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annotate piecrust/serving/procloop.py @ 565:ff714d7f074d

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serve: Fix error reporting when the background pipeline fails.
author Ludovic Chabant <ludovic@chabant.com>
date Fri, 09 Oct 2015 16:49:12 -0700
parents cc6f3dbe3048
children 7dabfdd056a1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 itertools
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8 import threading
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9 from piecrust.app import PieCrust
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10 from piecrust.processing.pipeline import ProcessorPipeline
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13 logger = logging.getLogger(__name__)
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14
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15 # This flag is for cancelling all long running requests like SSEs.
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16 server_shutdown = False
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18
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19 class PipelineStatusServerSentEventProducer(object):
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20 """ The producer for Server-Sent Events (SSE) notifying the front-end
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21 about useful things like assets having been re-processed in the
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22 background.
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23 Each has its own queue because the user could have multiple pages
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24 open, each having to display notifications coming from the server.
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25 """
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26 def __init__(self, proc_loop):
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27 self._proc_loop = proc_loop
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28 self._queue = queue.Queue()
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29 self._start_time = 0
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30 self._poll_interval = 0.5
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31 self._ping_interval = 30
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32 self._time_between_pings = 0
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33 self._running = 0
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34
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35 def addBuildEvent(self, item):
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36 self._queue.put_nowait(item)
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37
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38 def run(self):
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39 logger.debug("Starting pipeline status SSE.")
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40 self._proc_loop.addObserver(self)
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41 self._start_time = time.time()
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42 self._running = 1
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43
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44 outstr = 'event: ping\ndata: started\n\n'
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45 yield bytes(outstr, 'utf8')
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46
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47 while self._running == 1 and not server_shutdown:
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48 try:
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49 # We use a short poll interval (less than a second) because
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50 # we need to catch `server_shutdown` going `True` as soon as
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51 # possible to exit this thread when the user hits `CTRL+C`.
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52 data = self._queue.get(True, self._poll_interval)
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53 except queue.Empty:
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54 # Not exact timing but close enough.
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55 self._time_between_pings += self._poll_interval
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56 if self._time_between_pings >= self._ping_interval:
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57 self._time_between_pings = 0
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58 logger.debug("Sending ping/heartbeat event.")
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59 outstr = 'event: ping\ndata: 1\n\n'
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60 yield bytes(outstr, 'utf8')
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61 continue
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62
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63 logger.debug("Sending pipeline status SSE.")
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64 outstr = (('event: %s\n' % data['type']) +
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65 ('id: %s\n' % data['id']) +
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66 ('data: %s\n\n' % json.dumps(data)))
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67 self._queue.task_done()
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68 yield bytes(outstr, 'utf8')
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69
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70 def close(self):
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71 logger.debug("Closing pipeline status SSE.")
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72 self._proc_loop.removeObserver(self)
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73 self._running = 2
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74
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75
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76 class ProcessingLoop(threading.Thread):
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77 def __init__(self, root_dir, out_dir, sub_cache_dir=None, debug=False):
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78 super(ProcessingLoop, self).__init__(
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79 name='pipeline-reloader', daemon=True)
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80 # TODO: re-create the app when `config.yml` is changed.
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81 self.app = PieCrust(root_dir=root_dir, debug=debug)
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82 if sub_cache_dir:
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83 self.app._useSubCacheDir(sub_cache_dir)
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84 self.pipeline = ProcessorPipeline(self.app, out_dir)
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85 self.last_status_id = 0
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86 self.interval = 1
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87 self._paths = set()
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88 self._record = None
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89 self._last_bake = 0
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90 self._obs = []
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91 self._obs_lock = threading.Lock()
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92
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93 def addObserver(self, obs):
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94 with self._obs_lock:
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95 self._obs.append(obs)
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96
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97 def removeObserver(self, obs):
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98 with self._obs_lock:
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99 self._obs.remove(obs)
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100
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101 def run(self):
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102 # Build the first list of known files and run the pipeline once.
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103 roots = [os.path.join(self.app.root_dir, r)
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104 for r in self.pipeline.mounts.keys()]
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105 for root in roots:
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106 for dirpath, dirnames, filenames in os.walk(root):
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107 self._paths |= set([os.path.join(dirpath, f)
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108 for f in filenames])
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109 self._last_bake = time.time()
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110 self._record = self.pipeline.run()
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111
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112 while True:
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113 for root in roots:
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114 # For each mount root we try to find the first new or
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115 # modified file. If any, we just run the pipeline on
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116 # that mount.
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117 found_new_or_modified = False
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118 for dirpath, dirnames, filenames in os.walk(root):
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119 for filename in filenames:
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120 path = os.path.join(dirpath, filename)
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121 if path not in self._paths:
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122 logger.debug("Found new asset: %s" % path)
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123 self._paths.add(path)
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124 found_new_or_modified = True
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125 break
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126 if os.path.getmtime(path) > self._last_bake:
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127 logger.debug("Found modified asset: %s" % path)
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128 found_new_or_modified = True
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129 break
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130
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131 if found_new_or_modified:
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132 break
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133
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134 if found_new_or_modified:
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135 self._runPipeline(root)
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136
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137 time.sleep(self.interval)
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138
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139 def _runPipeline(self, root):
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140 self._last_bake = time.time()
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141 try:
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142 self._record = self.pipeline.run(
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143 root,
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144 previous_record=self._record,
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145 save_record=False)
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146
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147 status_id = self.last_status_id + 1
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148 self.last_status_id += 1
374
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149
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150 if self._record.success:
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151 changed = filter(
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152 lambda i: not i.was_collapsed_from_last_run,
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153 self._record.entries)
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154 changed = itertools.chain.from_iterable(
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155 map(lambda i: i.rel_outputs, changed))
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156 changed = list(changed)
374
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157 item = {
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158 'id': status_id,
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159 'type': 'pipeline_success',
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160 'assets': changed}
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161
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162 self._notifyObservers(item)
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163 else:
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164 item = {
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165 'id': status_id,
374
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166 'type': 'pipeline_error',
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167 'assets': []}
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168 for entry in self._record.entries:
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169 if entry.errors:
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170 asset_item = {
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171 'path': entry.path,
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172 'errors': list(entry.errors)}
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173 item['assets'].append(asset_item)
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174
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175 self._notifyObservers(item)
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176 except Exception as ex:
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177 logger.exception(ex)
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178
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179 def _notifyObservers(self, item):
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180 with self._obs_lock:
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181 observers = list(self._obs)
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182 for obs in observers:
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183 obs.addBuildEvent(item)
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184