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manager_version.go
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/
manager_version.go
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// Copyright (c) 2014 Couchbase, Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the
// License. You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an "AS
// IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language
// governing permissions and limitations under the License.
package main
import (
log "github.com/couchbaselabs/clog"
)
// NOTE: You *must* update VERSION if you change what's stored in the
// Cfg (such as the JSON/struct definitions or planning algorithms).
const VERSION = "0.0.0"
const VERSION_KEY = "version"
// Returns true if a given version is modern enough to modify the Cfg.
// Older versions (which are running with older JSON/struct defintions
// or planning algorithms) will see false from their CheckVersion()'s.
func CheckVersion(cfg Cfg, myVersion string) (bool, error) {
for cfg != nil {
clusterVersion, cas, err := cfg.Get(VERSION_KEY, 0)
if err != nil {
return false, err
}
if clusterVersion == nil {
// First time initialization, so save myVersion to cfg and
// retry in case there was a race.
_, err = cfg.Set(VERSION_KEY, []byte(myVersion), cas)
if err != nil {
log.Printf("error: could not save VERSION to cfg, err: %v", err)
return false, err
}
continue
}
if VersionGTE(myVersion, string(clusterVersion)) == false {
return false, nil
}
if myVersion != string(clusterVersion) {
// Found myVersion is higher than clusterVersion so save
// myVersion to cfg and retry in case there was a race.
_, err = cfg.Set(VERSION_KEY, []byte(myVersion), cas)
if err != nil {
log.Printf("error: could not save VERSION to cfg, err: %v", err)
return false, err
}
continue
}
return true, nil
}
return false, nil
}