Created
March 28, 2025 17:15
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Testing net.DialTCP and net.TCPConn
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| // testing against socat: | |
| // socat -u TCP-LISTEN:5555,reuseaddr,fork STDOUT | |
| package main | |
| import ( | |
| "fmt" | |
| "net" | |
| "time" | |
| ) | |
| func main() { | |
| addr, err := net.ResolveTCPAddr("tcp4", "127.0.0.1:5555") | |
| if err != nil { | |
| panic(err) | |
| } | |
| dialer := func() (*net.TCPConn, error) { | |
| conn, err := net.DialTCP("tcp", nil, addr) | |
| if conn != nil { | |
| err = conn.SetKeepAlive(true) | |
| if err != nil { | |
| fmt.Printf("Unable to set keepalive - %s", err) | |
| } | |
| } else if err != nil { | |
| fmt.Printf("Unable to dial - %s", err) | |
| } | |
| return conn, err | |
| } | |
| conn, _ := dialer() | |
| pending := []string{} | |
| for i := range 30 { | |
| m := fmt.Sprintf("index=%02d phase=HelloTCP\n", i) | |
| if conn == nil { | |
| fmt.Println("No connection, re-dialing after 3 secs") | |
| time.Sleep(3 * time.Second) | |
| conn, err = dialer() | |
| if err != nil { | |
| fmt.Printf("Unable to re-dial- %s", err) | |
| pending = append(pending, m) | |
| continue | |
| } | |
| } | |
| conn.SetWriteDeadline(time.Now().Add(100 * time.Millisecond)) | |
| n, err := conn.Write([]byte(m)) | |
| if err != nil { | |
| fmt.Printf("Error writing message: %s idx: %d len: %d\n", err, i, n) | |
| conn.Close() | |
| conn = nil | |
| pending = append(pending, m) | |
| } else { | |
| fmt.Println("Sent message idx", i, "bytes", n) | |
| } | |
| time.Sleep(3 * time.Second) | |
| } | |
| time.Sleep(1 * time.Second) | |
| fmt.Println("App finished. Pending messages", pending) | |
| } |
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