Downscope usage of futures

Cargo.lock

@@ -4306,6 +4306,7 @@ dependencies = [
 name = "monero-serai"
 version = "0.1.4-alpha"
 dependencies = [
+ "async-lock",
  "async-trait",
  "base58-monero",
  "curve25519-dalek",
@@ -4313,7 +4314,6 @@ dependencies = [
  "digest_auth",
  "dleq",
  "flexible-transcript",
- "futures",
  "group",
  "hex",
  "hex-literal",
@@ -7337,7 +7337,7 @@ dependencies = [
  "env_logger",
  "flexible-transcript",
  "frost-schnorrkel",
- "futures",
+ "futures-util",
  "hex",
  "libp2p",
  "log",
@@ -8981,7 +8981,8 @@ name = "tendermint-machine"
 version = "0.2.0"
 dependencies = [
  "async-trait",
- "futures",
+ "futures-channel",
+ "futures-util",
  "hex",
  "log",
  "parity-scale-codec",
@@ -9400,7 +9401,8 @@ dependencies = [
  "blake2",
  "ciphersuite",
  "flexible-transcript",
- "futures",
+ "futures-channel",
+ "futures-util",
  "hex",
  "log",
  "parity-scale-codec",

coins/monero/Cargo.toml

@@ -45,7 +45,7 @@ frost = { package = "modular-frost", path = "../../crypto/frost", version = "0.8
 
 monero-generators = { path = "generators", version = "0.4", default-features = false }
 
-futures = { version = "0.3", default-features = false, features = ["alloc"], optional = true }
+async-lock = { version = "3", default-features = false, optional = true }
 
 hex-literal = "0.4"
 hex = { version = "0.4", default-features = false, features = ["alloc"] }
@@ -92,7 +92,7 @@ std = [
 
   "monero-generators/std",
 
-  "futures?/std",
+  "async-lock?/std",
 
   "hex/std",
   "serde/std",
@@ -101,7 +101,7 @@ std = [
   "base58-monero/std",
 ]
 
-cache-distribution = ["futures"]
+cache-distribution = ["async-lock"]
 http-rpc = ["digest_auth", "simple-request", "tokio"]
 multisig = ["transcript", "frost", "dleq", "std"]
 binaries = ["tokio/rt-multi-thread", "tokio/macros", "http-rpc"]

coins/monero/src/wallet/decoys.rs

@@ -6,7 +6,7 @@ use std_shims::sync::OnceLock;
 #[cfg(all(feature = "cache-distribution", not(feature = "std")))]
 use std_shims::sync::Mutex;
 #[cfg(all(feature = "cache-distribution", feature = "std"))]
-use futures::lock::Mutex;
+use async_lock::Mutex;
 
 use zeroize::{Zeroize, ZeroizeOnDrop};
 

coordinator/Cargo.toml

@@ -46,12 +46,11 @@ borsh = { version = "1", default-features = false, features = ["std", "derive",
 log = { version = "0.4", default-features = false, features = ["std"] }
 env_logger = { version = "0.10", default-features = false, features = ["humantime"] }
 
-futures = { version = "0.3", default-features = false, features = ["std"] }
 tokio = { version = "1", default-features = false, features = ["rt-multi-thread", "sync", "time", "macros"] }
 libp2p = { version = "0.52", default-features = false, features = ["tokio", "tcp", "noise", "yamux", "gossipsub", "mdns", "macros"] }
 
 [dev-dependencies]
-futures = { version = "0.3", default-features = false, features = ["std"] }
+futures-util = { version = "0.3", default-features = false, features = ["std"] }
 tributary = { package = "tributary-chain", path = "./tributary", features = ["tests"] }
 sp-application-crypto = { git = "https://github.com/serai-dex/substrate", default-features = false, features = ["std"] }
 sp-runtime = { git = "https://github.com/serai-dex/substrate", default-features = false, features = ["std"] }

coordinator/src/tests/tributary/chain.rs

@@ -5,7 +5,7 @@ use std::{
 
 use zeroize::Zeroizing;
 use rand_core::{RngCore, CryptoRng, OsRng};
-use futures::{task::Poll, poll};
+use futures_util::{task::Poll, poll};
 
 use ciphersuite::{
   group::{ff::Field, GroupEncoding},

coordinator/tributary/Cargo.toml

@@ -29,7 +29,8 @@ log = { version = "0.4", default-features = false, features = ["std"] }
 serai-db = { path = "../../common/db" }
 
 scale = { package = "parity-scale-codec", version = "3", default-features = false, features = ["std", "derive"] }
-futures = { version = "0.3", default-features = false, features = ["std"] }
+futures-util = { version = "0.3", default-features = false, features = ["std", "sink", "channel"] }
+futures-channel = { version = "0.3", default-features = false, features = ["std", "sink"] }
 tendermint = { package = "tendermint-machine", path = "./tendermint" }
 
 tokio = { version = "1", default-features = false, features = ["sync", "time", "rt"] }

coordinator/tributary/src/lib.rs

@@ -8,7 +8,8 @@ use zeroize::Zeroizing;
 use ciphersuite::{Ciphersuite, Ristretto};
 
 use scale::Decode;
-use futures::{StreamExt, SinkExt, channel::mpsc::UnboundedReceiver};
+use futures_channel::mpsc::UnboundedReceiver;
+use futures_util::{StreamExt, SinkExt};
 use ::tendermint::{
   ext::{BlockNumber, Commit, Block as BlockTrait, Network},
   SignedMessageFor, SyncedBlock, SyncedBlockSender, SyncedBlockResultReceiver, MessageSender,

coordinator/tributary/tendermint/Cargo.toml

@@ -16,7 +16,8 @@ log = { version = "0.4", default-features = false, features = ["std"] }
 
 parity-scale-codec = { version = "3", default-features = false, features = ["std", "derive"] }
 
-futures = { version = "0.3", default-features = false, features = ["std", "async-await"] }
+futures-util = { version = "0.3", default-features = false, features = ["std", "async-await-macro", "sink", "channel"] }
+futures-channel = { version = "0.3", default-features = false, features = ["std", "sink"] }
 tokio = { version = "1", default-features = false, features = ["time"] }
 
 [dev-dependencies]

coordinator/tributary/tendermint/src/lib.rs

@@ -8,10 +8,10 @@ use std::{
 
 use parity_scale_codec::{Encode, Decode};
 
-use futures::{
+use futures_channel::mpsc;
+use futures_util::{
   FutureExt, StreamExt, SinkExt,
   future::{self, Fuse},
-  channel::mpsc,
 };
 use tokio::time::sleep;
 
@@ -367,7 +367,7 @@ impl<N: Network + 'static> TendermintMachine<N> {
       let mut queue_future =
         if self.queue.is_empty() { Fuse::terminated() } else { future::ready(()).fuse() };
 
-      if let Some((our_message, msg, mut sig)) = futures::select_biased! {
+      if let Some((our_message, msg, mut sig)) = futures_util::select_biased! {
         // Handle a new block occurring externally (an external sync loop)
         // Has the highest priority as it makes all other futures here irrelevant
         msg = self.synced_block_recv.next() => {

coordinator/tributary/tendermint/src/round.rs

@@ -4,7 +4,7 @@ use std::{
   collections::HashMap,
 };
 
-use futures::{FutureExt, future};
+use futures_util::{FutureExt, future};
 use tokio::time::sleep;
 
 use crate::{
@@ -80,9 +80,9 @@ impl<N: Network> RoundData<N> {
     let propose_timeout = timeout_future(Step::Propose);
     let prevote_timeout = timeout_future(Step::Prevote);
     let precommit_timeout = timeout_future(Step::Precommit);
-    futures::pin_mut!(propose_timeout, prevote_timeout, precommit_timeout);
+    futures_util::pin_mut!(propose_timeout, prevote_timeout, precommit_timeout);
 
-    futures::select_biased! {
+    futures_util::select_biased! {
       step = propose_timeout => step,
       step = prevote_timeout => step,
       step = precommit_timeout => step,

coordinator/tributary/tendermint/tests/ext.rs

@@ -7,7 +7,7 @@ use async_trait::async_trait;
 
 use parity_scale_codec::{Encode, Decode};
 
-use futures::SinkExt;
+use futures_util::sink::SinkExt;
 use tokio::{sync::RwLock, time::sleep};
 
 use tendermint_machine::{

tests/no-std/Cargo.toml

@@ -33,4 +33,4 @@ dkg = { path = "../../crypto/dkg", default-features = false }
 bitcoin-serai = { path = "../../coins/bitcoin", default-features = false, features = ["hazmat"] }
 
 monero-generators = { path = "../../coins/monero/generators", default-features = false }
-monero-serai = { path = "../../coins/monero", default-features = false }
+monero-serai = { path = "../../coins/monero", default-features = false, features = ["cache-distribution"] }