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registry.go
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/
registry.go
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/*
Copyright 2014 CoreOS, 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 registry
import (
"encoding/json"
"fmt"
"github.com/coreos/fleet/etcd"
)
const DefaultKeyPrefix = "/_coreos.com/fleet/"
// EtcdRegistry fulfils the Registry interface and uses etcd as a backend
type EtcdRegistry struct {
etcd etcd.Client
keyPrefix string
}
func NewEtcdRegistry(client etcd.Client, keyPrefix string) *EtcdRegistry {
return &EtcdRegistry{client, keyPrefix}
}
func marshal(obj interface{}) (string, error) {
encoded, err := json.Marshal(obj)
if err == nil {
return string(encoded), nil
}
return "", fmt.Errorf("unable to JSON-serialize object: %s", err)
}
func unmarshal(val string, obj interface{}) error {
err := json.Unmarshal([]byte(val), &obj)
if err == nil {
return nil
}
return fmt.Errorf("unable to JSON-deserialize object: %s", err)
}
func isKeyNotFound(err error) bool {
e, ok := err.(etcd.Error)
return ok && e.ErrorCode == etcd.ErrorKeyNotFound
}
func isNodeExist(err error) bool {
e, ok := err.(etcd.Error)
return ok && e.ErrorCode == etcd.ErrorNodeExist
}