librespot/metadata/src/lib.rs

#[macro_use]
extern crate log;

#[macro_use]
extern crate async_trait;

use protobuf::Message;

use librespot_core::session::Session;
use librespot_core::spotify_id::SpotifyId;

pub mod album;
pub mod artist;
pub mod audio;
pub mod availability;
pub mod content_rating;
pub mod copyright;
pub mod date;
pub mod episode;
pub mod error;
pub mod external_id;
pub mod image;
pub mod playlist;
mod request;
pub mod restriction;
pub mod sale_period;
pub mod show;
pub mod track;
mod util;
pub mod video;

use error::MetadataError;
use request::RequestResult;

#[async_trait]
pub trait Metadata: Send + Sized + 'static {
    type Message: protobuf::Message;

    // Request a protobuf
    async fn request(session: &Session, id: SpotifyId) -> RequestResult;

    // Request a metadata struct
    async fn get(session: &Session, id: SpotifyId) -> Result<Self, MetadataError> {
        let response = Self::request(session, id).await?;
        let msg = Self::Message::parse_from_bytes(&response)?;
        trace!("Received metadata: {:?}", msg);
        Self::parse(&msg, id)
    }

    fn parse(msg: &Self::Message, _: SpotifyId) -> Result<Self, MetadataError>;
}