聊聊rocketmqclientgo的ACLInterceptor

编程

本文主要研究一下rocketmq-client-go的ACLInterceptor

ACLInterceptor

rocketmq-client-go-v2.0.0/internal/remote/interceptor.go

func ACLInterceptor(credentials primitive.Credentials) primitive.Interceptor {

return func(ctx context.Context, req, reply interface{}, next primitive.Invoker) error {

cmd := req.(*RemotingCommand)

m := make(map[string]string)

order := make([]string, 1)

m[accessKey] = credentials.AccessKey

order[0] = accessKey

if credentials.SecurityToken != "" {

m[securityToken] = credentials.SecurityToken

}

for k, v := range cmd.ExtFields {

m[k] = v

order = append(order, k)

}

sort.Slice(order, func(i, j int) bool {

return strings.Compare(order[i], order[j]) < 0

})

content := ""

for idx := range order {

content += m[order[idx]]

}

buf := make([]byte, len(content)+len(cmd.Body))

copy(buf, []byte(content))

copy(buf[len(content):], cmd.Body)

cmd.ExtFields[signature] = calculateSignature(buf, []byte(credentials.SecretKey))

cmd.ExtFields[accessKey] = credentials.AccessKey

// The SecurityToken value is unnecessary, user can choose this one.

if credentials.SecurityToken != "" {

cmd.ExtFields[securityToken] = credentials.SecurityToken

}

err := next(ctx, req, reply)

return err

}

}

  • ACLInterceptor方法会调用calculateSignature计算签名,然后执行next

calculateSignature

rocketmq-client-go-v2.0.0/internal/remote/interceptor.go

func calculateSignature(data, sk []byte) string {

mac := hmac.New(func() hash.Hash {

return sha1.New()

}, sk)

mac.Write(data)

return base64.StdEncoding.EncodeToString(mac.Sum(nil))

}

  • calculateSignature方法通过base64来将mac.Sum的结果编码为string

SetCredentials

rocketmq-client-go-v2.0.0/internal/namesrv.go

func (s *namesrvs) SetCredentials(credentials primitive.Credentials) {

s.nameSrvClient.RegisterInterceptor(remote.ACLInterceptor(credentials))

}

  • namesrv的SetCredentials方法执行的是s.nameSrvClient.RegisterInterceptor(remote.ACLInterceptor(credentials))

RegisterInterceptor

rocketmq-client-go-v2.0.0/internal/remote/remote_client.go

func (c *remotingClient) RegisterInterceptor(interceptors ...primitive.Interceptor) {

c.interceptor = primitive.ChainInterceptors(interceptors...)

}

  • RegisterInterceptor方法主要是执行primitive.ChainInterceptors

ChainInterceptors

rocketmq-client-go-v2.0.0/primitive/interceptor.go

func ChainInterceptors(interceptors ...Interceptor) Interceptor {

if len(interceptors) == 0 {

return nil

}

if len(interceptors) == 1 {

return interceptors[0]

}

return func(ctx context.Context, req, reply interface{}, invoker Invoker) error {

return interceptors[0](ctx, req, reply, getChainedInterceptor(interceptors, 0, invoker))

}

}

  • ChainInterceptors方法会执行getChainedInterceptor

getChainedInterceptor

rocketmq-client-go-v2.0.0/primitive/interceptor.go

func getChainedInterceptor(interceptors []Interceptor, cur int, finalInvoker Invoker) Invoker {

if cur == len(interceptors)-1 {

return finalInvoker

}

return func(ctx context.Context, req, reply interface{}) error {

return interceptors[cur+1](ctx, req, reply, getChainedInterceptor(interceptors, cur+1, finalInvoker))

}

}

  • getChainedInterceptor方法递归执行getChainedInterceptor(interceptors, cur+1, finalInvoker)直到cur == len(interceptors)-1

小结

ACLInterceptor方法会调用calculateSignature计算签名,然后执行next;calculateSignature方法通过base64来将mac.Sum的结果编码为string

doc

  • interceptor

以上是 聊聊rocketmqclientgo的ACLInterceptor 的全部内容, 来源链接: utcz.com/z/518158.html

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