# narrowwirepeer.py - passes narrow spec with unbundle command

#

# Copyright 2017 Google, Inc.

#

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

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

from __future__ import absolute_import

from mercurial import (

    bundle2,

    error,

    extensions,

    hg,

    match as matchmod,

    narrowspec,

    pycompat,

    wireprototypes,

    wireprotov1peer,

    wireprotov1server,

)

def uisetup():

    extensions.wrapfunction(wireprotov1server, '_capabilities', addnarrowcap)

    wireprotov1peer.wirepeer.narrow_widen = peernarrowwiden

def addnarrowcap(orig, repo, proto):

    """add the narrow capability to the server"""

    caps = orig(repo, proto)

    if repo.ui.configbool('experimental', 'narrowservebrokenellipses'):

    return caps

def reposetup(repo):

    def wirereposetup(ui, peer):

        def wrapped(orig, cmd, *args, **kwargs):

            if cmd == 'unbundle':

                # TODO: don't blindly add include/exclude wireproto

                # arguments to unbundle.

                include, exclude = repo.narrowpats

                kwargs[r"includepats"] = ','.join(include)

                kwargs[r"excludepats"] = ','.join(exclude)

            return orig(cmd, *args, **kwargs)

        extensions.wrapfunction(peer, '_calltwowaystream', wrapped)

    hg.wirepeersetupfuncs.append(wirereposetup)

@wireprotov1server.wireprotocommand('narrow_widen', 'oldincludes oldexcludes'

                                                    ' newincludes newexcludes'

                                                    ' commonheads cgversion'

                                                    ' known ellipses',

                                    permission='pull')

def narrow_widen(repo, proto, oldincludes, oldexcludes, newincludes,

                 newexcludes, commonheads, cgversion, known, ellipses):

    """wireprotocol command to send data when a narrow clone is widen. We will

    be sending a changegroup here.

    The current set of arguments which are required:

    oldincludes: the old includes of the narrow copy

    oldexcludes: the old excludes of the narrow copy

    newincludes: the new includes of the narrow copy

    newexcludes: the new excludes of the narrow copy

    commonheads: list of heads which are common between the server and client

    cgversion(maybe): the changegroup version to produce

    known: list of nodes which are known on the client (used in ellipses cases)

    ellipses: whether to send ellipses data or not

    """

    try:

        oldincludes = wireprototypes.decodelist(oldincludes)

        newincludes = wireprototypes.decodelist(newincludes)

        oldexcludes = wireprototypes.decodelist(oldexcludes)

        newexcludes = wireprototypes.decodelist(newexcludes)

        # validate the patterns

        narrowspec.validatepatterns(set(oldincludes))

        narrowspec.validatepatterns(set(newincludes))

        narrowspec.validatepatterns(set(oldexcludes))

        narrowspec.validatepatterns(set(newexcludes))

        common = wireprototypes.decodelist(commonheads)

        known = None

        if known:

            known = wireprototypes.decodelist(known)

        if ellipses == '0':

            ellipses = False

        else:

            ellipses = bool(ellipses)

        cgversion = cgversion

        newmatch = narrowspec.match(repo.root, include=newincludes,

                                    exclude=newexcludes)

        oldmatch = narrowspec.match(repo.root, include=oldincludes,

                                    exclude=oldexcludes)

        diffmatch = matchmod.differencematcher(newmatch, oldmatch)

        bundler = bundle2.widen_bundle(repo, diffmatch, common, known,

                                             cgversion, ellipses)

    except error.Abort as exc:

        bundler = bundle2.bundle20(repo.ui)

        manargs = [('message', pycompat.bytestr(exc))]

        advargs = []

        if exc.hint is not None:

            advargs.append(('hint', exc.hint))

        bundler.addpart(bundle2.bundlepart('error:abort', manargs, advargs))

    chunks = bundler.getchunks()

    return wireprototypes.streamres(gen=chunks)

def peernarrowwiden(remote, **kwargs):

    for ch in ('oldincludes', 'newincludes', 'oldexcludes', 'newexcludes',

               'commonheads', 'known'):

        kwargs[ch] = wireprototypes.encodelist(kwargs[ch])

    kwargs['ellipses'] = '%i' % bool(kwargs['ellipses'])

    f = remote._callcompressable('narrow_widen', **kwargs)

    return bundle2.getunbundler(remote.ui, f)