107 lines
3.4 KiB
Rust
107 lines
3.4 KiB
Rust
// Copyright 2015-2019 Parity Technologies (UK) Ltd.
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// This file is part of Parity Ethereum.
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// Parity Ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity Ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity Ethereum. If not, see <http://www.gnu.org/licenses/>.
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//! Parity-specific PUB-SUB rpc implementation.
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use std::sync::Arc;
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use std::time::Duration;
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use parking_lot::RwLock;
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use jsonrpc_core::{self as core, Result, MetaIoHandler};
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use jsonrpc_core::futures::{future, Future, Stream, Sink};
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use jsonrpc_pubsub::typed::Subscriber;
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use jsonrpc_pubsub::SubscriptionId;
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use tokio_timer;
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use parity_runtime::Executor;
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use v1::helpers::GenericPollManager;
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use v1::metadata::Metadata;
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use v1::traits::PubSub;
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/// Parity PubSub implementation.
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pub struct PubSubClient<S: core::Middleware<Metadata>> {
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poll_manager: Arc<RwLock<GenericPollManager<S>>>,
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executor: Executor,
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}
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impl<S: core::Middleware<Metadata>> PubSubClient<S> {
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/// Creates new `PubSubClient`.
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pub fn new(rpc: MetaIoHandler<Metadata, S>, executor: Executor) -> Self {
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let poll_manager = Arc::new(RwLock::new(GenericPollManager::new(rpc)));
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let pm2 = Arc::downgrade(&poll_manager);
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let timer = tokio_timer::wheel()
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.tick_duration(Duration::from_millis(500))
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.build();
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// Start ticking
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let interval = timer.interval(Duration::from_millis(1000));
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executor.spawn(interval
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.map_err(|e| warn!("Polling timer error: {:?}", e))
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.for_each(move |_| {
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if let Some(pm2) = pm2.upgrade() {
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pm2.read().tick()
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} else {
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Box::new(future::err(()))
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}
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})
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);
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PubSubClient {
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poll_manager,
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executor,
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}
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}
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}
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impl PubSubClient<core::NoopMiddleware> {
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/// Creates new `PubSubClient` with deterministic ids.
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#[cfg(test)]
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pub fn new_test(rpc: MetaIoHandler<Metadata, core::NoopMiddleware>, executor: Executor) -> Self {
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let client = Self::new(MetaIoHandler::with_middleware(Default::default()), executor);
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*client.poll_manager.write() = GenericPollManager::new_test(rpc);
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client
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}
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}
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impl<S: core::Middleware<Metadata>> PubSub for PubSubClient<S> {
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type Metadata = Metadata;
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fn parity_subscribe(&self, mut meta: Metadata, subscriber: Subscriber<core::Value>, method: String, params: Option<core::Params>) {
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let params = params.unwrap_or_else(|| core::Params::Array(vec![]));
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// Make sure to get rid of PubSub session otherwise it will never be dropped.
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meta.session = None;
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let mut poll_manager = self.poll_manager.write();
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let (id, receiver) = poll_manager.subscribe(meta, method, params);
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match subscriber.assign_id(id.clone()) {
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Ok(sink) => {
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self.executor.spawn(receiver.forward(sink.sink_map_err(|e| {
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warn!("Cannot send notification: {:?}", e);
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})).map(|_| ()));
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},
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Err(_) => {
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poll_manager.unsubscribe(&id);
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},
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}
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}
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fn parity_unsubscribe(&self, _: Option<Self::Metadata>, id: SubscriptionId) -> Result<bool> {
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let res = self.poll_manager.write().unsubscribe(&id);
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Ok(res)
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}
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}
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