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275
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1 import logging, time
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2
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3 from rdflib import Graph, ConjunctiveGraph
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4 from rdflib import Namespace, URIRef, Literal, RDF
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281
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5 from rdflib.parser import StringInputSource
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275
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6
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7 from twisted.python.filepath import FilePath
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8 from twisted.internet.defer import inlineCallbacks, gatherResults
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9
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10 from rdflibtrig import addTrig
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11 from graphop import graphEqual
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12
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13 log = logging.getLogger('fetch')
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14
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15 ROOM = Namespace("http://projects.bigasterisk.com/room/")
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16 DEV = Namespace("http://projects.bigasterisk.com/device/")
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17
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18
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281
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19 def parseRdf(text, contentType):
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20 g = Graph()
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21 g.parse(StringInputSource(text), format={
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22 'text/n3': 'n3',
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23 }[contentType])
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24 return g
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25
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26
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275
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27 class InputGraph(object):
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28 def __init__(self, inputDirs, onChange, sourceSubstr=None):
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29 """
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30 this has one Graph that's made of:
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31 - all .n3 files from inputDirs (read at startup)
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32 - all the remote graphs, specified in the file graphs
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33
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34 call updateFileData or updateRemoteData to reread those
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35 graphs. getGraph to access the combined graph.
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36
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37 onChange(self) is called if the contents of the full graph
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38 change (in an interesting way) during updateFileData or
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39 updateRemoteData. Interesting means statements other than the
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40 ones with the predicates on the boring list. onChange(self,
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41 oneShot=True) means: don't store the result of this change
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42 anywhere; it needs to be processed only once
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43
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44 sourceSubstr filters to only pull from sources containing the
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45 string (for debugging).
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46 """
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47 self.inputDirs = inputDirs
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48 self.onChange = onChange
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49 self.sourceSubstr = sourceSubstr
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50 self._fileGraph = Graph()
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51 self._remoteGraph = None
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52 self._combinedGraph = None
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53 self._oneShotAdditionGraph = None
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54 self._lastErrLog = {} # source: error
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55
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56 def updateFileData(self):
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57 """
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58 make sure we contain the correct data from the files in inputDirs
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59 """
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60 # this sample one is actually only needed for the output, but I don't
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61 # think I want to have a separate graph for the output
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62 # handling
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63 log.debug("read file graphs")
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64 for fp in FilePath("input").walk():
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65 if fp.isdir():
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66 continue
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67 if fp.splitext()[1] != '.n3':
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68 continue
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69 log.debug("read %s", fp)
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70 # todo: if this fails, leave the report in the graph
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71 self._fileGraph.parse(fp.open(), format="n3")
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72 self._combinedGraph = None
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73
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74 self.onChange(self)
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75
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76 @inlineCallbacks
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77 def updateRemoteData(self):
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78 """
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79 read all remote graphs (which are themselves enumerated within
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80 the file data)
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81 """
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82 t1 = time.time()
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83 log.debug("read remote graphs")
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84 g = ConjunctiveGraph()
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85
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86 @inlineCallbacks
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87 def fetchOne(source):
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88 try:
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89 fetchTime = yield addTrig(g, source, timeout=5)
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90 except Exception, e:
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91 e = str(e)
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92 if self._lastErrLog.get(source) != e:
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93 log.error(" can't add source %s: %s", source, e)
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94 self._lastErrLog[source] = e
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95 g.add((URIRef(source), ROOM['graphLoadError'], Literal(e)))
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96 g.add((URIRef(source), RDF.type, ROOM['FailedGraphLoad']))
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97 else:
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98 if self._lastErrLog.get(source):
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99 log.warning(" source %s is back", source)
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100 self._lastErrLog[source] = None
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101 g.add((URIRef(source), ROOM['graphLoadMs'],
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102 Literal(round(fetchTime * 1000, 1))))
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103
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104 fetchDone = []
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105 filtered = 0
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106 for source in self._fileGraph.objects(ROOM['reasoning'],
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107 ROOM['source']):
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108 if self.sourceSubstr and self.sourceSubstr not in source:
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109 filtered += 1
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110 continue
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111 fetchDone.append(fetchOne(source))
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112 yield gatherResults(fetchDone, consumeErrors=True)
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113 log.debug("loaded %s (skipping %s) in %.1f ms", len(fetchDone),
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114 filtered, 1000 * (time.time() - t1))
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115
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116 prevGraph = self._remoteGraph
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117 self._remoteGraph = g
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118 self._combinedGraph = None
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119 if (prevGraph is None or
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120 not graphEqual(g, prevGraph, ignorePredicates=[
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121 ROOM['signalStrength'],
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122 # perhaps anything with a number-datatype for its
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123 # object should be filtered out, and you have to make
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124 # an upstream quantization (e.g. 'temp high'/'temp
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125 # low') if you want to do reasoning on the difference
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126 URIRef("http://bigasterisk.com/map#lastSeenAgoSec"),
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127 URIRef("http://bigasterisk.com/map#lastSeenAgo"),
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128 ROOM['usingPower'],
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129 ROOM['idleTimeMinutes'],
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130 ROOM['idleTimeMs'],
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131 ROOM['graphLoadMs'],
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132 ROOM['localTimeToSecond'],
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133 ROOM['history'],
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134 ROOM['temperatureF'],
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135 ROOM['connectedAgo'],
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136 ])):
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137 log.debug(" remote graph changed")
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138 self.onChange(self)
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139 else:
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140 log.debug(" remote graph has no changes to trigger rules")
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141
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142 def addOneShot(self, g):
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143 """
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144 add this graph to the total, call onChange, and then revert
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145 the addition of this graph
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146 """
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147 self._oneShotAdditionGraph = g
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148 self._combinedGraph = None
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149 try:
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150 self.onChange(self, oneShot=True, oneShotGraph=g)
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151 finally:
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152 self._oneShotAdditionGraph = None
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153 self._combinedGraph = None
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154
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281
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155 def addOneShotFromString(self, body, contentType):
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156 g = parseRdf(body, contentType)
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157 if not len(g):
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158 log.warn("incoming oneshot graph had no statements: %r", body)
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159 return 0
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160 t1 = time.time()
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161 self.addOneShot(g)
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162 return time.time() - t1
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163
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275
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164 def getGraph(self):
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165 """rdflib Graph with the file+remote contents of the input graph"""
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166 # this could be much faster with the combined readonly graph
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167 # view from rdflib
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168 if self._combinedGraph is None:
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169 self._combinedGraph = Graph()
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170 if self._fileGraph:
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171 for s in self._fileGraph:
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172 self._combinedGraph.add(s)
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173 if self._remoteGraph:
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174 for s in self._remoteGraph:
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175 self._combinedGraph.add(s)
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176 if self._oneShotAdditionGraph:
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177 for s in self._oneShotAdditionGraph:
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178 self._combinedGraph.add(s)
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179
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180 return self._combinedGraph
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