105 lines
3.7 KiB
Rust
105 lines
3.7 KiB
Rust
// Copyright 2019-2022 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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//! This example adds upstream CORS layers to the RPC service,
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//! with access control allowing requests from all hosts.
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use hyper::Method;
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use jsonrpsee::server::{RpcModule, Server};
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use std::net::SocketAddr;
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use tower_http::cors::{Any, CorsLayer};
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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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// Start up a JSON-RPC server that allows cross origin requests.
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let server_addr = run_server().await?;
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// Print instructions for testing CORS from a browser.
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println!("Run the following snippet in the developer console in any Website.");
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println!(
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r#"
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fetch("http://{}", {{
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method: 'POST',
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mode: 'cors',
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headers: {{ 'Content-Type': 'application/json' }},
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body: JSON.stringify({{
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jsonrpc: '2.0',
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method: 'say_hello',
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id: 1
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}})
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}}).then(res => {{
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console.log("Response:", res);
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return res.text()
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}}).then(body => {{
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console.log("Response Body:", body)
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}});
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"#,
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server_addr
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);
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futures::future::pending().await
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}
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async fn run_server() -> anyhow::Result<SocketAddr> {
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// Add a CORS middleware for handling HTTP requests.
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// This middleware does affect the response, including appropriate
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// headers to satisfy CORS. Because any origins are allowed, the
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// "Access-Control-Allow-Origin: *" header is appended to the response.
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let cors = CorsLayer::new()
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// Allow `POST` when accessing the resource
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.allow_methods([Method::POST])
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// Allow requests from any origin
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.allow_origin(Any)
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.allow_headers([hyper::header::CONTENT_TYPE]);
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let middleware = tower::ServiceBuilder::new().layer(cors);
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// The RPC exposes the access control for filtering and the middleware for
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// modifying requests / responses. These features are independent of one another
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// and can also be used separately.
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// In this example, we use both features.
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let server = Server::builder().set_http_middleware(middleware).build("127.0.0.1:0".parse::<SocketAddr>()?).await?;
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let mut module = RpcModule::new(());
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module.register_method("say_hello", |_, _, _| {
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println!("say_hello method called!");
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"Hello there!!"
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})?;
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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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