rust/daemon/src/ffi.rs - platform/tools/netsim - Git at Google

 // Copyright 2023 Google LLC
 //
 // 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
 //
 //     https://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.

 //! Netsim daemon cxx libraries.

 use std::pin::Pin;

 use crate::bluetooth::chip::{
     create_add_rust_device_result, AddRustDeviceResult, RustBluetoothChipCallbacks,
 };
 use crate::http_server::server_response::ServerResponseWritable;
 use crate::http_server::server_response::StrHeaders;
 use cxx::let_cxx_string;

 use crate::transport::dispatcher::{handle_request_cxx, handle_response};
 use crate::transport::grpc::{register_grpc_transport, unregister_grpc_transport};

 use crate::captures::captures_handler::handle_capture_cxx;
 use crate::devices::devices_handler::{
     add_chip_cxx, get_distance_cxx, handle_device_cxx, remove_chip_cxx, AddChipResultCxx,
 };
 use crate::ranging::*;
 use crate::version::*;

 #[allow(unsafe_op_in_unsafe_fn)]
 #[cxx::bridge(namespace = "netsim::transport")]
 pub mod ffi_transport {
     extern "Rust" {
         #[cxx_name = HandleRequestCxx]
         fn handle_request_cxx(kind: u32, facade_id: u32, packet: &CxxVector<u8>, packet_type: u8);

         #[cxx_name = HandleResponse]
         fn handle_response(kind: u32, facade_id: u32, packet: &CxxVector<u8>, packet_type: u8);

         #[cxx_name = RegisterGrpcTransport]
         fn register_grpc_transport(kind: u32, facade_id: u32);

         #[cxx_name = UnregisterGrpcTransport]
         fn unregister_grpc_transport(kind: u32, facade_id: u32);
     }

     unsafe extern "C++" {
         // Grpc server.
         include!("backend/backend_packet_hub.h");

         #[rust_name = handle_grpc_response]
         #[namespace = "netsim::backend"]
         fn HandleResponseCxx(kind: u32, facade_id: u32, packet: &Vec<u8>, packet_type: u8);

         include!("core/server.h");

         #[namespace = "netsim::server"]
         type GrpcServer;
         #[rust_name = shut_down]
         #[namespace = "netsim::server"]
         fn Shutdown(self: &GrpcServer);

         #[rust_name = get_grpc_port]
         #[namespace = "netsim::server"]
         fn GetGrpcPort(self: &GrpcServer) -> u32;

         #[rust_name = run_grpc_server_cxx]
         #[namespace = "netsim::server"]
         pub fn RunGrpcServerCxx(
             netsim_grpc_port: u32,
             no_cli_ui: bool,
             instance_num: u16,
             vsock: u16,
         ) -> UniquePtr<GrpcServer>;

         // Grpc client.
         // Expose functions in Cuttlefish only, because it's only used by CVDs and it's
         // unable to pass function pointers on Windows.
         #[cfg(feature = "cuttlefish")]
         include!("backend/grpc_client.h");

         #[allow(dead_code)]
         #[rust_name = stream_packets]
         #[namespace = "netsim::backend::client"]
         #[cfg(feature = "cuttlefish")]
         fn StreamPackets(server: &String) -> u32;

         #[allow(dead_code)]
         #[rust_name = read_packet_response_loop]
         #[namespace = "netsim::backend::client"]
         #[cfg(feature = "cuttlefish")]
         fn ReadPacketResponseLoop(
             stream_id: u32,
             read_fn: fn(stream_id: u32, proto_bytes: &[u8]),
         ) -> bool;

         #[allow(dead_code)]
         #[rust_name = write_packet_request]
         #[cfg(feature = "cuttlefish")]
         #[namespace = "netsim::backend::client"]
         fn WritePacketRequest(stream_id: u32, proto_bytes: &[u8]) -> bool;

     }
 }

 #[allow(unsafe_op_in_unsafe_fn)]
 #[cxx::bridge(namespace = "netsim")]
 pub mod ffi_bluetooth {
     extern "Rust" {
         // Rust Bluetooth device.
         #[namespace = "netsim::hci::facade"]
         type DynRustBluetoothChipCallbacks;

         #[cxx_name = Tick]
         #[namespace = "netsim::hci::facade"]
         fn tick(dyn_callbacks: &mut DynRustBluetoothChipCallbacks);

         #[cxx_name = ReceiveLinkLayerPacket]
         #[namespace = "netsim::hci::facade"]
         fn receive_link_layer_packet(
             dyn_callbacks: &mut DynRustBluetoothChipCallbacks,
             source_address: String,
             destination_address: String,
             packet_type: u8,
             packet: &[u8],
         );

         // Bluetooth facade.
         #[namespace = "netsim::hci::facade"]
         type AddRustDeviceResult;
         #[cxx_name = "CreateAddRustDeviceResult"]
         #[namespace = "netsim::hci"]
         fn create_add_rust_device_result(
             facade_id: u32,
             rust_chip: UniquePtr<RustBluetoothChip>,
         ) -> Box<AddRustDeviceResult>;
     }

     #[allow(dead_code)]
     unsafe extern "C++" {
         // Bluetooth facade.
         include!("hci/hci_packet_hub.h");

         #[rust_name = handle_bt_request]
         #[namespace = "netsim::hci"]
         fn HandleBtRequestCxx(facade_id: u32, packet_type: u8, packet: &Vec<u8>);

         // Rust Bluetooth device.
         include!("hci/rust_device.h");

         #[namespace = "netsim::hci::facade"]
         type RustBluetoothChip;
         #[rust_name = send_link_layer_le_packet]
         #[namespace = "netsim::hci::facade"]
         fn SendLinkLayerLePacket(self: &RustBluetoothChip, packet: &[u8], tx_power: i8);

         include!("hci/bluetooth_facade.h");

         #[rust_name = bluetooth_patch_cxx]
         #[namespace = "netsim::hci::facade"]
         pub fn PatchCxx(facade_id: u32, proto_bytes: &[u8]);

         #[rust_name = bluetooth_get_cxx]
         #[namespace = "netsim::hci::facade"]
         pub fn GetCxx(facade_id: u32) -> Vec<u8>;

         #[rust_name = bluetooth_reset]
         #[namespace = "netsim::hci::facade"]
         pub fn Reset(facade_id: u32);

         #[rust_name = bluetooth_remove]
         #[namespace = "netsim::hci::facade"]
         pub fn Remove(facade_id: u32);

         #[rust_name = bluetooth_add]
         #[namespace = "netsim::hci::facade"]
         pub fn Add(_chip_id: u32, address: &CxxString, controller_proto_bytes: &[u8]) -> u32;

         /*
         From https://cxx.rs/binding/box.html#restrictions,
         ```
         If T is an opaque Rust type, the Rust type is required to be Sized i.e. size known at compile time. In the future we may introduce support for dynamically sized opaque Rust types.
         ```

         The workaround is using Box<dyn MyData> (fat pointer) as the opaque type.
         Reference:
         - Passing trait objects to C++. https://github.com/dtolnay/cxx/issues/665.
         - Exposing trait methods to C++. https://github.com/dtolnay/cxx/issues/667
                 */
         #[rust_name = bluetooth_add_rust_device]
         #[namespace = "netsim::hci::facade"]
         pub fn AddRustDevice(
             device_id: u32,
             callbacks: Box<DynRustBluetoothChipCallbacks>,
             string_type: &CxxString,
             address: &CxxString,
         ) -> Box<AddRustDeviceResult>;

         /// The provided address must be 6 bytes in length
         #[rust_name = bluetooth_set_rust_device_address]
         #[namespace = "netsim::hci::facade"]
         pub fn SetRustDeviceAddress(facade_id: u32, address: [u8; 6]);

         #[rust_name = bluetooth_remove_rust_device]
         #[namespace = "netsim::hci::facade"]
         pub fn RemoveRustDevice(facade_id: u32);

         #[rust_name = bluetooth_start]
         #[namespace = "netsim::hci::facade"]
         pub fn Start(proto_bytes: &[u8], instance_num: u16, disable_address_reuse: bool);

         #[rust_name = bluetooth_stop]
         #[namespace = "netsim::hci::facade"]
         pub fn Stop();
     }
 }

 #[cxx::bridge(namespace = "netsim::wifi::facade")]
 pub mod ffi_wifi {
     #[allow(dead_code)]
     unsafe extern "C++" {
         // WiFi facade.
         include!("wifi/wifi_packet_hub.h");

         #[rust_name = handle_wifi_request]
         #[namespace = "netsim::wifi"]
         fn HandleWifiRequestCxx(facade_id: u32, packet: &Vec<u8>);

         include!("wifi/wifi_facade.h");

         #[rust_name = wifi_patch_cxx]
         pub fn PatchCxx(facade_id: u32, proto_bytes: &[u8]);

         #[rust_name = wifi_get_cxx]
         pub fn GetCxx(facade_id: u32) -> Vec<u8>;

         #[rust_name = wifi_reset]
         pub fn Reset(facade_id: u32);

         #[rust_name = wifi_remove]
         pub fn Remove(facade_id: u32);

         #[rust_name = wifi_add]
         pub fn Add(_chip_id: u32) -> u32;

         #[rust_name = wifi_start]
         pub fn Start(proto_bytes: &[u8]);

         #[rust_name = wifi_stop]
         pub fn Stop();

     }
 }

 #[allow(unsafe_op_in_unsafe_fn)]
 #[cxx::bridge(namespace = "netsim::device")]
 pub mod ffi_devices {
     extern "Rust" {

         // Device Resource
         type AddChipResultCxx;
         #[cxx_name = "GetDeviceId"]
         fn get_device_id(self: &AddChipResultCxx) -> u32;
         #[cxx_name = "GetChipId"]
         fn get_chip_id(self: &AddChipResultCxx) -> u32;
         #[cxx_name = "GetFacadeId"]
         fn get_facade_id(self: &AddChipResultCxx) -> u32;
         #[cxx_name = "IsError"]
         fn is_error(self: &AddChipResultCxx) -> bool;

         #[allow(clippy::too_many_arguments)]
         #[cxx_name = AddChipCxx]
         fn add_chip_cxx(
             device_guid: &str,
             device_name: &str,
             chip_kind: &CxxString,
             chip_address: &str,
             chip_name: &str,
             chip_manufacturer: &str,
             chip_product_name: &str,
             bt_properties: &CxxVector<u8>,
         ) -> Box<AddChipResultCxx>;

         #[cxx_name = RemoveChipCxx]
         fn remove_chip_cxx(device_id: u32, chip_id: u32);

         #[cxx_name = GetDistanceCxx]
         fn get_distance_cxx(a: u32, b: u32) -> f32;
     }
 }

 #[allow(unsafe_op_in_unsafe_fn)]
 #[cxx::bridge(namespace = "netsim")]
 pub mod ffi_response_writable {
     extern "Rust" {
         // handlers for gRPC server's invocation of API calls

         #[cxx_name = "HandleCaptureCxx"]
         fn handle_capture_cxx(
             responder: Pin<&mut CxxServerResponseWriter>,
             method: String,
             param: String,
             body: String,
         );

         #[cxx_name = "HandleDeviceCxx"]
         fn handle_device_cxx(
             responder: Pin<&mut CxxServerResponseWriter>,
             method: String,
             param: String,
             body: String,
         );
     }
     unsafe extern "C++" {
         /// A C++ class which can be used to respond to a request.
         include!("frontend/server_response_writable.h");

         #[namespace = "netsim::frontend"]
         type CxxServerResponseWriter;

         #[namespace = "netsim::frontend"]
         fn put_ok_with_length(self: &CxxServerResponseWriter, mime_type: &CxxString, length: usize);

         #[namespace = "netsim::frontend"]
         fn put_chunk(self: &CxxServerResponseWriter, chunk: &[u8]);

         #[namespace = "netsim::frontend"]
         fn put_ok(self: &CxxServerResponseWriter, mime_type: &CxxString, body: &CxxString);

         #[namespace = "netsim::frontend"]
         fn put_error(self: &CxxServerResponseWriter, error_code: u32, error_message: &CxxString);

     }
 }

 #[allow(unsafe_op_in_unsafe_fn)]
 #[cxx::bridge(namespace = "netsim")]
 pub mod ffi_util {
     extern "Rust" {
         // Ranging

         #[cxx_name = "DistanceToRssi"]
         fn distance_to_rssi(tx_power: i8, distance: f32) -> i8;

         // Version

         #[cxx_name = "GetVersion"]
         fn get_version() -> String;
     }

     #[allow(dead_code)]
     unsafe extern "C++" {

         // OS utilities.
         include!("util/os_utils.h");

         #[rust_name = redirect_std_stream]
         #[namespace = "netsim::osutils"]
         #[cfg(not(feature = "cuttlefish"))]
         pub fn RedirectStdStream(netsim_temp_dir: &CxxString);

         // Crash report.
         include!("util/crash_report.h");

         #[rust_name = set_up_crash_report]
         #[namespace = "netsim"]
         pub fn SetUpCrashReport();

         // Frontend client.
         include!("frontend/frontend_client_stub.h");

         #[rust_name = is_netsimd_alive]
         #[namespace = "netsim::frontend"]
         pub fn IsNetsimdAlive(instance_num: u16) -> bool;

     }
 }

 // It's required so `RustBluetoothChip` can be sent between threads safely.
 // Ref: How to use opaque types in threads? https://github.com/dtolnay/cxx/issues/1175
 // SAFETY: Nothing in `RustBluetoothChip` depends on being run on a particular thread.
 unsafe impl Send for ffi_bluetooth::RustBluetoothChip {}

 type DynRustBluetoothChipCallbacks = Box<dyn RustBluetoothChipCallbacks>;

 fn tick(dyn_callbacks: &mut DynRustBluetoothChipCallbacks) {
     (**dyn_callbacks).tick();
 }

 fn receive_link_layer_packet(
     dyn_callbacks: &mut DynRustBluetoothChipCallbacks,
     source_address: String,
     destination_address: String,
     packet_type: u8,
     packet: &[u8],
 ) {
     (**dyn_callbacks).receive_link_layer_packet(
         source_address,
         destination_address,
         packet_type,
         packet,
     );
 }

 /// CxxServerResponseWriter is defined in server_response_writable.h
 /// Wrapper struct allows the impl to discover the respective C++ methods
 pub struct CxxServerResponseWriterWrapper<'a> {
     pub writer: Pin<&'a mut ffi_response_writable::CxxServerResponseWriter>,
 }

 impl ServerResponseWritable for CxxServerResponseWriterWrapper<'_> {
     fn put_ok_with_length(&mut self, mime_type: &str, length: usize, _headers: StrHeaders) {
         let_cxx_string!(mime_type = mime_type);
         self.writer.put_ok_with_length(&mime_type, length);
     }
     fn put_chunk(&mut self, chunk: &[u8]) {
         self.writer.put_chunk(chunk);
     }
     fn put_ok(&mut self, mime_type: &str, body: &str, _headers: StrHeaders) {
         let_cxx_string!(mime_type = mime_type);
         let_cxx_string!(body = body);
         self.writer.put_ok(&mime_type, &body);
     }
     fn put_error(&mut self, error_code: u16, error_message: &str) {
         let_cxx_string!(error_message = error_message);
         self.writer.put_error(error_code.into(), &error_message);
     }

     fn put_ok_with_vec(&mut self, _mime_type: &str, _body: Vec<u8>, _headers: StrHeaders) {
         todo!()
     }
     fn put_ok_switch_protocol(&mut self, _connection: &str, _headers: StrHeaders) {
         todo!()
     }
 }
	// Copyright 2023 Google LLC
	//
	// 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
	//
	// https://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.

	//! Netsim daemon cxx libraries.

	use std::pin::Pin;

	use crate::bluetooth::chip::{
	create_add_rust_device_result, AddRustDeviceResult, RustBluetoothChipCallbacks,
	};
	use crate::http_server::server_response::ServerResponseWritable;
	use crate::http_server::server_response::StrHeaders;
	use cxx::let_cxx_string;

	use crate::transport::dispatcher::{handle_request_cxx, handle_response};
	use crate::transport::grpc::{register_grpc_transport, unregister_grpc_transport};

	use crate::captures::captures_handler::handle_capture_cxx;
	use crate::devices::devices_handler::{
	add_chip_cxx, get_distance_cxx, handle_device_cxx, remove_chip_cxx, AddChipResultCxx,
	};
	use crate::ranging::*;
	use crate::version::*;

	#[allow(unsafe_op_in_unsafe_fn)]
	#[cxx::bridge(namespace = "netsim::transport")]
	pub mod ffi_transport {
	extern "Rust" {
	#[cxx_name = HandleRequestCxx]
	fn handle_request_cxx(kind: u32, facade_id: u32, packet: &CxxVector<u8>, packet_type: u8);

	#[cxx_name = HandleResponse]
	fn handle_response(kind: u32, facade_id: u32, packet: &CxxVector<u8>, packet_type: u8);

	#[cxx_name = RegisterGrpcTransport]
	fn register_grpc_transport(kind: u32, facade_id: u32);

	#[cxx_name = UnregisterGrpcTransport]
	fn unregister_grpc_transport(kind: u32, facade_id: u32);
	}

	unsafe extern "C++" {
	// Grpc server.
	include!("backend/backend_packet_hub.h");

	#[rust_name = handle_grpc_response]
	#[namespace = "netsim::backend"]
	fn HandleResponseCxx(kind: u32, facade_id: u32, packet: &Vec<u8>, packet_type: u8);

	include!("core/server.h");

	#[namespace = "netsim::server"]
	type GrpcServer;
	#[rust_name = shut_down]
	#[namespace = "netsim::server"]
	fn Shutdown(self: &GrpcServer);

	#[rust_name = get_grpc_port]
	#[namespace = "netsim::server"]
	fn GetGrpcPort(self: &GrpcServer) -> u32;

	#[rust_name = run_grpc_server_cxx]
	#[namespace = "netsim::server"]
	pub fn RunGrpcServerCxx(
	netsim_grpc_port: u32,
	no_cli_ui: bool,
	instance_num: u16,
	vsock: u16,
	) -> UniquePtr<GrpcServer>;

	// Grpc client.
	// Expose functions in Cuttlefish only, because it's only used by CVDs and it's
	// unable to pass function pointers on Windows.
	#[cfg(feature = "cuttlefish")]
	include!("backend/grpc_client.h");

	#[allow(dead_code)]
	#[rust_name = stream_packets]
	#[namespace = "netsim::backend::client"]
	#[cfg(feature = "cuttlefish")]
	fn StreamPackets(server: &String) -> u32;

	#[allow(dead_code)]
	#[rust_name = read_packet_response_loop]
	#[namespace = "netsim::backend::client"]
	#[cfg(feature = "cuttlefish")]
	fn ReadPacketResponseLoop(
	stream_id: u32,
	read_fn: fn(stream_id: u32, proto_bytes: &[u8]),
	) -> bool;

	#[allow(dead_code)]
	#[rust_name = write_packet_request]
	#[cfg(feature = "cuttlefish")]
	#[namespace = "netsim::backend::client"]
	fn WritePacketRequest(stream_id: u32, proto_bytes: &[u8]) -> bool;

	}
	}

	#[allow(unsafe_op_in_unsafe_fn)]
	#[cxx::bridge(namespace = "netsim")]
	pub mod ffi_bluetooth {
	extern "Rust" {
	// Rust Bluetooth device.
	#[namespace = "netsim::hci::facade"]
	type DynRustBluetoothChipCallbacks;

	#[cxx_name = Tick]
	#[namespace = "netsim::hci::facade"]
	fn tick(dyn_callbacks: &mut DynRustBluetoothChipCallbacks);

	#[cxx_name = ReceiveLinkLayerPacket]
	#[namespace = "netsim::hci::facade"]
	fn receive_link_layer_packet(
	dyn_callbacks: &mut DynRustBluetoothChipCallbacks,
	source_address: String,
	destination_address: String,
	packet_type: u8,
	packet: &[u8],
	);

	// Bluetooth facade.
	#[namespace = "netsim::hci::facade"]
	type AddRustDeviceResult;
	#[cxx_name = "CreateAddRustDeviceResult"]
	#[namespace = "netsim::hci"]
	fn create_add_rust_device_result(
	facade_id: u32,
	rust_chip: UniquePtr<RustBluetoothChip>,
	) -> Box<AddRustDeviceResult>;
	}

	#[allow(dead_code)]
	unsafe extern "C++" {
	// Bluetooth facade.
	include!("hci/hci_packet_hub.h");

	#[rust_name = handle_bt_request]
	#[namespace = "netsim::hci"]
	fn HandleBtRequestCxx(facade_id: u32, packet_type: u8, packet: &Vec<u8>);

	// Rust Bluetooth device.
	include!("hci/rust_device.h");

	#[namespace = "netsim::hci::facade"]
	type RustBluetoothChip;
	#[rust_name = send_link_layer_le_packet]
	#[namespace = "netsim::hci::facade"]
	fn SendLinkLayerLePacket(self: &RustBluetoothChip, packet: &[u8], tx_power: i8);

	include!("hci/bluetooth_facade.h");

	#[rust_name = bluetooth_patch_cxx]
	#[namespace = "netsim::hci::facade"]
	pub fn PatchCxx(facade_id: u32, proto_bytes: &[u8]);

	#[rust_name = bluetooth_get_cxx]
	#[namespace = "netsim::hci::facade"]
	pub fn GetCxx(facade_id: u32) -> Vec<u8>;

	#[rust_name = bluetooth_reset]
	#[namespace = "netsim::hci::facade"]
	pub fn Reset(facade_id: u32);

	#[rust_name = bluetooth_remove]
	#[namespace = "netsim::hci::facade"]
	pub fn Remove(facade_id: u32);

	#[rust_name = bluetooth_add]
	#[namespace = "netsim::hci::facade"]
	pub fn Add(_chip_id: u32, address: &CxxString, controller_proto_bytes: &[u8]) -> u32;

	/*
	From https://cxx.rs/binding/box.html#restrictions,
	```
	If T is an opaque Rust type, the Rust type is required to be Sized i.e. size known at compile time. In the future we may introduce support for dynamically sized opaque Rust types.
	```

	The workaround is using Box<dyn MyData> (fat pointer) as the opaque type.
	Reference:
	- Passing trait objects to C++. https://github.com/dtolnay/cxx/issues/665.
	- Exposing trait methods to C++. https://github.com/dtolnay/cxx/issues/667
	*/
	#[rust_name = bluetooth_add_rust_device]
	#[namespace = "netsim::hci::facade"]
	pub fn AddRustDevice(
	device_id: u32,
	callbacks: Box<DynRustBluetoothChipCallbacks>,
	string_type: &CxxString,
	address: &CxxString,
	) -> Box<AddRustDeviceResult>;

	/// The provided address must be 6 bytes in length
	#[rust_name = bluetooth_set_rust_device_address]
	#[namespace = "netsim::hci::facade"]
	pub fn SetRustDeviceAddress(facade_id: u32, address: [u8; 6]);

	#[rust_name = bluetooth_remove_rust_device]
	#[namespace = "netsim::hci::facade"]
	pub fn RemoveRustDevice(facade_id: u32);

	#[rust_name = bluetooth_start]
	#[namespace = "netsim::hci::facade"]
	pub fn Start(proto_bytes: &[u8], instance_num: u16, disable_address_reuse: bool);

	#[rust_name = bluetooth_stop]
	#[namespace = "netsim::hci::facade"]
	pub fn Stop();
	}
	}

	#[cxx::bridge(namespace = "netsim::wifi::facade")]
	pub mod ffi_wifi {
	#[allow(dead_code)]
	unsafe extern "C++" {
	// WiFi facade.
	include!("wifi/wifi_packet_hub.h");

	#[rust_name = handle_wifi_request]
	#[namespace = "netsim::wifi"]
	fn HandleWifiRequestCxx(facade_id: u32, packet: &Vec<u8>);

	include!("wifi/wifi_facade.h");

	#[rust_name = wifi_patch_cxx]
	pub fn PatchCxx(facade_id: u32, proto_bytes: &[u8]);

	#[rust_name = wifi_get_cxx]
	pub fn GetCxx(facade_id: u32) -> Vec<u8>;

	#[rust_name = wifi_reset]
	pub fn Reset(facade_id: u32);

	#[rust_name = wifi_remove]
	pub fn Remove(facade_id: u32);

	#[rust_name = wifi_add]
	pub fn Add(_chip_id: u32) -> u32;

	#[rust_name = wifi_start]
	pub fn Start(proto_bytes: &[u8]);

	#[rust_name = wifi_stop]
	pub fn Stop();

	}
	}

	#[allow(unsafe_op_in_unsafe_fn)]
	#[cxx::bridge(namespace = "netsim::device")]
	pub mod ffi_devices {
	extern "Rust" {

	// Device Resource
	type AddChipResultCxx;
	#[cxx_name = "GetDeviceId"]
	fn get_device_id(self: &AddChipResultCxx) -> u32;
	#[cxx_name = "GetChipId"]
	fn get_chip_id(self: &AddChipResultCxx) -> u32;
	#[cxx_name = "GetFacadeId"]
	fn get_facade_id(self: &AddChipResultCxx) -> u32;
	#[cxx_name = "IsError"]
	fn is_error(self: &AddChipResultCxx) -> bool;

	#[allow(clippy::too_many_arguments)]
	#[cxx_name = AddChipCxx]
	fn add_chip_cxx(
	device_guid: &str,
	device_name: &str,
	chip_kind: &CxxString,
	chip_address: &str,
	chip_name: &str,
	chip_manufacturer: &str,
	chip_product_name: &str,
	bt_properties: &CxxVector<u8>,
	) -> Box<AddChipResultCxx>;

	#[cxx_name = RemoveChipCxx]
	fn remove_chip_cxx(device_id: u32, chip_id: u32);

	#[cxx_name = GetDistanceCxx]
	fn get_distance_cxx(a: u32, b: u32) -> f32;
	}
	}

	#[allow(unsafe_op_in_unsafe_fn)]
	#[cxx::bridge(namespace = "netsim")]
	pub mod ffi_response_writable {
	extern "Rust" {
	// handlers for gRPC server's invocation of API calls

	#[cxx_name = "HandleCaptureCxx"]
	fn handle_capture_cxx(
	responder: Pin<&mut CxxServerResponseWriter>,
	method: String,
	param: String,
	body: String,
	);

	#[cxx_name = "HandleDeviceCxx"]
	fn handle_device_cxx(
	responder: Pin<&mut CxxServerResponseWriter>,
	method: String,
	param: String,
	body: String,
	);
	}
	unsafe extern "C++" {
	/// A C++ class which can be used to respond to a request.
	include!("frontend/server_response_writable.h");

	#[namespace = "netsim::frontend"]
	type CxxServerResponseWriter;

	#[namespace = "netsim::frontend"]
	fn put_ok_with_length(self: &CxxServerResponseWriter, mime_type: &CxxString, length: usize);

	#[namespace = "netsim::frontend"]
	fn put_chunk(self: &CxxServerResponseWriter, chunk: &[u8]);

	#[namespace = "netsim::frontend"]
	fn put_ok(self: &CxxServerResponseWriter, mime_type: &CxxString, body: &CxxString);

	#[namespace = "netsim::frontend"]
	fn put_error(self: &CxxServerResponseWriter, error_code: u32, error_message: &CxxString);

	}
	}

	#[allow(unsafe_op_in_unsafe_fn)]
	#[cxx::bridge(namespace = "netsim")]
	pub mod ffi_util {
	extern "Rust" {
	// Ranging

	#[cxx_name = "DistanceToRssi"]
	fn distance_to_rssi(tx_power: i8, distance: f32) -> i8;

	// Version

	#[cxx_name = "GetVersion"]
	fn get_version() -> String;
	}

	#[allow(dead_code)]
	unsafe extern "C++" {

	// OS utilities.
	include!("util/os_utils.h");

	#[rust_name = redirect_std_stream]
	#[namespace = "netsim::osutils"]
	#[cfg(not(feature = "cuttlefish"))]
	pub fn RedirectStdStream(netsim_temp_dir: &CxxString);

	// Crash report.
	include!("util/crash_report.h");

	#[rust_name = set_up_crash_report]
	#[namespace = "netsim"]
	pub fn SetUpCrashReport();

	// Frontend client.
	include!("frontend/frontend_client_stub.h");

	#[rust_name = is_netsimd_alive]
	#[namespace = "netsim::frontend"]
	pub fn IsNetsimdAlive(instance_num: u16) -> bool;

	}
	}

	// It's required so `RustBluetoothChip` can be sent between threads safely.
	// Ref: How to use opaque types in threads? https://github.com/dtolnay/cxx/issues/1175
	// SAFETY: Nothing in `RustBluetoothChip` depends on being run on a particular thread.
	unsafe impl Send for ffi_bluetooth::RustBluetoothChip {}

	type DynRustBluetoothChipCallbacks = Box<dyn RustBluetoothChipCallbacks>;

	fn tick(dyn_callbacks: &mut DynRustBluetoothChipCallbacks) {
	(**dyn_callbacks).tick();
	}

	fn receive_link_layer_packet(
	dyn_callbacks: &mut DynRustBluetoothChipCallbacks,
	source_address: String,
	destination_address: String,
	packet_type: u8,
	packet: &[u8],
	) {
	(**dyn_callbacks).receive_link_layer_packet(
	source_address,
	destination_address,
	packet_type,
	packet,
	);
	}

	/// CxxServerResponseWriter is defined in server_response_writable.h
	/// Wrapper struct allows the impl to discover the respective C++ methods
	pub struct CxxServerResponseWriterWrapper<'a> {
	pub writer: Pin<&'a mut ffi_response_writable::CxxServerResponseWriter>,
	}

	impl ServerResponseWritable for CxxServerResponseWriterWrapper<'_> {
	fn put_ok_with_length(&mut self, mime_type: &str, length: usize, _headers: StrHeaders) {
	let_cxx_string!(mime_type = mime_type);
	self.writer.put_ok_with_length(&mime_type, length);
	}
	fn put_chunk(&mut self, chunk: &[u8]) {
	self.writer.put_chunk(chunk);
	}
	fn put_ok(&mut self, mime_type: &str, body: &str, _headers: StrHeaders) {
	let_cxx_string!(mime_type = mime_type);
	let_cxx_string!(body = body);
	self.writer.put_ok(&mime_type, &body);
	}
	fn put_error(&mut self, error_code: u16, error_message: &str) {
	let_cxx_string!(error_message = error_message);
	self.writer.put_error(error_code.into(), &error_message);
	}

	fn put_ok_with_vec(&mut self, _mime_type: &str, _body: Vec<u8>, _headers: StrHeaders) {
	todo!()
	}
	fn put_ok_switch_protocol(&mut self, _connection: &str, _headers: StrHeaders) {
	todo!()
	}
	}