e-imzo 0.4.0

E-IMZO SDK for easier accessing
Documentation 
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use crate::error::{self, Result};
use native_tls::{TlsConnector, TlsStream};
use std::marker::{self, PhantomData};
use std::net::TcpStream;
use tungstenite::{
    Message, WebSocket,
    client::client,
    handshake::client::{Request, generate_key},
};
use url::Url;

static BASE_URL: &str = "wss://127.0.0.1:64443";

/// Gateway of connected state for `Client` struct.
pub struct Connected;

/// Gateway of disconnected state for `Client` struct, which is defaulted.
pub struct Disconnected;

/// The client instance for transmitting data through WebSocket connection
pub struct Client<State> {
    pub socket: WebSocket<TlsStream<TcpStream>>,
    /// Connected Marker
    _state: marker::PhantomData<State>,
}

impl Client<Disconnected> {
    pub fn connect<T>(url: Option<T>) -> Result<Client<Connected>>
    where
        T: ToString,
    {
        let url = match url {
            Some(v) => v.to_string(),
            None => BASE_URL.to_string(),
        };

        let url = Url::parse(&format!("{url}/service/cryptapi"))?;

        // Establish a TCP connection, then wrap the TCP stream with TLS and connect to the server
        let tls = TlsConnector::builder()
            .danger_accept_invalid_certs(true)
            .build()?;

        let remote_addr = match (url.host(), url.port()) {
            (Some(host), Some(port)) => Some(format!("{host}:{port}")),
            _ => None,
        }
        .ok_or(())
        .unwrap();

        let req = Request::builder()
            .method("GET")
            .header("Host", "localhost")
            .header("Connection", "Upgrade")
            .header("Upgrade", "websocket")
            .header("Origin", "https://localhost")
            .header("Sec-WebSocket-Version", "13")
            .header("Sec-WebSocket-Key", generate_key())
            .uri(url.to_string())
            .body(())
            .unwrap();
        let tcp_stream = std::net::TcpStream::connect(remote_addr.clone())?;
        let tls_stream = tls.connect(remote_addr.as_str(), tcp_stream)?;

        let (socket, _) = client(req, tls_stream)?;

        let connection = Client {
            socket,
            _state: PhantomData,
        };

        Ok(connection)
    }
}

impl Client<Connected> {
    pub fn send_and_wait(&mut self, message: Message) -> Result<Message, error::EIMZOError> {
        self.socket.send(message)?;

        loop {
            let msg = self.socket.read()?;
            match msg {
                Message::Ping(payload) => {
                    self.socket.send(Message::Pong(payload))?;
                }
                Message::Pong(_) => continue,
                // Return the Text, Binary, or Close frame to the caller
                Message::Text(msg) => return Ok(Message::Text(msg)),
                Message::Close(msg) => {
                    return Err(error::EIMZOError::WebsocketClosed(msg));
                }
                _ => {
                    return Err(error::EIMZOError::Unknown);
                }
            }
        }
    }
}