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annotate lib/patchsource.py @ 483:a8823c7aab58
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Ignore-this: 182c5bf72e51479c94f03e4bb8deeb2a
| author | drewp@bigasterisk.com |
|---|---|
| date | Sun, 21 Apr 2019 00:04:32 -0700 |
| parents | b5abd4fc65a4 |
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| rev | line source |
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1 import sys, logging |
| 302 | 2 import traceback |
| 3 from twisted.internet import reactor, defer | |
| 4 from twisted_sse_demo.eventsource import EventSource | |
| 5 from rdflib import ConjunctiveGraph | |
| 6 from rdflib.parser import StringInputSource | |
| 7 | |
| 8 sys.path.append("../../lib") | |
| 9 from patchablegraph import patchFromJson | |
| 10 | |
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11 sys.path.append("/my/proj/rdfdb") |
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12 from rdfdb.patch import Patch |
| 302 | 13 |
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14 log = logging.getLogger('fetch') |
| 302 | 15 |
| 16 class PatchSource(object): | |
| 17 """wrap EventSource so it emits Patch objects and has an explicit stop method.""" | |
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18 def __init__(self, url, agent): |
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19 self.url = str(url) |
| 302 | 20 |
| 21 # add callbacks to these to learn if we failed to connect | |
| 22 # (approximately) or if the ccnnection was unexpectedly lost | |
| 23 self.connectionFailed = defer.Deferred() | |
| 24 self.connectionLost = defer.Deferred() | |
| 25 | |
| 26 self._listeners = set() | |
| 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 |
| 302 | 30 self._fullGraphReceived = False |
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31 self._eventSource = EventSource(url.toPython().encode('utf8'), |
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32 userAgent=agent) |
| 302 | 33 |
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34 self._eventSource.addEventListener(b'fullGraph', self._onFullGraph) |
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35 self._eventSource.addEventListener(b'patch', self._onPatch) |
| 302 | 36 self._eventSource.onerror(self._onError) |
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37 self._eventSource.onConnectionLost = self._onDisconnect |
| 306 | 38 |
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39 def state(self): |
| 306 | 40 return { |
| 41 'url': self.url, | |
| 42 'fullGraphReceived': self._fullGraphReceived, | |
| 43 } | |
| 302 | 44 |
| 45 def addPatchListener(self, func): | |
| 46 """ | |
| 47 func(patch, fullGraph=[true if the patch is the initial fullgraph]) | |
| 48 """ | |
| 49 self._listeners.add(func) | |
| 50 | |
| 51 def stop(self): | |
| 52 log.info('stop read from %s', self.url) | |
| 53 try: | |
| 54 self._eventSource.protocol.stopProducing() # needed? | |
| 55 except AttributeError: | |
| 56 pass | |
| 57 self._eventSource = None | |
| 58 | |
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59 def _onDisconnect(self, reason): |
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60 log.debug('PatchSource._onDisconnect from %s (%s)', self.url, reason) |
| 302 | 61 # skip this if we're doing a stop? |
| 62 self.connectionLost.callback(None) | |
| 63 | |
| 64 def _onError(self, msg): | |
| 65 log.debug('PatchSource._onError from %s %r', self.url, msg) | |
| 66 if not self._fullGraphReceived: | |
| 67 self.connectionFailed.callback(msg) | |
| 68 else: | |
| 69 self.connectionLost.callback(msg) | |
| 70 | |
| 71 def _onFullGraph(self, message): | |
| 72 try: | |
| 73 g = ConjunctiveGraph() | |
| 74 g.parse(StringInputSource(message), format='json-ld') | |
| 75 p = Patch(addGraph=g) | |
| 76 self._sendPatch(p, fullGraph=True) | |
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77 except Exception: |
| 302 | 78 log.error(traceback.format_exc()) |
| 79 raise | |
| 80 self._fullGraphReceived = True | |
| 81 | |
| 82 def _onPatch(self, message): | |
| 83 try: | |
| 84 p = patchFromJson(message) | |
| 85 self._sendPatch(p, fullGraph=False) | |
| 86 except: | |
| 87 log.error(traceback.format_exc()) | |
| 88 raise | |
| 89 | |
| 90 def _sendPatch(self, p, fullGraph): | |
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91 log.debug('PatchSource %s received patch %s (fullGraph=%s)', |
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92 self.url, p.shortSummary(), fullGraph) |
| 302 | 93 for lis in self._listeners: |
| 94 lis(p, fullGraph=fullGraph) | |
| 95 | |
| 96 def __del__(self): | |
| 97 if self._eventSource: | |
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98 raise ValueError("PatchSource wasn't stopped before del") |
| 302 | 99 |
| 100 class ReconnectingPatchSource(object): | |
| 101 """ | |
| 102 PatchSource api, but auto-reconnects internally and takes listener | |
| 103 at init time to not miss any patches. You'll get another | |
| 104 fullGraph=True patch if we have to reconnect. | |
| 105 | |
| 106 todo: generate connection stmts in here | |
| 107 """ | |
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108 def __init__(self, url, listener, reconnectSecs=60, agent='unset'): |
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109 # type: (str, Any, Any, str) |
| 302 | 110 self.url = url |
| 111 self._stopped = False | |
| 112 self._listener = listener | |
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113 self.reconnectSecs = reconnectSecs |
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114 self.agent = agent |
| 302 | 115 self._reconnect() |
| 116 | |
| 117 def _reconnect(self): | |
| 118 if self._stopped: | |
| 119 return | |
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120 self._ps = PatchSource(self.url, agent=self.agent) |
| 302 | 121 self._ps.addPatchListener(self._onPatch) |
| 122 self._ps.connectionFailed.addCallback(self._onConnectionFailed) | |
| 123 self._ps.connectionLost.addCallback(self._onConnectionLost) | |
| 124 | |
| 125 def _onPatch(self, p, fullGraph): | |
| 126 self._listener(p, fullGraph=fullGraph) | |
| 306 | 127 |
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128 def state(self): |
| 306 | 129 return { |
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130 'reconnectedPatchSource': self._ps.state(), |
| 306 | 131 } |
| 302 | 132 |
| 133 def stop(self): | |
| 134 self._stopped = True | |
| 135 self._ps.stop() | |
| 136 | |
| 137 def _onConnectionFailed(self, arg): | |
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138 reactor.callLater(self.reconnectSecs, self._reconnect) |
| 302 | 139 |
| 140 def _onConnectionLost(self, arg): | |
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141 reactor.callLater(self.reconnectSecs, self._reconnect) |
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142 |