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annotate lib/patchablegraph/patchsource.py @ 569:2d13254fdd44
fix old module name twisted_sse_demo
Ignore-this: 9eae98ea57725eeaf68e94e9f9f46fec
| author | drewp@bigasterisk.com |
|---|---|
| date | Mon, 06 May 2019 00:02:26 -0700 |
| parents | 495f573af4f4 |
| children | 32939cddf360 |
| rev | line source |
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| 514 | 1 import logging |
| 302 | 2 import traceback |
| 3 from rdflib import ConjunctiveGraph | |
| 4 from rdflib.parser import StringInputSource | |
| 514 | 5 from twisted.internet import reactor, defer |
| 302 | 6 |
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7 from rdfdb.patch import Patch |
| 569 | 8 from twisted_sse.eventsource import EventSource |
| 9 | |
| 10 from .patchablegraph import patchFromJson | |
| 302 | 11 |
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12 log = logging.getLogger('fetch') |
| 302 | 13 |
| 14 class PatchSource(object): | |
| 15 """wrap EventSource so it emits Patch objects and has an explicit stop method.""" | |
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16 def __init__(self, url, agent): |
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17 self.url = str(url) |
| 302 | 18 |
| 19 # add callbacks to these to learn if we failed to connect | |
| 20 # (approximately) or if the ccnnection was unexpectedly lost | |
| 21 self.connectionFailed = defer.Deferred() | |
| 22 self.connectionLost = defer.Deferred() | |
| 23 | |
| 24 self._listeners = set() | |
| 25 log.info('start read from %s', url) | |
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26 # note: fullGraphReceived isn't guaranteed- the stream could |
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27 # start with patches |
| 302 | 28 self._fullGraphReceived = False |
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29 self._eventSource = EventSource(url.toPython().encode('utf8'), |
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30 userAgent=agent) |
| 302 | 31 |
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32 self._eventSource.addEventListener(b'fullGraph', self._onFullGraph) |
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33 self._eventSource.addEventListener(b'patch', self._onPatch) |
| 302 | 34 self._eventSource.onerror(self._onError) |
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35 self._eventSource.onConnectionLost = self._onDisconnect |
| 306 | 36 |
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37 def state(self): |
| 306 | 38 return { |
| 39 'url': self.url, | |
| 40 'fullGraphReceived': self._fullGraphReceived, | |
| 41 } | |
| 302 | 42 |
| 43 def addPatchListener(self, func): | |
| 44 """ | |
| 45 func(patch, fullGraph=[true if the patch is the initial fullgraph]) | |
| 46 """ | |
| 47 self._listeners.add(func) | |
| 48 | |
| 49 def stop(self): | |
| 50 log.info('stop read from %s', self.url) | |
| 51 try: | |
| 52 self._eventSource.protocol.stopProducing() # needed? | |
| 53 except AttributeError: | |
| 54 pass | |
| 55 self._eventSource = None | |
| 56 | |
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57 def _onDisconnect(self, reason): |
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58 log.debug('PatchSource._onDisconnect from %s (%s)', self.url, reason) |
| 302 | 59 # skip this if we're doing a stop? |
| 60 self.connectionLost.callback(None) | |
| 61 | |
| 62 def _onError(self, msg): | |
| 63 log.debug('PatchSource._onError from %s %r', self.url, msg) | |
| 64 if not self._fullGraphReceived: | |
| 65 self.connectionFailed.callback(msg) | |
| 66 else: | |
| 67 self.connectionLost.callback(msg) | |
| 68 | |
| 69 def _onFullGraph(self, message): | |
| 70 try: | |
| 71 g = ConjunctiveGraph() | |
| 72 g.parse(StringInputSource(message), format='json-ld') | |
| 73 p = Patch(addGraph=g) | |
| 74 self._sendPatch(p, fullGraph=True) | |
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75 except Exception: |
| 302 | 76 log.error(traceback.format_exc()) |
| 77 raise | |
| 78 self._fullGraphReceived = True | |
| 79 | |
| 80 def _onPatch(self, message): | |
| 81 try: | |
| 82 p = patchFromJson(message) | |
| 83 self._sendPatch(p, fullGraph=False) | |
| 84 except: | |
| 85 log.error(traceback.format_exc()) | |
| 86 raise | |
| 87 | |
| 88 def _sendPatch(self, p, fullGraph): | |
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89 log.debug('PatchSource %s received patch %s (fullGraph=%s)', |
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90 self.url, p.shortSummary(), fullGraph) |
| 302 | 91 for lis in self._listeners: |
| 92 lis(p, fullGraph=fullGraph) | |
| 93 | |
| 94 def __del__(self): | |
| 95 if self._eventSource: | |
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96 raise ValueError("PatchSource wasn't stopped before del") |
| 302 | 97 |
| 98 class ReconnectingPatchSource(object): | |
| 99 """ | |
| 100 PatchSource api, but auto-reconnects internally and takes listener | |
| 101 at init time to not miss any patches. You'll get another | |
| 102 fullGraph=True patch if we have to reconnect. | |
| 103 | |
| 104 todo: generate connection stmts in here | |
| 105 """ | |
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106 def __init__(self, url, listener, reconnectSecs=60, agent='unset'): |
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107 # type: (str, Any, Any, str) |
| 302 | 108 self.url = url |
| 109 self._stopped = False | |
| 110 self._listener = listener | |
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111 self.reconnectSecs = reconnectSecs |
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112 self.agent = agent |
| 302 | 113 self._reconnect() |
| 114 | |
| 115 def _reconnect(self): | |
| 116 if self._stopped: | |
| 117 return | |
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118 self._ps = PatchSource(self.url, agent=self.agent) |
| 302 | 119 self._ps.addPatchListener(self._onPatch) |
| 120 self._ps.connectionFailed.addCallback(self._onConnectionFailed) | |
| 121 self._ps.connectionLost.addCallback(self._onConnectionLost) | |
| 122 | |
| 123 def _onPatch(self, p, fullGraph): | |
| 124 self._listener(p, fullGraph=fullGraph) | |
| 306 | 125 |
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126 def state(self): |
| 306 | 127 return { |
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128 'reconnectedPatchSource': self._ps.state(), |
| 306 | 129 } |
| 302 | 130 |
| 131 def stop(self): | |
| 132 self._stopped = True | |
| 133 self._ps.stop() | |
| 134 | |
| 135 def _onConnectionFailed(self, arg): | |
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136 reactor.callLater(self.reconnectSecs, self._reconnect) |
| 302 | 137 |
| 138 def _onConnectionLost(self, arg): | |
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139 reactor.callLater(self.reconnectSecs, self._reconnect) |
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140 |