Chats (#96)

* stash

* replace chats sql with store

* strip unused method

chats/handler/list_messages.go

@@ -6,6 +6,7 @@ import (
 	"github.com/micro/micro/v3/service/auth"
 	"github.com/micro/micro/v3/service/errors"
 	"github.com/micro/micro/v3/service/logger"
+	"github.com/micro/micro/v3/service/store"
 	pb "github.com/micro/services/chats/proto"
 )
 
@@ -23,33 +24,46 @@ func (c *Chats) ListMessages(ctx context.Context, req *pb.ListMessagesRequest, r
 		return ErrMissingChatID
 	}
 
-	db, err := c.GetDBConn(ctx)
-	if err != nil {
-		logger.Errorf("Error connecting to DB: %v", err)
-		return errors.InternalServerError("DB_ERROR", "Error connecting to DB")
-	}
-	// construct the query
-	q := db.Where(&Message{ChatID: req.ChatId}).Order("sent_at DESC")
-	if req.SentBefore != nil {
-		q = q.Where("sent_at < ?", req.SentBefore.AsTime())
-	}
-	if req.Limit != nil {
-		q.Limit(int(req.Limit.Value))
-	} else {
-		q.Limit(DefaultLimit)
+	message := &Message{
+		ChatID: req.ChatId,
 	}
 
-	// execute the query
-	var msgs []Message
-	if err := q.Find(&msgs).Error; err != nil {
+	// default order is descending
+	order := store.OrderDesc
+	if req.Order == "asc" {
+		order = store.OrderAsc
+	}
+
+	opts := []store.ReadOption{
+		store.ReadPrefix(),
+		store.ReadOrder(order),
+	}
+
+	if req.Limit > 0 {
+		opts = append(opts, store.ReadLimit(uint(req.Limit)))
+	} else {
+		opts = append(opts, store.ReadLimit(uint(DefaultLimit)))
+	}
+	if req.Offset > 0 {
+		opts = append(opts, store.ReadOffset(uint(req.Offset)))
+	}
+
+	// read all the records with the chat ID suffix
+	recs, err := store.Read(message.Index(ctx), opts...)
+	if err != nil {
 		logger.Errorf("Error reading messages: %v", err)
 		return errors.InternalServerError("DATABASE_ERROR", "Error connecting to database")
 	}
 
-	// serialize the response
-	rsp.Messages = make([]*pb.Message, len(msgs))
-	for i, m := range msgs {
-		rsp.Messages[i] = m.Serialize()
+	// return all the messages
+	for _, rec := range recs {
+		m := &Message{}
+		rec.Decode(&m)
+		if len(m.ID) == 0 || m.ChatID != req.ChatId {
+			continue
+		}
+		rsp.Messages = append(rsp.Messages, m.Serialize())
 	}
+
 	return nil
 }