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package pools // import "github.com/docker/docker/pkg/pools"
import (
"bufio"
"bytes"
"io"
"strings"
"testing"
"gotest.tools/v3/assert"
is "gotest.tools/v3/assert/cmp"
)
func TestBufioReaderPoolGetWithNoReaderShouldCreateOne(t *testing.T) {
reader := BufioReader32KPool.Get(nil)
if reader == nil {
t.Fatalf("BufioReaderPool should have create a bufio.Reader but did not.")
}
}
func TestBufioReaderPoolPutAndGet(t *testing.T) {
sr := bufio.NewReader(strings.NewReader("foobar"))
reader := BufioReader32KPool.Get(sr)
if reader == nil {
t.Fatalf("BufioReaderPool should not return a nil reader.")
}
// verify the first 3 byte
buf1 := make([]byte, 3)
_, err := reader.Read(buf1)
if err != nil {
t.Fatal(err)
}
if actual := string(buf1); actual != "foo" {
t.Fatalf("The first letter should have been 'foo' but was %v", actual)
}
BufioReader32KPool.Put(reader)
// Try to read the next 3 bytes
_, err = sr.Read(make([]byte, 3))
if err == nil || err != io.EOF {
t.Fatalf("The buffer should have been empty, issue an EOF error.")
}
}
type simpleReaderCloser struct {
io.Reader
closed bool
}
func (r *simpleReaderCloser) Close() error {
r.closed = true
return nil
}
func TestNewReadCloserWrapperWithAReadCloser(t *testing.T) {
br := bufio.NewReader(strings.NewReader(""))
sr := &simpleReaderCloser{
Reader: strings.NewReader("foobar"),
closed: false,
}
reader := BufioReader32KPool.NewReadCloserWrapper(br, sr)
if reader == nil {
t.Fatalf("NewReadCloserWrapper should not return a nil reader.")
}
// Verify the content of reader
buf := make([]byte, 3)
_, err := reader.Read(buf)
if err != nil {
t.Fatal(err)
}
if actual := string(buf); actual != "foo" {
t.Fatalf("The first 3 letter should have been 'foo' but were %v", actual)
}
reader.Close()
// Read 3 more bytes "bar"
_, err = reader.Read(buf)
if err != nil {
t.Fatal(err)
}
if actual := string(buf); actual != "bar" {
t.Fatalf("The first 3 letter should have been 'bar' but were %v", actual)
}
if !sr.closed {
t.Fatalf("The ReaderCloser should have been closed, it is not.")
}
}
func TestBufioWriterPoolGetWithNoReaderShouldCreateOne(t *testing.T) {
writer := BufioWriter32KPool.Get(nil)
if writer == nil {
t.Fatalf("BufioWriterPool should have create a bufio.Writer but did not.")
}
}
func TestBufioWriterPoolPutAndGet(t *testing.T) {
buf := new(bytes.Buffer)
bw := bufio.NewWriter(buf)
writer := BufioWriter32KPool.Get(bw)
assert.Assert(t, writer != nil)
written, err := writer.Write([]byte("foobar"))
assert.NilError(t, err)
assert.Check(t, is.Equal(6, written))
// Make sure we Flush all the way ?
writer.Flush()
bw.Flush()
assert.Check(t, is.Len(buf.Bytes(), 6))
// Reset the buffer
buf.Reset()
BufioWriter32KPool.Put(writer)
// Try to write something
if _, err = writer.Write([]byte("barfoo")); err != nil {
t.Fatal(err)
}
// If we now try to flush it, it should panic (the writer is nil)
// recover it
defer func() {
if r := recover(); r == nil {
t.Fatal("Trying to flush the writter should have 'paniced', did not.")
}
}()
writer.Flush()
}
type simpleWriterCloser struct {
io.Writer
closed bool
}
func (r *simpleWriterCloser) Close() error {
r.closed = true
return nil
}
func TestNewWriteCloserWrapperWithAWriteCloser(t *testing.T) {
buf := new(bytes.Buffer)
bw := bufio.NewWriter(buf)
sw := &simpleWriterCloser{
Writer: new(bytes.Buffer),
closed: false,
}
bw.Flush()
writer := BufioWriter32KPool.NewWriteCloserWrapper(bw, sw)
if writer == nil {
t.Fatalf("BufioReaderPool should not return a nil writer.")
}
written, err := writer.Write([]byte("foobar"))
if err != nil {
t.Fatal(err)
}
if written != 6 {
t.Fatalf("Should have written 6 bytes, but wrote %v bytes", written)
}
writer.Close()
if !sw.closed {
t.Fatalf("The ReaderCloser should have been closed, it is not.")
}
}
func TestBufferPoolPutAndGet(t *testing.T) {
buf := buffer32KPool.Get()
buffer32KPool.Put(buf)
}
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