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annotate piecrust/processing/base.py @ 120:133845647083

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Better error management and removal support in baking/processing. * Baker and processor pipeline now store errors in their records. * They also support deleting output files that are no longer valid. * The basic transitional record class implements more boilerplate code. * The processor pipeline is run from the `bake` command directly. * New unit tests. * Unit test mocking now mocks `os.remove` too.
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 09 Nov 2014 14:46:23 -0800
parents 6827dcc9d3fb
children e5cba2622d26
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1 import re
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2 import time
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3 import shutil
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4 import os.path
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5 import logging
120
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6 import hashlib
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7 import threading
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8 from queue import Queue, Empty
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9 from piecrust.chefutil import format_timed
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10 from piecrust.processing.records import (
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11 ProcessorPipelineRecordEntry, TransitionalProcessorPipelineRecord,
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12 FLAG_PROCESSED, FLAG_OVERRIDEN)
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13 from piecrust.processing.tree import (ProcessingTreeBuilder,
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14 ProcessingTreeRunner, ProcessingTreeError, STATE_DIRTY, print_node)
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17 logger = logging.getLogger(__name__)
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19
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20 PRIORITY_FIRST = -1
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21 PRIORITY_NORMAL = 0
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22 PRIORITY_LAST = 1
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25 class Processor(object):
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26 PROCESSOR_NAME = None
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27
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28 def __init__(self):
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29 self.priority = PRIORITY_NORMAL
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30 self.is_bypassing_structured_processing = False
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31 self.is_delegating_dependency_check = True
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33 def initialize(self, app):
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34 self.app = app
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35
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36 def onPipelineStart(self, pipeline):
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37 pass
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38
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39 def onPipelineEnd(self, pipeline):
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40 pass
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41
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42 def matches(self, path):
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43 return False
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44
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45 def getDependencies(self, path):
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46 return None
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47
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48 def getOutputFilenames(self, filename):
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49 return None
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50
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51 def process(self, path, out_dir):
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52 pass
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55 class CopyFileProcessor(Processor):
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56 PROCESSOR_NAME = 'copy'
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57
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58 def __init__(self):
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59 super(CopyFileProcessor, self).__init__()
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60 self.priority = PRIORITY_LAST
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61
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62 def matches(self, path):
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63 return True
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64
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65 def getOutputFilenames(self, filename):
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66 return [filename]
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68 def process(self, path, out_dir):
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69 out_path = os.path.join(out_dir, os.path.basename(path))
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70 logger.debug("Copying: %s -> %s" % (path, out_path))
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71 shutil.copyfile(path, out_path)
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72 return True
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75 class SimpleFileProcessor(Processor):
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76 def __init__(self, extensions=None):
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77 super(SimpleFileProcessor, self).__init__()
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78 self.extensions = extensions or {}
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79
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80 def matches(self, path):
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81 for ext in self.extensions:
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82 if path.endswith('.' + ext):
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83 return True
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84 return False
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85
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86 def getOutputFilenames(self, filename):
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87 basename, ext = os.path.splitext(filename)
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88 ext = ext.lstrip('.')
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89 out_ext = self.extensions[ext]
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90 return ['%s.%s' % (basename, out_ext)]
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91
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92 def process(self, path, out_dir):
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93 _, in_name = os.path.split(path)
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94 out_name = self.getOutputFilenames(in_name)[0]
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95 out_path = os.path.join(out_dir, out_name)
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96 return self._doProcess(path, out_path)
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97
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98 def _doProcess(self, in_path, out_path):
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99 raise NotImplementedError()
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100
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101
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102 class ProcessingContext(object):
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103 def __init__(self, base_dir, job_queue, record=None):
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104 self.base_dir = base_dir
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105 self.job_queue = job_queue
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106 self.record = record
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107
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108
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109 class ProcessorPipeline(object):
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110 def __init__(self, app, mounts, out_dir, force=False,
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111 skip_patterns=None, force_patterns=None, num_workers=4):
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112 self.app = app
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113 self.mounts = mounts
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114 tmp_dir = app.cache_dir
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115 if not tmp_dir:
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116 import tempfile
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117 tmp_dir = os.path.join(tempfile.gettempdir(), 'piecrust')
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118 self.tmp_dir = os.path.join(tmp_dir, 'proc')
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119 self.out_dir = out_dir
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120 self.force = force
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121 self.skip_patterns = skip_patterns or []
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122 self.force_patterns = force_patterns or []
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123 self.processors = app.plugin_loader.getProcessors()
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124 self.num_workers = num_workers
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125
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126 self.skip_patterns += ['_cache', '_counter',
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127 'theme_info.yml',
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128 '.DS_Store', 'Thumbs.db',
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129 '.git*', '.hg*', '.svn']
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130
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131 self.skip_patterns = make_re(self.skip_patterns)
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132 self.force_patterns = make_re(self.force_patterns)
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133
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134 def filterProcessors(self, authorized_names):
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135 self.processors = list(filter(
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136 lambda p: p.PROCESSOR_NAME in authorized_names,
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137 self.processors))
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138
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139 def run(self, src_dir_or_file=None):
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140 # Invoke pre-processors.
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141 for proc in self.processors:
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142 proc.onPipelineStart(self)
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143
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144 # Sort our processors again in case the pre-process step involved
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145 # patching the processors with some new ones.
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146 self.processors.sort(key=lambda p: p.priority)
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147
120
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148 # Create the pipeline record.
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149 record = TransitionalProcessorPipelineRecord()
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150 record_cache = self.app.cache.getCache('baker')
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151 record_name = (
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152 'assets_' +
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153 hashlib.md5(self.out_dir.encode('utf8')).hexdigest() +
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154 '.record')
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155 if not self.force and record_cache.has(record_name):
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156 t = time.clock()
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157 record.loadPrevious(record_cache.getCachePath(record_name))
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158 logger.debug(format_timed(t, 'loaded previous bake record',
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159 colored=False))
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160
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161 # Create the workers.
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162 pool = []
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163 queue = Queue()
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164 abort = threading.Event()
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165 pipeline_lock = threading.Lock()
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166 for i in range(self.num_workers):
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167 ctx = ProcessingWorkerContext(self, record,
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168 queue, abort, pipeline_lock)
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169 worker = ProcessingWorker(i, ctx)
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170 worker.start()
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171 pool.append(worker)
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172
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173 if src_dir_or_file is not None:
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174 # Process only the given path.
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175 # Find out what mount point this is in.
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176 for path in self.mounts:
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177 if src_dir_or_file[:len(path)] == path:
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178 base_dir = path
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179 break
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180 else:
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181 raise Exception("Input path '%s' is not part of any known "
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182 "mount point: %s" %
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183 (src_dir_or_file, self.mounts))
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184
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185 ctx = ProcessingContext(base_dir, queue, record)
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186 logger.debug("Initiating processing pipeline on: %s" % src_dir_or_file)
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187 if os.path.isdir(src_dir_or_file):
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188 self.processDirectory(ctx, src_dir_or_file)
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189 elif os.path.isfile(src_dir_or_file):
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190 self.processFile(ctx, src_dir_or_file)
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191
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192 else:
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193 # Process everything.
36
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194 for path in self.mounts:
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195 ctx = ProcessingContext(path, queue, record)
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196 logger.debug("Initiating processing pipeline on: %s" % path)
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197 self.processDirectory(ctx, path)
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198
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199 # Wait on all workers.
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200 for w in pool:
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201 w.join()
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202 if abort.is_set():
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203 raise Exception("Worker pool was aborted.")
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204
120
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205 # Handle deletions.
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206 for path, reason in record.getDeletions():
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207 logger.debug("Removing '%s': %s" % (path, reason))
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208 os.remove(path)
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209 logger.info('[delete] %s' % path)
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210
3
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211 # Invoke post-processors.
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212 for proc in self.processors:
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213 proc.onPipelineEnd(self)
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214
120
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215 # Save the process record.
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216 t = time.clock()
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217 record.current.process_time = time.time()
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218 record.current.out_dir = self.out_dir
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219 record.collapseRecords()
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220 record.saveCurrent(record_cache.getCachePath(record_name))
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221 logger.debug(format_timed(t, 'saved bake record', colored=False))
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222
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223 return record
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224
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225 def processDirectory(self, ctx, start_dir):
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226 for dirpath, dirnames, filenames in os.walk(start_dir):
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227 rel_dirpath = os.path.relpath(dirpath, start_dir)
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228 dirnames[:] = [d for d in dirnames
35
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diff changeset
229 if not re_matchany(d, self.skip_patterns, rel_dirpath)]
3
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230
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231 for filename in filenames:
35
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diff changeset
232 if re_matchany(filename, self.skip_patterns, rel_dirpath):
3
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233 continue
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234 self.processFile(ctx, os.path.join(dirpath, filename))
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235
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236 def processFile(self, ctx, path):
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237 logger.debug("Queuing: %s" % path)
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238 job = ProcessingWorkerJob(ctx.base_dir, path)
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239 ctx.job_queue.put_nowait(job)
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240
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241
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242 class ProcessingWorkerContext(object):
120
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243 def __init__(self, pipeline, record,
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244 work_queue, abort_event, pipeline_lock):
3
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245 self.pipeline = pipeline
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246 self.record = record
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247 self.work_queue = work_queue
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248 self.abort_event = abort_event
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249 self.pipeline_lock = pipeline_lock
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250
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251
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252 class ProcessingWorkerJob(object):
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253 def __init__(self, base_dir, path):
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254 self.base_dir = base_dir
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255 self.path = path
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256
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257
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258 class ProcessingWorker(threading.Thread):
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259 def __init__(self, wid, ctx):
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260 super(ProcessingWorker, self).__init__()
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261 self.wid = wid
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262 self.ctx = ctx
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263
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264 def run(self):
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265 while(not self.ctx.abort_event.is_set()):
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266 try:
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267 job = self.ctx.work_queue.get(True, 0.1)
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268 except Empty:
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diff changeset
269 logger.debug("[%d] No more work... shutting down." % self.wid)
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270 break
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271
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272 try:
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273 self._unsafeRun(job)
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274 logger.debug("[%d] Done with file." % self.wid)
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275 self.ctx.work_queue.task_done()
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276 except Exception as ex:
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277 self.ctx.abort_event.set()
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278 logger.error("[%d] Critical error, aborting." % self.wid)
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279 logger.exception(ex)
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280 break
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281
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282 def _unsafeRun(self, job):
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283 start_time = time.clock()
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284 pipeline = self.ctx.pipeline
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285 record = self.ctx.record
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286
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287 rel_path = os.path.relpath(job.path, job.base_dir)
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288 previous_entry = record.getPreviousEntry(rel_path)
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289 record_entry = ProcessorPipelineRecordEntry(job.base_dir, rel_path)
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290 record.addEntry(record_entry)
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291
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292 # Figure out if a previously processed file is overriding this one.
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293 # This can happen if a theme file (processed via a mount point)
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294 # is overridden in the user's website.
120
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295 if record.current.hasOverrideEntry(rel_path):
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296 record_entry.flags |= FLAG_OVERRIDEN
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297 logger.info(format_timed(start_time,
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298 '%s [not baked, overridden]' % rel_path))
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299 return
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300
120
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301 try:
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302 builder = ProcessingTreeBuilder(pipeline.processors)
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303 tree_root = builder.build(rel_path)
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304 except ProcessingTreeError as ex:
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305 record_entry.errors.append(str(ex))
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306 logger.error("Error processing %s: %s" % (rel_path, ex))
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307 return
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308
3
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309 print_node(tree_root, recursive=True)
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310 leaves = tree_root.getLeaves()
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311 record_entry.rel_outputs = [l.path for l in leaves]
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312
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313 force = (pipeline.force or previous_entry is None or
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314 not previous_entry.was_processed_successfully)
3
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315 if not force:
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316 force = re_matchany(rel_path, pipeline.force_patterns)
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317
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318 if force:
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319 tree_root.setState(STATE_DIRTY, True)
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320
120
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321 try:
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322 runner = ProcessingTreeRunner(
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323 job.base_dir, pipeline.tmp_dir,
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324 pipeline.out_dir, self.ctx.pipeline_lock)
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325 if runner.processSubTree(tree_root):
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326 record_entry.flags |= FLAG_PROCESSED
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327 logger.info(format_timed(start_time, "[%d] %s" % (self.wid, rel_path)))
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328 except ProcessingTreeError as ex:
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329 record_entry.errors.append(str(ex))
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330 logger.error("Error processing %s: %s" % (rel_path, ex))
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331
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332
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333 def make_re(patterns):
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334 re_patterns = []
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335 for pat in patterns:
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336 if pat[0] == '/' and pat[-1] == '/' and len(pat) > 2:
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337 re_patterns.append(pat[1:-1])
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338 else:
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339 escaped_pat = (re.escape(pat)
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340 .replace(r'\*', r'[^/\\]*')
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341 .replace(r'\?', r'[^/\\]'))
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342 re_patterns.append(escaped_pat)
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343 return [re.compile(p) for p in re_patterns]
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344
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345
35
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346 def re_matchany(filename, patterns, dirname=None):
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347 if dirname and dirname != '.':
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348 filename = os.path.join(dirname, filename)
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349
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350 # skip patterns use a forward slash regardless of the platform.
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351 filename = filename.replace('\\', '/')
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352 for pattern in patterns:
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353 if pattern.search(filename):
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354 return True
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355 return False
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356