Adding a simple server for goes using zeromq and an agnostic serializer

simpleserver/simpleserver.go

@@ -0,0 +1,97 @@
+package main
+
+import (
+	"fmt"
+	"github.com/pebbe/zmq4"
+	"github.com/satori/go.uuid"
+	"bitbucket.org/nicdex/adaptech-goes"
+	"os"
+	"path"
+	"encoding/binary"
+)
+
+func main() {
+	fmt.Println("Simple ZeroMQ server for goes.")
+
+	//TODO: config/flag
+	storagePath := path.Join(os.TempDir(), uuid.NewV4().String())
+
+	goes.SetStorage(goes.NewDiskStorage(storagePath))
+	goes.SetSerializer(goes.NewPassthruSerializer())
+
+	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()
+
+	//TODO: config/flag
+	listenAddr := "tcp://*:12345"
+	err = replySocket.Bind(listenAddr)
+	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 {
+				panic(err)
+			}
+			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 {
+				panic(err)
+			}
+			sendEvents(replySocket, events)
+		case "ReadAll":
+			fmt.Println(command)
+			events, err := goes.RetrieveAll()
+			if err != nil {
+				panic(err)
+			}
+			sendEvents(replySocket, events)
+		}
+	}
+}
+
+func sendEvents(socket *zmq4.Socket, events []*goes.Event) {
+	len := len(events)
+	lenBytes := make([]byte, 8)
+	binary.BigEndian.PutUint64(lenBytes, uint64(len))
+	socket.SendBytes(lenBytes, zmq4.SNDMORE)
+
+	i := 0
+	for ; i < len-1; i++ {
+		socket.SendBytes(events[i].Payload.([]byte), zmq4.SNDMORE)
+	}
+	socket.SendBytes(events[i].Payload.([]byte), 0)
+}