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lib/osutil/ping.go
40 строк
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Jakob Borg
lib/dialer: Preserve nilness in error handling (fixes #6368) (#6369)
26 фев 2020, 15:16
Не верифицирован
26 фев 2020, 15:16
4e4b9a8
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// 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 err == 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) }