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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package http2
import (
"bytes"
"fmt"
"reflect"
"testing"
)
func fmtDataChunk(chunk []byte) string {
out := ""
var last byte
var count int
for _, c := range chunk {
if c != last {
if count > 0 {
out += fmt.Sprintf(" x %d ", count)
count = 0
}
out += string([]byte{c})
last = c
}
count++
}
if count > 0 {
out += fmt.Sprintf(" x %d", count)
}
return out
}
func fmtDataChunks(chunks [][]byte) string {
var out string
for _, chunk := range chunks {
out += fmt.Sprintf("{%q}", fmtDataChunk(chunk))
}
return out
}
func testDataBuffer(t *testing.T, wantBytes []byte, setup func(t *testing.T) *dataBuffer) {
// Run setup, then read the remaining bytes from the dataBuffer and check
// that they match wantBytes. We use different read sizes to check corner
// cases in Read.
for _, readSize := range []int{1, 2, 1 * 1024, 32 * 1024} {
t.Run(fmt.Sprintf("ReadSize=%d", readSize), func(t *testing.T) {
b := setup(t)
buf := make([]byte, readSize)
var gotRead bytes.Buffer
for {
n, err := b.Read(buf)
gotRead.Write(buf[:n])
if err == errReadEmpty {
break
}
if err != nil {
t.Fatalf("error after %v bytes: %v", gotRead.Len(), err)
}
}
if got, want := gotRead.Bytes(), wantBytes; !bytes.Equal(got, want) {
t.Errorf("FinalRead=%q, want %q", fmtDataChunk(got), fmtDataChunk(want))
}
})
}
}
func TestDataBufferAllocation(t *testing.T) {
writes := [][]byte{
bytes.Repeat([]byte("a"), 1*1024-1),
[]byte("a"),
bytes.Repeat([]byte("b"), 4*1024-1),
[]byte("b"),
bytes.Repeat([]byte("c"), 8*1024-1),
[]byte("c"),
bytes.Repeat([]byte("d"), 16*1024-1),
[]byte("d"),
bytes.Repeat([]byte("e"), 32*1024),
}
var wantRead bytes.Buffer
for _, p := range writes {
wantRead.Write(p)
}
testDataBuffer(t, wantRead.Bytes(), func(t *testing.T) *dataBuffer {
b := &dataBuffer{}
for _, p := range writes {
if n, err := b.Write(p); n != len(p) || err != nil {
t.Fatalf("Write(%q x %d)=%v,%v want %v,nil", p[:1], len(p), n, err, len(p))
}
}
want := [][]byte{
bytes.Repeat([]byte("a"), 1*1024),
bytes.Repeat([]byte("b"), 4*1024),
bytes.Repeat([]byte("c"), 8*1024),
bytes.Repeat([]byte("d"), 16*1024),
bytes.Repeat([]byte("e"), 16*1024),
bytes.Repeat([]byte("e"), 16*1024),
}
if !reflect.DeepEqual(b.chunks, want) {
t.Errorf("dataBuffer.chunks\ngot: %s\nwant: %s", fmtDataChunks(b.chunks), fmtDataChunks(want))
}
return b
})
}
func TestDataBufferAllocationWithExpected(t *testing.T) {
writes := [][]byte{
bytes.Repeat([]byte("a"), 1*1024), // allocates 16KB
bytes.Repeat([]byte("b"), 14*1024),
bytes.Repeat([]byte("c"), 15*1024), // allocates 16KB more
bytes.Repeat([]byte("d"), 2*1024),
bytes.Repeat([]byte("e"), 1*1024), // overflows 32KB expectation, allocates just 1KB
}
var wantRead bytes.Buffer
for _, p := range writes {
wantRead.Write(p)
}
testDataBuffer(t, wantRead.Bytes(), func(t *testing.T) *dataBuffer {
b := &dataBuffer{expected: 32 * 1024}
for _, p := range writes {
if n, err := b.Write(p); n != len(p) || err != nil {
t.Fatalf("Write(%q x %d)=%v,%v want %v,nil", p[:1], len(p), n, err, len(p))
}
}
want := [][]byte{
append(bytes.Repeat([]byte("a"), 1*1024), append(bytes.Repeat([]byte("b"), 14*1024), bytes.Repeat([]byte("c"), 1*1024)...)...),
append(bytes.Repeat([]byte("c"), 14*1024), bytes.Repeat([]byte("d"), 2*1024)...),
bytes.Repeat([]byte("e"), 1*1024),
}
if !reflect.DeepEqual(b.chunks, want) {
t.Errorf("dataBuffer.chunks\ngot: %s\nwant: %s", fmtDataChunks(b.chunks), fmtDataChunks(want))
}
return b
})
}
func TestDataBufferWriteAfterPartialRead(t *testing.T) {
testDataBuffer(t, []byte("cdxyz"), func(t *testing.T) *dataBuffer {
b := &dataBuffer{}
if n, err := b.Write([]byte("abcd")); n != 4 || err != nil {
t.Fatalf("Write(\"abcd\")=%v,%v want 4,nil", n, err)
}
p := make([]byte, 2)
if n, err := b.Read(p); n != 2 || err != nil || !bytes.Equal(p, []byte("ab")) {
t.Fatalf("Read()=%q,%v,%v want \"ab\",2,nil", p, n, err)
}
if n, err := b.Write([]byte("xyz")); n != 3 || err != nil {
t.Fatalf("Write(\"xyz\")=%v,%v want 3,nil", n, err)
}
return b
})
}