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#!/usr/bin/env python
# encoding: utf-8
"""
Handler for replica with multiple master nodes.
Can only handle initial copy from one master. Add other masters with
expect-sync option.
NB! needs merge_on_time function to be compiled on database first.
"""
import skytools
from londiste.handlers.applyfn import ApplyFuncHandler
from londiste.handlers import update
__all__ = ['MultimasterHandler']
class MultimasterHandler(ApplyFuncHandler):
__doc__ = __doc__
handler_name = 'multimaster'
def __init__(self, table_name, args, dest_table):
"""Init per-batch table data cache."""
conf = args.copy()
# remove Multimaster args from conf
for name in ['func_name','func_conf']:
if name in conf:
conf.pop(name)
conf = skytools.db_urlencode(conf)
args = update(args, {'func_name': 'merge_on_time', 'func_conf': conf})
ApplyFuncHandler.__init__(self, table_name, args, dest_table)
def _check_args (self, args):
pass # any arg can be passed
def add(self, trigger_arg_list):
"""Create SKIP and BEFORE INSERT trigger"""
trigger_arg_list.append('no_merge')
#------------------------------------------------------------------------------
# register handler class
#------------------------------------------------------------------------------
__londiste_handlers__ = [MultimasterHandler]
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