Reading from a tcp connection in golang

Question

In a statement like bytes_read, err := conn.Read(tmp), I wish the read be attempted for x seconds and if no read begins I want the code to proceed ahead check some connections and again loop back and try to read. I could use select-case and spawn two goroutines, one attempting the read and the other for timeout. But here, in case of timeout happening first the code will go ahead, check the conditions and again spawn a routine to try to read from the connection while the previous read routines is still alive. I wish that the previous routine dies when timeout takes place.

Any suggestion on how I can proceed?

Maybe what u need is only the SetReadDeadline for conn. if netErr, ok := err.(net.Error); ok && netErr.Timeout() doSomething — Justlike
– Justlike, Commented Jan 20, 2016 at 6:50
@Justlike Thanks! Thats what I need. But can you help me with the syntax. I am using err2 := conn.SetReadDeadline(time.Now().Add(5 * time.Second)) | bytes_read, err := conn.Read(tmp) | err.Timeout() which results in the error that err.Timeout undefined (type error has no field or method Timeout). I want to check whether Timeout() is true or false — user3740387
– user3740387, Commented Jan 20, 2016 at 8:20

Justlike · Accepted Answer · 2016-01-20 08:53:14Z

23

Hope this can help u. ^_^

for {
    // set SetReadDeadline
    err := conn.SetReadDeadline(time.Now().Add(5 * time.Second))
    if err != nil {
        log.Println("SetReadDeadline failed:", err)
        // do something else, for example create new conn
        return
    }

    recvBuf := make([]byte, 1024)

    n, err = conn.Read(recvBuf[:]) // recv data
    if err != nil {
        if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
            log.Println("read timeout:", err)
            // time out
        } else {
            log.Println("read error:", err)
            // some error else, do something else, for example create new conn
        }
    }
}

answered Jan 20, 2016 at 8:53

Justlike

1,51410 silver badges18 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Reading from a tcp connection in golang

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related