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use core::future::Future;
use std::convert::Infallible;
use std::pin::Pin;
pub use lambda_http;
pub use warp;
use lambda_http::http::response::Parts;
use lambda_http::http::HeaderValue;
use lambda_http::{
lambda_runtime, Adapter, Body as LambdaBody, Error as LambdaError, Request, RequestExt,
Response, Service,
};
use mime::Mime;
use once_cell::sync::Lazy;
use std::collections::HashSet;
use std::marker::PhantomData;
use std::str::FromStr;
use std::task::{Context, Poll};
use warp::hyper::Body as WarpBody;
pub type WarpRequest = warp::http::Request<warp::hyper::Body>;
pub type WarpResponse = warp::http::Response<warp::hyper::Body>;
#[derive(thiserror::Error, Debug)]
pub enum WarpAdapterError {
#[error("This may never occur, it's infallible!!")]
Infallible(#[from] std::convert::Infallible),
#[error("Warp error: `{0:#?}`")]
HyperError(#[from] warp::hyper::Error),
#[error("Unexpected error: `{0:#?}`")]
Unexpected(#[from] LambdaError),
}
pub async fn run<'a, S>(service: S) -> Result<(), LambdaError>
where
S: Service<WarpRequest, Response = WarpResponse, Error = Infallible> + Send + 'a,
S::Future: Send + 'a,
{
lambda_runtime::run(Adapter::from(WarpAdapter::new(service))).await
}
#[derive(Clone)]
pub struct WarpAdapter<'a, S>
where
S: Service<WarpRequest, Response = WarpResponse, Error = Infallible>,
S::Future: Send + 'a,
{
warp_service: S,
_phantom_data: PhantomData<&'a WarpResponse>,
}
impl<'a, S> WarpAdapter<'a, S>
where
S: Service<WarpRequest, Response = WarpResponse, Error = Infallible>,
S::Future: Send + 'a,
{
pub fn new(warp_service: S) -> Self {
Self {
warp_service,
_phantom_data: PhantomData,
}
}
}
static PLAINTEXT_MIMES: Lazy<HashSet<Mime>> = Lazy::new(|| {
vec![
mime::APPLICATION_JAVASCRIPT,
mime::APPLICATION_JAVASCRIPT_UTF_8,
mime::APPLICATION_JSON,
]
.into_iter()
.collect()
});
async fn warp_body_as_lambda_body(
warp_body: WarpBody,
parts: &Parts,
) -> Result<LambdaBody, LambdaError> {
let raw_bytes = warp::hyper::body::to_bytes(warp_body).await?;
let content_type: Option<&HeaderValue> = parts.headers.get("Content-Type");
let content_encoding: Option<&HeaderValue> = parts.headers.get("Content-Encoding");
let body = if let (Some(typ), None) = (content_type, content_encoding) {
let typ = typ.to_str()?;
let m = typ.parse::<Mime>()?;
if PLAINTEXT_MIMES.contains(&m) || m.type_() == mime::TEXT {
Some(String::from_utf8(raw_bytes.to_vec()).map(LambdaBody::Text)?)
} else {
None
}
} else {
None
};
Ok(body.unwrap_or_else(|| LambdaBody::Binary(raw_bytes.to_vec())))
}
impl<'a, S> Service<Request> for WarpAdapter<'a, S>
where
S: Service<WarpRequest, Response = WarpResponse, Error = Infallible> + 'a,
S::Future: Send + 'a,
{
type Response = Response<LambdaBody>;
type Error = LambdaError;
type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>> + Send + 'a>>;
fn poll_ready(&mut self, _: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
core::task::Poll::Ready(Ok(()))
}
fn call(&mut self, req: Request) -> Self::Future {
let query_params = req.query_string_parameters();
let (mut parts, body) = req.into_parts();
let body = match body {
LambdaBody::Empty => WarpBody::empty(),
LambdaBody::Text(t) => WarpBody::from(t.into_bytes()),
LambdaBody::Binary(b) => WarpBody::from(b),
};
let mut uri = format!("http://{}{}", "127.0.0.1", parts.uri.path());
if !query_params.is_empty() {
append_querystring_from_map(&mut uri, query_params.iter());
}
parts.uri = warp::hyper::Uri::from_str(uri.as_str())
.map_err(|e| e)
.unwrap();
let warp_request = WarpRequest::from_parts(parts, body);
let warp_fut = self.warp_service.call(warp_request);
let fut = async move {
let warp_response = warp_fut.await?;
let (parts, res_body): (_, _) = warp_response.into_parts();
let body = warp_body_as_lambda_body(res_body, &parts).await?;
let lambda_response = Response::from_parts(parts, body);
Ok::<Self::Response, Self::Error>(lambda_response)
};
Box::pin(fut)
}
}
fn append_querystring_from_map<'a, I>(uri: &mut String, from_query_params: I)
where
I: Iterator<Item = (&'a str, &'a str)>,
{
uri.push('?');
let mut serializer = url::form_urlencoded::Serializer::new(String::new());
for (key, value) in from_query_params {
serializer.append_pair(key, value);
}
uri.push_str(serializer.finish().as_str())
}