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annotate piecrust/workerpool.py @ 853:f070a4fc033c

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core: Continue PieCrust3 refactor, simplify pages. The asset pipeline is still the only function pipeline at this point. * No more `QualifiedPage`, and several other pieces of code deleted. * Data providers are simpler and more focused. For instance, the page iterator doesn't try to support other types of items. * Route parameters are proper known source metadata to remove the confusion between the two. * Make the baker and pipeline more correctly manage records and record histories. * Add support for record collapsing and deleting stale outputs in the asset pipeline.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 21 May 2017 00:06:59 -0700
parents 4850f8c21b6e
children 08e02c2a2a1a
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rev   line source
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1 import io
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2 import os
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3 import sys
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4 import time
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5 import pickle
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6 import logging
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7 import threading
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8 import traceback
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9 import multiprocessing
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10 from piecrust import fastpickle
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11 from piecrust.environment import ExecutionStats
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13
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14 logger = logging.getLogger(__name__)
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15
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16 use_fastqueue = True
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17 use_fastpickle = False
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19
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20 class IWorker(object):
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21 """ Interface for a pool worker.
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22 """
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23 def initialize(self):
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24 raise NotImplementedError()
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25
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26 def process(self, job):
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27 raise NotImplementedError()
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28
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29 def getStats(self):
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30 return None
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31
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32 def shutdown(self):
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33 pass
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36 class WorkerExceptionData:
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37 def __init__(self, wid):
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38 super().__init__()
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39 self.wid = wid
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40 t, v, tb = sys.exc_info()
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41 self.type = t
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42 self.value = '\n'.join(_get_errors(v))
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43 self.traceback = ''.join(traceback.format_exception(t, v, tb))
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44
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45 def __str__(self):
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46 return str(self.value)
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48
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49 def _get_errors(ex):
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50 errors = []
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51 while ex is not None:
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52 msg = str(ex)
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53 errors.append(msg)
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54 ex = ex.__cause__
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55 return errors
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56
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57
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58 TASK_JOB = 0
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59 TASK_END = 1
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61
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62 def worker_func(params):
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63 if params.is_profiling:
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64 try:
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65 import cProfile as profile
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66 except ImportError:
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67 import profile
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68
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69 params.is_profiling = False
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70 name = params.worker_class.__name__
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71 profile.runctx('_real_worker_func(params)',
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72 globals(), locals(),
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73 filename='%s-%d.prof' % (name, params.wid))
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74 else:
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75 _real_worker_func(params)
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76
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77
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78 def _real_worker_func(params):
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79 wid = params.wid
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80
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81 stats = ExecutionStats()
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82 stats.registerTimer('WorkerInit')
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83 init_start_time = time.perf_counter()
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84
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85 # In a context where `multiprocessing` is using the `spawn` forking model,
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86 # the new process doesn't inherit anything, so we lost all our logging
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87 # configuration here. Let's set it up again.
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88 if (hasattr(multiprocessing, 'get_start_method') and
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89 multiprocessing.get_start_method() == 'spawn'):
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90 from piecrust.main import _pre_parse_chef_args
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91 _pre_parse_chef_args(sys.argv[1:])
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92
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93 logger.debug("Worker %d initializing..." % wid)
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94
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95 # We don't need those.
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96 params.inqueue._writer.close()
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97 params.outqueue._reader.close()
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98
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99 # Initialize the underlying worker class.
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100 w = params.worker_class(*params.initargs)
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101 w.wid = wid
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102 try:
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103 w.initialize()
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104 except Exception as ex:
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105 logger.error("Working failed to initialize:")
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106 logger.exception(ex)
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107 params.outqueue.put(None)
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108 return
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109
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110 stats.stepTimerSince('WorkerInit', init_start_time)
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111
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112 # Start pumping!
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113 completed = 0
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114 time_in_get = 0
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115 time_in_put = 0
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116 get = params.inqueue.get
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117 put = params.outqueue.put
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118
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119 while True:
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120 get_start_time = time.perf_counter()
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121 task = get()
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122 time_in_get += (time.perf_counter() - get_start_time)
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123
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124 task_type, task_data = task
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125
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126 # End task... gather stats to send back to the main process.
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127 if task_type == TASK_END:
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128 logger.debug("Worker %d got end task, exiting." % wid)
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129 stats.registerTimer('WorkerTaskGet', time=time_in_get)
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130 stats.registerTimer('WorkerResultPut', time=time_in_put)
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131 try:
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132 stats.mergeStats(w.getStats())
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133 rep = (task_type, task_data, True, wid, (wid, stats))
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134 except Exception as e:
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135 logger.debug(
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136 "Error getting report, sending exception to main process:")
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137 logger.debug(traceback.format_exc())
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138 we = WorkerExceptionData(wid)
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139 rep = (task_type, task_data, False, wid, (wid, we))
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140 put(rep)
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141 break
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142
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143 # Job task... just do it.
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144 elif task_type == TASK_JOB:
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diff changeset
145 try:
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146 res = (task_type, task_data, True, wid, w.process(task_data))
460
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147 except Exception as e:
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148 logger.debug(
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149 "Error processing job, sending exception to main process:")
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150 logger.debug(traceback.format_exc())
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151 we = WorkerExceptionData(wid)
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152 res = (task_type, task_data, False, wid, we)
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153
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154 put_start_time = time.perf_counter()
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155 put(res)
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156 time_in_put += (time.perf_counter() - put_start_time)
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157
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158 completed += 1
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159
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160 else:
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161 raise Exception("Unknown task type: %s" % task_type)
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162
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163 w.shutdown()
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164 logger.debug("Worker %d completed %d tasks." % (wid, completed))
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165
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166
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167 class _WorkerParams:
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168 def __init__(self, wid, inqueue, outqueue, worker_class, initargs=(),
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169 is_profiling=False):
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170 self.wid = wid
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171 self.inqueue = inqueue
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172 self.outqueue = outqueue
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173 self.worker_class = worker_class
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174 self.initargs = initargs
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175 self.is_profiling = is_profiling
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176
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177
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178 class WorkerPool:
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179 def __init__(self, worker_class, initargs=(), *,
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180 callback=None, error_callback=None,
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181 worker_count=None, batch_size=None):
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182 worker_count = worker_count or os.cpu_count() or 1
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183
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184 if use_fastqueue:
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185 self._task_queue = FastQueue()
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186 self._result_queue = FastQueue()
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187 self._quick_put = self._task_queue.put
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188 self._quick_get = self._result_queue.get
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189 else:
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190 self._task_queue = multiprocessing.SimpleQueue()
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191 self._result_queue = multiprocessing.SimpleQueue()
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192 self._quick_put = self._task_queue._writer.send
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193 self._quick_get = self._result_queue._reader.recv
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194
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195 self._callback = callback
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196 self._error_callback = error_callback
462
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197 self._batch_size = batch_size
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198 self._jobs_left = 0
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199 self._event = threading.Event()
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200
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201 main_module = sys.modules['__main__']
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202 is_profiling = os.path.basename(main_module.__file__) in [
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diff changeset
203 'profile.py', 'cProfile.py']
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204
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205 self._pool = []
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206 for i in range(worker_count):
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207 worker_params = _WorkerParams(
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diff changeset
208 i, self._task_queue, self._result_queue,
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diff changeset
209 worker_class, initargs,
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diff changeset
210 is_profiling=is_profiling)
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211 w = multiprocessing.Process(target=worker_func,
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212 args=(worker_params,))
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213 w.name = w.name.replace('Process', 'PoolWorker')
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214 w.daemon = True
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215 w.start()
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216 self._pool.append(w)
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217
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218 self._result_handler = threading.Thread(
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diff changeset
219 target=WorkerPool._handleResults,
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diff changeset
220 args=(self,))
447
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221 self._result_handler.daemon = True
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222 self._result_handler.start()
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223
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224 self._closed = False
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225
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226 def queueJobs(self, jobs):
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227 if self._closed:
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228 raise Exception("This worker pool has been closed.")
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229
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230 for job in jobs:
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diff changeset
231 self._jobs_left += 1
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diff changeset
232 self._quick_put((TASK_JOB, job))
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233
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diff changeset
234 if self._jobs_left > 0:
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235 self._event.clear()
460
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diff changeset
236
852
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diff changeset
237 def wait(self, timeout=None):
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diff changeset
238 return self._event.wait(timeout)
447
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239
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240 def close(self):
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diff changeset
241 if self._jobs_left > 0 or not self._event.is_set():
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242 raise Exception("A previous job queue has not finished yet.")
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243
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244 logger.debug("Closing worker pool...")
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245 handler = _ReportHandler(len(self._pool))
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246 self._callback = handler._handle
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diff changeset
247 self._error_callback = handler._handleError
447
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248 for w in self._pool:
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249 self._quick_put((TASK_END, None))
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250 for w in self._pool:
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251 w.join()
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252
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253 logger.debug("Waiting for reports...")
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diff changeset
254 if not handler.wait(2):
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diff changeset
255 missing = handler.reports.index(None)
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256 logger.warning(
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257 "Didn't receive all worker reports before timeout. "
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258 "Missing report from worker %d." % missing)
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259
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260 logger.debug("Exiting result handler thread...")
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261 self._result_queue.put(None)
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262 self._result_handler.join()
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263 self._closed = True
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264
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265 return handler.reports
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266
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267 def _onTaskDone(self):
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268 self._jobs_left -= 1
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269 if self._jobs_left == 0:
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270 self._event.set()
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271
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272 @staticmethod
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273 def _handleResults(pool):
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274 while True:
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275 try:
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276 res = pool._quick_get()
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277 except (EOFError, OSError):
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278 logger.debug("Result handler thread encountered connection "
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279 "problem, exiting.")
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280 return
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281
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282 if res is None:
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283 logger.debug("Result handler exiting.")
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284 break
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285
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286 task_type, task_data, success, wid, data = res
447
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287 try:
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288 if success:
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289 if pool._callback:
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290 pool._callback(task_data, data)
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291 else:
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292 if pool._error_callback:
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293 pool._error_callback(task_data, data)
451
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294 else:
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295 logger.error(
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296 "Worker %d failed to process a job:" % wid)
451
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297 logger.error(data)
447
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298 except Exception as ex:
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299 logger.exception(ex)
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300
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301 if task_type == TASK_JOB:
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302 pool._onTaskDone()
447
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303
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304
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305 class _ReportHandler:
447
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306 def __init__(self, worker_count):
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307 self.reports = [None] * worker_count
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308 self._count = worker_count
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diff changeset
309 self._received = 0
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310 self._event = threading.Event()
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311
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312 def wait(self, timeout=None):
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313 return self._event.wait(timeout)
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diff changeset
314
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diff changeset
315 def _handle(self, job, res):
447
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diff changeset
316 wid, data = res
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diff changeset
317 if wid < 0 or wid > self._count:
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diff changeset
318 logger.error("Ignoring report from unknown worker %d." % wid)
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diff changeset
319 return
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diff changeset
320
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diff changeset
321 self._received += 1
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322 self.reports[wid] = data
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parents:
diff changeset
323
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parents:
diff changeset
324 if self._received == self._count:
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diff changeset
325 self._event.set()
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diff changeset
326
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diff changeset
327 def _handleError(self, job, res):
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diff changeset
328 logger.error("Worker %d failed to send its report." % res.wid)
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diff changeset
329 logger.error(res)
447
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diff changeset
330
461
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diff changeset
331
852
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diff changeset
332 class FastQueue:
691
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diff changeset
333 def __init__(self):
461
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diff changeset
334 self._reader, self._writer = multiprocessing.Pipe(duplex=False)
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diff changeset
335 self._rlock = multiprocessing.Lock()
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diff changeset
336 self._wlock = multiprocessing.Lock()
697
9e5393fcfab2 bake: Re-enable faster serialization between processes.
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diff changeset
337 self._initBuffers()
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diff changeset
338
9e5393fcfab2 bake: Re-enable faster serialization between processes.
Ludovic Chabant <ludovic@chabant.com>
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diff changeset
339 def _initBuffers(self):
691
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Ludovic Chabant <ludovic@chabant.com>
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diff changeset
340 self._rbuf = io.BytesIO()
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Ludovic Chabant <ludovic@chabant.com>
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diff changeset
341 self._rbuf.truncate(256)
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Ludovic Chabant <ludovic@chabant.com>
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diff changeset
342 self._wbuf = io.BytesIO()
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Ludovic Chabant <ludovic@chabant.com>
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343 self._wbuf.truncate(256)
461
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diff changeset
344
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diff changeset
345 def __getstate__(self):
691
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346 return (self._reader, self._writer, self._rlock, self._wlock)
461
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diff changeset
347
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diff changeset
348 def __setstate__(self, state):
691
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diff changeset
349 (self._reader, self._writer, self._rlock, self._wlock) = state
697
9e5393fcfab2 bake: Re-enable faster serialization between processes.
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diff changeset
350 self._initBuffers()
461
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diff changeset
351
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diff changeset
352 def get(self):
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diff changeset
353 with self._rlock:
691
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diff changeset
354 try:
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Ludovic Chabant <ludovic@chabant.com>
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diff changeset
355 with self._rbuf.getbuffer() as b:
697
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diff changeset
356 bufsize = self._reader.recv_bytes_into(b)
691
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Ludovic Chabant <ludovic@chabant.com>
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diff changeset
357 except multiprocessing.BufferTooShort as e:
697
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diff changeset
358 bufsize = len(e.args[0])
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diff changeset
359 self._rbuf.truncate(bufsize * 2)
691
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diff changeset
360 self._rbuf.seek(0)
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diff changeset
361 self._rbuf.write(e.args[0])
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diff changeset
362
9ae9390192da bake: Use standard pickle and queue for now to fix some small issues.
Ludovic Chabant <ludovic@chabant.com>
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diff changeset
363 self._rbuf.seek(0)
852
4850f8c21b6e core: Start of the big refactor for PieCrust 3.0.
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parents: 702
diff changeset
364 return _unpickle(self._rbuf, bufsize)
461
b015e38d4ee1 internal: Handle data serialization more under the hood.
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parents: 460
diff changeset
365
b015e38d4ee1 internal: Handle data serialization more under the hood.
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diff changeset
366 def put(self, obj):
691
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Ludovic Chabant <ludovic@chabant.com>
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diff changeset
367 self._wbuf.seek(0)
852
4850f8c21b6e core: Start of the big refactor for PieCrust 3.0.
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diff changeset
368 _pickle(obj, self._wbuf)
691
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
369 size = self._wbuf.tell()
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diff changeset
370
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Ludovic Chabant <ludovic@chabant.com>
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diff changeset
371 self._wbuf.seek(0)
461
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diff changeset
372 with self._wlock:
691
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Ludovic Chabant <ludovic@chabant.com>
parents: 687
diff changeset
373 with self._wbuf.getbuffer() as b:
9ae9390192da bake: Use standard pickle and queue for now to fix some small issues.
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parents: 687
diff changeset
374 self._writer.send_bytes(b, 0, size)
461
b015e38d4ee1 internal: Handle data serialization more under the hood.
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parents: 460
diff changeset
375
852
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diff changeset
376
4850f8c21b6e core: Start of the big refactor for PieCrust 3.0.
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diff changeset
377 def _pickle_fast(obj, buf):
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Ludovic Chabant <ludovic@chabant.com>
parents: 702
diff changeset
378 fastpickle.pickle_intob(obj, buf)
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diff changeset
379
4850f8c21b6e core: Start of the big refactor for PieCrust 3.0.
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diff changeset
380
4850f8c21b6e core: Start of the big refactor for PieCrust 3.0.
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diff changeset
381 def _unpickle_fast(buf, bufsize):
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diff changeset
382 return fastpickle.unpickle_fromb(buf, bufsize)
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parents: 702
diff changeset
383
4850f8c21b6e core: Start of the big refactor for PieCrust 3.0.
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parents: 702
diff changeset
384
4850f8c21b6e core: Start of the big refactor for PieCrust 3.0.
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diff changeset
385 def _pickle_default(obj, buf):
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parents: 702
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386 pickle.dump(obj, buf)
691
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parents: 687
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387
852
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parents: 702
diff changeset
388
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parents: 702
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389 def _unpickle_default(buf, bufsize):
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Ludovic Chabant <ludovic@chabant.com>
parents: 702
diff changeset
390 return pickle.load(buf)
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parents: 702
diff changeset
391
691
9ae9390192da bake: Use standard pickle and queue for now to fix some small issues.
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parents: 687
diff changeset
392
852
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parents: 702
diff changeset
393 if use_fastpickle:
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parents: 702
diff changeset
394 _pickle = _pickle_fast
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parents: 702
diff changeset
395 _unpickle = _unpickle_fast
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Ludovic Chabant <ludovic@chabant.com>
parents: 702
diff changeset
396 else:
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Ludovic Chabant <ludovic@chabant.com>
parents: 702
diff changeset
397 _pickle = _pickle_default
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Ludovic Chabant <ludovic@chabant.com>
parents: 702
diff changeset
398 _unpickle = _unpickle_default
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Ludovic Chabant <ludovic@chabant.com>
parents: 702
diff changeset
399