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annotate lib/patchsource.py @ 1229:02e4b84821d5

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talk to store graph, second button for holding unlocked, etc Ignore-this: c2ae7d756e743c26e5e01d99772899bd darcs-hash:a0750d0bbc4dc7c0f65f63f3e7342b35a175141b
author drewp <drewp@bigasterisk.com>
date Thu, 04 Apr 2019 02:16:22 -0700
parents ee168d55524a
children b50a13ef20ba
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1156
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1 import sys, logging
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2 import traceback
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3 from twisted.internet import reactor, defer
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4 from twisted_sse_demo.eventsource import EventSource
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5 from rdflib import ConjunctiveGraph
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6 from rdflib.parser import StringInputSource
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7
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8 sys.path.append("../../lib")
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9 from patchablegraph import patchFromJson
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10
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11 sys.path.append("/my/proj/rdfdb")
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12 from rdfdb.patch import Patch
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13
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14 log = logging.getLogger('fetch')
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15
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16 class PatchSource(object):
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17 """wrap EventSource so it emits Patch objects and has an explicit stop method."""
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18 def __init__(self, url):
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19 self.url = url
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20
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21 # add callbacks to these to learn if we failed to connect
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22 # (approximately) or if the ccnnection was unexpectedly lost
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23 self.connectionFailed = defer.Deferred()
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24 self.connectionLost = defer.Deferred()
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25
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26 self._listeners = set()
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27 log.info('start read from %s', url)
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28 # note: fullGraphReceived isn't guaranteed- the stream could
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29 # start with patches
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30 self._fullGraphReceived = False
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31 self._eventSource = EventSource(url.toPython().encode('utf8'))
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32 self._eventSource.protocol.delimiter = '\n'
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33
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34 self._eventSource.addEventListener('fullGraph', self._onFullGraph)
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35 self._eventSource.addEventListener('patch', self._onPatch)
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36 self._eventSource.onerror(self._onError)
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37
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38 origSet = self._eventSource.protocol.setFinishedDeferred
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39 def sfd(d):
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40 origSet(d)
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41 d.addCallback(self._onDisconnect)
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42 self._eventSource.protocol.setFinishedDeferred = sfd
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43
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44 def stats(self):
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45 return {
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46 'url': self.url,
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47 'fullGraphReceived': self._fullGraphReceived,
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48 }
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49
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50 def addPatchListener(self, func):
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51 """
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52 func(patch, fullGraph=[true if the patch is the initial fullgraph])
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53 """
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54 self._listeners.add(func)
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55
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56 def stop(self):
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57 log.info('stop read from %s', self.url)
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58 try:
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59 self._eventSource.protocol.stopProducing() # needed?
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60 except AttributeError:
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61 pass
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62 self._eventSource = None
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63
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64 def _onDisconnect(self, a):
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65 log.debug('PatchSource._onDisconnect from %s', self.url)
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66 # skip this if we're doing a stop?
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67 self.connectionLost.callback(None)
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68
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69 def _onError(self, msg):
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70 log.debug('PatchSource._onError from %s %r', self.url, msg)
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71 if not self._fullGraphReceived:
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72 self.connectionFailed.callback(msg)
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73 else:
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74 self.connectionLost.callback(msg)
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75
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76 def _onFullGraph(self, message):
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77 try:
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78 g = ConjunctiveGraph()
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79 g.parse(StringInputSource(message), format='json-ld')
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80 p = Patch(addGraph=g)
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81 self._sendPatch(p, fullGraph=True)
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82 except:
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83 log.error(traceback.format_exc())
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84 raise
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85 self._fullGraphReceived = True
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86
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87 def _onPatch(self, message):
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88 try:
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89 p = patchFromJson(message)
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90 self._sendPatch(p, fullGraph=False)
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91 except:
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92 log.error(traceback.format_exc())
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93 raise
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94
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95 def _sendPatch(self, p, fullGraph):
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96 log.debug('PatchSource %s received patch %s (fullGraph=%s)', self.url, p.shortSummary(), fullGraph)
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97 for lis in self._listeners:
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98 lis(p, fullGraph=fullGraph)
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99
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100 def __del__(self):
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101 if self._eventSource:
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102 raise ValueError
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103
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104 class ReconnectingPatchSource(object):
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105 """
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106 PatchSource api, but auto-reconnects internally and takes listener
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107 at init time to not miss any patches. You'll get another
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108 fullGraph=True patch if we have to reconnect.
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109
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110 todo: generate connection stmts in here
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111 """
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112 def __init__(self, url, listener):
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113 self.url = url
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114 self._stopped = False
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115 self._listener = listener
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116 self._reconnect()
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117
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118 def _reconnect(self):
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119 if self._stopped:
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120 return
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121 self._ps = PatchSource(self.url)
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122 self._ps.addPatchListener(self._onPatch)
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123 self._ps.connectionFailed.addCallback(self._onConnectionFailed)
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124 self._ps.connectionLost.addCallback(self._onConnectionLost)
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125
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126 def _onPatch(self, p, fullGraph):
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127 self._listener(p, fullGraph=fullGraph)
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128
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129 def stats(self):
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130 return {
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131 'reconnectedPatchSource': self._ps.stats(),
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132 }
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133
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134 def stop(self):
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135 self._stopped = True
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136 self._ps.stop()
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137
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138 def _onConnectionFailed(self, arg):
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139 reactor.callLater(60, self._reconnect)
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140
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141 def _onConnectionLost(self, arg):
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142 reactor.callLater(60, self._reconnect)
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143