120 lines
3.9 KiB
Rust
120 lines
3.9 KiB
Rust
// Copyright 2015-2020 Parity Technologies (UK) Ltd.
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// This file is part of OpenEthereum.
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// OpenEthereum 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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// OpenEthereum 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 OpenEthereum. If not, see <http://www.gnu.org/licenses/>.
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//! OpenEthereum-specific PUB-SUB rpc implementation.
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use parking_lot::RwLock;
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use std::{sync::Arc, time::Duration};
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use jsonrpc_core::{
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self as core,
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futures::{future, Future, Sink, Stream},
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MetaIoHandler, Result,
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};
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use jsonrpc_pubsub::{typed::Subscriber, SubscriptionId};
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use tokio_timer;
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use parity_runtime::Executor;
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use v1::{helpers::GenericPollManager, metadata::Metadata, 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(
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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(
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rpc: MetaIoHandler<Metadata, core::NoopMiddleware>,
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executor: Executor,
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) -> 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(
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&self,
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mut meta: Metadata,
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subscriber: Subscriber<core::Value>,
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method: String,
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params: Option<core::Params>,
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) {
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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(
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receiver
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.forward(sink.sink_map_err(|e| {
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warn!("Cannot send notification: {:?}", e);
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}))
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.map(|_| ()),
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);
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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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