mirror of
https://github.com/facebook/sapling.git
synced 2024-10-07 07:17:55 +03:00
b66cd482a9
There are places in the code that use localrepository.baseui (see hg.remoteui), we need the ui descriptors (and possibly other things) to be set correctly on it, so output written to the remoteui descriptors ends up at the right place. Before this change, tests such as 'test-bookmarks-pushpull.t' didn't work.
230 lines
6.2 KiB
Python
230 lines
6.2 KiB
Python
# commandserver.py - communicate with Mercurial's API over a pipe
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#
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# Copyright Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from i18n import _
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import struct
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import sys
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import dispatch, encoding, util
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logfile = None
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def log(*args):
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if not logfile:
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return
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for a in args:
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logfile.write(str(a))
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logfile.flush()
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class channeledoutput(object):
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"""
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Write data from in_ to out in the following format:
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data length (unsigned int),
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data
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"""
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def __init__(self, in_, out, channel):
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self.in_ = in_
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self.out = out
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self.channel = channel
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def write(self, data):
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if not data:
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return
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self.out.write(struct.pack('>cI', self.channel, len(data)))
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self.out.write(data)
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self.out.flush()
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def __getattr__(self, attr):
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if attr in ('isatty', 'fileno'):
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raise AttributeError, attr
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return getattr(self.in_, attr)
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class channeledinput(object):
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"""
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Read data from in_.
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Requests for input are written to out in the following format:
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channel identifier - 'I' for plain input, 'L' line based (1 byte)
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how many bytes to send at most (unsigned int),
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The client replies with:
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data length (unsigned int), 0 meaning EOF
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data
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"""
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maxchunksize = 4 * 1024
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def __init__(self, in_, out, channel):
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self.in_ = in_
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self.out = out
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self.channel = channel
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def read(self, size=-1):
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if size < 0:
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# if we need to consume all the clients input, ask for 4k chunks
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# so the pipe doesn't fill up risking a deadlock
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size = self.maxchunksize
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s = self._read(size, self.channel)
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buf = s
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while s:
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s = self._read(size, self.channel)
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buf += s
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return buf
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else:
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return self._read(size, self.channel)
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def _read(self, size, channel):
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if not size:
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return ''
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assert size > 0
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# tell the client we need at most size bytes
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self.out.write(struct.pack('>cI', channel, size))
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self.out.flush()
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length = self.in_.read(4)
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length = struct.unpack('>I', length)[0]
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if not length:
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return ''
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else:
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return self.in_.read(length)
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def readline(self, size=-1):
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if size < 0:
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size = self.maxchunksize
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s = self._read(size, 'L')
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buf = s
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# keep asking for more until there's either no more or
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# we got a full line
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while s and s[-1] != '\n':
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s = self._read(size, 'L')
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buf += s
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return buf
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else:
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return self._read(size, 'L')
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def __iter__(self):
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return self
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def next(self):
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l = self.readline()
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if not l:
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raise StopIteration
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return l
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def __getattr__(self, attr):
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if attr in ('isatty', 'fileno'):
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raise AttributeError, attr
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return getattr(self.in_, attr)
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class server(object):
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"""
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Listens for commands on stdin, runs them and writes the output on a channel
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based stream to stdout.
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"""
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def __init__(self, ui, repo, mode):
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self.ui = ui
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logpath = ui.config("cmdserver", "log", None)
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if logpath:
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global logfile
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if logpath == '-':
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# write log on a special 'd'ebug channel
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logfile = channeledoutput(sys.stdout, sys.stdout, 'd')
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else:
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logfile = open(logpath, 'a')
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self.repo = repo
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self.repoui = repo.ui
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if mode == 'pipe':
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self.cerr = channeledoutput(sys.stderr, sys.stdout, 'e')
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self.cout = channeledoutput(sys.stdout, sys.stdout, 'o')
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self.cin = channeledinput(sys.stdin, sys.stdout, 'I')
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self.cresult = channeledoutput(sys.stdout, sys.stdout, 'r')
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self.client = sys.stdin
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else:
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raise util.Abort(_('unknown mode %s') % mode)
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def _read(self, size):
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if not size:
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return ''
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data = self.client.read(size)
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# is the other end closed?
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if not data:
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raise EOFError()
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return data
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def runcommand(self):
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""" reads a list of \0 terminated arguments, executes
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and writes the return code to the result channel """
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length = struct.unpack('>I', self._read(4))[0]
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if not length:
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args = []
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else:
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args = self._read(length).split('\0')
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# copy the uis so changes (e.g. --config or --verbose) don't
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# persist between requests
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copiedui = self.ui.copy()
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self.repo.baseui = copiedui
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self.repo.ui = self.repo.dirstate._ui = self.repoui.copy()
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req = dispatch.request(args, copiedui, self.repo, self.cin,
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self.cout, self.cerr)
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ret = dispatch.dispatch(req) or 0 # might return None
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self.cresult.write(struct.pack('>i', int(ret)))
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def getencoding(self):
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""" writes the current encoding to the result channel """
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self.cresult.write(encoding.encoding)
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def serveone(self):
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cmd = self.client.readline()[:-1]
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if cmd:
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handler = self.capabilities.get(cmd)
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if handler:
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handler(self)
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else:
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# clients are expected to check what commands are supported by
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# looking at the servers capabilities
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raise util.Abort(_('unknown command %s') % cmd)
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return cmd != ''
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capabilities = {'runcommand' : runcommand,
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'getencoding' : getencoding}
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def serve(self):
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hellomsg = 'capabilities: ' + ' '.join(self.capabilities.keys())
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hellomsg += '\n'
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hellomsg += 'encoding: ' + encoding.encoding
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# write the hello msg in -one- chunk
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self.cout.write(hellomsg)
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try:
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while self.serveone():
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pass
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except EOFError:
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# we'll get here if the client disconnected while we were reading
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# its request
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return 1
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return 0
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