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This is just the first step in attempting to make all network connection have timeouts as a "safe default". TCP keepalives only protect against certain classes of network and host issues (e.g. server/OS crash), but do nothing against application-level issues (e.g. an application that accepts connections but then fails to serve requests). The actual keep-alive duration (15s) is chosen to cause broken connections to be closed after 2~3 minutes (depending on the OS, see #23549 for details). We don't make the actual default value part of the public API for a number of reasons: - because it's not very useful by itself: as discussed in #23549 the actual "timeout" after which the connection is torn down is duration*(KEEPCNT+1), and we use the OS-wide value for KEEPCNT because there's currently no way to set it from Go. - because it may change in the future: if users need to rely on a specific value they should explicitly set this value instead of relying on the default. Fixes #23459 Change-Id: I348c03be97588d5001e6de0f377e7a93b51957fd Reviewed-on: https://go-review.googlesource.com/c/107196 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
27 lines
628 B
Go
27 lines
628 B
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package net
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import (
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"context"
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"time"
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)
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var (
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// if non-nil, overrides dialTCP.
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testHookDialTCP func(ctx context.Context, net string, laddr, raddr *TCPAddr) (*TCPConn, error)
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testHookHostsPath = "/etc/hosts"
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testHookLookupIP = func(
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ctx context.Context,
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fn func(context.Context, string, string) ([]IPAddr, error),
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network string,
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host string,
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) ([]IPAddr, error) {
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return fn(ctx, network, host)
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}
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testHookSetKeepAlive = func(time.Duration) {}
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)
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