syncthing/lib/osutil/ping.go
Simon Frei 1bae4b7f50 all: Use context in lib/dialer (#6177)
* all: Use context in lib/dialer

* a bit slimmer

* https://github.com/syncthing/syncthing/pull/5753

* bot

* missed adding debug.go

* errors.Cause

* simultaneous dialing

* anti-leak
2019-11-26 07:39:51 +00:00

41 lines
1.1 KiB
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 https://mozilla.org/MPL/2.0/.
package osutil
import (
"context"
"net/url"
"time"
"github.com/syncthing/syncthing/lib/dialer"
)
// TCPPing returns the duration required to establish a TCP connection
// to the given host. ICMP packets require root privileges, hence why we use
// tcp.
func TCPPing(ctx context.Context, address string) (time.Duration, error) {
start := time.Now()
ctx, cancel := context.WithTimeout(ctx, time.Second)
defer cancel()
conn, err := dialer.DialContext(ctx, "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(ctx context.Context, addr string) (time.Duration, error) {
uri, err := url.Parse(addr)
if err != nil {
return 0, err
}
return TCPPing(ctx, uri.Host)
}