Streams (#47)

* Streams Service (WIP)

* Complete Streams Service

streams/handler/create_conversation.go

@@ -0,0 +1,37 @@
+package handler
+
+import (
+	"context"
+
+	"github.com/google/uuid"
+	"github.com/micro/micro/v3/service/errors"
+	"github.com/micro/micro/v3/service/logger"
+	pb "github.com/micro/services/streams/proto"
+)
+
+// Create a conversation
+func (s *Streams) CreateConversation(ctx context.Context, req *pb.CreateConversationRequest, rsp *pb.CreateConversationResponse) error {
+	// validate the request
+	if len(req.GroupId) == 0 {
+		return ErrMissingGroupID
+	}
+	if len(req.Topic) == 0 {
+		return ErrMissingTopic
+	}
+
+	// write the conversation to the database
+	conv := &Conversation{
+		ID:        uuid.New().String(),
+		Topic:     req.Topic,
+		GroupID:   req.GroupId,
+		CreatedAt: s.Time(),
+	}
+	if err := s.DB.Create(conv).Error; err != nil {
+		logger.Errorf("Error creating conversation: %v", err)
+		return errors.InternalServerError("DATABASE_ERROR", "Error connecting to database")
+	}
+
+	// serialize the response
+	rsp.Conversation = conv.Serialize()
+	return nil
+}