Streams (#47)

* Streams Service (WIP)

* Complete Streams Service

streams/handler/delete_conversation.go

@@ -0,0 +1,34 @@
+package handler
+
+import (
+	"context"
+
+	"github.com/micro/micro/v3/service/errors"
+	"github.com/micro/micro/v3/service/logger"
+	pb "github.com/micro/services/streams/proto"
+	"gorm.io/gorm"
+)
+
+// Delete a conversation and all the messages within
+func (s *Streams) DeleteConversation(ctx context.Context, req *pb.DeleteConversationRequest, rsp *pb.DeleteConversationResponse) error {
+	// validate the request
+	if len(req.Id) == 0 {
+		return ErrMissingID
+	}
+
+	return s.DB.Transaction(func(tx *gorm.DB) error {
+		// delete all the messages
+		if err := tx.Where(&Message{ConversationID: req.Id}).Delete(&Message{}).Error; err != nil {
+			logger.Errorf("Error deleting messages: %v", err)
+			return errors.InternalServerError("DATABASE_ERROR", "Error connecting to database")
+		}
+
+		// delete the conversation
+		if err := tx.Where(&Conversation{ID: req.Id}).Delete(&Conversation{}).Error; err != nil {
+			logger.Errorf("Error deleting conversation: %v", err)
+			return errors.InternalServerError("DATABASE_ERROR", "Error connecting to database")
+		}
+
+		return nil
+	})
+}