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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::{Context, Result};
use bincode::{Decode, Encode};
use jellycache::async_cache_memory;
use log::info;
use reqwest::{
header::{HeaderMap, HeaderName, HeaderValue},
Client, ClientBuilder,
};
use serde::{Deserialize, Serialize};
use std::{path::Path, process::Stdio, sync::Arc, time::Duration};
use tokio::{
io::AsyncReadExt,
process::Command,
sync::Semaphore,
time::{sleep_until, Instant},
};
pub(crate) struct AcoustID {
client: Client,
key: String,
rate_limit: Arc<Semaphore>,
}
#[derive(Debug, Hash, Clone, Serialize, Deserialize)]
pub(crate) struct Fingerprint {
duration: u32,
fingerprint: String,
}
#[derive(Debug, Serialize, Deserialize)]
pub(crate) struct FpCalcOutput {
duration: f32,
fingerprint: String,
}
#[derive(Serialize, Deserialize, Encode, Decode)]
pub(crate) struct AcoustIDLookupResultRecording {
id: String,
}
#[derive(Serialize, Deserialize, Encode, Decode)]
pub(crate) struct AcoustIDLookupResult {
id: String,
score: f32,
#[serde(default)]
recordings: Vec<AcoustIDLookupResultRecording>,
}
#[derive(Serialize, Deserialize, Encode, Decode)]
pub(crate) struct AcoustIDLookupResponse {
status: String,
results: Vec<AcoustIDLookupResult>,
}
impl AcoustID {
pub fn new(api_key: &str) -> 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 3 req/s according to acoustid docs, each lock is therefore held for 1s
// this implementation also never sends more than 3 requests in-flight.
rate_limit: Arc::new(Semaphore::new(3)),
key: api_key.to_owned(),
}
}
pub async fn get_atid_mbid(&self, fp: &Fingerprint) -> Result<Option<(String, String)>> {
let res = self.lookup(fp.to_owned()).await?;
for r in &res.results {
if let Some(k) = r.recordings.get(0) {
return Ok(Some((r.id.clone(), k.id.clone())));
}
}
Ok(None)
}
pub async fn lookup(&self, fp: Fingerprint) -> Result<Arc<AcoustIDLookupResponse>> {
async_cache_memory("api-acoustid", fp.clone(), || async move {
let _permit = self.rate_limit.clone().acquire_owned().await?;
let permit_drop_ts = Instant::now() + Duration::SECOND;
info!("acoustid lookup");
let duration = fp.duration;
let fingerprint = fp.fingerprint.replace("=", "%3D");
let client = &self.key;
let body = format!("format=json&meta=recordingids&client={client}&duration={duration}&fingerprint={fingerprint}");
let resp = self
.client
.post(format!("https://api.acoustid.org/v2/lookup"))
.header("Content-Type", "application/x-www-form-urlencoded")
.body(body)
.send()
.await?.error_for_status()?.json::<AcoustIDLookupResponse>().await?;
tokio::task::spawn(async move {
sleep_until(permit_drop_ts).await;
drop(_permit);
});
Ok(resp)
})
.await.context("acoustid lookup")
}
}
#[allow(unused)]
pub(crate) async fn acoustid_fingerprint(path: &Path) -> Result<Arc<Fingerprint>> {
async_cache_memory("fpcalc", path, || async move {
let child = Command::new("fpcalc")
.arg("-json")
.arg(path)
.stdout(Stdio::piped())
.spawn()
.context("fpcalc")?;
let mut buf = Vec::new();
child
.stdout
.unwrap()
.read_to_end(&mut buf)
.await
.context("read fpcalc output")?;
let out: FpCalcOutput = serde_json::from_slice(&buf).context("parsing fpcalc output")?;
let out = Fingerprint {
duration: out.duration as u32,
fingerprint: out.fingerprint,
};
Ok(out)
})
.await
}
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