操作Etcd
这里使用官方的etcd/clientv3 (opens new window)包来连接 etcd 并进行相关操作。
# 安装
go get go.etcd.io/etcd/clientv3
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# put 和 get 操作
put命令用来设置键值对数据，get命令用来根据 key 获取值。
package main
import (
"context"
"fmt"
"time"
"go.etcd.io/etcd/clientv3"
)
func main(){
cli, err := clientv3.New(clientv3.Config{
Endpoints: []string{"122.51.79.172:2379"},
DialTimeout: 5 * time.Second,
})
if err != nil {
// handle error!
fmt.Printf("connect to etcd failed, err:%v\n", err)
return
}
fmt.Println("connect to etcd success")
defer cli.Close()
// put
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
_, err = cli.Put(ctx, "coolops", "test")
cancel()
if err != nil {
fmt.Printf("put to etcd failed, err:%v\n", err)
return
}
// get
ctx, cancel = context.WithTimeout(context.Background(), time.Second)
resp, err := cli.Get(ctx, "coolops")
cancel()
if err != nil {
fmt.Printf("get from etcd failed, err:%v\n", err)
return
}
for _, ev := range resp.Kvs {
fmt.Printf("%s:%s\n", ev.Key, ev.Value)
}
}
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# watch 操作
watch用来获取未来更改的通知。
package main
import (
"context"
"fmt"
"time"
"go.etcd.io/etcd/clientv3"
)
func main(){
cli, err := clientv3.New(clientv3.Config{
Endpoints: []string{"122.51.79.172:2379"},
DialTimeout: 5 * time.Second,
})
if err != nil {
// handle error!
fmt.Printf("connect to etcd failed, err:%v\n", err)
return
}
fmt.Println("connect to etcd success")
defer cli.Close()
// watch 操作，返回的是一个通道
rch := cli.Watch(context.Background(), "coolops") // <-chan WatchResponse
for wresp := range rch {
for _, ev := range wresp.Events {
fmt.Printf("Type: %s Key:%s Value:%s\n", ev.Type, ev.Kv.Key, ev.Kv.Value)
}
}
}
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# 安装报错：
go: finding github.com/coreos/pkg latest
# github.com/coreos/etcd/clientv3/balancer/resolver/endpoint
E:\DEV\Go\pkg\mod\github.com\coreos\etcd@v3.3.19+incompatible\clientv3\balancer\resolver\endpoint\endpoint.go:114:78: undefined: resolver.BuildOption
E:\DEV\Go\pkg\mod\github.com\coreos\etcd@v3.3.19+incompatible\clientv3\balancer\resolver\endpoint\endpoint.go:182:31: undefined: resolver.ResolveNowOption
# github.com/coreos/etcd/clientv3/balancer/picker
E:\DEV\Go\pkg\mod\github.com\coreos\etcd@v3.3.19+incompatible\clientv3\balancer\picker\err.go:37:44: undefined: balancer.PickOptions
E:\DEV\Go\pkg\mod\github.com\coreos\etcd@v3.3.19+incompatible\clientv3\balancer\picker\roundrobin_balanced.go:55:54: undefined: balancer.PickOptions
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解决：
将 go.mod 里的 prpc 改为 1.26.0 版本
google.golang.org/grpc v1.26.0
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上次更新: 2025/07/18, 11:04:43
