如何通过HTTP实现谷歌的协议缓冲区

Question

我使用google的协议缓冲区将数据从客户端发送到服务器。

客户端和服务器都是用Golang编写的

我认为它使用纯tcp将数据从client发送到server。

示例客户端代码：

func getFakeTransaction() *proto.Transaction {
transaction := new(proto.Transaction)
transaction.ClientId = "client_1"
transaction.ClientName = "Europa"
items := new(proto.Items)
items.ItemId = 1
items.ItemName = "Space suite"
items.ItemValue = 2000
transaction.Items = items
return transaction
}
func readDataFromExternalDatasource() *proto.Transaction {
return getFakeTransaction()
}
func sentDataToServer(data []byte) {
conn, err := net.Dial("tcp", "localhost:8080")
defer conn.Close()
if err != nil {
fmt.Fprintf(os.Stderr, "Error while dialing server: %sn", err.Error())
return
}
sentBytes, err := conn.Write(data)
if err != nil {
fmt.Fprintf(os.Stderr, "Error sending bytes to serve: %sn", err.Error())
return
}
fmt.Printf("Sent %d bytesn", sentBytes)
}
func main() {
fmt.Println("Starting client..")
data := readDataFromExternalDatasource()
dataInByteArr, err := protoc.Marshal(data)
if err != nil {
fmt.Fprintf(os.Stderr, "Error while Marshal data: %s", err.Error())
}
for {
sentDataToServer(dataInByteArr)
time.Sleep(1000)
}
}

如何使用Golang中的协议缓冲区通过HTTP将数据从客户端发送到服务器？

Answer 1

I成功实现protobuff-vai http。

学分：https://jacobmartins.com/2016/05/24/practical-golang-using-protobuffs/

Sample_Client:

func getFakeTransaction() *proto.Transaction {
transaction := new(proto.Transaction)
transaction.ClientId = "client_1"
transaction.ClientName = "Europa"
items := new(proto.Items)
items.ItemId = 1
items.ItemName = "Space suite"
items.ItemValue = 2000
transaction.Items = items
return transaction
}
func sendMessage(transaction *proto.Transaction) {
message, err := protoc.Marshal(transaction)
if err != nil {
fmt.Fprintf(os.Stderr, "Error while marshaling message: %s", err.Error())
os.Exit(1)
}
_, err = http.Post("http://localhost:8080", "", bytes.NewBuffer(message))
if err != nil {
fmt.Fprintf(os.Stderr, "Error while post request to server: %s", err.Error())
os.Exit(1)
}
fmt.Printf("Sent %d bytes to servern", len(message))
}
func main() {
fmt.Println("Starting client..")
transaction := getFakeTransaction()
for {
sendMessage(transaction)
// time.Sleep(1 * time.Second)
}
}

示例服务器：

func printMessage(t *proto.Transaction) {
clientId := t.GetClientId()
clientName := t.GetClientName()
items := t.GetItems()
fmt.Printf("ClientId: %s, ClientName: %s, Items: %sn", clientId, clientName, items)
}
func main() {
fmt.Println("Staring server..")
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
message, err := ioutil.ReadAll(r.Body)
if err != nil {
fmt.Fprintf(os.Stderr, "Error while reading data from client: ", err.Error())
return
}
transaction := new(proto.Transaction)
// protoc.Unmarshal(message, &transaction)
if err = transaction.XXX_Unmarshal(message); err != nil {
fmt.Fprintf(os.Stderr, "Error while unmarshaling client message: %s", err.Error())
return
}
printMessage(transaction)
})
http.ListenAndServe(":8080", nil)
}

样本协议文件：

syntax="proto3";
package proto;
enum Status {
SUCCESS = 0;
INPROGRESS = 1;
FAILED = 2;
}
message Items {
int32 itemId = 1;
string itemName = 2;
int32 itemValue = 3;
Status status = 4;
}
message Transaction {
string clientId = 1;
string clientName = 2;
Items items = 3;
}