer.send
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diff changeset
141 self._quick_get = self._result_queue._reader.recv
447
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142
462
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143 self._batch_size = batch_size
447
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144 self._callback = None
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145 self._error_callback = None
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diff changeset
146 self._listener = None
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147
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148 main_module = sys.modules['__main__']
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149 is_profiling = os.path.basename(main_module.__file__) in [
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150 'profile.py', 'cProfile.py']
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151
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152 self._pool = []
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153 for i in range(worker_count):
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154 worker_params = _WorkerParams(
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diff changeset
155 i, self._task_queue, self._result_queue,
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156 worker_class, initargs,
451
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diff changeset
157 wrap_exception=wrap_exception,
447
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158 is_profiling=is_profiling)
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159 w = multiprocessing.Process(target=worker_func,
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160 args=(worker_params,))
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161 w.name = w.name.replace('Process', 'PoolWorker')
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162 w.daemon = True
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163 w.start()
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164 self._pool.append(w)
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165
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166 self._result_handler = threading.Thread(
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167 target=WorkerPool._handleResults,
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168 args=(self,))
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169 self._result_handler.daemon = True
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170 self._result_handler.start()
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171
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172 self._closed = False
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173
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174 def setHandler(self, callback=None, error_callback=None):
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175 self._callback = callback
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176 self._error_callback = error_callback
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177
460
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178 def queueJobs(self, jobs, handler=None, chunk_size=None):
447
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179 if self._closed:
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180 raise Exception("This worker pool has been closed.")
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181 if self._listener is not None:
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182 raise Exception("A previous job queue has not finished yet.")
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183
453
8351a77e13f5 bake: Don't pass the previous record entries to the workers.
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diff changeset
184 if any([not p.is_alive() for p in self._pool]):
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parents: 451
diff changeset
185 raise Exception("Some workers have prematurely exited.")
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diff changeset
186
447
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187 if handler is not None:
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188 self.setHandler(handler)
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189
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190 if not hasattr(jobs, '__len__'):
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191 jobs = list(jobs)
460
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diff changeset
192 job_count = len(jobs)
447
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193
460
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diff changeset
194 res = AsyncResult(self, job_count)
447
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parents:
diff changeset
195 if res._count == 0:
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diff changeset
196 res._event.set()
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parents:
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197 return res
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parents:
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198
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199 self._listener = res
460
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diff changeset
200
55fc8918cb75 bake: Use batched jobs in the worker pool.
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parents: 453
diff changeset
201 if chunk_size is None:
462
04abc97dd3b6 bake: Add CLI argument to specify job batch size.
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parents: 461
diff changeset
202 chunk_size = self._batch_size
04abc97dd3b6 bake: Add CLI argument to specify job batch size.
Ludovic Chabant <ludovic@chabant.com>
parents: 461
diff changeset
203 if chunk_size is None:
460
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
204 chunk_size = max(1, job_count // 50)
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
205 logger.debug("Using chunk size of %d" % chunk_size)
55fc8918cb75 bake: Use batched jobs in the worker pool.
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diff changeset
206
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parents: 453
diff changeset
207 if chunk_size is None or chunk_size == 1:
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
208 for job in jobs:
461
b015e38d4ee1 internal: Handle data serialization more under the hood.
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parents: 460
diff changeset
209 self._quick_put((TASK_JOB, job))
460
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
210 else:
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parents: 453
diff changeset
211 it = iter(jobs)
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Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
212 while True:
461
b015e38d4ee1 internal: Handle data serialization more under the hood.
Ludovic Chabant <ludovic@chabant.com>
parents: 460
diff changeset
213 batch = tuple([i for i in itertools.islice(it, chunk_size)])
460
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
214 if not batch:
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
215 break
55fc8918cb75 bake: Use batched jobs in the worker pool.
Ludovic Chabant <ludovic@chabant.com>
parents: 453
diff changeset
216 self._quick_put((TASK_BATCH, batch))
447
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parents:
diff changeset
217
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parents:
diff changeset
218 return res
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parents:
diff changeset
219
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
220 def close(self):
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
221 if self._listener is not None:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
222 raise Exception("A previous job queue has not finished yet.")
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
223
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
224 logger.debug("Closing worker pool...")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
225 handler = _ReportHandler(len(self._pool))
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
226 self._callback = handler._handle
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
227 for w in self._pool:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
228 self._quick_put((TASK_END, None))
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
229 for w in self._pool:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
230 w.join()
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
231
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
232 logger.debug("Waiting for reports...")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
233 if not handler.wait(2):
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
234 missing = handler.reports.index(None)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
235 logger.warning(
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
236 "Didn't receive all worker reports before timeout. "
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
237 "Missing report from worker %d." % missing)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
238
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
239 logger.debug("Exiting result handler thread...")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
240 self._result_queue.put(None)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
241 self._result_handler.join()
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
242 self._closed = True
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
243
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parents:
diff changeset
244 return handler.reports
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parents:
diff changeset
245
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
246 @staticmethod
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
247 def _handleResults(pool):
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parents:
diff changeset
248 while True:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
249 try:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
250 res = pool._quick_get()
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
251 except (EOFError, OSError):
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
252 logger.debug("Result handler thread encountered connection "
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
253 "problem, exiting.")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
254 return
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
255
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
256 if res is None:
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
257 logger.debug("Result handler exiting.")
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
258 break
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
259
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
260 task_type, success, wid, data = res
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
261 try:
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
262 if success and pool._callback:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
263 pool._callback(data)
451
838f3964f400 bake: Optimize the bake by not using custom classes for passing info.
Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
264 elif not success:
838f3964f400 bake: Optimize the bake by not using custom classes for passing info.
Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
265 if pool._error_callback:
838f3964f400 bake: Optimize the bake by not using custom classes for passing info.
Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
266 pool._error_callback(data)
838f3964f400 bake: Optimize the bake by not using custom classes for passing info.
Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
267 else:
838f3964f400 bake: Optimize the bake by not using custom classes for passing info.
Ludovic Chabant <ludovic@chabant.com>
parents: 447
diff changeset
268 logger.error(data)
447
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
269 except Exception as ex:
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Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
270 logger.exception(ex)
aefe70229fdd bake: Commonize worker pool code between html and asset baking.
Ludovic Chabant <ludovic@chabant.com>
parents:
diff changeset
271
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272 if task_type == TASK_JOB:
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273 pool._listener._onTaskDone()
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274
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275
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276 class AsyncResult(object):
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277 def __init__(self, pool, count):
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278 self._pool = pool
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279 self._count = count
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280 self._event = threading.Event()
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281
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282 def ready(self):
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283 return self._event.is_set()
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284
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285 def wait(self, timeout=None):
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286 return self._event.wait(timeout)
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287
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288 def _onTaskDone(self):
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289 self._count -= 1
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290 if self._count == 0:
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291 self._pool.setHandler(None)
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292 self._pool._listener = None
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293 self._event.set()
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294
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295
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296 class _ReportHandler(object):
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297 def __init__(self, worker_count):
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298 self.reports = [None] * worker_count
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299 self._count = worker_count
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300 self._received = 0
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301 self._event = threading.Event()
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302
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303 def wait(self, timeout=None):
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304 return self._event.wait(timeout)
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305
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306 def _handle(self, res):
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307 wid, data = res
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308 if wid < 0 or wid > self._count:
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309 logger.error("Ignoring report from unknown worker %d." % wid)
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310 return
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311
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312 self._received += 1
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313 self.reports[wid] = data
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314
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315 if self._received == self._count:
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316 self._event.set()
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317
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318 def _handleError(self, res):
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319 wid, data = res
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320 logger.error("Worker %d failed to send its report." % wid)
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321 logger.exception(data)
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322
461
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323
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324 class FastQueue(object):
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325 def __init__(self, compress=False):
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326 self._reader, self._writer = multiprocessing.Pipe(duplex=False)
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327 self._rlock = multiprocessing.Lock()
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328 self._wlock = multiprocessing.Lock()
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329 self._compress = compress
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330
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331 def __getstate__(self):
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332 return (self._reader, self._writer, self._rlock, self._wlock,
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333 self._compress)
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334
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335 def __setstate__(self, state):
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336 (self._reader, self._writer, self._rlock, self._wlock,
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337 self._compress) = state
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338
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339 def get(self):
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340 with self._rlock:
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341 raw = self._reader.recv_bytes()
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342 if self._compress:
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343 data = zlib.decompress(raw)
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344 else:
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345 data = raw
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346 obj = unpickle(data)
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347 return obj
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348
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349 def put(self, obj):
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350 data = pickle(obj)
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351 if self._compress:
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352 raw = zlib.compress(data)
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353 else:
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354 raw = data
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355 with self._wlock:
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356 self._writer.send_bytes(raw)
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357