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annotate piecrust/serving/procloop.py @ 880:342e3ea24b5d

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serve: Fix asset processing loop.
author Ludovic Chabant <ludovic@chabant.com>
date Thu, 15 Jun 2017 22:55:32 -0700
parents d1095774bfcf
children 7f1da7e7b154
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import os
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2 import os.path
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3 import time
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4 import json
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5 import queue
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6 import logging
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7 import itertools
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8 import threading
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9 from piecrust import CONFIG_PATH, THEME_CONFIG_PATH
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10 from piecrust.chefutil import format_timed_scope
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11 from piecrust.pipelines.base import (
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12 PipelineJobCreateContext, PipelineJobRunContext, PipelineJobResult,
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13 PipelineManager)
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14 from piecrust.pipelines.records import (
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15 MultiRecord, MultiRecordHistory)
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17
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18 logger = logging.getLogger(__name__)
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19
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20 # This flag is for cancelling all long running requests like SSEs.
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21 server_shutdown = False
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23
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24 class PipelineStatusServerSentEventProducer(object):
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25 """ The producer for Server-Sent Events (SSE) notifying the front-end
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26 about useful things like assets having been re-processed in the
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27 background.
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28 Each has its own queue because the user could have multiple pages
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29 open, each having to display notifications coming from the server.
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30 """
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31 def __init__(self, proc_loop):
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32 self._proc_loop = proc_loop
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33 self._queue = queue.Queue()
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34 self._start_time = 0
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35 self._poll_interval = 0.5
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36 self._ping_interval = 30
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37 self._time_between_pings = 0
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38 self._running = 0
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39
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40 def addBuildEvent(self, item):
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41 self._queue.put_nowait(item)
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42
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43 def run(self):
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44 logger.debug("Starting pipeline status SSE.")
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45 self._proc_loop.addObserver(self)
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46 self._start_time = time.time()
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47 self._running = 1
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48
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49 outstr = 'event: ping\ndata: started\n\n'
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50 yield bytes(outstr, 'utf8')
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51
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52 while self._running == 1 and not server_shutdown:
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53 try:
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54 # We use a short poll interval (less than a second) because
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55 # we need to catch `server_shutdown` going `True` as soon as
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56 # possible to exit this thread when the user hits `CTRL+C`.
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57 data = self._queue.get(True, self._poll_interval)
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58 except queue.Empty:
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59 # Not exact timing but close enough.
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60 self._time_between_pings += self._poll_interval
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61 if self._time_between_pings >= self._ping_interval:
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62 self._time_between_pings = 0
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63 logger.debug("Sending ping/heartbeat event.")
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64 outstr = 'event: ping\ndata: 1\n\n'
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65 yield bytes(outstr, 'utf8')
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66 continue
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67
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68 logger.debug("Sending pipeline status SSE.")
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69 outstr = (('event: %s\n' % data['type']) +
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70 ('id: %s\n' % data['id']) +
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71 ('data: %s\n\n' % json.dumps(data)))
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72 self._queue.task_done()
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73 yield bytes(outstr, 'utf8')
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74
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75 def close(self):
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76 logger.debug("Closing pipeline status SSE.")
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77 self._proc_loop.removeObserver(self)
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78 self._running = 2
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79
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80
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81 class _AssetProcessingInfo:
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82 def __init__(self, source):
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83 self.source = source
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84 self.paths = set()
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85 self.last_bake_time = time.time()
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86
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87
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88 class ProcessingLoop(threading.Thread):
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89 def __init__(self, appfactory, out_dir):
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90 super().__init__(name='pipeline-reloader', daemon=True)
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91 self.appfactory = appfactory
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92 self.out_dir = out_dir
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93 self.last_status_id = 0
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94 self.interval = 1
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95 self._app = None
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96 self._proc_infos = None
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97 self._last_records = None
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98 self._last_config_mtime = 0
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99 self._obs = []
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100 self._obs_lock = threading.Lock()
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101 config_name = (
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102 THEME_CONFIG_PATH if appfactory.theme_site else CONFIG_PATH)
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103 self._config_path = os.path.join(appfactory.root_dir, config_name)
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104
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105 def addObserver(self, obs):
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106 with self._obs_lock:
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107 self._obs.append(obs)
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108
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109 def removeObserver(self, obs):
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110 with self._obs_lock:
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111 self._obs.remove(obs)
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112
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113 def run(self):
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114 logger.debug("Initializing processing loop with output: %s" %
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115 self.out_dir)
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116 try:
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117 self._init()
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118 except Exception as ex:
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119 logger.error("Error initializing processing loop:")
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120 logger.exception(ex)
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121 return
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122
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123 logger.debug("Doing initial processing loop bake...")
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124 self._runPipelines()
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125
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126 logger.debug("Running processing loop...")
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127 self._last_config_mtime = os.path.getmtime(self._config_path)
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128
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129 while True:
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130 cur_config_time = os.path.getmtime(self._config_path)
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131 if self._last_config_mtime < cur_config_time:
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132 logger.info("Site configuration changed, reloading pipeline.")
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133 self._last_config_mtime = cur_config_time
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134 self._init()
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135 self._runPipelines()
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136 continue
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137
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138 for procinfo in self._proc_infos.values():
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139 # For each assets folder we try to find the first new or
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140 # modified file. If any, we just run the pipeline on
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141 # that source.
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142 found_new_or_modified = False
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143 for item in procinfo.source.getAllContents():
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144 path = item.spec
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145 if path not in procinfo.paths:
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146 logger.debug("Found new asset: %s" % path)
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147 procinfo.paths.add(path)
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148 found_new_or_modified = True
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149 break
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150 if os.path.getmtime(path) > procinfo.last_bake_time:
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151 logger.debug("Found modified asset: %s" % path)
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152 found_new_or_modified = True
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153 break
374
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154 if found_new_or_modified:
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155 with format_timed_scope(
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156 logger,
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157 "change detected, reprocessed '%s'." %
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158 procinfo.source.name):
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159 self._runPipelines(procinfo.source)
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160
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161 time.sleep(self.interval)
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162
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163 def _init(self):
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164 self._app = self.appfactory.create()
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165 self._last_records = MultiRecord()
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166
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167 self._proc_infos = {}
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168 for src in self._app.sources:
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169 if src.config['pipeline'] != 'asset':
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170 continue
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171
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172 procinfo = _AssetProcessingInfo(src)
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173 self._proc_infos[src.name] = procinfo
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174
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175 # Build the list of initial asset files.
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176 for item in src.getAllContents():
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177 procinfo.paths.add(item.spec)
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178
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179 def _runPipelines(self, only_for_source=None):
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180 current_records = MultiRecord()
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181 record_histories = MultiRecordHistory(
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182 self._last_records, current_records)
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183 ppmngr = PipelineManager(
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184 self._app, self.out_dir, record_histories)
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185
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186 # Create the pipelines, but also remember some stuff for what
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187 # we want to do.
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188 for src in self._app.sources:
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189 if src.config['pipeline'] != 'asset':
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190 continue
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191 if only_for_source is not None and src != only_for_source:
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192 continue
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193
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194 ppmngr.createPipeline(src)
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195
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196 for ppinfo in ppmngr.getPipelines():
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197 self._runPipeline(ppmngr, ppinfo)
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198
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199 self.last_status_id += 1
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200
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201 if self._last_records.success:
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202 for rec in self._last_records.records:
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203 changed = filter(
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204 lambda i: not i.was_collapsed_from_last_run,
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205 rec.getEntries())
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206 changed = itertools.chain.from_iterable(
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207 map(lambda i: i.out_paths, changed))
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208 changed = list(changed)
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209 item = {
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210 'id': self.last_status_id,
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211 'type': 'pipeline_success',
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212 'assets': changed}
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213
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214 self._notifyObservers(item)
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215 else:
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216 item = {
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217 'id': self.last_status_id,
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218 'type': 'pipeline_error',
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219 'assets': []}
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220 for rec in self._last_records.records:
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221 for entry in rec.getEntries():
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222 if entry.errors:
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223 asset_item = {
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224 'path': entry.item_spec,
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225 'errors': list(entry.errors)}
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226 item['assets'].append(asset_item)
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227
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228 self._notifyObservers(item)
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229
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230 def _runPipeline(self, ppmngr, ppinfo):
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231 src = ppinfo.source
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232 logger.debug("Running pipeline '%s' on: %s" %
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233 (ppinfo.pipeline_name, src.name))
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diff changeset
234
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235 # Set the time.
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236 procinfo = self._proc_infos[src.name]
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237 procinfo.last_bake_time = time.time()
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238
854
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239 # Process all items in the source.
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240 pp = ppinfo.pipeline
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241 cr = ppinfo.record_history.current
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242 record_histories = ppmngr.record_histories
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243 current_records = record_histories.current
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244 jobctx = PipelineJobCreateContext(0, record_histories)
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245 jobs = pp.createJobs(jobctx)
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246 for job in jobs:
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247 runctx = PipelineJobRunContext(
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248 job, pp.record_name, record_histories)
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249
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250 ppres = PipelineJobResult()
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251 ppres.record_entry = pp.createRecordEntry(job, runctx)
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252
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253 try:
860
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254 pp.run(job, runctx, ppres)
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255 except Exception as e:
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256 ppres.record_entry.errors.append(str(e))
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257
880
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258 if ppres.next_step_job is not None:
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259 logger.error("The processing loop for the server "
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260 "doesn't support multi-step pipelines.")
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261
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262 cr.addEntry(ppres.record_entry)
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263 if not ppres.record_entry.success:
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264 cr.success = False
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265 current_records.success = False
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parents: 855
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266 logger.error("Errors found in %s:" % job.content_item.spec)
854
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parents: 680
diff changeset
267 for e in ppres.record_entry.errors:
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268 logger.error(" " + e)
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269
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270 # Do all the final stuff.
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parents: 854
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271 ppmngr.postJobRun()
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diff changeset
272 ppmngr.deleteStaleOutputs()
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parents: 680
diff changeset
273 ppmngr.collapseRecords()
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274 ppmngr.shutdownPipelines()
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275
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276 # Swap the old record with the next record.
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parents: 680
diff changeset
277 pr = ppinfo.record_history.previous
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278 logger.debug("Swapping record '%s' with '%s'." % (pr.name, cr.name))
854
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279 self._last_records.records.remove(pr)
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280 self._last_records.records.append(cr)
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parents:
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281
552
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282 def _notifyObservers(self, item):
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diff changeset
283 with self._obs_lock:
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284 observers = list(self._obs)
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285 for obs in observers:
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286 obs.addBuildEvent(item)
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287