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annotate piecrust/serving/procloop.py @ 411:e7b865f8f335

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bake: Enable multiprocess baking. Baking is now done by running a worker per CPU, and sending jobs to them. This changes several things across the codebase: * Ability to not cache things related to pages other than the 'main' page (i.e. the page at the bottom of the execution stack). * Decouple the baking process from the bake records, so only the main process keeps track (and modifies) the bake record. * Remove the need for 'batch page getters' and loading a page directly from the page factories. There are various smaller changes too included here, including support for scope performance timers that are saved with the bake record and can be printed out to the console. Yes I got carried away. For testing, the in-memory 'mock' file-system doesn't work anymore, since we're spawning processes, so this is replaced by a 'tmpfs' file-system which is saved in temporary files on disk and deleted after tests have run.
author Ludovic Chabant <ludovic@chabant.com>
date Fri, 12 Jun 2015 17:09:19 -0700
parents fa3ee8a8ee2d
children 9612cfc6455a
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1 import os
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2 import os.path
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3 import time
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4 import json
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5 import queue
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6 import logging
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7 import threading
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8
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9
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10 logger = logging.getLogger(__name__)
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12
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13 _sse_abort = threading.Event()
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16 class PipelineStatusServerSideEventProducer(object):
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17 def __init__(self, status_queue):
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18 self.status_queue = status_queue
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19 self.interval = 2
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20 self.timeout = 60*10
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21 self._start_time = 0
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22
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23 def run(self):
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24 logger.debug("Starting pipeline status SSE.")
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25 self._start_time = time.time()
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26
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27 outstr = 'event: ping\ndata: started\n\n'
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28 yield bytes(outstr, 'utf8')
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29
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30 count = 0
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31 while True:
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32 if time.time() > self.timeout + self._start_time:
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33 logger.debug("Closing pipeline status SSE, timeout reached.")
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34 outstr = 'event: pipeline_timeout\ndata: bye\n\n'
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35 yield bytes(outstr, 'utf8')
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36 break
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37
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38 if _sse_abort.is_set():
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39 break
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41 try:
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42 logger.debug("Polling pipeline status queue...")
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43 count += 1
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44 data = self.status_queue.get(True, self.interval)
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45 except queue.Empty:
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46 if count < 3:
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47 continue
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48 data = {'type': 'ping', 'message': 'ping'}
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49 count = 0
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50
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51 event_type = data['type']
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52 outstr = 'event: %s\ndata: %s\n\n' % (
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53 event_type, json.dumps(data))
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54 logger.debug("Sending pipeline status SSE.")
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55 yield bytes(outstr, 'utf8')
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56
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57 def close(self):
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58 logger.debug("Closing pipeline status SSE.")
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59
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60
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61 class ProcessingLoop(threading.Thread):
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62 def __init__(self, pipeline):
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63 super(ProcessingLoop, self).__init__(
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64 name='pipeline-reloader', daemon=True)
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65 self.pipeline = pipeline
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66 self.status_queue = queue.Queue()
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67 self.interval = 1
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68 self._paths = set()
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69 self._record = None
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70 self._last_bake = 0
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71
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72 def run(self):
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73 # Build the first list of known files and run the pipeline once.
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74 app = self.pipeline.app
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75 roots = [os.path.join(app.root_dir, r)
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76 for r in self.pipeline.mounts.keys()]
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77 for root in roots:
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78 for dirpath, dirnames, filenames in os.walk(root):
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79 self._paths |= set([os.path.join(dirpath, f)
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80 for f in filenames])
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81 self._last_bake = time.time()
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82 self._record = self.pipeline.run()
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83
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84 while True:
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85 for root in roots:
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86 # For each mount root we try to find the first new or
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87 # modified file. If any, we just run the pipeline on
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88 # that mount.
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89 found_new_or_modified = False
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90 for dirpath, dirnames, filenames in os.walk(root):
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91 for filename in filenames:
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92 path = os.path.join(dirpath, filename)
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93 if path not in self._paths:
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94 logger.debug("Found new asset: %s" % path)
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95 self._paths.add(path)
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96 found_new_or_modified = True
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97 break
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98 if os.path.getmtime(path) > self._last_bake:
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99 logger.debug("Found modified asset: %s" % path)
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100 found_new_or_modified = True
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101 break
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102
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103 if found_new_or_modified:
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104 break
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105
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106 if found_new_or_modified:
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107 self._runPipeline(root)
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108
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109 time.sleep(self.interval)
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110
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111 def _runPipeline(self, root):
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112 self._last_bake = time.time()
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113 try:
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114 self._record = self.pipeline.run(
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115 root,
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116 previous_record=self._record,
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117 save_record=False)
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118
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119 # Update the status queue.
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120 # (we need to clear it because there may not be a consumer
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121 # on the other side, if the user isn't running with the
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122 # debug window active)
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123 while True:
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124 try:
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125 self.status_queue.get_nowait()
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126 except queue.Empty:
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127 break
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128
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129 if self._record.success:
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130 item = {
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131 'type': 'pipeline_success'}
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132 self.status_queue.put_nowait(item)
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133 else:
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134 item = {
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135 'type': 'pipeline_error',
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136 'assets': []}
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137 for entry in self._record.entries:
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138 if entry.errors:
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139 asset_item = {
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140 'path': entry.rel_input,
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141 'errors': list(entry.errors)}
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142 item['assets'].append(asset_item)
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143 self.status_queue.put_nowait(item)
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144 except:
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145 pass
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146