| 1 | import sys, os, threading, time, logging, select |
| 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 | raise Exception() |
| 79 | def close(self): |
| 80 | pass |
| 81 | |
| 82 | @classmethod |
| 83 | def parseargs(cls, **args): |
| 84 | if len(args) > 0: |
| 85 | raise ValueError("unknown handler argument: " + next(iter(args))) |
| 86 | return {} |
| 87 | |
| 88 | class freethread(handler): |
| 89 | def __init__(self, *, max=None, **kw): |
| 90 | super().__init__(**kw) |
| 91 | self.current = set() |
| 92 | self.lk = threading.Lock() |
| 93 | self.tcond = threading.Condition(self.lk) |
| 94 | self.max = max |
| 95 | |
| 96 | @classmethod |
| 97 | def parseargs(cls, *, max=None, **args): |
| 98 | ret = super().parseargs(**args) |
| 99 | if max: |
| 100 | ret["max"] = int(max) |
| 101 | return ret |
| 102 | |
| 103 | def handle(self, req): |
| 104 | with self.lk: |
| 105 | while self.max is not None and len(self.current) >= self.max: |
| 106 | self.tcond.wait() |
| 107 | th = reqthread(target=self.run, args=[req]) |
| 108 | th.start() |
| 109 | while th.is_alive() and th not in self.current: |
| 110 | self.tcond.wait() |
| 111 | |
| 112 | def ckflush(self, req): |
| 113 | while len(req.buffer) > 0: |
| 114 | rls, wls, els = select.select([], [req], [req]) |
| 115 | req.flush() |
| 116 | |
| 117 | def run(self, req): |
| 118 | try: |
| 119 | th = threading.current_thread() |
| 120 | with self.lk: |
| 121 | self.current.add(th) |
| 122 | self.tcond.notify_all() |
| 123 | try: |
| 124 | env = req.mkenv() |
| 125 | with perf.request(env) as reqevent: |
| 126 | respiter = req.handlewsgi(env, req.startreq) |
| 127 | for data in respiter: |
| 128 | req.write(data) |
| 129 | if req.status: |
| 130 | reqevent.response([req.status, req.headers]) |
| 131 | req.flushreq() |
| 132 | self.ckflush(req) |
| 133 | except closed: |
| 134 | pass |
| 135 | except: |
| 136 | log.error("exception occurred when handling request", exc_info=True) |
| 137 | finally: |
| 138 | with self.lk: |
| 139 | self.current.remove(th) |
| 140 | self.tcond.notify_all() |
| 141 | finally: |
| 142 | req.close() |
| 143 | |
| 144 | def close(self): |
| 145 | while True: |
| 146 | with self.lk: |
| 147 | if len(self.current) > 0: |
| 148 | th = next(iter(self.current)) |
| 149 | else: |
| 150 | return |
| 151 | th.join() |
| 152 | |
| 153 | class threadpool(handler): |
| 154 | def __init__(self, *, min=0, max=20, live=300, **kw): |
| 155 | super().__init__(**kw) |
| 156 | self.current = set() |
| 157 | self.free = set() |
| 158 | self.lk = threading.RLock() |
| 159 | self.pcond = threading.Condition(self.lk) |
| 160 | self.rcond = threading.Condition(self.lk) |
| 161 | self.wreq = None |
| 162 | self.min = min |
| 163 | self.max = max |
| 164 | self.live = live |
| 165 | for i in range(self.min): |
| 166 | self.newthread() |
| 167 | |
| 168 | @classmethod |
| 169 | def parseargs(cls, *, min=None, max=None, live=None, **args): |
| 170 | ret = super().parseargs(**args) |
| 171 | if min: |
| 172 | ret["min"] = int(min) |
| 173 | if max: |
| 174 | ret["max"] = int(max) |
| 175 | if live: |
| 176 | ret["live"] = int(live) |
| 177 | return ret |
| 178 | |
| 179 | def newthread(self): |
| 180 | with self.lk: |
| 181 | th = reqthread(target=self.loop) |
| 182 | th.start() |
| 183 | while not th in self.current: |
| 184 | self.pcond.wait() |
| 185 | |
| 186 | def ckflush(self, req): |
| 187 | while len(req.buffer) > 0: |
| 188 | rls, wls, els = select.select([], [req], [req]) |
| 189 | req.flush() |
| 190 | |
| 191 | def _handle(self, req): |
| 192 | try: |
| 193 | env = req.mkenv() |
| 194 | with perf.request(env) as reqevent: |
| 195 | respiter = req.handlewsgi(env, req.startreq) |
| 196 | for data in respiter: |
| 197 | req.write(data) |
| 198 | if req.status: |
| 199 | reqevent.response([req.status, req.headers]) |
| 200 | req.flushreq() |
| 201 | self.ckflush(req) |
| 202 | except closed: |
| 203 | pass |
| 204 | except: |
| 205 | log.error("exception occurred when handling request", exc_info=True) |
| 206 | finally: |
| 207 | req.close() |
| 208 | |
| 209 | def loop(self): |
| 210 | th = threading.current_thread() |
| 211 | with self.lk: |
| 212 | self.current.add(th) |
| 213 | try: |
| 214 | while True: |
| 215 | with self.lk: |
| 216 | self.free.add(th) |
| 217 | try: |
| 218 | self.pcond.notify_all() |
| 219 | now = start = time.time() |
| 220 | while self.wreq is None: |
| 221 | self.rcond.wait(start + self.live - now) |
| 222 | now = time.time() |
| 223 | if now - start > self.live: |
| 224 | if len(self.current) > self.min: |
| 225 | self.current.remove(th) |
| 226 | return |
| 227 | else: |
| 228 | start = now |
| 229 | req, self.wreq = self.wreq, None |
| 230 | self.pcond.notify_all() |
| 231 | finally: |
| 232 | self.free.remove(th) |
| 233 | self._handle(req) |
| 234 | req = None |
| 235 | finally: |
| 236 | with self.lk: |
| 237 | try: |
| 238 | self.current.remove(th) |
| 239 | except KeyError: |
| 240 | pass |
| 241 | self.pcond.notify_all() |
| 242 | |
| 243 | def handle(self, req): |
| 244 | while True: |
| 245 | with self.lk: |
| 246 | if len(self.free) < 1 and len(self.current) < self.max: |
| 247 | self.newthread() |
| 248 | while self.wreq is not None: |
| 249 | self.pcond.wait() |
| 250 | if self.wreq is None: |
| 251 | self.wreq = req |
| 252 | self.rcond.notify(1) |
| 253 | return |
| 254 | |
| 255 | def close(self): |
| 256 | self.live = 0 |
| 257 | self.min = 0 |
| 258 | with self.lk: |
| 259 | while len(self.current) > 0: |
| 260 | self.rcond.notify_all() |
| 261 | self.pcond.wait(1) |
| 262 | |
| 263 | names = {"free": freethread, |
| 264 | "pool": threadpool} |
| 265 | |
| 266 | def parsehspec(spec): |
| 267 | if ":" not in spec: |
| 268 | return spec, {} |
| 269 | nm, spec = spec.split(":", 1) |
| 270 | args = {} |
| 271 | while spec: |
| 272 | if "," in spec: |
| 273 | part, spec = spec.split(",", 1) |
| 274 | else: |
| 275 | part, spec = spec, None |
| 276 | if "=" in part: |
| 277 | key, val = part.split("=", 1) |
| 278 | else: |
| 279 | key, val = part, "" |
| 280 | args[key] = val |
| 281 | return nm, args |