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annotate service/piNode/piNode.py @ 466:1122016d16eb

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stats handler, events output fix, build updaets Ignore-this: 3f2d695e0e49e8be8084017de08b0539
author drewp@bigasterisk.com
date Sat, 20 Apr 2019 23:40:29 -0700
parents 0787cd64ecf8
children 98384c3ccd33
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1 from __future__ import division
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2 import sys, logging, socket, json, time
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3 import cyclone.web
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4 from cyclone.httpclient import fetch
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5 from rdflib import Namespace, URIRef, Literal, Graph, RDF, ConjunctiveGraph
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6 from rdflib.parser import StringInputSource
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7 from twisted.internet import reactor, task
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8 from twisted.internet.threads import deferToThread
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9 from docopt import docopt
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10 import etcd3
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11 from greplin import scales
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12 from greplin.scales.cyclonehandler import StatsHandler
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13
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14 logging.basicConfig(level=logging.DEBUG)
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15
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16 sys.path.append("../../lib")
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17 from patchablegraph import PatchableGraph, CycloneGraphHandler, CycloneGraphEventsHandler
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18
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19 from rdfdb.rdflibpatch import inContext
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20 from rdfdb.patch import Patch
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21
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22 try:
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23 import pigpio
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24 except ImportError:
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25 class pigpio(object):
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26 @staticmethod
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27 def pi():
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28 return None
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29
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30 import devices
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31 from export_to_influxdb import InfluxExporter
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32
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33 log = logging.getLogger()
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34 logging.getLogger('serial').setLevel(logging.WARN)
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35
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36 ROOM = Namespace('http://projects.bigasterisk.com/room/')
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37 HOST = Namespace('http://bigasterisk.com/ruler/host/')
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38
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39 hostname = socket.gethostname()
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40 CTX = ROOM['pi/%s' % hostname]
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41
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42 STATS = scales.collection('/root',
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43 )
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44 def patchRandid():
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45 """
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46 I'm concerned urandom is slow on raspberry pi, and I'm adding to
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47 graphs a lot. Unclear what the ordered return values might do to
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48 the balancing of the graph.
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49 """
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50 _id_serial = [1000]
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51 def randid():
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52 _id_serial[0] += 1
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53 return _id_serial[0]
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54 import rdflib.plugins.memory
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55 rdflib.plugins.memory.randid = randid
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56 patchRandid()
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57
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58 class Config(object):
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59 def __init__(self, masterGraph, hubHost):
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60 self.etcd = etcd3.client(host=hubHost, port=9022)
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61
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62 self.masterGraph = masterGraph
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63 self.hubHost = hubHost
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64 self.configGraph = ConjunctiveGraph()
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65 self.boards = []
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66 self.etcPrefix = 'pi/'
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67
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68 self.reread()
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69
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70 deferToThread(self.watchEtcd)
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71
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72 def watchEtcd(self):
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73 events, cancel = self.etcd.watch_prefix(self.etcPrefix)
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74 reactor.addSystemEventTrigger('before', 'shutdown', cancel)
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75 for ev in events:
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76 log.info('%s changed', ev.key)
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77 reactor.callFromThread(self.configChanged)
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78
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79 def configChanged(self):
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80 self.cancelRead()
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81 self.rereadLater = reactor.callLater(.1, self.reread)
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82
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83 def cancelRead(self):
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84 if getattr(self, 'rereadLater', None):
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85 self.rereadLater.cancel()
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86 self.rereadLater = None
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87
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88 def reread(self):
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89 self.rereadLater = None
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90 log.info('read config')
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91 self.configGraph = ConjunctiveGraph()
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92 for v, md in self.etcd.get_prefix(self.etcPrefix):
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93 log.info(' read file %r', md.key)
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94 self.configGraph.parse(StringInputSource(v), format='n3')
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95 self.configGraph.bind('', ROOM)
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96 self.configGraph.bind('rdf', RDF)
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97 # config graph is too noisy; maybe make it a separate resource
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98 #masterGraph.patch(Patch(addGraph=self.configGraph))
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99 self.setupBoards()
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100
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101 def setupBoards(self):
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102 thisHost = Literal(hostname)
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103 for row in self.configGraph.query(
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104 'SELECT ?board WHERE { ?board a :PiBoard; :hostname ?h }',
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105 initBindings=dict(h=thisHost)):
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106 thisBoard = row.board
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107 break
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108 else:
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109 log.warn("config had no board for :hostname %s. Waiting for config update." %
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110 thisHost)
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111 self.boards = []
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112 return
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113
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114 log.info("found config for board %r" % thisBoard)
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115 self.boards = [Board(self.configGraph, self.masterGraph, thisBoard, self.hubHost)]
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116 self.boards[0].startPolling()
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117
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118
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119 class Board(object):
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120 """similar to arduinoNode.Board but without the communications stuff"""
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121 def __init__(self, graph, masterGraph, uri, hubHost):
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122 self.graph, self.uri = graph, uri
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123 self.hubHost = hubHost
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124 self.masterGraph = masterGraph
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125 self.masterGraph.setToGraph(self.staticStmts())
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126 self.pi = pigpio.pi()
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127 self._devs = devices.makeDevices(graph, self.uri, self.pi)
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128 log.debug('found %s devices', len(self._devs))
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129 self._statementsFromInputs = {} # input device uri: latest statements
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130 self._lastPollTime = {} # input device uri: time()
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131 self._influx = InfluxExporter(self.graph)
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132 for d in self._devs:
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133 self.syncMasterGraphToHostStatements(d)
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134
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135 def startPolling(self):
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136 task.LoopingCall(self._poll).start(.05)
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137
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138 def _poll(self):
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139 try:
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140 self._pollMaybeError()
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141 except Exception:
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142 log.exception("During poll:")
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143
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144 def _pollMaybeError(self):
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145 pollTime = {} # uri: sec
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146 for i in self._devs:
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147 now = time.time()
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148 if (hasattr(i, 'pollPeriod') and
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149 self._lastPollTime.get(i.uri, 0) + i.pollPeriod > now):
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150 continue
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151 new = i.poll()
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152 pollTime[i.uri] = time.time() - now
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153 if isinstance(new, dict): # new style
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154 oneshot = new['oneshot']
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155 new = new['latest']
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156 else:
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157 oneshot = None
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158
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159 self._updateMasterWithNewPollStatements(i.uri, new)
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160
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161 if oneshot:
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diff changeset
162 self._sendOneshot(oneshot)
243
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163 self._lastPollTime[i.uri] = now
304
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164 if log.isEnabledFor(logging.DEBUG):
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165 log.debug('poll times:')
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166 for u, s in sorted(pollTime.items()):
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167 log.debug(" %.4f ms %s", s * 1000, u)
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168 log.debug('total poll time: %f ms', sum(pollTime.values()) * 1000)
338
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169
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170 pollResults = map(set, self._statementsFromInputs.values())
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171 if pollResults:
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172 self._influx.exportToInflux(set.union(*pollResults))
221
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173
349
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174 def _updateMasterWithNewPollStatements(self, dev, new):
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175 prev = self._statementsFromInputs.get(dev, set())
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176
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177 # it's important that quads from different devices
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178 # don't clash, since that can lead to inconsistent
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179 # patches (e.g.
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180 # dev1 changes value from 1 to 2;
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181 # dev2 changes value from 2 to 3;
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182 # dev1 changes from 2 to 4 but this patch will
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183 # fail since the '2' statement is gone)
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184 self.masterGraph.patch(Patch.fromDiff(inContext(prev, dev),
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185 inContext(new, dev)))
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186 self._statementsFromInputs[dev] = new
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187
251
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188 def _sendOneshot(self, oneshot):
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189 body = (' '.join('%s %s %s .' % (s.n3(), p.n3(), o.n3())
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190 for s,p,o in oneshot)).encode('utf8')
408
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191 url = 'http://%s:9071/oneShot' % self.hubHost
271
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192 d = fetch(method='POST',
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193 url=url,
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194 headers={'Content-Type': ['text/n3']},
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195 postdata=body,
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196 timeout=5)
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197 def err(e):
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198 log.info('oneshot post to %r failed: %s',
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199 url, e.getErrorMessage())
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200 d.addErrback(err)
251
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201
233
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202 def outputStatements(self, stmts):
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203 unused = set(stmts)
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204 for dev in self._devs:
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205 stmtsForDev = []
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206 for pat in dev.outputPatterns():
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207 if [term is None for term in pat] != [False, False, True]:
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208 raise NotImplementedError
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209 for stmt in stmts:
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210 if stmt[:2] == pat[:2]:
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211 stmtsForDev.append(stmt)
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212 unused.discard(stmt)
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213 if stmtsForDev:
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214 log.info("output goes to action handler for %s" % dev.uri)
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215 dev.sendOutput(stmtsForDev)
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216
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217 # Dev *could* change hostStatements at any time, and
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218 # we're not currently tracking that, but the usual is
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219 # to change them in response to sendOutput so this
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220 # should be good enough. The right answer is to give
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221 # each dev the masterGraph for it to write to.
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222 self.syncMasterGraphToHostStatements(dev)
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223 log.info("output and masterGraph sync complete")
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224 if unused:
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225 log.info("Board %s doesn't care about these statements:", self.uri)
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226 for s in unused:
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227 log.warn("%r", s)
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228
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229 def syncMasterGraphToHostStatements(self, dev):
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230 hostStmtCtx = URIRef(dev.uri + '/host')
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diff changeset
231 newQuads = inContext(dev.hostStatements(), hostStmtCtx)
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diff changeset
232 p = self.masterGraph.patchSubgraph(hostStmtCtx, newQuads)
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diff changeset
233 log.debug("patch master with these host stmts %s", p)
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diff changeset
234
226
1e8ef0daf0f8 piNode uses new graph SSE code
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diff changeset
235 def staticStmts(self):
233
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diff changeset
236 return [(HOST[hostname], ROOM['connectedTo'], self.uri, CTX)]
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237
183
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238 def description(self):
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239 """for web page"""
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240 return {
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241 'uri': self.uri,
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242 'devices': [d.description() for d in self._devs],
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243 'graph': 'http://sticker:9059/graph', #todo
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244 }
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245
233
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diff changeset
246 class Dot(cyclone.web.RequestHandler):
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diff changeset
247 def get(self):
347
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248 configGraph = self.settings.config.configGraph
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249 dot = dotrender.render(configGraph, self.settings.config.boards)
233
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diff changeset
250 self.write(dot)
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251
184
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diff changeset
252 def rdfGraphBody(body, headers):
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diff changeset
253 g = Graph()
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diff changeset
254 g.parse(StringInputSource(body), format='nt')
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255 return g
183
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diff changeset
256
182
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257 class OutputPage(cyclone.web.RequestHandler):
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258 def put(self):
184
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diff changeset
259 arg = self.request.arguments
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diff changeset
260 if arg.get('s') and arg.get('p'):
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diff changeset
261 subj = URIRef(arg['s'][-1])
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diff changeset
262 pred = URIRef(arg['p'][-1])
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diff changeset
263 turtleLiteral = self.request.body
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parents: 183
diff changeset
264 try:
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diff changeset
265 obj = Literal(float(turtleLiteral))
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diff changeset
266 except ValueError:
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diff changeset
267 obj = Literal(turtleLiteral)
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268 stmt = (subj, pred, obj)
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diff changeset
269 else:
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diff changeset
270 g = rdfGraphBody(self.request.body, self.request.headers)
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diff changeset
271 assert len(g) == 1, len(g)
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diff changeset
272 stmt = g.triples((None, None, None)).next()
182
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273
347
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diff changeset
274 for b in self.settings.config.boards:
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diff changeset
275 b.outputStatements([stmt])
182
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276
183
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diff changeset
277 class Boards(cyclone.web.RequestHandler):
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diff changeset
278 def get(self):
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diff changeset
279 self.set_header('Content-type', 'application/json')
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diff changeset
280 self.write(json.dumps({
233
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diff changeset
281 'host': hostname,
347
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282 'boards': [b.description() for b in self.settings.config.boards]
183
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diff changeset
283 }, indent=2))
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284
182
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285 def main():
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286 arg = docopt("""
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287 Usage: piNode.py [options]
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288
408
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289 -v Verbose
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diff changeset
290 --ow Just report onewire device URIs and readings, then exit.
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diff changeset
291 --hub=HOST Hostname for etc3 and oneshot posts. [default: bang.vpn-home.bigasterisk.com]
182
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292 """)
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293 log.setLevel(logging.WARN)
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294 if arg['-v']:
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295 from twisted.python import log as twlog
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296 twlog.startLogging(sys.stdout)
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297
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298 log.setLevel(logging.DEBUG)
233
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diff changeset
299
408
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diff changeset
300 if arg['--ow']:
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diff changeset
301 log.setLevel(logging.INFO)
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diff changeset
302 for stmt in devices.OneWire().poll():
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diff changeset
303 print stmt
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diff changeset
304 return
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diff changeset
305
226
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parents: 225
diff changeset
306 masterGraph = PatchableGraph()
408
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diff changeset
307 config = Config(masterGraph, arg['--hub'])
182
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308
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309 reactor.listenTCP(9059, cyclone.web.Application([
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310 (r"/()", cyclone.web.StaticFileHandler, {
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311 "path": "static", "default_filename": "index.html"}),
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312 (r'/static/(.*)', cyclone.web.StaticFileHandler, {"path": "static"}),
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313 (r'/stats/(.*)', StatsHandler, {'serverName': 'piNode'}),
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314 (r'/boards', Boards),
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315 (r"/graph", CycloneGraphHandler, {'masterGraph': masterGraph}),
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316 (r"/graph/events", CycloneGraphEventsHandler, {'masterGraph': masterGraph}),
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317 (r'/output', OutputPage),
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318 (r'/dot', Dot),
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319 ], config=config, debug=arg['-v']), interface='::')
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320 log.warn('serving on 9059')
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321 reactor.run()
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322
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323 main()