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| 1 | #!/usr/bin/env python | ||
| 2 | |||
| 3 | # client.py - A client providing high level methods for accessing a Styx server. | ||
| 4 | # | ||
| 5 | # Copyright (C) 2018 David Boddie <david@boddie.org.uk> | ||
| 6 | # | ||
| 7 | # This program is free software: you can redistribute it and/or modify | ||
| 8 | # it under the terms of the GNU General Public License as published by | ||
| 9 | # the Free Software Foundation, either version 3 of the License, or | ||
| 10 | # (at your option) any later version. | ||
| 11 | # | ||
| 12 | # This program is distributed in the hope that it will be useful, | ||
| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 15 | # GNU General Public License for more details. | ||
| 16 | # | ||
| 17 | # You should have received a copy of the GNU General Public License | ||
| 18 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| 19 | |||
| 20 | import socket | ||
| 21 | import styx | ||
| 22 | |||
| 23 | class ClientError(Exception): | ||
| 24 | pass | ||
| 25 | |||
| 26 | class Client: | ||
| 27 | |||
| 28 | MSIZE = 16384 | ||
| 29 | |||
| 30 | def __init__(self, host = None, port = None, uname = None, aname = None): | ||
| 31 | |||
| 32 | self.reset() | ||
| 33 | |||
| 34 | self.uname = uname | ||
| 35 | self.aname = aname | ||
| 36 | |||
| 37 | if host != None and port != None: | ||
| 38 | self.connect(host, port, uname, aname) | ||
| 39 | |||
| 40 | def reset(self): | ||
| 41 | |||
| 42 | self.host = None | ||
| 43 | self.port = None | ||
| 44 | |||
| 45 | self.socket = None | ||
| 46 | self.msize = Client.MSIZE | ||
| 47 | self.root_fid = 0 | ||
| 48 | self.current_fid = None | ||
| 49 | |||
| 50 | self.replies = {} | ||
| 51 | |||
| 52 | def connect(self, host, port, uname, aname): | ||
| 53 | |||
| 54 | try: | ||
| 55 | s = socket.socket() | ||
| 56 | s.connect((host, port)) | ||
| 57 | except socket.error: | ||
| 58 | raise ClientError("Failed to connect to %s:%i." % (host, port)) | ||
| 59 | |||
| 60 | self.host = host | ||
| 61 | self.port = port | ||
| 62 | self.socket = s | ||
| 63 | |||
| 64 | # Negotiate a version and maximum message size. | ||
| 65 | reply = self.send(styx.Tversion(tag=0, msize=self.msize, version=u"9P2000")) | ||
| 66 | |||
| 67 | if reply.version != u"9P2000": | ||
| 68 | raise ClientError("Server's protocol version '%s' is not supported." % reply.version) | ||
| 69 | |||
| 70 | self.msize = min(self.msize, reply.msize) | ||
| 71 | |||
| 72 | reply = self.send(styx.Tattach(tag=1, fid=1, afid=0, uname=uname, aname=aname)) | ||
| 73 | |||
| 74 | self.root_fid = self.current_fid = 1 | ||
| 75 | |||
| 76 | def disconnect(self): | ||
| 77 | |||
| 78 | self.send(styx.Tclunk(tag=2, fid=self.root_fid)) | ||
| 79 | self.socket.close() | ||
| 80 | |||
| 81 | self.reset() | ||
| 82 | |||
| 83 | def send(self, msg): | ||
| 84 | |||
| 85 | print msg | ||
| 86 | msg.encode(self.socket) | ||
| 87 | |||
| 88 | tag = msg.tag | ||
| 89 | |||
| 90 | while tag not in self.replies: | ||
| 91 | |||
| 92 | reply = styx.decode(sock=self.socket) | ||
| 93 | print reply | ||
| 94 | if reply.tag == tag: | ||
| 95 | break | ||
| 96 | else: | ||
| 97 | self.replies[tag] = reply | ||
| 98 | else: | ||
| 99 | reply = self.replies[tag] | ||
| 100 | del self.replies[tag] | ||
| 101 | |||
| 102 | if isinstance(reply, styx.Rerror): | ||
| 103 | raise ClientError(reply.ename) | ||
| 104 | |||
| 105 | return reply | ||
| 106 | |||
| 107 | def _clunk(self, fid): | ||
| 108 | |||
| 109 | self.send(styx.Tclunk(tag=2, fid=fid)) | ||
| 110 | |||
| 111 | def _stat(self, fid): | ||
| 112 | |||
| 113 | reply = self.send(styx.Tstat(tag=2, fid=fid)) | ||
| 114 | return reply.stat | ||
| 115 | |||
| 116 | def _next_fid(self): | ||
| 117 | |||
| 118 | if self.current_fid != self.root_fid: | ||
| 119 | return self.current_fid + 1 | ||
| 120 | else: | ||
| 121 | return self.root_fid + 1 | ||
| 122 | |||
| 123 | def ls(self, path): | ||
| 124 | |||
| 125 | pieces = path.split("/") | ||
| 126 | newfid = self._next_fid() | ||
| 127 | |||
| 128 | reply = self.send(styx.Twalk(tag=2, fid=self.current_fid, | ||
| 129 | newfid=newfid, wname=pieces)) | ||
| 130 | |||
| 131 | if reply.nwqid < len(pieces): | ||
| 132 | raise ClientError("No such file or directory: %s" % \ | ||
| 133 | "/".join(pieces[:reply.nwqid])) | ||
| 134 | |||
| 135 | s = self._stat(newfid) | ||
| 136 | |||
| 137 | if s.mode & styx.Stat.DMDIR: | ||
| 138 | self.send(styx.Topen(tag=2, fid=newfid, mode=0)) | ||
| 139 | |||
| 140 | data = "" | ||
| 141 | amount = self.msize - 24 | ||
| 142 | |||
| 143 | while True: | ||
| 144 | |||
| 145 | reply = self.send(styx.Tread( | ||
| 146 | tag=2, fid=newfid, offset=len(data), count=amount)) | ||
| 147 | data += reply.data | ||
| 148 | |||
| 149 | if len(reply.data) == 0: | ||
| 150 | break | ||
| 151 | |||
| 152 | info = styx.Stat().decode(data=data) | ||
| 153 | else: | ||
| 154 | info = s | ||
| 155 | |||
| 156 | self._clunk(newfid) | ||
| 157 | return info | ||
| 158 | |||
| 159 | def cd(self, path): | ||
| 160 | |||
| 161 | pieces = path.split("/") | ||
| 162 | newfid = self._next_fid() | ||
| 163 | |||
| 164 | reply = self.send(styx.Twalk(tag=2, fid=self.current_fid, | ||
| 165 | newfid=newfid, wname=pieces)) | ||
| 166 | |||
| 167 | if reply.nwqid < len(pieces): | ||
| 168 | raise ClientError("No such file or directory: %s" % \ | ||
| 169 | "/".join(pieces[:reply.nwqid])) | ||
| 170 | |||
| 171 | if self.current_fid != self.root_fid: | ||
| 172 | self._clunk(self.current_fid) | ||
| 173 | |||
| 174 | self.current_fid = newfid | ||