annotate service/rfid_pn532_py/rfid.py @ 1240:3930f997ceeb

debug Deferreds in -v mode Ignore-this: 10af9d1591a19f9db15fa0bccc00ee1 darcs-hash:8333cbce90f1919d0e201ef1c9aa91a3fa94c2e8
author drewp <drewp@bigasterisk.com>
date Sat, 13 Apr 2019 20:23:35 -0700
parents 0bc41be76de7
children e1f33b9fb3df
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1 import os
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2 os.environ['LIBNFC_DEFAULT_DEVICE'] = "pn532_uart:/dev/ttyUSB0"
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3
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4 from docopt import docopt
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5 from rdfdb.patch import Patch
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6 from patchablegraph import PatchableGraph, CycloneGraphHandler, CycloneGraphEventsHandler
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7 from rdflib import Namespace, URIRef, Literal, Graph
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8 from rdflib.parser import StringInputSource
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9 from twisted.internet import reactor, task, defer
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10 import cyclone.web
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11 from cyclone.httpclient import fetch
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12 import cyclone
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13 import logging, time, json, random, string, traceback
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14 from logsetup import log, enableTwistedLog
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15 from greplin import scales
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16 from greplin.scales.cyclonehandler import StatsHandler
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17 from export_to_influxdb import InfluxExporter
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18 from tags import NfcDevice, FakeNfc, NfcError, AuthFailedError
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19
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20 ROOM = Namespace('http://projects.bigasterisk.com/room/')
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21
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22 ctx = ROOM['frontDoorWindowRfidCtx']
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23
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24 STATS = scales.collection('/root',
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25 scales.PmfStat('cardReadPoll'),
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26 scales.IntStat('newCardReads'),
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27 )
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28
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29 class OutputPage(cyclone.web.RequestHandler):
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30 def put(self):
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31 arg = self.request.arguments
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32 if arg.get('s') and arg.get('p'):
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33 self._onQueryStringStatement(arg['s'][-1], arg['p'][-1], self.request.body)
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34 else:
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35 self._onGraphBodyStatements(self.request.body, self.request.headers)
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36 post = put
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37 def _onQueryStringStatement(self, s, p, body):
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38 subj = URIRef(s)
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39 pred = URIRef(p)
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40 turtleLiteral = self.request.body
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41 try:
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42 obj = Literal(float(turtleLiteral))
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43 except ValueError:
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44 obj = Literal(turtleLiteral)
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45 self._onStatements([(subj, pred, obj)])
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46
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47 def _onGraphBodyStatements(self, body, headers):
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48 g = Graph()
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49 g.parse(StringInputSource(body), format='nt')
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50 if not g:
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51 raise ValueError("expected graph body")
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52 self._onStatements(list(g.triples((None, None, None))))
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53 post = put
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54
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55 def _onStatements(self, stmts):
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56 # write rfid to new key, etc.
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57 if len(stmts) > 0 and stmts[0][1] == ROOM['keyContents']:
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58 return
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59 log.warn("ignoring %s", stmts)
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60
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61 def uidUri(card_id):
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62 return URIRef('http://bigasterisk.com/rfidCard/%s' % card_id)
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63
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64 BODY_VERSION = "1"
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65 def randomBody():
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66 return BODY_VERSION + '*' + ''.join(random.choice(string.ascii_uppercase) for n in range(16 - 2))
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67
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68 def looksLikeBigasterisk(text):
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69 return text.startswith(BODY_VERSION + "*")
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70
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71 class Rewrite(cyclone.web.RequestHandler):
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72 def post(self):
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73 agent = URIRef(self.request.headers['x-foaf-agent'])
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74 body = json.loads(self.request.body)
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75
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76 _, uid = reader.read_id()
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77 log.info('current card id: %r %r', _, uid)
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78 if uid is None:
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79 self.set_status(404, "no card present")
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80 # maybe retry a few more times since the card might be nearby
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81 return
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82
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83 text = randomBody()
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84 log.info('%s rewrites %s to %s, to be owned by %s',
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85 agent, uid, text, body['user'])
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86
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87 #reader.KEY = private.rfid_key
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88 reader.write(uid, text)
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89 log.info('done with write')
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90
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91
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92 sensor = ROOM['frontDoorWindowRfid']
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93
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94 class ReadLoop(object):
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95 def __init__(self, reader, masterGraph, overwrite_any_tag):
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96 self.reader = reader
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97 self.masterGraph = masterGraph
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98 self.overwrite_any_tag = overwrite_any_tag
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99 self.log = {} # cardIdUri : most recent seentime
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100
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101 self.pollPeriodSecs = .1
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102 self.expireSecs = 5
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103
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104 task.LoopingCall(self.poll).start(self.pollPeriodSecs)
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105
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106 @STATS.cardReadPoll.time()
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107 def poll(self):
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108 now = time.time()
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109
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110 self.flushOldReads(now)
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111
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112 try:
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113 for tag in self.reader.getTags(): # blocks for a bit
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114 uid = tag.uid()
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115 log.debug('detected tag uid=%r', uid)
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116 cardIdUri = uidUri(uid)
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117
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118 is_new = cardIdUri not in self.log
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119 self.log[cardIdUri] = now
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120 if is_new:
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121 STATS.newCardReads += 1
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122 tag.connect()
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123 try:
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124 textLit = Literal(tag.readBlock(1).rstrip('\x00'))
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125 if self.overwrite_any_tag and not looksLikeBigasterisk(textLit):
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126 log.info("block 1 was %r; rewriting it", textLit)
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127 tag.writeBlock(1, randomBody())
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128 textLit = Literal(tag.readBlock(1).rstrip('\x00'))
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129 finally:
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130 # This might not be appropriate to call after
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131 # readBlock fails. I am getting double
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132 # exceptions.
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133 tag.disconnect()
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134 self.startCardRead(cardIdUri, textLit)
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135 except AuthFailedError as e:
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136 log.error(e)
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137 except (NfcError, OSError) as e:
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138 traceback.print_exc()
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139 log.error(e)
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140 reactor.stop()
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141 def flushOldReads(self, now):
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142 for uri in list(self.log):
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143 if self.log[uri] < now - self.expireSecs:
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144 self.endCardRead(uri)
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145 del self.log[uri]
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146
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147 def startCardRead(self, cardUri, text):
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148 self.masterGraph.patch(Patch(addQuads=[
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149 (sensor, ROOM['reading'], cardUri, ctx),
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150 (cardUri, ROOM['cardText'], text, ctx)],
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151 delQuads=[]))
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152 log.info('%s :cardText %s .', cardUri.n3(), text.n3())
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153 self._sendOneshot([(sensor, ROOM['startReading'], cardUri),
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154 (cardUri, ROOM['cardText'], text)])
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155
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156 def endCardRead(self, cardUri):
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157 log.debug(f'{cardUri} has been gone for {self.expireSecs} sec')
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158 delQuads = []
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159 for spo in self.masterGraph._graph.triples(
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160 (sensor, ROOM['reading'], cardUri)):
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161 delQuads.append(spo + (ctx,))
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162 for spo in self.masterGraph._graph.triples(
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163 (cardUri, ROOM['cardText'], None)):
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164 delQuads.append(spo + (ctx,))
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165
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166 self.masterGraph.patch(Patch(addQuads=[], delQuads=delQuads))
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167
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168 def _sendOneshot(self, oneshot):
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169 body = (' '.join('%s %s %s .' % (s.n3(), p.n3(), o.n3())
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170 for s,p,o in oneshot)).encode('utf8')
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171 url = b'http://bang:9071/oneShot'
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172 d = fetch(method=b'POST',
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173 url=url,
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174 headers={b'Content-Type': [b'text/n3']},
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175 postdata=body,
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176 timeout=5)
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177 def err(e):
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178 log.info('oneshot post to %r failed: %s',
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179 url, e.getErrorMessage())
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180 d.addErrback(err)
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181
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182
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183
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184 if __name__ == '__main__':
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185 arg = docopt("""
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186 Usage: rfid.py [options]
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187
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188 -v Verbose
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189 --overwrite_any_tag Rewrite any unknown tag with a new random body
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190 -n Fake reader
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191 """)
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192 log.setLevel(logging.INFO)
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193 if arg['-v']:
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194 enableTwistedLog()
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195 log.setLevel(logging.DEBUG)
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196 log.info(f'cyclone {cyclone.__version__}')
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197 defer.setDebugging(True)
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198
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199 masterGraph = PatchableGraph()
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200 reader = NfcDevice() if not arg['-n'] else FakeNfc()
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201
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202 ie=InfluxExporter(Graph())
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203 ie.exportStats(STATS, ['root.cardReadPoll.count',
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204 'root.cardReadPoll.95percentile',
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205 'root.newCardReads',
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206 ],
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207 period_secs=10,
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208 retain_days=7,
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209 )
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210
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211 loop = ReadLoop(reader, masterGraph, overwrite_any_tag=arg['--overwrite_any_tag'])
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212
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213 port = 10012
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214 reactor.listenTCP(port, cyclone.web.Application([
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215 (r"/(|.+\.html)", cyclone.web.StaticFileHandler,
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216 {"path": ".", "default_filename": "index.html"}),
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217 (r"/graph", CycloneGraphHandler, {'masterGraph': masterGraph}),
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218 (r"/graph/events", CycloneGraphEventsHandler,
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219 {'masterGraph': masterGraph}),
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220 (r'/output', OutputPage),
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221 (r'/rewrite', Rewrite),
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222 (r'/stats/(.*)', StatsHandler, {'serverName': 'rfid'}),
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223 ], masterGraph=masterGraph, debug=arg['-v']), interface='::')
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224 log.warn('serving on %s', port)
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225
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226 reactor.run()