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annotate lib/patchablegraph/patchsource.py @ 746:099b7e7aad44
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Ignore-this: 29c0f7dcd203e73e7569c796686f8802
| author | drewp@bigasterisk.com |
|---|---|
| date | Thu, 13 Feb 2020 10:19:46 -0800 |
| parents | 32939cddf360 |
| children |
| rev | line source |
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| 592 | 1 import logging, time |
| 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) | |
| 592 | 26 self._startReadTime = time.time() |
| 27 self._patchesReceived = 0 # including fullgraph | |
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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, | |
| 592 | 43 'patchesReceived': self._patchesReceived, |
| 44 'time': { | |
| 45 'open': getattr(self, '_startReadTime', None), | |
| 46 'fullGraph': getattr(self, '_fullGraphTime', None), | |
| 47 'latestPatch': getattr(self, '_latestPatchTime', None), | |
| 48 }, | |
| 49 'closed': self._eventSource is None, | |
| 306 | 50 } |
| 302 | 51 |
| 52 def addPatchListener(self, func): | |
| 53 """ | |
| 54 func(patch, fullGraph=[true if the patch is the initial fullgraph]) | |
| 55 """ | |
| 56 self._listeners.add(func) | |
| 57 | |
| 58 def stop(self): | |
| 59 log.info('stop read from %s', self.url) | |
| 60 try: | |
| 61 self._eventSource.protocol.stopProducing() # needed? | |
| 62 except AttributeError: | |
| 63 pass | |
| 64 self._eventSource = None | |
| 65 | |
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66 def _onDisconnect(self, reason): |
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67 log.debug('PatchSource._onDisconnect from %s (%s)', self.url, reason) |
| 302 | 68 # skip this if we're doing a stop? |
| 69 self.connectionLost.callback(None) | |
| 70 | |
| 71 def _onError(self, msg): | |
| 72 log.debug('PatchSource._onError from %s %r', self.url, msg) | |
| 73 if not self._fullGraphReceived: | |
| 74 self.connectionFailed.callback(msg) | |
| 75 else: | |
| 76 self.connectionLost.callback(msg) | |
| 77 | |
| 78 def _onFullGraph(self, message): | |
| 79 try: | |
| 80 g = ConjunctiveGraph() | |
| 81 g.parse(StringInputSource(message), format='json-ld') | |
| 82 p = Patch(addGraph=g) | |
| 83 self._sendPatch(p, fullGraph=True) | |
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84 except Exception: |
| 302 | 85 log.error(traceback.format_exc()) |
| 86 raise | |
| 87 self._fullGraphReceived = True | |
| 592 | 88 self._fullGraphTime = time.time() |
| 89 self._patchesReceived += 1 | |
| 302 | 90 |
| 91 def _onPatch(self, message): | |
| 92 try: | |
| 93 p = patchFromJson(message) | |
| 94 self._sendPatch(p, fullGraph=False) | |
| 95 except: | |
| 96 log.error(traceback.format_exc()) | |
| 97 raise | |
| 592 | 98 self._latestPatchTime = time.time() |
| 99 self._patchesReceived += 1 | |
| 302 | 100 |
| 101 def _sendPatch(self, p, fullGraph): | |
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102 log.debug('PatchSource %s received patch %s (fullGraph=%s)', |
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103 self.url, p.shortSummary(), fullGraph) |
| 302 | 104 for lis in self._listeners: |
| 105 lis(p, fullGraph=fullGraph) | |
| 106 | |
| 107 def __del__(self): | |
| 108 if self._eventSource: | |
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109 raise ValueError("PatchSource wasn't stopped before del") |
| 302 | 110 |
| 111 class ReconnectingPatchSource(object): | |
| 112 """ | |
| 113 PatchSource api, but auto-reconnects internally and takes listener | |
| 114 at init time to not miss any patches. You'll get another | |
| 115 fullGraph=True patch if we have to reconnect. | |
| 116 | |
| 117 todo: generate connection stmts in here | |
| 118 """ | |
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119 def __init__(self, url, listener, reconnectSecs=60, agent='unset'): |
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120 # type: (str, Any, Any, str) |
| 302 | 121 self.url = url |
| 122 self._stopped = False | |
| 123 self._listener = listener | |
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124 self.reconnectSecs = reconnectSecs |
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125 self.agent = agent |
| 302 | 126 self._reconnect() |
| 127 | |
| 128 def _reconnect(self): | |
| 129 if self._stopped: | |
| 130 return | |
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131 self._ps = PatchSource(self.url, agent=self.agent) |
| 302 | 132 self._ps.addPatchListener(self._onPatch) |
| 133 self._ps.connectionFailed.addCallback(self._onConnectionFailed) | |
| 134 self._ps.connectionLost.addCallback(self._onConnectionLost) | |
| 135 | |
| 136 def _onPatch(self, p, fullGraph): | |
| 137 self._listener(p, fullGraph=fullGraph) | |
| 306 | 138 |
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139 def state(self): |
| 306 | 140 return { |
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141 'reconnectedPatchSource': self._ps.state(), |
| 306 | 142 } |
| 302 | 143 |
| 144 def stop(self): | |
| 145 self._stopped = True | |
| 146 self._ps.stop() | |
| 147 | |
| 148 def _onConnectionFailed(self, arg): | |
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149 reactor.callLater(self.reconnectSecs, self._reconnect) |
| 302 | 150 |
| 151 def _onConnectionLost(self, arg): | |
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152 reactor.callLater(self.reconnectSecs, self._reconnect) |
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153 |