How TCP Client(golang) knows when data end if TCP Server(nodejs) send data without separator “n”












-1















My problem:



I'm trying to read the data sended by TCP server(nodejs)
but I can't, the server send the data without breakline "rn" or "n"



I'm new in Golang but I have been trying a lot of things to get all the data sended by server.



Code from Server.js, this a simple example



var net = require('net');

var server = net.createServer(function(socket) {
console.log("New Client")

socket.on('data', function(data){
console.log("data",data,data.toString())
socket.write("qweqweqkjwebqkjwhbekqjwbekjqbwkejhqwkjehqkwjehkqjwehkqjwhekjqhwekjhqwe")
})
socket.on('error', function(error){
console.error("Error:",error)
})
});

server.listen(4001, '127.0.0.1');


My code from golang



package main

import (
"bufio"
"fmt"
"io"
"log"
"net"
"time"
)

func main() {
conn, _ := net.Dial("tcp", "127.0.0.1:4001")

for {
fmt.Println("Send Text")
fmt.Fprintf(conn, "Hello")

// message, _ := bufio.NewReader(conn).ReadString('n')
// message, _ := bufio.NewReader(conn).ReadString('r')
message, _, _ := bufio.NewReader(conn).ReadLine() // how i know when data end if server doesn't send separator like "n" "r"
fmt.Println("Message from server: " + message)

time.Sleep(time.Second * 3)
}
}


Output from Client Golang:



Send Text


And that is all, the client(golang) is waiting for new line



Questions:



1.- There is a standard size of buffer in net(nodejs) ?

2.- How I can read the data sended by Server in golang without breakline? (there is no problem client and server in nodejs)

3.- I need to read byte by byte? and find x00 from buffer sended by Server(nodejs) ? (if this is the case how?)

4.- Server and Client in nodejs works with separator, but when they send data to the other one, in the other side separator is deleted?



I have teste this examples, but no one break the cicle for



reader := bufio.NewReader(conn)
// for {
// time.Sleep(time.Second * 3)
// // buff := make(byte, 4)
// test, _ := reader.ReadByte()
// fmt.Printf("%qn", test)
// fmt.Printf("%xn", test)
// }

// buf := make(byte, 1)
// for {
// n, err := reader.Read(buf)
// fmt.Println(n, err, buf[:n])
// if err == io.EOF {
// break
// }
// }

// buf := make(byte, 4)
// if _, err := io.ReadFull(reader, buf); err != nil {
// log.Fatal(err)
// }
// fmt.Println(string(buf))

buf, err := ioutil.ReadAll(reader)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(buf))









share|improve this question




















  • 1





    then how does your golang server understands the command is finished ?! its like asking a way to issue a command in terminal without pressing Enter. I think what you want is a websocket like protocol

    – danicheeta
    Nov 20 '18 at 7:04













  • @danicheeta then how Client and Server TCP in nodejs works?, If I execute socket.write(data) without separator("n") in the server(js), data go to on socket.on('data', function) in client side, and my questions is how can I emulate this with golang?

    – DarckBlezzer
    Nov 20 '18 at 16:27











  • it must append n under the hood. I havent checked that out but its logical to me

    – danicheeta
    Nov 20 '18 at 16:38
















-1















My problem:



I'm trying to read the data sended by TCP server(nodejs)
but I can't, the server send the data without breakline "rn" or "n"



I'm new in Golang but I have been trying a lot of things to get all the data sended by server.



Code from Server.js, this a simple example



var net = require('net');

var server = net.createServer(function(socket) {
console.log("New Client")

socket.on('data', function(data){
console.log("data",data,data.toString())
socket.write("qweqweqkjwebqkjwhbekqjwbekjqbwkejhqwkjehqkwjehkqjwehkqjwhekjqhwekjhqwe")
})
socket.on('error', function(error){
console.error("Error:",error)
})
});

server.listen(4001, '127.0.0.1');


My code from golang



package main

import (
"bufio"
"fmt"
"io"
"log"
"net"
"time"
)

func main() {
conn, _ := net.Dial("tcp", "127.0.0.1:4001")

for {
fmt.Println("Send Text")
fmt.Fprintf(conn, "Hello")

// message, _ := bufio.NewReader(conn).ReadString('n')
// message, _ := bufio.NewReader(conn).ReadString('r')
message, _, _ := bufio.NewReader(conn).ReadLine() // how i know when data end if server doesn't send separator like "n" "r"
fmt.Println("Message from server: " + message)

time.Sleep(time.Second * 3)
}
}


Output from Client Golang:



Send Text


And that is all, the client(golang) is waiting for new line



Questions:



1.- There is a standard size of buffer in net(nodejs) ?

2.- How I can read the data sended by Server in golang without breakline? (there is no problem client and server in nodejs)

3.- I need to read byte by byte? and find x00 from buffer sended by Server(nodejs) ? (if this is the case how?)

4.- Server and Client in nodejs works with separator, but when they send data to the other one, in the other side separator is deleted?



I have teste this examples, but no one break the cicle for



reader := bufio.NewReader(conn)
// for {
// time.Sleep(time.Second * 3)
// // buff := make(byte, 4)
// test, _ := reader.ReadByte()
// fmt.Printf("%qn", test)
// fmt.Printf("%xn", test)
// }

// buf := make(byte, 1)
// for {
// n, err := reader.Read(buf)
// fmt.Println(n, err, buf[:n])
// if err == io.EOF {
// break
// }
// }

// buf := make(byte, 4)
// if _, err := io.ReadFull(reader, buf); err != nil {
// log.Fatal(err)
// }
// fmt.Println(string(buf))

buf, err := ioutil.ReadAll(reader)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(buf))









share|improve this question




















  • 1





    then how does your golang server understands the command is finished ?! its like asking a way to issue a command in terminal without pressing Enter. I think what you want is a websocket like protocol

    – danicheeta
    Nov 20 '18 at 7:04













  • @danicheeta then how Client and Server TCP in nodejs works?, If I execute socket.write(data) without separator("n") in the server(js), data go to on socket.on('data', function) in client side, and my questions is how can I emulate this with golang?

    – DarckBlezzer
    Nov 20 '18 at 16:27











  • it must append n under the hood. I havent checked that out but its logical to me

    – danicheeta
    Nov 20 '18 at 16:38














-1












-1








-1








My problem:



I'm trying to read the data sended by TCP server(nodejs)
but I can't, the server send the data without breakline "rn" or "n"



I'm new in Golang but I have been trying a lot of things to get all the data sended by server.



Code from Server.js, this a simple example



var net = require('net');

var server = net.createServer(function(socket) {
console.log("New Client")

socket.on('data', function(data){
console.log("data",data,data.toString())
socket.write("qweqweqkjwebqkjwhbekqjwbekjqbwkejhqwkjehqkwjehkqjwehkqjwhekjqhwekjhqwe")
})
socket.on('error', function(error){
console.error("Error:",error)
})
});

server.listen(4001, '127.0.0.1');


My code from golang



package main

import (
"bufio"
"fmt"
"io"
"log"
"net"
"time"
)

func main() {
conn, _ := net.Dial("tcp", "127.0.0.1:4001")

for {
fmt.Println("Send Text")
fmt.Fprintf(conn, "Hello")

// message, _ := bufio.NewReader(conn).ReadString('n')
// message, _ := bufio.NewReader(conn).ReadString('r')
message, _, _ := bufio.NewReader(conn).ReadLine() // how i know when data end if server doesn't send separator like "n" "r"
fmt.Println("Message from server: " + message)

time.Sleep(time.Second * 3)
}
}


Output from Client Golang:



Send Text


And that is all, the client(golang) is waiting for new line



Questions:



1.- There is a standard size of buffer in net(nodejs) ?

2.- How I can read the data sended by Server in golang without breakline? (there is no problem client and server in nodejs)

3.- I need to read byte by byte? and find x00 from buffer sended by Server(nodejs) ? (if this is the case how?)

4.- Server and Client in nodejs works with separator, but when they send data to the other one, in the other side separator is deleted?



I have teste this examples, but no one break the cicle for



reader := bufio.NewReader(conn)
// for {
// time.Sleep(time.Second * 3)
// // buff := make(byte, 4)
// test, _ := reader.ReadByte()
// fmt.Printf("%qn", test)
// fmt.Printf("%xn", test)
// }

// buf := make(byte, 1)
// for {
// n, err := reader.Read(buf)
// fmt.Println(n, err, buf[:n])
// if err == io.EOF {
// break
// }
// }

// buf := make(byte, 4)
// if _, err := io.ReadFull(reader, buf); err != nil {
// log.Fatal(err)
// }
// fmt.Println(string(buf))

buf, err := ioutil.ReadAll(reader)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(buf))









share|improve this question
















My problem:



I'm trying to read the data sended by TCP server(nodejs)
but I can't, the server send the data without breakline "rn" or "n"



I'm new in Golang but I have been trying a lot of things to get all the data sended by server.



Code from Server.js, this a simple example



var net = require('net');

var server = net.createServer(function(socket) {
console.log("New Client")

socket.on('data', function(data){
console.log("data",data,data.toString())
socket.write("qweqweqkjwebqkjwhbekqjwbekjqbwkejhqwkjehqkwjehkqjwehkqjwhekjqhwekjhqwe")
})
socket.on('error', function(error){
console.error("Error:",error)
})
});

server.listen(4001, '127.0.0.1');


My code from golang



package main

import (
"bufio"
"fmt"
"io"
"log"
"net"
"time"
)

func main() {
conn, _ := net.Dial("tcp", "127.0.0.1:4001")

for {
fmt.Println("Send Text")
fmt.Fprintf(conn, "Hello")

// message, _ := bufio.NewReader(conn).ReadString('n')
// message, _ := bufio.NewReader(conn).ReadString('r')
message, _, _ := bufio.NewReader(conn).ReadLine() // how i know when data end if server doesn't send separator like "n" "r"
fmt.Println("Message from server: " + message)

time.Sleep(time.Second * 3)
}
}


Output from Client Golang:



Send Text


And that is all, the client(golang) is waiting for new line



Questions:



1.- There is a standard size of buffer in net(nodejs) ?

2.- How I can read the data sended by Server in golang without breakline? (there is no problem client and server in nodejs)

3.- I need to read byte by byte? and find x00 from buffer sended by Server(nodejs) ? (if this is the case how?)

4.- Server and Client in nodejs works with separator, but when they send data to the other one, in the other side separator is deleted?



I have teste this examples, but no one break the cicle for



reader := bufio.NewReader(conn)
// for {
// time.Sleep(time.Second * 3)
// // buff := make(byte, 4)
// test, _ := reader.ReadByte()
// fmt.Printf("%qn", test)
// fmt.Printf("%xn", test)
// }

// buf := make(byte, 1)
// for {
// n, err := reader.Read(buf)
// fmt.Println(n, err, buf[:n])
// if err == io.EOF {
// break
// }
// }

// buf := make(byte, 4)
// if _, err := io.ReadFull(reader, buf); err != nil {
// log.Fatal(err)
// }
// fmt.Println(string(buf))

buf, err := ioutil.ReadAll(reader)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(buf))






node.js go tcp






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 20 '18 at 16:57







DarckBlezzer

















asked Nov 20 '18 at 6:41









DarckBlezzerDarckBlezzer

1,9812028




1,9812028








  • 1





    then how does your golang server understands the command is finished ?! its like asking a way to issue a command in terminal without pressing Enter. I think what you want is a websocket like protocol

    – danicheeta
    Nov 20 '18 at 7:04













  • @danicheeta then how Client and Server TCP in nodejs works?, If I execute socket.write(data) without separator("n") in the server(js), data go to on socket.on('data', function) in client side, and my questions is how can I emulate this with golang?

    – DarckBlezzer
    Nov 20 '18 at 16:27











  • it must append n under the hood. I havent checked that out but its logical to me

    – danicheeta
    Nov 20 '18 at 16:38














  • 1





    then how does your golang server understands the command is finished ?! its like asking a way to issue a command in terminal without pressing Enter. I think what you want is a websocket like protocol

    – danicheeta
    Nov 20 '18 at 7:04













  • @danicheeta then how Client and Server TCP in nodejs works?, If I execute socket.write(data) without separator("n") in the server(js), data go to on socket.on('data', function) in client side, and my questions is how can I emulate this with golang?

    – DarckBlezzer
    Nov 20 '18 at 16:27











  • it must append n under the hood. I havent checked that out but its logical to me

    – danicheeta
    Nov 20 '18 at 16:38








1




1





then how does your golang server understands the command is finished ?! its like asking a way to issue a command in terminal without pressing Enter. I think what you want is a websocket like protocol

– danicheeta
Nov 20 '18 at 7:04







then how does your golang server understands the command is finished ?! its like asking a way to issue a command in terminal without pressing Enter. I think what you want is a websocket like protocol

– danicheeta
Nov 20 '18 at 7:04















@danicheeta then how Client and Server TCP in nodejs works?, If I execute socket.write(data) without separator("n") in the server(js), data go to on socket.on('data', function) in client side, and my questions is how can I emulate this with golang?

– DarckBlezzer
Nov 20 '18 at 16:27





@danicheeta then how Client and Server TCP in nodejs works?, If I execute socket.write(data) without separator("n") in the server(js), data go to on socket.on('data', function) in client side, and my questions is how can I emulate this with golang?

– DarckBlezzer
Nov 20 '18 at 16:27













it must append n under the hood. I havent checked that out but its logical to me

– danicheeta
Nov 20 '18 at 16:38





it must append n under the hood. I havent checked that out but its logical to me

– danicheeta
Nov 20 '18 at 16:38












1 Answer
1






active

oldest

votes


















0














It's about TCP data transfer, usually in this case you should define a protocol for your data to define how much byte will be send and usually a separator for end of packet. for example



[n-Bytes for data lenght][data][separator bytes]


In fact, ReadLine also uses this method but only with separator






share|improve this answer
























  • but how a server and client TCP in nodejs know when data ends if there isn't a "separator byte" in the data that I send?

    – DarckBlezzer
    Nov 20 '18 at 16:19











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









0














It's about TCP data transfer, usually in this case you should define a protocol for your data to define how much byte will be send and usually a separator for end of packet. for example



[n-Bytes for data lenght][data][separator bytes]


In fact, ReadLine also uses this method but only with separator






share|improve this answer
























  • but how a server and client TCP in nodejs know when data ends if there isn't a "separator byte" in the data that I send?

    – DarckBlezzer
    Nov 20 '18 at 16:19
















0














It's about TCP data transfer, usually in this case you should define a protocol for your data to define how much byte will be send and usually a separator for end of packet. for example



[n-Bytes for data lenght][data][separator bytes]


In fact, ReadLine also uses this method but only with separator






share|improve this answer
























  • but how a server and client TCP in nodejs know when data ends if there isn't a "separator byte" in the data that I send?

    – DarckBlezzer
    Nov 20 '18 at 16:19














0












0








0







It's about TCP data transfer, usually in this case you should define a protocol for your data to define how much byte will be send and usually a separator for end of packet. for example



[n-Bytes for data lenght][data][separator bytes]


In fact, ReadLine also uses this method but only with separator






share|improve this answer













It's about TCP data transfer, usually in this case you should define a protocol for your data to define how much byte will be send and usually a separator for end of packet. for example



[n-Bytes for data lenght][data][separator bytes]


In fact, ReadLine also uses this method but only with separator







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 20 '18 at 7:09









Milad AghamohammadiMilad Aghamohammadi

851516




851516













  • but how a server and client TCP in nodejs know when data ends if there isn't a "separator byte" in the data that I send?

    – DarckBlezzer
    Nov 20 '18 at 16:19



















  • but how a server and client TCP in nodejs know when data ends if there isn't a "separator byte" in the data that I send?

    – DarckBlezzer
    Nov 20 '18 at 16:19

















but how a server and client TCP in nodejs know when data ends if there isn't a "separator byte" in the data that I send?

– DarckBlezzer
Nov 20 '18 at 16:19





but how a server and client TCP in nodejs know when data ends if there isn't a "separator byte" in the data that I send?

– DarckBlezzer
Nov 20 '18 at 16:19




















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