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