Clean up dependencies of librespot-core

* Use sub-crates of future
* Remove unnecessary pin-project
* Removed unused crates and features
* Replace futures channels by tokio channels
* Use serde's "derive" feature flag instead of serde_derive

Cargo.lock

@@ -1453,7 +1453,9 @@ dependencies = [
  "cfg-if 1.0.0",
  "env_logger",
  "error-chain",
- "futures",
+ "futures-core",
+ "futures-sink",
+ "futures-util",
  "hmac",
  "httparse",
  "hyper",
@@ -1464,15 +1466,14 @@ dependencies = [
  "num-traits",
  "once_cell",
  "pbkdf2",
- "pin-project-lite",
  "protobuf",
- "rand 0.7.3",
+ "rand 0.8.3",
  "serde",
- "serde_derive",
  "serde_json",
  "sha-1 0.9.4",
  "shannon",
  "tokio",
+ "tokio-stream",
  "tokio-util",
  "url 1.7.2",
  "vergen",
@@ -2819,6 +2820,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "tokio-stream"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1981ad97df782ab506a1f43bf82c967326960d278acf3bf8279809648c3ff3ea"
+dependencies = [
+ "futures-core",
+ "pin-project-lite",
+ "tokio",
+]
+
 [[package]]
 name = "tokio-util"
 version = "0.6.3"

core/Cargo.toml

@@ -19,7 +19,9 @@ byteorder = "1.4"
 bytes = "1.0"
 cfg-if = "1"
 error-chain = { version = "0.12", default-features = false }
-futures = { version = "0.3", features = ["bilock", "unstable"] }
+futures-core = { version = "0.3", default-features = false }
+futures-sink = { version = "0.3", default-features = false }
+futures-util = { version = "0.3", default-features = false, features = ["alloc", "bilock", "unstable", "sink"] }
 hmac = "0.10"
 httparse = "1.3"
 hyper = { version = "0.14", optional = true, features = ["client", "tcp", "http1"] }
@@ -28,21 +30,20 @@ num-bigint = "0.3"
 num-integer = "0.1"
 num-traits = "0.2"
 once_cell = "1.5.2"
-pbkdf2 = { version = "0.7", default_features = false, features = ["hmac"] }
+pbkdf2 = { version = "0.7", default-features = false, features = ["hmac"] }
-pin-project-lite = "0.2.4"
 protobuf = "~2.14.0"
-rand = "0.7"
+rand = "0.8"
-serde = "1.0"
+serde = { version = "1.0", features = ["derive"] }
-serde_derive = "1.0"
 serde_json = "1.0"
 sha-1 = "0.9"
 shannon = "0.2.0"
-tokio = { version = "1.0", features = ["io-util", "rt-multi-thread"] }
+tokio = { version = "1.0", features = ["io-util", "net", "rt", "sync"] }
+tokio-stream = "0.1"
 tokio-util = { version = "0.6", features = ["codec"] }
 url = "1.7"
 
 [build-dependencies]
-rand = "0.7"
+rand = "0.8"
 vergen = "3.0.4"
 
 [dev-dependencies]

core/build.rs

@@ -7,10 +7,10 @@ fn main() {
     flags.toggle(ConstantsFlags::REBUILD_ON_HEAD_CHANGE);
     generate_cargo_keys(ConstantsFlags::all()).expect("Unable to generate the cargo keys!");
 
-    let mut rng = rand::thread_rng();
+    let build_id: String = rand::thread_rng()
-    let build_id: String = ::std::iter::repeat(())
+        .sample_iter(Alphanumeric)
-        .map(|()| rng.sample(Alphanumeric))
         .take(8)
+        .map(char::from)
         .collect();
     println!("cargo:rustc-env=VERGEN_BUILD_ID={}", build_id);
 }

core/src/apresolve.rs

@@ -9,6 +9,7 @@ cfg_if! {
         use std::error::Error;
 
         use hyper::{Body, Client, Method, Request, Uri};
+        use serde::{Serialize, Deserialize};
 
         use crate::proxytunnel::ProxyTunnel;
 

core/src/audio_key.rs

@@ -1,8 +1,8 @@
 use byteorder::{BigEndian, ByteOrder, WriteBytesExt};
 use bytes::Bytes;
-use futures::channel::oneshot;
 use std::collections::HashMap;
 use std::io::Write;
+use tokio::sync::oneshot;
 
 use crate::spotify_id::{FileId, SpotifyId};
 use crate::util::SeqGenerator;

core/src/authentication.rs

@@ -1,10 +1,13 @@
+use std::io::{self, Read};
+use std::ops::FnOnce;
+
 use aes::Aes192;
 use byteorder::{BigEndian, ByteOrder};
 use hmac::Hmac;
 use pbkdf2::pbkdf2;
 use protobuf::ProtobufEnum;
+use serde::{Deserialize, Serialize};
 use sha1::{Digest, Sha1};
-use std::io::{self, Read};
 
 use crate::protocol::authentication::AuthenticationType;
 use crate::protocol::keyexchange::{APLoginFailed, ErrorCode};

core/src/channel.rs

@@ -1,12 +1,14 @@
+use std::collections::HashMap;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+use std::time::Instant;
+
 use byteorder::{BigEndian, ByteOrder};
 use bytes::Bytes;
-use futures::{channel::mpsc, lock::BiLock, Stream, StreamExt};
+use futures_core::Stream;
-use std::{
+use futures_util::lock::BiLock;
-    collections::HashMap,
+use futures_util::StreamExt;
-    pin::Pin,
+use tokio::sync::mpsc;
-    task::{Context, Poll},
-    time::Instant,
-};
 
 use crate::util::SeqGenerator;
 
@@ -46,7 +48,7 @@ enum ChannelState {
 
 impl ChannelManager {
     pub fn allocate(&self) -> (u16, Channel) {
-        let (tx, rx) = mpsc::unbounded();
+        let (tx, rx) = mpsc::unbounded_channel();
 
         let seq = self.lock(|inner| {
             let seq = inner.sequence.get();
@@ -85,7 +87,7 @@ impl ChannelManager {
             inner.download_measurement_bytes += data.len();
 
             if let Entry::Occupied(entry) = inner.channels.entry(id) {
-                let _ = entry.get().unbounded_send((cmd, data));
+                let _ = entry.get().send((cmd, data));
             }
         });
     }
@@ -105,7 +107,7 @@ impl ChannelManager {
 
 impl Channel {
     fn recv_packet(&mut self, cx: &mut Context<'_>) -> Poll<Result<Bytes, ChannelError>> {
-        let (cmd, packet) = match self.receiver.poll_next_unpin(cx) {
+        let (cmd, packet) = match self.receiver.poll_recv(cx) {
             Poll::Pending => return Poll::Pending,
             Poll::Ready(o) => o.ok_or(ChannelError)?,
         };

core/src/connection/mod.rs

@@ -4,7 +4,7 @@ mod handshake;
 pub use self::codec::APCodec;
 pub use self::handshake::handshake;
 
-use futures::{SinkExt, StreamExt};
+use futures_util::{SinkExt, StreamExt};
 use protobuf::{self, Message};
 use std::io;
 use std::net::ToSocketAddrs;

core/src/keymaster.rs

@@ -1,3 +1,5 @@
+use serde::Deserialize;
+
 use crate::{mercury::MercuryError, session::Session};
 
 #[derive(Deserialize, Debug, Clone)]

core/src/lib.rs

@@ -5,10 +5,6 @@ extern crate log;
 #[macro_use]
 extern crate cfg_if;
 #[macro_use]
-extern crate serde_derive;
-#[macro_use]
-extern crate pin_project_lite;
-#[macro_use]
 extern crate error_chain;
 
 use librespot_protocol as protocol;

core/src/mercury/mod.rs

@@ -1,14 +1,17 @@
+use std::collections::HashMap;
+use std::future::Future;
+use std::mem;
+use std::pin::Pin;
+use std::task::Context;
+use std::task::Poll;
+
+use byteorder::{BigEndian, ByteOrder};
+use bytes::Bytes;
+use tokio::sync::{mpsc, oneshot};
+
 use crate::protocol;
 use crate::util::url_encode;
 use crate::util::SeqGenerator;
-use byteorder::{BigEndian, ByteOrder};
-use bytes::Bytes;
-use futures::{
-    channel::{mpsc, oneshot},
-    Future,
-};
-use std::{collections::HashMap, task::Poll};
-use std::{mem, pin::Pin, task::Context};
 
 mod types;
 pub use self::types::*;
@@ -31,18 +34,15 @@ pub struct MercuryPending {
     callback: Option<oneshot::Sender<Result<MercuryResponse, MercuryError>>>,
 }
 
-pin_project! {
+pub struct MercuryFuture<T> {
-    pub struct MercuryFuture<T> {
+    receiver: oneshot::Receiver<Result<T, MercuryError>>,
-        #[pin]
-        receiver: oneshot::Receiver<Result<T, MercuryError>>
-    }
 }
 
 impl<T> Future for MercuryFuture<T> {
     type Output = Result<T, MercuryError>;
 
-    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
-        match self.project().receiver.poll(cx) {
+        match Pin::new(&mut self.receiver).poll(cx) {
             Poll::Ready(Ok(x)) => Poll::Ready(x),
             Poll::Ready(Err(_)) => Poll::Ready(Err(MercuryError)),
             Poll::Pending => Poll::Pending,
@@ -119,7 +119,7 @@ impl MercuryManager {
         async move {
             let response = request.await?;
 
-            let (tx, rx) = mpsc::unbounded();
+            let (tx, rx) = mpsc::unbounded_channel();
 
             manager.lock(move |inner| {
                 if !inner.invalid {
@@ -221,7 +221,7 @@ impl MercuryManager {
 
                             // if send fails, remove from list of subs
                             // TODO: send unsub message
-                            sub.unbounded_send(response.clone()).is_ok()
+                            sub.send(response.clone()).is_ok()
                         } else {
                             // URI doesn't match
                             true

core/src/session.rs

@@ -1,14 +1,19 @@
+use std::future::Future;
+use std::io;
+use std::pin::Pin;
 use std::sync::atomic::{AtomicUsize, Ordering};
 use std::sync::{Arc, RwLock, Weak};
+use std::task::Context;
 use std::task::Poll;
 use std::time::{SystemTime, UNIX_EPOCH};
-use std::{io, pin::Pin, task::Context};
-
-use once_cell::sync::OnceCell;
 
 use byteorder::{BigEndian, ByteOrder};
 use bytes::Bytes;
-use futures::{channel::mpsc, Future, FutureExt, StreamExt, TryStream, TryStreamExt};
+use futures_core::TryStream;
+use futures_util::{FutureExt, StreamExt, TryStreamExt};
+use once_cell::sync::OnceCell;
+use tokio::sync::mpsc;
+use tokio_stream::wrappers::UnboundedReceiverStream;
 
 use crate::apresolve::apresolve_or_fallback;
 use crate::audio_key::AudioKeyManager;
@@ -87,7 +92,7 @@ impl Session {
     ) -> Session {
         let (sink, stream) = transport.split();
 
-        let (sender_tx, sender_rx) = mpsc::unbounded();
+        let (sender_tx, sender_rx) = mpsc::unbounded_channel();
         let session_id = SESSION_COUNTER.fetch_add(1, Ordering::Relaxed);
 
         debug!("new Session[{}]", session_id);
@@ -114,11 +119,13 @@ impl Session {
             session_id: session_id,
         }));
 
-        let sender_task = sender_rx.map(Ok::<_, io::Error>).forward(sink);
+        let sender_task = UnboundedReceiverStream::new(sender_rx)
+            .map(Ok)
+            .forward(sink);
         let receiver_task = DispatchTask(stream, session.weak());
 
         let task =
-            futures::future::join(sender_task, receiver_task).map(|_| io::Result::<_>::Ok(()));
+            futures_util::future::join(sender_task, receiver_task).map(|_| io::Result::<_>::Ok(()));
         tokio::spawn(task);
         session
     }
@@ -193,7 +200,7 @@ impl Session {
     }
 
     pub fn send_packet(&self, cmd: u8, data: Vec<u8>) {
-        self.0.tx_connection.unbounded_send((cmd, data)).unwrap();
+        self.0.tx_connection.send((cmd, data)).unwrap();
     }
 
     pub fn cache(&self) -> Option<&Arc<Cache>> {