splinter 0.4.1

Splinter is a privacy-focused platform for distributed applications that provides a blockchain-inspired networking environment for communication and transactions between organizations.
Documentation 
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// Copyright 2018-2020 Cargill Incorporated
//
// 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 std::io::{self, Read, Write};
use std::os::unix::io::AsRawFd;

use mio::{unix::EventedFd, Evented, Poll, PollOpt, Ready, Token};
use websocket::{
    client::sync::Client,
    message::{Message, OwnedMessage::Binary},
    result::WebSocketError,
    stream::sync::{AsTcpStream, Stream},
};

use crate::transport::{Connection, DisconnectError, RecvError, SendError};

pub(super) struct WsClientConnection<S>
where
    S: Read + Write + Send,
{
    client: Client<S>,
    remote_endpoint: String,
    local_endpoint: String,
}

impl<S> WsClientConnection<S>
where
    S: Read + Write + Send,
{
    pub fn new(client: Client<S>, remote_endpoint: String, local_endpoint: String) -> Self {
        WsClientConnection {
            client,
            remote_endpoint,
            local_endpoint,
        }
    }
}

impl<S> Connection for WsClientConnection<S>
where
    S: AsTcpStream + Stream + Read + Write + Send,
{
    fn send(&mut self, message: &[u8]) -> Result<(), SendError> {
        Ok(self.client.send_message(&Message::binary(message))?)
    }

    fn recv(&mut self) -> Result<Vec<u8>, RecvError> {
        match self.client.recv_message() {
            Ok(message) => match message {
                Binary(v) => Ok(v),
                _ => Err(RecvError::ProtocolError(
                    "message received was not
                        websocket::message::OwnedMessage::Binary"
                        .to_string(),
                )),
            },
            Err(WebSocketError::IoError(ref e)) if e.kind() == io::ErrorKind::WouldBlock => {
                Err(RecvError::WouldBlock)
            }
            Err(WebSocketError::NoDataAvailable) => Err(RecvError::WouldBlock),
            Err(err) => Err(err.into()),
        }
    }

    fn remote_endpoint(&self) -> String {
        self.remote_endpoint.clone()
    }

    fn local_endpoint(&self) -> String {
        self.local_endpoint.clone()
    }

    fn disconnect(&mut self) -> Result<(), DisconnectError> {
        self.client.shutdown().map_err(DisconnectError::from)
    }

    fn evented(&self) -> &dyn Evented {
        self
    }
}

impl<S> Evented for WsClientConnection<S>
where
    S: AsTcpStream + Stream + Read + Write + Send,
{
    fn register(
        &self,
        poll: &Poll,
        token: Token,
        interest: Ready,
        opts: PollOpt,
    ) -> io::Result<()> {
        EventedFd(&self.client.stream_ref().as_tcp().as_raw_fd())
            .register(poll, token, interest, opts)
    }

    fn reregister(
        &self,
        poll: &Poll,
        token: Token,
        interest: Ready,
        opts: PollOpt,
    ) -> io::Result<()> {
        EventedFd(&self.client.stream_ref().as_tcp().as_raw_fd())
            .reregister(poll, token, interest, opts)
    }

    fn deregister(&self, poll: &Poll) -> io::Result<()> {
        EventedFd(&self.client.stream_ref().as_tcp().as_raw_fd()).deregister(poll)
    }
}

impl From<WebSocketError> for RecvError {
    fn from(err: WebSocketError) -> Self {
        match err {
            WebSocketError::IoError(e) => RecvError::from(e),
            _ => RecvError::ProtocolError(format!("WebSocketError: {}", err.to_string())),
        }
    }
}

impl From<WebSocketError> for SendError {
    fn from(err: WebSocketError) -> Self {
        match err {
            WebSocketError::IoError(e) => SendError::from(e),
            _ => SendError::ProtocolError(format!("WebSocketError: {}", err.to_string())),
        }
    }
}