Failed to emit plain text

[SSebo]

Javascript socket.io client can emit plain text. rust_socketio currently is not capable of.

client.emit('message-received', data); // javascript

For example on will received a payload. can not just emit that payload back when it is plain text.
currently should use json!() macro to encode.

let socket = ClientBuilder::new("http://localhost:4200")
       .namespace("/admin")
       .on("message-received", |p, socket| {
            let s = match &p {
                Payload::String(s) => s,
                _ => "",
            };
            println!("message-received {:?}", s);
            let _ = socket.emit("utf-8™", p); // will failed
        })
       .connect()

because of this function

rust-socketio/socketio/src/socket.rs

Lines 84 to 118 in 4eea9b7

	pub(crate) fn build_packet_for_payload<'a>(
	&'a self,
	payload: Payload,
	event: Event,
	nsp: &'a str,
	id: Option<i32>,
	) -> Result<Packet> {
	match payload {
	Payload::Binary(bin_data) => Ok(Packet::new(
	if id.is_some() {
	PacketId::BinaryAck
	} else {
	PacketId::BinaryEvent
	},
	nsp.to_owned(),
	Some(serde_json::Value::String(event.into()).to_string()),
	id,
	1,
	Some(vec![bin_data]),
	)),
	Payload::String(str_data) => {
	serde_json::from_str::<serde_json::Value>(&str_data)?;
	let payload = format!("[\"{}\",{}]", String::from(event), str_data);
	Ok(Packet::new(
	PacketId::Event,
	nsp.to_owned(),
	Some(payload),
	id,
	0,
	None,
	))
	}
	}

this line

rust-socketio/socketio/src/socket.rs

Line 105 in 4eea9b7

serde_json::from_str::<serde_json::Value>(&str_data)?;