mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-15 16:30:55 +01:00
241 lines
6.0 KiB
Go
241 lines
6.0 KiB
Go
package common
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"reflect"
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"testing"
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)
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func TestReadLinesBlockFailure(t *testing.T) {
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f := func(s string) {
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t.Helper()
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r := bytes.NewBufferString(s)
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if _, _, err := ReadLinesBlock(r, nil, nil); err == nil {
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t.Fatalf("expecting non-nil error")
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}
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sbr := &singleByteReader{
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b: []byte(s),
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}
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if _, _, err := ReadLinesBlock(sbr, nil, nil); err == nil {
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t.Fatalf("expecting non-nil error")
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}
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fr := &failureReader{}
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if _, _, err := ReadLinesBlock(fr, nil, nil); err == nil {
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t.Fatalf("expecting non-nil error")
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}
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un := &unexpectedEOF{}
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if _, _, err := ReadLinesBlock(un, nil, nil); err != nil {
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if !errors.Is(err, io.EOF) {
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t.Fatalf("get unexpected error, expecting io.EOF")
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}
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}
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ef := eofErr{}
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if _, _, err := ReadLinesBlock(ef, nil, nil); err != nil {
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if !errors.Is(err, io.EOF) {
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t.Fatalf("get unexpected error, expecting io.EOF")
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}
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}
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}
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// empty string
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f("")
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// too long string
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b := make([]byte, maxLineSize+1)
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f(string(b))
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}
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type failureReader struct{}
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func (fr *failureReader) Read(_ []byte) (int, error) {
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return 0, fmt.Errorf("some error")
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}
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type unexpectedEOF struct{}
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func (un unexpectedEOF) Read(_ []byte) (int, error) {
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return 0, io.ErrUnexpectedEOF
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}
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type eofErr struct{}
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func (eo eofErr) Read(_ []byte) (int, error) {
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return 0, io.EOF
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}
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func TestReadLinesBlockMultiLinesSingleByteReader(t *testing.T) {
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f := func(s string, linesExpected []string) {
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t.Helper()
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r := &singleByteReader{
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b: []byte(s),
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}
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var err error
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var dstBuf, tailBuf []byte
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var lines []string
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for {
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dstBuf, tailBuf, err = ReadLinesBlock(r, dstBuf, tailBuf)
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if err != nil {
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if err == io.EOF {
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break
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}
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t.Fatalf("unexpected error in ReadLinesBlock(%q): %s", s, err)
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}
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lines = append(lines, string(dstBuf))
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}
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if !reflect.DeepEqual(lines, linesExpected) {
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t.Fatalf("unexpected lines after reading %q: got %q; want %q", s, lines, linesExpected)
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}
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}
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f("", nil)
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f("foo", []string{"foo"})
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f("foo\n", []string{"foo"})
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f("foo\nbar", []string{"foo", "bar"})
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f("\nfoo\nbar", []string{"", "foo", "bar"})
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f("\nfoo\nbar\n", []string{"", "foo", "bar"})
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f("\nfoo\nbar\n\n", []string{"", "foo", "bar", ""})
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}
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func TestReadLinesBlockMultiLinesBytesBuffer(t *testing.T) {
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f := func(s string, linesExpected []string) {
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t.Helper()
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r := bytes.NewBufferString(s)
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var err error
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var dstBuf, tailBuf []byte
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var lines []string
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for {
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dstBuf, tailBuf, err = ReadLinesBlock(r, dstBuf, tailBuf)
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if err != nil {
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if err == io.EOF {
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break
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}
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t.Fatalf("unexpected error in ReadLinesBlock(%q): %s", s, err)
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}
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lines = append(lines, string(dstBuf))
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}
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if !reflect.DeepEqual(lines, linesExpected) {
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t.Fatalf("unexpected lines after reading %q: got %q; want %q", s, lines, linesExpected)
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}
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}
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f("", nil)
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f("foo", []string{"foo"})
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f("foo\n", []string{"foo"})
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f("foo\nbar", []string{"foo", "bar"})
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f("\nfoo\nbar", []string{"\nfoo", "bar"})
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f("\nfoo\nbar\n", []string{"\nfoo\nbar"})
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f("\nfoo\nbar\n\n", []string{"\nfoo\nbar\n"})
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}
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func TestReadLinesBlockSuccessSingleByteReader(t *testing.T) {
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f := func(s, dstBufExpected, tailBufExpected string) {
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t.Helper()
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r := &singleByteReader{
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b: []byte(s),
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}
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dstBuf, tailBuf, err := ReadLinesBlock(r, nil, nil)
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if err != nil {
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t.Fatalf("unexpected error: %s", err)
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}
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if string(dstBuf) != dstBufExpected {
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t.Fatalf("unexpected dstBuf; got %q; want %q; tailBuf=%q", dstBuf, dstBufExpected, tailBuf)
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}
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if string(tailBuf) != tailBufExpected {
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t.Fatalf("unexpected tailBuf; got %q; want %q; dstBuf=%q", tailBuf, tailBufExpected, dstBuf)
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}
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// Verify the same with non-empty dstBuf and tailBuf
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r = &singleByteReader{
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b: []byte(s),
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}
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dstBuf, tailBuf, err = ReadLinesBlock(r, dstBuf, tailBuf[:0])
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if err != nil {
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t.Fatalf("non-empty bufs: unexpected error: %s", err)
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}
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if string(dstBuf) != dstBufExpected {
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t.Fatalf("non-empty bufs: unexpected dstBuf; got %q; want %q; tailBuf=%q", dstBuf, dstBufExpected, tailBuf)
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}
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if string(tailBuf) != tailBufExpected {
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t.Fatalf("non-empty bufs: unexpected tailBuf; got %q; want %q; dstBuf=%q", tailBuf, tailBufExpected, dstBuf)
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}
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}
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f("\n", "", "")
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f("foo\n", "foo", "")
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f("\nfoo", "", "")
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f("foo\nbar", "foo", "")
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f("foo\nbar\nbaz", "foo", "")
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f("foo", "foo", "")
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// The maximum line size
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b := make([]byte, maxLineSize+10)
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b[maxLineSize] = '\n'
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f(string(b), string(b[:maxLineSize]), "")
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}
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func TestReadLinesBlockSuccessBytesBuffer(t *testing.T) {
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f := func(s, dstBufExpected, tailBufExpected string) {
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t.Helper()
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r := bytes.NewBufferString(s)
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dstBuf, tailBuf, err := ReadLinesBlock(r, nil, nil)
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if err != nil {
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t.Fatalf("unexpected error: %s", err)
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}
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if string(dstBuf) != dstBufExpected {
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t.Fatalf("unexpected dstBuf; got %q; want %q; tailBuf=%q", dstBuf, dstBufExpected, tailBuf)
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}
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if string(tailBuf) != tailBufExpected {
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t.Fatalf("unexpected tailBuf; got %q; want %q; dstBuf=%q", tailBuf, tailBufExpected, dstBuf)
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}
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// Verify the same with non-empty dstBuf and tailBuf
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r = bytes.NewBufferString(s)
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dstBuf, tailBuf, err = ReadLinesBlock(r, dstBuf, tailBuf[:0])
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if err != nil {
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t.Fatalf("non-empty bufs: unexpected error: %s", err)
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}
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if string(dstBuf) != dstBufExpected {
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t.Fatalf("non-empty bufs: unexpected dstBuf; got %q; want %q; tailBuf=%q", dstBuf, dstBufExpected, tailBuf)
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}
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if string(tailBuf) != tailBufExpected {
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t.Fatalf("non-empty bufs: unexpected tailBuf; got %q; want %q; dstBuf=%q", tailBuf, tailBufExpected, dstBuf)
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}
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}
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f("\n", "", "")
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f("foo\n", "foo", "")
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f("\nfoo", "", "foo")
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f("foo\nbar", "foo", "bar")
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f("foo\nbar\nbaz", "foo\nbar", "baz")
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// The maximum line size
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b := make([]byte, maxLineSize+10)
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b[maxLineSize] = '\n'
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f(string(b), string(b[:maxLineSize]), string(b[maxLineSize+1:]))
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}
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type singleByteReader struct {
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b []byte
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}
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func (sbr *singleByteReader) Read(p []byte) (int, error) {
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if len(sbr.b) == 0 {
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return 0, io.EOF
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}
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n := copy(p, sbr.b[:1])
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sbr.b = sbr.b[n:]
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if len(sbr.b) == 0 {
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return n, io.EOF
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}
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return n, nil
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}
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