From 849ec4a2e76c089b1676be39ae54833b72d8a4c7 Mon Sep 17 00:00:00 2001 From: han-joker Date: Thu, 13 Apr 2023 21:50:54 +0800 Subject: [PATCH] service register middleware --- .gitignore | 42 +++++++++ discovery/register.go | 91 +++++++++++++++++++ discovery/services.go | 46 ++++++++++ discovery/services_test.go | 13 +++ go.mod | 23 +++++ go.sum | 178 +++++++++++++++++++++++++++++++++++++ test/putGet.go | 39 ++++++++ test/putGet_test.go | 7 ++ 8 files changed, 439 insertions(+) create mode 100644 .gitignore create mode 100644 discovery/register.go create mode 100644 discovery/services.go create mode 100644 discovery/services_test.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 test/putGet.go create mode 100644 test/putGet_test.go diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..9cd587c --- /dev/null +++ b/.gitignore @@ -0,0 +1,42 @@ +# Reference https://github.com/github/gitignore/blob/master/Go.gitignore +# Binaries for programs and plugins +*.exe +*.exe~ +*.dll +*.so +*.dylib + +# Test binary, built with `go test -c` +*.test + +# Output of the go coverage tool, specifically when used with LiteIDE +*.out + +# Dependency directories (remove the comment below to include it) +vendor/ + +# Go workspace file +go.work + +# Compiled Object files, Static and Dynamic libs (Shared Objects) +*.o +*.a +*.so + +# OS General +Thumbs.db +.DS_Store + +# project +*.cert +*.key +*.log +bin/ + +# Develop tools +.vscode/ +.idea/ +*.swp + +# volumes +data/ diff --git a/discovery/register.go b/discovery/register.go new file mode 100644 index 0000000..b064d2d --- /dev/null +++ b/discovery/register.go @@ -0,0 +1,91 @@ +package discovery + +import ( + "context" + "errors" + "github.com/google/uuid" + clientv3 "go.etcd.io/etcd/client/v3" + "log" + "time" +) + +// 服务注册的通用接口 +type Registrar interface { + // 注册服务 + Register(service Service) error + + // 注销服务 + DeRegister(service Service) error +} + +// 基于Etcd的服务发现中间件，实现Registrar +type RegistrarEtcd struct { + // 客户端信息 + cli *clientv3.Client + // 租约信息，基于租约来做健康监测 + leaseID clientv3.LeaseID + leaseTTL int64 +} + +const leaseTTL = 5 + +// 初始化方法 +// 实例化一个初始化了必要字段的数据 +func NewRegistrarEtcd(endpoints []string) (*RegistrarEtcd, error) { + // 一，没有etcd的地址，直接返回 + if len(endpoints) == 0 { + return nil, errors.New("endpoints is empty") + } + + // 二，连接etcd + cli, err := clientv3.New(clientv3.Config{ + Endpoints: endpoints, + DialTimeout: 3 * time.Second, + }) + if err != nil { + return nil, err + } + + // 三，初始化RegistrarEtcd + // 设置必要的属性 + re := &RegistrarEtcd{ + cli: cli, + leaseTTL: leaseTTL, + } + + // 返回对象 + return re, nil +} + +// 实现接口方法 +func (re *RegistrarEtcd) Register(service Service) error { + //一，租约的申请 lease grant + grantResp, err := re.cli.Grant(context.Background(), re.leaseTTL) + if err != nil { + return err + } + //grantResp.ID 就是租约ID + re.leaseID = grantResp.ID + + //二，将服务标识:服务地址 put到etcd中，同时绑定租约 + key := service.Name() + "-" + uuid.New().String() + _, err = re.cli.Put(context.Background(), key, service.Addr(), clientv3.WithLease(re.leaseID)) + if err != nil { + return err + } + + //三，租约续约 + _, err = re.cli.KeepAlive(context.Background(), re.leaseID) + if err != nil { + return err + } + + // log + log.Printf("service %s(%s) was registed \n", service.Name(), service.Addr()) + + return nil +} + +func (re *RegistrarEtcd) DeRegister(service Service) error { + return nil +} diff --git a/discovery/services.go b/discovery/services.go new file mode 100644 index 0000000..6a343ae --- /dev/null +++ b/discovery/services.go @@ -0,0 +1,46 @@ +package discovery + +import "log" + +// 服务的类型接口 +type Service interface { + Name() string + Addr() string +} + +// orderService +type OrderService struct { + name string + addr string +} + +func (s OrderService) Name() string { + return s.name +} + +func (s OrderService) Addr() string { + return s.addr +} + +func ServiceOrder(addr string) { + // 一：初始化orderService + orderService := OrderService{ + name: "order", + addr: addr, + } + + // 二：获取RegistrarEtcd + re, err := NewRegistrarEtcd([]string{"localhost:2379"}) // redis(6379) + if err != nil { + log.Fatalln(err) + } + + // 三：将初始化orderService注册到RegistrarEtcd中 + if err := re.Register(orderService); err != nil { + log.Fatalln(err) + } + + // 四：阻塞执行 + log.Printf("service %s(%s) is running", orderService.Name(), orderService.Addr()) + select {} +} diff --git a/discovery/services_test.go b/discovery/services_test.go new file mode 100644 index 0000000..da7501c --- /dev/null +++ b/discovery/services_test.go @@ -0,0 +1,13 @@ +package discovery + +import "testing" + +func TestServiceOrder1(t *testing.T) { + ServiceOrder("localhost:8080") +} +func TestServiceOrder2(t *testing.T) { + ServiceOrder("localhost:8081") +} +func TestServiceOrder3(t *testing.T) { + ServiceOrder("localhost:8082") +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..149f2cd --- /dev/null +++ b/go.mod @@ -0,0 +1,23 @@ +module serviceRegister + +go 1.20 + +require ( + github.com/coreos/go-semver v0.3.0 // indirect + github.com/coreos/go-systemd/v22 v22.3.2 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.2 // indirect + github.com/google/uuid v1.3.0 // indirect + go.etcd.io/etcd/api/v3 v3.5.7 // indirect + go.etcd.io/etcd/client/pkg/v3 v3.5.7 // indirect + go.etcd.io/etcd/client/v3 v3.5.7 // indirect + go.uber.org/atomic v1.7.0 // indirect + go.uber.org/multierr v1.6.0 // indirect + go.uber.org/zap v1.17.0 // indirect + golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4 // indirect + golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 // indirect + golang.org/x/text v0.3.5 // indirect + google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c // indirect + google.golang.org/grpc v1.41.0 // indirect + google.golang.org/protobuf v1.26.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..05b80e8 --- /dev/null +++ b/go.sum @@ -0,0 +1,178 @@ +cloud.google.com/go v0.26.0/go.mod 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0000000..31ea5d3 --- /dev/null +++ b/test/putGet.go @@ -0,0 +1,39 @@ +package test + +import ( + "context" + "fmt" + clientv3 "go.etcd.io/etcd/client/v3" + "log" + "time" +) + +func PutGet() { + // 1.连接etcd + // a. 实例化Etcd客户端 + // b. 给定连接信息 + cli, err := clientv3.New(clientv3.Config{ + // Etcd的endpoint + Endpoints: []string{"localhost:2379"}, + // 连接超时时长 + DialTimeout: 3 * time.Second, + }) + if err != nil { + log.Fatal(err) + } + + //context.Background() 默认的上下文环境 + // 2.put测试 + putResp, err := cli.Put(context.Background(), "testKey", "testValue") + if err != nil { + log.Fatal(err) + } + fmt.Println(putResp) + + // 3.get测试 + getResp, err := cli.Get(context.Background(), "testKey") + if err != nil { + log.Fatal(err) + } + fmt.Println(string(getResp.Kvs[0].Key), string(getResp.Kvs[0].Value)) +} diff --git a/test/putGet_test.go b/test/putGet_test.go new file mode 100644 index 0000000..e97102c --- /dev/null +++ b/test/putGet_test.go @@ -0,0 +1,7 @@ +package test + +import "testing" + +func TestPutGet(t *testing.T) { + PutGet() +}