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annotate rdfdb/syncedgraph.py @ 1:674833ada390

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no light9 package; rdfdb is now a toplevel name Ignore-this: 2b7d8c53df9e62c9d3fbb38b083b122f
author Drew Perttula <drewp@bigasterisk.com>
date Sun, 18 Feb 2018 09:17:36 +0000
parents d487d597ad33
children c9d1764d64ad
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1 """
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2 client code uses a SyncedGraph, which has a few things:
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3
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4 AutoDepGraphApi - knockoutjs-inspired API for querying the graph in a
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5 way that lets me call you again when there were changes to the things
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6 you queried
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7
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8 CurrentStateGraphApi - a way to query the graph that doesn't gather
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9 your dependencies like AutoDepGraphApi does
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10
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11 GraphEditApi - methods to write patches to the graph for common
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12 operations, e.g. replacing a value, or editing a mapping
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13
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14 PatchReceiver - our web server that listens to edits from the master graph
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15
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16 PatchSender - collects and transmits your graph edits
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17 """
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18
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19 from rdflib import ConjunctiveGraph
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20 import logging, cyclone.httpclient, traceback
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21 from twisted.internet import defer
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22 import treq, json
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23 log = logging.getLogger('syncedgraph')
1
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24 from rdfdb.rdflibpatch import patchQuads
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25
1
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26 from rdfdb.patchsender import PatchSender
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27 from rdfdb.patchreceiver import PatchReceiver
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28 from rdfdb.currentstategraphapi import CurrentStateGraphApi
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29 from rdfdb.autodepgraphapi import AutoDepGraphApi
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30 from rdfdb.grapheditapi import GraphEditApi
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31
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32 # everybody who writes literals needs to get this
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33 from rdflibpatch_literal import patch
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34 patch()
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35
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36
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37 class SyncedGraph(CurrentStateGraphApi, AutoDepGraphApi, GraphEditApi):
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38 """
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39 graph for clients to use. Changes are synced with the master graph
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40 in the rdfdb process.
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41
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42 This api is like rdflib.Graph but it can also call you back when
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43 there are graph changes to the parts you previously read.
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44
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45 You may want to attach to self.initiallySynced deferred so you
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46 don't attempt patches before we've heard the initial contents of
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47 the graph. It would be ok to accumulate some patches of new
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48 material, but usually you won't correctly remove the existing
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49 statements unless we have the correct graph.
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50
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51 If we get out of sync, we abandon our local graph (even any
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52 pending local changes) and get the data again from the
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53 server.
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54 """
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55 def __init__(self, rdfdbRoot, label):
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56 """
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57 label is a string that the server will display in association
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58 with your connection
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59 """
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60 self.rdfdbRoot = rdfdbRoot
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61 self.initiallySynced = defer.Deferred()
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62 self._graph = ConjunctiveGraph()
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63
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64 self._receiver = PatchReceiver(self.rdfdbRoot, label, self._onPatch)
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65
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66 self._sender = PatchSender(self.rdfdbRoot + 'patches',
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67 self._receiver.updateResource)
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68 AutoDepGraphApi.__init__(self)
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69 # this needs more state to track if we're doing a resync (and
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70 # everything has to error or wait) or if we're live
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71
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72 def resync(self):
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73 """
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74 get the whole graph again from the server (e.g. we had a
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75 conflict while applying a patch and want to return to the
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76 truth).
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77
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78 To avoid too much churn, we remember our old graph and diff it
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79 against the replacement. This way, our callers only see the
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80 corrections.
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81
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82 Edits you make during a resync will surely be lost, so I
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83 should just fail them. There should be a notification back to
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84 UIs who want to show that we're doing a resync.
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85 """
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86 log.info('resync')
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87 self._sender.cancelAll()
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88 # this should be locked so only one resync goes on at once
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89 return cyclone.httpclient.fetch(
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90 url=self.rdfdbRoot + "graph",
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91 method="GET",
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92 headers={'Accept':['x-trig']},
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93 ).addCallback(self._resyncGraph)
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94
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95 def _resyncGraph(self, response):
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96 log.warn("new graph in")
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97
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98 #diff against old entire graph
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99 #broadcast that change
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100
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101 def patch(self, p):
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102 """send this patch to the server and apply it to our local
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103 graph and run handlers"""
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104
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105 if p.isNoop():
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106 log.info("skipping no-op patch")
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107 return
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108
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109 # these could fail if we're out of sync. One approach:
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110 # Rerequest the full state from the server, try the patch
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111 # again after that, then give up.
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112 debugKey = '[id=%s]' % (id(p) % 1000)
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113 log.debug("\napply local patch %s %s", debugKey, p)
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114 try:
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115 patchQuads(self._graph,
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116 deleteQuads=p.delQuads,
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117 addQuads=p.addQuads,
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118 perfect=True)
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119 except ValueError as e:
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120 log.error(e)
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121 self.sendFailed(None)
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122 return
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123 log.debug('runDepsOnNewPatch')
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124 self.runDepsOnNewPatch(p)
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125 log.debug('sendPatch')
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126 self._sender.sendPatch(p).addErrback(self.sendFailed)
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127 log.debug('patch is done %s', debugKey)
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128
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129 def suggestPrefixes(self, ctx, prefixes):
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130 """
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131 when writing files for this ctx, try to use these n3
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132 prefixes. async, not guaranteed to finish before any
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133 particular file flush
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134 """
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135 treq.post(self.rdfdbRoot + 'prefixes', json.dumps({'ctx': ctx, 'prefixes': prefixes}))
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136
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137 def sendFailed(self, result):
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138 """
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139 we asked for a patch to be queued and sent to the master, and
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140 that ultimately failed because of a conflict
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141 """
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142 log.warn("sendFailed")
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143 self.resync()
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144
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145 #i think we should receive back all the pending patches,
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146 #do a resync here,
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147 #then requeue all the pending patches (minus the failing one?) after that's done.
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148
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149 def _onPatch(self, p):
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150 """
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151 central server has sent us a patch
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152 """
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153 log.debug('_onPatch server has sent us %s', p)
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154 patchQuads(self._graph, p.delQuads, p.addQuads, perfect=True)
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155 log.debug("graph now has %s statements" % len(self._graph))
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156 try:
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157 self.runDepsOnNewPatch(p)
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158 except Exception:
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159 # don't reflect this error back to the server; we did
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160 # receive its patch correctly. However, we're in a bad
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161 # state since some dependencies may not have rerun
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162 traceback.print_exc()
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163 log.warn("some graph dependencies may not have completely run")
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164
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165 if self.initiallySynced:
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166 self.initiallySynced.callback(None)
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167 self.initiallySynced = None