mirror of
https://github.com/librespot-org/librespot.git
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Introduce caching ApResolver component
This commit is contained in:
Roderick van Domburg
parent
b6357a27a5
commit
eee79f2a1e
2 changed files with 139 additions and 140 deletions
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@ -1,118 +1,124 @@
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use crate::http_client::HttpClient;
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use hyper::{Body, Request};
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use serde::Deserialize;
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use std::error::Error;
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const APRESOLVE_ENDPOINT: &str =
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"http://apresolve.spotify.com/?type=accesspoint&type=dealer&type=spclient";
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// These addresses probably do some geo-location based traffic management or at least DNS-based
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// load balancing. They are known to fail when the normal resolvers are up, so that's why they
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// should only be used as fallback.
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const AP_FALLBACK: &str = "ap.spotify.com";
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const DEALER_FALLBACK: &str = "dealer.spotify.com";
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const SPCLIENT_FALLBACK: &str = "spclient.wg.spotify.com";
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const FALLBACK_PORT: u16 = 443;
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pub type SocketAddress = (String, u16);
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#[derive(Clone, Debug, Default, Deserialize)]
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#[derive(Default)]
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struct AccessPoints {
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accesspoint: Vec<SocketAddress>,
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dealer: Vec<SocketAddress>,
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spclient: Vec<SocketAddress>,
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}
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#[derive(Deserialize)]
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struct ApResolveData {
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accesspoint: Vec<String>,
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dealer: Vec<String>,
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spclient: Vec<String>,
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}
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#[derive(Clone, Debug, Deserialize)]
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pub struct AccessPoints {
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pub accesspoint: SocketAddress,
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pub dealer: SocketAddress,
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pub spclient: SocketAddress,
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}
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fn select_ap(data: Vec<String>, fallback: &str, ap_port: Option<u16>) -> SocketAddress {
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let port = ap_port.unwrap_or(FALLBACK_PORT);
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let mut aps = data.into_iter().filter_map(|ap| {
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let mut split = ap.rsplitn(2, ':');
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let port = split
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.next()
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.expect("rsplitn should not return empty iterator");
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let host = split.next()?.to_owned();
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let port: u16 = port.parse().ok()?;
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Some((host, port))
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});
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let ap = if ap_port.is_some() {
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aps.find(|(_, p)| *p == port)
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} else {
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aps.next()
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};
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ap.unwrap_or_else(|| (String::from(fallback), port))
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}
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async fn try_apresolve(http_client: &HttpClient) -> Result<ApResolveData, Box<dyn Error>> {
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let req = Request::builder()
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.method("GET")
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.uri(APRESOLVE_ENDPOINT)
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.body(Body::empty())
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.unwrap();
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let body = http_client.request_body(req).await?;
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let data: ApResolveData = serde_json::from_slice(body.as_ref())?;
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Ok(data)
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}
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pub async fn apresolve(http_client: &HttpClient, ap_port: Option<u16>) -> AccessPoints {
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let data = try_apresolve(http_client).await.unwrap_or_else(|e| {
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warn!("Failed to resolve access points: {}, using fallbacks.", e);
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ApResolveData::default()
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});
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let accesspoint = select_ap(data.accesspoint, AP_FALLBACK, ap_port);
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let dealer = select_ap(data.dealer, DEALER_FALLBACK, ap_port);
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let spclient = select_ap(data.spclient, SPCLIENT_FALLBACK, ap_port);
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AccessPoints {
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accesspoint,
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dealer,
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spclient,
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// These addresses probably do some geo-location based traffic management or at least DNS-based
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// load balancing. They are known to fail when the normal resolvers are up, so that's why they
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// should only be used as fallback.
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impl Default for ApResolveData {
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fn default() -> Self {
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Self {
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accesspoint: vec![String::from("ap.spotify.com:443")],
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dealer: vec![String::from("dealer.spotify.com:443")],
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spclient: vec![String::from("spclient.wg.spotify.com:443")],
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}
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}
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}
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#[cfg(test)]
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mod test {
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use std::net::ToSocketAddrs;
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use super::apresolve;
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use crate::http_client::HttpClient;
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#[tokio::test]
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async fn test_apresolve() {
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let http_client = HttpClient::new(None);
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let aps = apresolve(&http_client, None).await;
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// Assert that the result contains a valid host and port
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aps.accesspoint.to_socket_addrs().unwrap().next().unwrap();
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aps.dealer.to_socket_addrs().unwrap().next().unwrap();
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aps.spclient.to_socket_addrs().unwrap().next().unwrap();
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}
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#[tokio::test]
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async fn test_apresolve_port_443() {
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let http_client = HttpClient::new(None);
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let aps = apresolve(&http_client, Some(443)).await;
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let port = aps
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.accesspoint
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.to_socket_addrs()
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.unwrap()
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.next()
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.unwrap()
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.port();
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assert_eq!(port, 443);
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component! {
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ApResolver : ApResolverInner {
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data: AccessPoints = AccessPoints::default(),
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}
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}
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impl ApResolver {
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fn split_aps(data: Vec<String>) -> Vec<SocketAddress> {
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data.into_iter()
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.filter_map(|ap| {
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let mut split = ap.rsplitn(2, ':');
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let port = split
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.next()
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.expect("rsplitn should not return empty iterator");
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let host = split.next()?.to_owned();
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let port: u16 = port.parse().ok()?;
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Some((host, port))
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})
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.collect()
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}
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fn find_ap(&self, data: &[SocketAddress]) -> usize {
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match self.session().config().proxy {
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Some(_) => data
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.iter()
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.position(|(_, port)| *port == self.session().config().ap_port.unwrap_or(443))
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.expect("No access points available with that proxy port."),
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None => 0, // just pick the first one
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}
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}
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async fn try_apresolve(&self) -> Result<ApResolveData, Box<dyn Error>> {
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let req = Request::builder()
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.method("GET")
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.uri("http://apresolve.spotify.com/?type=accesspoint&type=dealer&type=spclient")
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.body(Body::empty())
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.unwrap();
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let body = self.session().http_client().request_body(req).await?;
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let data: ApResolveData = serde_json::from_slice(body.as_ref())?;
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Ok(data)
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}
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async fn apresolve(&self) {
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let result = self.try_apresolve().await;
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self.lock(|inner| {
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let data = match result {
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Ok(data) => data,
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Err(e) => {
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warn!("Failed to resolve access points, using fallbacks: {}", e);
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ApResolveData::default()
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}
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};
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inner.data.accesspoint = Self::split_aps(data.accesspoint);
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inner.data.dealer = Self::split_aps(data.dealer);
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inner.data.spclient = Self::split_aps(data.spclient);
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})
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}
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fn is_empty(&self) -> bool {
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self.lock(|inner| {
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inner.data.accesspoint.is_empty()
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|| inner.data.dealer.is_empty()
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|| inner.data.spclient.is_empty()
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})
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}
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pub async fn resolve(&self, endpoint: &str) -> SocketAddress {
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if self.is_empty() {
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self.apresolve().await;
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}
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self.lock(|inner| match endpoint {
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"accesspoint" => {
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let pos = self.find_ap(&inner.data.accesspoint);
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inner.data.accesspoint.remove(pos)
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}
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"dealer" => {
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let pos = self.find_ap(&inner.data.dealer);
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inner.data.dealer.remove(pos)
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}
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"spclient" => {
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let pos = self.find_ap(&inner.data.spclient);
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inner.data.spclient.remove(pos)
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}
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_ => unimplemented!(),
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})
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}
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}
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@ -16,7 +16,7 @@ use thiserror::Error;
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use tokio::sync::mpsc;
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use tokio_stream::wrappers::UnboundedReceiverStream;
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use crate::apresolve::apresolve;
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use crate::apresolve::ApResolver;
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use crate::audio_key::AudioKeyManager;
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use crate::authentication::Credentials;
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use crate::cache::Cache;
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@ -49,6 +49,7 @@ struct SessionInternal {
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http_client: HttpClient,
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tx_connection: mpsc::UnboundedSender<(u8, Vec<u8>)>,
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apresolver: OnceCell<ApResolver>,
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audio_key: OnceCell<AudioKeyManager>,
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channel: OnceCell<ChannelManager>,
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mercury: OnceCell<MercuryManager>,
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@ -72,40 +73,6 @@ impl Session {
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cache: Option<Cache>,
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) -> Result<Session, SessionError> {
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let http_client = HttpClient::new(config.proxy.as_ref());
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let ap = apresolve(&http_client, config.ap_port).await.accesspoint;
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info!("Connecting to AP \"{}:{}\"", ap.0, ap.1);
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let mut transport = connection::connect(&ap.0, ap.1, config.proxy.as_ref()).await?;
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let reusable_credentials =
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connection::authenticate(&mut transport, credentials, &config.device_id).await?;
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info!("Authenticated as \"{}\" !", reusable_credentials.username);
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if let Some(cache) = &cache {
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cache.save_credentials(&reusable_credentials);
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}
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let session = Session::create(
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transport,
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http_client,
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config,
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cache,
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reusable_credentials.username,
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tokio::runtime::Handle::current(),
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);
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Ok(session)
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}
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fn create(
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transport: connection::Transport,
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http_client: HttpClient,
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config: SessionConfig,
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cache: Option<Cache>,
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username: String,
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handle: tokio::runtime::Handle,
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) -> Session {
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let (sink, stream) = transport.split();
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let (sender_tx, sender_rx) = mpsc::unbounded_channel();
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let session_id = SESSION_COUNTER.fetch_add(1, Ordering::Relaxed);
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@ -115,21 +82,37 @@ impl Session {
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config,
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data: RwLock::new(SessionData {
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country: String::new(),
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canonical_username: username,
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canonical_username: String::new(),
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invalid: false,
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time_delta: 0,
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}),
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http_client,
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tx_connection: sender_tx,
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cache: cache.map(Arc::new),
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apresolver: OnceCell::new(),
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audio_key: OnceCell::new(),
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channel: OnceCell::new(),
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mercury: OnceCell::new(),
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token_provider: OnceCell::new(),
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handle,
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handle: tokio::runtime::Handle::current(),
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session_id,
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}));
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let ap = session.apresolver().resolve("accesspoint").await;
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info!("Connecting to AP \"{}:{}\"", ap.0, ap.1);
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let mut transport =
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connection::connect(&ap.0, ap.1, session.config().proxy.as_ref()).await?;
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let reusable_credentials =
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connection::authenticate(&mut transport, credentials, &session.config().device_id)
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.await?;
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info!("Authenticated as \"{}\" !", reusable_credentials.username);
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session.0.data.write().unwrap().canonical_username = reusable_credentials.username.clone();
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if let Some(cache) = session.cache() {
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cache.save_credentials(&reusable_credentials);
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}
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let (sink, stream) = transport.split();
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let sender_task = UnboundedReceiverStream::new(sender_rx)
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.map(Ok)
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.forward(sink);
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@ -143,7 +126,13 @@ impl Session {
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}
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});
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session
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Ok(session)
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}
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pub fn apresolver(&self) -> &ApResolver {
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self.0
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.apresolver
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.get_or_init(|| ApResolver::new(self.weak()))
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}
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pub fn audio_key(&self) -> &AudioKeyManager {
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@ -158,6 +147,10 @@ impl Session {
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.get_or_init(|| ChannelManager::new(self.weak()))
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}
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pub fn http_client(&self) -> &HttpClient {
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&self.0.http_client
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}
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pub fn mercury(&self) -> &MercuryManager {
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self.0
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.mercury
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@ -230,7 +223,7 @@ impl Session {
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self.0.cache.as_ref()
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}
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fn config(&self) -> &SessionConfig {
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pub fn config(&self) -> &SessionConfig {
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&self.0.config
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}
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