381 lines
9.1 KiB
Go
381 lines
9.1 KiB
Go
package storage
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import (
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"path"
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"os"
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"time"
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"github.com/satori/go.uuid"
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"fmt"
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"errors"
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"io/ioutil"
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"bytes"
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"path/filepath"
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"encoding/json"
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"strings"
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"strconv"
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)
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const EMPTY_STREAM = uint32(0)
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var CRLF = []byte("\r\n")
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type DailyDiskStorage struct {
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storagePath string
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indexesPath string
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typesIndexesPath string
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globalIndexFilename string
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}
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func NewDailyDiskStorage(storagePath string) Storage {
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fmt.Println("Using DailyDiskStorage path:", storagePath)
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indexesPath := path.Join(storagePath, "indexes")
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globalIndexPath := path.Join(indexesPath, "global")
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typesIndexesPath := path.Join(indexesPath, "types")
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if err := os.MkdirAll(typesIndexesPath, 0777); err != nil {
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panic(err)
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}
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return &DailyDiskStorage{storagePath, indexesPath, typesIndexesPath, globalIndexPath};
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}
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func (me DailyDiskStorage) getStreamIndexFilename(streamId uuid.UUID) string {
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return path.Join(me.indexesPath, streamId.String())
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}
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func (me DailyDiskStorage) getEventFilename(creationTime time.Time, typeId string) string {
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yearMonth := fmt.Sprintf("%04d%02d", creationTime.Year(), creationTime.Month())
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day := fmt.Sprintf("%02d", creationTime.Day())
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eventFilename := fmt.Sprintf("%02d%02d%02d%09d_%s", creationTime.Hour(), creationTime.Minute(), creationTime.Second(), creationTime.Nanosecond(), typeId)
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return path.Join(me.storagePath, yearMonth, day, eventFilename)
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}
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type IndexEntry struct {
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streamId uuid.UUID
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creationTime time.Time
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typeId string
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}
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func appendIndex(filename string, entry *IndexEntry) error {
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indexFile, err := os.OpenFile(filename, os.O_APPEND | os.O_WRONLY | os.O_CREATE, 0644)
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if err != nil {
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return err
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}
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defer indexFile.Close()
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written, err := indexFile.Write(entry.streamId.Bytes())
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if err != nil {
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return err
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}
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if written != 16 {
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return errors.New(fmt.Sprintf("Write error. Expected to write %v bytes, wrote only %v.", 16, written))
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}
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creationTimeBytes, err := entry.creationTime.MarshalBinary()
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if err != nil {
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return err
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}
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writeSizeAndBytes(indexFile, creationTimeBytes)
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writeSizeAndBytes(indexFile, []byte(entry.typeId))
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return nil
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}
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func (me DailyDiskStorage) appendTypeIndex(entry *IndexEntry) error {
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filename := path.Join(me.typesIndexesPath, entry.typeId)
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indexFile, err := os.OpenFile(filename, os.O_APPEND | os.O_WRONLY | os.O_CREATE, 0644 )
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if err != nil {
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return err
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}
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defer indexFile.Close()
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value := me.getEventFilename(entry.creationTime, entry.typeId)
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start := len(me.storagePath) + 1
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_, err = indexFile.WriteString(value[start:] + "\r\n")
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return err
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}
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func readIndexNextEntry(f *os.File) (*IndexEntry, error) {
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index := IndexEntry{}
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uuidBytes := make([]byte, 16)
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read, err := f.Read(uuidBytes)
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if err != nil {
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return nil, err
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}
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if read != 16 {
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return nil, errors.New(fmt.Sprintf("Integrity error. Expected to read %v bytes, got only %v bytes.", 16, read))
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}
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index.streamId = uuid.FromBytesOrNil(uuidBytes)
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creationTimeBytes, err := readSizedBytes(f)
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if err != nil {
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return nil, err
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}
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if err = index.creationTime.UnmarshalBinary(creationTimeBytes); err != nil {
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return nil, err
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}
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typeIdBytes, err := readSizedBytes(f)
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index.typeId = string(typeIdBytes)
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return &index, nil;
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}
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func writeEvent(filename string, data []byte, metadata []byte) error {
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eventFile, err := os.OpenFile(filename, os.O_APPEND | os.O_WRONLY | os.O_CREATE, 0644)
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if err != nil {
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return err
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}
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defer eventFile.Close()
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eventFile.Write(data)
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eventFile.Write(CRLF)
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eventFile.Write(metadata)
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return nil
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}
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func readEvent(filename string) (data []byte, metadata []byte, err error) {
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content, err := ioutil.ReadFile(filename)
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if err != nil {
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return
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}
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sep := bytes.Index(content, CRLF)
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if sep == -1 {
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data = content
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metadata = make([]byte, 0)
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return
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}
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data = content[:sep]
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metadata = content[sep+2:]
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return
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}
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func (me DailyDiskStorage) Write(event *StoredEvent) error {
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eventFilename := me.getEventFilename(event.CreationTime, event.TypeId)
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os.MkdirAll(path.Dir(eventFilename), 0777)
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err := writeEvent(eventFilename, event.Data, event.Metadata)
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if err != nil {
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return err
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}
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index := &IndexEntry{event.StreamId, event.CreationTime, event.TypeId}
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err = appendIndex(me.globalIndexFilename, index)
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if err != nil {
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return err
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}
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err = appendIndex(me.getStreamIndexFilename(event.StreamId), index)
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if err != nil {
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return err
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}
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return me.appendTypeIndex(index)
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}
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func (me DailyDiskStorage) StreamVersion(streamId uuid.UUID) (uint32, error) {
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indexFile, err := os.OpenFile(me.getStreamIndexFilename(streamId), os.O_RDONLY, 0)
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if err != nil {
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return EMPTY_STREAM, errors.New("NOT_FOUND: " + err.Error())
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}
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defer indexFile.Close()
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ver := EMPTY_STREAM
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for {
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_, err := readIndexNextEntry(indexFile)
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if err != nil && err.Error() == "EOF" {
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break
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}
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if err != nil {
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return EMPTY_STREAM, err
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}
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ver++
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}
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return ver, nil
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}
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func (me DailyDiskStorage) ReadStream(streamId uuid.UUID) ([]*StoredEvent, error) {
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indexFile, err := os.OpenFile(me.getStreamIndexFilename(streamId), os.O_RDONLY, 0)
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if err != nil {
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return nil, errors.New("NOT_FOUND: " + err.Error())
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}
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defer indexFile.Close()
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events := make([]*StoredEvent, 0)
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for {
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indexEntry, err := readIndexNextEntry(indexFile)
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if err != nil && err.Error() == "EOF" {
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break
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}
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if err != nil {
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return nil, err
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}
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data, metadata, err := readEvent(me.getEventFilename(indexEntry.creationTime, indexEntry.typeId))
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if err != nil {
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return nil, err
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}
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event := &StoredEvent{streamId, indexEntry.creationTime, indexEntry.typeId, data, "Metadata", metadata}
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events = append(events, event)
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}
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return events, nil
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}
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func (me DailyDiskStorage) ReadAll() ([]*StoredEvent, error) {
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indexFile, err := os.OpenFile(me.globalIndexFilename, os.O_RDONLY, 0)
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if err != nil {
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return nil, err
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}
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defer indexFile.Close()
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events := make([]*StoredEvent, 0)
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for {
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indexEntry, err := readIndexNextEntry(indexFile)
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if err != nil && err.Error() == "EOF" {
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break
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}
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if err != nil {
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return nil, err
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}
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data, metadata, err := readEvent(me.getEventFilename(indexEntry.creationTime, indexEntry.typeId))
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if err != nil {
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return nil, err
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}
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event := &StoredEvent{indexEntry.streamId, indexEntry.creationTime, indexEntry.typeId, data, "Metadata", metadata}
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events = append(events, event)
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}
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return events, nil
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}
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func (me DailyDiskStorage) RebuildTypeIndexes() {
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fmt.Print("Rebuilding type indexes... ")
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err := os.RemoveAll(me.typesIndexesPath)
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if err != nil {
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panic(err)
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}
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err = os.MkdirAll(me.typesIndexesPath, 0777)
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if err != nil {
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panic(err)
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}
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globalIndexFile, err := os.OpenFile(me.globalIndexFilename, os.O_RDONLY, 0644)
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if err != nil {
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panic(err)
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}
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for {
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indexEntry, err := readIndexNextEntry(globalIndexFile)
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if err != nil && err.Error() == "EOF" {
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break
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}
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if err != nil {
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panic(err)
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}
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me.appendTypeIndex(indexEntry)
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}
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fmt.Println("Done.")
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}
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func (me DailyDiskStorage) RebuildIndexes() {
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fmt.Print("Rebuilding indexes...");
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err := os.RemoveAll(me.indexesPath)
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if err != nil {
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panic(err)
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}
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err = os.MkdirAll(me.typesIndexesPath, 0777)
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if err != nil {
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panic(err)
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}
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fileList := make([]string, 0)
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err = filepath.Walk(me.storagePath, func(path string, f os.FileInfo, err error) error {
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if !f.IsDir() {
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fileList = append(fileList, path)
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}
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return nil
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})
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for _, file := range fileList {
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event := map[string]interface{} {}
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if content, err := ioutil.ReadFile(file); err != nil {
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panic(err)
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} else if parts := bytes.Split(content, CRLF); len(parts) == 0 {
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panic(errors.New(fmt.Sprintf("Empty event file %s", file)))
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} else if err := json.Unmarshal(parts[0], &event); err != nil {
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panic(err)
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} else {
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firstKey := string(bytes.Split(parts[0], []byte("\""))[1])
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streamId := event[firstKey].(string)
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streamUuid, err := uuid.FromString(streamId)
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if err != nil {
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panic(err)
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}
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if file[0:len(me.storagePath)] == me.storagePath {
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file = file[len(me.storagePath)+1:]
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}
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file = strings.Replace(file, "/", "", -1)
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parts := strings.Split(file, "_")
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typeId := parts[1]
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year, err := strconv.Atoi(file[0:4])
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if err != nil {
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panic(err)
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}
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month, err := strconv.Atoi(file[4:6])
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if err != nil {
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panic(err)
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}
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day, err := strconv.Atoi(file[6:8])
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if err != nil {
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panic(err)
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}
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hour, err := strconv.Atoi(file[8:10])
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if err != nil {
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panic(err)
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}
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min, err := strconv.Atoi(file[10:12])
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if err != nil {
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panic(err)
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}
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sec, err := strconv.Atoi(file[12:14])
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if err != nil {
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panic(err)
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}
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nsec, err := strconv.Atoi(file[14:23])
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if err != nil {
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panic(err)
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}
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loc, err := time.LoadLocation("Local")
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if err != nil {
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panic(err)
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}
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creationTime := time.Date(year, time.Month(month), day, hour, min, sec, nsec, loc)
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fmt.Printf("%s=%s %d %d %d %d %d %d %d %s\n", firstKey, streamId, year, month, day, hour, min, sec, nsec, typeId)
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index := &IndexEntry{streamUuid, creationTime, typeId}
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err = appendIndex(me.globalIndexFilename, index)
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if err != nil {
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panic(err)
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}
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err = appendIndex(me.getStreamIndexFilename(streamUuid), index)
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if err != nil {
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panic(err)
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}
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err = me.appendTypeIndex(index)
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if err != nil {
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panic(err)
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}
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}
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}
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} |