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// Copyright 2019-2021 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any
// person obtaining a copy of this software and associated
// documentation files (the "Software"), to deal in the
// Software without restriction, including without
// limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice
// shall be included in all copies or substantial portions
// of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
// IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//! This example sets a custom tower service middleware to the RPC implementation.
use hyper::body::Bytes;
use std::iter::once;
use std::net::SocketAddr;
use std::time::Duration;
use tower_http::sensitive_headers::SetSensitiveRequestHeadersLayer;
use tower_http::trace::{DefaultMakeSpan, DefaultOnResponse, TraceLayer};
use tower_http::LatencyUnit;
use jsonrpsee::core::client::ClientT;
use jsonrpsee::http_client::HttpClientBuilder;
use jsonrpsee::http_server::{HttpServerBuilder, HttpServerHandle, RpcModule};
#[tokio::main]
async fn main() -> anyhow::Result<()> {
tracing_subscriber::FmtSubscriber::builder()
.with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
.try_init()
.expect("setting default subscriber failed");
let (addr, _handler) = run_server().await?;
let url = format!("http://{}", addr);
let client = HttpClientBuilder::default().build(&url)?;
let response: String = client.request("say_hello", None).await?;
println!("[main]: response: {:?}", response);
let _response: Result<String, _> = client.request("unknown_method", None).await;
let _ = client.request::<String>("say_hello", None).await?;
Ok(())
}
async fn run_server() -> anyhow::Result<(SocketAddr, HttpServerHandle)> {
// Custom tower service to handle the RPC requests
let service_builder = tower::ServiceBuilder::new()
// Add high level tracing/logging to all requests
.layer(
TraceLayer::new_for_http()
.on_body_chunk(|chunk: &Bytes, latency: Duration, _: &tracing::Span| {
tracing::trace!(size_bytes = chunk.len(), latency = ?latency, "sending body chunk")
})
.make_span_with(DefaultMakeSpan::new().include_headers(true))
.on_response(DefaultOnResponse::new().include_headers(true).latency_unit(LatencyUnit::Micros)),
)
// Mark the `Authorization` request header as sensitive so it doesn't show in logs
.layer(SetSensitiveRequestHeadersLayer::new(once(hyper::header::AUTHORIZATION)))
.timeout(Duration::from_secs(2));
let server =
HttpServerBuilder::new().set_middleware(service_builder).build("127.0.0.1:0".parse::<SocketAddr>()?).await?;
let addr = server.local_addr()?;
let mut module = RpcModule::new(());
module.register_method("say_hello", |_, _| Ok("lo")).unwrap();
let handler = server.start(module)?;
Ok((addr, handler))
}