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Replace unbounded channels with bounded ones. (#1191) * Replace unbounded channels with bounded ones. To remove the unbounded channels used for communicating with node tasks an API similar to `futures::Sink` is used, i.e. sending is split into a start and complete phase. The start phase returns `StartSend` and first attempts to complete any pending send operations. Completing the send means polling until `Poll::Ready(())` is returned. In addition this PR has split the `handled_node_tasks` module into several smaller ones (cf. `nodes::tasks`) and renamed some types: - `nodes::handled_node_tasks::NodeTask` -> `nodes::tasks::task::Task` - `nodes::handled_node_tasks::NodeTaskInner` -> `nodes::tasks::task::State` - `nodes::handled_node_tasks::NodeTasks` -> `nodes::tasks::Manager` - `nodes::handled_node_tasks::TaskClosedEvent` -> `nodes::tasks::Error` - `nodes::handled_node_tasks::HandledNodesEvent` -> `nodes::tasks::Event` - `nodes::handled_node_tasks::Task` -> `nodes::tasks::TaskEntry` - `nodes::handled_node_tasks::ExtToInMessage` -> `nodes::tasks::task::ToTaskMessage` - `nodes::handled_node_tasks::InToExtMessage` -> `nodes::tasks::task::FromTaskMessage` * `take_over_to_complete` can be an `Option`. Since it is always holding just a single pending message. * `send_event_to_complete` can be an `Option`. * Update core/src/nodes/tasks/manager.rs Co-Authored-By: Pierre Krieger <pierre.krieger1708@gmail.com> * Update core/src/nodes/tasks/manager.rs Co-Authored-By: Pierre Krieger <pierre.krieger1708@gmail.com> * Add comments to explain the need to flush sends ... of take-over and event messages delivered over Sinks.
2019-07-09 16:47:24 +02:00
// Copyright 2019 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//! Management of tasks handling nodes.
//!
//! The core type is a [`task::Task`], which implements [`futures::Future`]
//! and connects and handles a node. A task receives and sends messages
//! ([`tasks::FromTaskMessage`], [`tasks::ToTaskMessage`]) to the outside.
//!
//! A set of tasks is managed by a [`Manager`] which creates tasks when a
//! node should be connected to (cf. [`Manager::add_reach_attempt`]) or
//! an existing connection to a node should be driven forward (cf.
//! [`Manager::add_connection`]). Tasks can be referred to by [`TaskId`]
//! and messages can be sent to individual tasks or all (cf.
//! [`Manager::start_broadcast`]). Messages produces by tasks can be
//! retrieved by polling the manager (cf. [`Manager::poll`]).
mod error;
mod manager;
mod task;
pub use error::Error;
pub use manager::{ClosedTask, TaskEntry, Manager, Event, StartTakeOver};
/// Task identifier.
#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
pub struct TaskId(usize);