# __init__.py - inotify-based status acceleration for Linux

#

# Copyright 2006, 2007, 2008 Bryan O'Sullivan <bos@serpentine.com>

# Copyright 2007, 2008 Brendan Cully <brendan@kublai.com>

#

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

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

'''inotify-based status acceleration for Linux systems

'''

# todo: socket permissions

from mercurial.i18n import _

from mercurial import cmdutil, util

import client, errno, os, server, socket

from weakref import proxy

def serve(ui, repo, **opts):

    '''start an inotify server for this repository'''

    timeout = opts.get('timeout')

    if timeout:

        timeout = float(timeout) * 1e3

    class service:

        def init(self):

            try:

                self.master = server.Master(ui, repo, timeout)

            except server.AlreadyStartedException, inst:

                raise util.Abort(str(inst))

        def run(self):

            try:

                self.master.run()

            finally:

                self.master.shutdown()

    service = service()

    cmdutil.service(opts, initfn=service.init, runfn=service.run)

def reposetup(ui, repo):

        return

    # XXX: weakref until hg stops relying on __del__

    repo = proxy(repo)

    class inotifydirstate(repo.dirstate.__class__):

        # Set to True if we're the inotify server, so we don't attempt

        # to recurse.

        inotifyserver = False

        def status(self, match, ignored, clean, unknown=True):

            files = match.files()

            if '.' in files:

                files = []

            try:

                if not ignored and not self.inotifyserver:

                    result = client.query(ui, repo, files, match, False,

                                          clean, unknown)

                    if ui.config('inotify', 'debug'):

                        r2 = super(inotifydirstate, self).status(

                            match, False, clean, unknown)

                        for c,a,b in zip('LMARDUIC', result, r2):

                            for f in a:

                                if f not in b:

                                    ui.warn('*** inotify: %s +%s\n' % (c, f))

                            for f in b:

                                if f not in a:

                                    ui.warn('*** inotify: %s -%s\n' % (c, f))

                        result = r2

                    if result is not None:

                        return result

            except (OSError, socket.error), err:

                autostart = ui.configbool('inotify', 'autostart', True)

                if err[0] == errno.ECONNREFUSED:

                    ui.warn(_('(found dead inotify server socket; '

                                   'removing it)\n'))

                    os.unlink(repo.join('inotify.sock'))

                if err[0] in (errno.ECONNREFUSED, errno.ENOENT) and autostart:

                    query = None

                    ui.debug(_('(starting inotify server)\n'))

                    try:

                        try:

                            server.start(ui, repo)

                            query = client.query

                        except server.AlreadyStartedException, inst:

                            # another process may have started its own

                            # inotify server while this one was starting.

                            ui.debug(str(inst))

                            query = client.query

                    except Exception, inst:

                        ui.warn(_('could not start inotify server: '

                                       '%s\n') % inst)

                    if query:

                        try:

                            return query(ui, repo, files or [], match,

                                         ignored, clean, unknown)

                        except socket.error, err:

                            ui.warn(_('could not talk to new inotify '

                                           'server: %s\n') % err[-1])

                elif err[0] in (errno.ECONNREFUSED, errno.ENOENT):

                    # silently ignore normal errors if autostart is False

                    ui.debug(_('(inotify server not running)\n'))

                else:

                    ui.warn(_('failed to contact inotify server: %s\n')

                             % err[-1])

                ui.print_exc()

                # replace by old status function

                self.status = super(inotifydirstate, self).status

            return super(inotifydirstate, self).status(

                match, ignored, clean, unknown)

    repo.dirstate.__class__ = inotifydirstate

cmdtable = {

    '^inserve':

    (serve,

     [('d', 'daemon', None, _('run server in background')),

      ('', 'daemon-pipefds', '', _('used internally by daemon mode')),

      ('t', 'idle-timeout', '', _('minutes to sit idle before exiting')),

      ('', 'pid-file', '', _('name of file to write process ID to'))],

     _('hg inserve [OPT]...')),

    }