"""

Hook to log changesets pushed and pulled

"""

from mercurial.i18n import _

import mercurial.util

import mercurial.node

import os

import time

import fcntl

try: 

    import json

except ImportError: 

    import simplejson as json

from mercurialserver import ruleset, changes

def hook(ui, repo, hooktype, node=None, source=None, **kwargs):

    if hooktype == 'changegroup':

        op = "push"

    elif hooktype == 'outgoing':

        op = "pull"

    else:

        raise mercurial.util.Abort(_('servelog installed as wrong hook type,'

            ' must be changegroup or outgoing but is %s') % hooktype)

    log = open(repo.join("mercurial-server.log"), "a+")

    try:

        fcntl.flock(log.fileno(), fcntl.LOCK_EX)

        log.seek(0, os.SEEK_END)

        # YAML log file format

        log.write("- %s\n" % json.dumps(dict(

            timestamp=time.strftime("%Y-%m-%d_%H:%M:%S Z", time.gmtime()),

            op=op,

            key=ruleset.rules.get('user'),

            ssh_connection=os.environ['SSH_CONNECTION'],

            nodes=[mercurial.node.hex(ctx.node())

                for ctx in changes.changes(repo, node)],

         )))

    finally:

        log.close()