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task_srv.go
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task_srv.go
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package etcd
import (
"context"
"encoding/json"
"fmt"
"log"
"strconv"
"time"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/mvcc/mvccpb"
"github.com/luoruofeng/gobasicproj/common"
c "github.com/luoruofeng/gobasicproj/master/config"
"github.com/luoruofeng/gobasicproj/master/task_srv"
)
// 任务管理器
type TaskSrv struct {
client *clientv3.Client
kv clientv3.KV
lease clientv3.Lease
}
var (
EtcdTaskSrv *TaskSrv
)
// 初始化管理器
func InitEtcdTaskSrv() error {
var (
config clientv3.Config
client *clientv3.Client
kv clientv3.KV
lease clientv3.Lease
)
// 初始化配置
config = clientv3.Config{
Endpoints: c.Cnf.EtcdAddrs, // 集群地址
DialTimeout: time.Duration(c.Cnf.EtcdDialTimeout) * time.Millisecond, // 连接超时
}
// 建立连接
client, err := clientv3.New(config)
if err != nil {
return err
} else {
log.Println("GEt ETCD client!", c.Cnf.EtcdAddrs)
}
//test connect
cxt, _ := context.WithTimeout(context.TODO(), 5*time.Second)
_, err = client.Get(cxt, "test_key")
if err != nil {
log.Println("connect to ETCD failed!")
return err
} else {
log.Println("etcd connect successfully!")
}
// 得到KV和Lease的API子集
kv = clientv3.NewKV(client)
lease = clientv3.NewLease(client)
// 赋值单例
EtcdTaskSrv = &TaskSrv{
client: client,
kv: kv,
lease: lease,
}
return nil
}
// 关闭连接
func (t *TaskSrv) CloseTaskSrv() error {
log.Println("close etcd server connection!")
return t.client.Close()
}
// 保存任务
func (t *TaskSrv) SaveTask(task *task_srv.Task) (oldTask *task_srv.Task, err error) {
// 把任务保存到 / gobasicproj //任务id -> json
var (
taskKey string
taskValue []byte
putResp *clientv3.PutResponse
oldTaskObj task_srv.Task
)
// etcd的保存key
taskKey = common.TaskSaveDir + strconv.FormatUint(task.Id, 10)
// 任务信息json
if taskValue, err = json.Marshal(task); err != nil {
return
}
// 保存到etcd
if putResp, err = t.kv.Put(context.TODO(), taskKey, string(taskValue), clientv3.WithPrevKV()); err != nil {
return
}
// 如果是更新, 那么返回旧值
if putResp.PrevKv != nil {
// 对旧值做一个反序列化
if err = json.Unmarshal(putResp.PrevKv.Value, &oldTaskObj); err != nil {
err = nil
return
}
oldTask = &oldTaskObj
}
return
}
// 获取全部任务
func (t *TaskSrv) GetAllTask() (allTask []*task_srv.Task, err error) {
var (
getResp *clientv3.GetResponse
kvPair *mvccpb.KeyValue
task *task_srv.Task
)
if getResp, err = t.kv.Get(context.TODO(), common.TaskSaveDir, clientv3.WithPrefix()); err != nil {
return
}
log.Println(getResp)
allTask = make([]*task_srv.Task, 0)
for _, kvPair = range getResp.Kvs {
task = &task_srv.Task{}
if err = json.Unmarshal(kvPair.Value, task); err != nil {
err = nil
continue
}
allTask = append(allTask, task)
}
log.Println(allTask)
return
}
// 通过id获取任务
func (t *TaskSrv) GetTaskById(taskId uint64) (rt *task_srv.Task, err error) {
var (
getResp *clientv3.GetResponse
kvPair *mvccpb.KeyValue
task *task_srv.Task
)
id := common.TaskSaveDir + strconv.FormatUint(taskId, 10)
if getResp, err = t.kv.Get(context.TODO(), id); err != nil {
return
}
if len(getResp.Kvs) <= 0 {
err = fmt.Errorf("id:%v is not exsits in ETCD", taskId)
return
}
kvPair = getResp.Kvs[0]
task = &task_srv.Task{}
if err = json.Unmarshal(kvPair.Value, task); err != nil {
return
}
rt = task
log.Println(rt)
return
}
// 删除任务
func (t *TaskSrv) DeleteTask(id uint64) (oldTask *task_srv.Task, err error) {
var (
taskKey string
delResp *clientv3.DeleteResponse
oldTaskObj task_srv.Task
)
// etcd中保存任务的key
taskKey = common.TaskSaveDir + strconv.FormatUint(id, 10)
// 从etcd中删除它
if delResp, err = t.kv.Delete(context.TODO(), taskKey, clientv3.WithPrevKV()); err != nil {
return
}
// 返回被删除的任务信息
if len(delResp.PrevKvs) != 0 {
// 解析一下旧值, 返回它
if err = json.Unmarshal(delResp.PrevKvs[0].Value, &oldTaskObj); err != nil {
err = nil
return
}
oldTask = &oldTaskObj
}
return
}