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annotate piecrust/serving/procloop.py @ 511:1c452b7ab8b1

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docs: Make code prettier :)
author Ludovic Chabant <ludovic@chabant.com>
date Sun, 26 Jul 2015 09:53:09 -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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11
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12
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13 _sse_abort = threading.Event()
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14
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15
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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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40
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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