refactor: modularize downloader architecture

handlers.go

@@ -0,0 +1,110 @@
+package main
+
+import (
+	"io"
+	"strconv"
+	"strings"
+
+	"github.com/gin-gonic/gin"
+)
+
+func (a *App) search(c *gin.Context) {
+	keyword := strings.TrimSpace(c.Query("keyword"))
+	if keyword == "" {
+		c.JSON(400, gin.H{"error": "keyword required"})
+		return
+	}
+	source := c.DefaultQuery("source", "kw")
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	if page < 1 {
+		page = 1
+	}
+	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "20"))
+	if limit < 1 {
+		limit = 20
+	}
+	resp, err := a.am.Search(keyword, source, page, limit)
+	if err != nil {
+		c.JSON(502, gin.H{"error": err.Error()})
+		return
+	}
+	defer resp.Body.Close()
+	c.Status(resp.StatusCode)
+	_, _ = io.Copy(c.Writer, resp.Body)
+}
+
+func (a *App) listTasks(c *gin.Context) {
+	var ts []Task
+	if err := a.db.Order("id desc").Limit(100).Find(&ts).Error; err != nil {
+		c.JSON(500, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(200, gin.H{"data": ts})
+}
+
+func (a *App) addTask(c *gin.Context) {
+	var in SongRequest
+	if c.BindJSON(&in) != nil || in.RID == "" || in.Title == "" {
+		c.JSON(400, gin.H{"error": "source/rid/title required"})
+		return
+	}
+	if in.Source == "" {
+		in.Source = "kw"
+	}
+	if in.Quality == "" {
+		in.Quality = a.cfg.DefaultQuality
+	}
+	var existing Task
+	err := a.db.Where("source = ? AND r_id = ? AND quality = ?", in.Source, in.RID, in.Quality).Order("id desc").First(&existing).Error
+	if err == nil {
+		if existing.Status != "error" {
+			c.JSON(200, existing)
+			return
+		}
+		a.db.Model(&existing).Updates(map[string]any{"title": in.Title, "artist": in.Artist, "album": in.Album, "pic": in.Pic, "status": "pending", "error": ""})
+		a.queue <- existing.ID
+		c.JSON(202, existing)
+		return
+	}
+	t := Task{Source: in.Source, RID: in.RID, Title: in.Title, Artist: in.Artist, Album: in.Album, Pic: in.Pic, Quality: in.Quality, Status: "pending"}
+	if err := a.db.Create(&t).Error; err != nil {
+		if a.db.Where("source = ? AND r_id = ? AND quality = ?", in.Source, in.RID, in.Quality).Order("id desc").First(&existing).Error == nil {
+			c.JSON(200, existing)
+			return
+		}
+		c.JSON(500, gin.H{"error": err.Error()})
+		return
+	}
+	a.queue <- t.ID
+	c.JSON(202, t)
+}
+
+func (a *App) retryTask(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.Status(400)
+		return
+	}
+	var t Task
+	if a.db.First(&t, id).Error != nil {
+		c.Status(404)
+		return
+	}
+	a.db.Model(&t).Updates(map[string]any{"status": "pending", "error": "", "progress": 0, "downloaded_bytes": 0})
+	t.Status, t.Error, t.Progress, t.DownloadedBytes = "pending", "", 0, 0
+	a.queue <- t.ID
+	c.JSON(202, t)
+}
+
+func (a *App) deleteTask(c *gin.Context) {
+	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		c.Status(400)
+		return
+	}
+	if err := a.db.Delete(&Task{}, id).Error; err != nil {
+		c.JSON(500, gin.H{"error": err.Error()})
+		return
+	}
+	c.Status(204)
+}