use std::{
borrow::Cow,
io::{Read, Write},
};
use crate::{
Lrc,
cast::proxies,
errors::Error,
message_manager::{CastMessage, CastMessagePayload, MessageManager},
};
pub(crate) const CHANNEL_NAMESPACE: &str = "urn:x-cast:com.google.cast.tp.heartbeat";
const MESSAGE_TYPE_PING: &str = "PING";
const MESSAGE_TYPE_PONG: &str = "PONG";
#[derive(Clone, Debug)]
pub enum HeartbeatResponse {
Ping,
Pong,
NotImplemented(String, serde_json::Value),
}
pub struct HeartbeatChannel<'a, W>
where
W: Read + Write,
{
sender: Cow<'a, str>,
receiver: Cow<'a, str>,
message_manager: Lrc<MessageManager<W>>,
}
impl<'a, W> HeartbeatChannel<'a, W>
where
W: Read + Write,
{
pub fn new<S>(
sender: S,
receiver: S,
message_manager: Lrc<MessageManager<W>>,
) -> HeartbeatChannel<'a, W>
where
S: Into<Cow<'a, str>>,
{
HeartbeatChannel {
sender: sender.into(),
receiver: receiver.into(),
message_manager,
}
}
pub fn ping(&self) -> Result<(), Error> {
let payload = serde_json::to_string(&proxies::heartbeat::HeartBeatRequest {
typ: MESSAGE_TYPE_PING.to_string(),
})?;
self.message_manager.send(CastMessage {
namespace: CHANNEL_NAMESPACE.to_string(),
source: self.sender.to_string(),
destination: self.receiver.to_string(),
payload: CastMessagePayload::String(payload),
})
}
pub fn pong(&self) -> Result<(), Error> {
let payload = serde_json::to_string(&proxies::heartbeat::HeartBeatRequest {
typ: MESSAGE_TYPE_PONG.to_string(),
})?;
self.message_manager.send(CastMessage {
namespace: CHANNEL_NAMESPACE.to_string(),
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) => {
serde_json::from_str::<serde_json::Value>(payload)?
}
_ => {
return Err(Error::Internal(
"Binary payload is not supported!".to_string(),
));
}
};
let message_type = reply
.as_object()
.and_then(|object| object.get("type"))
.and_then(|property| property.as_str())
.unwrap_or("")
.to_string();
let response = match message_type.as_ref() {
MESSAGE_TYPE_PING => HeartbeatResponse::Ping,
MESSAGE_TYPE_PONG => HeartbeatResponse::Pong,
_ => HeartbeatResponse::NotImplemented(message_type.to_string(), reply),
};
Ok(response)
}
}