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