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unit.go
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unit.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 (
etcd "github.com/coreos/fleet/Godeps/_workspace/src/github.com/coreos/etcd/client"
"github.com/coreos/fleet/log"
"github.com/coreos/fleet/unit"
)
const (
unitPrefix = "/unit/"
)
func (r *EtcdRegistry) storeOrGetUnitFile(u unit.UnitFile) (err error) {
um := unitModel{
Raw: u.String(),
}
val, err := marshal(um)
if err != nil {
return err
}
key := r.hashedUnitPath(u.Hash())
opts := &etcd.SetOptions{
PrevExist: etcd.PrevNoExist,
}
_, err = r.kAPI.Set(r.ctx(), key, val, opts)
// unit is already stored
if isEtcdError(err, etcd.ErrorCodeNodeExist) {
// TODO(jonboulle): verify more here?
err = nil
}
return
}
// getUnitByHash retrieves from the Registry the Unit associated with the given Hash
func (r *EtcdRegistry) getUnitByHash(hash unit.Hash) *unit.UnitFile {
key := r.hashedUnitPath(hash)
opts := &etcd.GetOptions{
Recursive: true,
}
resp, err := r.kAPI.Get(r.ctx(), key, opts)
if err != nil {
if isEtcdError(err, etcd.ErrorCodeKeyNotFound) {
err = nil
}
return nil
}
var um unitModel
if err := unmarshal(resp.Node.Value, &um); err != nil {
log.Errorf("error unmarshaling Unit(%s): %v", hash, err)
return nil
}
u, err := unit.NewUnitFile(um.Raw)
if err != nil {
log.Errorf("error parsing Unit(%s): %v", hash, err)
return nil
}
return u
}
func (r *EtcdRegistry) hashedUnitPath(hash unit.Hash) string {
return r.prefixed(unitPrefix, hash.String())
}
type unitModel struct {
Raw string
}