CODEWITHSUNDEEP
rusterror-handlingtorrentmagnet-uribencoding
Konrad
Konrad

Reputation: 21

Why does Error handling gets Result<_, _>?

I have the following function in Rust. It converts all Torrent files to Magnet links. For some files it throws an Error. I wan't to skip those files

use rs_torrent_magnet;

pub fn build_cache(paths: Vec<PathBuf>, magnets: String, names: String){
    for path in paths{
        println!("Reading file: {:?}", path);
        let magnet = match rs_torrent_magnet::magnet_from_torrent_file(path) {
            Ok(magnet) => magnet,
            Err(e) => {
                eprintln!("Error reading magnet from torrent file: {:?}", e);
                return;
            }
        };
    }
}

But I get the following compiler error:

error[E0308]: mismatched types
  --> src/scraper.rs:33:13
   |
32 |         let magnet = match rs_torrent_magnet::magnet_from_torrent_file(path) {
   |                            ------------------------------------------------- this expression has type `std::string::String`
33 |             Ok(magnet) => magnet,
   |             ^^^^^^^^^^ expected `String`, found `Result<_, _>`
   |
   = note: expected struct `std::string::String`
                found enum `Result<_, _>`

Why does it return Result<_, _> instead of String?

Upvotes: 1

Views: 58

Answers (1)

cdhowie
cdhowie

Reputation: 169018

You're trying to treat the result of magnet_from_torrent_file as a Result, but it's not -- it's a String. This function may have a different way to signal errors, such as by panicking, but it's not documented so there isn't much to go on without digging into the internals.

Upvotes: 2

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