1 // Copyright 2016 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
21 func TestBuffers_read(t *testing.T) {
22 const story = "once upon a time in Gopherland ... "
29 []byte("Gopherland ... "),
31 got, err := ioutil.ReadAll(&buffers)
35 if string(got) != story {
36 t.Errorf("read %q; want %q", got, story)
38 if len(buffers) != 0 {
39 t.Errorf("len(buffers) = %d; want 0", len(buffers))
43 func TestBuffers_consume(t *testing.T) {
50 in: Buffers{[]byte("foo"), []byte("bar")},
52 want: Buffers{[]byte("foo"), []byte("bar")},
55 in: Buffers{[]byte("foo"), []byte("bar")},
57 want: Buffers{[]byte("o"), []byte("bar")},
60 in: Buffers{[]byte("foo"), []byte("bar")},
62 want: Buffers{[]byte("bar")},
65 in: Buffers{[]byte("foo"), []byte("bar")},
67 want: Buffers{[]byte("ar")},
70 in: Buffers{nil, nil, nil, []byte("bar")},
72 want: Buffers{[]byte("ar")},
75 in: Buffers{nil, nil, nil, []byte("foo")},
77 want: Buffers{[]byte("foo")},
80 in: Buffers{nil, nil, nil},
85 for i, tt := range tests {
87 in.consume(tt.consume)
88 if !reflect.DeepEqual(in, tt.want) {
89 t.Errorf("%d. after consume(%d) = %+v, want %+v", i, tt.consume, in, tt.want)
94 func TestBuffers_WriteTo(t *testing.T) {
95 for _, name := range []string{"WriteTo", "Copy"} {
96 for _, size := range []int{0, 10, 1023, 1024, 1025} {
97 t.Run(fmt.Sprintf("%s/%d", name, size), func(t *testing.T) {
98 testBuffer_writeTo(t, size, name == "Copy")
104 func testBuffer_writeTo(t *testing.T, chunks int, useCopy bool) {
105 oldHook := poll.TestHookDidWritev
106 defer func() { poll.TestHookDidWritev = oldHook }()
107 var writeLog struct {
111 poll.TestHookDidWritev = func(size int) {
113 writeLog.log = append(writeLog.log, size)
116 var want bytes.Buffer
117 for i := 0; i < chunks; i++ {
118 want.WriteByte(byte(i))
121 withTCPConnPair(t, func(c *TCPConn) error {
122 buffers := make(Buffers, chunks)
123 for i := range buffers {
124 buffers[i] = want.Bytes()[i : i+1]
129 n, err = io.Copy(c, &buffers)
131 n, err = buffers.WriteTo(c)
136 if len(buffers) != 0 {
137 return fmt.Errorf("len(buffers) = %d; want 0", len(buffers))
139 if n != int64(want.Len()) {
140 return fmt.Errorf("Buffers.WriteTo returned %d; want %d", n, want.Len())
143 }, func(c *TCPConn) error {
144 all, err := ioutil.ReadAll(c)
145 if !bytes.Equal(all, want.Bytes()) || err != nil {
146 return fmt.Errorf("client read %q, %v; want %q, nil", all, err, want.Bytes())
149 writeLog.Lock() // no need to unlock
151 for _, v := range writeLog.log {
156 switch runtime.GOOS {
157 case "android", "darwin", "dragonfly", "freebsd", "linux", "netbsd", "openbsd":
165 if len(writeLog.log) < wantMinCalls {
166 t.Errorf("write calls = %v < wanted min %v", len(writeLog.log), wantMinCalls)
172 wantCalls = 1 // windows will always do 1 syscall, unless sending empty buffer
174 if len(writeLog.log) != wantCalls {
175 t.Errorf("write calls = %v; want %v", len(writeLog.log), wantCalls)
178 if gotSum != wantSum {
179 t.Errorf("writev call sum = %v; want %v", gotSum, wantSum)
185 func TestWritevError(t *testing.T) {
186 if runtime.GOOS == "windows" {
187 t.Skipf("skipping the test: windows does not have problem sending large chunks of data")
190 ln, err := newLocalListener("tcp")
196 ch := make(chan Conn, 1)
199 c, err := ln.Accept()
206 c1, err := Dial("tcp", ln.Addr().String())
213 t.Fatal("no server side connection")
217 // 1 GB of data should be enough to notice the connection is gone.
218 // Just a few bytes is not enough.
219 // Arrange to reuse the same 1 MB buffer so that we don't allocate much.
220 buf := make([]byte, 1<<20)
221 buffers := make(Buffers, 1<<10)
222 for i := range buffers {
225 if _, err := buffers.WriteTo(c1); err == nil {
226 t.Fatal("Buffers.WriteTo(closed conn) succeeded, want error")