Commit | Line | Data |
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940f9c46 FT |
1 | import sys, os, errno, threading, select, traceback |
2 | ||
3 | class epoller(object): | |
4 | exc_handler = None | |
c32cd0db | 5 | |
407963f2 | 6 | def __init__(self, check=None): |
940f9c46 | 7 | self.registered = {} |
c32cd0db | 8 | self.lock = threading.RLock() |
940f9c46 | 9 | self.ep = None |
c32cd0db | 10 | self.th = None |
90007675 | 11 | self.stopped = False |
407963f2 FT |
12 | self.loopcheck = set() |
13 | if check is not None: | |
14 | self.loopcheck.add(check) | |
940f9c46 | 15 | self._daemon = True |
c32cd0db | 16 | |
940f9c46 FT |
17 | @staticmethod |
18 | def _evsfor(ch): | |
19 | return ((select.EPOLLIN if ch.readable else 0) | | |
20 | (select.EPOLLOUT if ch.writable else 0)) | |
c32cd0db FT |
21 | |
22 | def _ckrun(self): | |
940f9c46 FT |
23 | if self.registered and self.th is None: |
24 | th = threading.Thread(target=self._run, name="Async epoll thread") | |
25 | th.daemon = self._daemon | |
c32cd0db FT |
26 | th.start() |
27 | self.th = th | |
28 | ||
940f9c46 FT |
29 | def exception(self, ch, *exc): |
30 | self.remove(ch) | |
31 | if self.exc_handler is None: | |
8963785b | 32 | traceback.print_exception(*exc) |
940f9c46 FT |
33 | else: |
34 | self.exc_handler(ch, *exc) | |
c32cd0db | 35 | |
940f9c46 FT |
36 | def _cb(self, ch, nm): |
37 | try: | |
38 | m = getattr(ch, nm, None) | |
39 | if m is None: | |
40 | raise AttributeError("%r has no %s method" % (ch, nm)) | |
41 | m() | |
42 | except Exception as exc: | |
43 | self.exception(ch, *sys.exc_info()) | |
c32cd0db | 44 | |
90007675 FT |
45 | def _closeall(self): |
46 | with self.lock: | |
47 | while self.registered: | |
48 | fd, (ch, evs) = next(iter(self.registered.items())) | |
49 | del self.registered[fd] | |
50 | self.ep.unregister(fd) | |
51 | self._cb(ch, "close") | |
52 | ||
c32cd0db | 53 | def _run(self): |
940f9c46 | 54 | ep = select.epoll() |
c32cd0db | 55 | try: |
940f9c46 | 56 | with self.lock: |
c26129cd FT |
57 | try: |
58 | for fd, (ob, evs) in self.registered.items(): | |
59 | ep.register(fd, evs) | |
60 | except: | |
61 | self.registered.clear() | |
62 | raise | |
940f9c46 FT |
63 | self.ep = ep |
64 | ||
65 | while self.registered: | |
407963f2 FT |
66 | for ck in self.loopcheck: |
67 | ck(self) | |
90007675 FT |
68 | if self.stopped: |
69 | self._closeall() | |
70 | break | |
940f9c46 FT |
71 | try: |
72 | evlist = ep.poll(10) | |
73 | except IOError as exc: | |
74 | if exc.errno == errno.EINTR: | |
75 | continue | |
76 | raise | |
77 | for fd, evs in evlist: | |
78 | with self.lock: | |
79 | if fd not in self.registered: | |
80 | continue | |
81 | ch, cevs = self.registered[fd] | |
82 | if fd in self.registered and evs & (select.EPOLLIN | select.EPOLLHUP | select.EPOLLERR): | |
83 | self._cb(ch, "read") | |
84 | if fd in self.registered and evs & select.EPOLLOUT: | |
85 | self._cb(ch, "write") | |
86 | if fd in self.registered: | |
87 | nevs = self._evsfor(ch) | |
88 | if nevs == 0: | |
89 | del self.registered[fd] | |
90 | ep.unregister(fd) | |
91 | self._cb(ch, "close") | |
92 | elif nevs != cevs: | |
93 | self.registered[fd] = ch, nevs | |
94 | ep.modify(fd, nevs) | |
95 | ||
c32cd0db FT |
96 | finally: |
97 | with self.lock: | |
98 | self.th = None | |
940f9c46 | 99 | self.ep = None |
c32cd0db | 100 | self._ckrun() |
940f9c46 FT |
101 | ep.close() |
102 | ||
103 | @property | |
104 | def daemon(self): return self._daemon | |
105 | @daemon.setter | |
106 | def daemon(self, value): | |
107 | self._daemon = bool(value) | |
108 | with self.lock: | |
109 | if self.th is not None: | |
110 | self.th = daemon = self._daemon | |
111 | ||
112 | def add(self, ch): | |
113 | with self.lock: | |
114 | fd = ch.fileno() | |
115 | if fd in self.registered: | |
116 | raise KeyError("fd %i is already registered" % fd) | |
117 | evs = self._evsfor(ch) | |
118 | if evs == 0: | |
119 | ch.close() | |
120 | return | |
121 | ch.watcher = self | |
122 | self.registered[fd] = (ch, evs) | |
123 | if self.ep: | |
124 | self.ep.register(fd, evs) | |
125 | self._ckrun() | |
126 | ||
127 | def remove(self, ch, ignore=False): | |
128 | with self.lock: | |
129 | fd = ch.fileno() | |
130 | if fd not in self.registered: | |
131 | if ignore: | |
132 | return | |
133 | raise KeyError("fd %i is not registered" % fd) | |
134 | pch, cevs = self.registered[fd] | |
135 | if pch is not ch: | |
136 | raise ValueError("fd %i registered via object %r, cannot remove with %r" % (pch, ch)) | |
137 | del self.registered[fd] | |
138 | if self.ep: | |
139 | self.ep.unregister(fd) | |
140 | ch.close() | |
141 | ||
142 | def update(self, ch, ignore=False): | |
143 | with self.lock: | |
144 | fd = ch.fileno() | |
145 | if fd not in self.registered: | |
146 | if ignore: | |
147 | return | |
148 | raise KeyError("fd %i is not registered" % fd) | |
149 | pch, cevs = self.registered[fd] | |
150 | if pch is not ch: | |
151 | raise ValueError("fd %i registered via object %r, cannot update with %r" % (pch, ch)) | |
152 | evs = self._evsfor(ch) | |
153 | if evs == 0: | |
154 | del self.registered[fd] | |
155 | if self.ep: | |
156 | self.ep.unregister(fd) | |
157 | ch.close() | |
158 | elif evs != cevs: | |
159 | self.registered[fd] = ch, evs | |
160 | if self.ep: | |
161 | self.ep.modify(fd, evs) | |
162 | ||
90007675 FT |
163 | def stop(self): |
164 | if threading.current_thread() == self.th: | |
165 | self.stopped = True | |
166 | else: | |
167 | def tgt(): | |
168 | self.stopped = True | |
169 | cb = callbuffer() | |
170 | cb.call(tgt) | |
171 | cb.stop() | |
172 | self.add(cb) | |
173 | ||
940f9c46 FT |
174 | def watcher(): |
175 | return epoller() | |
176 | ||
be6ec4ec FT |
177 | class channel(object): |
178 | readable = False | |
179 | writable = False | |
180 | ||
181 | def __init__(self): | |
182 | self.watcher = None | |
183 | ||
184 | def fileno(self): | |
185 | raise NotImplementedError("fileno()") | |
186 | ||
187 | def close(self): | |
188 | pass | |
189 | ||
190 | class sockbuffer(channel): | |
191 | def __init__(self, socket, **kwargs): | |
192 | super().__init__(**kwargs) | |
193 | self.sk = socket | |
940f9c46 | 194 | self.eof = False |
c32cd0db | 195 | self.obuf = bytearray() |
c32cd0db FT |
196 | |
197 | def fileno(self): | |
198 | return self.sk.fileno() | |
199 | ||
200 | def close(self): | |
940f9c46 | 201 | self.sk.close() |
c32cd0db FT |
202 | |
203 | def gotdata(self, data): | |
204 | if data == b"": | |
940f9c46 | 205 | self.eof = True |
c32cd0db | 206 | |
940f9c46 FT |
207 | def send(self, data, eof=False): |
208 | self.obuf.extend(data) | |
209 | if eof: | |
210 | self.eof = True | |
211 | if self.watcher is not None: | |
212 | self.watcher.update(self, True) | |
c32cd0db | 213 | |
940f9c46 FT |
214 | @property |
215 | def readable(self): | |
216 | return not self.eof | |
217 | def read(self): | |
c32cd0db | 218 | try: |
940f9c46 FT |
219 | data = self.sk.recv(1024) |
220 | self.gotdata(data) | |
c32cd0db | 221 | except IOError: |
940f9c46 FT |
222 | self.obuf[:] = b"" |
223 | self.eof = True | |
c32cd0db | 224 | |
940f9c46 FT |
225 | @property |
226 | def writable(self): | |
227 | return bool(self.obuf); | |
228 | def write(self): | |
c32cd0db | 229 | try: |
940f9c46 FT |
230 | ret = self.sk.send(self.obuf) |
231 | self.obuf[:ret] = b"" | |
c32cd0db | 232 | except IOError: |
940f9c46 FT |
233 | self.obuf[:] = b"" |
234 | self.eof = True | |
235 | ||
be6ec4ec FT |
236 | class callbuffer(channel): |
237 | def __init__(self, **kwargs): | |
238 | super().__init__(**kwargs) | |
940f9c46 FT |
239 | self.queue = [] |
240 | self.rp, self.wp = os.pipe() | |
241 | self.lock = threading.Lock() | |
242 | self.eof = False | |
243 | ||
244 | def fileno(self): | |
245 | return self.rp | |
246 | ||
247 | def close(self): | |
248 | with self.lock: | |
249 | try: | |
250 | if self.wp >= 0: | |
251 | os.close(self.wp) | |
252 | self.wp = -1 | |
253 | finally: | |
254 | if self.rp >= 0: | |
255 | os.close(self.rp) | |
256 | self.rp = -1 | |
257 | ||
258 | @property | |
259 | def readable(self): | |
260 | return not self.eof | |
261 | def read(self): | |
262 | with self.lock: | |
263 | try: | |
264 | data = os.read(self.rp, 1024) | |
265 | if data == b"": | |
266 | self.eof = True | |
267 | except IOError: | |
268 | self.eof = True | |
269 | cbs = list(self.queue) | |
270 | self.queue[:] = [] | |
271 | for cb in cbs: | |
272 | cb() | |
273 | ||
274 | writable = False | |
275 | ||
276 | def call(self, cb): | |
277 | with self.lock: | |
278 | if self.wp < 0: | |
279 | raise Exception("stopped") | |
280 | self.queue.append(cb) | |
281 | os.write(self.wp, b"a") | |
282 | ||
283 | def stop(self): | |
284 | with self.lock: | |
285 | if self.wp >= 0: | |
286 | os.close(self.wp) | |
287 | self.wp = -1 | |
90007675 FT |
288 | |
289 | def currentwatcher(io, current): | |
407963f2 FT |
290 | def check(io): |
291 | if not current: | |
292 | io.stop() | |
293 | io.loopcheck.add(check) |