exonum 0.6.0

An extensible framework for blockchain software projects.
Documentation 
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// Copyright 2017 The Exonum Team
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.


use futures::{self, Future, Sink, Stream};
use futures::sync::mpsc;
use tokio_core::reactor::{Handle, Timeout};

use std::io;
use std::time::{Duration, SystemTime};

use super::error::{into_other, other_error};
use super::{InternalRequest, TimeoutRequest, InternalEvent, to_box};

#[derive(Debug)]
pub struct InternalPart {
    pub internal_tx: mpsc::Sender<InternalEvent>,
    pub internal_requests_rx: mpsc::Receiver<InternalRequest>,
}

impl InternalPart {
    pub fn run(self, handle: Handle) -> Box<Future<Item = (), Error = io::Error>> {
        let internal_tx = self.internal_tx.clone();
        let fut = self.internal_requests_rx
            .for_each(move |request| {
                let event = match request {
                    InternalRequest::Timeout(TimeoutRequest(time, timeout)) => {
                        let duration = time.duration_since(SystemTime::now()).unwrap_or_else(|_| {
                            Duration::from_millis(0)
                        });
                        let internal_tx = internal_tx.clone();
                        let fut = Timeout::new(duration, &handle)
                            .expect("Unable to create timeout")
                            .and_then(move |_| {
                                internal_tx
                                    .clone()
                                    .send(InternalEvent::Timeout(timeout))
                                    .map(drop)
                                    .map_err(into_other)
                            })
                            .map_err(|_| panic!("Can't timeout"));
                        to_box(fut)
                    }
                    InternalRequest::JumpToRound(height, round) => {
                        let internal_tx = internal_tx.clone();
                        let f = futures::lazy(move || {
                            internal_tx
                                .send(InternalEvent::JumpToRound(height, round))
                                .map(drop)
                                .map_err(into_other)
                        }).map_err(|_| panic!("Can't execute jump to round"));
                        to_box(f)
                    }
                    InternalRequest::Shutdown => {
                        let internal_tx = internal_tx.clone();
                        let f = futures::lazy(move || {
                            internal_tx
                                .send(InternalEvent::Shutdown)
                                .map(drop)
                                .map_err(into_other)
                        }).map_err(|_| panic!("Can't execute shutdown"));
                        to_box(f)
                    }
                };

                handle.spawn(event);
                Ok(())
            })
            .map_err(|_| other_error("Can't handle timeout request"));
        to_box(fut)
    }
}