# sshserver.py - ssh protocol server support for mercurial

#

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

#

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

# of the GNU General Public License, incorporated herein by reference.

from demandload import demandload

from i18n import gettext as _

from node import *

demandload(globals(), "sys util")

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

        sys.stdout = sys.stderr

        # Prevent insertion/deletion of CRs

        util.set_binary(self.fin)

        util.set_binary(self.fout)

    def getarg(self):

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

        arg, l = argline.split()

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

        return arg, val

    def respond(self, v):

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

        self.fout.write(v)

        self.fout.flush()

    def serve_forever(self):

        while self.serve_one(): pass

        sys.exit(0)

    def serve_one(self):

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

        if cmd:

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

            if impl: impl()

            else: self.respond("")

        return cmd != ''

    def do_heads(self):

        h = self.repo.heads()

        self.respond(" ".join(map(hex, h)) + "\n")

    def do_hello(self):

        '''the hello command returns a set of lines describing various

        interesting things about the server, in an RFC822-like format.

        Currently the only one defined is "capabilities", which

        consists of a line in the form:

        capabilities: space separated list of tokens

        '''

        r = "capabilities:\n"

        self.respond(r)

    def do_lock(self):

        self.lock = self.repo.lock()

        self.respond("")

    def do_unlock(self):

        if self.lock:

            self.lock.release()

        self.lock = None

        self.respond("")

    def do_branches(self):

        arg, nodes = self.getarg()

        nodes = map(bin, nodes.split(" "))

        r = []

        for b in self.repo.branches(nodes):

            r.append(" ".join(map(hex, b)) + "\n")

        self.respond("".join(r))

    def do_between(self):

        arg, pairs = self.getarg()

        pairs = [map(bin, p.split("-")) for p in pairs.split(" ")]

        r = []

        for b in self.repo.between(pairs):

            r.append(" ".join(map(hex, b)) + "\n")

        self.respond("".join(r))

    def do_changegroup(self):

        nodes = []

        arg, roots = self.getarg()

        nodes = map(bin, roots.split(" "))

        cg = self.repo.changegroup(nodes, 'serve')

        while True:

            d = cg.read(4096)

            if not d:

                break

            self.fout.write(d)

        self.fout.flush()

    def do_addchangegroup(self):

        if not self.lock:

            self.respond("not locked")

            return

        self.respond("")

        r = self.repo.addchangegroup(self.fin, 'serve')

        self.respond(str(r))