| 1 | import sys, os, threading, time, logging, select, queue |
| 2 | from . import perf |
| 3 | |
| 4 | log = logging.getLogger("ashd.serve") |
| 5 | seq = 1 |
| 6 | seqlk = threading.Lock() |
| 7 | |
| 8 | def reqseq(): |
| 9 | global seq |
| 10 | with seqlk: |
| 11 | s = seq |
| 12 | seq += 1 |
| 13 | return s |
| 14 | |
| 15 | class closed(IOError): |
| 16 | def __init__(self): |
| 17 | super().__init__("The client has closed the connection.") |
| 18 | |
| 19 | class reqthread(threading.Thread): |
| 20 | def __init__(self, *, name=None, **kw): |
| 21 | if name is None: |
| 22 | name = "Request handler %i" % reqseq() |
| 23 | super().__init__(name=name, **kw) |
| 24 | |
| 25 | class wsgirequest(object): |
| 26 | def __init__(self, *, handler): |
| 27 | self.status = None |
| 28 | self.headers = [] |
| 29 | self.respsent = False |
| 30 | self.handler = handler |
| 31 | self.buffer = bytearray() |
| 32 | |
| 33 | def handlewsgi(self): |
| 34 | raise Exception() |
| 35 | def fileno(self): |
| 36 | raise Exception() |
| 37 | def writehead(self, status, headers): |
| 38 | raise Exception() |
| 39 | def flush(self): |
| 40 | raise Exception() |
| 41 | def close(self): |
| 42 | pass |
| 43 | def writedata(self, data): |
| 44 | self.buffer.extend(data) |
| 45 | |
| 46 | def flushreq(self): |
| 47 | if not self.respsent: |
| 48 | if not self.status: |
| 49 | raise Exception("Cannot send response body before starting response.") |
| 50 | self.respsent = True |
| 51 | self.writehead(self.status, self.headers) |
| 52 | |
| 53 | def write(self, data): |
| 54 | if not data: |
| 55 | return |
| 56 | self.flushreq() |
| 57 | self.writedata(data) |
| 58 | self.handler.ckflush(self) |
| 59 | |
| 60 | def startreq(self, status, headers, exc_info=None): |
| 61 | if self.status: |
| 62 | if exc_info: |
| 63 | try: |
| 64 | if self.respsent: |
| 65 | raise exc_info[1] |
| 66 | finally: |
| 67 | exc_info = None |
| 68 | else: |
| 69 | raise Exception("Can only start responding once.") |
| 70 | self.status = status |
| 71 | self.headers = headers |
| 72 | return self.write |
| 73 | |
| 74 | class handler(object): |
| 75 | def handle(self, request): |
| 76 | raise Exception() |
| 77 | def ckflush(self, req): |
| 78 | while len(req.buffer) > 0: |
| 79 | rls, wls, els = select.select([], [req], [req]) |
| 80 | req.flush() |
| 81 | def close(self): |
| 82 | pass |
| 83 | |
| 84 | @classmethod |
| 85 | def parseargs(cls, **args): |
| 86 | if len(args) > 0: |
| 87 | raise ValueError("unknown handler argument: " + next(iter(args))) |
| 88 | return {} |
| 89 | |
| 90 | class single(handler): |
| 91 | cname = "single" |
| 92 | |
| 93 | def handle(self, req): |
| 94 | try: |
| 95 | env = req.mkenv() |
| 96 | with perf.request(env) as reqevent: |
| 97 | respiter = req.handlewsgi(env, req.startreq) |
| 98 | for data in respiter: |
| 99 | req.write(data) |
| 100 | if req.status: |
| 101 | reqevent.response([req.status, req.headers]) |
| 102 | req.flushreq() |
| 103 | self.ckflush(req) |
| 104 | except closed: |
| 105 | pass |
| 106 | except: |
| 107 | log.error("exception occurred when handling request", exc_info=True) |
| 108 | finally: |
| 109 | req.close() |
| 110 | |
| 111 | class freethread(handler): |
| 112 | cname = "free" |
| 113 | |
| 114 | def __init__(self, *, max=None, timeout=None, **kw): |
| 115 | super().__init__(**kw) |
| 116 | self.current = set() |
| 117 | self.lk = threading.Lock() |
| 118 | self.tcond = threading.Condition(self.lk) |
| 119 | self.max = max |
| 120 | self.timeout = timeout |
| 121 | |
| 122 | @classmethod |
| 123 | def parseargs(cls, *, max=None, abort=None, **args): |
| 124 | ret = super().parseargs(**args) |
| 125 | if max: |
| 126 | ret["max"] = int(max) |
| 127 | if abort: |
| 128 | ret["timeout"] = int(abort) |
| 129 | return ret |
| 130 | |
| 131 | def handle(self, req): |
| 132 | with self.lk: |
| 133 | if self.max is not None: |
| 134 | if self.timeout is not None: |
| 135 | now = start = time.time() |
| 136 | while len(self.current) >= self.max: |
| 137 | self.tcond.wait(start + self.timeout - now) |
| 138 | now = time.time() |
| 139 | if now - start > self.timeout: |
| 140 | os.abort() |
| 141 | else: |
| 142 | while len(self.current) >= self.max: |
| 143 | self.tcond.wait() |
| 144 | th = reqthread(target=self.run, args=[req]) |
| 145 | th.start() |
| 146 | while th.is_alive() and th not in self.current: |
| 147 | self.tcond.wait() |
| 148 | |
| 149 | def run(self, req): |
| 150 | try: |
| 151 | th = threading.current_thread() |
| 152 | with self.lk: |
| 153 | self.current.add(th) |
| 154 | self.tcond.notify_all() |
| 155 | try: |
| 156 | env = req.mkenv() |
| 157 | with perf.request(env) as reqevent: |
| 158 | respiter = req.handlewsgi(env, req.startreq) |
| 159 | for data in respiter: |
| 160 | req.write(data) |
| 161 | if req.status: |
| 162 | reqevent.response([req.status, req.headers]) |
| 163 | req.flushreq() |
| 164 | self.ckflush(req) |
| 165 | except closed: |
| 166 | pass |
| 167 | except: |
| 168 | log.error("exception occurred when handling request", exc_info=True) |
| 169 | finally: |
| 170 | with self.lk: |
| 171 | self.current.remove(th) |
| 172 | self.tcond.notify_all() |
| 173 | finally: |
| 174 | req.close() |
| 175 | |
| 176 | def close(self): |
| 177 | while True: |
| 178 | with self.lk: |
| 179 | if len(self.current) > 0: |
| 180 | th = next(iter(self.current)) |
| 181 | else: |
| 182 | return |
| 183 | th.join() |
| 184 | |
| 185 | class resplex(handler): |
| 186 | cname = "rplex" |
| 187 | |
| 188 | def __init__(self, *, max=None, **kw): |
| 189 | super().__init__(**kw) |
| 190 | self.current = set() |
| 191 | self.lk = threading.Lock() |
| 192 | self.tcond = threading.Condition(self.lk) |
| 193 | self.max = max |
| 194 | self.cqueue = queue.Queue(5) |
| 195 | self.cnpipe = os.pipe() |
| 196 | self.rthread = reqthread(name="Response thread", target=self.handle2) |
| 197 | self.rthread.start() |
| 198 | |
| 199 | @classmethod |
| 200 | def parseargs(cls, *, max=None, **args): |
| 201 | ret = super().parseargs(**args) |
| 202 | if max: |
| 203 | ret["max"] = int(max) |
| 204 | return ret |
| 205 | |
| 206 | def ckflush(self, req): |
| 207 | raise Exception("resplex handler does not support the write() function") |
| 208 | |
| 209 | def handle(self, req): |
| 210 | with self.lk: |
| 211 | if self.max is not None: |
| 212 | while len(self.current) >= self.max: |
| 213 | self.tcond.wait() |
| 214 | th = reqthread(target=self.handle1, args=[req]) |
| 215 | th.start() |
| 216 | while th.is_alive() and th not in self.current: |
| 217 | self.tcond.wait() |
| 218 | |
| 219 | def handle1(self, req): |
| 220 | try: |
| 221 | th = threading.current_thread() |
| 222 | with self.lk: |
| 223 | self.current.add(th) |
| 224 | self.tcond.notify_all() |
| 225 | try: |
| 226 | env = req.mkenv() |
| 227 | respobj = req.handlewsgi(env, req.startreq) |
| 228 | respiter = iter(respobj) |
| 229 | if not req.status: |
| 230 | log.error("request handler returned without calling start_request") |
| 231 | if hasattr(respiter, "close"): |
| 232 | respiter.close() |
| 233 | return |
| 234 | else: |
| 235 | self.cqueue.put((req, respiter)) |
| 236 | os.write(self.cnpipe[1], b" ") |
| 237 | req = None |
| 238 | finally: |
| 239 | with self.lk: |
| 240 | self.current.remove(th) |
| 241 | self.tcond.notify_all() |
| 242 | except closed: |
| 243 | pass |
| 244 | except: |
| 245 | log.error("exception occurred when handling request", exc_info=True) |
| 246 | finally: |
| 247 | if req is not None: |
| 248 | req.close() |
| 249 | |
| 250 | def handle2(self): |
| 251 | try: |
| 252 | rp = self.cnpipe[0] |
| 253 | current = {} |
| 254 | |
| 255 | def closereq(req): |
| 256 | respiter = current[req] |
| 257 | try: |
| 258 | if respiter is not None and hasattr(respiter, "close"): |
| 259 | respiter.close() |
| 260 | except: |
| 261 | log.error("exception occurred when closing iterator", exc_info=True) |
| 262 | try: |
| 263 | req.close() |
| 264 | except: |
| 265 | log.error("exception occurred when closing request", exc_info=True) |
| 266 | del current[req] |
| 267 | def ckiter(req): |
| 268 | respiter = current[req] |
| 269 | if respiter is not None: |
| 270 | rem = False |
| 271 | try: |
| 272 | data = next(respiter) |
| 273 | except StopIteration: |
| 274 | rem = True |
| 275 | try: |
| 276 | req.flushreq() |
| 277 | except: |
| 278 | log.error("exception occurred when handling response data", exc_info=True) |
| 279 | except: |
| 280 | rem = True |
| 281 | log.error("exception occurred when iterating response", exc_info=True) |
| 282 | if not rem: |
| 283 | if data: |
| 284 | try: |
| 285 | req.flushreq() |
| 286 | req.writedata(data) |
| 287 | except: |
| 288 | log.error("exception occurred when handling response data", exc_info=True) |
| 289 | rem = True |
| 290 | if rem: |
| 291 | current[req] = None |
| 292 | try: |
| 293 | if hasattr(respiter, "close"): |
| 294 | respiter.close() |
| 295 | except: |
| 296 | log.error("exception occurred when closing iterator", exc_info=True) |
| 297 | respiter = None |
| 298 | if respiter is None and not req.buffer: |
| 299 | closereq(req) |
| 300 | |
| 301 | while True: |
| 302 | bufl = list(req for req in current.keys() if req.buffer) |
| 303 | rls, wls, els = select.select([rp], bufl, [rp] + bufl) |
| 304 | if rp in rls: |
| 305 | ret = os.read(rp, 1024) |
| 306 | if not ret: |
| 307 | os.close(rp) |
| 308 | return |
| 309 | try: |
| 310 | while True: |
| 311 | req, respiter = self.cqueue.get(False) |
| 312 | current[req] = respiter |
| 313 | ckiter(req) |
| 314 | except queue.Empty: |
| 315 | pass |
| 316 | for req in wls: |
| 317 | try: |
| 318 | req.flush() |
| 319 | except closed: |
| 320 | closereq(req) |
| 321 | except: |
| 322 | log.error("exception occurred when writing response", exc_info=True) |
| 323 | closereq(req) |
| 324 | else: |
| 325 | if len(req.buffer) < 65536: |
| 326 | ckiter(req) |
| 327 | except: |
| 328 | log.critical("unexpected exception occurred in response handler thread", exc_info=True) |
| 329 | os.abort() |
| 330 | |
| 331 | def close(self): |
| 332 | while True: |
| 333 | with self.lk: |
| 334 | if len(self.current) > 0: |
| 335 | th = next(iter(self.current)) |
| 336 | else: |
| 337 | break |
| 338 | th.join() |
| 339 | os.close(self.cnpipe[1]) |
| 340 | self.rthread.join() |
| 341 | |
| 342 | names = {cls.cname: cls for cls in globals().values() if |
| 343 | isinstance(cls, type) and |
| 344 | issubclass(cls, handler) and |
| 345 | hasattr(cls, "cname")} |
| 346 | |
| 347 | def parsehspec(spec): |
| 348 | if ":" not in spec: |
| 349 | return spec, {} |
| 350 | nm, spec = spec.split(":", 1) |
| 351 | args = {} |
| 352 | while spec: |
| 353 | if "," in spec: |
| 354 | part, spec = spec.split(",", 1) |
| 355 | else: |
| 356 | part, spec = spec, None |
| 357 | if "=" in part: |
| 358 | key, val = part.split("=", 1) |
| 359 | else: |
| 360 | key, val = part, "" |
| 361 | args[key] = val |
| 362 | return nm, args |