// Copyright 2019-2021 Parity Technologies (UK) Ltd.
//
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//
// The above copyright notice and this permission notice
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// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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//! 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))
}