build: replace futures dependency by futures-util

Author: Joseph Perez

Cargo.toml

@@ -32,7 +32,7 @@ unindent = { version = "0.2.1", optional = true }
 inventory = { version = "0.3.0", optional = true }
 
 # coroutine implementation
-futures= "0.3"
+futures-util = { version = "0.3", default-features = false, features = ["alloc"] }
 
 # crate integrations that can be added using the eponymous features
 anyhow = { version = "1.0", optional = true }
@@ -58,6 +58,7 @@ serde_json = "1.0.61"
 rayon = "1.0.2"
 rust_decimal = { version = "1.8.0", features = ["std"] }
 widestring = "0.5.1"
+futures = "0.3.29"
 
 [build-dependencies]
 pyo3-build-config = { path = "pyo3-build-config", version = "0.20.0", features = ["resolve-config"] }

src/coroutine.rs

@@ -102,7 +102,7 @@ impl Coroutine {
         } else {
             self.waker = Some(Arc::new(AsyncioWaker::new()));
         }
-        let waker = futures::task::waker(self.waker.clone().unwrap());
+        let waker = futures_util::task::waker(self.waker.clone().unwrap());
         // poll the Rust future and forward its results if ready
         if let Poll::Ready(res) = future_rs.as_mut().poll(&mut Context::from_waker(&waker)) {
             self.close();

src/coroutine/cancel.rs

@@ -1,6 +1,6 @@
 use crate::{ffi, Py, PyObject, Python};
-use futures::future::poll_fn;
-use futures::task::AtomicWaker;
+use futures_util::future::poll_fn;
+use futures_util::task::AtomicWaker;
 use std::ptr;
 use std::sync::atomic::{AtomicPtr, Ordering};
 use std::sync::Arc;

src/coroutine/waker.rs

@@ -1,7 +1,7 @@
 use crate::sync::GILOnceCell;
 use crate::types::PyCFunction;
 use crate::{intern, wrap_pyfunction, Py, PyAny, PyObject, PyResult, Python};
-use futures::task::ArcWake;
+use futures_util::task::ArcWake;
 use pyo3_macros::pyfunction;
 use std::sync::Arc;