matrix-rust-sdk

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// Copyright 2025 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

//! Runtime abstractions for cross-platform async execution. This provides
//! a stand-in for tokio's `get_runtime_handle` method that will work on
//! both Wasm and non-Wasm platforms. It also provides corresponding types
//! that can be used in place of tokio's `Handle` and `Runtime` types.

#[cfg(not(target_family = "wasm"))]
mod sys {
    pub use tokio::runtime::Handle;

    /// Get a runtime handle appropriate for the current target platform.
    ///
    /// This function returns a unified `Handle` type that works across both
    /// Wasm and non-Wasm platforms, allowing code to be written that is
    /// agnostic to the platform-specific runtime implementation.
    ///
    /// Returns:
    /// - A `tokio::runtime::Handle` on non-Wasm platforms
    /// - A `WasmRuntimeHandle` on Wasm platforms
    pub fn get_runtime_handle() -> Handle {
        async_compat::get_runtime_handle()
    }
}

#[cfg(target_family = "wasm")]
mod sys {
    use std::future::Future;

    use matrix_sdk_common::executor::{JoinHandle, spawn};

    /// A dummy guard that does nothing when dropped.
    /// This is used for the Wasm implementation to match
    /// tokio::runtime::EnterGuard.
    #[derive(Debug)]
    pub struct RuntimeGuard;

    /// A runtime handle implementation for WebAssembly targets.
    ///
    /// This implements a minimal subset of the tokio::runtime::Handle API
    /// that is needed for the matrix-rust-sdk to function on Wasm.
    #[derive(Default, Debug)]
    pub struct Handle;
    pub type Runtime = Handle;

    impl Handle {
        /// Spawns a future in the wasm32 bindgen runtime.
        #[track_caller]
        pub fn spawn<F>(&self, future: F) -> JoinHandle<F::Output>
        where
            F: Future + 'static,
            F::Output: 'static,
        {
            spawn(future)
        }

        /// Runs the provided function on an executor dedicated to blocking
        /// operations.
        #[track_caller]
        pub fn spawn_blocking<F, R>(&self, func: F) -> JoinHandle<R>
        where
            F: FnOnce() -> R + 'static,
            R: 'static,
        {
            spawn(async move { func() })
        }

        /// Runs a future to completion on the current thread.
        pub fn block_on<F, T>(&self, future: F) -> T
        where
            F: Future<Output = T>,
        {
            futures_executor::block_on(future)
        }

        /// Enters the runtime context.
        ///
        /// For WebAssembly, this is a no-op that returns a dummy guard.
        pub fn enter(&self) -> RuntimeGuard {
            RuntimeGuard
        }
    }

    /// Get a runtime handle appropriate for the current target platform.
    ///
    /// This function returns a unified `Handle` type that works across both
    /// Wasm and non-Wasm platforms, allowing code to be written that is
    /// agnostic to the platform-specific runtime implementation.
    ///
    /// Returns:
    /// - A `tokio::runtime::Handle` on non-Wasm platforms
    /// - A `WasmRuntimeHandle` on Wasm platforms
    pub fn get_runtime_handle() -> Handle {
        Handle
    }
}

pub use sys::*;

1	// Copyright 2025 The Matrix.org Foundation C.I.C.
2	//
3	// Licensed under the Apache License, Version 2.0 (the "License");
4	// you may not use this file except in compliance with the License.
5	// You may obtain a copy of the License at
6	//
7	// http://www.apache.org/licenses/LICENSE-2.0
8	//
9	// Unless required by applicable law or agreed to in writing, software
10	// distributed under the License is distributed on an "AS IS" BASIS,
11	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12	// See the License for the specific language governing permissions and
13	// limitations under the License.
14
15	//! Runtime abstractions for cross-platform async execution. This provides
16	//! a stand-in for tokio's `get_runtime_handle` method that will work on
17	//! both Wasm and non-Wasm platforms. It also provides corresponding types
18	//! that can be used in place of tokio's `Handle` and `Runtime` types.
19
20	#[cfg(not(target_family = "wasm"))]
21	mod sys {
22	pub use tokio::runtime::Handle;
23
24	/// Get a runtime handle appropriate for the current target platform.
25	///
26	/// This function returns a unified `Handle` type that works across both
27	/// Wasm and non-Wasm platforms, allowing code to be written that is
28	/// agnostic to the platform-specific runtime implementation.
29	///
30	/// Returns:
31	/// - A `tokio::runtime::Handle` on non-Wasm platforms
32	/// - A `WasmRuntimeHandle` on Wasm platforms
33	pub fn get_runtime_handle() -> Handle {
34	async_compat::get_runtime_handle()
35	}
36	}
37
38	#[cfg(target_family = "wasm")]
39	mod sys {
40	use std::future::Future;
41
42	use matrix_sdk_common::executor::{JoinHandle, spawn};
43
44	/// A dummy guard that does nothing when dropped.
45	/// This is used for the Wasm implementation to match
46	/// tokio::runtime::EnterGuard.
47	#[derive(Debug)]
48	pub struct RuntimeGuard;
49
50	/// A runtime handle implementation for WebAssembly targets.
51	///
52	/// This implements a minimal subset of the tokio::runtime::Handle API
53	/// that is needed for the matrix-rust-sdk to function on Wasm.
54	#[derive(Default, Debug)]
55	pub struct Handle;
56	pub type Runtime = Handle;
57
58	impl Handle {
59	/// Spawns a future in the wasm32 bindgen runtime.
60	#[track_caller]
61	pub fn spawn<F>(&self, future: F) -> JoinHandle<F::Output>
62	where
63	F: Future + 'static,
64	F::Output: 'static,
65	{
66	spawn(future)
67	}
68
69	/// Runs the provided function on an executor dedicated to blocking
70	/// operations.
71	#[track_caller]
72	pub fn spawn_blocking<F, R>(&self, func: F) -> JoinHandle<R>
73	where
74	F: FnOnce() -> R + 'static,
75	R: 'static,
76	{
77	spawn(async move { func() })
78	}
79
80	/// Runs a future to completion on the current thread.
81	pub fn block_on<F, T>(&self, future: F) -> T
82	where
83	F: Future<Output = T>,
84	{
85	futures_executor::block_on(future)
86	}
87
88	/// Enters the runtime context.
89	///
90	/// For WebAssembly, this is a no-op that returns a dummy guard.
91	pub fn enter(&self) -> RuntimeGuard {
92	RuntimeGuard
93	}
94	}
95
96	/// Get a runtime handle appropriate for the current target platform.
97	///
98	/// This function returns a unified `Handle` type that works across both
99	/// Wasm and non-Wasm platforms, allowing code to be written that is
100	/// agnostic to the platform-specific runtime implementation.
101	///
102	/// Returns:
103	/// - A `tokio::runtime::Handle` on non-Wasm platforms
104	/// - A `WasmRuntimeHandle` on Wasm platforms
105	pub fn get_runtime_handle() -> Handle {
106	Handle
107	}
108	}
109
110	pub use sys::*;