jsglue 0.1.0

A Rust framework for building frontends with JS/TS!
Documentation 
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use anyhow::Result;
use http_body_util::Full;
use hyper::{
    body::{Bytes, Incoming},
    client::conn::http1::{handshake, SendRequest},
    header::{HeaderValue, HOST},
    HeaderMap, Method, Request, Response, Uri,
};
use hyper_util::rt::TokioIo;
use tokio::{net::TcpStream, spawn};

use crate::{framework::Framework, util::scheme_port};

#[derive(Debug, Clone)]
pub struct ProxyState {
    /// The base URL. Must be `http(s)://[domain]:[port]`.
    /// This MUST not have a trailing slash.
    pub(crate) base: String,

    /// The framework.
    pub(crate) framework: Framework,
}

impl ProxyState {
    pub fn new<T>(base: T, framework: Framework) -> Self
    where
        T: AsRef<str>,
    {
        Self {
            base: base.as_ref().to_string(),
            framework,
        }
    }

    pub(crate) async fn create_sender(&self) -> Result<SendRequest<Full<Bytes>>> {
        let url = self.base.parse::<Uri>()?;
        let host = url.host().ok_or(anyhow!("Cannot get host from URL!"))?;

        let port = url
            .port_u16()
            .unwrap_or(scheme_port(url.scheme_str().unwrap_or("http")));

        let addr = format!("{}:{}", host, port);
        let stream = TcpStream::connect(addr).await?;
        let io = TokioIo::new(stream);
        let (sender, conn) = handshake(io).await?;

        spawn(async move {
            if let Err(err) = conn.await {
                error!("Connection failed: {:?}", err);
            }
        });

        Ok(sender)
    }

    pub async fn request<T>(
        &self,
        method: Method,
        url: T,
        query: Option<Vec<(String, String)>>,
        body: Option<Bytes>,
        headers: Option<HeaderMap<HeaderValue>>,
    ) -> Result<Response<Incoming>>
    where
        T: AsRef<str>,
    {
        let mut sender = self.create_sender().await?;
        let mut url = url.as_ref().split('?').nth(0).unwrap().to_string();

        if let Some(query) = query {
            let mut buf = String::new();

            for (key, val) in query {
                let part = format!("{}={}", key, val);

                if buf.is_empty() {
                    buf.push_str(&format!("?{}", part));
                } else {
                    buf.push_str(&format!("&{}", part));
                }
            }

            url = format!("{}{}", url, buf);
        }

        let abs_url = format!("{}{}", self.base, url).parse::<Uri>()?;

        let authority = abs_url
            .authority()
            .ok_or(anyhow!("Cannot get authority from URL!"))?
            .clone();

        let mut builder = Request::builder()
            .uri(url)
            .method(method)
            .header(HOST, authority.as_str());

        if let Some(headers) = headers {
            for (key, value) in headers {
                if let Some(key) = key {
                    builder = builder.header(key, value);
                }
            }
        }

        let body = body.map(Full::new).unwrap_or(Full::new(Bytes::new()));

        let req = builder.body(body)?;

        Ok(sender.send_request(req).await?)
    }
}