Commit | Line | Data |
---|---|---|
7f97a47e FT |
1 | """Management for daemon processes |
2 | ||
3 | This module provides some client support for the daemon management | |
4 | provided in the pdm.srv module. | |
5 | """ | |
6 | ||
7 | import socket, pickle, struct, select, threading | |
8 | ||
9 | __all__ = ["client", "replclient"] | |
10 | ||
11 | class protoerr(Exception): | |
12 | pass | |
13 | ||
14 | def resolve(spec): | |
15 | if isinstance(spec, socket.socket): | |
16 | return spec | |
17 | sk = None | |
18 | try: | |
19 | if "/" in spec: | |
20 | sk = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) | |
21 | sk.connect(spec) | |
22 | elif spec.isdigit(): | |
23 | sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
24 | sk.connect(("localhost", int(spec))) | |
25 | elif ":" in spec: | |
26 | sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
27 | p = spec.rindex(":") | |
28 | sk.connect((spec[:p], int(spec[p + 1:]))) | |
29 | else: | |
30 | raise Exception("Unknown target specification %r" % spec) | |
31 | rv = sk | |
32 | sk = None | |
33 | finally: | |
34 | if sk is not None: sk.close() | |
35 | return rv | |
36 | ||
37 | class client(object): | |
38 | def __init__(self, sk, proto = None): | |
39 | self.sk = resolve(sk) | |
40 | self.buf = "" | |
41 | line = self.readline() | |
42 | if line != "+PDM1": | |
43 | raise protoerr("Illegal protocol signature") | |
44 | if proto is not None: | |
45 | self.select(proto) | |
46 | ||
47 | def close(self): | |
48 | self.sk.close() | |
49 | ||
50 | def readline(self): | |
51 | while True: | |
52 | p = self.buf.find("\n") | |
53 | if p >= 0: | |
54 | ret = self.buf[:p] | |
55 | self.buf = self.buf[p + 1:] | |
56 | return ret | |
57 | ret = self.sk.recv(1024) | |
58 | if ret == "": | |
59 | return None | |
60 | self.buf += ret | |
61 | ||
62 | def select(self, proto): | |
63 | if "\n" in proto: | |
64 | raise Exception("Illegal protocol specified: %r" % proto) | |
65 | self.sk.send(proto + "\n") | |
66 | rep = self.readline() | |
67 | if len(rep) < 1 or rep[0] != "+": | |
68 | raise protoerr("Error reply when selecting protocol %s: %s" % (proto, rep[1:])) | |
69 | ||
70 | def __enter__(self): | |
71 | return self | |
72 | ||
73 | def __exit__(self, *excinfo): | |
74 | self.close() | |
75 | return False | |
76 | ||
77 | class replclient(client): | |
78 | def __init__(self, sk): | |
79 | super(replclient, self).__init__(sk, "repl") | |
80 | ||
81 | def run(self, code): | |
82 | while True: | |
83 | ncode = code.replace("\n\n", "\n") | |
84 | if ncode == code: break | |
85 | code = ncode | |
86 | while len(code) > 0 and code[-1] == "\n": | |
87 | code = code[:-1] | |
88 | self.sk.send(code + "\n\n") | |
89 | buf = "" | |
90 | while True: | |
91 | ln = self.readline() | |
92 | if ln[0] == " ": | |
93 | buf += ln[1:] + "\n" | |
94 | elif ln[0] == "+": | |
95 | return buf | |
96 | elif ln[0] == "-": | |
97 | raise protoerr("Error reply: %s" % ln[1:]) | |
98 | else: | |
99 | raise protoerr("Illegal reply: %s" % ln) | |
100 | ||
101 | class perfproxy(object): | |
102 | def __init__(self, cl, id, proto): | |
103 | self.cl = cl | |
104 | self.id = id | |
105 | self.proto = proto | |
106 | self.subscribers = set() | |
107 | ||
108 | def lookup(self, name): | |
109 | self.cl.lock.acquire() | |
110 | try: | |
111 | id = self.cl.nextid | |
112 | self.cl.nextid += 1 | |
113 | finally: | |
114 | self.cl.lock.release() | |
115 | (proto,) = self.cl.run("lookup", id, self.id, name) | |
116 | proxy = perfproxy(self.cl, id, proto) | |
117 | self.cl.proxies[id] = proxy | |
118 | return proxy | |
119 | ||
120 | def listdir(self): | |
121 | return self.cl.run("ls", self.id)[0] | |
122 | ||
123 | def readattr(self): | |
124 | return self.cl.run("readattr", self.id)[0] | |
125 | ||
126 | def attrinfo(self): | |
127 | return self.cl.run("attrinfo", self.id)[0] | |
128 | ||
129 | def invoke(self, method, *args, **kwargs): | |
130 | return self.cl.run("invoke", self.id, method, args, kwargs)[0] | |
131 | ||
132 | def subscribe(self, cb): | |
133 | if cb in self.subscribers: | |
134 | raise ValueError("Already subscribed") | |
135 | if len(self.subscribers) == 0: | |
136 | self.cl.run("subs", self.id) | |
137 | self.subscribers.add(cb) | |
138 | ||
441160a2 | 139 | def unsubscribe(self, cb): |
7f97a47e FT |
140 | if cb not in self.subscribers: |
141 | raise ValueError("Not subscribed") | |
142 | self.subscribers.remove(cb) | |
143 | if len(self.subscribers) == 0: | |
144 | self.cl.run("unsubs", self.id) | |
145 | ||
146 | def notify(self, ev): | |
147 | for cb in self.subscribers: | |
148 | try: | |
149 | cb(ev) | |
150 | except: pass | |
151 | ||
152 | def close(self): | |
153 | self.cl.run("unbind", self.id) | |
154 | del self.cl.proxies[self.id] | |
155 | ||
156 | def __enter__(self): | |
157 | return self | |
158 | ||
159 | def __exit__(self, *excinfo): | |
160 | self.close() | |
161 | return False | |
162 | ||
163 | class perfclient(client): | |
164 | def __init__(self, sk): | |
165 | super(perfclient, self).__init__(sk, "perf") | |
166 | self.nextid = 0 | |
167 | self.lock = threading.Lock() | |
168 | self.proxies = {} | |
169 | self.names = {} | |
170 | ||
171 | def send(self, ob): | |
172 | buf = pickle.dumps(ob) | |
173 | buf = struct.pack(">l", len(buf)) + buf | |
174 | self.sk.send(buf) | |
175 | ||
176 | def recvb(self, num): | |
177 | buf = "" | |
178 | while len(buf) < num: | |
179 | data = self.sk.recv(num - len(buf)) | |
180 | if data == "": | |
181 | raise EOFError() | |
182 | buf += data | |
183 | return buf | |
184 | ||
185 | def recv(self): | |
186 | return pickle.loads(self.recvb(struct.unpack(">l", self.recvb(4))[0])) | |
187 | ||
188 | def event(self, id, ev): | |
189 | proxy = self.proxies.get(id) | |
190 | if proxy is None: return | |
191 | proxy.notify(ev) | |
192 | ||
193 | def dispatch(self, timeout = None): | |
194 | rfd, wfd, efd = select.select([self.sk], [], [], timeout) | |
195 | if self.sk in rfd: | |
196 | msg = self.recv() | |
197 | if msg[0] == "*": | |
198 | self.event(msg[1], msg[2]) | |
199 | else: | |
200 | raise ValueError("Unexpected non-event message: %r" % msg[0]) | |
201 | ||
202 | def recvreply(self): | |
203 | while True: | |
204 | reply = self.recv() | |
205 | if reply[0] in ("+", "-"): | |
206 | return reply | |
207 | elif reply[0] == "*": | |
208 | self.event(reply[1], reply[2]) | |
209 | else: | |
210 | raise ValueError("Illegal reply header: %r" % reply[0]) | |
211 | ||
212 | def run(self, cmd, *args): | |
213 | self.lock.acquire() | |
214 | try: | |
215 | self.send((cmd,) + args) | |
216 | reply = self.recvreply() | |
217 | if reply[0] == "+": | |
218 | return reply[1:] | |
219 | else: | |
220 | raise reply[1] | |
221 | finally: | |
222 | self.lock.release() | |
223 | ||
224 | def lookup(self, module, obnm): | |
225 | self.lock.acquire() | |
226 | try: | |
227 | id = self.nextid | |
228 | self.nextid += 1 | |
229 | finally: | |
230 | self.lock.release() | |
231 | (proto,) = self.run("bind", id, module, obnm) | |
232 | proxy = perfproxy(self, id, proto) | |
233 | self.proxies[id] = proxy | |
234 | return proxy | |
235 | ||
236 | def find(self, name): | |
237 | ret = self.names.get(name) | |
238 | if ret is None: | |
239 | if "/" in name: | |
240 | p = name.rindex("/") | |
241 | ret = self.find(name[:p]).lookup(name[p + 1:]) | |
242 | else: | |
243 | p = name.rindex(".") | |
244 | ret = self.lookup(name[:p], name[p + 1:]) | |
245 | self.names[name] = ret | |
246 | return ret |