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()
 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)