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// Implementation note: hyper's API is not adapted to async/await at all, and there's
// unfortunately a lot of boilerplate here that could be removed once/if it gets reworked.
//
// Additionally, despite the fact that hyper is capable of performing requests to multiple different
// servers through the same `hyper::Client`, we don't use that feature on purpose. The reason is
// that we need to be guaranteed that hyper doesn't re-use an existing connection if we ever reset
// the JSON-RPC request id to a value that might have already been used.
use crate::error::GenericTransportError;
use hyper::client::{Client, HttpConnector};
use hyper_rustls::HttpsConnector;
use thiserror::Error;
const CONTENT_TYPE_JSON: &str = "application/json";
/// HTTP Transport Client.
#[derive(Debug, Clone)]
pub(crate) struct HttpTransportClient {
target: url::Url,
/// HTTP client
client: Client<HttpsConnector<HttpConnector>>,
}
impl HttpTransportClient {
/// Initializes a new HTTP client.
pub(crate) fn new(target: impl AsRef<str>, max_request_body_size: u32) -> Result<Self, Error> {
let target = url::Url::parse(target.as_ref()).map_err(|e| Error::Url(format!("Invalid URL: {}", e)))?;
if target.scheme() == "http" || target.scheme() == "https" {
#[cfg(feature = "tokio1")]
let connector = HttpsConnector::with_native_roots();
#[cfg(feature = "tokio02")]
let connector = HttpsConnector::new();
let client = Client::builder().build::<_, hyper::Body>(connector);
Ok(HttpTransportClient { target, client, max_request_body_size })
Err(Error::Url("URL scheme not supported, expects 'http' or 'https'".into()))
async fn inner_send(&self, body: String) -> Result<hyper::Response<hyper::Body>, Error> {
log::debug!("send: {}", body);
if body.len() > self.max_request_body_size as usize {
let req = hyper::Request::post(self.target.as_str())
.header(hyper::header::CONTENT_TYPE, hyper::header::HeaderValue::from_static(CONTENT_TYPE_JSON))
.header(hyper::header::ACCEPT, hyper::header::HeaderValue::from_static(CONTENT_TYPE_JSON))
.body(From::from(body))
.expect("URI and request headers are valid; qed");
let response = self.client.request(req).await.map_err(|e| Error::Http(Box::new(e)))?;
if response.status().is_success() {
Ok(response)
} else {
Err(Error::RequestFailure { status_code: response.status().into() })
}
}
/// Send serialized message and wait until all bytes from the HTTP message body is read.
pub(crate) async fn send_and_read_body(&self, body: String) -> Result<Vec<u8>, Error> {
let response = self.inner_send(body).await?;
let (parts, body) = response.into_parts();
let body = hyper_helpers::read_response_to_body(&parts.headers, body, self.max_request_body_size).await?;
/// Send serialized message without reading the HTTP message body.
pub(crate) async fn send(&self, body: String) -> Result<(), Error> {
let _ = self.inner_send(body).await?;
Ok(())
}
}
/// Error that can happen during a request.
#[derive(Debug, Error)]
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/// Invalid URL.
#[error("Invalid Url: {0}")]
Url(String),
/// Error during the HTTP request, including networking errors and HTTP protocol errors.
#[error("Error while performing the HTTP request")]
Http(Box<dyn std::error::Error + Send + Sync>),
/// Server returned a non-success status code.
#[error("Server returned an error status code: {:?}", status_code)]
RequestFailure {
/// Status code returned by the server.
status_code: u16,
},
/// Request body too large.
#[error("The request body was too large")]
RequestTooLarge,
}
impl<T> From<GenericTransportError<T>> for Error
where
T: std::error::Error + Send + Sync + 'static,
{
fn from(err: GenericTransportError<T>) -> Self {
match err {
GenericTransportError::<T>::TooLarge => Self::RequestTooLarge,
GenericTransportError::<T>::Inner(e) => Self::Http(Box::new(e)),
}
}
}
#[cfg(test)]
mod tests {
use super::{Error, HttpTransportClient};
#[test]
fn invalid_http_url_rejected() {
let err = HttpTransportClient::new("ws://localhost:9933", 80).unwrap_err();
assert!(matches!(err, Error::Url(_)));
}
#[tokio::test]
async fn request_limit_works() {
let eighty_bytes_limit = 80;
let client = HttpTransportClient::new("http://localhost:9933", 80).unwrap();
assert_eq!(client.max_request_body_size, eighty_bytes_limit);
let body = "a".repeat(81);
assert_eq!(body.len(), 81);
let response = client.send(body).await.unwrap_err();
assert!(matches!(response, Error::RequestTooLarge));
}
}