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machine.go
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machine.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 (
"path"
"strings"
"time"
"github.com/coreos/fleet/etcd"
"github.com/coreos/fleet/machine"
)
const (
machinePrefix = "machines"
)
func (r *EtcdRegistry) Machines() (machines []machine.MachineState, err error) {
req := etcd.Get{
Key: path.Join(r.keyPrefix, machinePrefix),
Sorted: true,
Recursive: true,
}
resp, err := r.etcd.Do(&req)
if err != nil {
if etcd.IsKeyNotFound(err) {
err = nil
}
return
}
for _, node := range resp.Node.Nodes {
for _, obj := range node.Nodes {
if !strings.HasSuffix(obj.Key, "/object") {
continue
}
var mach machine.MachineState
err = unmarshal(obj.Value, &mach)
if err != nil {
return
}
machines = append(machines, mach)
}
}
return
}
func (r *EtcdRegistry) SetMachineState(ms machine.MachineState, ttl time.Duration) (uint64, error) {
json, err := marshal(ms)
if err != nil {
return uint64(0), err
}
update := etcd.Update{
Key: path.Join(r.keyPrefix, machinePrefix, ms.ID, "object"),
Value: json,
TTL: ttl,
}
resp, err := r.etcd.Do(&update)
if err == nil {
return resp.Node.ModifiedIndex, nil
}
// If state was not present, explicitly create it so the other members
// in the cluster know this is a new member
create := etcd.Create{
Key: path.Join(r.keyPrefix, machinePrefix, ms.ID, "object"),
Value: json,
TTL: ttl,
}
resp, err = r.etcd.Do(&create)
if err != nil {
return uint64(0), err
}
return resp.Node.ModifiedIndex, nil
}
func (r *EtcdRegistry) RemoveMachineState(machID string) error {
req := etcd.Delete{
Key: path.Join(r.keyPrefix, machinePrefix, machID, "object"),
}
_, err := r.etcd.Do(&req)
if etcd.IsKeyNotFound(err) {
err = nil
}
return err
}