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annotate piecrust/pipelines/base.py @ 1133:fe0af94ca757

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showrecords: Tiny cosmetic change for the output.
author Ludovic Chabant <ludovic@chabant.com>
date Mon, 23 Apr 2018 21:36:22 -0700
parents 971b4d67e82a
children 5f97b5b59dfe
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1 import os.path
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2 import logging
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3 from werkzeug.utils import cached_property
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4 from piecrust.configuration import ConfigurationError
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5 from piecrust.sources.base import ContentItem
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7
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8 logger = logging.getLogger(__name__)
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9
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10
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11 class PipelineContext:
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12 """ The context for running a content pipeline.
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13 """
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14 def __init__(self, out_dir, *,
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15 worker_id=-1, force=None):
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16 self.out_dir = out_dir
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17 self.worker_id = worker_id
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18 self.force = force
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19
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20 @property
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21 def is_worker(self):
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22 """ Returns `True` if the content pipeline is running inside
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23 a worker process, and this is the first one.
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24 """
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25 return self.worker_id >= 0
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26
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27 @property
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28 def is_main_process(self):
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29 """ Returns `True` is the content pipeline is running inside
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30 the main process (and not a worker process). This is the case
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31 if there are no worker processes at all.
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32 """
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33 return self.worker_id < 0
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34
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35
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36 class _PipelineMasterProcessJobContextBase:
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37 def __init__(self, record_name, record_histories):
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38 self.record_name = record_name
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39 self.record_histories = record_histories
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40
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41 @property
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42 def previous_record(self):
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43 return self.record_histories.getPreviousRecord(self.record_name)
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44
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45 @property
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46 def current_record(self):
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47 return self.record_histories.getCurrentRecord(self.record_name)
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48
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49
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50 class PipelineJobCreateContext(_PipelineMasterProcessJobContextBase):
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51 """ Context for creating pipeline baking jobs.
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52
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53 This is run on the master process, so it can access both the
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54 previous and current records.
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55 """
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56 def __init__(self, pass_num, record_name, record_histories):
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57 super().__init__(record_name, record_histories)
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58 self.pass_num = pass_num
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59
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60
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61 class PipelineJobValidateContext(_PipelineMasterProcessJobContextBase):
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62 """ Context for validating jobs on subsequent step runs (i.e. validating
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63 the list of jobs to run starting with the second step).
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64
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65 This is run on the master process, so it can access both the
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66 previous and current records.
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67 """
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68 def __init__(self, pass_num, step_num, record_name, record_histories):
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69 super().__init__(record_name, record_histories)
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70 self.pass_num = pass_num
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71 self.step_num = step_num
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72
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73
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74 class PipelineJobRunContext:
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75 """ Context for running pipeline baking jobs.
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76
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77 This is run on the worker processes, so it can only access the
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78 previous records.
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79 """
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80 def __init__(self, job, record_name, previous_records):
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81 self.job = job
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82 self.record_name = record_name
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83 self.previous_records = previous_records
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84
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85 @cached_property
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86 def record_entry_spec(self):
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87 return self.job.get('record_entry_spec',
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88 self.job['job_spec'][1])
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89
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90 @cached_property
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91 def previous_record(self):
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92 return self.previous_records.getRecord(self.record_name)
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93
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94 @cached_property
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95 def previous_entry(self):
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96 return self.previous_record.getEntry(self.record_entry_spec)
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97
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98
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99 class PipelineJobResultHandleContext:
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100 """ The context for handling the result from a job that ran in a
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101 worker process.
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102
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103 This is run on the master process, so it can access the current
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104 record.
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105 """
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106 def __init__(self, record, job, pass_num, step_num):
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107 self.record = record
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108 self.job = job
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109 self.pass_num = pass_num
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110 self.step_num = step_num
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111
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112 @cached_property
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113 def record_entry(self):
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114 record_entry_spec = self.job.get('record_entry_spec',
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115 self.job['job_spec'][1])
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116 return self.record.getEntry(record_entry_spec)
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117
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118
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119 class PipelinePostJobRunContext:
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120 def __init__(self, record_history):
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121 self.record_history = record_history
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122
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123
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124 class PipelineDeletionContext:
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125 def __init__(self, record_history):
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126 self.record_history = record_history
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127
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128
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129 class PipelineCollapseRecordContext:
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130 def __init__(self, record_history):
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131 self.record_history = record_history
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132
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133
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134 class ContentPipeline:
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135 """ A pipeline that processes content from a `ContentSource`.
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136 """
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137 PIPELINE_NAME = None
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138 RECORD_ENTRY_CLASS = None
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139 PASS_NUM = 0
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140
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141 def __init__(self, source, ctx):
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142 self.source = source
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143 self.ctx = ctx
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144 self.record_name = '%s@%s' % (source.name, self.PIPELINE_NAME)
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145
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146 app = source.app
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147 tmp_dir = app.cache_dir
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148 if not tmp_dir:
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149 import tempfile
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150 tmp_dir = os.path.join(tempfile.gettempdir(), 'piecrust')
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151 self.tmp_dir = os.path.join(tmp_dir, self.PIPELINE_NAME)
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152
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153 @property
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154 def app(self):
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155 return self.source.app
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156
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157 def initialize(self):
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158 pass
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159
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160 def createJobs(self, ctx):
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161 return [
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162 create_job(self, item.spec)
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163 for item in self.source.getAllContents()]
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164
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165 def createRecordEntry(self, item_spec):
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166 entry_class = self.RECORD_ENTRY_CLASS
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167 record_entry = entry_class()
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168 record_entry.item_spec = item_spec
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169 return record_entry
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170
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171 def handleJobResult(self, result, ctx):
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172 raise NotImplementedError()
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173
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174 def validateNextStepJobs(self, jobs, ctx):
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175 pass
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176
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177 def run(self, job, ctx, result):
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178 raise NotImplementedError()
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179
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180 def postJobRun(self, ctx):
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181 pass
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182
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183 def getDeletions(self, ctx):
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184 pass
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185
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186 def collapseRecords(self, ctx):
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187 pass
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188
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189 def shutdown(self):
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190 pass
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191
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192
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193 def create_job(pipeline, item_spec, **kwargs):
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194 job = {
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195 'job_spec': (pipeline.source.name, item_spec)
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196 }
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197 job.update(kwargs)
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198 return job
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199
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200
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201 def content_item_from_job(pipeline, job):
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202 return pipeline.source.findContentFromSpec(job['job_spec'][1])
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203
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204
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205 def get_record_name_for_source(source):
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206 ppname = get_pipeline_name_for_source(source)
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207 return '%s@%s' % (source.name, ppname)
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208
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209
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diff changeset
210 def get_pipeline_name_for_source(source):
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diff changeset
211 pname = source.config['pipeline']
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diff changeset
212 if not pname:
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213 pname = source.DEFAULT_PIPELINE_NAME
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diff changeset
214 if not pname:
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diff changeset
215 raise ConfigurationError(
08e02c2a2a1a core: Keep refactoring, this time to prepare for generator sources.
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diff changeset
216 "Source '%s' doesn't specify any pipeline." % source.name)
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217 return pname
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diff changeset
218
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219
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diff changeset
220 class PipelineManager:
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221 def __init__(self, app, out_dir, *,
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222 record_histories=None, worker_id=-1, force=False):
854
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diff changeset
223 self.app = app
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diff changeset
224 self.record_histories = record_histories
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diff changeset
225 self.out_dir = out_dir
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226 self.worker_id = worker_id
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diff changeset
227 self.force = force
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228
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229 self._pipeline_classes = {}
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diff changeset
230 for pclass in app.plugin_loader.getPipelines():
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diff changeset
231 self._pipeline_classes[pclass.PIPELINE_NAME] = pclass
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diff changeset
232
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233 self._pipelines = {}
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diff changeset
234
08e02c2a2a1a core: Keep refactoring, this time to prepare for generator sources.
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diff changeset
235 def getPipeline(self, source_name):
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236 return self.getPipelineInfo(source_name).pipeline
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237
8adc27285d93 bake: Big pass on bake performance.
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238 def getPipelineInfo(self, source_name):
854
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diff changeset
239 return self._pipelines[source_name]
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diff changeset
240
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diff changeset
241 def getPipelineInfos(self):
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diff changeset
242 return self._pipelines.values()
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diff changeset
243
08e02c2a2a1a core: Keep refactoring, this time to prepare for generator sources.
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diff changeset
244 def createPipeline(self, source):
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diff changeset
245 if source.name in self._pipelines:
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diff changeset
246 raise ValueError("Pipeline for source '%s' was already created." %
08e02c2a2a1a core: Keep refactoring, this time to prepare for generator sources.
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diff changeset
247 source.name)
08e02c2a2a1a core: Keep refactoring, this time to prepare for generator sources.
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diff changeset
248
08e02c2a2a1a core: Keep refactoring, this time to prepare for generator sources.
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diff changeset
249 pname = get_pipeline_name_for_source(source)
08e02c2a2a1a core: Keep refactoring, this time to prepare for generator sources.
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diff changeset
250 ppctx = PipelineContext(self.out_dir,
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diff changeset
251 worker_id=self.worker_id, force=self.force)
08e02c2a2a1a core: Keep refactoring, this time to prepare for generator sources.
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diff changeset
252 pp = self._pipeline_classes[pname](source, ppctx)
08e02c2a2a1a core: Keep refactoring, this time to prepare for generator sources.
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diff changeset
253 pp.initialize()
08e02c2a2a1a core: Keep refactoring, this time to prepare for generator sources.
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diff changeset
254
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255 record_history = None
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256 if self.record_histories:
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257 record_history = self.record_histories.getHistory(pp.record_name)
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258
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259 info = _PipelineInfo(pp, record_history)
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260 self._pipelines[source.name] = info
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261 return info
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262
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263 def postJobRun(self):
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264 for ppinfo in self.getPipelineInfos():
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265 ppinfo.record_history.build()
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266
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267 for ppinfo in self.getPipelineInfos():
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268 ctx = PipelinePostJobRunContext(ppinfo.record_history)
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269 ppinfo.pipeline.postJobRun(ctx)
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270
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271 def deleteStaleOutputs(self):
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272 for ppinfo in self.getPipelineInfos():
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273 ctx = PipelineDeletionContext(ppinfo.record_history)
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274 to_delete = ppinfo.pipeline.getDeletions(ctx)
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275 current_record = ppinfo.record_history.current
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276 if to_delete is not None:
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277 for path, reason in to_delete:
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278 logger.debug("Removing '%s': %s" % (path, reason))
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279 current_record.deleted_out_paths.append(path)
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280 try:
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281 os.remove(path)
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282 except FileNotFoundError:
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283 pass
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284 logger.info('[delete] %s' % path)
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285
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286 def collapseRecords(self, keep_unused_records=False):
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287 seen_records = []
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288 for ppinfo in self.getPipelineInfos():
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289 ctx = PipelineCollapseRecordContext(ppinfo.record_history)
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290 ppinfo.pipeline.collapseRecords(ctx)
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291 seen_records.append(ppinfo.pipeline.record_name)
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292
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293 if keep_unused_records:
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294 cur_recs = self.record_histories.current
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295 prev_recs = self.record_histories.previous
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296 for prev_rec in prev_recs.records:
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297 if prev_rec.name in seen_records:
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diff changeset
298 continue
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299
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300 logger.debug("Keeping record: %s" % prev_rec.name)
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301 cur_recs.records.append(prev_rec)
854
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302
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303 def shutdownPipelines(self):
989
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304 for ppinfo in self.getPipelineInfos():
854
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diff changeset
305 ppinfo.pipeline.shutdown()
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306
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307 self._pipelines = {}
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308
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diff changeset
309
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310 class _PipelineInfo:
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311 def __init__(self, pipeline, record_history):
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312 self.pipeline = pipeline
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313 self.record_history = record_history
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314 self.userdata = None
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315
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diff changeset
316 @property
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diff changeset
317 def source(self):
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diff changeset
318 return self.pipeline.source
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diff changeset
319
08e02c2a2a1a core: Keep refactoring, this time to prepare for generator sources.
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diff changeset
320 @property
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321 def current_record(self):
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322 if self.record_history is not None:
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diff changeset
323 return self.record_history.current
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diff changeset
324 raise Exception("The current record is not available.")
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Ludovic Chabant <ludovic@chabant.com>
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diff changeset
325
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diff changeset
326 @property
854
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diff changeset
327 def pipeline_name(self):
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diff changeset
328 return self.pipeline.PIPELINE_NAME
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diff changeset
329