openethereum/rpc/src/v1/tests/mocked/pubsub.rs

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// Copyright 2015-2017 Parity Technologies (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
use std::sync::{atomic, Arc};
use jsonrpc_core::{self as core, MetaIoHandler};
use jsonrpc_core::futures::{self, Stream, Future};
use jsonrpc_pubsub::Session;
use parity_reactor::EventLoop;
use v1::{PubSub, PubSubClient, Metadata};
fn rpc() -> MetaIoHandler<Metadata, core::NoopMiddleware> {
let mut io = MetaIoHandler::default();
let called = atomic::AtomicBool::new(false);
io.add_method("hello", move |_| {
if !called.load(atomic::Ordering::SeqCst) {
called.store(true, atomic::Ordering::SeqCst);
Ok(core::Value::String("hello".into()))
} else {
Ok(core::Value::String("world".into()))
}
});
io
}
#[test]
fn should_subscribe_to_a_method() {
// given
let el = EventLoop::spawn();
let rpc = rpc();
let pubsub = PubSubClient::new(rpc, el.remote()).to_delegate();
let mut io = MetaIoHandler::default();
io.extend_with(pubsub);
let mut metadata = Metadata::default();
let (sender, receiver) = futures::sync::mpsc::channel(8);
metadata.session = Some(Arc::new(Session::new(sender)));
// Subscribe
let request = r#"{"jsonrpc": "2.0", "method": "parity_subscribe", "params": ["hello", []], "id": 1}"#;
let response = r#"{"jsonrpc":"2.0","result":1,"id":1}"#;
assert_eq!(io.handle_request_sync(request, metadata.clone()), Some(response.to_owned()));
// Check notifications
let (res, receiver) = receiver.into_future().wait().unwrap();
let response = r#"{"jsonrpc":"2.0","method":"parity_subscription","params":{"result":"hello","subscription":1}}"#;
assert_eq!(res, Some(response.into()));
let (res, receiver) = receiver.into_future().wait().unwrap();
let response = r#"{"jsonrpc":"2.0","method":"parity_subscription","params":{"result":"world","subscription":1}}"#;
assert_eq!(res, Some(response.into()));
// And unsubscribe
let request = r#"{"jsonrpc": "2.0", "method": "parity_unsubscribe", "params": [1], "id": 1}"#;
let response = r#"{"jsonrpc":"2.0","result":true,"id":1}"#;
assert_eq!(io.handle_request_sync(request, metadata), Some(response.to_owned()));
let (res, _receiver) = receiver.into_future().wait().unwrap();
assert_eq!(res, None);
}