зеркало из https://github.com/github/vitess-gh.git
83 строки
2.2 KiB
Python
83 строки
2.2 KiB
Python
#!/usr/bin/env python
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# Copyright 2017 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""The abstract class for choosing topo server."""
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import logging
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class TopoServer(object):
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"""Base class that defines the required interface."""
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def setup(self):
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"""Initialize the topo server."""
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raise NotImplementedError()
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def teardown(self):
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"""Teardown the topo server."""
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raise NotImplementedError()
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def flags(self):
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"""Return a list of args that tell a Vitess process to use this topo server.
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"""
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raise NotImplementedError()
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def wipe(self):
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"""Wipe the Vitess paths in the topo server."""
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raise NotImplementedError()
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def update_addr(self, cell, keyspace, shard, tablet_index, port):
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"""Update topo server with additional information."""
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raise NotImplementedError()
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def flavor(self):
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"""Return the name of this topo server flavor."""
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return self.flavor_name
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flavor_map = {}
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_server = None
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def topo_server():
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return _server
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def set_topo_server_flavor(flavor):
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"""Set which topo server to use."""
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global _server
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if flavor in flavor_map:
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_server = flavor_map[flavor]
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logging.debug("Using topo server flavor '%s'", flavor)
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elif not flavor:
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if len(flavor_map) == 1:
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(flavor, _server) = flavor_map.iteritems().next()
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logging.debug("Using default topo server flavor '%s'", flavor)
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else:
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logging.error(
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"No --topo-server-flavor specified. Registered flavors: [%s]",
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",".join(flavor_map.keys()))
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return
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else:
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logging.error(
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"Unknown topo server flavor '%s'. Registered flavors: [%s]", flavor,
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",".join(flavor_map.keys()))
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return
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_server.flavor_name = flavor
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