Dolda2000 GitWeb / pdm.git / blame
| Commit | Line | Data |
|---|---|---|
| 7f97a47e FT |
1 | """Management for daemon processes |
| 2 | ||
| 3 | This module contains a utility to listen for management commands on a | |
| 4 | socket, lending itself to managing daemon processes. | |
| 5 | """ | |
| 6 | ||
| 7 | import os, sys, socket, threading, grp, select | |
| 8 | import types, pprint, traceback | |
| 9 | import pickle, struct | |
| 10 | ||
| 11 | __all__ = ["listener", "unixlistener", "tcplistener", "listen"] | |
| 12 | ||
| 13 | protocols = {} | |
| 14 | ||
| 15 | class repl(object): | |
| 16 | def __init__(self, cl): | |
| 17 | self.cl = cl | |
| 18 | self.mod = types.ModuleType("repl") | |
| 19 | self.mod.echo = self.echo | |
| 20 | self.printer = pprint.PrettyPrinter(indent = 4, depth = 6) | |
| 21 | cl.send("+REPL\n") | |
| 22 | ||
| 23 | def sendlines(self, text): | |
| 24 | for line in text.split("\n"): | |
| 25 | self.cl.send(" " + line + "\n") | |
| 26 | ||
| 27 | def echo(self, ob): | |
| 28 | self.sendlines(self.printer.pformat(ob)) | |
| 29 | ||
| 30 | def command(self, cmd): | |
| 31 | try: | |
| 32 | try: | |
| 33 | ccode = compile(cmd, "PDM Input", "eval") | |
| 34 | except SyntaxError: | |
| 35 | ccode = compile(cmd, "PDM Input", "exec") | |
| 36 | exec ccode in self.mod.__dict__ | |
| 37 | self.cl.send("+OK\n") | |
| 38 | else: | |
| 39 | self.echo(eval(ccode, self.mod.__dict__)) | |
| 40 | self.cl.send("+OK\n") | |
| 41 | except: | |
| 42 | for line in traceback.format_exception(*sys.exc_info()): | |
| 43 | self.cl.send(" " + line) | |
| 44 | self.cl.send("+EXC\n") | |
| 45 | ||
| 46 | def handle(self, buf): | |
| 47 | p = buf.find("\n\n") | |
| 48 | if p < 0: | |
| 49 | return buf | |
| 50 | cmd = buf[:p + 1] | |
| 51 | self.command(cmd) | |
| 52 | return buf[p + 2:] | |
| 53 | protocols["repl"] = repl | |
| 54 | ||
| 55 | class perf(object): | |
| 56 | def __init__(self, cl): | |
| 57 | self.cl = cl | |
| 58 | self.odtab = {} | |
| 59 | cl.send("+PERF1\n") | |
| 60 | self.buf = "" | |
| 61 | self.lock = threading.Lock() | |
| 62 | self.subscribed = {} | |
| 63 | ||
| 64 | def closed(self): | |
| 65 | for id, recv in self.subscribed.iteritems(): | |
| 66 | ob = self.odtab[id] | |
| 67 | if ob is None: continue | |
| 68 | ob, protos = ob | |
| 69 | try: | |
| 70 | ob.unsubscribe(recv) | |
| 71 | except: pass | |
| 72 | ||
| 73 | def send(self, *args): | |
| 74 | self.lock.acquire() | |
| 75 | try: | |
| 76 | buf = pickle.dumps(args) | |
| 77 | buf = struct.pack(">l", len(buf)) + buf | |
| 78 | self.cl.send(buf) | |
| 79 | finally: | |
| 80 | self.lock.release() | |
| 81 | ||
| 82 | def bindob(self, id, ob): | |
| 83 | if not hasattr(ob, "pdm_protocols"): | |
| 84 | raise ValueError("Object does not support PDM introspection") | |
| 85 | try: | |
| 86 | proto = ob.pdm_protocols() | |
| 87 | except Exception, exc: | |
| 88 | raise ValueError("PDM introspection failed", exc) | |
| 89 | self.odtab[id] = ob, proto | |
| 90 | return proto | |
| 91 | ||
| 92 | def bind(self, id, module, obnm): | |
| 93 | resmod = sys.modules.get(module) | |
| 94 | if resmod is None: | |
| 95 | self.send("-", ImportError("No such module: %s" % module)) | |
| 96 | return | |
| 97 | try: | |
| 98 | ob = getattr(resmod, obnm) | |
| 99 | except AttributeError: | |
| 100 | self.send("-", AttributeError("No such object: %s" % obnm)) | |
| 101 | return | |
| 102 | try: | |
| 103 | proto = self.bindob(id, ob) | |
| 104 | except Exception, exc: | |
| 105 | self.send("-", exc) | |
| 106 | return | |
| 107 | self.send("+", proto) | |
| 108 | ||
| 109 | def getob(self, id, proto): | |
| 110 | ob = self.odtab.get(id) | |
| 111 | if ob is None: | |
| 112 | self.send("-", ValueError("No such bound ID: %r" % id)) | |
| 113 | return None | |
| 114 | ob, protos = ob | |
| 115 | if proto not in protos: | |
| 116 | self.send("-", ValueError("Object does not support that protocol")) | |
| 117 | return None | |
| 118 | return ob | |
| 119 | ||
| 120 | def lookup(self, tgtid, srcid, obnm): | |
| 121 | src = self.getob(srcid, "dir") | |
| 122 | if src is None: | |
| 123 | return | |
| 124 | try: | |
| 125 | ob = src.lookup(obnm) | |
| 126 | except KeyError, exc: | |
| 127 | self.send("-", exc) | |
| 128 | return | |
| 129 | try: | |
| 130 | proto = self.bindob(tgtid, ob) | |
| 131 | except Exception, exc: | |
| 132 | self.send("-", exc) | |
| 133 | return | |
| 134 | self.send("+", proto) | |
| 135 | ||
| 136 | def unbind(self, id): | |
| 137 | ob = self.odtab.get(id) | |
| 138 | if ob is None: | |
| 139 | self.send("-", KeyError("No such name bound: %r" % id)) | |
| 140 | return | |
| 141 | ob, protos = ob | |
| 142 | del self.odtab[id] | |
| 143 | recv = self.subscribed.get(id) | |
| 144 | if recv is not None: | |
| 145 | ob.unsubscribe(recv) | |
| 146 | del self.subscribed[id] | |
| 147 | self.send("+") | |
| 148 | ||
| 149 | def listdir(self, id): | |
| 150 | ob = self.getob(id, "dir") | |
| 151 | if ob is None: | |
| 152 | return | |
| 153 | self.send("+", ob.listdir()) | |
| 154 | ||
| 155 | def readattr(self, id): | |
| 156 | ob = self.getob(id, "attr") | |
| 157 | if ob is None: | |
| 158 | return | |
| 159 | try: | |
| 160 | ret = ob.readattr() | |
| 161 | except Exception, exc: | |
| 162 | self.send("-", Exception("Could not read attribute")) | |
| 163 | return | |
| 164 | self.send("+", ret) | |
| 165 | ||
| 166 | def attrinfo(self, id): | |
| 167 | ob = self.getob(id, "attr") | |
| 168 | if ob is None: | |
| 169 | return | |
| 170 | self.send("+", ob.attrinfo()) | |
| 171 | ||
| 172 | def invoke(self, id, method, args, kwargs): | |
| 173 | ob = self.getob(id, "invoke") | |
| 174 | if ob is None: | |
| 175 | return | |
| 176 | try: | |
| 177 | self.send("+", ob.invoke(method, *args, **kwargs)) | |
| 178 | except Exception, exc: | |
| 179 | self.send("-", exc) | |
| 180 | ||
| 181 | def event(self, id, ob, ev): | |
| 182 | self.send("*", id, ev) | |
| 183 | ||
| 184 | def subscribe(self, id): | |
| 185 | ob = self.getob(id, "event") | |
| 186 | if ob is None: | |
| 187 | return | |
| 188 | if id in self.subscribed: | |
| 189 | self.send("-", ValueError("Already subscribed")) | |
| 190 | def recv(ev): | |
| 191 | self.event(id, ob, ev) | |
| 192 | ob.subscribe(recv) | |
| 193 | self.subscribed[id] = recv | |
| 194 | self.send("+") | |
| 195 | ||
| 196 | def unsubscribe(self, id): | |
| 197 | ob = self.getob(id, "event") | |
| 198 | if ob is None: | |
| 199 | return | |
| 200 | recv = self.subscribed.get(id) | |
| 201 | if recv is None: | |
| 202 | self.send("-", ValueError("Not subscribed")) | |
| 203 | ob.unsubscribe(recv) | |
| 204 | del self.subscribed[id] | |
| 205 | self.send("+") | |
| 206 | ||
| 207 | def command(self, data): | |
| 208 | cmd = data[0] | |
| 209 | if cmd == "bind": | |
| 210 | self.bind(*data[1:]) | |
| 211 | elif cmd == "unbind": | |
| 212 | self.unbind(*data[1:]) | |
| 213 | elif cmd == "lookup": | |
| 214 | self.lookup(*data[1:]) | |
| 215 | elif cmd == "ls": | |
| 216 | self.listdir(*data[1:]) | |
| 217 | elif cmd == "readattr": | |
| 218 | self.readattr(*data[1:]) | |
| 219 | elif cmd == "attrinfo": | |
| 220 | self.attrinfo(*data[1:]) | |
| 221 | elif cmd == "invoke": | |
| 222 | self.invoke(*data[1:]) | |
| 223 | elif cmd == "subs": | |
| 224 | self.subscribe(*data[1:]) | |
| 225 | elif cmd == "unsubs": | |
| 226 | self.unsubscribe(*data[1:]) | |
| 227 | else: | |
| 228 | self.send("-", Exception("Unknown command: %r" % (cmd,))) | |
| 229 | ||
| 230 | def handle(self, buf): | |
| 231 | if len(buf) < 4: | |
| 232 | return buf | |
| 233 | dlen = struct.unpack(">l", buf[:4])[0] | |
| 234 | if len(buf) < dlen + 4: | |
| 235 | return buf | |
| 236 | data = pickle.loads(buf[4:dlen + 4]) | |
| 237 | self.command(data) | |
| 238 | return buf[dlen + 4:] | |
| 239 | ||
| 240 | protocols["perf"] = perf | |
| 241 | ||
| 242 | class client(threading.Thread): | |
| 243 | def __init__(self, sk): | |
| 244 | super(client, self).__init__(name = "Management client") | |
| 245 | self.setDaemon(True) | |
| 246 | self.sk = sk | |
| 247 | self.handler = self | |
| 248 | ||
| 249 | def send(self, data): | |
| 250 | return self.sk.send(data) | |
| 251 | ||
| 252 | def choose(self, proto): | |
| 253 | if proto in protocols: | |
| 254 | self.handler = protocols[proto](self) | |
| 255 | else: | |
| 256 | self.send("-ERR Unknown protocol: %s\n" % proto) | |
| 257 | raise Exception() | |
| 258 | ||
| 259 | def handle(self, buf): | |
| 260 | p = buf.find("\n") | |
| 261 | if p >= 0: | |
| 262 | proto = buf[:p] | |
| 263 | buf = buf[p + 1:] | |
| 264 | self.choose(proto) | |
| 265 | return buf | |
| 266 | ||
| 267 | def run(self): | |
| 268 | try: | |
| 269 | buf = "" | |
| 270 | self.send("+PDM1\n") | |
| 271 | while True: | |
| 272 | ret = self.sk.recv(1024) | |
| 273 | if ret == "": | |
| 274 | return | |
| 275 | buf += ret | |
| 276 | while True: | |
| 277 | try: | |
| 278 | nbuf = self.handler.handle(buf) | |
| 279 | except: | |
| 280 | return | |
| 281 | if nbuf == buf: | |
| 282 | break | |
| 283 | buf = nbuf | |
| 284 | finally: | |
| 285 | #for line in traceback.format_exception(*sys.exc_info()): | |
| 286 | # print line | |
| 287 | try: | |
| 288 | self.sk.close() | |
| 289 | finally: | |
| 290 | if hasattr(self.handler, "closed"): | |
| 291 | self.handler.closed() | |
| 292 | ||
| 293 | ||
| 294 | class listener(threading.Thread): | |
| 295 | def __init__(self): | |
| 296 | super(listener, self).__init__(name = "Management listener") | |
| 297 | self.setDaemon(True) | |
| 298 | ||
| 299 | def listen(self, sk): | |
| 300 | self.running = True | |
| 301 | while self.running: | |
| 302 | rfd, wfd, efd = select.select([sk], [], [sk], 1) | |
| 303 | for fd in rfd: | |
| 304 | if fd == sk: | |
| 305 | nsk, addr = sk.accept() | |
| 306 | self.accept(nsk, addr) | |
| 307 | ||
| 308 | def stop(self): | |
| 309 | self.running = False | |
| 310 | self.join() | |
| 311 | ||
| 312 | def accept(self, sk, addr): | |
| 313 | cl = client(sk) | |
| 314 | cl.start() | |
| 315 | ||
| 316 | class unixlistener(listener): | |
| 317 | def __init__(self, name, mode = 0600, group = None): | |
| 318 | super(unixlistener, self).__init__() | |
| 319 | self.name = name | |
| 320 | self.mode = mode | |
| 321 | self.group = group | |
| 322 | ||
| 323 | def run(self): | |
| 324 | sk = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) | |
| 325 | ul = False | |
| 326 | try: | |
| 327 | if os.path.exists(self.name) and os.path.stat.S_ISSOCK(os.stat(self.name).st_mode): | |
| 328 | os.unlink(self.name) | |
| 329 | sk.bind(self.name) | |
| 330 | ul = True | |
| 331 | os.chmod(self.name, self.mode) | |
| 332 | if self.group is not None: | |
| 333 | os.chown(self.name, os.getuid(), grp.getgrnam(self.group).gr_gid) | |
| 334 | sk.listen(16) | |
| 335 | self.listen(sk) | |
| 336 | finally: | |
| 337 | sk.close() | |
| 338 | if ul: | |
| 339 | os.unlink(self.name) | |
| 340 | ||
| 341 | class tcplistener(listener): | |
| 342 | def __init__(self, port, bindaddr = "127.0.0.1"): | |
| 343 | super(tcplistener, self).__init__() | |
| 344 | self.port = port | |
| 345 | self.bindaddr = bindaddr | |
| 346 | ||
| 347 | def run(self): | |
| 348 | sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
| 349 | try: | |
| 350 | sk.bind((self.bindaddr, self.port)) | |
| 351 | sk.listen(16) | |
| 352 | self.listen(sk) | |
| 353 | finally: | |
| 354 | sk.close() | |
| 355 | ||
| 356 | def listen(spec): | |
| 357 | if ":" in spec: | |
| 358 | first = spec[:spec.index(":")] | |
| 359 | last = spec[spec.rindex(":") + 1:] | |
| 360 | else: | |
| 361 | first = spec | |
| 362 | last = spec | |
| 363 | if "/" in first: | |
| 364 | parts = spec.split(":") | |
| 365 | mode = 0600 | |
| 366 | group = None | |
| 367 | if len(parts) > 1: | |
| cfc372bf | 368 | mode = int(parts[1], 8) |
| 7f97a47e FT |
369 | if len(parts) > 2: |
| 370 | group = parts[2] | |
| 371 | ret = unixlistener(parts[0], mode = mode, group = group) | |
| 372 | ret.start() | |
| 373 | return ret | |
| 374 | if last.isdigit(): | |
| 375 | p = spec.rindex(":") | |
| 376 | host = spec[:p] | |
| 377 | port = int(spec[p + 1:]) | |
| 378 | ret = tcplistener(port, bindaddr = host) | |
| 379 | ret.start() | |
| 380 | return ret | |
| 381 | raise ValueError("Unparsable listener specification: %r" % spec) | |
| 382 | ||
| 383 | import pdm.perf |