rust_cast 0.7.0

Library that allows you to communicate with Google Cast enabled devices (eg. Chromecast).
Documentation 
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use std::borrow::Cow;
use std::cell::RefCell;
use std::io::Write;
use std::rc::Rc;

use serde_json;

use cast::proxies;
use errors::Error;
use message_manager::{CastMessage, CastMessagePayload, MessageManager};

const CHANNEL_NAMESPACE: &'static str = "urn:x-cast:com.google.cast.tp.heartbeat";

const MESSAGE_TYPE_PING: &'static str = "PING";
const MESSAGE_TYPE_PONG: &'static str = "PONG";

#[derive(Debug)]
pub enum HeartbeatResponse {
    Ping,
    Pong,
    NotImplemented(String, serde_json::Value),
}

pub struct HeartbeatChannel<'a, W> where W: Write {
    sender: Cow<'a, str>,
    receiver: Cow<'a, str>,
    writer: Rc<RefCell<W>>,
}

impl<'a, W> HeartbeatChannel<'a, W> where W: Write {
    pub fn new<S>(sender: S, receiver: S, writer: Rc<RefCell<W>>)
        -> HeartbeatChannel<'a, W> where S: Into<Cow<'a, str>> {
        HeartbeatChannel {
            sender: sender.into(),
            receiver: receiver.into(),
            writer: writer,
        }
    }

    pub fn ping(&self) -> Result<(), Error> {
        let payload = try!(serde_json::to_string(
            &proxies::heartbeat::HeartBeatRequest {
                typ: MESSAGE_TYPE_PING.to_owned()
            }));

        MessageManager::send(&mut *self.writer.borrow_mut(), CastMessage {
            namespace: CHANNEL_NAMESPACE.to_owned(),
            source: self.sender.to_string(),
            destination: self.receiver.to_string(),
            payload: CastMessagePayload::String(payload),
        })
    }

    pub fn pong(&self) -> Result<(), Error> {
        let payload = try!(serde_json::to_string(
            &proxies::heartbeat::HeartBeatRequest {
                typ: MESSAGE_TYPE_PONG.to_owned()
            }));

        MessageManager::send(&mut *self.writer.borrow_mut(), CastMessage {
            namespace: CHANNEL_NAMESPACE.to_owned(),
            source: self.sender.to_string(),
            destination: self.receiver.to_string(),
            payload: CastMessagePayload::String(payload),
        })
    }

    pub fn can_handle(&self, message: &CastMessage) -> bool {
        message.namespace == CHANNEL_NAMESPACE
    }

    pub fn parse(&self, message: &CastMessage) -> Result<HeartbeatResponse, Error> {
        let reply = match message.payload {
            CastMessagePayload::String(ref payload) => try!(
                serde_json::from_str::<serde_json::Value>(payload)),
            _ => return Err(Error::Internal("Binary payload is not supported!".to_owned())),
        };

        let message_type = reply.as_object()
            .and_then(|object| object.get("type"))
            .and_then(|property| property.as_string())
            .unwrap_or("")
            .to_owned();

        let response = match message_type.as_ref() {
            MESSAGE_TYPE_PING => HeartbeatResponse::Ping,
            MESSAGE_TYPE_PONG => HeartbeatResponse::Pong,
            _ => HeartbeatResponse::NotImplemented(message_type.to_owned(), reply),
        };

        Ok(response)
    }
}