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annotate service/reasoning/inputgraph.py @ 1721:e30741ab51a7
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| author | drewp@bigasterisk.com |
|---|---|
| date | Fri, 16 Jun 2023 17:23:54 -0700 |
| parents | c8562ace4917 |
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| rev | line source |
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1 import logging |
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2 import time |
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3 import weakref |
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4 from typing import Callable |
| 275 | 5 |
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6 from patchablegraph.patchsource import ReconnectingPatchSource |
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7 from prometheus_client import Summary |
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8 from rdfdb.patch import Patch |
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9 from rdfdb.rdflibpatch import patchQuads |
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10 from rdflib import RDFS, ConjunctiveGraph, Graph, Namespace, URIRef |
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11 from rdflib.parser import StringInputSource |
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12 from rx.subjects import BehaviorSubject |
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13 from twisted.internet import reactor |
| 275 | 14 from twisted.python.filepath import FilePath |
| 303 | 15 |
| 275 | 16 log = logging.getLogger('fetch') |
| 17 | |
| 18 ROOM = Namespace("http://projects.bigasterisk.com/room/") | |
| 19 DEV = Namespace("http://projects.bigasterisk.com/device/") | |
| 20 | |
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21 COMBINE_GRAPH_CALLS = Summary('combine_graph_calls', 'calls') |
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22 |
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23 |
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24 def parseRdf(text: str, contentType: str): |
| 281 | 25 g = Graph() |
| 26 g.parse(StringInputSource(text), format={ | |
| 27 'text/n3': 'n3', | |
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28 }[contentType]) |
| 281 | 29 return g |
| 30 | |
| 31 | |
| 303 | 32 class RemoteData(object): |
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33 |
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34 def __init__(self, onChange: Callable[[], None]): |
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35 """we won't fire onChange during init""" |
| 303 | 36 self.onChange = onChange |
| 37 self.graph = ConjunctiveGraph() | |
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38 reactor.callLater(0, self._finishInit) |
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39 |
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40 def _finishInit(self): |
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41 self.patchSource = ReconnectingPatchSource( |
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42 URIRef('http://collector.default.svc.cluster.local:9072/graph/home'), |
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43 # URIRef('http://frontdoor:10012/graph/events'), |
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44 self.onPatch, |
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45 reconnectSecs=10, |
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46 agent='reasoning') |
| 303 | 47 |
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48 def onPatch(self, p: Patch, fullGraph: bool): |
| 303 | 49 if fullGraph: |
| 50 self.graph = ConjunctiveGraph() | |
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51 patchQuads(self.graph, deleteQuads=p.delQuads, addQuads=p.addQuads, perfect=True) |
| 303 | 52 |
| 53 ignorePredicates = [ | |
| 54 ROOM['signalStrength'], | |
| 55 # perhaps anything with a number-datatype for its | |
| 56 # object should be filtered out, and you have to make | |
| 57 # an upstream quantization (e.g. 'temp high'/'temp | |
| 58 # low') if you want to do reasoning on the difference | |
| 59 URIRef("http://bigasterisk.com/map#lastSeenAgoSec"), | |
| 60 URIRef("http://bigasterisk.com/map#lastSeenAgo"), | |
| 61 ROOM['usingPower'], | |
| 62 ROOM['idleTimeMinutes'], | |
| 63 ROOM['idleTimeMs'], | |
| 64 ROOM['graphLoadMs'], | |
| 65 ROOM['localTimeToSecond'], | |
| 66 ROOM['history'], | |
| 67 ROOM['connectedAgo'], | |
| 68 RDFS['comment'], | |
| 69 ] | |
| 70 ignoreContexts = [ | |
| 71 URIRef('http://bigasterisk.com/sse_collector/'), | |
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72 ] |
| 303 | 73 for affected in p.addQuads + p.delQuads: |
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74 if (affected[1] not in ignorePredicates and affected[3] not in ignoreContexts): |
| 303 | 75 log.debug(" remote graph changed") |
| 76 self.onChange() | |
| 77 break | |
| 78 else: | |
| 79 log.debug(" remote graph has no changes to trigger rules") | |
| 80 | |
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81 |
| 275 | 82 class InputGraph(object): |
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83 |
| 303 | 84 def __init__(self, inputDirs, onChange): |
| 275 | 85 """ |
| 86 this has one Graph that's made of: | |
| 87 - all .n3 files from inputDirs (read at startup) | |
| 88 - all the remote graphs, specified in the file graphs | |
| 89 | |
| 90 call updateFileData or updateRemoteData to reread those | |
| 91 graphs. getGraph to access the combined graph. | |
| 92 | |
| 93 onChange(self) is called if the contents of the full graph | |
| 94 change (in an interesting way) during updateFileData or | |
| 95 updateRemoteData. Interesting means statements other than the | |
| 96 ones with the predicates on the boring list. onChange(self, | |
| 97 oneShot=True) means: don't store the result of this change | |
| 98 anywhere; it needs to be processed only once | |
| 99 """ | |
| 100 self.inputDirs = inputDirs | |
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101 self._onChange = onChange |
| 275 | 102 self._fileGraph = Graph() |
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103 self._remoteData = RemoteData(lambda: self.onChangeLocal()) |
| 275 | 104 self._combinedGraph = None |
| 105 self._oneShotAdditionGraph = None | |
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106 self._rxValues = weakref.WeakKeyDictionary() |
| 275 | 107 |
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108 def onChangeLocal(self, oneShot=False, oneShotGraph=None): |
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109 self._combinedGraph = None |
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110 self._onChange(self, oneShot=oneShot, oneShotGraph=oneShotGraph) |
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111 for rxv, (subj, pred, default) in self._rxValues.items(): |
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112 self._rxUpdate(subj, pred, default, rxv) |
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113 |
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114 def _rxUpdate(self, subj, pred, default, rxv): |
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115 rxv.on_next(self.getGraph().value(subj, pred, default=default)) |
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116 |
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117 def rxValue(self, subj, pred, default): # -> BehaviorSubject: |
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118 value = BehaviorSubject(default) |
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119 self._rxValues[value] = (subj, pred, default) |
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120 self._rxUpdate(subj, pred, default, value) |
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121 return value |
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122 |
| 275 | 123 def updateFileData(self): |
| 124 """ | |
| 125 make sure we contain the correct data from the files in inputDirs | |
| 126 """ | |
| 127 # this sample one is actually only needed for the output, but I don't | |
| 128 # think I want to have a separate graph for the output | |
| 129 # handling | |
| 130 log.debug("read file graphs") | |
| 131 for fp in FilePath("input").walk(): | |
| 132 if fp.isdir(): | |
| 133 continue | |
| 134 if fp.splitext()[1] != '.n3': | |
| 135 continue | |
| 136 log.debug("read %s", fp) | |
| 137 # todo: if this fails, leave the report in the graph | |
| 138 self._fileGraph.parse(fp.open(), format="n3") | |
| 139 self._combinedGraph = None | |
| 140 | |
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141 self.onChangeLocal() |
| 275 | 142 |
| 143 def addOneShot(self, g): | |
| 144 """ | |
| 145 add this graph to the total, call onChange, and then revert | |
| 146 the addition of this graph | |
| 147 """ | |
| 148 self._oneShotAdditionGraph = g | |
| 149 self._combinedGraph = None | |
| 150 try: | |
| 314 | 151 self.onChangeLocal(oneShot=True, oneShotGraph=g) |
| 275 | 152 finally: |
| 153 self._oneShotAdditionGraph = None | |
| 154 self._combinedGraph = None | |
| 155 | |
| 281 | 156 def addOneShotFromString(self, body, contentType): |
| 157 g = parseRdf(body, contentType) | |
| 158 if not len(g): | |
| 159 log.warn("incoming oneshot graph had no statements: %r", body) | |
| 160 return 0 | |
| 161 t1 = time.time() | |
| 162 self.addOneShot(g) | |
| 163 return time.time() - t1 | |
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164 |
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165 @COMBINE_GRAPH_CALLS.time() |
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166 def getGraph(self) -> ConjunctiveGraph: |
| 275 | 167 """rdflib Graph with the file+remote contents of the input graph""" |
| 168 # this could be much faster with the combined readonly graph | |
| 169 # view from rdflib | |
| 170 if self._combinedGraph is None: | |
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171 self._combinedGraph = ConjunctiveGraph() |
| 275 | 172 if self._fileGraph: |
| 173 for s in self._fileGraph: | |
| 174 self._combinedGraph.add(s) | |
| 303 | 175 for s in self._remoteData.graph: |
| 176 self._combinedGraph.add(s) | |
| 275 | 177 if self._oneShotAdditionGraph: |
| 178 for s in self._oneShotAdditionGraph: | |
| 179 self._combinedGraph.add(s) | |
| 180 | |
| 181 return self._combinedGraph |