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package main
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path"
"reflect"
"testing"
)
func chunkCompare(t *testing.T, dataDir string, repo *Repo, testFiles []string, chunkCount int) {
reader, writer := io.Pipe()
chunks := make(chan []byte)
files := listFiles(dataDir)
go concatFiles(files, writer)
go repo.chunkStream(reader, chunks)
offset := 0
buff := make([]byte, repo.chunkSize*chunkCount)
for _, f := range testFiles {
content, err := os.ReadFile(path.Join(dataDir, f))
if err != nil {
t.Error("Error reading test data file")
}
for i := range content {
buff[offset+i] = content[i]
}
offset += len(content)
}
i := 0
for c := range chunks {
start := i * repo.chunkSize
end := (i + 1) * repo.chunkSize
if end > offset {
end = offset
}
content := buff[start:end]
if bytes.Compare(c, content) != 0 {
t.Errorf("Chunk %d does not match file content", i)
// for i, b := range c {
// fmt.Printf("E: %d, A: %d\n", b, content[i])
// }
t.Log("Expected: ", c[:10], "...", c[end%repo.chunkSize-10:])
t.Log("Actual:", content)
}
i++
}
if i != chunkCount {
t.Errorf("Incorrect number of chunks: %d, should be: %d", i, chunkCount)
}
}
func (r *Repo) chunkStream(stream io.Reader, chunks chan<- []byte) {
var buff []byte
var prev, read = r.chunkSize, 0
var err error
for err != io.EOF {
if prev == r.chunkSize {
buff = make([]byte, r.chunkSize)
prev, err = stream.Read(buff)
} else {
read, err = stream.Read(buff[prev:])
prev += read
}
if err != nil && err != io.EOF {
log.Println(err)
}
if prev == r.chunkSize {
chunks <- buff
}
}
if prev != r.chunkSize {
chunks <- buff[:prev]
}
close(chunks)
}
func storeChunks(dest string, chunks <-chan []byte) {
i := 0
for c := range chunks {
path := path.Join(dest, fmt.Sprintf(chunkIdFmt, i))
err := os.WriteFile(path, c, 0664)
if err != nil {
log.Println(err)
}
i++
}
}
func TestReadFiles1(t *testing.T) {
repo := NewRepo("")
chunkCount := 590/repo.chunkSize + 1
dataDir := path.Join("testdata", "logs", "1")
files := []string{"logTest.log"}
chunkCompare(t, dataDir, repo, files, chunkCount)
}
func TestReadFiles2(t *testing.T) {
repo := NewRepo("")
chunkCount := 22899/repo.chunkSize + 1
dataDir := path.Join("testdata", "logs", "2")
files := []string{"csvParserTest.log", "slipdb.log"}
chunkCompare(t, dataDir, repo, files, chunkCount)
}
func TestReadFiles3(t *testing.T) {
repo := NewRepo("")
chunkCount := 119398/repo.chunkSize + 1
dataDir := path.Join("testdata", "logs")
files := []string{
path.Join("1", "logTest.log"),
path.Join("2", "csvParserTest.log"),
path.Join("2", "slipdb.log"),
path.Join("3", "indexingTreeTest.log"),
}
chunkCompare(t, dataDir, repo, files, chunkCount)
}
func TestLoadChunks(t *testing.T) {
resultDir := t.TempDir()
dataDir := path.Join("testdata", "logs")
repo := NewRepo(resultDir)
resultVersion := path.Join(resultDir, "00000")
resultChunks := path.Join(resultVersion, chunksName)
os.MkdirAll(resultChunks, 0775)
reader1, writer1 := io.Pipe()
reader2, writer2 := io.Pipe()
chunks1 := make(chan []byte, 16)
chunks2 := make(chan []byte, 16)
chunks3 := make(chan IdentifiedChunk, 16)
files := listFiles(dataDir)
go concatFiles(files, writer1)
go concatFiles(files, writer2)
go repo.chunkStream(reader1, chunks1)
go repo.chunkStream(reader2, chunks2)
storeChunks(resultChunks, chunks1)
versions := []string{resultVersion}
go repo.loadChunks(versions, chunks3)
i := 0
for c2 := range chunks2 {
c3 := <-chunks3
buff, err := io.ReadAll(c3.Reader())
if err != nil {
t.Errorf("Error reading from chunk %d: %s\n", c3, err)
}
if bytes.Compare(c2, buff) != 0 {
t.Errorf("Chunk %d does not match file content", i)
t.Log("Expected: ", c2[:10], "...")
t.Log("Actual:", buff)
}
i++
}
}
func TestStoreLoadFiles(t *testing.T) {
resultDir := t.TempDir()
dataDir := path.Join("testdata", "logs")
resultFiles := path.Join(resultDir, filesName)
files1 := listFiles(dataDir)
storeFileList(resultFiles, files1)
files2 := loadFileList(resultFiles)
assertLen(t, 4, files1, "Files:")
for i, f := range files1 {
if f != files2[i] {
t.Errorf("Loaded file data %d does not match stored one", i)
t.Log("Expected: ", f)
t.Log("Actual: ", files2[i])
}
}
}
func prepareChunks(dataDir string, repo *Repo, streamFunc func([]File, io.WriteCloser)) {
resultVersion := path.Join(repo.path, "00000")
resultChunks := path.Join(resultVersion, chunksName)
os.MkdirAll(resultChunks, 0775)
reader := getDataStream(dataDir, streamFunc)
chunks := make(chan []byte, 16)
go repo.chunkStream(reader, chunks)
storeChunks(resultChunks, chunks)
}
func getDataStream(dataDir string, streamFunc func([]File, io.WriteCloser)) io.Reader {
reader, writer := io.Pipe()
files := listFiles(dataDir)
go streamFunc(files, writer)
return reader
}
func TestBsdiff(t *testing.T) {
resultDir := t.TempDir()
repo := NewRepo(resultDir)
dataDir := path.Join("testdata", "logs")
addedFile1 := path.Join(dataDir, "2", "slogTest.log")
addedFile2 := path.Join(dataDir, "3", "slogTest.log")
// Store initial chunks
prepareChunks(dataDir, repo, concatFiles)
// Modify data
ioutil.WriteFile(addedFile1, []byte("hello"), 0664)
defer os.Remove(addedFile1)
ioutil.WriteFile(addedFile2, make([]byte, 4000), 0664)
defer os.Remove(addedFile2)
// Load previously stored chunks
oldChunks := make(chan IdentifiedChunk, 16)
versions := repo.loadVersions()
newVersion := len(versions)
go repo.loadChunks(versions, oldChunks)
repo.hashChunks(oldChunks)
// Read new data
reader := getDataStream(dataDir, concatFiles)
recipe := repo.matchStream(reader, newVersion)
newChunks := extractDeltaChunks(recipe)
assertLen(t, 2, newChunks, "New delta chunks:")
for _, c := range newChunks {
log.Println("Patch size:", len(c.Patch))
if len(c.Patch) >= repo.chunkSize/10 {
t.Errorf("Bsdiff of chunk is too large: %d", len(c.Patch))
}
}
}
func TestCommit(t *testing.T) {
dest := t.TempDir()
source := path.Join("testdata", "logs")
expected := path.Join("testdata", "repo_8k")
repo := NewRepo(dest)
repo.Commit(source)
assertSameTree(t, assertCompatibleRepoFile, expected, dest, "Commit")
}
func TestRestore(t *testing.T) {
dest := t.TempDir()
source := path.Join("testdata", "repo_8k")
expected := path.Join("testdata", "logs")
repo := NewRepo(source)
repo.Restore(dest)
assertSameTree(t, assertSameFile, expected, dest, "Restore")
}
func assertSameTree(t *testing.T, apply func(t *testing.T, expected string, actual string, prefix string), expected string, actual string, prefix string) {
actualFiles := listFiles(actual)
expectedFiles := listFiles(expected)
efCount := len(expectedFiles)
if efCount <= 0 {
t.Fatalf("No expected files: %d", efCount)
}
afCount := len(actualFiles)
if efCount != afCount {
t.Fatalf("Incorrect number of files: %d, should be %d", afCount, efCount)
}
for i, ef := range expectedFiles {
af := actualFiles[i]
efRelPath := ef.Path[len(expected):]
afRelPath := af.Path[len(actual):]
if efRelPath != afRelPath {
t.Fatalf("File path '%s' does not match '%s'", afRelPath, efRelPath)
}
apply(t, ef.Path, af.Path, prefix)
}
}
func assertCompatibleRepoFile(t *testing.T, expected string, actual string, prefix string) {
if path.Base(expected) == filesName {
eFiles := loadFileList(expected)
aFiles := loadFileList(actual)
assertLen(t, len(eFiles), aFiles, prefix)
for i := 0; i < len(eFiles); i++ {
if eFiles[i] != aFiles[i] {
t.Fatal(prefix, "file entry do not match:", aFiles[i], ", expected:", eFiles[i])
}
}
} else if path.Base(expected) == recipeName {
// TODO: check recipies equality
} else {
assertSameFile(t, expected, actual, prefix)
}
}
func assertSameFile(t *testing.T, expected string, actual string, prefix string) {
efContent, err := os.ReadFile(expected)
if err != nil {
t.Fatalf("%s Error reading from expected file '%s': %s", prefix, expected, err)
}
afContent, err := os.ReadFile(actual)
if err != nil {
t.Fatalf("%s Error reading from expected file '%s': %s", prefix, actual, err)
}
assertSameSlice(t, efContent, afContent, prefix+" files")
}
func assertLen(t *testing.T, expected int, actual interface{}, prefix string) {
s := reflect.ValueOf(actual)
if s.Len() != expected {
t.Fatal(prefix, "incorrect length, expected:", expected, ", actual:", s.Len())
}
}
func assertSameSlice(t *testing.T, expected []byte, actual []byte, prefix string) {
assertLen(t, len(expected), actual, prefix)
for i := 0; i < len(expected); i++ {
if expected[i] != actual[i] {
t.Fatal(prefix, "incorrect value", i, ", expected:", expected[i], ", actual:", actual[i])
}
}
}
func assertChunkContent(t *testing.T, expected []byte, c Chunk, prefix string) {
buf, err := io.ReadAll(c.Reader())
if err != nil {
t.Fatal(err)
}
assertSameSlice(t, expected, buf, prefix+" Chunk content")
}
|
