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94 lines
2.5 KiB
94 lines
2.5 KiB
package interaction
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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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"github.com/imdotdev/im.dev/server/pkg/models"
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)
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func Follow(targetID string, userId string) *e.Error {
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exist := models.IdExist(targetID)
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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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followed := GetFollowed(targetID, userId)
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var count int
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err := db.Conn.QueryRow("SELECT count FROM follows_count WHERE target_id=?", targetID).Scan(&count)
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if err != nil && err != sql.ErrNoRows {
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logger.Warn("query follows 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 sql transaction error", "error", err)
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return e.New(http.StatusInternalServerError, e.Internal)
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}
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if followed {
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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 follows WHERE user_id=? and target_id=?", userId, targetID)
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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 follows (user_id,target_id,target_type,created) VALUES (?,?,?,?)", userId, targetID, models.GetIDType(targetID), time.Now())
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if err != nil {
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logger.Warn("add follows 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 follows_count (target_id,count) VALUES (?,?)", targetID, count)
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} else {
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_, err0 = tx.Exec("UPDATE follows_count SET count=? WHERE target_id=?", count, targetID)
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}
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if err0 != nil {
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logger.Warn("add follows_count 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 GetFollowed(targetID string, userID string) bool {
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followed := false
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var nid string
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err := db.Conn.QueryRow("SELECT target_id FROM follows WHERE user_id=? and target_id=?", userID, targetID).Scan(&nid)
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if err != nil && err != sql.ErrNoRows {
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logger.Warn("query folloed error", "error", err)
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return false
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}
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if nid == targetID {
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followed = true
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}
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return followed
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}
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func GetFollows(targetID string) int {
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var follows int
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err := db.Conn.QueryRow("SELECT count FROM follows_count WHERE target_id=?", targetID).Scan(&follows)
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if err != nil && err != sql.ErrNoRows {
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logger.Warn("get follow count error", "error", err)
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}
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return follows
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}
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