Websocket JSON parsing type mismatch - json

Question

I'm trying to hack together a simple WebSocket client using tungstenite that parses JSON. Most of the code comes from this example.
If I do println!("{}", msg) It works fine, so I'm not sure why the type is mismatched (msg is supposedly a string right?). https://docs.rs/tungstenite/0.6.1/tungstenite/protocol/enum.Message.html
use tungstenite::{connect};
use url::Url;
use serde_json;
fn main() {
let (mut socket, _response) =
connect(Url::parse("wss://www.bitmex.com/realtime?subscribe=trade:XBTUSD").unwrap()).expect("Can't connect");
loop {
let msg = socket.read_message().expect("Error reading message");
let parsed: serde_json::Value = serde_json::from_str(&msg).expect("Can't parse to JSON");
println!("{:?}", parsed["data"][0]["price"]);
}
}
error[E0308]: mismatched types
--> src/main.rs:12:62
|
12 | let parsed: serde_json::Value = serde_json::from_str(&msg).expect("Can't parse to JSON");
| ^^^^ expected `str`, found enum `tungstenite::protocol::message::Message`
|
= note: expected reference `&str`
found reference `&tungstenite::protocol::message::Message`
[dependencies]
tungstenite = "0.10.1"
url = "2.1.1"
serde_json = "1.0.53"

Answer 1

Something like this will work:
use tungstenite::{connect};
use url::Url;
use serde_json;
fn main() {
let (mut socket, _response) =
connect(Url::parse("wss://www.bitmex.com/realtime?subscribe=trade:XBTUSD").unwrap()).expect("Can't connect");
loop {
let msg = socket.read_message().expect("Error reading message");
let msg = match msg {
tungstenite::Message::Text(s) => { s }
_ => { panic!() }
};
let parsed: serde_json::Value = serde_json::from_str(&msg).expect("Can't parse to JSON");
println!("{:?}", parsed["data"][0]["price"]);
}
}