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annotate lib/patchablegraph.py @ 1075:32bbce76134e

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update piNode host configs Ignore-this: 8287428b4140dedbed03633d3fd2790e darcs-hash:af94e45d5f667f81471c2169cff2a11c9a0dcf56
author drewp <drewp@bigasterisk.com>
date Thu, 14 Apr 2016 00:16:27 -0700
parents ffe6a00c6cef
children 8d89da1915df
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1 """
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2 Design:
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3
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4 1. Services each have (named) graphs, which they patch as things
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5 change. PatchableGraph is an object for holding this graph.
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6 2. You can http GET that graph, or ...
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7 3. You can http GET/SSE that graph and hear about modifications to it
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8 4. The client that got the graph holds and maintains a copy. The
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9 client may merge together multiple graphs.
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10 5. Client queries its graph with low-level APIs or client-side sparql.
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11 6. When the graph changes, the client knows and can update itself at
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12 low or high granularity.
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13
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14
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15 See also:
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16 * http://iswc2007.semanticweb.org/papers/533.pdf RDFSync: efficient remote synchronization of RDF
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17 models
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18 * https://www.w3.org/2009/12/rdf-ws/papers/ws07 Supporting Change Propagation in RDF
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19 * https://www.w3.org/DesignIssues/lncs04/Diff.pdf Delta: an ontology for the distribution of
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20 differences between RDF graphs
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21
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22 """
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23 import sys, json, logging
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24 import cyclone.sse
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25 sys.path.append("/my/proj/light9")
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26 from light9.rdfdb.grapheditapi import GraphEditApi
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27 from rdflib import ConjunctiveGraph
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28 from light9.rdfdb.rdflibpatch import patchQuads
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29 from rdflib_jsonld.serializer import from_rdf
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30 from cycloneerr import PrettyErrorHandler
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31
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32 log = logging.getLogger('patchablegraph')
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33
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34 def writeGraphResponse(req, graph, acceptHeader):
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35 if acceptHeader == 'application/nquads':
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36 req.set_header('Content-type', 'application/nquads')
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37 graph.serialize(req, format='nquads')
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38 elif acceptHeader == 'application/ld+json':
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39 req.set_header('Content-type', 'application/ld+json')
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40 graph.serialize(req, format='json-ld', indent=2)
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41 else:
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42 req.set_header('Content-type', 'application/x-trig')
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43 graph.serialize(req, format='trig')
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44
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45 # forked from /my/proj/light9/light9/rdfdb/rdflibpatch.py
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46 def _graphFromQuads2(q):
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47 g = ConjunctiveGraph()
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48 #g.addN(q) # no effect on nquad output
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49 for s,p,o,c in q:
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50 g.get_context(c).add((s,p,o)) # kind of works with broken rdflib nquad serializer code
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51 #g.store.add((s,p,o), c) # no effect on nquad output
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52 return g
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53
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54 def patchAsJson(p):
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55 return json.dumps({'patch': {
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56 'adds': from_rdf(_graphFromQuads2(p.addQuads)),
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57 'deletes': from_rdf(_graphFromQuads2(p.delQuads)),
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58 }})
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59
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60 def graphAsJson(g):
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61 # This is not the same as g.serialize(format='json-ld')! That
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62 # version omits literal datatypes.
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63 return json.dumps(from_rdf(g))
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64
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65 class PatchableGraph(GraphEditApi):
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66 """
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67 Master graph that you modify with self.patch, and we get the
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68 updates to all current listeners.
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69 """
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70 def __init__(self):
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71 self._graph = ConjunctiveGraph()
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72 self._observers = []
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73
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74 def serialize(self, to, **kw):
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75 return self._graph.serialize(to, **kw)
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76
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77 def patch(self, p):
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78 if p.isNoop():
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79 return
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80 patchQuads(self._graph,
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81 deleteQuads=p.delQuads,
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82 addQuads=p.addQuads,
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83 perfect=False) # true?
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84 for ob in self._observers:
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85 ob(patchAsJson(p))
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86
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87 def asJsonLd(self):
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88 return graphAsJson(self._graph)
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89
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90 def addObserver(self, onPatch):
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91 self._observers.append(onPatch)
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92
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93 def removeObserver(self, onPatch):
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94 try:
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95 self._observers.remove(onPatch)
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96 except ValueError:
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97 pass
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98
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99
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100 class CycloneGraphHandler(PrettyErrorHandler, cyclone.web.RequestHandler):
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101 def initialize(self, masterGraph):
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102 self.masterGraph = masterGraph
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103
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104 def get(self):
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105 writeGraphResponse(self, self.masterGraph,
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106 self.request.headers.get('accept'))
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107
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108 class CycloneGraphEventsHandler(cyclone.sse.SSEHandler):
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109 """
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110 One session with one client.
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111
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112 returns current graph plus future patches to keep remote version
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113 in sync with ours.
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114
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115 intsead of turning off buffering all over, it may work for this
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116 response to send 'x-accel-buffering: no', per
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117 http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffering
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118 """
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119 def __init__(self, application, request, masterGraph):
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120 cyclone.sse.SSEHandler.__init__(self, application, request)
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121 self.masterGraph = masterGraph
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122
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123 def bind(self):
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124 graphJson = self.masterGraph.asJsonLd()
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125 log.debug("send fullGraph event: %s", graphJson)
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126 self.sendEvent(message=graphJson, event='fullGraph')
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127 self.masterGraph.addObserver(self.onPatch)
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128
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129 def onPatch(self, patchJson):
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130 # throttle and combine patches here- ideally we could see how
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131 # long the latency to the client is to make a better rate choice
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132 self.sendEvent(message=patchJson, event='patch')
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133
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134 def unbind(self):
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135 self.masterGraph.removeObserver(self.onPatch)
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136