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annotate lib/patchablegraph.py @ 1103:b84e956771fc

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sse_collector now kind of gets concurrent requests right Ignore-this: e1a104d9ae81473b86fc12fbb8ac097b darcs-hash:1bc1655b532074d97d7b8b7dd65802a9c62b6ff9
author drewp <drewp@bigasterisk.com>
date Fri, 19 Aug 2016 22:37:01 -0700
parents ffe6a00c6cef
children a94f2a522d41
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 light9.rdfdb.patch import Patch
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30 from rdflib_jsonld.serializer import from_rdf
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31 from rdflib.parser import StringInputSource
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32 from cycloneerr import PrettyErrorHandler
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33
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34 log = logging.getLogger('patchablegraph')
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35
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36 def writeGraphResponse(req, graph, acceptHeader):
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37 if acceptHeader == 'application/nquads':
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38 req.set_header('Content-type', 'application/nquads')
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39 graph.serialize(req, format='nquads')
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40 elif acceptHeader == 'application/ld+json':
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41 req.set_header('Content-type', 'application/ld+json')
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42 graph.serialize(req, format='json-ld', indent=2)
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43 else:
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44 req.set_header('Content-type', 'application/x-trig')
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45 graph.serialize(req, format='trig')
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46
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47 # forked from /my/proj/light9/light9/rdfdb/rdflibpatch.py
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48 def _graphFromQuads2(q):
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49 g = ConjunctiveGraph()
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50 #g.addN(q) # no effect on nquad output
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51 for s,p,o,c in q:
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52 g.get_context(c).add((s,p,o)) # kind of works with broken rdflib nquad serializer code
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53 #g.store.add((s,p,o), c) # no effect on nquad output
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54 return g
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55
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56 def jsonFromPatch(p):
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57 return json.dumps({'patch': {
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58 'adds': from_rdf(_graphFromQuads2(p.addQuads)),
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59 'deletes': from_rdf(_graphFromQuads2(p.delQuads)),
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60 }})
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61 patchAsJson = jsonFromPatch # deprecated name
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62
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63
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64 def patchFromJson(j):
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65 body = json.loads(j)['patch']
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66 a = ConjunctiveGraph()
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67 a.parse(StringInputSource(json.dumps(body['adds'])), format='json-ld')
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68 d = ConjunctiveGraph()
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69 d.parse(StringInputSource(json.dumps(body['deletes'])), format='json-ld')
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70 return Patch(addGraph=a, delGraph=d)
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71
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72 def graphAsJson(g):
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73 # This is not the same as g.serialize(format='json-ld')! That
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74 # version omits literal datatypes.
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75 return json.dumps(from_rdf(g))
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76
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77 class PatchableGraph(GraphEditApi):
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78 """
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79 Master graph that you modify with self.patch, and we get the
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80 updates to all current listeners.
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81 """
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82 def __init__(self):
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83 self._graph = ConjunctiveGraph()
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84 self._observers = []
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85
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86 def serialize(self, to, **kw):
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87 return self._graph.serialize(to, **kw)
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88
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89 def patch(self, p):
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90 if p.isNoop():
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91 return
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92 patchQuads(self._graph,
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93 deleteQuads=p.delQuads,
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94 addQuads=p.addQuads,
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95 perfect=False) # true?
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96 for ob in self._observers:
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97 ob(patchAsJson(p))
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98
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99 def asJsonLd(self):
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100 return graphAsJson(self._graph)
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101
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102 def addObserver(self, onPatch):
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103 self._observers.append(onPatch)
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104
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105 def removeObserver(self, onPatch):
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106 try:
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107 self._observers.remove(onPatch)
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108 except ValueError:
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109 pass
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110
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111
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112 class CycloneGraphHandler(PrettyErrorHandler, cyclone.web.RequestHandler):
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113 def initialize(self, masterGraph):
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114 self.masterGraph = masterGraph
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115
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116 def get(self):
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117 writeGraphResponse(self, self.masterGraph,
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118 self.request.headers.get('accept'))
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119
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120 class CycloneGraphEventsHandler(cyclone.sse.SSEHandler):
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121 """
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122 One session with one client.
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123
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124 returns current graph plus future patches to keep remote version
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125 in sync with ours.
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126
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127 intsead of turning off buffering all over, it may work for this
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128 response to send 'x-accel-buffering: no', per
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129 http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_buffering
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130 """
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131 def __init__(self, application, request, masterGraph):
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132 cyclone.sse.SSEHandler.__init__(self, application, request)
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133 self.masterGraph = masterGraph
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134
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135 def bind(self):
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136 graphJson = self.masterGraph.asJsonLd()
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137 log.debug("send fullGraph event: %s", graphJson)
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138 self.sendEvent(message=graphJson, event='fullGraph')
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139 self.masterGraph.addObserver(self.onPatch)
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140
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141 def onPatch(self, patchJson):
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142 # throttle and combine patches here- ideally we could see how
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143 # long the latency to the client is to make a better rate choice
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144 self.sendEvent(message=patchJson, event='patch')
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145
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146 def unbind(self):
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147 self.masterGraph.removeObserver(self.onPatch)
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148