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/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2025 metamuffin <metamuffin.org>
*/
use crate::USER_AGENT;
use anyhow::Result;
use bincode::{Decode, Encode};
use jellybase::cache::async_cache_memory;
use reqwest::{
header::{HeaderMap, HeaderName, HeaderValue},
Client, ClientBuilder,
};
use serde::Deserialize;
use std::{collections::BTreeMap, sync::Arc, time::Duration};
use tokio::{
sync::Semaphore,
time::{sleep_until, Instant},
};
pub struct MusicBrainz {
client: Client,
rate_limit: Arc<Semaphore>,
}
#[derive(Debug, Deserialize, Encode, Decode)]
#[serde(rename_all = "kebab-case")]
pub struct MbRecording {
pub id: String,
pub first_release_date: String,
pub title: String,
pub isrcs: Vec<String>,
pub video: bool,
pub disambiguation: String,
pub length: u32,
pub relations: Vec<MbRelation>,
}
#[derive(Debug, Deserialize, Encode, Decode)]
#[serde(rename_all = "kebab-case")]
pub struct MbRelation {
direction: String,
r#type: String,
type_id: String,
begin: Option<String>,
end: Option<String>,
ended: bool,
target_type: String,
target_credit: String,
source_credit: String,
attributes: Vec<String>,
attribute_ids: BTreeMap<String, String>,
attribute_values: BTreeMap<String, String>,
work: Option<MbWork>,
artist: Option<MbArtist>,
url: Option<MbUrl>,
}
#[derive(Debug, Deserialize, Encode, Decode)]
#[serde(rename_all = "kebab-case")]
pub struct MbWork {
id: String,
r#type: String,
type_id: String,
languages: Vec<String>,
iswcs: Vec<String>,
language: Option<String>,
title: String,
attributes: Vec<String>,
disambiguation: String,
}
#[derive(Debug, Deserialize, Encode, Decode)]
#[serde(rename_all = "kebab-case")]
pub struct MbArtist {
id: String,
r#type: String,
type_id: String,
name: String,
disambiguation: String,
country: String,
sort_name: String,
}
#[derive(Debug, Deserialize, Encode, Decode)]
#[serde(rename_all = "kebab-case")]
pub struct MbUrl {
id: String,
resource: String,
}
impl MusicBrainz {
pub fn new() -> Self {
let client = ClientBuilder::new()
.default_headers(HeaderMap::from_iter([
(
HeaderName::from_static("accept"),
HeaderValue::from_static("application/json"),
),
(
HeaderName::from_static("user-agent"),
HeaderValue::from_static(USER_AGENT),
),
]))
.build()
.unwrap();
Self {
client,
// send at most 1 req/s according to musicbrainz docs, each lock is held for 10s
// this implementation also never sends more than 10 requests in-flight.
rate_limit: Arc::new(Semaphore::new(10)),
}
}
pub async fn lookup_recording(&self, id: String) -> Result<Arc<MbRecording>> {
async_cache_memory("api-musicbrainz-recording", id.clone(), || async move {
let _permit = self.rate_limit.clone().acquire_owned().await?;
let permit_drop_ts = Instant::now() + Duration::from_secs(10);
let inc = [
"isrcs",
"area-rels",
"artist-rels",
"event-rels",
"genre-rels",
"instrument-rels",
"label-rels",
"place-rels",
"recording-rels",
"release-rels",
"release-group-rels",
"series-rels",
"url-rels",
"work-rels",
]
.join("+");
let resp = self
.client
.get(format!(
"https://musicbrainz.org/ws/2/recording/{id}?inc={inc}"
))
.send()
.await?
.error_for_status()?
.json::<MbRecording>()
.await?;
tokio::task::spawn(async move {
sleep_until(permit_drop_ts).await;
drop(_permit);
});
Ok(resp)
})
.await
}
}
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