| 1 | """Management for daemon processes |
| 2 | |
| 3 | This module provides some client support for the daemon management |
| 4 | provided in the ashd.pdm module. |
| 5 | """ |
| 6 | |
| 7 | import socket |
| 8 | |
| 9 | class protoerr(Exception): |
| 10 | pass |
| 11 | |
| 12 | def resolve(spec): |
| 13 | if isinstance(spec, socket.socket): |
| 14 | return spec |
| 15 | sk = None |
| 16 | try: |
| 17 | if "/" in spec: |
| 18 | sk = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) |
| 19 | sk.connect(spec) |
| 20 | elif spec.isdigit(): |
| 21 | sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
| 22 | sk.connect(("localhost", int(spec))) |
| 23 | elif ":" in spec: |
| 24 | sk = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
| 25 | p = spec.rindex(":") |
| 26 | sk.connect((spec[:p], int(spec[p + 1:]))) |
| 27 | else: |
| 28 | raise Exception("Unknown target specification %r" % spec) |
| 29 | rv = sk |
| 30 | sk = None |
| 31 | finally: |
| 32 | if sk is not None: sk.close() |
| 33 | return rv |
| 34 | |
| 35 | class client(object): |
| 36 | def __init__(self, sk, proto = None): |
| 37 | self.sk = resolve(sk) |
| 38 | self.buf = "" |
| 39 | line = self.readline() |
| 40 | if line != "+PDM1": |
| 41 | raise protoerr("Illegal protocol signature") |
| 42 | if proto is not None: |
| 43 | self.select(proto) |
| 44 | |
| 45 | def close(self): |
| 46 | self.sk.close() |
| 47 | |
| 48 | def readline(self): |
| 49 | while True: |
| 50 | p = self.buf.find("\n") |
| 51 | if p >= 0: |
| 52 | ret = self.buf[:p] |
| 53 | self.buf = self.buf[p + 1:] |
| 54 | return ret |
| 55 | ret = self.sk.recv(1024) |
| 56 | if ret == "": |
| 57 | return None |
| 58 | self.buf += ret |
| 59 | |
| 60 | def select(self, proto): |
| 61 | if "\n" in proto: |
| 62 | raise Exception("Illegal protocol specified: %r" % proto) |
| 63 | self.sk.send(proto + "\n") |
| 64 | rep = self.readline() |
| 65 | if len(rep) < 1 or rep[0] != "+": |
| 66 | raise protoerr("Error reply when selecting protocol %s: %s" % (proto, rep[1:])) |
| 67 | |
| 68 | def __enter__(self): |
| 69 | return self |
| 70 | |
| 71 | def __exit__(self, *excinfo): |
| 72 | self.close() |
| 73 | return False |
| 74 | |
| 75 | class replclient(client): |
| 76 | def __init__(self, sk): |
| 77 | super(replclient, self).__init__(sk, "repl") |
| 78 | |
| 79 | def run(self, code): |
| 80 | while True: |
| 81 | ncode = code.replace("\n\n", "\n") |
| 82 | if ncode == code: break |
| 83 | code = ncode |
| 84 | while len(code) > 0 and code[-1] == "\n": |
| 85 | code = code[:-1] |
| 86 | self.sk.send(code + "\n\n") |
| 87 | buf = "" |
| 88 | while True: |
| 89 | ln = self.readline() |
| 90 | if ln[0] == " ": |
| 91 | buf += ln[1:] + "\n" |
| 92 | elif ln[0] == "+": |
| 93 | return buf |
| 94 | elif ln[0] == "-": |
| 95 | raise protoerr("Error reply: %s" % ln[1:]) |
| 96 | else: |
| 97 | raise protoerr("Illegal reply: %s" % ln) |