syncthing/lib/osutil/ping.go
2015-09-02 18:05:34 +01:00

40 lines
1010 B
Go

// Copyright (C) 2015 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
package osutil
import (
"net"
"net/url"
"time"
)
// TCPPing returns the duration required to establish a TCP connection
// to the given host. ICMP packets require root priviledges, hence why we use
// tcp.
func TCPPing(address string) (time.Duration, error) {
dialer := net.Dialer{
Deadline: time.Now().Add(time.Second),
}
start := time.Now()
conn, err := dialer.Dial("tcp", address)
if conn != nil {
conn.Close()
}
return time.Since(start), err
}
// GetLatencyForURL parses the given URL, tries opening a TCP connection to it
// and returns the time it took to establish the connection.
func GetLatencyForURL(addr string) (time.Duration, error) {
uri, err := url.Parse(addr)
if err != nil {
return 0, err
}
return TCPPing(uri.Host)
}