124 lines
4.0 KiB
Rust
124 lines
4.0 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 std::net::SocketAddr;
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use jsonrpsee::core::{SubscriptionResult, async_trait, client::Subscription};
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use jsonrpsee::proc_macros::rpc;
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use jsonrpsee::server::{PendingSubscriptionSink, Server};
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use jsonrpsee::types::ErrorObjectOwned;
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use jsonrpsee::ws_client::WsClientBuilder;
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type ExampleHash = [u8; 32];
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type ExampleStorageKey = Vec<u8>;
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#[rpc(server, client, namespace = "state")]
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pub trait Rpc<Hash, StorageKey>
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where
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Hash: std::fmt::Debug,
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{
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/// Async method call example.
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#[method(name = "getKeys")]
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async fn storage_keys(
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&self,
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storage_key: StorageKey,
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hash: Option<Hash>,
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) -> Result<Vec<StorageKey>, ErrorObjectOwned>;
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/// Subscription that takes a `StorageKey` as input and produces a `Vec<Hash>`.
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#[subscription(name = "subscribeStorage" => "override", item = Vec<Hash>)]
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async fn subscribe_storage(&self, keys: Option<Vec<StorageKey>>) -> SubscriptionResult;
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#[subscription(name = "subscribeSync" => "sync", item = Vec<Hash>)]
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fn s(&self, keys: Option<Vec<StorageKey>>);
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}
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pub struct RpcServerImpl;
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#[async_trait]
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impl RpcServer<ExampleHash, ExampleStorageKey> for RpcServerImpl {
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async fn storage_keys(
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&self,
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storage_key: ExampleStorageKey,
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_hash: Option<ExampleHash>,
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) -> Result<Vec<ExampleStorageKey>, ErrorObjectOwned> {
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Ok(vec![storage_key])
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}
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async fn subscribe_storage(
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&self,
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pending: PendingSubscriptionSink,
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_keys: Option<Vec<ExampleStorageKey>>,
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) -> SubscriptionResult {
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let sink = pending.accept().await?;
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let json = serde_json::value::to_raw_value(&vec![[0; 32]])?;
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sink.send(json).await?;
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Ok(())
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}
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fn s(&self, pending: PendingSubscriptionSink, _keys: Option<Vec<ExampleStorageKey>>) {
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tokio::spawn(async move {
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let sink = pending.accept().await.unwrap();
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let json = serde_json::value::to_raw_value(&vec![[0; 32]]).unwrap();
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sink.send(json).await.unwrap();
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});
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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 server_addr = run_server().await?;
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let url = format!("ws://{}", server_addr);
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let client = WsClientBuilder::default().build(&url).await?;
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assert_eq!(client.storage_keys(vec![1, 2, 3, 4], None::<ExampleHash>).await.unwrap(), vec![vec![1, 2, 3, 4]]);
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let mut sub: Subscription<Vec<ExampleHash>> =
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RpcClient::<ExampleHash, ExampleStorageKey>::subscribe_storage(&client, None).await.unwrap();
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assert_eq!(Some(vec![[0; 32]]), sub.next().await.transpose().unwrap());
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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 server = Server::builder().build("127.0.0.1:0").await?;
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let addr = server.local_addr()?;
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let handle = server.start(RpcServerImpl.into_rpc());
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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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