I am using google's protocol buffers to send data from client to server.
Client and server both are written in Golang.
I think it uses plain tcp to send data from client to server.
Sample client code:
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: %s
", err.Error())
return
}
sentBytes, err := conn.Write(data)
if err != nil {
fmt.Fprintf(os.Stderr, "Error sending bytes to serve: %s
", err.Error())
return
}
fmt.Printf("Sent %d bytes
", 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)
}
}
How to send data from client to server via HTTP using protocol buffers in Golang?
I successfully implemented protobuff vai http.
Credits: 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 server
", len(message))
}
func main() {
fmt.Println("Starting client..")
transaction := getFakeTransaction()
for {
sendMessage(transaction)
// time.Sleep(1 * time.Second)
}
}
Sample Server:
func printMessage(t *proto.Transaction) {
clientId := t.GetClientId()
clientName := t.GetClientName()
items := t.GetItems()
fmt.Printf("ClientId: %s, ClientName: %s, Items: %s
", 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)
}
Sample Protofile:
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;
}