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package chunked
import (
"bytes"
"errors"
"fmt"
"io"
"os"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
// Mock for ImageSourceSeekable
type mockImageSource struct {
streams chan io.ReadCloser
errors chan error
}
func (m *mockImageSource) GetBlobAt(chunks []ImageSourceChunk) (chan io.ReadCloser, chan error, error) {
return m.streams, m.errors, nil
}
type mockReadCloser struct {
io.Reader
closed bool
}
func (m *mockReadCloser) Close() error {
m.closed = true
return nil
}
func mockReadCloserFromContent(content string) *mockReadCloser {
return &mockReadCloser{Reader: bytes.NewBufferString(content), closed: false}
}
func TestGetBlobAtNormalOperation(t *testing.T) {
errors := make(chan error, 1)
expectedStreams := []string{"stream1", "stream2"}
streamsObjs := []*mockReadCloser{
mockReadCloserFromContent(expectedStreams[0]),
mockReadCloserFromContent(expectedStreams[1]),
}
streams := make(chan io.ReadCloser, len(streamsObjs))
for _, s := range streamsObjs {
streams <- s
}
close(streams)
close(errors)
is := &mockImageSource{streams: streams, errors: errors}
chunks := []ImageSourceChunk{
{Offset: 0, Length: 1},
{Offset: 1, Length: 1},
}
resultChan, err := getBlobAt(is, chunks...)
require.NoError(t, err)
i := 0
for result := range resultChan {
assert.NoError(t, result.err)
buf := new(bytes.Buffer)
_, _ = buf.ReadFrom(result.stream)
result.stream.Close()
assert.Equal(t, expectedStreams[i], buf.String())
i++
}
assert.Len(t, expectedStreams, i)
for _, s := range streamsObjs {
assert.True(t, s.closed)
}
}
func TestGetBlobAtMaxStreams(t *testing.T) {
streams := make(chan io.ReadCloser, 5)
errors := make(chan error)
streamsObjs := []*mockReadCloser{}
for i := 1; i <= 5; i++ {
s := mockReadCloserFromContent(fmt.Sprintf("stream%d", i))
streamsObjs = append(streamsObjs, s)
streams <- s
}
close(streams)
close(errors)
is := &mockImageSource{streams: streams, errors: errors}
chunks := []ImageSourceChunk{
{Offset: 0, Length: 1},
{Offset: 1, Length: 1},
{Offset: 2, Length: 1},
}
resultChan, err := getBlobAt(is, chunks...)
require.NoError(t, err)
count := 0
receivedErr := false
for result := range resultChan {
if result.err != nil {
receivedErr = true
} else {
result.stream.Close()
count++
}
}
assert.True(t, receivedErr)
assert.Equal(t, 3, count)
for _, s := range streamsObjs {
assert.True(t, s.closed)
}
}
func TestGetBlobAtWithErrors(t *testing.T) {
streams := make(chan io.ReadCloser)
errorsC := make(chan error, 2)
errorsC <- errors.New("error1")
errorsC <- errors.New("error2")
close(streams)
close(errorsC)
is := &mockImageSource{streams: streams, errors: errorsC}
chunks := []ImageSourceChunk{
{Offset: 0, Length: 1},
{Offset: 1, Length: 1},
}
resultChan, err := getBlobAt(is, chunks...)
require.NoError(t, err)
expectedErrors := []string{"error1", "error2"}
i := 0
for result := range resultChan {
assert.Nil(t, result.stream)
assert.NotNil(t, result.err)
if result.err != nil {
assert.Equal(t, expectedErrors[i], result.err.Error())
}
i++
}
assert.Equal(t, len(expectedErrors), i)
}
func TestGetBlobAtMixedStreamsAndErrors(t *testing.T) {
streams := make(chan io.ReadCloser, 2)
errorsC := make(chan error, 1)
streams <- mockReadCloserFromContent("stream1")
streams <- mockReadCloserFromContent("stream2")
errorsC <- errors.New("error1")
close(streams)
close(errorsC)
is := &mockImageSource{streams: streams, errors: errorsC}
chunks := []ImageSourceChunk{
{Offset: 0, Length: 1},
{Offset: 1, Length: 1},
}
resultChan, err := getBlobAt(is, chunks...)
require.NoError(t, err)
var receivedStreams int
var receivedErrors int
for result := range resultChan {
if result.err != nil {
receivedErrors++
} else {
receivedStreams++
}
}
assert.Equal(t, 2, receivedStreams)
assert.Equal(t, 1, receivedErrors)
}
func TestTypeToOsMode(t *testing.T) {
tests := []struct {
name string
input string
expected os.FileMode
expectErr bool
}{
{"regular file", TypeReg, 0, false},
{"hard link", TypeLink, 0, false},
{"symlink", TypeSymlink, os.ModeSymlink, false},
{"directory", TypeDir, os.ModeDir, false},
{"character device", TypeChar, os.ModeDevice | os.ModeCharDevice, false},
{"block device", TypeBlock, os.ModeDevice, false},
{"FIFO/pipe", TypeFifo, os.ModeNamedPipe, false},
{"unknown type", "unknown", 0, true},
{"empty string", "", 0, true},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
mode, err := typeToOsMode(tt.input)
if tt.expectErr {
assert.Error(t, err)
} else {
require.NoError(t, err)
assert.Equal(t, tt.expected, mode)
}
})
}
}
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