5d6b8141ec
As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code.
379 lines
9.1 KiB
Go
379 lines
9.1 KiB
Go
package asyncreader
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import (
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"bufio"
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"bytes"
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"context"
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"fmt"
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"io"
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"math/rand"
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"strings"
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"sync"
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"testing"
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"testing/iotest"
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"time"
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"github.com/rclone/rclone/lib/israce"
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"github.com/rclone/rclone/lib/readers"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestAsyncReader(t *testing.T) {
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ctx := context.Background()
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buf := io.NopCloser(bytes.NewBufferString("Testbuffer"))
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ar, err := New(ctx, buf, 4)
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require.NoError(t, err)
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var dst = make([]byte, 100)
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n, err := ar.Read(dst)
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assert.Equal(t, io.EOF, err)
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assert.Equal(t, 10, n)
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n, err = ar.Read(dst)
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assert.Equal(t, io.EOF, err)
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assert.Equal(t, 0, n)
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// Test read after error
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n, err = ar.Read(dst)
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assert.Equal(t, io.EOF, err)
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assert.Equal(t, 0, n)
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err = ar.Close()
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require.NoError(t, err)
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// Test double close
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err = ar.Close()
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require.NoError(t, err)
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// Test Close without reading everything
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buf = io.NopCloser(bytes.NewBuffer(make([]byte, 50000)))
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ar, err = New(ctx, buf, 4)
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require.NoError(t, err)
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err = ar.Close()
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require.NoError(t, err)
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}
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func TestAsyncWriteTo(t *testing.T) {
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ctx := context.Background()
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buf := io.NopCloser(bytes.NewBufferString("Testbuffer"))
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ar, err := New(ctx, buf, 4)
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require.NoError(t, err)
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var dst = &bytes.Buffer{}
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n, err := io.Copy(dst, ar)
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require.NoError(t, err)
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assert.Equal(t, int64(10), n)
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// Should still not return any errors
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n, err = io.Copy(dst, ar)
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require.NoError(t, err)
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assert.Equal(t, int64(0), n)
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err = ar.Close()
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require.NoError(t, err)
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}
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func TestAsyncReaderErrors(t *testing.T) {
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ctx := context.Background()
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// test nil reader
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_, err := New(ctx, nil, 4)
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require.Error(t, err)
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// invalid buffer number
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buf := io.NopCloser(bytes.NewBufferString("Testbuffer"))
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_, err = New(ctx, buf, 0)
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require.Error(t, err)
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_, err = New(ctx, buf, -1)
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require.Error(t, err)
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}
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// Complex read tests, leveraged from "bufio".
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type readMaker struct {
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name string
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fn func(io.Reader) io.Reader
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}
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var readMakers = []readMaker{
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{"full", func(r io.Reader) io.Reader { return r }},
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{"byte", iotest.OneByteReader},
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{"half", iotest.HalfReader},
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{"data+err", iotest.DataErrReader},
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{"timeout", iotest.TimeoutReader},
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}
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// Call Read to accumulate the text of a file
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func reads(buf io.Reader, m int) string {
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var b [1000]byte
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nb := 0
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for {
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n, err := buf.Read(b[nb : nb+m])
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nb += n
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if err == io.EOF {
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break
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} else if err != nil && err != iotest.ErrTimeout {
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panic("Data: " + err.Error())
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} else if err != nil {
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break
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}
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}
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return string(b[0:nb])
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}
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type bufReader struct {
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name string
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fn func(io.Reader) string
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}
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var bufreaders = []bufReader{
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{"1", func(b io.Reader) string { return reads(b, 1) }},
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{"2", func(b io.Reader) string { return reads(b, 2) }},
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{"3", func(b io.Reader) string { return reads(b, 3) }},
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{"4", func(b io.Reader) string { return reads(b, 4) }},
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{"5", func(b io.Reader) string { return reads(b, 5) }},
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{"7", func(b io.Reader) string { return reads(b, 7) }},
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}
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const minReadBufferSize = 16
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var bufsizes = []int{
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0, minReadBufferSize, 23, 32, 46, 64, 93, 128, 1024, 4096,
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}
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// Test various input buffer sizes, number of buffers and read sizes.
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func TestAsyncReaderSizes(t *testing.T) {
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ctx := context.Background()
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var texts [31]string
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str := ""
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all := ""
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for i := 0; i < len(texts)-1; i++ {
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texts[i] = str + "\n"
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all += texts[i]
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str += string(rune(i)%26 + 'a')
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}
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texts[len(texts)-1] = all
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for h := 0; h < len(texts); h++ {
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text := texts[h]
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for i := 0; i < len(readMakers); i++ {
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for j := 0; j < len(bufreaders); j++ {
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for k := 0; k < len(bufsizes); k++ {
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for l := 1; l < 10; l++ {
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readmaker := readMakers[i]
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bufreader := bufreaders[j]
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bufsize := bufsizes[k]
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read := readmaker.fn(strings.NewReader(text))
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buf := bufio.NewReaderSize(read, bufsize)
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ar, _ := New(ctx, io.NopCloser(buf), l)
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s := bufreader.fn(ar)
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// "timeout" expects the Reader to recover, AsyncReader does not.
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if s != text && readmaker.name != "timeout" {
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t.Errorf("reader=%s fn=%s bufsize=%d want=%q got=%q",
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readmaker.name, bufreader.name, bufsize, text, s)
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}
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err := ar.Close()
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require.NoError(t, err)
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}
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}
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}
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}
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}
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}
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// Test various input buffer sizes, number of buffers and read sizes.
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func TestAsyncReaderWriteTo(t *testing.T) {
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ctx := context.Background()
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var texts [31]string
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str := ""
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all := ""
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for i := 0; i < len(texts)-1; i++ {
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texts[i] = str + "\n"
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all += texts[i]
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str += string(rune(i)%26 + 'a')
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}
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texts[len(texts)-1] = all
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for h := 0; h < len(texts); h++ {
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text := texts[h]
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for i := 0; i < len(readMakers); i++ {
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for j := 0; j < len(bufreaders); j++ {
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for k := 0; k < len(bufsizes); k++ {
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for l := 1; l < 10; l++ {
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readmaker := readMakers[i]
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bufreader := bufreaders[j]
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bufsize := bufsizes[k]
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read := readmaker.fn(strings.NewReader(text))
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buf := bufio.NewReaderSize(read, bufsize)
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ar, _ := New(ctx, io.NopCloser(buf), l)
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dst := &bytes.Buffer{}
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_, err := ar.WriteTo(dst)
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if err != nil && err != io.EOF && err != iotest.ErrTimeout {
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t.Fatal("Copy:", err)
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}
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s := dst.String()
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// "timeout" expects the Reader to recover, AsyncReader does not.
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if s != text && readmaker.name != "timeout" {
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t.Errorf("reader=%s fn=%s bufsize=%d want=%q got=%q",
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readmaker.name, bufreader.name, bufsize, text, s)
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}
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err = ar.Close()
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require.NoError(t, err)
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}
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}
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}
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}
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}
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}
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// Read an infinite number of zeros
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type zeroReader struct {
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closed bool
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}
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func (z *zeroReader) Read(p []byte) (n int, err error) {
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if z.closed {
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return 0, io.EOF
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}
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for i := range p {
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p[i] = 0
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}
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return len(p), nil
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}
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func (z *zeroReader) Close() error {
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if z.closed {
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panic("double close on zeroReader")
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}
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z.closed = true
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return nil
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}
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// Test closing and abandoning
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func testAsyncReaderClose(t *testing.T, writeto bool) {
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ctx := context.Background()
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zr := &zeroReader{}
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a, err := New(ctx, zr, 16)
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require.NoError(t, err)
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var copyN int64
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var copyErr error
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var wg sync.WaitGroup
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started := make(chan struct{})
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wg.Add(1)
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go func() {
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defer wg.Done()
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close(started)
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if writeto {
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// exercise the WriteTo path
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copyN, copyErr = a.WriteTo(io.Discard)
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} else {
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// exercise the Read path
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buf := make([]byte, 64*1024)
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for {
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var n int
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n, copyErr = a.Read(buf)
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copyN += int64(n)
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if copyErr != nil {
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break
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}
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}
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}
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}()
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// Do some copying
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<-started
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time.Sleep(100 * time.Millisecond)
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// Abandon the copy
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a.Abandon()
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wg.Wait()
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assert.Equal(t, ErrorStreamAbandoned, copyErr)
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// t.Logf("Copied %d bytes, err %v", copyN, copyErr)
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assert.True(t, copyN > 0)
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}
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func TestAsyncReaderCloseRead(t *testing.T) { testAsyncReaderClose(t, false) }
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func TestAsyncReaderCloseWriteTo(t *testing.T) { testAsyncReaderClose(t, true) }
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func TestAsyncReaderSkipBytes(t *testing.T) {
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ctx := context.Background()
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t.Parallel()
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data := make([]byte, 15000)
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buf := make([]byte, len(data))
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r := rand.New(rand.NewSource(42))
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n, err := r.Read(data)
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require.NoError(t, err)
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require.Equal(t, len(data), n)
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initialReads := []int{0, 1, 100, 2048,
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softStartInitial - 1, softStartInitial, softStartInitial + 1,
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8000, len(data)}
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skips := []int{-1000, -101, -100, -99, 0, 1, 2048,
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softStartInitial - 1, softStartInitial, softStartInitial + 1,
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8000, len(data), BufferSize, 2 * BufferSize}
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for buffers := 1; buffers <= 5; buffers++ {
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if israce.Enabled && buffers > 1 {
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t.Skip("FIXME Skipping further tests with race detector until https://github.com/golang/go/issues/27070 is fixed.")
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}
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t.Run(fmt.Sprintf("%d", buffers), func(t *testing.T) {
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for _, initialRead := range initialReads {
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t.Run(fmt.Sprintf("%d", initialRead), func(t *testing.T) {
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for _, skip := range skips {
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t.Run(fmt.Sprintf("%d", skip), func(t *testing.T) {
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ar, err := New(ctx, io.NopCloser(bytes.NewReader(data)), buffers)
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require.NoError(t, err)
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wantSkipFalse := false
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buf = buf[:initialRead]
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n, err := readers.ReadFill(ar, buf)
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if initialRead >= len(data) {
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wantSkipFalse = true
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if initialRead > len(data) {
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assert.Equal(t, err, io.EOF)
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} else {
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assert.True(t, err == nil || err == io.EOF)
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}
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assert.Equal(t, len(data), n)
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assert.Equal(t, data, buf[:len(data)])
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} else {
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assert.NoError(t, err)
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assert.Equal(t, initialRead, n)
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assert.Equal(t, data[:initialRead], buf)
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}
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skipped := ar.SkipBytes(skip)
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buf = buf[:1024]
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n, err = readers.ReadFill(ar, buf)
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offset := initialRead + skip
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if skipped {
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assert.False(t, wantSkipFalse)
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l := len(buf)
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if offset >= len(data) {
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assert.Equal(t, err, io.EOF)
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} else {
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if offset+1024 >= len(data) {
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l = len(data) - offset
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}
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assert.Equal(t, l, n)
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assert.Equal(t, data[offset:offset+l], buf[:l])
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}
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} else {
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if initialRead >= len(data) {
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assert.Equal(t, err, io.EOF)
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} else {
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assert.True(t, err == ErrorStreamAbandoned || err == io.EOF)
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}
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}
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})
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}
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})
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}
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})
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}
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}
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