Mercurial > code > home > repos > light9
annotate bin/rdfdb @ 829:e53e78db7b17
refactor file watching. notice new files and dirs.
Ignore-this: 7f571fd9b309b54cff22b2fee5e68322
| author | Drew Perttula <drewp@bigasterisk.com> |
|---|---|
| date | Tue, 04 Jun 2013 22:46:34 +0000 |
| parents | 05aabe3d7b02 |
| children | 9ba1c866bf4c |
| 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 from light9.rdfdb import syncedgraph |
| 796 | 123 |
| 124 from twisted.internet.inotify import INotify | |
| 125 logging.basicConfig(level=logging.DEBUG) | |
| 126 log = logging.getLogger() | |
| 127 | |
| 128 try: | |
| 129 import sys | |
| 130 sys.path.append("../homeauto/lib") | |
| 131 from cycloneerr import PrettyErrorHandler | |
| 132 except ImportError: | |
| 133 class PrettyErrorHandler(object): | |
| 134 pass | |
| 135 | |
| 136 class Client(object): | |
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137 """ |
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138 one of our syncedgraph clients |
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139 """ |
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140 def __init__(self, updateUri, label, db): |
| 796 | 141 self.db = db |
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142 self.label = label |
| 796 | 143 self.updateUri = updateUri |
| 144 self.sendAll() | |
| 145 | |
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146 def __repr__(self): |
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147 return "<%s client at %s>" % (self.label, self.updateUri) |
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148 |
| 796 | 149 def sendAll(self): |
| 150 """send the client the whole graph contents""" | |
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151 log.info("sending all graphs to %s at %s" % |
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152 (self.label, self.updateUri)) |
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153 self.sendPatch(Patch( |
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154 addQuads=self.db.graph.quads(ALLSTMTS), |
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155 delQuads=[])) |
| 821 | 156 |
| 796 | 157 def sendPatch(self, p): |
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158 return syncedgraph.sendPatch(self.updateUri, p) |
| 796 | 159 |
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160 class WatchedFiles(object): |
| 811 | 161 """ |
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162 find files, notice new files. |
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163 |
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164 This object watches directories. Each GraphFile watches its own file. |
| 811 | 165 """ |
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166 def __init__(self, topDirsToWatch, patch, getSubgraph): |
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167 self.topDirsToWatch = topDirsToWatch |
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168 self.patch, self.getSubgraph = patch, getSubgraph |
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169 |
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170 # files from cwd become uris starting with this. *should* be |
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171 # building uris from the show uri in $LIGHT9_SHOW/URI |
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172 # instead. Who wants to keep their data in the same dir tree |
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173 # as the source code?! |
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174 self.topUri = URIRef("http://light9.bigasterisk.com/") |
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175 |
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176 self.graphFiles = {} # context uri : GraphFile |
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177 |
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178 self.notifier = INotify() |
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179 self.notifier.startReading() |
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180 |
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181 self.findAndLoadFiles() |
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182 |
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183 def findAndLoadFiles(self): |
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184 self.initialLoad = True |
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185 try: |
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186 for topdir in self.topDirsToWatch: |
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187 for dirpath, dirnames, filenames in os.walk(topdir): |
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188 for base in filenames: |
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189 self.watchFile(os.path.join(dirpath, base)) |
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190 self.notifier.watch(FilePath(dirpath), autoAdd=True, |
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191 callbacks=[self.dirChange]) |
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192 finally: |
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193 self.initialLoad = False |
| 821 | 194 |
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195 def dirChange(self, watch, path, mask): |
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196 if mask & IN_CREATE: |
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197 self.watchFile(path.path) |
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198 |
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199 def watchFile(self, inFile): |
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200 if not isinstance(inFile, FilePath): |
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201 inFile = FilePath(inFile) |
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202 if not inFile.isfile(): |
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203 return |
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204 if inFile.splitext()[1] not in ['.n3']: |
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205 return |
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206 ctx = self.uriFromFile(inFile) |
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207 gf = GraphFile(self.notifier, inFile.path, ctx, |
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208 self.patch, self.getSubgraph) |
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209 self.graphFiles[ctx] = gf |
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210 gf.reread() |
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211 |
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212 def dirtyFiles(self, ctxs): |
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213 """mark dirty the files that we watch in these contexts. |
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214 |
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215 the ctx might not be a file that we already read; it might be |
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216 for a new file we have to create, or it might be for a |
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217 transient context that we're not going to save |
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218 |
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219 if it's a ctx with no file, error |
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220 """ |
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221 for ctx in ctxs: |
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222 g = self.getSubgraph(ctx) |
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223 |
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224 if ctx not in self.graphFiles: |
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225 outFile = self.fileForUri(ctx) |
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226 self.graphFiles[ctx] = GraphFile(self.notifier, outFile, ctx, |
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227 self.patch, self.getSubgraph) |
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228 |
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229 self.graphFiles[ctx].dirty(g) |
| 796 | 230 |
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231 def uriFromFile(self, filename): |
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232 if isinstance(filename, FilePath): |
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233 filename = filename.path |
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234 assert filename.endswith('.n3'), filename |
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235 return URIRef(self.topUri + filename[:-len('.n3')]) |
| 821 | 236 |
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237 def fileForUri(self, ctx): |
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238 assert isinstance(ctx, URIRef), ctx |
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239 if not ctx.startswith(self.topUri): |
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240 raise ValueError("don't know what filename to use for %s" % ctx) |
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241 return ctx[len(self.topUri):] + ".n3" |
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242 |
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243 |
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244 class Db(object): |
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245 """ |
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246 the master graph, all the connected clients, all the files we're watching |
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247 """ |
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248 def __init__(self, topDirsToWatch): |
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249 |
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250 self.clients = [] |
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251 self.graph = ConjunctiveGraph() |
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252 |
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253 self.watchedFiles = WatchedFiles(topDirsToWatch, |
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254 self.patch, self.getSubgraph) |
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255 |
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256 self.summarizeToLog() |
| 821 | 257 |
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258 def patch(self, p, dueToFileChange=False): |
| 796 | 259 """ |
| 260 apply this patch to the master graph then notify everyone about it | |
| 811 | 261 |
| 262 dueToFileChange if this is a patch describing an edit we read | |
| 263 *from* the file (such that we shouldn't write it back to the file) | |
| 264 | |
| 265 if p has a senderUpdateUri attribute, we won't send this patch | |
| 266 back to the sender with that updateUri | |
| 796 | 267 """ |
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268 ctx = p.getContext() |
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269 log.info("patching graph %s -%d +%d" % ( |
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270 ctx, len(p.delQuads), len(p.addQuads))) |
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271 |
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272 patchQuads(self.graph, p.delQuads, p.addQuads, perfect=True) |
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273 senderUpdateUri = getattr(p, 'senderUpdateUri', None) |
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274 |
| 796 | 275 for c in self.clients: |
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276 if c.updateUri == senderUpdateUri: |
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277 # this client has self-applied the patch already |
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278 continue |
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279 d = c.sendPatch(p) |
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280 d.addErrback(self.clientErrored, c) |
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281 if not dueToFileChange: |
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282 self.watchedFiles.dirtyFiles([ctx]) |
| 796 | 283 sendToLiveClients(asJson=p.jsonRepr) |
| 284 | |
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285 def clientErrored(self, err, c): |
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286 err.trap(twisted.internet.error.ConnectError) |
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287 log.info("connection error- dropping client %r" % c) |
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288 self.clients.remove(c) |
| 821 | 289 self.sendClientsToAllLivePages() |
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290 |
| 796 | 291 def summarizeToLog(self): |
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292 log.info("contexts in graph (%s total stmts):" % len(self.graph)) |
| 796 | 293 for c in self.graph.contexts(): |
| 294 log.info(" %s: %s statements" % | |
| 295 (c.identifier, len(self.getSubgraph(c.identifier)))) | |
| 296 | |
| 297 def getSubgraph(self, uri): | |
| 811 | 298 """ |
| 299 this is meant to return a live view of the given subgraph, but | |
| 300 if i'm still working around an rdflib bug, it might return a | |
| 301 copy | |
| 302 | |
| 303 and it's returning triples, but I think quads would be better | |
| 304 """ | |
| 796 | 305 # this is returning an empty Graph :( |
| 306 #return self.graph.get_context(uri) | |
| 307 | |
| 308 g = Graph() | |
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309 for s in self.graph.triples(ALLSTMTS, uri): |
| 796 | 310 g.add(s) |
| 311 return g | |
| 821 | 312 |
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313 def addClient(self, updateUri, label): |
| 796 | 314 [self.clients.remove(c) |
| 315 for c in self.clients if c.updateUri == updateUri] | |
| 316 | |
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317 log.info("new client %s at %s" % (label, updateUri)) |
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318 self.clients.append(Client(updateUri, label, self)) |
| 796 | 319 self.sendClientsToAllLivePages() |
| 320 | |
| 321 def sendClientsToAllLivePages(self): | |
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322 sendToLiveClients({"clients":[ |
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323 dict(updateUri=c.updateUri, label=c.label) |
| 821 | 324 for c in self.clients]}) |
| 796 | 325 |
| 326 class GraphResource(PrettyErrorHandler, cyclone.web.RequestHandler): | |
| 327 def get(self): | |
| 821 | 328 self.write(self.settings.db.graph.serialize(format='n3')) |
| 329 | |
| 796 | 330 class Patches(PrettyErrorHandler, cyclone.web.RequestHandler): |
| 331 def __init__(self, *args, **kw): | |
| 332 cyclone.web.RequestHandler.__init__(self, *args, **kw) | |
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333 p = syncedgraph.makePatchEndpointPutMethod(self.settings.db.patch) |
| 796 | 334 self.put = lambda: p(self) |
| 335 | |
| 336 def get(self): | |
| 337 pass | |
| 338 | |
| 339 class GraphClients(PrettyErrorHandler, cyclone.web.RequestHandler): | |
| 340 def get(self): | |
| 341 pass | |
| 821 | 342 |
| 796 | 343 def post(self): |
| 344 upd = self.get_argument("clientUpdate") | |
| 345 try: | |
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346 self.settings.db.addClient(upd, self.get_argument("label")) |
| 796 | 347 except: |
| 348 import traceback | |
| 349 traceback.print_exc() | |
| 350 raise | |
| 351 | |
| 352 liveClients = set() | |
| 353 def sendToLiveClients(d=None, asJson=None): | |
| 354 j = asJson or json.dumps(d) | |
| 355 for c in liveClients: | |
| 356 c.sendMessage(j) | |
| 357 | |
| 358 class Live(cyclone.websocket.WebSocketHandler): | |
| 821 | 359 |
| 796 | 360 def connectionMade(self, *args, **kwargs): |
| 811 | 361 log.info("websocket opened") |
| 796 | 362 liveClients.add(self) |
| 363 self.settings.db.sendClientsToAllLivePages() | |
| 364 | |
| 365 def connectionLost(self, reason): | |
| 811 | 366 log.info("websocket closed") |
| 796 | 367 liveClients.remove(self) |
| 368 | |
| 369 def messageReceived(self, message): | |
| 370 log.info("got message %s" % message) | |
| 371 self.sendMessage(message) | |
| 372 | |
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373 class NoExts(cyclone.web.StaticFileHandler): |
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374 # .xhtml pages can be get() without .xhtml on them |
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375 def get(self, path, *args, **kw): |
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376 if path and '.' not in path: |
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377 path = path + ".xhtml" |
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378 cyclone.web.StaticFileHandler.get(self, path, *args, **kw) |
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379 |
| 796 | 380 if __name__ == "__main__": |
| 381 logging.basicConfig() | |
| 382 log = logging.getLogger() | |
| 383 | |
| 384 parser = optparse.OptionParser() | |
| 385 parser.add_option('--show', | |
| 386 help='show URI, like http://light9.bigasterisk.com/show/dance2008', | |
| 387 default=showconfig.showUri()) | |
| 388 parser.add_option("-v", "--verbose", action="store_true", | |
| 389 help="logging.DEBUG") | |
| 390 (options, args) = parser.parse_args() | |
| 391 | |
| 392 log.setLevel(logging.DEBUG if options.verbose else logging.INFO) | |
| 393 | |
| 394 if not options.show: | |
| 395 raise ValueError("missing --show http://...") | |
| 396 | |
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397 db = Db(topDirsToWatch=['show/dance2013']) |
| 821 | 398 |
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399 from twisted.python import log as twlog |
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400 twlog.startLogging(sys.stdout) |
| 821 | 401 |
| 796 | 402 port = 8051 |
| 403 reactor.listenTCP(port, cyclone.web.Application(handlers=[ | |
| 404 (r'/live', Live), | |
| 405 (r'/graph', GraphResource), | |
| 406 (r'/patches', Patches), | |
| 407 (r'/graphClients', GraphClients), | |
| 408 | |
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409 (r'/(.*)', NoExts, |
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410 {"path" : "light9/rdfdb/web", |
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411 "default_filename" : "index.xhtml"}), |
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412 |
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413 ], debug=True, db=db)) |
| 796 | 414 log.info("serving on %s" % port) |
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415 prof.run(reactor.run, profile=False) |