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annotate piecrust/baking/worker.py @ 852:4850f8c21b6e

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core: Start of the big refactor for PieCrust 3.0. * Everything is a `ContentSource`, including assets directories. * Most content sources are subclasses of the base file-system source. * A source is processed by a "pipeline", and there are 2 built-in pipelines, one for assets and one for pages. The asset pipeline is vaguely functional, but the page pipeline is completely broken right now. * Rewrite the baking process as just running appropriate pipelines on each content item. This should allow for better parallelization.
author Ludovic Chabant <ludovic@chabant.com>
date Wed, 17 May 2017 00:11:48 -0700
parents c3cb2f9df882
children f070a4fc033c
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1 import time
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2 import logging
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3 from piecrust.pipelines.base import PipelineContext, PipelineResult
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4 from piecrust.pipelines.records import (
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5 MultiRecordHistory, MultiRecord, Record, load_records)
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6 from piecrust.sources.base import ContentItem
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7 from piecrust.workerpool import IWorker
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8
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9
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10 logger = logging.getLogger(__name__)
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11
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12
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13 class BakeWorkerContext(object):
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14 def __init__(self, appfactory, out_dir, *,
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15 force=False, previous_records_path=None,
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16 allowed_pipelines=None):
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17 self.appfactory = appfactory
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18 self.out_dir = out_dir
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19 self.force = force
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20 self.previous_records_path = previous_records_path
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21 self.allowed_pipelines = allowed_pipelines
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23
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24 class BakeWorker(IWorker):
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25 def __init__(self, ctx):
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26 self.ctx = ctx
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27 self.app = None
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28 self.record_history = None
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29 self._work_start_time = time.perf_counter()
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30 self._sources = {}
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31 self._ppctx = None
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32
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33 def initialize(self):
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34 # Create the app local to this worker.
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35 app = self.ctx.appfactory.create()
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36 app.config.set('baker/is_baking', True)
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37 app.config.set('baker/worker_id', self.wid)
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38 app.config.set('site/base_asset_url_format', '%uri')
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39
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40 app.env.fs_cache_only_for_main_page = True
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41
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42 stats = app.env.stats
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43 stats.registerTimer("BakeWorker_%d_Total" % self.wid)
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44 stats.registerTimer("BakeWorkerInit")
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45 stats.registerTimer("JobReceive")
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46 stats.registerTimer('LoadJob', raise_if_registered=False)
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47 stats.registerTimer('RenderFirstSubJob',
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48 raise_if_registered=False)
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49 stats.registerTimer('BakeJob', raise_if_registered=False)
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50
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51 stats.registerCounter("SourceUseAbortions")
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52
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53 stats.registerManifest("LoadJobs")
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54 stats.registerManifest("RenderJobs")
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55 stats.registerManifest("BakeJobs")
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56
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57 self.app = app
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58
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59 # Load previous record
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60 if self.ctx.previous_records_path:
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61 previous_records = load_records(self.ctx.previous_records_path)
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62 else:
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63 previous_records = MultiRecord()
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64 current_records = MultiRecord()
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65 self.record_history = MultiRecordHistory(
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66 previous_records, current_records)
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67
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68 # Cache sources and create pipelines.
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69 ppclasses = {}
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70 for ppclass in app.plugin_loader.getPipelines():
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71 ppclasses[ppclass.PIPELINE_NAME] = ppclass
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72
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73 self._ppctx = PipelineContext(self.ctx.out_dir, self.record_history,
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74 worker_id=self.wid,
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75 force=self.ctx.force)
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76 for src in app.sources:
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77 ppname = src.config['pipeline']
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78 if (self.ctx.allowed_pipelines is not None and
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79 ppname not in self.ctx.allowed_pipelines):
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80 continue
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81
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82 pp = ppclasses[ppname](src)
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83 pp.initialize(self._ppctx)
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84 self._sources[src.name] = (src, pp)
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85
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86 stats.stepTimerSince("BakeWorkerInit", self._work_start_time)
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87
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88 def process(self, job):
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89 logger.debug("Received job: %s@%s" % (job.source_name, job.item_spec))
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90 src, pp = self._sources[job.source_name]
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91 item = ContentItem(job.item_spec, job.item_metadata)
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92
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93 record_class = pp.RECORD_CLASS or Record
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94 ppres = PipelineResult(record_class())
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95 ppres.record.item_spec = job.item_spec
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96 pp.run(item, self._ppctx, ppres)
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97 return ppres
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98
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99 def getStats(self):
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100 stats = self.app.env.stats
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101 stats.stepTimerSince("BakeWorker_%d_Total" % self.wid,
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102 self._work_start_time)
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103 return stats
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104
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105 def shutdown(self):
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106 for src, pp in self._sources.values():
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107 pp.shutdown(self._ppctx)
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108
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109
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110 class BakeJob:
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111 def __init__(self, source_name, item_spec, item_metadata):
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112 self.source_name = source_name
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113 self.item_spec = item_spec
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114 self.item_metadata = item_metadata
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115
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116
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117 class JobHandler:
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118 def __init__(self, ctx):
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119 self.ctx = ctx
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120
453
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121 @property
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122 def app(self):
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123 return self.ctx.app
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124
411
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125 def handleJob(self, job):
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126 raise NotImplementedError()
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127
702
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128 def shutdown(self):
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129 pass
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130
411
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131
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132 def _get_errors(ex):
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133 errors = []
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134 while ex is not None:
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135 errors.append(str(ex))
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136 ex = ex.__cause__
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137 return errors
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138