Added chat microservice, removed air

chat-service/logic/logic.go

@@ -0,0 +1,70 @@
+package logic
+
+import (
+	"encoding/json"
+	"net/http"
+	"time"
+	"twitch-clone/chat-service/models"
+	"twitch-clone/chat-service/repository"
+	"twitch-clone/chat-service/serializer"
+
+	"github.com/bwmarrin/snowflake"
+	"github.com/olahol/melody"
+)
+
+type chatService struct {
+	ChatRepo      repository.ChatRepository
+	Melody        melody.Melody
+	MsgSerializer serializer.JsonMessageSerializer
+	Snowflake     snowflake.Node
+}
+
+func NewChatService(chatRepo repository.ChatRepository) *chatService {
+	flakeGen, err := snowflake.NewNode(0)
+	if err != nil {
+		panic(err)
+	}
+
+	c := &chatService{
+		ChatRepo:      chatRepo,
+		Melody:        *melody.New(),
+		MsgSerializer: serializer.JsonMessageSerializer{},
+		Snowflake:     *flakeGen,
+	}
+
+	c.Melody.HandleMessage(func(s *melody.Session, b []byte) {
+		msg, err := c.MsgSerializer.Decode(b)
+		if err != nil {
+			bytes, _ := json.Marshal(err.Error())
+			s.Write(bytes)
+			return
+		}
+		c.Publish(s.Request.URL.Path, msg)
+	})
+
+	return c
+}
+
+func (c *chatService) Subscribe(w http.ResponseWriter, r *http.Request) error {
+	return c.Melody.HandleRequest(w, r)
+}
+
+func (c *chatService) Publish(namespace string, msg *models.ChatMessage) error {
+	msg.MessageID = c.Snowflake.Generate().Int64()
+	msg.CreatedAt = time.Now().Unix()
+
+	rawMsg, err := c.MsgSerializer.Encode(msg)
+	if err != nil {
+		return err
+	}
+
+	err = c.Melody.BroadcastFilter(rawMsg, func(q *melody.Session) bool {
+		return q.Request.URL.Path == namespace
+	})
+	if err != nil {
+		return err
+	}
+
+	err = c.ChatRepo.Store(msg)
+	return err
+}