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| author | Drew Perttula <drewp@bigasterisk.com> |
|---|---|
| date | Sat, 04 Jun 2016 21:23:58 +0000 |
| parents | d5c834766ce9 |
| children | a214a9d6f2f0 |
| rev | line source |
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| 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 from light9.rdfdb.file_vs_uri import correctToTopdirPrefix, fileForUri, uriFromFile |
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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 |
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130 from lib.cycloneerr import PrettyErrorHandler |
| 796 | 131 |
| 132 class Client(object): | |
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133 """ |
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134 one of our syncedgraph clients |
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135 """ |
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136 def __init__(self, updateUri, label, db): |
| 796 | 137 self.db = db |
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138 self.label = label |
| 796 | 139 self.updateUri = updateUri |
| 140 self.sendAll() | |
| 141 | |
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142 def __repr__(self): |
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143 return "<%s client at %s>" % (self.label, self.updateUri) |
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144 |
| 796 | 145 def sendAll(self): |
| 146 """send the client the whole graph contents""" | |
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147 log.info("sending all graphs to %s at %s" % |
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148 (self.label, self.updateUri)) |
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149 self.sendPatch(Patch( |
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150 addQuads=self.db.graph.quads(ALLSTMTS), |
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151 delQuads=[])) |
| 821 | 152 |
| 796 | 153 def sendPatch(self, p): |
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154 return sendPatch(self.updateUri, p) |
| 796 | 155 |
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156 class WatchedFiles(object): |
| 811 | 157 """ |
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158 find files, notice new files. |
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159 |
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160 This object watches directories. Each GraphFile watches its own file. |
| 811 | 161 """ |
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162 def __init__(self, dirUriMap, patch, getSubgraph): |
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163 self.dirUriMap = dirUriMap # {abspath : uri prefix} |
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164 self.patch, self.getSubgraph = patch, getSubgraph |
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165 |
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166 self.graphFiles = {} # context uri : GraphFile |
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167 |
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168 self.notifier = INotify() |
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169 self.notifier.startReading() |
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170 |
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171 self.findAndLoadFiles() |
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172 |
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173 def findAndLoadFiles(self): |
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174 self.initialLoad = True |
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175 try: |
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176 for topdir in self.dirUriMap: |
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177 for dirpath, dirnames, filenames in os.walk(topdir): |
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178 for base in filenames: |
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179 self.watchFile(os.path.join(dirpath, base)) |
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180 self.notifier.watch(FilePath(dirpath), autoAdd=True, |
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181 callbacks=[self.dirChange]) |
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182 finally: |
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183 self.initialLoad = False |
| 821 | 184 |
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185 def dirChange(self, watch, path, mask): |
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186 if mask & IN_CREATE: |
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187 log.debug("%s created; consider adding a watch", path) |
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188 self.watchFile(path.path) |
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189 |
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190 def watchFile(self, inFile): |
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191 """ |
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192 consider adding a GraphFile to self.graphFiles |
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193 |
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194 inFile needs to be a relative path, not an absolute (e.g. in a |
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195 FilePath) because we use its exact relative form in the |
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196 context URI |
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197 """ |
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198 if not os.path.isfile(inFile): |
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199 return |
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200 |
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201 inFile = correctToTopdirPrefix(self.dirUriMap, inFile) |
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202 if os.path.splitext(inFile)[1] not in ['.n3']: |
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203 return |
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204 |
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205 # an n3 file with rules makes it all the way past this reading |
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206 # and the serialization. Then, on the receiving side, a |
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207 # SyncedGraph calls graphFromNQuad on the incoming data and |
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208 # has a parse error. I'm not sure where this should be fixed |
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209 # yet. |
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210 if '-rules' in inFile: |
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211 return |
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212 |
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213 # for legacy versions, compile all the config stuff you want |
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214 # read into one file called config.n3. New versions won't read |
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215 # it. |
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216 if inFile.endswith("config.n3"): |
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217 return |
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218 |
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219 ctx = uriFromFile(self.dirUriMap, inFile) |
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220 gf = GraphFile(self.notifier, inFile, ctx, |
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221 self.patch, self.getSubgraph) |
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222 self.graphFiles[ctx] = gf |
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223 log.info("%s do initial read", inFile) |
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224 gf.reread() |
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225 |
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226 def aboutToPatch(self, ctx): |
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227 """ |
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228 warn us that a patch is about to come to this context. it's more |
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229 straightforward to create the new file now |
| 931 | 230 |
| 231 this is meant to make the file before we add triples, so we | |
| 232 wouldn't see the blank file and lose those triples. But it | |
| 233 didn't work, so there are other measures that make us not lose | |
| 234 the triples from a new file. Calling this before patching the | |
| 235 graph is still a reasonable thing to do, though. | |
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236 """ |
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237 g = self.getSubgraph(ctx) |
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238 |
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239 if ctx not in self.graphFiles: |
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240 outFile = fileForUri(self.dirUriMap, ctx) |
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241 assert '//' not in outFile, (outFile, self.dirUriMap, ctx) |
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242 log.info("starting new file %r", outFile) |
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243 self.graphFiles[ctx] = GraphFile(self.notifier, outFile, ctx, |
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244 self.patch, self.getSubgraph) |
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245 |
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246 def dirtyFiles(self, ctxs): |
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247 """mark dirty the files that we watch in these contexts. |
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248 |
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249 the ctx might not be a file that we already read; it might be |
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250 for a new file we have to create, or it might be for a |
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251 transient context that we're not going to save |
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252 |
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253 if it's a ctx with no file, error |
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254 """ |
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255 for ctx in ctxs: |
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256 g = self.getSubgraph(ctx) |
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257 self.graphFiles[ctx].dirty(g) |
| 796 | 258 |
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259 |
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260 class Db(object): |
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261 """ |
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262 the master graph, all the connected clients, all the files we're watching |
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263 """ |
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264 def __init__(self, dirUriMap): |
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265 |
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266 self.clients = [] |
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267 self.graph = ConjunctiveGraph() |
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268 |
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269 self.watchedFiles = WatchedFiles(dirUriMap, |
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270 self.patch, self.getSubgraph) |
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271 |
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272 self.summarizeToLog() |
| 821 | 273 |
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274 def patch(self, p, dueToFileChange=False): |
| 796 | 275 """ |
| 276 apply this patch to the master graph then notify everyone about it | |
| 811 | 277 |
| 278 dueToFileChange if this is a patch describing an edit we read | |
| 279 *from* the file (such that we shouldn't write it back to the file) | |
| 280 | |
| 281 if p has a senderUpdateUri attribute, we won't send this patch | |
| 282 back to the sender with that updateUri | |
| 796 | 283 """ |
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284 ctx = p.getContext() |
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285 log.info("patching graph %s -%d +%d" % ( |
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286 ctx, len(p.delQuads), len(p.addQuads))) |
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287 |
| 931 | 288 if hasattr(self, 'watchedFiles'): # not available during startup |
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289 self.watchedFiles.aboutToPatch(ctx) |
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290 |
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291 patchQuads(self.graph, p.delQuads, p.addQuads, perfect=True) |
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292 self._sendPatch(p) |
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293 if not dueToFileChange: |
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294 self.watchedFiles.dirtyFiles([ctx]) |
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295 sendToLiveClients(asJson=p.jsonRepr) |
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296 |
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297 def _sendPatch(self, p): |
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298 senderUpdateUri = getattr(p, 'senderUpdateUri', None) |
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299 |
| 796 | 300 for c in self.clients: |
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301 if c.updateUri == senderUpdateUri: |
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302 # this client has self-applied the patch already |
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303 continue |
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304 d = c.sendPatch(p) |
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305 d.addErrback(self.clientErrored, c) |
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306 |
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307 def clientErrored(self, err, c): |
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308 err.trap(twisted.internet.error.ConnectError) |
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309 log.info("connection error- dropping client %r" % c) |
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310 self.clients.remove(c) |
| 821 | 311 self.sendClientsToAllLivePages() |
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312 |
| 796 | 313 def summarizeToLog(self): |
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314 log.info("contexts in graph (%s total stmts):" % len(self.graph)) |
| 796 | 315 for c in self.graph.contexts(): |
| 316 log.info(" %s: %s statements" % | |
| 317 (c.identifier, len(self.getSubgraph(c.identifier)))) | |
| 318 | |
| 319 def getSubgraph(self, uri): | |
| 811 | 320 """ |
| 321 this is meant to return a live view of the given subgraph, but | |
| 322 if i'm still working around an rdflib bug, it might return a | |
| 323 copy | |
| 324 | |
| 325 and it's returning triples, but I think quads would be better | |
| 326 """ | |
| 796 | 327 # this is returning an empty Graph :( |
| 328 #return self.graph.get_context(uri) | |
| 329 | |
| 330 g = Graph() | |
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331 for s in self.graph.triples(ALLSTMTS, uri): |
| 796 | 332 g.add(s) |
| 333 return g | |
| 821 | 334 |
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335 def addClient(self, updateUri, label): |
| 796 | 336 [self.clients.remove(c) |
| 337 for c in self.clients if c.updateUri == updateUri] | |
| 338 | |
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339 log.info("new client %s at %s" % (label, updateUri)) |
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340 self.clients.append(Client(updateUri, label, self)) |
| 796 | 341 self.sendClientsToAllLivePages() |
| 342 | |
| 343 def sendClientsToAllLivePages(self): | |
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344 sendToLiveClients({"clients":[ |
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345 dict(updateUri=c.updateUri, label=c.label) |
| 821 | 346 for c in self.clients]}) |
| 796 | 347 |
| 348 class GraphResource(PrettyErrorHandler, cyclone.web.RequestHandler): | |
| 349 def get(self): | |
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350 accept = self.request.headers.get('accept', '') |
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351 format = 'n3' |
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352 if accept == 'text/plain': |
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353 format = 'nt' |
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354 elif accept == 'application/n-quads': |
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355 format = 'nquads' |
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very simple con-neg on rdfdb /graph to support text/plain (ntriples)
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356 self.write(self.settings.db.graph.serialize(format=format)) |
| 821 | 357 |
| 796 | 358 class Patches(PrettyErrorHandler, cyclone.web.RequestHandler): |
| 359 def __init__(self, *args, **kw): | |
| 360 cyclone.web.RequestHandler.__init__(self, *args, **kw) | |
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843
77b5dbcf688d
split syncedgraph into several layers
drewp@bigasterisk.com
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361 p = makePatchEndpointPutMethod(self.settings.db.patch) |
| 796 | 362 self.put = lambda: p(self) |
| 363 | |
| 364 def get(self): | |
| 365 pass | |
| 366 | |
| 367 class GraphClients(PrettyErrorHandler, cyclone.web.RequestHandler): | |
| 368 def get(self): | |
| 369 pass | |
| 821 | 370 |
| 796 | 371 def post(self): |
| 372 upd = self.get_argument("clientUpdate") | |
| 373 try: | |
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904913de4599
deletes are now quads. refactor files. named clients. auto client port
drewp@bigasterisk.com
parents:
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diff
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374 self.settings.db.addClient(upd, self.get_argument("label")) |
| 796 | 375 except: |
| 376 import traceback | |
| 377 traceback.print_exc() | |
| 378 raise | |
| 379 | |
| 380 liveClients = set() | |
| 381 def sendToLiveClients(d=None, asJson=None): | |
| 382 j = asJson or json.dumps(d) | |
| 383 for c in liveClients: | |
| 384 c.sendMessage(j) | |
| 385 | |
| 386 class Live(cyclone.websocket.WebSocketHandler): | |
| 821 | 387 |
| 796 | 388 def connectionMade(self, *args, **kwargs): |
| 811 | 389 log.info("websocket opened") |
| 796 | 390 liveClients.add(self) |
| 391 self.settings.db.sendClientsToAllLivePages() | |
| 392 | |
| 393 def connectionLost(self, reason): | |
| 811 | 394 log.info("websocket closed") |
| 796 | 395 liveClients.remove(self) |
| 396 | |
| 397 def messageReceived(self, message): | |
| 398 log.info("got message %s" % message) | |
| 399 self.sendMessage(message) | |
| 400 | |
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814
1ae8e6b287e3
improvements to file watching. outline of how resync will work
drewp@bigasterisk.com
parents:
811
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401 class NoExts(cyclone.web.StaticFileHandler): |
| 1309 | 402 # .html pages can be get() without .html on them |
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parents:
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403 def get(self, path, *args, **kw): |
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parents:
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404 if path and '.' not in path: |
| 1309 | 405 path = path + ".html" |
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drewp@bigasterisk.com
parents:
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406 cyclone.web.StaticFileHandler.get(self, path, *args, **kw) |
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407 |
| 796 | 408 if __name__ == "__main__": |
| 409 logging.basicConfig() | |
| 410 log = logging.getLogger() | |
| 411 | |
| 412 parser = optparse.OptionParser() | |
| 413 parser.add_option("-v", "--verbose", action="store_true", | |
| 414 help="logging.DEBUG") | |
| 415 (options, args) = parser.parse_args() | |
| 416 | |
| 417 log.setLevel(logging.DEBUG if options.verbose else logging.INFO) | |
| 418 | |
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1045
c1face79c0e1
fix rdfdb's filename<->uri mapping system
Drew Perttula <drewp@bigasterisk.com>
parents:
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diff
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419 db = Db(dirUriMap={os.environ['LIGHT9_SHOW'].rstrip('/') + '/': |
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1282
2c0c3aec0d63
critical fix- put slash in the uri map prefix so it gets removed from uris, so filenames don't have // in them and fail to compare right to other versions
drewp@bigasterisk.com
parents:
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420 showconfig.showUri() + '/'}) |
| 821 | 421 |
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parents:
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422 from twisted.python import log as twlog |
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423 twlog.startLogging(sys.stdout) |
| 821 | 424 |
|
1225
70f42f9d6e04
simplify homepageConfig. get homepage port from rdf. get rdfdb port from rdf
Drew Perttula <drewp@bigasterisk.com>
parents:
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diff
changeset
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425 reactor.listenTCP(networking.rdfdb.port, cyclone.web.Application(handlers=[ |
| 796 | 426 (r'/live', Live), |
| 427 (r'/graph', GraphResource), | |
| 428 (r'/patches', Patches), | |
| 429 (r'/graphClients', GraphClients), | |
| 430 | |
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431 (r'/(.*)', NoExts, |
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432 {"path" : "light9/rdfdb/web", |
| 1309 | 433 "default_filename" : "index.html"}), |
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434 |
|
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drewp@bigasterisk.com
parents:
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435 ], debug=True, db=db)) |
|
1225
70f42f9d6e04
simplify homepageConfig. get homepage port from rdf. get rdfdb port from rdf
Drew Perttula <drewp@bigasterisk.com>
parents:
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diff
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436 log.info("serving on %s" % networking.rdfdb.port) |
|
1178
a296d842d0da
better cmdline option error
Drew Perttula <drewp@bigasterisk.com>
parents:
1083
diff
changeset
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437 prof.run(reactor.run, profile=None) |