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/
unit.go
141 lines (124 loc) · 3.55 KB
/
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 (
"strings"
"time"
etcd "github.com/coreos/etcd/client"
"golang.org/x/net/context"
"github.com/coreos/fleet/log"
"github.com/coreos/fleet/metrics"
"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,
}
start := time.Now()
_, err = r.kAPI.Set(context.Background(), key, val, opts)
// unit is already stored
if isEtcdError(err, etcd.ErrorCodeNodeExist) {
// TODO(jonboulle): verify more here?
err = nil
}
if err != nil {
metrics.ReportRegistryOpFailure(metrics.Set)
return
}
metrics.ReportRegistryOpSuccess(metrics.Set, start)
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,
}
start := time.Now()
resp, err := r.kAPI.Get(context.Background(), key, opts)
if err != nil {
if isEtcdError(err, etcd.ErrorCodeKeyNotFound) {
err = nil
}
metrics.ReportRegistryOpFailure(metrics.Get)
return nil
}
metrics.ReportRegistryOpSuccess(metrics.Get, start)
return r.unitFromEtcdNode(hash, resp.Node)
}
// getAllUnitsHashMap retrieves from the Registry all Units and returns a map of hash to UnitFile
func (r *EtcdRegistry) getAllUnitsHashMap() (map[string]*unit.UnitFile, error) {
key := r.prefixed(unitPrefix)
opts := &etcd.GetOptions{
Recursive: true,
Quorum: true,
}
hashToUnit := map[string]*unit.UnitFile{}
start := time.Now()
resp, err := r.kAPI.Get(context.Background(), key, opts)
if err != nil {
metrics.ReportRegistryOpFailure(metrics.GetAll)
return nil, err
}
metrics.ReportRegistryOpSuccess(metrics.GetAll, start)
for _, node := range resp.Node.Nodes {
parts := strings.Split(node.Key, "/")
if len(parts) == 0 {
log.Errorf("key '%v' doesn't have enough parts", node.Key)
continue
}
stringHash := parts[len(parts)-1]
hash, err := unit.HashFromHexString(stringHash)
if err != nil {
log.Errorf("failed to get Hash for key '%v' with stringHash '%v': %v", node.Key, stringHash, err)
continue
}
unit := r.unitFromEtcdNode(hash, node)
if unit == nil {
continue
}
hashToUnit[stringHash] = unit
}
return hashToUnit, nil
}
func (r *EtcdRegistry) unitFromEtcdNode(hash unit.Hash, etcdNode *etcd.Node) *unit.UnitFile {
var um unitModel
if err := unmarshal(etcdNode.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
}