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This fixes change https://go-review.googlesource.com/#/c/23069/, which assumes all DNS requests are UDP. This is not true -- DNS requests can be TCP in some cases. See: https://tip.golang.org/src/net/dnsclient_unix.go#L154 https://en.wikipedia.org/wiki/Domain_Name_System#Protocol_transport Also, the test code added by the above change doesn't actually test anything because the test uses a faked DNS resolver that doesn't actually make any DNS queries. I fixed that by adding another test that uses the system DNS resolver. Updates #12580 Change-Id: I6c24c03ebab84d437d3ac610fd6eb5353753c490 Reviewed-on: https://go-review.googlesource.com/23101 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
45 lines
1.8 KiB
Go
45 lines
1.8 KiB
Go
// Copyright 2016 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 nettrace contains internal hooks for tracing activity in
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// the net package. This package is purely internal for use by the
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// net/http/httptrace package and has no stable API exposed to end
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// users.
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package nettrace
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// TraceKey is a context.Context Value key. Its associated value should
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// be a *Trace struct.
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type TraceKey struct{}
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// LookupIPAltResolverKey is a context.Context Value key used by tests to
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// specify an alternate resolver func.
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// It is not exposed to outsider users. (But see issue 12503)
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// The value should be the same type as lookupIP:
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// func lookupIP(ctx context.Context, host string) ([]IPAddr, error)
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type LookupIPAltResolverKey struct{}
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// Trace contains a set of hooks for tracing events within
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// the net package. Any specific hook may be nil.
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type Trace struct {
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// DNSStart is called with the hostname of a DNS lookup
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// before it begins.
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DNSStart func(name string)
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// DNSDone is called after a DNS lookup completes (or fails).
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// The coalesced parameter is whether singleflight de-dupped
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// the call. The addrs are of type net.IPAddr but can't
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// actually be for circular dependency reasons.
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DNSDone func(netIPs []interface{}, coalesced bool, err error)
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// ConnectStart is called before a Dial, excluding Dials made
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// during DNS lookups. In the case of DualStack (Happy Eyeballs)
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// dialing, this may be called multiple times, from multiple
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// goroutines.
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ConnectStart func(network, addr string)
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// ConnectStart is called after a Dial with the results, excluding
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// Dials made during DNS lookups. It may also be called multiple
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// times, like ConnectStart.
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ConnectDone func(network, addr string, err error)
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}
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