# sshrepo.py - ssh repository proxy class for mercurial

#

# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from i18n import _

import util, error, wireproto

import re

class remotelock(object):

    def __init__(self, repo):

        self.repo = repo

    def release(self):

        self.repo.unlock()

        self.repo = None

    def __del__(self):

        if self.repo:

            self.release()

class sshrepository(wireproto.wirerepository):

    def __init__(self, ui, path, create=0):

        self._url = path

        self.ui = ui

        m = re.match(r'^ssh://(([^@]+)@)?([^:/]+)(:(\d+))?(/(.*))?$', path)

        if not m:

            self._abort(error.RepoError(_("couldn't parse location %s") % path))

        self.user = m.group(2)

        self.host = m.group(3)

        self.port = m.group(5)

        self.path = m.group(7) or "."

        sshcmd = self.ui.config("ui", "ssh", "ssh")

        remotecmd = self.ui.config("ui", "remotecmd", "hg")

        args = util.sshargs(sshcmd, self.host, self.user, self.port)

        if create:

            cmd = '%s %s "%s init %s"'

            cmd = cmd % (sshcmd, args, remotecmd, self.path)

            ui.note(_('running %s\n') % cmd)

            res = util.system(cmd)

            if res != 0:

                self._abort(error.RepoError(_("could not create remote repo")))

        self.validate_repo(ui, sshcmd, args, remotecmd)

    def url(self):

        return self._url

    def validate_repo(self, ui, sshcmd, args, remotecmd):

        # cleanup up previous run

        self.cleanup()

        cmd = '%s %s "%s -R %s serve --stdio"'

        cmd = cmd % (sshcmd, args, remotecmd, self.path)

        cmd = util.quotecommand(cmd)

        ui.note(_('running %s\n') % cmd)

        self.pipeo, self.pipei, self.pipee = util.popen3(cmd)

        # skip any noise generated by remote shell

        self._callstream("hello")

        r = self._callstream("between", pairs=("%s-%s" % ("0"*40, "0"*40)))

        lines = ["", "dummy"]

        max_noise = 500

        while lines[-1] and max_noise:

            l = r.readline()

            self.readerr()

            if lines[-1] == "1\n" and l == "\n":

                break

            if l:

                ui.debug("remote: ", l)

            lines.append(l)

            max_noise -= 1

        else:

            self._abort(error.RepoError(_("no suitable response from remote hg")))

        self.capabilities = set()

        for l in reversed(lines):

            if l.startswith("capabilities:"):

                self.capabilities.update(l[:-1].split(":")[1].split())

                break

    def readerr(self):

        while 1:

            size = util.fstat(self.pipee).st_size

            if size == 0:

                break

            l = self.pipee.readline()

            if not l:

                break

            self.ui.status(_("remote: "), l)

    def _abort(self, exception):

        self.cleanup()

        raise exception

    def cleanup(self):

        try:

            self.pipeo.close()

            self.pipei.close()

            # read the error descriptor until EOF

            for l in self.pipee:

                self.ui.status(_("remote: "), l)

            self.pipee.close()

        except:

            pass

    __del__ = cleanup

    def _callstream(self, cmd, **args):

        self.ui.debug("sending %s command\n" % cmd)

        self.pipeo.write("%s\n" % cmd)

        for k, v in sorted(args.iteritems()):

            self.pipeo.write("%s %d\n" % (k, len(v)))

            self.pipeo.write(v)

        self.pipeo.flush()

        return self.pipei

    def _call(self, cmd, **args):

        self._callstream(cmd, **args)

        return self._recv()

    def _callpush(self, cmd, fp, **args):

        r = self._call(cmd, **args)

        if r:

            return '', r

        while 1:

            d = fp.read(4096)

            if not d:

                break

            self._send(d)

        self._send("", flush=True)

        r = self._recv()

        if r:

            return '', r

        return self._recv(), ''

    def _decompress(self, stream):

        return stream

    def _recv(self):

        l = self.pipei.readline()

        self.readerr()

        try:

            l = int(l)

        except:

            self._abort(error.ResponseError(_("unexpected response:"), l))

        return self.pipei.read(l)

    def _send(self, data, flush=False):

        self.pipeo.write("%d\n" % len(data))

        if data:

            self.pipeo.write(data)

        if flush:

            self.pipeo.flush()

        self.readerr()

    def lock(self):

        self._call("lock")

        return remotelock(self)

    def unlock(self):

        self._call("unlock")

    def addchangegroup(self, cg, source, url):

        '''Send a changegroup to the remote server.  Return an integer

        similar to unbundle(). DEPRECATED, since it requires locking the

        remote.'''

        d = self._call("addchangegroup")

        if d:

            self._abort(error.RepoError(_("push refused: %s") % d))

        while 1:

            d = cg.read(4096)

            if not d:

                break

            self.pipeo.write(d)

            self.readerr()

        self.pipeo.flush()

        self.readerr()

        r = self._recv()

        if not r:

            return 1

        try:

            return int(r)

        except:

            self._abort(error.ResponseError(_("unexpected response:"), r))

instance = sshrepository