| // Copyright 2020 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Note: this file must be kept in sync with |
| // docs/development/languages/fidl/tutorials/rust/basic/server.md |
| |
| use anyhow::{Context as _, Error}; |
| use fidl_fuchsia_examples::{EchoRequest, EchoRequestStream}; |
| use fuchsia_async as fasync; |
| use fuchsia_component::server::ServiceFs; |
| use futures::prelude::*; |
| |
| // [START impl] |
| // An implementation of the Echo stream, which handles a stream of EchoRequests |
| async fn run_echo_server(stream: EchoRequestStream) -> Result<(), Error> { |
| stream |
| .map(|result| result.context("failed request")) |
| .try_for_each(|request| async move { |
| match request { |
| // Handle each EchoString request by responding with the request |
| // value |
| EchoRequest::EchoString { value, responder } => { |
| println!("Received EchoString request for string {:?}", value); |
| responder.send(&value).context("error sending response")?; |
| println!("Response sent successfully"); |
| } |
| // Handle each SendString request by sending a single OnString |
| // event with the request value |
| EchoRequest::SendString { value, control_handle } => { |
| println!("Received SendString request for string {:?}", value); |
| control_handle.send_on_string(&value).context("error sending event")?; |
| println!("Event sent successfully"); |
| } |
| } |
| Ok(()) |
| }) |
| .await |
| } |
| // [END impl] |
| |
| // [START enum] |
| enum IncomingService { |
| // Host a service protocol. |
| Echo(EchoRequestStream), |
| // ... more services here |
| } |
| // [END enum] |
| |
| // [START main] |
| #[fasync::run_singlethreaded] |
| async fn main() -> Result<(), Error> { |
| // Initialize the outgoing services provided by this component |
| let mut fs = ServiceFs::new_local(); |
| fs.dir("svc").add_fidl_service(IncomingService::Echo); |
| |
| // Serve the outgoing services |
| fs.take_and_serve_directory_handle()?; |
| |
| // Listen for incoming requests to connect to Echo, and call run_echo_server |
| // on each one |
| println!("Listening for incoming connections..."); |
| const MAX_CONCURRENT: usize = 10_000; |
| fs.for_each_concurrent(MAX_CONCURRENT, |IncomingService::Echo(stream)| { |
| run_echo_server(stream).unwrap_or_else(|e| println!("{:?}", e)) |
| }) |
| .await; |
| |
| Ok(()) |
| } |
| // [END main] |