140 lines
4.6 KiB
Rust
140 lines
4.6 KiB
Rust
// Copyright 2019-2021 Parity Technologies (UK) Ltd.
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//
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// Permission is hereby granted, free of charge, to any
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// person obtaining a copy of this software and associated
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// documentation files (the "Software"), to deal in the
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// Software without restriction, including without
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// limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software
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// is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice
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// shall be included in all copies or substantial portions
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// of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
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// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
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// IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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use jsonrpsee::core::client::ClientT;
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use jsonrpsee::core::middleware::{Batch, BatchEntry, Notification, RpcServiceBuilder, RpcServiceT};
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use jsonrpsee::server::Server;
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use jsonrpsee::types::Request;
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use jsonrpsee::ws_client::WsClientBuilder;
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use jsonrpsee::{RpcModule, rpc_params};
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use std::borrow::Cow as StdCow;
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use std::net::SocketAddr;
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fn modify_method_call(req: &mut Request<'_>) {
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// Example how to modify the params in the call.
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if req.method == "say_hello" {
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// It's a bit awkward to create new params in the request
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// but this shows how to do it.
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let raw_value = serde_json::value::to_raw_value("myparams").unwrap();
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req.params = Some(StdCow::Owned(raw_value));
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}
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// Re-direct all calls that isn't `say_hello` to `say_goodbye`
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else if req.method != "say_hello" {
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req.method = "say_goodbye".into();
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}
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}
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fn modify_notif(n: &mut Notification<'_>) {
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// Example how to modify the params in the notification.
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if n.method == "say_hello" {
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// It's a bit awkward to create new params in the request
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// but this shows how to do it.
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let raw_value = serde_json::value::to_raw_value("myparams").unwrap();
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n.params = Some(StdCow::Owned(raw_value));
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}
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// Re-direct all notifs that isn't `say_hello` to `say_goodbye`
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else if n.method != "say_hello" {
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n.method = "say_goodbye".into();
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}
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}
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#[derive(Clone)]
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pub struct ModifyRequestIf<S>(S);
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impl<S> RpcServiceT for ModifyRequestIf<S>
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where
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S: RpcServiceT + Send + Sync + Clone + 'static,
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{
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type MethodResponse = S::MethodResponse;
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type NotificationResponse = S::NotificationResponse;
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type BatchResponse = S::BatchResponse;
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fn call<'a>(&self, mut req: Request<'a>) -> impl Future<Output = Self::MethodResponse> + Send + 'a {
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modify_method_call(&mut req);
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self.0.call(req)
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}
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fn batch<'a>(&self, mut batch: Batch<'a>) -> impl Future<Output = Self::BatchResponse> + Send + 'a {
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for call in batch.iter_mut() {
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match call {
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Ok(BatchEntry::Call(call)) => {
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modify_method_call(call);
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}
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Ok(BatchEntry::Notification(n)) => {
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modify_notif(n);
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}
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// Invalid request, we don't care about it.
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Err(_err) => {}
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}
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}
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self.0.batch(batch)
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}
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fn notification<'a>(
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&self,
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mut n: Notification<'a>,
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) -> impl Future<Output = Self::NotificationResponse> + Send + 'a {
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modify_notif(&mut n);
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self.0.notification(n)
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}
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}
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#[tokio::main]
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async fn main() -> anyhow::Result<()> {
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tracing_subscriber::FmtSubscriber::builder()
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.with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
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.try_init()
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.expect("setting default subscriber failed");
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let addr = run_server().await?;
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let url = format!("ws://{}", addr);
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let client = WsClientBuilder::default().build(&url).await?;
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let _response: String = client.request("say_hello", rpc_params![]).await?;
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let _response: Result<String, _> = client.request("unknown_method", rpc_params![]).await;
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let _: String = client.request("say_hello", rpc_params![]).await?;
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Ok(())
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}
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async fn run_server() -> anyhow::Result<SocketAddr> {
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let rpc_middleware = RpcServiceBuilder::new().layer_fn(ModifyRequestIf);
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let server = Server::builder().set_rpc_middleware(rpc_middleware).build("127.0.0.1:0").await?;
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let mut module = RpcModule::new(());
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module.register_method("say_hello", |_, _, _| "lo")?;
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module.register_method("say_goodbye", |_, _, _| "goodbye")?;
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let addr = server.local_addr()?;
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let handle = server.start(module);
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// In this example we don't care about doing shutdown so let's it run forever.
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// You may use the `ServerHandle` to shut it down or manage it yourself.
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tokio::spawn(handle.stopped());
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Ok(addr)
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}
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