etcd-io__etcd/etcd/v2_store.go

/*
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 etcd

import (
	"encoding/json"
	"fmt"
	"time"

	"github.com/coreos/etcd/store"
)

type cmd struct {
	Type      string
	Key       string
	Value     string
	PrevValue string
	PrevIndex uint64
	Dir       bool
	Recursive bool
	Unique    bool
	Time      time.Time
}

func (p *participant) Set(key string, dir bool, value string, expireTime time.Time) (*store.Event, error) {
	set := &cmd{Type: "set", Key: key, Dir: dir, Value: value, Time: expireTime}
	return p.do(set)
}

func (p *participant) Create(key string, dir bool, value string, expireTime time.Time, unique bool) (*store.Event, error) {
	create := &cmd{Type: "create", Key: key, Dir: dir, Value: value, Time: expireTime, Unique: unique}
	return p.do(create)
}

func (p *participant) Update(key string, value string, expireTime time.Time) (*store.Event, error) {
	update := &cmd{Type: "update", Key: key, Value: value, Time: expireTime}
	return p.do(update)
}

func (p *participant) CAS(key, value, prevValue string, prevIndex uint64, expireTime time.Time) (*store.Event, error) {
	cas := &cmd{Type: "cas", Key: key, Value: value, PrevValue: prevValue, PrevIndex: prevIndex, Time: expireTime}
	return p.do(cas)
}

func (p *participant) Delete(key string, dir, recursive bool) (*store.Event, error) {
	d := &cmd{Type: "delete", Key: key, Dir: dir, Recursive: recursive}
	return p.do(d)
}

func (p *participant) CAD(key string, prevValue string, prevIndex uint64) (*store.Event, error) {
	cad := &cmd{Type: "cad", Key: key, PrevValue: prevValue, PrevIndex: prevIndex}
	return p.do(cad)
}

func (p *participant) do(c *cmd) (*store.Event, error) {
	data, err := json.Marshal(c)
	if err != nil {
		panic(err)
	}

	pp := v2Proposal{
		data: data,
		ret:  make(chan interface{}, 1),
	}

	select {
	case p.proposal <- pp:
	default:
		return nil, fmt.Errorf("unable to send out the proposal")
	}

	var ret interface{}
	select {
	case ret = <-pp.ret:
	case <-p.stopc:
		return nil, fmt.Errorf("stop serving")
	}

	switch t := ret.(type) {
	case *store.Event:
		return t, nil
	case error:
		return nil, t
	default:
		panic("server.do: unexpected return type")
	}
}