Refactoring: re-organize project intro multiple packages (folders)

.gitignore

@@ -1 +1,3 @@
 .idea/
+goes
+goes.exe

README.md

@@ -26,16 +26,14 @@ In your GOPATH folder, execute the following commands:
   
 ### Compiling the binary
 
-In your GOPATH folder, execute the following command:
+In the project root folder, execute the following command:
 
-  `go build -o bin/goes src/github.com/adymitruk/goes/simpleserver/simpleserver.go`
-  
-\* Use `-o bin/goes.exe` on Windows
+  `go build`
   
 ## Running the server
 
-In your GOPATH folder, execute the following command:
+In the project root folder, execute the following command:
 
-  `./bin/goes --db=./events --addr=tcp://127.0.0.1:12345`
+  `./goes --db=./events --addr=tcp://127.0.0.1:12345`
 
 Both flags are optional and their default values are the same as the example.

actions/actions.go

@@ -0,0 +1,91 @@
+package actions
+
+import (
+	"time"
+	"github.com/satori/go.uuid"
+	storage "../storage"
+	serializer "../serializer"
+	data "../data"
+)
+
+var mapLock chan int = make(chan int, 1)
+var streamsLock map[string]chan int = make(map[string]chan int)
+
+type ActionsHandler struct {
+	storage storage.Storage
+	serializer serializer.Serializer
+}
+
+func NewActionsHandler(storage storage.Storage, serializer serializer.Serializer) *ActionsHandler {
+	return &ActionsHandler{storage, serializer}
+}
+
+func lockStream(streamName string) {
+	mapLock <- 1
+	defer func(){
+		<-mapLock
+	}()
+
+	streamLock := streamsLock[streamName]
+	if streamLock == nil {
+		streamLock = make(chan int, 1)
+		streamsLock[streamName] = streamLock
+	}
+
+	streamLock <- 1
+}
+
+func unlockStream(streamName string) {
+	<-streamsLock[streamName]
+}
+
+func (me ActionsHandler) AddEvent(event data.Event) error {
+	streamName := event.AggregateId.String()
+
+	lockStream(streamName)
+	defer unlockStream(streamName)
+
+	serializedPayload, typeId, err := me.serializer.Serialize(event.Payload)
+	if err != nil {
+		return err
+	}
+
+	return me.storage.Write(&storage.StoredEvent{StreamId: event.AggregateId, CreationTime: time.Now(), TypeId: typeId, Data: serializedPayload})
+}
+
+func (me ActionsHandler) RetrieveFor(aggregateId uuid.UUID) ([]*data.Event, error) {
+	results, err := me.storage.ReadStream(aggregateId)
+	if err != nil {
+		return nil, err
+	}
+
+	events := make([]*data.Event, 0)
+	for _, storedEvent := range results {
+		event, err := me.serializer.Deserialize(storedEvent.Data, storedEvent.TypeId)
+		if err != nil {
+			return nil, err
+		}
+		events = append(events, &data.Event{AggregateId: storedEvent.StreamId, Payload: event})
+	}
+
+	return events, nil
+}
+
+func (me ActionsHandler) RetrieveAll() ([]*data.Event, error) {
+	results, err := me.storage.ReadAll()
+	if err != nil {
+		return nil, err
+	}
+
+	events := make([]*data.Event, 0)
+	for _, storedEvent := range results {
+		event, err := me.serializer.Deserialize(storedEvent.Data, storedEvent.TypeId)
+		if err != nil {
+			return nil, err
+		}
+		events = append(events, &data.Event{AggregateId: storedEvent.StreamId, Payload: event})
+	}
+
+	return events, nil
+}
+

data/event.go

@@ -0,0 +1,15 @@
+package data
+
+import (
+	"github.com/satori/go.uuid"
+	"reflect"
+)
+
+type Event struct {
+	AggregateId uuid.UUID
+	Payload     interface{}
+}
+
+func (me *Event) Equals(other *Event) bool {
+	return me.AggregateId == other.AggregateId && reflect.DeepEqual(me.Payload, other.Payload)
+}

goes.go

@@ -1,94 +1,123 @@
-package goes
+package main
 
 import (
+	"fmt"
+	actions "./actions"
+	storage "./storage"
+	serializer "./serializer"
+	data "./data"
 	"github.com/satori/go.uuid"
-	"time"
+	"github.com/pebbe/zmq4"
+	"flag"
+	"os"
+	"path"
 )
 
-var serializer Serializer
-var storage Storage
+var addr = flag.String("addr", "tcp://127.0.0.1:12345", "zeromq address to listen to")
+var db = flag.String("db", fmt.Sprintf(".%cevents", os.PathSeparator), "path for storage")
 
-type Event struct {
-	AggregateId uuid.UUID
-	Payload     interface{}
+func PathIsAbsolute(s string) bool {
+	if len(s) > 1 && s[1] == ':' {
+		return true
+	}
+	return path.IsAbs(s)
 }
 
-func SetStorage(newStorage Storage) {
-	storage = newStorage
-}
+func main() {
+	fmt.Println("Simple ZeroMQ server for goes.")
 
-func SetSerializer(newSerializer Serializer) {
-	serializer = newSerializer
-}
+	flag.Parse()
 
-var mapLock chan int = make(chan int, 1)
-var streamsLock map[string]chan int = make(map[string]chan int)
-
-func lockStream(streamName string) {
-	mapLock <- 1
-	defer func(){
-		<-mapLock
-	}()
-
-	streamLock := streamsLock[streamName]
-	if streamLock == nil {
-		streamLock = make(chan int, 1)
-		streamsLock[streamName] = streamLock
+	storagePath := *db
+	if !PathIsAbsolute(storagePath) {
+		wd, _ := os.Getwd()
+		storagePath = path.Join(wd, storagePath)
 	}
 
-	streamLock <- 1
-}
+	fmt.Println("Listening on:", *addr)
+	fmt.Println("Storage path:", storagePath)
 
-func unlockStream(streamName string) {
-	<-streamsLock[streamName]
-}
+	var handler = actions.NewActionsHandler(storage.NewDailyDiskStorage(storagePath), serializer.NewPassthruSerializer())
 
-func AddEvent(event Event) error {
-	streamName := event.AggregateId.String()
-
-	lockStream(streamName)
-	defer unlockStream(streamName)
-
-	serializedPayload, typeId, err := serializer.Serialize(event.Payload)
+	context, err := zmq4.NewContext()
 	if err != nil {
-		return err
+		panic(err)
 	}
+	defer context.Term()
 
-	return storage.Write(&StoredEvent{event.AggregateId, time.Now(), typeId, serializedPayload})
-}
-
-func RetrieveFor(aggregateId uuid.UUID) ([]*Event, error) {
-	results, err := storage.ReadStream(aggregateId)
+	replySocket, err := context.NewSocket(zmq4.REP)
 	if err != nil {
-		return nil, err
+		panic(err)
+	}
+	defer replySocket.Close()
+
+	err = replySocket.Bind(*addr)
+	if err != nil {
+		panic(err)
 	}
 
-	events := make([]*Event, 0)
-	for _, storedEvent := range results {
-		event, err := serializer.Deserialize(storedEvent.Data, storedEvent.TypeId)
+	for {
+		message, err := replySocket.RecvMessageBytes(0)
 		if err != nil {
-			return nil, err
+			fmt.Println("Error receiving command from client", err)
+			continue
 		}
-		events = append(events, &Event{storedEvent.StreamId, event})
-	}
 
-	return events, nil
+		command := string(message[0])
+		switch command {
+		case "AddEvent":
+			aggregateId, err := uuid.FromBytes(message[1])
+			if err != nil {
+				fmt.Println("Wrong format for AggregateId", err)
+				break
+			}
+			fmt.Println("->", command, aggregateId.String())
+			payload := message[2]
+			err = handler.AddEvent(data.Event{AggregateId: aggregateId, Payload: payload})
+			if err != nil {
+				replySocket.Send(fmt.Sprintf("Error: %v", err), 0)
+				fmt.Println(err)
+				break
+			}
+			replySocket.Send("Ok", 0)
+		case "ReadStream":
+			aggregateId, err := uuid.FromBytes(message[1])
+			if err != nil {
+				fmt.Println("Wrong format for AggregateId", err)
+				break
+			}
+			fmt.Println("->", command, aggregateId.String())
+			events, err := handler.RetrieveFor(aggregateId)
+			if err != nil {
+				replySocket.Send(fmt.Sprintf("Error: %v", err), 0)
+				fmt.Println(err)
+				break
+			}
+			sendEvents(replySocket, events)
+		case "ReadAll":
+			fmt.Println("->", command)
+			events, err := handler.RetrieveAll()
+			if err != nil {
+				replySocket.Send(fmt.Sprintf("Error: %v", err), 0)
+				fmt.Println(err)
+				break
+			}
+			sendEvents(replySocket, events)
+		case "Shutdown":
+			fmt.Println("->", command)
+			return
+		}
+	}
 }
 
-func RetrieveAll() ([]*Event, error) {
-	results, err := storage.ReadAll()
-	if err != nil {
-		return nil, err
-	}
+func sendEvents(socket *zmq4.Socket, events []*data.Event) {
+	len := len(events)
+	socket.Send(fmt.Sprintf("%v", len), zmq4.SNDMORE)
 
-	events := make([]*Event, 0)
-	for _, storedEvent := range results {
-		event, err := serializer.Deserialize(storedEvent.Data, storedEvent.TypeId)
-		if err != nil {
-			return nil, err
-		}
-		events = append(events, &Event{storedEvent.StreamId, event})
+	i := 0
+	for ; i < len-1; i++ {
+		socket.SendBytes(events[i].Payload.([]byte), zmq4.SNDMORE)
 	}
-
-	return events, nil
+	socket.SendBytes(events[i].Payload.([]byte), 0)
+	fmt.Println("<-", len, "events")
 }

goes_test.go

@@ -1,4 +1,4 @@
-package goes
+package main
 
 import
 (
@@ -6,12 +6,18 @@ import
 	"github.com/satori/go.uuid"
 	"os"
 	"path"
-	"reflect"
 	"io/ioutil"
 	"bytes"
+	storage "./storage"
+	serializer "./serializer"
+	data "./data"
+	actions "./actions"
 )
 
 var tempDir string
+var handler *actions.ActionsHandler
+var _storage storage.Storage
+var _serializer serializer.Serializer
 
 type AnEvent struct {
 	A int64
@@ -26,10 +32,9 @@ type AnotherEvent struct {
 
 func setUp() {
 	tempDir := path.Join(os.TempDir(), uuid.NewV4().String())
-	storage := NewDiskStorage(tempDir)
-	SetStorage(storage)
-	serializer := NewJsonSerializer((*AnEvent)(nil), (*AnotherEvent)(nil))
-	SetSerializer(serializer)
+	_storage = storage.NewSimpleDiskStorage(tempDir)
+	_serializer = serializer.NewJsonSerializer((*AnEvent)(nil), (*AnotherEvent)(nil))
+	handler = actions.NewActionsHandler(_storage, _serializer)
 }
 
 func tearDown() {
@@ -39,8 +44,8 @@ func tearDown() {
 	}
 }
 
-func wrapEvent(aggregateId uuid.UUID, event interface{}) Event {
-	return Event{aggregateId, event}
+func wrapEvent(aggregateId uuid.UUID, event interface{}) data.Event {
+	return data.Event{AggregateId: aggregateId, Payload: event}
 }
 
 func TestSerializeEventToJson(t *testing.T) {
@@ -48,13 +53,13 @@ func TestSerializeEventToJson(t *testing.T) {
 	defer tearDown()
 
 	ev := wrapEvent(uuid.NewV4(), AnEvent{int64(1024), "Tests"})
-	err := AddEvent(ev)
+	err := handler.AddEvent(ev)
 	if err != nil {
 		t.Errorf("AddEvent failed with %q", err)
 		return
 	}
 
-	filename := (storage.(*DiskStorage)).getFilenameForEvents(ev.AggregateId.String());
+	filename := (_storage.(*storage.SimpleDiskStorage)).GetFilenameForEvents(ev.AggregateId.String());
 	if fi, _ := os.Stat(filename); fi == nil {
 		t.Errorf("AddEvent failed to create file %q", filename)
 		return
@@ -72,19 +77,19 @@ func TestSerializeEventsForSameAggregateInSameFile(t *testing.T) {
 
 	aggregateId := uuid.NewV4()
 	ev1 := wrapEvent(aggregateId, AnEvent{int64(12345), "Hello"})
-	err := AddEvent(ev1)
+	err := handler.AddEvent(ev1)
 	if err != nil {
 		t.Errorf("AddEvent failed with %q", err)
 		return
 	}
 	ev2 := wrapEvent(aggregateId, AnotherEvent{int64(23456), "Bob", 123.45})
-	err = AddEvent(ev2)
+	err = handler.AddEvent(ev2)
 	if err != nil {
 		t.Errorf("AddEvent failed with %q", err)
 		return
 	}
 
-	filename := (storage.(*DiskStorage)).getFilenameForEvents(aggregateId.String())
+	filename := (_storage.(*storage.SimpleDiskStorage)).GetFilenameForEvents(aggregateId.String())
 	content, _ := ioutil.ReadFile(filename)
 	if !bytes.Contains(content, []byte("Hello")) || !bytes.Contains(content, []byte("Bob")) {
 		t.Error("AddEvent failed. Both events are not serialized in same file.")
@@ -97,13 +102,13 @@ func TestTypeInformationIsProvided(t *testing.T) {
 	defer tearDown()
 
 	ev := wrapEvent(uuid.NewV4(), AnEvent{int64(1024), "Tests"})
-	err := AddEvent(ev)
+	err := handler.AddEvent(ev)
 	if err != nil {
 		t.Errorf("AddEvent failed with %q", err)
 		return
 	}
 
-	filename := (storage.(*DiskStorage)).getFilenameForEvents(ev.AggregateId.String());
+	filename := (_storage.(*storage.SimpleDiskStorage)).GetFilenameForEvents(ev.AggregateId.String());
 	if fi, _ := os.Stat(filename); fi == nil {
 		t.Errorf("AddEvent failed to create file %q", filename)
 		return
@@ -115,29 +120,25 @@ func TestTypeInformationIsProvided(t *testing.T) {
 	}
 }
 
-func (me *Event) Equals(other *Event) bool {
-	return me.AggregateId == other.AggregateId && reflect.DeepEqual(me.Payload, other.Payload)
-}
-
 func TestEventsCanBeRetrieved(t *testing.T) {
 	setUp()
 	defer tearDown()
 
 	aggregateId := uuid.NewV4()
 	ev1 := wrapEvent(aggregateId, AnEvent{int64(12345), "Hello"})
-	err := AddEvent(ev1)
+	err := handler.AddEvent(ev1)
 	if err != nil {
 		t.Errorf("AddEvent failed with %q", err)
 		return
 	}
 	ev2 := wrapEvent(aggregateId, AnotherEvent{int64(23456), "Bob", 123.45})
-	err = AddEvent(ev2)
+	err = handler.AddEvent(ev2)
 	if err != nil {
 		t.Errorf("AddEvent failed with %q", err)
 		return
 	}
 
-	events, err := RetrieveFor(aggregateId)
+	events, err := handler.RetrieveFor(aggregateId)
 	switch {
 	case err != nil:
 		t.Errorf("RetrieveFor(%q) failed with %q", aggregateId.String(), err)
@@ -159,11 +160,11 @@ func TestEventsCanBeReplayedInOrder(t *testing.T) {
 	testEvent1 := wrapEvent(aggregateId1, AnEvent{int64(123), "Hello 1"})
 	testEvent2 := wrapEvent(aggregateId2, AnEvent{int64(456), "Hello 2"})
 	testEvent3 := wrapEvent(aggregateId1, AnEvent{int64(789), "Hello 3"})
-	AddEvent(testEvent1)
-	AddEvent(testEvent2)
-	AddEvent(testEvent3)
+	handler.AddEvent(testEvent1)
+	handler.AddEvent(testEvent2)
+	handler.AddEvent(testEvent3)
 
-	events, err := RetrieveAll()
+	events, err := handler.RetrieveAll()
 	switch {
 	case err != nil:
 		t.Errorf("RetrieveAll failed with %q", err)

serializer/json.go

@@ -1,4 +1,4 @@
-package goes
+package serializer
 
 import (
 	"reflect"
@@ -6,12 +6,6 @@ import (
 	"errors"
 )
 
-type Serializer interface {
-	Serialize(interface{}) ([]byte, string, error)
-	Deserialize([]byte, string) (interface{}, error)
-}
-
-//TODO: any serializer will require a type registry maybe this should be abstracted
 type JsonSerializer struct {
 	types map[string]reflect.Type
 }

serializer/passthru.go

@@ -0,0 +1,38 @@
+package serializer
+
+import (
+	"bytes"
+	"errors"
+)
+
+type PassthruSerializer struct {}
+
+func NewPassthruSerializer() *PassthruSerializer {
+	return &PassthruSerializer{}
+}
+
+func (me PassthruSerializer) Serialize(input interface{}) (output []byte, typeId string, err error) {
+	content, ok := input.([]byte)
+	if !ok {
+		err = errors.New("input should be []byte")
+		return
+	}
+
+	sep := bytes.IndexByte(content, ' ')
+	if sep == -1 {
+		err = errors.New("missing split char.")
+		return
+	}
+
+	output = content[sep+1:]
+	typeId = string(content[0:sep])
+	return
+}
+
+func (me PassthruSerializer) Deserialize(input []byte, typeId string) (interface{}, error) {
+	output := []byte(typeId)
+	output = append(output, ' ')
+	output = append(output, input...)
+
+	return output, nil
+}

serializer/serializer.go

@@ -0,0 +1,6 @@
+package serializer
+
+type Serializer interface {
+	Serialize(interface{}) ([]byte, string, error)
+	Deserialize([]byte, string) (interface{}, error)
+}

simpleserver/simpleserver.go

@@ -12,143 +12,3 @@ import (
 	"path"
 )
 
-var addr = flag.String("addr", "tcp://127.0.0.1:12345", "zeromq address to listen to")
-var db = flag.String("db", fmt.Sprintf(".%cevents", os.PathSeparator), "path for storage")
-
-type Serializer struct {}
-
-func NewSerializer() goes.Serializer {
-	return &Serializer{}
-}
-
-func (me Serializer) Serialize(input interface{}) (output []byte, typeId string, err error) {
-	content, ok := input.([]byte)
-	if !ok {
-		err = errors.New("input should be []byte")
-		return
-	}
-
-	sep := bytes.IndexByte(content, ' ')
-	if sep == -1 {
-		err = errors.New("missing split char.")
-		return
-	}
-
-	output = content[sep+1:]
-	typeId = string(content[0:sep])
-	return
-}
-
-func (me Serializer) Deserialize(input []byte, typeId string) (interface{}, error) {
-	output := []byte(typeId)
-	output = append(output, ' ')
-	output = append(output, input...)
-
-	return output, nil
-}
-
-func PathIsAbsolute(s string) bool {
-	if len(s) > 1 && s[1] == ':' {
-		return true
-	}
-	return path.IsAbs(s)
-}
-
-func main() {
-	fmt.Println("Simple ZeroMQ server for goes.")
-
-	flag.Parse()
-
-	storagePath := *db
-	if !PathIsAbsolute(storagePath) {
-		wd, _ := os.Getwd()
-		storagePath = path.Join(wd, storagePath)
-	}
-
-	fmt.Println("Listening on:", *addr)
-	fmt.Println("Storage path:", storagePath)
-	goes.SetStorage(goes.NewReadableDiskStorage(storagePath))
-	goes.SetSerializer(NewSerializer())
-
-	context, err := zmq4.NewContext()
-	if err != nil {
-		panic(err)
-	}
-	defer context.Term()
-
-	replySocket, err := context.NewSocket(zmq4.REP)
-	if err != nil {
-		panic(err)
-	}
-	defer replySocket.Close()
-
-	err = replySocket.Bind(*addr)
-	if err != nil {
-		panic(err)
-	}
-
-	for {
-		message, err := replySocket.RecvMessageBytes(0)
-		if err != nil {
-			fmt.Println("Error receiving command from client", err)
-			continue
-		}
-
-		command := string(message[0])
-		switch command {
-		case "AddEvent":
-			aggregateId, err := uuid.FromBytes(message[1])
-			if err != nil {
-				fmt.Println("Wrong format for AggregateId", err)
-				break
-			}
-			fmt.Println("->", command, aggregateId.String())
-			data := message[2]
-			err = goes.AddEvent(goes.Event{aggregateId, data})
-			if err != nil {
-				replySocket.Send(fmt.Sprintf("Error: %v", err), 0)
-				fmt.Println(err)
-				break
-			}
-			replySocket.Send("Ok", 0)
-		case "ReadStream":
-			aggregateId, err := uuid.FromBytes(message[1])
-			if err != nil {
-				fmt.Println("Wrong format for AggregateId", err)
-				break
-			}
-			fmt.Println("->", command, aggregateId.String())
-			events, err := goes.RetrieveFor(aggregateId)
-			if err != nil {
-				replySocket.Send(fmt.Sprintf("Error: %v", err), 0)
-				fmt.Println(err)
-				break
-			}
-			sendEvents(replySocket, events)
-		case "ReadAll":
-			fmt.Println("->", command)
-			events, err := goes.RetrieveAll()
-			if err != nil {
-				replySocket.Send(fmt.Sprintf("Error: %v", err), 0)
-				fmt.Println(err)
-				break
-			}
-			sendEvents(replySocket, events)
-		case "Shutdown":
-			fmt.Println("->", command)
-			return
-		}
-	}
-}
-
-func sendEvents(socket *zmq4.Socket, events []*goes.Event) {
-	len := len(events)
-	socket.Send(fmt.Sprintf("%v", len), zmq4.SNDMORE)
-
-	i := 0
-	for ; i < len-1; i++ {
-		socket.SendBytes(events[i].Payload.([]byte), zmq4.SNDMORE)
-	}
-	socket.SendBytes(events[i].Payload.([]byte), 0)
-	fmt.Println("<-", len, "events")
-}

storage/dailydisk.go

@@ -1,4 +1,4 @@
-package goes
+package storage
 
 import (
 	"path"
@@ -10,26 +10,26 @@ import (
 	"io/ioutil"
 )
 
-type ReadableDiskStorage struct {
+type DailyDiskStorage struct {
 	storagePath string
 	indexesPath string
 	globalIndexFilename string
 }
 
-func NewReadableDiskStorage(storagePath string) Storage {
+func NewDailyDiskStorage(storagePath string) Storage {
 	indexesPath := path.Join(storagePath, "indexes")
 	globalIndexPath := path.Join(indexesPath, "global")
 	if err := os.MkdirAll(indexesPath, 0777); err != nil {
 		panic(err)
 	}
-	return &ReadableDiskStorage{storagePath, indexesPath, globalIndexPath};
+	return &DailyDiskStorage{storagePath, indexesPath, globalIndexPath};
 }
 
-func (me ReadableDiskStorage) getStreamIndexFilename(streamId uuid.UUID) string {
+func (me DailyDiskStorage) getStreamIndexFilename(streamId uuid.UUID) string {
 	return path.Join(me.indexesPath, streamId.String())
 }
 
-func (me ReadableDiskStorage) getEventFilename(creationTime time.Time, typeId string) string {
+func (me DailyDiskStorage) getEventFilename(creationTime time.Time, typeId string) string {
 	yearMonth := fmt.Sprintf("%04d%02d", creationTime.Year(), creationTime.Month())
 	day := fmt.Sprintf("%02d", creationTime.Day())
 	eventFilename := fmt.Sprintf("%02d%02d%02d%09d_%s", creationTime.Hour(), creationTime.Minute(), creationTime.Second(), creationTime.Nanosecond(), typeId)
@@ -110,7 +110,7 @@ func readEvent(filename string) ([]byte, error) {
 	return ioutil.ReadFile(filename)
 }
 
-func (me ReadableDiskStorage) Write(event *StoredEvent) error {
+func (me DailyDiskStorage) Write(event *StoredEvent) error {
 
 	eventFilename := me.getEventFilename(event.CreationTime, event.TypeId)
 	os.MkdirAll(path.Dir(eventFilename), 0777)
@@ -135,7 +135,7 @@ func (me ReadableDiskStorage) Write(event *StoredEvent) error {
 	return nil
 }
 
-func (me ReadableDiskStorage) ReadStream(streamId uuid.UUID) ([]*StoredEvent, error) {
+func (me DailyDiskStorage) ReadStream(streamId uuid.UUID) ([]*StoredEvent, error) {
 
 	indexFile, err := os.OpenFile(me.getStreamIndexFilename(streamId), os.O_RDONLY, 0)
 	if err != nil {
@@ -163,7 +163,7 @@ func (me ReadableDiskStorage) ReadStream(streamId uuid.UUID) ([]*StoredEvent, er
 	return events, nil
 }
 
-func (me ReadableDiskStorage) ReadAll() ([]*StoredEvent, error) {
+func (me DailyDiskStorage) ReadAll() ([]*StoredEvent, error) {
 	indexFile, err := os.OpenFile(me.globalIndexFilename, os.O_RDONLY, 0)
 	if err != nil {
 		return nil, err

storage/dailydisk_test.go

@@ -1,4 +1,4 @@
-package goes
+package storage
 
 import (
 	"testing"
@@ -13,7 +13,7 @@ func TestAddEvent(t *testing.T) {
 	//Arrange
 	storagePath := path.Join(os.TempDir(), uuid.NewV4().String())
 	defer os.RemoveAll(storagePath)
-	storage := NewReadableDiskStorage(storagePath)
+	storage := NewDailyDiskStorage(storagePath)
 
 	aLocation, _ := time.LoadLocation("")
 	aTime := time.Date(2016,2,11,9,53,32,1234567, aLocation)
@@ -29,7 +29,7 @@ func TestAddEvent(t *testing.T) {
 		t.Errorf("Write failed. Error: %v", err)
 	}
 
-	readableDiskStorage := storage.(*ReadableDiskStorage)
+	readableDiskStorage := storage.(*DailyDiskStorage)
 
 	globalIndexFi, _ := os.Stat(readableDiskStorage.globalIndexFilename)
 	if globalIndexFi == nil {
@@ -51,7 +51,7 @@ func TestReadStream(t *testing.T) {
 	//Arrange
 	storagePath := path.Join(os.TempDir(), uuid.NewV4().String())
 	defer os.RemoveAll(storagePath)
-	storage := NewReadableDiskStorage(storagePath)
+	storage := NewDailyDiskStorage(storagePath)
 
 	streamId := uuid.NewV4()
 	ev1 := &StoredEvent{streamId, time.Now(), "1stType", []byte("1stEvent")}
@@ -85,7 +85,7 @@ func TestReadAll(t *testing.T) {
 	//Arrange
 	storagePath := path.Join(os.TempDir(), uuid.NewV4().String())
 	defer os.RemoveAll(storagePath)
-	storage := NewReadableDiskStorage(storagePath)
+	storage := NewDailyDiskStorage(storagePath)
 
 	stream1Id := uuid.NewV4()
 	stream2Id := uuid.NewV4()

storage/simpledisk.go

@@ -1,46 +1,29 @@
-package goes
+package storage
 
 import (
-	"os"
-	"path"
 	"encoding/binary"
 	"github.com/satori/go.uuid"
+	"os"
+	"time"
+	"path"
 	"fmt"
 	"errors"
-	"time"
 )
 
-const IntegerSizeInBytes = 8
-const StreamStartingCapacity = 512
-
-type StoredEvent struct {
-	StreamId uuid.UUID
-	CreationTime time.Time
-	TypeId string
-	Data []byte
+func NewSimpleDiskStorage(storagePath string) Storage {
+	return &SimpleDiskStorage{storagePath, path.Join(storagePath, "eventindex")}
 }
 
-//TODO: performance - change reads array for some kind of iterator
-type Storage interface {
-	Write(event *StoredEvent) error
-	ReadStream(streamId uuid.UUID) ([]*StoredEvent, error)
-	ReadAll() ([]*StoredEvent, error)
-}
-
-func NewDiskStorage(storagePath string) Storage {
-	return &DiskStorage{storagePath, path.Join(storagePath, "eventindex")}
-}
-
-type DiskStorage struct {
+type SimpleDiskStorage struct {
 	storagePath string
 	indexPath string
 }
 
-func (me DiskStorage) getFilename(stream, extension string) string {
+func (me SimpleDiskStorage) getFilename(stream, extension string) string {
 	return fmt.Sprintf("%v%v", path.Join(me.storagePath, stream[0:2], stream[2:]), extension)
 }
 
-func (me DiskStorage) getFilenameForEvents(stream string) string {
+func (me SimpleDiskStorage) GetFilenameForEvents(stream string) string {
 	return me.getFilename(stream, ".history")
 }
 
@@ -90,8 +73,8 @@ func readSizedBytes(f *os.File) ([]byte, error) {
 	return data, nil
 }
 
-func (me DiskStorage) Write(event *StoredEvent) error {
-	filename := me.getFilenameForEvents(event.StreamId.String())
+func (me SimpleDiskStorage) Write(event *StoredEvent) error {
+	filename := me.GetFilenameForEvents(event.StreamId.String())
 	os.MkdirAll(path.Dir(filename), os.ModeDir)
 
 	indexFile, err := os.OpenFile(me.indexPath, os.O_APPEND | os.O_WRONLY | os.O_CREATE, 0644)
@@ -128,10 +111,10 @@ func (me DiskStorage) Write(event *StoredEvent) error {
 	return nil
 }
 
-func (me DiskStorage) ReadStream(streamId uuid.UUID) ([]*StoredEvent, error) {
+func (me SimpleDiskStorage) ReadStream(streamId uuid.UUID) ([]*StoredEvent, error) {
 	streamName := streamId.String()
 	offset := int64(0) //TODO snapshots
-	filename := me.getFilenameForEvents(streamName)
+	filename := me.GetFilenameForEvents(streamName)
 
 	eventsFile, err := os.OpenFile(filename, os.O_RDONLY, 0)
 	if err != nil {
@@ -157,7 +140,7 @@ func (me DiskStorage) ReadStream(streamId uuid.UUID) ([]*StoredEvent, error) {
 	return results, nil
 }
 
-func (me DiskStorage) ReadAll() ([]*StoredEvent, error) {
+func (me SimpleDiskStorage) ReadAll() ([]*StoredEvent, error) {
 	indexFile, err := os.OpenFile(me.indexPath, os.O_RDONLY, 0)
 	if err != nil {
 		return nil, err
@@ -198,8 +181,8 @@ func (me DiskStorage) ReadAll() ([]*StoredEvent, error) {
 	return results, nil
 }
 
-func (me DiskStorage) retrieveStoredEvent(streamId uuid.UUID, offset int64) (*StoredEvent, error) {
-	filename := me.getFilenameForEvents(streamId.String())
+func (me SimpleDiskStorage) retrieveStoredEvent(streamId uuid.UUID, offset int64) (*StoredEvent, error) {
+	filename := me.GetFilenameForEvents(streamId.String())
 
 	eventsFile, err := os.OpenFile(filename, os.O_RDONLY, 0)
 	if err != nil {
@@ -238,3 +221,4 @@ func getStoredData(eventsFile *os.File) (creationTime time.Time, typeId string,
 
 	return
 }
+

storage/storage.go

@@ -0,0 +1,23 @@
+package storage
+
+import (
+	"github.com/satori/go.uuid"
+	"time"
+)
+
+const IntegerSizeInBytes = 8
+const StreamStartingCapacity = 512
+
+type StoredEvent struct {
+	StreamId uuid.UUID
+	CreationTime time.Time
+	TypeId string
+	Data []byte
+}
+
+//TODO: performance - change reads array for some kind of iterator
+type Storage interface {
+	Write(event *StoredEvent) error
+	ReadStream(streamId uuid.UUID) ([]*StoredEvent, error)
+	ReadAll() ([]*StoredEvent, error)
+}