126 lines
3.4 KiB
Rust
126 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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//! A map of subscribers.
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use std::{ops, str};
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use std::collections::HashMap;
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use jsonrpc_pubsub::{typed::{Subscriber, Sink}, SubscriptionId};
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use rand::{Rng, StdRng};
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use v1::types::H64;
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#[derive(Debug, Clone, Hash, Eq, PartialEq)]
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pub struct Id(H64);
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impl str::FromStr for Id {
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type Err = String;
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fn from_str(s: &str) -> Result<Self, Self::Err> {
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if s.starts_with("0x") {
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Ok(Id(s[2..].parse().map_err(|e| format!("{}", e))?))
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} else {
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Err("The id must start with 0x".into())
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}
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}
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}
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impl Id {
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pub fn as_string(&self) -> String {
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format!("0x{:?}", self.0)
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}
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}
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#[derive(Clone)]
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pub struct Subscribers<T> {
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rand: StdRng,
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subscriptions: HashMap<Id, T>,
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}
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impl<T> Default for Subscribers<T> {
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fn default() -> Self {
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Subscribers {
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rand: StdRng::new().expect("Valid random source is required."),
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subscriptions: HashMap::new(),
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}
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}
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}
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impl<T> Subscribers<T> {
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/// Create a new Subscribers with given random source.
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#[cfg(test)]
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pub fn new_test() -> Self {
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Subscribers {
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rand: ::rand::SeedableRng::from_seed([0usize].as_ref()),
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subscriptions: HashMap::new(),
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}
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}
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fn next_id(&mut self) -> Id {
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let mut data = H64::default();
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self.rand.fill_bytes(&mut data.0);
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Id(data)
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}
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/// Insert new subscription and return assigned id.
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pub fn insert(&mut self, val: T) -> SubscriptionId {
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let id = self.next_id();
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debug!(target: "pubsub", "Adding subscription id={:?}", id);
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let s = id.as_string();
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self.subscriptions.insert(id, val);
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SubscriptionId::String(s)
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}
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/// Removes subscription with given id and returns it (if any).
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pub fn remove(&mut self, id: &SubscriptionId) -> Option<T> {
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trace!(target: "pubsub", "Removing subscription id={:?}", id);
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match *id {
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SubscriptionId::String(ref id) => match id.parse() {
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Ok(id) => self.subscriptions.remove(&id),
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Err(_) => None,
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},
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_ => None,
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}
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}
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}
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impl<T> Subscribers<Sink<T>> {
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/// Assigns id and adds a subscriber to the list.
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pub fn push(&mut self, sub: Subscriber<T>) {
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let id = self.next_id();
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if let Ok(sink) = sub.assign_id(SubscriptionId::String(id.as_string())) {
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debug!(target: "pubsub", "Adding subscription id={:?}", id);
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self.subscriptions.insert(id, sink);
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}
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}
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}
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impl<T, V> Subscribers<(Sink<T>, V)> {
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/// Assigns id and adds a subscriber to the list.
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pub fn push(&mut self, sub: Subscriber<T>, val: V) {
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let id = self.next_id();
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if let Ok(sink) = sub.assign_id(SubscriptionId::String(id.as_string())) {
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debug!(target: "pubsub", "Adding subscription id={:?}", id);
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self.subscriptions.insert(id, (sink, val));
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}
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}
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}
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impl<T> ops::Deref for Subscribers<T> {
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type Target = HashMap<Id, T>;
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fn deref(&self) -> &Self::Target {
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&self.subscriptions
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}
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}
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