https://github.com/hekmon/transmissionrpc

transmissionrpcinitialplay.go

package main

import (
	"context"
	"fmt"
	"net/url"
	"os"

	"github.com/hekmon/transmissionrpc/v3"
)

func main() {

	
	endpoint, err := url.Parse("http://transmission:transmission@127.0.0.1:9091/transmission/rpc")
	if err != nil {
		panic(err)
	}
	client, err := transmissionrpc.New(endpoint, nil)
	if err != nil {
		panic(err)
	}

	// fmt.Println(client.SessionStats(context.TODO()))
	// fmt.Println(client.TorrentGetAll(context.TODO()))

	// torrents, err := client.TorrentGet(context.TODO(), []string{"status"}, []int64{54, 55})
	// if err != nil {
	// 	fmt.Fprintln(os.Stderr, err)
	// } else {
	// 	for _, torrent := range torrents {
	// 		fmt.Println(torrent.Status) // the only instanciated field, as requested
	// 	}
	// }


	freeSpace, totalSpace, err := client.FreeSpace(context.TODO(), "/var/lib/transmission-daemon/downloads")
    if err != nil {
        fmt.Fprintln(os.Stderr, err)
    } else  {
        fmt.Printf("Free space: %s | %d | %v\n", freeSpace, freeSpace, freeSpace)
        fmt.Printf("Total space: %s | %d | %v\n", totalSpace, totalSpace, totalSpace)
    }
}

https://github.com/transmission/transmission/tree/4.0.3/docs
https://github.com/transmission/transmission/blob/main/docs/Headless-Usage.md
http://127.0.0.1:9091/transmission/web/