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93 lines
2.3 KiB
93 lines
2.3 KiB
package story
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import (
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"database/sql"
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"net/http"
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"time"
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"github.com/imdotdev/im.dev/server/pkg/db"
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"github.com/imdotdev/im.dev/server/pkg/e"
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)
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func Like(storyID string, userId string) *e.Error {
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exist := Exist(storyID)
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if !exist {
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return e.New(http.StatusNotFound, e.NotFound)
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}
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// 查询当前like状态
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liked := GetLiked(storyID, userId)
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var count int
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err := db.Conn.QueryRow("SELECT count FROM likes_count WHERE story_id=?", storyID).Scan(&count)
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if err != nil && err != sql.ErrNoRows {
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logger.Warn("query likes count error", "error", err)
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return e.New(http.StatusInternalServerError, e.Internal)
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}
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exist = !(err == sql.ErrNoRows)
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tx, err := db.Conn.Begin()
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if err != nil {
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logger.Warn("start like transaction error", "error", err)
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return e.New(http.StatusInternalServerError, e.Internal)
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}
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if liked {
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// 已经喜欢过该篇文章，更改为不喜欢
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_, err := tx.Exec("DELETE FROM likes WHERE story_id=? and user_id=?", storyID, userId)
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if err != nil {
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return e.New(http.StatusInternalServerError, e.Internal)
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}
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count = count - 1
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} else {
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_, err := tx.Exec("INSERT INTO likes (story_id,user_id,created) VALUES (?,?,?)", storyID, userId, time.Now())
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if err != nil {
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logger.Warn("add like error", "error", err)
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return e.New(http.StatusInternalServerError, e.Internal)
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}
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count = count + 1
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}
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var err0 error
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if !exist {
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_, err0 = tx.Exec("INSERT INTO likes_count (story_id,count) VALUES (?,?)", storyID, count)
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} else {
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_, err0 = tx.Exec("UPDATE likes_count SET count=? WHERE story_id=?", count, storyID)
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}
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if err0 != nil {
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logger.Warn("add like error", "error", err0)
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tx.Rollback()
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return e.New(http.StatusInternalServerError, e.Internal)
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}
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tx.Commit()
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return nil
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}
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func GetLiked(storyID string, userID string) bool {
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liked := false
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var nid string
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err := db.Conn.QueryRow("SELECT story_id FROM likes WHERE story_id=? and user_id=?", storyID, userID).Scan(&nid)
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if err != nil && err != sql.ErrNoRows {
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logger.Warn("query story like error", "error", err)
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return false
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}
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if nid == storyID {
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liked = true
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}
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return liked
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}
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func GetLikes(storyID string) int {
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var likes int
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err := db.Conn.QueryRow("SELECT count FROM likes_count WHERE story_id=?", storyID).Scan(&likes)
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if err != nil && err != sql.ErrNoRows {
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logger.Warn("get like count error", "error", err)
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}
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return likes
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}
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