app-cloudep-tweeting-service/internal/logic/postservice/like_logic.go

package postservicelogic

import (
	"app-cloudep-tweeting-service/internal/domain"
	model "app-cloudep-tweeting-service/internal/model/mongo"
	ers "code.30cm.net/digimon/library-go/errs"
	"context"

	"app-cloudep-tweeting-service/gen_result/pb/tweeting"
	"app-cloudep-tweeting-service/internal/svc"

	"github.com/zeromicro/go-zero/core/logx"
)

type LikeLogic struct {
	ctx    context.Context
	svcCtx *svc.ServiceContext
	logx.Logger
}

func NewLikeLogic(ctx context.Context, svcCtx *svc.ServiceContext) *LikeLogic {
	return &LikeLogic{
		ctx:    ctx,
		svcCtx: svcCtx,
		Logger: logx.WithContext(ctx),
	}
}

type likeReq struct {
	Target string `json:"target" validate:"required"`
	UID    string `json:"uid" validate:"required"`
}

// Like 點讚/取消讚 貼文
func (l *LikeLogic) Like(in *tweeting.LikeReq) (*tweeting.PostReactionActionResp, error) {
	// 驗證資料
	if err := l.svcCtx.Validate.ValidateAll(&likeReq{
		Target: in.TargetId,
		UID:    in.GetUid(),
	}); err != nil {
		return nil, ers.InvalidFormat(err.Error())
	}

	likeResp, err := l.svcCtx.PostLikeModel.LikeDislike(l.ctx, &model.PostLikes{
		TargetID: in.GetTargetId(),
		UID:      in.GetUid(),
		Type:     int8(in.GetLikeType()),
	})
	if err != nil {
		e := domain.PostMongoErrorL(
			logx.WithContext(l.ctx),
			[]logx.LogField{
				{Key: "req", Value: in},
				{Key: "func", Value: "PostModel.LikeDislike"},
				{Key: "err", Value: err},
			},
			"failed to like or dislike").Wrap(err)
		return nil, e
	}

	// 將文章的數量增加或減少的功能，是業務邏輯，從外面再決定要不要丟MQ 後算，或是怎麼算

	return &tweeting.PostReactionActionResp{
		PostID:       likeResp.PostID,
		ReactionType: int64(likeResp.ReactionType),
		IsIncrement:  likeResp.IsIncrement,
	}, nil
}