# sshserver.py - ssh protocol server support for mercurial

#

# Copyright 2005-2007 Matt Mackall <mpm@selenic.com>

# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>

#

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

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

import util, hook, wireproto, changegroup

import os, sys

class sshserver(object):

    def __init__(self, ui, repo):

        self.ui = ui

        self.repo = repo

        self.lock = None

        self.fin = sys.stdin

        self.fout = sys.stdout

        hook.redirect(True)

        sys.stdout = sys.stderr

        # Prevent insertion/deletion of CRs

        util.set_binary(self.fin)

        util.set_binary(self.fout)

    def getargs(self, args):

        data = {}

        keys = args.split()

        count = len(keys)

        for n in xrange(len(keys)):

            argline = self.fin.readline()[:-1]

            arg, l = argline.split()

            val = self.fin.read(int(l))

            if arg not in keys:

                raise util.Abort("unexpected parameter %r" % arg)

            if arg == '*':

                star = {}

                for n in xrange(int(l)):

                    arg, l = argline.split()

                    val = self.fin.read(int(l))

                    star[arg] = val

                data['*'] = star

            else:

                data[arg] = val

        return [data[k] for k in keys]

    def getarg(self, name):

        return self.getargs(name)[0]

    def getfile(self, fpout):

        self.sendresponse('')

        count = int(self.fin.readline())

        while count:

            fpout.write(self.fin.read(count))

            count = int(self.fin.readline())

    def redirect(self):

        pass

    def groupchunks(self, changegroup):

        while True:

            d = changegroup.read(4096)

            if not d:

                break

            yield d

    def sendresponse(self, v):

        self.fout.write("%d\n" % len(v))

        self.fout.write(v)

        self.fout.flush()

    def sendstream(self, source):

        for chunk in source.gen:

            self.fout.write(chunk)

        self.fout.flush()

    def sendpushresponse(self, rsp):

        self.sendresponse('')

        self.sendresponse(str(rsp.res))

    def sendpusherror(self, rsp):

        self.sendresponse(rsp.res)

    def serve_forever(self):

        try:

            while self.serve_one():

                pass

        finally:

            if self.lock is not None:

                self.lock.release()

        sys.exit(0)

    handlers = {

        str: sendresponse,

        wireproto.streamres: sendstream,

        wireproto.pushres: sendpushresponse,

        wireproto.pusherr: sendpusherror,

    }

    def serve_one(self):

        cmd = self.fin.readline()[:-1]

        if cmd and cmd in wireproto.commands:

            rsp = wireproto.dispatch(self.repo, self, cmd)

            self.handlers[rsp.__class__](self, rsp)

        elif cmd:

            impl = getattr(self, 'do_' + cmd, None)

            if impl:

                r = impl()

                if r is not None:

                    self.sendresponse(r)

            else: self.sendresponse("")

        return cmd != ''

    def do_lock(self):

        '''DEPRECATED - allowing remote client to lock repo is not safe'''

        self.lock = self.repo.lock()

        return ""

    def do_unlock(self):

        '''DEPRECATED'''

        if self.lock:

            self.lock.release()

        self.lock = None

        return ""

    def do_addchangegroup(self):

        '''DEPRECATED'''

        if not self.lock:

            self.sendresponse("not locked")

            return

        self.sendresponse("")

        cg = changegroup.unbundle10(self.fin, "UN")

        r = self.repo.addchangegroup(cg, 'serve', self._client(),

                                     lock=self.lock)

        return str(r)

    def _client(self):

        client = os.environ.get('SSH_CLIENT', '').split(' ', 1)[0]

        return 'remote:ssh:' + client