Refactor Chats Service (#48)

chats/handler/chats.go

@@ -0,0 +1,61 @@
+package handler
+
+import (
+	"encoding/json"
+	"time"
+
+	pb "github.com/micro/services/chats/proto"
+
+	"github.com/micro/micro/v3/service/errors"
+	"google.golang.org/protobuf/types/known/timestamppb"
+	"gorm.io/gorm"
+)
+
+var (
+	ErrMissingID       = errors.BadRequest("MISSING_ID", "Missing ID")
+	ErrMissingAuthorID = errors.BadRequest("MISSING_AUTHOR_ID", "Missing Author ID")
+	ErrMissingText     = errors.BadRequest("MISSING_TEXT", "Missing text")
+	ErrMissingChatID   = errors.BadRequest("MISSING_CHAT_ID", "Missing Chat ID")
+	ErrMissingUserIDs  = errors.BadRequest("MISSING_USER_IDs", "Two or more user IDs are required")
+	ErrNotFound        = errors.NotFound("NOT_FOUND", "Chat not found")
+)
+
+type Chats struct {
+	DB   *gorm.DB
+	Time func() time.Time
+}
+
+type Chat struct {
+	ID        string
+	UserIDs   string `gorm:"uniqueIndex"` // sorted json array
+	CreatedAt time.Time
+}
+
+type Message struct {
+	ID       string
+	AuthorID string
+	ChatID   string
+	Text     string
+	SentAt   time.Time
+}
+
+func (m *Message) Serialize() *pb.Message {
+	return &pb.Message{
+		Id:       m.ID,
+		AuthorId: m.AuthorID,
+		ChatId:   m.ChatID,
+		Text:     m.Text,
+		SentAt:   timestamppb.New(m.SentAt),
+	}
+}
+
+func (c *Chat) Serialize() *pb.Chat {
+	var userIDs []string
+	json.Unmarshal([]byte(c.UserIDs), &userIDs)
+
+	return &pb.Chat{
+		Id:        c.ID,
+		UserIds:   userIDs,
+		CreatedAt: timestamppb.New(c.CreatedAt),
+	}
+}