Merge upstream
[jelmer/dulwich-libgit2.git] / dulwich / client.py
1 # server.py -- Implementation of the server side git protocols
2 # Copryight (C) 2008 Jelmer Vernooij <jelmer@samba.org>
3 #
4 # This program is free software; you can redistribute it and/or
5 # modify it under the terms of the GNU General Public License
6 # as published by the Free Software Foundation; version 2
7 # of the License.
8 #
9 # This program is distributed in the hope that it will be useful,
10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 # GNU General Public License for more details.
13 #
14 # You should have received a copy of the GNU General Public License
15 # along with this program; if not, write to the Free Software
16 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
17 # MA  02110-1301, USA.
18
19 import select
20 import socket
21 from dulwich.protocol import Protocol, TCP_GIT_PORT, extract_capabilities
22
23 class SimpleFetchGraphWalker(object):
24
25     def __init__(self, local_heads, get_parents):
26         self.heads = set(local_heads)
27         self.get_parents = get_parents
28         self.parents = {}
29
30     def ack(self, ref):
31         if ref in self.heads:
32             self.heads.remove(ref)
33         if ref in self.parents:
34             for p in self.parents[ref]:
35                 self.ack(p)
36
37     def next(self):
38         if self.heads:
39             ret = self.heads.pop()
40             ps = self.get_parents(ret)
41             self.parents[ret] = ps
42             self.heads.update(ps)
43             return ret
44         return None
45
46
47 class GitClient(object):
48     """Git smart server client.
49
50     """
51
52     def __init__(self, fileno, read, write):
53         self.proto = Protocol(read, write)
54         self.fileno = fileno
55
56     def capabilities(self):
57         return "multi_ack side-band-64k thin-pack ofs-delta"
58
59     def read_refs(self):
60         server_capabilities = None
61         refs = {}
62         # Receive refs from server
63         for pkt in self.proto.read_pkt_seq():
64             (sha, ref) = pkt.rstrip("\n").split(" ", 1)
65             if server_capabilities is None:
66                 (ref, server_capabilities) = extract_capabilities(ref)
67             if not (ref == "capabilities^{}" and sha == "0" * 40):
68                 refs[ref] = sha
69         return refs, server_capabilities
70
71     def send_pack(self, path):
72         refs, server_capabilities = self.read_refs()
73         changed_refs = [] # FIXME
74         if not changed_refs:
75             self.proto.write_pkt_line(None)
76             return
77         self.proto.write_pkt_line("%s %s %s\0%s" % (changed_refs[0][0], changed_refs[0][1], changed_refs[0][2], self.capabilities()))
78         want = []
79         have = []
80         for changed_ref in changed_refs[:]:
81             self.proto.write_pkt_line("%s %s %s" % changed_refs)
82             want.append(changed_refs[1])
83             if changed_refs[0] != "0"*40:
84                 have.append(changed_refs[0])
85         self.proto.write_pkt_line(None)
86         # FIXME: This is implementation specific
87         # shas = generate_pack_contents(want, have, None)
88         # write_pack_data(self.write, shas, len(shas))
89
90     def fetch_pack(self, path, determine_wants, graph_walker, pack_data, progress):
91         """Retrieve a pack from a git smart server.
92
93         :param determine_wants: Callback that returns list of commits to fetch
94         :param graph_walker: Object with next() and ack().
95         :param pack_data: Callback called for each bit of data in the pack
96         :param progress: Callback for progress reports (strings)
97         """
98         (refs, server_capabilities) = self.read_refs()
99        
100         wants = determine_wants(refs)
101         if not wants:
102             self.proto.write_pkt_line(None)
103             return
104         self.proto.write_pkt_line("want %s %s\n" % (wants[0], self.capabilities()))
105         for want in wants[1:]:
106             self.proto.write_pkt_line("want %s\n" % want)
107         self.proto.write_pkt_line(None)
108         have = graph_walker.next()
109         while have:
110             self.proto.write_pkt_line("have %s\n" % have)
111             if len(select.select([self.fileno], [], [], 0)[0]) > 0:
112                 pkt = self.proto.read_pkt_line()
113                 parts = pkt.rstrip("\n").split(" ")
114                 if parts[0] == "ACK":
115                     graph_walker.ack(parts[1])
116                     assert parts[2] == "continue"
117             have = graph_walker.next()
118         self.proto.write_pkt_line("done\n")
119         pkt = self.proto.read_pkt_line()
120         while pkt:
121             parts = pkt.rstrip("\n").split(" ")
122             if parts[0] == "ACK":
123                 graph_walker.ack(pkt.split(" ")[1])
124             if len(parts) < 3 or parts[2] != "continue":
125                 break
126             pkt = self.proto.read_pkt_line()
127         for pkt in self.proto.read_pkt_seq():
128             channel = ord(pkt[0])
129             pkt = pkt[1:]
130             if channel == 1:
131                 pack_data(pkt)
132             elif channel == 2:
133                 progress(pkt)
134             else:
135                 raise AssertionError("Invalid sideband channel %d" % channel)
136
137
138 class TCPGitClient(GitClient):
139
140     def __init__(self, host, port=TCP_GIT_PORT):
141         self._socket = socket.socket(type=socket.SOCK_STREAM)
142         self._socket.connect((host, port))
143         self.rfile = self._socket.makefile('rb', -1)
144         self.wfile = self._socket.makefile('wb', 0)
145         self.host = host
146         super(TCPGitClient, self).__init__(self._socket.fileno(), self.rfile.read, self.wfile.write)
147
148     def send_pack(self, path):
149         self.proto.send_cmd("git-receive-pack", path, "host=%s" % self.host)
150         super(TCPGitClient, self).send_pack(path)
151
152     def fetch_pack(self, path, determine_wants, graph_walker, pack_data, progress):
153         self.proto.send_cmd("git-upload-pack", path, "host=%s" % self.host)
154         super(TCPGitClient, self).fetch_pack(path, determine_wants, graph_walker, pack_data, progress)