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annotate bin/rdfdb @ 1447:8a9a9b58a4e2
live page now knows that collector needs all settings on each request
Ignore-this: 79ad8d1e001b98b6fce6d14f75f92745
| author | drewp@bigasterisk.com |
|---|---|
| date | Sat, 11 Jun 2016 21:40:37 +0000 |
| parents | 6044e527d795 |
| children | 3ca103d97f98 |
| 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 """ |
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110 from twisted.internet import reactor, defer |
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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.python.failure import Failure |
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114 from twisted.internet.inotify import humanReadableMask, IN_CREATE |
| 796 | 115 import sys, optparse, logging, json, os |
| 116 import cyclone.web, cyclone.httpclient, cyclone.websocket | |
| 117 sys.path.append(".") | |
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118 from light9 import networking, showconfig, prof |
| 796 | 119 from rdflib import ConjunctiveGraph, URIRef, Graph |
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120 from light9.rdfdb.graphfile import GraphFile |
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121 from light9.rdfdb.patch import Patch, ALLSTMTS |
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122 from light9.rdfdb.rdflibpatch import patchQuads |
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123 from light9.rdfdb.file_vs_uri import correctToTopdirPrefix, fileForUri, uriFromFile |
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124 from light9.rdfdb.patchsender import sendPatch |
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125 from light9.rdfdb.patchreceiver import makePatchEndpointPutMethod |
| 796 | 126 |
| 127 from twisted.internet.inotify import INotify | |
| 833 | 128 from run_local import log |
| 129 log.setLevel(logging.DEBUG) | |
| 796 | 130 |
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131 from lib.cycloneerr import PrettyErrorHandler |
| 796 | 132 |
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133 class WebsocketDisconnect(ValueError): |
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134 pass |
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135 |
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136 def sendGraphToClient(graph, client): |
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137 """send the client the whole graph contents""" |
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138 log.info("sending all graphs to %r" % client) |
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139 client.sendPatch(Patch( |
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140 addQuads=graph.quads(ALLSTMTS), |
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141 delQuads=[])) |
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142 |
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143 |
| 796 | 144 class Client(object): |
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145 """ |
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146 one of our syncedgraph clients |
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147 """ |
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148 def __init__(self, updateUri, label): |
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149 self.label = label |
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150 # todo: updateUri is used publicly to compare clients. Replace |
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151 # it with Client.__eq__ so WsClient doesn't have to fake an |
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152 # updateUri. |
| 796 | 153 self.updateUri = updateUri |
| 154 | |
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155 def __repr__(self): |
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156 return "<%s client at %s>" % (self.label, self.updateUri) |
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157 |
| 796 | 158 def sendPatch(self, p): |
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159 """ |
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160 returns deferred. error will be interpreted as the client being |
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161 broken. |
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162 """ |
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163 return sendPatch(self.updateUri, p) |
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164 |
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165 class WsClient(object): |
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166 def __init__(self, connectionId, sendMessage): |
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167 self.updateUri = connectionId |
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168 self.sendMessage = sendMessage |
| 796 | 169 |
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170 def __repr__(self): |
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171 return "<WsClient %s>" % self.updateUri |
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172 |
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173 def sendPatch(self, p): |
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174 self.sendMessage(p.makeJsonRepr()) |
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175 return defer.succeed(None) |
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176 |
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177 class WatchedFiles(object): |
| 811 | 178 """ |
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179 find files, notice new files. |
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180 |
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181 This object watches directories. Each GraphFile watches its own file. |
| 811 | 182 """ |
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183 def __init__(self, dirUriMap, patch, getSubgraph): |
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184 self.dirUriMap = dirUriMap # {abspath : uri prefix} |
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185 self.patch, self.getSubgraph = patch, getSubgraph |
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186 |
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187 self.graphFiles = {} # context uri : GraphFile |
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188 |
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189 self.notifier = INotify() |
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190 self.notifier.startReading() |
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191 |
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192 self.findAndLoadFiles() |
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193 |
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194 def findAndLoadFiles(self): |
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195 self.initialLoad = True |
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196 try: |
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197 for topdir in self.dirUriMap: |
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198 for dirpath, dirnames, filenames in os.walk(topdir): |
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199 for base in filenames: |
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200 self.watchFile(os.path.join(dirpath, base)) |
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201 self.notifier.watch(FilePath(dirpath), autoAdd=True, |
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202 callbacks=[self.dirChange]) |
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203 finally: |
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204 self.initialLoad = False |
| 821 | 205 |
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206 def dirChange(self, watch, path, mask): |
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207 if mask & IN_CREATE: |
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208 log.debug("%s created; consider adding a watch", path) |
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209 self.watchFile(path.path) |
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210 |
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211 def watchFile(self, inFile): |
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212 """ |
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213 consider adding a GraphFile to self.graphFiles |
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214 |
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215 inFile needs to be a relative path, not an absolute (e.g. in a |
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216 FilePath) because we use its exact relative form in the |
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217 context URI |
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218 """ |
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219 if not os.path.isfile(inFile): |
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220 return |
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221 |
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222 inFile = correctToTopdirPrefix(self.dirUriMap, inFile) |
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223 if os.path.splitext(inFile)[1] not in ['.n3']: |
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224 return |
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225 |
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226 # an n3 file with rules makes it all the way past this reading |
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227 # and the serialization. Then, on the receiving side, a |
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228 # SyncedGraph calls graphFromNQuad on the incoming data and |
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229 # has a parse error. I'm not sure where this should be fixed |
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230 # yet. |
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231 if '-rules' in inFile: |
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232 return |
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233 |
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234 # for legacy versions, compile all the config stuff you want |
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235 # read into one file called config.n3. New versions won't read |
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236 # it. |
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237 if inFile.endswith("config.n3"): |
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238 return |
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239 |
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240 ctx = uriFromFile(self.dirUriMap, inFile) |
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241 gf = GraphFile(self.notifier, inFile, ctx, |
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242 self.patch, self.getSubgraph) |
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243 self.graphFiles[ctx] = gf |
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244 log.info("%s do initial read", inFile) |
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245 gf.reread() |
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246 |
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247 def aboutToPatch(self, ctx): |
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248 """ |
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249 warn us that a patch is about to come to this context. it's more |
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250 straightforward to create the new file now |
| 931 | 251 |
| 252 this is meant to make the file before we add triples, so we | |
| 253 wouldn't see the blank file and lose those triples. But it | |
| 254 didn't work, so there are other measures that make us not lose | |
| 255 the triples from a new file. Calling this before patching the | |
| 256 graph is still a reasonable thing to do, though. | |
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257 """ |
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258 g = self.getSubgraph(ctx) |
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259 |
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260 if ctx not in self.graphFiles: |
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261 outFile = fileForUri(self.dirUriMap, ctx) |
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262 assert '//' not in outFile, (outFile, self.dirUriMap, ctx) |
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263 log.info("starting new file %r", outFile) |
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264 self.graphFiles[ctx] = GraphFile(self.notifier, outFile, ctx, |
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265 self.patch, self.getSubgraph) |
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266 |
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267 def dirtyFiles(self, ctxs): |
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268 """mark dirty the files that we watch in these contexts. |
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269 |
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270 the ctx might not be a file that we already read; it might be |
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271 for a new file we have to create, or it might be for a |
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272 transient context that we're not going to save |
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273 |
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274 if it's a ctx with no file, error |
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275 """ |
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276 for ctx in ctxs: |
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277 g = self.getSubgraph(ctx) |
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278 self.graphFiles[ctx].dirty(g) |
| 796 | 279 |
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280 |
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281 class Db(object): |
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282 """ |
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283 the master graph, all the connected clients, all the files we're watching |
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284 """ |
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285 def __init__(self, dirUriMap): |
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286 |
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287 self.clients = [] |
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288 self.graph = ConjunctiveGraph() |
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289 |
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290 self.watchedFiles = WatchedFiles(dirUriMap, |
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291 self.patch, self.getSubgraph) |
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292 |
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293 self.summarizeToLog() |
| 821 | 294 |
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295 def patch(self, p, dueToFileChange=False): |
| 796 | 296 """ |
| 297 apply this patch to the master graph then notify everyone about it | |
| 811 | 298 |
| 299 dueToFileChange if this is a patch describing an edit we read | |
| 300 *from* the file (such that we shouldn't write it back to the file) | |
| 301 | |
| 302 if p has a senderUpdateUri attribute, we won't send this patch | |
| 303 back to the sender with that updateUri | |
| 796 | 304 """ |
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305 ctx = p.getContext() |
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306 log.info("patching graph %s -%d +%d" % ( |
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307 ctx, len(p.delQuads), len(p.addQuads))) |
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308 |
| 931 | 309 if hasattr(self, 'watchedFiles'): # not available during startup |
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310 self.watchedFiles.aboutToPatch(ctx) |
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311 |
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312 patchQuads(self.graph, p.delQuads, p.addQuads, perfect=True) |
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313 self._sendPatch(p) |
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314 if not dueToFileChange: |
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315 self.watchedFiles.dirtyFiles([ctx]) |
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316 sendToLiveClients(asJson=p.jsonRepr) |
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317 |
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318 def _sendPatch(self, p): |
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319 senderUpdateUri = getattr(p, 'senderUpdateUri', None) |
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320 |
| 796 | 321 for c in self.clients: |
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322 if c.updateUri == senderUpdateUri: |
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323 # this client has self-applied the patch already |
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324 continue |
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325 d = c.sendPatch(p) |
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326 d.addErrback(self.clientErrored, c) |
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327 |
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328 def clientErrored(self, err, c): |
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329 err.trap(twisted.internet.error.ConnectError, WebsocketDisconnect) |
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330 log.info("%r %r - dropping client", c, err.getErrorMessage()) |
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331 self.clients.remove(c) |
| 821 | 332 self.sendClientsToAllLivePages() |
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333 |
| 796 | 334 def summarizeToLog(self): |
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335 log.info("contexts in graph (%s total stmts):" % len(self.graph)) |
| 796 | 336 for c in self.graph.contexts(): |
| 337 log.info(" %s: %s statements" % | |
| 338 (c.identifier, len(self.getSubgraph(c.identifier)))) | |
| 339 | |
| 340 def getSubgraph(self, uri): | |
| 811 | 341 """ |
| 342 this is meant to return a live view of the given subgraph, but | |
| 343 if i'm still working around an rdflib bug, it might return a | |
| 344 copy | |
| 345 | |
| 346 and it's returning triples, but I think quads would be better | |
| 347 """ | |
| 796 | 348 # this is returning an empty Graph :( |
| 349 #return self.graph.get_context(uri) | |
| 350 | |
| 351 g = Graph() | |
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352 for s in self.graph.triples(ALLSTMTS, uri): |
| 796 | 353 g.add(s) |
| 354 return g | |
| 821 | 355 |
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356 def addClient(self, newClient): |
| 796 | 357 [self.clients.remove(c) |
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358 for c in self.clients if c.updateUri == newClient.updateUri] |
| 796 | 359 |
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360 log.info("new client %r" % newClient) |
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361 sendGraphToClient(self.graph, newClient) |
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362 self.clients.append(newClient) |
| 796 | 363 self.sendClientsToAllLivePages() |
| 364 | |
| 365 def sendClientsToAllLivePages(self): | |
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366 sendToLiveClients({"clients":[ |
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367 dict(updateUri=c.updateUri, label=repr(c)) |
| 821 | 368 for c in self.clients]}) |
| 796 | 369 |
| 370 class GraphResource(PrettyErrorHandler, cyclone.web.RequestHandler): | |
| 371 def get(self): | |
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372 accept = self.request.headers.get('accept', '') |
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373 format = 'n3' |
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374 if accept == 'text/plain': |
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375 format = 'nt' |
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376 elif accept == 'application/n-quads': |
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377 format = 'nquads' |
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378 self.write(self.settings.db.graph.serialize(format=format)) |
| 821 | 379 |
| 796 | 380 class Patches(PrettyErrorHandler, cyclone.web.RequestHandler): |
| 381 def __init__(self, *args, **kw): | |
| 382 cyclone.web.RequestHandler.__init__(self, *args, **kw) | |
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383 p = makePatchEndpointPutMethod(self.settings.db.patch) |
| 796 | 384 self.put = lambda: p(self) |
| 385 | |
| 386 def get(self): | |
| 387 pass | |
| 388 | |
| 389 class GraphClients(PrettyErrorHandler, cyclone.web.RequestHandler): | |
| 390 def get(self): | |
| 391 pass | |
| 821 | 392 |
| 796 | 393 def post(self): |
| 394 upd = self.get_argument("clientUpdate") | |
| 395 try: | |
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396 self.settings.db.addClient(Client(upd, self.get_argument("label"))) |
| 796 | 397 except: |
| 398 import traceback | |
| 399 traceback.print_exc() | |
| 400 raise | |
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401 |
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402 _wsClientSerial = 0 |
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403 class WebsocketClient(cyclone.websocket.WebSocketHandler): |
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404 |
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405 def connectionMade(self, *args, **kwargs): |
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406 global _wsClientSerial |
| 1348 | 407 connectionId = 'connection-%s' % _wsClientSerial |
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408 _wsClientSerial += 1 |
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409 |
| 1348 | 410 self.wsClient = WsClient(connectionId, self.sendMessage) |
| 411 log.info("new ws client %r", self.wsClient) | |
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412 self.settings.db.addClient(self.wsClient) |
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413 |
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414 def connectionLost(self, reason): |
| 1348 | 415 log.info("bye ws client %r", self.wsClient) |
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416 self.settings.db.clientErrored( |
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417 Failure(WebsocketDisconnect(reason)), self.wsClient) |
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418 |
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419 def messageReceived(self, message): |
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420 if message == 'PING': |
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421 self.sendMessage('PONG') |
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422 return |
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423 log.info("got message from %r: %s", self.wsClient, message) |
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424 p = Patch(jsonRepr=message) |
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425 p.senderUpdateUri = self.wsClient.updateUri |
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426 self.settings.db.patch(p) |
| 796 | 427 |
| 428 liveClients = set() | |
| 429 def sendToLiveClients(d=None, asJson=None): | |
| 430 j = asJson or json.dumps(d) | |
| 431 for c in liveClients: | |
| 432 c.sendMessage(j) | |
| 433 | |
| 434 class Live(cyclone.websocket.WebSocketHandler): | |
| 821 | 435 |
| 796 | 436 def connectionMade(self, *args, **kwargs): |
| 811 | 437 log.info("websocket opened") |
| 796 | 438 liveClients.add(self) |
| 439 self.settings.db.sendClientsToAllLivePages() | |
| 440 | |
| 441 def connectionLost(self, reason): | |
| 811 | 442 log.info("websocket closed") |
| 796 | 443 liveClients.remove(self) |
| 444 | |
| 445 def messageReceived(self, message): | |
| 446 log.info("got message %s" % message) | |
| 447 self.sendMessage(message) | |
| 448 | |
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449 class NoExts(cyclone.web.StaticFileHandler): |
| 1309 | 450 # .html pages can be get() without .html on them |
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451 def get(self, path, *args, **kw): |
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452 if path and '.' not in path: |
| 1309 | 453 path = path + ".html" |
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454 cyclone.web.StaticFileHandler.get(self, path, *args, **kw) |
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455 |
| 796 | 456 if __name__ == "__main__": |
| 457 logging.basicConfig() | |
| 458 log = logging.getLogger() | |
| 459 | |
| 460 parser = optparse.OptionParser() | |
| 461 parser.add_option("-v", "--verbose", action="store_true", | |
| 462 help="logging.DEBUG") | |
| 463 (options, args) = parser.parse_args() | |
| 464 | |
| 465 log.setLevel(logging.DEBUG if options.verbose else logging.INFO) | |
| 466 | |
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467 db = Db(dirUriMap={os.environ['LIGHT9_SHOW'].rstrip('/') + '/': |
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468 showconfig.showUri() + '/'}) |
| 821 | 469 |
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470 from twisted.python import log as twlog |
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471 twlog.startLogging(sys.stdout) |
| 821 | 472 |
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473 reactor.listenTCP(networking.rdfdb.port, cyclone.web.Application(handlers=[ |
| 796 | 474 (r'/live', Live), |
| 475 (r'/graph', GraphResource), | |
| 476 (r'/patches', Patches), | |
| 477 (r'/graphClients', GraphClients), | |
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478 (r'/syncedGraph', WebsocketClient), |
| 796 | 479 |
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480 (r'/(.*)', NoExts, |
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481 {"path" : "light9/rdfdb/web", |
| 1309 | 482 "default_filename" : "index.html"}), |
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483 |
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484 ], debug=True, db=db)) |
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485 log.info("serving on %s" % networking.rdfdb.port) |
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486 prof.run(reactor.run, profile=None) |