Mercurial > code > home > repos > light9
annotate bin/rdfdb @ 921:e673bdbe0be9
rdfdb: when a new n3 file shows up, fix its path to be relative again so the uri ends up right
Ignore-this: f226c5edc7f794eaaa0d75515eea19fd
| author | drewp@bigasterisk.com |
|---|---|
| date | Mon, 10 Jun 2013 23:14:21 +0000 |
| parents | 741aa0f9be48 |
| children | dcab422615ca |
| rev | line source |
|---|---|
| 796 | 1 #!bin/python |
| 2 """ | |
| 3 other tools POST themselves to here as subscribers to the graph. They | |
| 811 | 4 are providing a URL we can PUT to with graph updates. |
| 796 | 5 |
| 6 we immediately PUT them back all the contents of the graph as a bunch | |
| 7 of adds. | |
| 8 | |
| 811 | 9 later we PUT them back with patches (del/add lists) when there are |
| 796 | 10 changes. |
| 11 | |
| 12 If we fail to reach a registered caller, we forget about it for future | |
| 811 | 13 calls. We could PUT empty diffs as a heartbeat to notice disappearing |
| 796 | 14 callers faster. |
| 15 | |
| 811 | 16 A caller can submit a patch which we'll persist and broadcast to every |
| 17 other client. | |
| 796 | 18 |
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19 Global data undo should probably happen within this service. Some |
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20 operations should not support undo, such as updating the default |
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21 position of a window. How will we separate those? A blacklist of |
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22 subj+pred pairs that don't save undo? Or just save the updates like |
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23 everything else, but when you press undo, there's a way to tell which |
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24 updates *should* be part of your app's undo system? |
| 796 | 25 |
| 26 Maybe some subgraphs are for transient data (e.g. current timecode, | |
| 27 mouse position in curvecalc) that only some listeners want to hear about. | |
| 28 | |
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29 Deletes are graph-specific, so callers may be surprised to delete a |
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30 stmt from one graph but then find that statement is still true. |
| 796 | 31 |
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32 Alternate plan: would it help to insist that every patch is within |
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33 only one subgraph? I think it's ok for them to span multiple ones. |
| 796 | 34 |
| 35 Inserts can be made on any subgraphs, and each subgraph is saved in | |
| 36 its own file. The file might not be in a format that can express | |
| 37 graphs, so I'm just going to not store the subgraph URI in any file. | |
| 38 | |
| 39 I don't support wildcard deletes, and there are race conditions where a | |
| 40 s-p could end up with unexpected multiple objects. Every client needs | |
| 41 to be ready for this. | |
| 42 | |
| 43 We watch the files and push their own changes back to the clients. | |
| 44 | |
| 45 Persist our client list, to survive restarts. In another rdf file? A | |
| 46 random json one? memcache? Also hold the recent changes. We're not | |
| 47 logging everything forever, though, since the output files and a VCS | |
| 48 shall be used for that | |
| 49 | |
| 50 Bnodes: this rdfdb graph might be able to track bnodes correctly, and | |
| 51 they make for more compact n3 files. I'm not sure if it's going to be | |
| 52 hard to keep the client bnodes in sync though. File rereads would be | |
| 811 | 53 hard, if ever a bnode was used across graphs, so that probably should |
| 796 | 54 not be allowed. |
| 55 | |
| 56 Our API: | |
| 57 | |
| 58 GET / ui | |
| 811 | 59 GET /graph the whole graph, or a query from it (needed? just for ui browsing?) |
| 796 | 60 PUT /patches clients submit changes |
| 61 GET /patches (recent) patches from clients | |
| 62 POST /graphClients clientUpdate={uri} to subscribe | |
| 63 GET /graphClients current clients | |
| 64 | |
| 65 format: | |
| 66 json {"adds" : [[quads]...], | |
| 67 "deletes": [[quads]], | |
| 811 | 68 "senderUpdateUri" : tooluri, |
| 69 "created":tttt // maybe to help resolve some conflicts | |
| 796 | 70 } |
| 71 maybe use some http://json-ld.org/ in there. | |
| 72 | |
| 806 | 73 proposed rule feature: |
| 74 rdfdb should be able to watch a pair of (sourceFile, rulesFile) and | |
| 75 rerun the rules when either one changes. Should the sourceFile be able | |
| 76 to specify its own rules file? That would be easier | |
| 77 configuration. How do edits work? Not allowed? Patch the source only? | |
| 78 Also see the source graph loaded into a different ctx, and you can | |
| 79 edit that one and see the results in the output context? | |
| 80 | |
| 796 | 81 Our web ui: |
| 82 | |
| 811 | 83 sections |
| 84 | |
| 85 registered clients | |
| 796 | 86 |
| 811 | 87 recent patches, each one says what client it came from. You can reverse |
| 88 them here. We should be able to take patches that are close in time | |
| 89 and keep updating the same data (e.g. a stream of changes as the user | |
| 90 drags a slider) and collapse them into a single edit for clarity. | |
| 91 | |
| 92 Ways to display patches, using labels and creator/subj icons | |
| 93 where possible: | |
| 796 | 94 |
| 811 | 95 <creator> set <subj>'s <p> to <o> |
| 96 <creator> changed <subj>'s <pred> from <o1> to <o2> | |
| 97 <creator> added <o> to <s> <p> | |
| 98 | |
| 99 raw messages for debugging this client | |
| 806 | 100 |
| 811 | 101 ctx urls take you to-> |
| 102 files, who's dirty, have we seen external changes, notice big | |
| 103 files that are taking a long time to save | |
| 806 | 104 |
| 811 | 105 graph contents. plain rdf browser like an outliner or |
| 106 something. clicking any resource from the other displays takes you | |
| 107 to this, focused on that resource | |
| 803 | 108 |
| 796 | 109 """ |
| 110 from twisted.internet import reactor | |
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111 import twisted.internet.error |
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112 from twisted.python.filepath import FilePath |
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113 from twisted.internet.inotify import humanReadableMask, IN_CREATE |
| 796 | 114 import sys, optparse, logging, json, os |
| 115 import cyclone.web, cyclone.httpclient, cyclone.websocket | |
| 116 sys.path.append(".") | |
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117 from light9 import networking, showconfig, prof |
| 796 | 118 from rdflib import ConjunctiveGraph, URIRef, Graph |
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119 from light9.rdfdb.graphfile import GraphFile |
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120 from light9.rdfdb.patch import Patch, ALLSTMTS |
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121 from light9.rdfdb.rdflibpatch import patchQuads |
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122 |
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123 from light9.rdfdb.patchsender import sendPatch |
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124 from light9.rdfdb.patchreceiver import makePatchEndpointPutMethod |
| 796 | 125 |
| 126 from twisted.internet.inotify import INotify | |
| 833 | 127 from run_local import log |
| 128 log.setLevel(logging.DEBUG) | |
| 796 | 129 |
| 130 try: | |
| 131 import sys | |
| 132 sys.path.append("../homeauto/lib") | |
| 133 from cycloneerr import PrettyErrorHandler | |
| 134 except ImportError: | |
| 135 class PrettyErrorHandler(object): | |
| 136 pass | |
| 137 | |
| 138 class Client(object): | |
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139 """ |
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140 one of our syncedgraph clients |
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141 """ |
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142 def __init__(self, updateUri, label, db): |
| 796 | 143 self.db = db |
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144 self.label = label |
| 796 | 145 self.updateUri = updateUri |
| 146 self.sendAll() | |
| 147 | |
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148 def __repr__(self): |
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149 return "<%s client at %s>" % (self.label, self.updateUri) |
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150 |
| 796 | 151 def sendAll(self): |
| 152 """send the client the whole graph contents""" | |
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153 log.info("sending all graphs to %s at %s" % |
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154 (self.label, self.updateUri)) |
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155 self.sendPatch(Patch( |
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156 addQuads=self.db.graph.quads(ALLSTMTS), |
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157 delQuads=[])) |
| 821 | 158 |
| 796 | 159 def sendPatch(self, p): |
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160 return sendPatch(self.updateUri, p) |
| 796 | 161 |
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162 class WatchedFiles(object): |
| 811 | 163 """ |
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164 find files, notice new files. |
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165 |
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166 This object watches directories. Each GraphFile watches its own file. |
| 811 | 167 """ |
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168 def __init__(self, topDirsToWatch, patch, getSubgraph): |
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169 self.topDirsToWatch = topDirsToWatch |
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170 self.patch, self.getSubgraph = patch, getSubgraph |
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171 |
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172 # files from cwd become uris starting with this. *should* be |
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173 # building uris from the show uri in $LIGHT9_SHOW/URI |
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174 # instead. Who wants to keep their data in the same dir tree |
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175 # as the source code?! |
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176 self.topUri = URIRef("http://light9.bigasterisk.com/") |
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177 |
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178 self.graphFiles = {} # context uri : GraphFile |
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179 |
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180 self.notifier = INotify() |
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181 self.notifier.startReading() |
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182 |
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183 self.findAndLoadFiles() |
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184 |
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185 def findAndLoadFiles(self): |
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186 self.initialLoad = True |
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187 try: |
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188 for topdir in self.topDirsToWatch: |
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189 for dirpath, dirnames, filenames in os.walk(topdir): |
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190 for base in filenames: |
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191 self.watchFile(os.path.join(dirpath, base)) |
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192 self.notifier.watch(FilePath(dirpath), autoAdd=True, |
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193 callbacks=[self.dirChange]) |
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194 finally: |
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195 self.initialLoad = False |
| 821 | 196 |
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197 def dirChange(self, watch, path, mask): |
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198 if mask & IN_CREATE: |
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199 self.watchFile(path.path) |
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200 |
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201 def watchFile(self, inFile): |
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202 """ |
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203 consider adding a GraphFile to self.graphFiles |
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204 |
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205 inFile needs to be a relative path, not an absolute (e.g. in a |
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206 FilePath) because we use its exact relative form in the |
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207 context URI |
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208 """ |
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209 if not os.path.isfile(inFile): |
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210 return |
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211 if not any(inFile.startswith(prefix) for prefix in self.topDirsToWatch): |
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212 for prefix in self.topDirsToWatch: |
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213 prefixAbs = os.path.abspath(prefix) |
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214 if inFile.startswith(prefixAbs): |
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215 inFile = prefix + inFile[len(prefixAbs):] |
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216 break |
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217 else: |
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218 raise ValueError("can't correct %s to start with one of %s" % |
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219 (inFile, self.topDirsToWatch)) |
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220 if os.path.splitext(inFile)[1] not in ['.n3']: |
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221 return |
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222 |
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223 # an n3 file with rules makes it all the way past this reading |
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224 # and the serialization. Then, on the receiving side, a |
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225 # SyncedGraph calls graphFromNQuad on the incoming data and |
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226 # has a parse error. I'm not sure where this should be fixed |
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227 # yet. |
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228 if '-rules' in inFile: |
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229 return |
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230 |
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231 # for legacy versions, compile all the config stuff you want |
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232 # read into one file called config.n3. New versions won't read |
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233 # it. |
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234 if inFile.endswith("config.n3"): |
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235 return |
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236 |
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237 ctx = self.uriFromFile(inFile) |
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238 gf = GraphFile(self.notifier, inFile, ctx, |
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239 self.patch, self.getSubgraph) |
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240 self.graphFiles[ctx] = gf |
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241 gf.reread() |
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242 |
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243 def dirtyFiles(self, ctxs): |
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244 """mark dirty the files that we watch in these contexts. |
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245 |
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246 the ctx might not be a file that we already read; it might be |
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247 for a new file we have to create, or it might be for a |
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248 transient context that we're not going to save |
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249 |
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250 if it's a ctx with no file, error |
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251 """ |
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252 for ctx in ctxs: |
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253 g = self.getSubgraph(ctx) |
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254 |
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255 if ctx not in self.graphFiles: |
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256 outFile = self.fileForUri(ctx) |
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257 self.graphFiles[ctx] = GraphFile(self.notifier, outFile, ctx, |
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258 self.patch, self.getSubgraph) |
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259 |
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260 self.graphFiles[ctx].dirty(g) |
| 796 | 261 |
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262 def uriFromFile(self, filename): |
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263 assert filename.endswith('.n3'), filename |
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264 if not any(filename.startswith(t) for t in self.topDirsToWatch): |
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265 raise ValueError("filename %s doesn't start with any of %s" % |
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266 (filename, self.topDirsToWatch)) |
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267 return URIRef(self.topUri + filename[:-len('.n3')]) |
| 821 | 268 |
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269 def fileForUri(self, ctx): |
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270 assert isinstance(ctx, URIRef), ctx |
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271 if not ctx.startswith(self.topUri): |
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272 raise ValueError("don't know what filename to use for %s" % ctx) |
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273 return ctx[len(self.topUri):] + ".n3" |
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274 |
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275 |
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276 class Db(object): |
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277 """ |
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278 the master graph, all the connected clients, all the files we're watching |
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279 """ |
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280 def __init__(self, topDirsToWatch): |
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281 |
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282 self.clients = [] |
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283 self.graph = ConjunctiveGraph() |
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284 |
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285 self.watchedFiles = WatchedFiles(topDirsToWatch, |
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286 self.patch, self.getSubgraph) |
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287 |
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288 self.summarizeToLog() |
| 821 | 289 |
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290 def patch(self, p, dueToFileChange=False): |
| 796 | 291 """ |
| 292 apply this patch to the master graph then notify everyone about it | |
| 811 | 293 |
| 294 dueToFileChange if this is a patch describing an edit we read | |
| 295 *from* the file (such that we shouldn't write it back to the file) | |
| 296 | |
| 297 if p has a senderUpdateUri attribute, we won't send this patch | |
| 298 back to the sender with that updateUri | |
| 796 | 299 """ |
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300 ctx = p.getContext() |
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301 log.info("patching graph %s -%d +%d" % ( |
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302 ctx, len(p.delQuads), len(p.addQuads))) |
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303 |
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304 patchQuads(self.graph, p.delQuads, p.addQuads, perfect=True) |
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305 senderUpdateUri = getattr(p, 'senderUpdateUri', None) |
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306 |
| 796 | 307 for c in self.clients: |
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308 if c.updateUri == senderUpdateUri: |
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309 # this client has self-applied the patch already |
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310 continue |
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311 d = c.sendPatch(p) |
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312 d.addErrback(self.clientErrored, c) |
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313 if not dueToFileChange: |
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314 self.watchedFiles.dirtyFiles([ctx]) |
| 796 | 315 sendToLiveClients(asJson=p.jsonRepr) |
| 316 | |
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317 def clientErrored(self, err, c): |
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318 err.trap(twisted.internet.error.ConnectError) |
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319 log.info("connection error- dropping client %r" % c) |
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320 self.clients.remove(c) |
| 821 | 321 self.sendClientsToAllLivePages() |
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322 |
| 796 | 323 def summarizeToLog(self): |
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324 log.info("contexts in graph (%s total stmts):" % len(self.graph)) |
| 796 | 325 for c in self.graph.contexts(): |
| 326 log.info(" %s: %s statements" % | |
| 327 (c.identifier, len(self.getSubgraph(c.identifier)))) | |
| 328 | |
| 329 def getSubgraph(self, uri): | |
| 811 | 330 """ |
| 331 this is meant to return a live view of the given subgraph, but | |
| 332 if i'm still working around an rdflib bug, it might return a | |
| 333 copy | |
| 334 | |
| 335 and it's returning triples, but I think quads would be better | |
| 336 """ | |
| 796 | 337 # this is returning an empty Graph :( |
| 338 #return self.graph.get_context(uri) | |
| 339 | |
| 340 g = Graph() | |
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341 for s in self.graph.triples(ALLSTMTS, uri): |
| 796 | 342 g.add(s) |
| 343 return g | |
| 821 | 344 |
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345 def addClient(self, updateUri, label): |
| 796 | 346 [self.clients.remove(c) |
| 347 for c in self.clients if c.updateUri == updateUri] | |
| 348 | |
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349 log.info("new client %s at %s" % (label, updateUri)) |
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350 self.clients.append(Client(updateUri, label, self)) |
| 796 | 351 self.sendClientsToAllLivePages() |
| 352 | |
| 353 def sendClientsToAllLivePages(self): | |
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354 sendToLiveClients({"clients":[ |
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355 dict(updateUri=c.updateUri, label=c.label) |
| 821 | 356 for c in self.clients]}) |
| 796 | 357 |
| 358 class GraphResource(PrettyErrorHandler, cyclone.web.RequestHandler): | |
| 359 def get(self): | |
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360 accept = self.request.headers.get('accept', '') |
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361 format = 'n3' |
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362 if accept == 'text/plain': |
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363 format = 'nt' |
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364 self.write(self.settings.db.graph.serialize(format=format)) |
| 821 | 365 |
| 796 | 366 class Patches(PrettyErrorHandler, cyclone.web.RequestHandler): |
| 367 def __init__(self, *args, **kw): | |
| 368 cyclone.web.RequestHandler.__init__(self, *args, **kw) | |
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369 p = makePatchEndpointPutMethod(self.settings.db.patch) |
| 796 | 370 self.put = lambda: p(self) |
| 371 | |
| 372 def get(self): | |
| 373 pass | |
| 374 | |
| 375 class GraphClients(PrettyErrorHandler, cyclone.web.RequestHandler): | |
| 376 def get(self): | |
| 377 pass | |
| 821 | 378 |
| 796 | 379 def post(self): |
| 380 upd = self.get_argument("clientUpdate") | |
| 381 try: | |
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382 self.settings.db.addClient(upd, self.get_argument("label")) |
| 796 | 383 except: |
| 384 import traceback | |
| 385 traceback.print_exc() | |
| 386 raise | |
| 387 | |
| 388 liveClients = set() | |
| 389 def sendToLiveClients(d=None, asJson=None): | |
| 390 j = asJson or json.dumps(d) | |
| 391 for c in liveClients: | |
| 392 c.sendMessage(j) | |
| 393 | |
| 394 class Live(cyclone.websocket.WebSocketHandler): | |
| 821 | 395 |
| 796 | 396 def connectionMade(self, *args, **kwargs): |
| 811 | 397 log.info("websocket opened") |
| 796 | 398 liveClients.add(self) |
| 399 self.settings.db.sendClientsToAllLivePages() | |
| 400 | |
| 401 def connectionLost(self, reason): | |
| 811 | 402 log.info("websocket closed") |
| 796 | 403 liveClients.remove(self) |
| 404 | |
| 405 def messageReceived(self, message): | |
| 406 log.info("got message %s" % message) | |
| 407 self.sendMessage(message) | |
| 408 | |
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409 class NoExts(cyclone.web.StaticFileHandler): |
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410 # .xhtml pages can be get() without .xhtml on them |
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411 def get(self, path, *args, **kw): |
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412 if path and '.' not in path: |
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413 path = path + ".xhtml" |
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414 cyclone.web.StaticFileHandler.get(self, path, *args, **kw) |
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415 |
| 796 | 416 if __name__ == "__main__": |
| 417 logging.basicConfig() | |
| 418 log = logging.getLogger() | |
| 419 | |
| 420 parser = optparse.OptionParser() | |
| 421 parser.add_option('--show', | |
| 422 help='show URI, like http://light9.bigasterisk.com/show/dance2008', | |
| 423 default=showconfig.showUri()) | |
| 424 parser.add_option("-v", "--verbose", action="store_true", | |
| 425 help="logging.DEBUG") | |
| 426 (options, args) = parser.parse_args() | |
| 427 | |
| 428 log.setLevel(logging.DEBUG if options.verbose else logging.INFO) | |
| 429 | |
| 430 if not options.show: | |
| 431 raise ValueError("missing --show http://...") | |
| 432 | |
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433 db = Db(topDirsToWatch=['show/dance2013']) |
| 821 | 434 |
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435 from twisted.python import log as twlog |
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436 twlog.startLogging(sys.stdout) |
| 821 | 437 |
| 796 | 438 port = 8051 |
| 439 reactor.listenTCP(port, cyclone.web.Application(handlers=[ | |
| 440 (r'/live', Live), | |
| 441 (r'/graph', GraphResource), | |
| 442 (r'/patches', Patches), | |
| 443 (r'/graphClients', GraphClients), | |
| 444 | |
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445 (r'/(.*)', NoExts, |
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446 {"path" : "light9/rdfdb/web", |
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447 "default_filename" : "index.xhtml"}), |
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448 |
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449 ], debug=True, db=db)) |
| 796 | 450 log.info("serving on %s" % port) |
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451 prof.run(reactor.run, profile=False) |