# 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 mercurial.i18n import _

from mercurial.utils import stringutil

from mercurial import (

    bundle2,

    error,

    exchange,

    extensions,

    hg,

    narrowspec,

    wireprototypes,

    wireprotov1peer,

    wireprotov1server,

)

from . import narrowbundle2

def uisetup():

    wireprotov1peer.wirepeer.narrow_widen = peernarrowwiden

def reposetup(repo):

    def wirereposetup(ui, peer):

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

            if cmd == b'unbundle':

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

                # arguments to unbundle.

                include, exclude = repo.narrowpats

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

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

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

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

    hg.wirepeersetupfuncs.append(wirereposetup)

@wireprotov1server.wireprotocommand(

    b'narrow_widen',

    b'oldincludes oldexcludes'

    b' newincludes newexcludes'

    b' commonheads cgversion'

    b' known ellipses',

    permission=b'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

    """

    preferuncompressed = False

    try:

        def splitpaths(data):

            # work around ''.split(',') => ['']

            return data.split(b',') if data else []

        oldincludes = set(splitpaths(oldincludes))

        newincludes = set(splitpaths(newincludes))

        oldexcludes = set(splitpaths(oldexcludes))

        newexcludes = set(splitpaths(newexcludes))

        # enforce narrow acl if set

        if repo.ui.has_section(exchange._NARROWACL_SECTION):

            kwargs = exchange.applynarrowacl(

                repo, {'includepats': newincludes, 'excludepats': newexcludes}

            )

            newincludes = kwargs['includepats']

            requiredexcludes = kwargs['excludepats'] - newexcludes

            if requiredexcludes:

                # XXX: The below code to get the username was copied from exchange.py,

                # where it is noted that this is technically a layering violation for

                # assuming the existence of HTTP. Using it anyway to make the error

                # message consistent with the error message for invalid includes.

                ui = repo.ui

                username = ui.shortuser(

                    ui.environ.get(b'REMOTE_USER') or ui.username()

                )

                raise error.Abort(

                    _(b"The following excludes cannot be removed for %s: %s")

                    % (username, stringutil.pprint(list(requiredexcludes)))

                )

            newexcludes = kwargs['excludepats']

        # validate the patterns

        narrowspec.validatepatterns(oldincludes)

        narrowspec.validatepatterns(newincludes)

        narrowspec.validatepatterns(oldexcludes)

        narrowspec.validatepatterns(newexcludes)

        common = wireprototypes.decodelist(commonheads)

        known = wireprototypes.decodelist(known)

        if ellipses == b'0':

            ellipses = False

        else:

            ellipses = bool(ellipses)

        cgversion = cgversion

        bundler = bundle2.bundle20(repo.ui)

        newmatch = narrowspec.match(

            repo.root, include=newincludes, exclude=newexcludes

        )

        oldmatch = narrowspec.match(

            repo.root, include=oldincludes, exclude=oldexcludes

        )

        if not ellipses:

            bundle2.widen_bundle(

                bundler,

                repo,

                oldmatch,

                newmatch,

                common,

                known,

                cgversion,

                ellipses,

            )

        else:

            narrowbundle2.generate_ellipses_bundle2_for_widening(

                bundler,

                repo,

                oldmatch,

                newmatch,

                cgversion,

                common,

                known,

            )

    except error.Abort as exc:

        bundler = bundle2.bundle20(repo.ui)

        manargs = [(b'message', exc.message)]

        advargs = []

        if exc.hint is not None:

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

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

        preferuncompressed = True

    chunks = bundler.getchunks()

    return wireprototypes.streamres(

        gen=chunks, prefer_uncompressed=preferuncompressed

    )

def peernarrowwiden(remote, **kwargs):

    for ch in ('commonheads', 'known'):

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

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

        kwargs[ch] = b','.join(kwargs[ch])

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

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

    return bundle2.getunbundler(remote.ui, f)