Mercurial > piecrust2

annotate piecrust/processing/base.py @ 117:6827dcc9d3fb

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Changes to the asset processing pipeline: * Add semi-functional RequireJS processor. * Processors now match on the relative path. * Support for processors that add more processors of their own. * A couple of related fixes.
author Ludovic Chabant <ludovic@chabant.com>
date Tue, 28 Oct 2014 08:20:38 -0700
parents 45828c4167ad
children 133845647083
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3
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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
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6 import threading
5
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7 from queue import Queue, Empty
3
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8 from piecrust.chefutil import format_timed
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9 from piecrust.processing.tree import (ProcessingTreeBuilder,
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10 ProcessingTreeRunner, STATE_DIRTY, print_node)
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11 from piecrust.records import Record
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12
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13
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14 logger = logging.getLogger(__name__)
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15
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16
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17 PRIORITY_FIRST = -1
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18 PRIORITY_NORMAL = 0
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19 PRIORITY_LAST = 1
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20
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21
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22 class Processor(object):
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23 PROCESSOR_NAME = None
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24
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25 def __init__(self):
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26 self.priority = PRIORITY_NORMAL
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27 self.is_bypassing_structured_processing = False
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28 self.is_delegating_dependency_check = True
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29
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30 def initialize(self, app):
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31 self.app = app
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32
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33 def onPipelineStart(self, pipeline):
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34 pass
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35
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36 def onPipelineEnd(self, pipeline):
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37 pass
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38
117
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39 def matches(self, path):
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40 return False
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41
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42 def getDependencies(self, path):
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43 return None
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44
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45 def getOutputFilenames(self, filename):
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46 return None
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47
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48 def process(self, path, out_dir):
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49 pass
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50
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51
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52 class CopyFileProcessor(Processor):
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53 PROCESSOR_NAME = 'copy'
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54
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55 def __init__(self):
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56 super(CopyFileProcessor, self).__init__()
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57 self.priority = PRIORITY_LAST
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58
117
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59 def matches(self, path):
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60 return True
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61
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62 def getOutputFilenames(self, filename):
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63 return [filename]
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64
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65 def process(self, path, out_dir):
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66 out_path = os.path.join(out_dir, os.path.basename(path))
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67 logger.debug("Copying: %s -> %s" % (path, out_path))
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68 shutil.copyfile(path, out_path)
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69 return True
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72 class SimpleFileProcessor(Processor):
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73 def __init__(self, extensions=None):
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74 super(SimpleFileProcessor, self).__init__()
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75 self.extensions = extensions or {}
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76
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77 def matches(self, path):
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78 for ext in self.extensions:
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79 if path.endswith('.' + ext):
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80 return True
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81 return False
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82
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83 def getOutputFilenames(self, filename):
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84 basename, ext = os.path.splitext(filename)
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85 ext = ext.lstrip('.')
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86 out_ext = self.extensions[ext]
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87 return ['%s.%s' % (basename, out_ext)]
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88
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89 def process(self, path, out_dir):
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90 _, in_name = os.path.split(path)
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91 out_name = self.getOutputFilenames(in_name)[0]
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92 out_path = os.path.join(out_dir, out_name)
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93 return self._doProcess(path, out_path)
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94
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95 def _doProcess(self, in_path, out_path):
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96 raise NotImplementedError()
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97
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98
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99 class ProcessorPipelineRecord(Record):
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100 VERSION = 1
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101
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102 def __init__(self):
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103 super(ProcessorPipelineRecord, self).__init__()
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104
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105 def addEntry(self, item):
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106 self.entries.append(item)
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107
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108 def hasOverrideEntry(self, rel_path):
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109 return self.findEntry(rel_path) is not None
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110
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111 def findEntry(self, rel_path):
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112 rel_path = rel_path.lower()
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113 for entry in self.entries:
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114 for out_path in entry.rel_outputs:
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115 if out_path.lower() == rel_path:
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116 return entry
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117 return None
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118
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119
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120 class ProcessorPipelineRecordEntry(object):
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121 def __init__(self, base_dir, rel_input, is_processed=False,
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122 is_overridden=False):
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123 self.base_dir = base_dir
3
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124 self.rel_input = rel_input
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125 self.rel_outputs = []
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126 self.is_processed = is_processed
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127 self.is_overridden = is_overridden
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128
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129 @property
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130 def path(self):
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131 return os.path.join(self.base_dir, self.rel_input)
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132
3
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133
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134 class ProcessingContext(object):
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135 def __init__(self, base_dir, job_queue, record=None):
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136 self.base_dir = base_dir
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137 self.job_queue = job_queue
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138 self.record = record
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139
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140
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141 class ProcessorPipeline(object):
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142 def __init__(self, app, mounts, out_dir, force=False,
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143 skip_patterns=None, force_patterns=None, num_workers=4):
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144 self.app = app
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145 self.mounts = mounts
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146 tmp_dir = app.cache_dir
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147 if not tmp_dir:
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148 import tempfile
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149 tmp_dir = os.path.join(tempfile.gettempdir(), 'piecrust')
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150 self.tmp_dir = os.path.join(tmp_dir, 'proc')
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151 self.out_dir = out_dir
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152 self.force = force
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153 self.skip_patterns = skip_patterns or []
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154 self.force_patterns = force_patterns or []
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155 self.processors = app.plugin_loader.getProcessors()
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156 self.num_workers = num_workers
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157
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158 self.skip_patterns += ['_cache', '_counter',
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159 'theme_info.yml',
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160 '.DS_Store', 'Thumbs.db',
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161 '.git*', '.hg*', '.svn']
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162
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163 self.skip_patterns = make_re(self.skip_patterns)
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164 self.force_patterns = make_re(self.force_patterns)
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165
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166 def filterProcessors(self, authorized_names):
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167 self.processors = list(filter(
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168 lambda p: p.PROCESSOR_NAME in authorized_names,
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169 self.processors))
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170
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171 def run(self, src_dir_or_file=None):
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172 # Invoke pre-processors.
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173 for proc in self.processors:
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174 proc.onPipelineStart(self)
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175
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176 # Sort our processors again in case the pre-process step involved
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177 # patching the processors with some new ones.
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178 self.processors.sort(key=lambda p: p.priority)
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179
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180 # Create the workers.
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181 pool = []
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182 queue = Queue()
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183 abort = threading.Event()
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184 pipeline_lock = threading.Lock()
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185 record = ProcessorPipelineRecord()
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186 for i in range(self.num_workers):
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187 ctx = ProcessingWorkerContext(self, record, queue, abort,
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188 pipeline_lock)
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189 worker = ProcessingWorker(i, ctx)
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190 worker.start()
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191 pool.append(worker)
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192
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193 if src_dir_or_file is not None:
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194 # Process only the given path.
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195 # Find out what mount point this is in.
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196 for path in self.mounts:
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197 if src_dir_or_file[:len(path)] == path:
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198 base_dir = path
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199 break
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200 else:
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201 raise Exception("Input path '%s' is not part of any known "
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202 "mount point: %s" %
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203 (src_dir_or_file, self.mounts))
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204
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205 ctx = ProcessingContext(base_dir, queue, record)
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206 logger.debug("Initiating processing pipeline on: %s" % src_dir_or_file)
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207 if os.path.isdir(src_dir_or_file):
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208 self.processDirectory(ctx, src_dir_or_file)
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209 elif os.path.isfile(src_dir_or_file):
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210 self.processFile(ctx, src_dir_or_file)
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211
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212 else:
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213 # Process everything.
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214 for path in self.mounts:
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215 ctx = ProcessingContext(path, queue, record)
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216 logger.debug("Initiating processing pipeline on: %s" % path)
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217 self.processDirectory(ctx, path)
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218
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219 # Wait on all workers.
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220 for w in pool:
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221 w.join()
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222 if abort.is_set():
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223 raise Exception("Worker pool was aborted.")
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224
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225 # Invoke post-processors.
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226 for proc in self.processors:
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227 proc.onPipelineEnd(self)
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228
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229 return record
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230
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231 def processDirectory(self, ctx, start_dir):
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232 for dirpath, dirnames, filenames in os.walk(start_dir):
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233 rel_dirpath = os.path.relpath(dirpath, start_dir)
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234 dirnames[:] = [d for d in dirnames
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diff changeset
235 if not re_matchany(d, self.skip_patterns, rel_dirpath)]
3
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236
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237 for filename in filenames:
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238 if re_matchany(filename, self.skip_patterns, rel_dirpath):
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239 continue
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240 self.processFile(ctx, os.path.join(dirpath, filename))
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241
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242 def processFile(self, ctx, path):
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243 logger.debug("Queuing: %s" % path)
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244 job = ProcessingWorkerJob(ctx.base_dir, path)
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245 ctx.job_queue.put_nowait(job)
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246
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247
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248 class ProcessingWorkerContext(object):
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249 def __init__(self, pipeline, record, work_queue, abort_event,
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250 pipeline_lock):
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251 self.pipeline = pipeline
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252 self.record = record
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253 self.work_queue = work_queue
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254 self.abort_event = abort_event
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255 self.pipeline_lock = pipeline_lock
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256
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257
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258 class ProcessingWorkerJob(object):
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259 def __init__(self, base_dir, path):
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260 self.base_dir = base_dir
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261 self.path = path
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262
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263
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264 class ProcessingWorker(threading.Thread):
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265 def __init__(self, wid, ctx):
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266 super(ProcessingWorker, self).__init__()
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267 self.wid = wid
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268 self.ctx = ctx
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269
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270 def run(self):
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271 while(not self.ctx.abort_event.is_set()):
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272 try:
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273 job = self.ctx.work_queue.get(True, 0.1)
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274 except Empty:
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275 logger.debug("[%d] No more work... shutting down." % self.wid)
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276 break
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277
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278 try:
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279 self._unsafeRun(job)
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280 logger.debug("[%d] Done with file." % self.wid)
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281 self.ctx.work_queue.task_done()
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282 except Exception as ex:
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283 self.ctx.abort_event.set()
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284 logger.error("[%d] Critical error, aborting." % self.wid)
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285 logger.exception(ex)
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286 break
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287
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288 def _unsafeRun(self, job):
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289 start_time = time.clock()
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290 pipeline = self.ctx.pipeline
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291 record = self.ctx.record
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292
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293 rel_path = os.path.relpath(job.path, job.base_dir)
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294
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295 # Figure out if a previously processed file is overriding this one.
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296 # This can happen if a theme file (processed via a mount point)
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297 # is overridden in the user's website.
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298 if record.hasOverrideEntry(rel_path):
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299 record.addEntry(ProcessorPipelineRecordEntry(
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300 job.base_dir, rel_path,
3
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301 is_processed=False, is_overridden=True))
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302 logger.info(format_timed(start_time,
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303 '%s [not baked, overridden]' % rel_path))
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304 return
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305
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306 builder = ProcessingTreeBuilder(pipeline.processors)
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307 tree_root = builder.build(rel_path)
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308 print_node(tree_root, recursive=True)
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309 leaves = tree_root.getLeaves()
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310 fi = ProcessorPipelineRecordEntry(job.base_dir, rel_path)
3
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311 fi.rel_outputs = [l.path for l in leaves]
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312 record.addEntry(fi)
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313
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314 force = pipeline.force
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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
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321 runner = ProcessingTreeRunner(job.base_dir, pipeline.tmp_dir,
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322 pipeline.out_dir, self.ctx.pipeline_lock)
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323 if runner.processSubTree(tree_root):
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324 fi.is_processed = True
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325 logger.info(format_timed(start_time, "[%d] %s" % (self.wid, rel_path)))
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326
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327
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328 def make_re(patterns):
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329 re_patterns = []
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330 for pat in patterns:
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331 if pat[0] == '/' and pat[-1] == '/' and len(pat) > 2:
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332 re_patterns.append(pat[1:-1])
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333 else:
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334 escaped_pat = (re.escape(pat)
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335 .replace(r'\*', r'[^/\\]*')
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336 .replace(r'\?', r'[^/\\]'))
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337 re_patterns.append(escaped_pat)
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338 return [re.compile(p) for p in re_patterns]
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339
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340
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341 def re_matchany(filename, patterns, dirname=None):
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342 if dirname and dirname != '.':
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343 filename = os.path.join(dirname, filename)
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344
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345 # skip patterns use a forward slash regardless of the platform.
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346 filename = filename.replace('\\', '/')
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347 for pattern in patterns:
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348 if pattern.search(filename):
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349 return True
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350 return False
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351