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feed_service.go
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/
feed_service.go
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/*
* Copyright 2023 CloudWeGo Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package service
import (
"context"
"fmt"
"log"
"sync"
"time"
"github.com/cloudwego/hertz/pkg/app"
"github.com/cloudwego/hertz-examples/bizdemo/tiktok_demo/biz/dal/db"
feed "github.com/cloudwego/hertz-examples/bizdemo/tiktok_demo/biz/model/basic/feed"
"github.com/cloudwego/hertz-examples/bizdemo/tiktok_demo/biz/model/common"
user_service "github.com/cloudwego/hertz-examples/bizdemo/tiktok_demo/biz/service/user"
"github.com/cloudwego/hertz-examples/bizdemo/tiktok_demo/pkg/constants"
"github.com/cloudwego/hertz-examples/bizdemo/tiktok_demo/pkg/utils"
)
type FeedService struct {
ctx context.Context
c *app.RequestContext
}
// NewFeedService create feed service
func NewFeedService(ctx context.Context, c *app.RequestContext) *FeedService {
return &FeedService{ctx: ctx, c: c}
}
// Feed get the last ten videos until the deadline
func (s *FeedService) Feed(req *feed.DouyinFeedRequest) (*feed.DouyinFeedResponse, error) {
resp := &feed.DouyinFeedResponse{}
var lastTime time.Time
if req.LatestTime == 0 {
lastTime = time.Now()
} else {
lastTime = time.Unix(req.LatestTime/1000, 0)
}
fmt.Printf("LastTime: %v\n", lastTime)
current_user_id, exists := s.c.Get("current_user_id")
// 如果当前用户没有登陆,则将 current_user_id 赋值为 0
if !exists {
current_user_id = int64(0)
}
dbVideos, err := db.GetVideosByLastTime(lastTime)
if err != nil {
return resp, err
}
videos := make([]*common.Video, 0, constants.VideoFeedCount)
err = s.CopyVideos(&videos, &dbVideos, current_user_id.(int64))
if err != nil {
return resp, nil
}
resp.VideoList = videos
if len(dbVideos) != 0 {
resp.NextTime = dbVideos[len(dbVideos)-1].PublishTime.Unix()
}
return resp, nil
}
// CopyVideos use db.Video make feed.Video
func (s *FeedService) CopyVideos(result *[]*common.Video, data *[]*db.Video, userId int64) error {
for _, item := range *data {
video := s.createVideo(item, userId)
*result = append(*result, video)
}
return nil
}
// createVideo get video info by concurrent query
func (s *FeedService) createVideo(data *db.Video, userId int64) *common.Video {
video := &common.Video{
Id: data.ID,
// convert path in the db into a complete url accessible by the front end
PlayUrl: utils.URLconvert(s.ctx, s.c, data.PlayURL),
CoverUrl: utils.URLconvert(s.ctx, s.c, data.CoverURL),
Title: data.Title,
}
var wg sync.WaitGroup
wg.Add(4)
// Get author information
go func() {
author, err := user_service.NewUserService(s.ctx, s.c).GetUserInfo(data.AuthorID, userId)
if err != nil {
log.Printf("GetUserInfo func error:" + err.Error())
}
video.Author = &common.User{
Id: author.Id,
Name: author.Name,
FollowCount: author.FollowCount,
FollowerCount: author.FollowerCount,
IsFollow: author.IsFollow,
Avatar: author.Avatar,
BackgroundImage: author.BackgroundImage,
Signature: author.Signature,
TotalFavorited: author.TotalFavorited,
WorkCount: author.WorkCount,
FavoriteCount: author.FavoriteCount,
}
wg.Done()
}()
// Get the number of video likes
go func() {
err := *new(error)
video.FavoriteCount, err = db.GetFavoriteCount(data.ID)
if err != nil {
log.Printf("GetFavoriteCount func error:" + err.Error())
}
wg.Done()
}()
// Get comment count
go func() {
err := *new(error)
video.CommentCount, err = db.GetCommentCountByVideoID(data.ID)
if err != nil {
log.Printf("GetCommentCountByVideoID func error:" + err.Error())
}
wg.Done()
}()
// Get favorite exist
go func() {
err := *new(error)
video.IsFavorite, err = db.QueryFavoriteExist(userId, data.ID)
if err != nil {
log.Printf("QueryFavoriteExist func error:" + err.Error())
}
wg.Done()
}()
wg.Wait()
return video
}