feat(aria2): add Aria2 download command and client integration

pkg/aria2/example/main.go

@@ -0,0 +1,97 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/krau/SaveAny-Bot/pkg/aria2"
+)
+
+func main() {
+	// Create aria2 client
+	client, err := aria2.NewClient("http://localhost:6800/jsonrpc", "")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	ctx := context.Background()
+
+	// Get aria2 version
+	version, err := client.GetVersion(ctx)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("aria2 version: %s\n", version.Version)
+	fmt.Printf("Enabled features: %v\n", version.EnabledFeatures)
+
+	// Add a download
+	uris := []string{"https://example.com/file.zip"}
+	options := aria2.Options{
+		"dir": "/downloads",
+	}
+
+	gid, err := client.AddURI(ctx, uris, options)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("Download started with GID: %s\n", gid)
+
+	// Monitor download progress
+	for {
+		status, err := client.TellStatus(ctx, gid)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		fmt.Printf("Status: %s, Progress: %s/%s bytes, Speed: %s bytes/s\n",
+			status.Status,
+			status.CompletedLength,
+			status.TotalLength,
+			status.DownloadSpeed,
+		)
+
+		if status.IsDownloadComplete() {
+			fmt.Println("Download completed!")
+			break
+		}
+
+		if status.IsDownloadError() {
+			fmt.Printf("Download error: %s\n", status.ErrorMessage)
+			break
+		}
+
+		time.Sleep(1 * time.Second)
+	}
+
+	// Get global statistics
+	stat, err := client.GetGlobalStat(ctx)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("Global stats - Download speed: %s, Active: %s, Waiting: %s\n",
+		stat.DownloadSpeed,
+		stat.NumActive,
+		stat.NumWaiting,
+	)
+
+	// List active downloads
+	activeDownloads, err := client.TellActive(ctx)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Printf("Active downloads: %d\n", len(activeDownloads))
+	for _, download := range activeDownloads {
+		fmt.Printf("  GID: %s, Status: %s\n", download.GID, download.Status)
+	}
+
+	// Example with context timeout
+	ctxWithTimeout, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	_, err = client.TellStatus(ctxWithTimeout, gid)
+	if err != nil {
+		log.Printf("Request failed: %v\n", err)
+	}
+}