intrepid-core 0.3.0

Manage complex async business logic with ease
Documentation 
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use std::{collections::HashMap, convert::Infallible};

use axum::{
    body::{to_bytes, Body},
    extract::Request,
    response::{IntoResponse, Response},
};
use bytes::Bytes;
use futures::future::BoxFuture;
use http::StatusCode;
use tower::Service;

use crate::{Error, Frame, MessageFrame, StatefulSystem, StatelessSystem};

impl Service<Request<Body>> for StatelessSystem {
    type Response = Response<Body>;
    type Error = Infallible;
    type Future = BoxFuture<'static, Result<Self::Response, Self::Error>>;

    fn poll_ready(
        &mut self,
        _cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<std::result::Result<(), Self::Error>> {
        std::task::Poll::Ready(Ok(()))
    }

    fn call(&mut self, request: Request<Body>) -> Self::Future {
        let system = self.clone();
        let frame = HttpRequestFrame::from(request);

        Box::pin(async move {
            let frame = frame.into_frame().await;
            let response: Result<HttpFrameResponse, HttpFrameResponseError> = system
                .handle_frame(frame)
                .await
                .map(Into::into)
                .map_err(Into::into);

            Ok(response
                .map(|response| response.into_json_response())
                .into_response())
        })
    }
}

impl<State> Service<Request<Body>> for StatefulSystem<State>
where
    State: Clone + Sync + Send + 'static,
{
    type Response = Response<Body>;
    type Error = Infallible;
    type Future = BoxFuture<'static, Result<Self::Response, Self::Error>>;

    fn poll_ready(
        &mut self,
        _cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<std::result::Result<(), Self::Error>> {
        std::task::Poll::Ready(Ok(()))
    }

    fn call(&mut self, request: Request<Body>) -> Self::Future {
        let system = self.clone();
        let frame = HttpRequestFrame::from(request);

        Box::pin(async move {
            let frame = frame.into_frame().await;
            let response: Result<HttpFrameResponse, HttpFrameResponseError> = system
                .handle_frame(frame)
                .await
                .map(Into::into)
                .map_err(Into::into);

            Ok(response
                .map(|response| response.into_json_response())
                .into_response())
        })
    }
}

/// An intrepid frame being turned into an axum json response.
#[derive(Debug)]
pub struct HttpFrameResponse(Frame);

impl HttpFrameResponse {
    /// Get the status code of the frame.
    fn status_code(&self) -> StatusCode {
        match &self.0 {
            Frame::Anonymous(_) | Frame::Unit => StatusCode::OK,
            Frame::Message(MessageFrame { meta, .. }) => {
                match serde_json::from_slice::<HttpFrameMeta>(meta) {
                    Ok(http_meta) => {
                        StatusCode::from_u16(http_meta.status).unwrap_or(StatusCode::OK)
                    }
                    Err(_) => StatusCode::OK,
                }
            }
            Frame::Error(_) => StatusCode::INTERNAL_SERVER_ERROR,
        }
    }

    /// Get the body of the frame.
    fn body(&self) -> Bytes {
        self.0.clone().into_bytes()
    }

    /// Become a plain response.
    pub fn into_plain_response(self) -> impl IntoResponse {
        PlainHttpFrameResponse(self)
    }

    /// Become a JSON response.
    pub fn into_json_response(self) -> impl IntoResponse {
        JsonHttpFrameResponse(self)
    }
}

impl From<HttpFrameResponse> for Frame {
    fn from(frame: HttpFrameResponse) -> Self {
        frame.0
    }
}

impl From<Frame> for HttpFrameResponse {
    fn from(frame: Frame) -> Self {
        Self(frame)
    }
}

/// An intrepid frame being turned into an axum json response.
#[derive(Debug)]
pub struct PlainHttpFrameResponse(HttpFrameResponse);

impl IntoResponse for PlainHttpFrameResponse {
    fn into_response(self) -> Response<Body> {
        (self.0.status_code(), self.0.body()).into_response()
    }
}

/// An intrepid frame being turned into an axum response.
#[derive(Debug)]
pub struct JsonHttpFrameResponse(HttpFrameResponse);

impl IntoResponse for JsonHttpFrameResponse {
    fn into_response(self) -> Response<Body> {
        use axum::Json;
        let body = self.0.body();
        let body = if body.is_empty() {
            return (self.0.status_code(), Json(serde_json::Value::Null)).into_response();
        } else {
            body
        };

        let value = match serde_json::from_slice::<serde_json::Value>(&body) {
            Ok(value) => value,
            Err(error) => {
                return (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    Json(serde_json::json!({ "error": format!("Failed to parse response: {error}") })),
                )
                    .into_response();
            }
        };

        (self.0.status_code(), Json(value)).into_response()
    }
}

/// An intrepid error being turned into an axum response.
#[derive(Debug)]
pub struct HttpFrameResponseError(Error);

impl From<Error> for HttpFrameResponseError {
    fn from(error: Error) -> Self {
        Self(error)
    }
}

impl IntoResponse for HttpFrameResponseError {
    fn into_response(self) -> Response<Body> {
        (StatusCode::INTERNAL_SERVER_ERROR, self.0.to_string()).into_response()
    }
}

/// Metadata for a HTTP frame built from an axum request.
#[derive(Clone, Debug, serde::Deserialize, serde::Serialize, PartialEq, Eq)]
pub struct HttpFrameMeta {
    /// The HTTP status code.
    #[serde(default = "default_status")]
    pub status: u16,
    /// The HTTP method.
    #[serde(default = "default_method")]
    pub method: String,
    /// Any additional details, like headers
    #[serde(flatten)]
    pub details: HashMap<String, String>,
}

fn default_status() -> u16 {
    200
}

fn default_method() -> String {
    "GET".to_string()
}

impl Default for HttpFrameMeta {
    fn default() -> Self {
        Self {
            status: 200,
            method: default_method(),
            details: HashMap::new(),
        }
    }
}

/// An HTTP frame built from an axum request.
#[derive(Default, Debug)]
pub struct HttpRequestFrame {
    uri: String,
    meta: HttpFrameMeta,
    body: Body,
}

impl HttpRequestFrame {
    /// Turn the HTTP frame into an intrepid frame.
    pub async fn into_frame(self) -> Frame {
        let meta = serde_json::to_vec(&self.meta).unwrap();
        let body = to_bytes(self.body, usize::MAX).await.unwrap();

        Frame::message(self.uri, body, meta)
    }
}

impl From<Request<Body>> for HttpRequestFrame {
    fn from(request: Request<Body>) -> Self {
        let (parts, body) = request.into_parts();
        let mut http_frame = Self {
            body,
            uri: parts.uri.to_string(),
            ..Default::default()
        };

        http_frame.meta.method = parts.method.to_string();
        http_frame.meta.details = parts
            .headers
            .iter()
            .map(|(key, value)| (key.to_string(), value.to_str().unwrap().to_string()))
            .collect();

        http_frame
    }
}

// fn wat() -> BoxCloneService<Request<Body>, Response<Body>, Infallible> {
//     use std::{iter::once, sync::Arc};
//     use tower::ServiceBuilder;
//     use tower_http::{
//         add_extension::AddExtensionLayer, compression::CompressionLayer,
//         propagate_header::PropagateHeaderLayer, sensitive_headers::SetSensitiveRequestHeadersLayer,
//         trace::TraceLayer, validate_request::ValidateRequestHeaderLayer,
//     };
//     let service = ServiceBuilder::new()
//         .boxed_clone()
//         .layer(SetSensitiveRequestHeadersLayer::new(once(AUTHORIZATION)))
//         .layer(TraceLayer::new_for_http())
//         .layer(AddExtensionLayer::new(Arc::new(())))
//         .layer(CompressionLayer::new())
//         .layer(PropagateHeaderLayer::new(HeaderName::from_static(
//             "x-request-id",
//         )))
//         .layer(ValidateRequestHeaderLayer::bearer("passwordlol"))
//         .layer(ValidateRequestHeaderLayer::accept("application/json"))
//         .service_fn(|_| async { Ok("hay gusy  lol".to_string().into_response()) });

//     service
// }

// mod wut {
//     use std::{convert::Infallible, iter::once, sync::Arc};

//     use axum::{
//         body::Body,
//         extract::Request,
//         response::{IntoResponse, Response},
//     };
//     use http::{
//         header::{AUTHORIZATION, CONTENT_TYPE},
//         HeaderName,
//     };
//     use tower::{util::BoxService, ServiceBuilder};
//     use tower_http::{
//         add_extension::AddExtensionLayer, compression::CompressionLayer,
//         propagate_header::PropagateHeaderLayer, sensitive_headers::SetSensitiveRequestHeadersLayer,
//         set_header::SetResponseHeaderLayer, trace::TraceLayer,
//         validate_request::ValidateRequestHeaderLayer,
//     };

//     fn wat() -> BoxService<Request, Response, Infallible> {
//         let service = ServiceBuilder::new()
//             .boxed()
//             // Mark the `Authorization` request header as sensitive so it doesn't show in logs
//             .layer(SetSensitiveRequestHeadersLayer::new(once(AUTHORIZATION)))
//             // High level logging of requests and responses
//             .layer(TraceLayer::new_for_http())
//             // Share an `Arc<State>` with all requests
//             .layer(AddExtensionLayer::new(Arc::new(())))
//             // Compress responses
//             .layer(CompressionLayer::new())
//             // Propagate `X-Request-Id`s from requests to responses
//             .layer(PropagateHeaderLayer::new(HeaderName::from_static(
//                 "x-request-id",
//             )))
//             // If the response has a known size set the `Content-Length` header
//             // Authorize requests using a token
//             .layer(ValidateRequestHeaderLayer::bearer("passwordlol"))
//             // Accept only application/json, application/* and */* in a request's ACCEPT header
//             .layer(ValidateRequestHeaderLayer::accept("application/json"))
//             // Wrap a `Service` in our middleware stack
//             .service_fn(|_| async { Ok("hay gusy  lol".to_string().into_response()) });

//         service
//     }
// }