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use crate::error::Error;
use async_trait::async_trait;
use bytes::Bytes;
// Copyright 2021 rust-ipfs-api Developers
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
//
use futures::{FutureExt, Stream, StreamExt, TryFutureExt, TryStreamExt};
use http::{
header::{HeaderName, HeaderValue},
uri::Scheme,
StatusCode, Uri,
};
use hyper::{
body,
client::{self, connect::Connect, Builder, HttpConnector},
};
use ipfs_api_prelude::{ApiRequest, Backend, TryFromUri};
use multipart::client::multipart;
use serde::Serialize;
pub struct HyperBackend<C = HttpConnector>
where
C: Connect + Clone + Send + Sync + 'static,
{
base: Uri,
client: client::Client<C, hyper::Body>,
}
macro_rules! impl_default {
($http_connector:path) => {
impl_default!($http_connector, <$http_connector>::new());
};
($http_connector:path, $constructor:expr) => {
impl Default for HyperBackend<$http_connector> {
/// Creates an `IpfsClient` connected to the endpoint specified in ~/.ipfs/api.
/// If not found, tries to connect to `localhost:5001`.
///
fn default() -> Self {
Self::from_ipfs_config().unwrap_or_else(|| {
Self::from_host_and_port(Scheme::HTTP, "localhost", 5001).unwrap()
})
}
}
impl TryFromUri for HyperBackend<$http_connector> {
fn build_with_base_uri(base: Uri) -> Self {
let client = Builder::default()
.pool_max_idle_per_host(0)
.build($constructor);
HyperBackend { base, client }
}
}
};
}
impl_default!(HttpConnector);
#[cfg(feature = "with-hyper-tls")]
impl_default!(hyper_tls::HttpsConnector<HttpConnector>);
#[cfg(feature = "with-hyper-rustls")]
impl_default!(
hyper_rustls::HttpsConnector<HttpConnector>,
hyper_rustls::HttpsConnector::with_native_roots()
);
#[async_trait(?Send)]
impl<C> Backend for HyperBackend<C>
where
C: Connect + Clone + Send + Sync + 'static,
{
type HttpRequest = http::Request<hyper::Body>;
type HttpResponse = http::Response<hyper::Body>;
type Error = Error;
fn build_base_request<Req>(
&self,
req: &Req,
form: Option<multipart::Form<'static>>,
) -> Result<Self::HttpRequest, Error>
where
Req: ApiRequest,
{
let url = req.absolute_url(&self.base)?;
let builder = http::Request::builder();
let builder = builder.method(Req::METHOD.clone()).uri(url);
let req = if let Some(form) = form {
form.set_body_convert::<hyper::Body, multipart::Body>(builder)
} else {
builder.body(hyper::Body::empty())
}?;
Ok(req)
}
fn get_header<'a>(res: &'a Self::HttpResponse, key: HeaderName) -> Option<&'a HeaderValue> {
res.headers().get(key)
}
async fn request_raw<Req>(
&self,
req: Req,
form: Option<multipart::Form<'static>>,
) -> Result<(StatusCode, Bytes), Self::Error>
where
Req: ApiRequest + Serialize,
{
let req = self.build_base_request(&req, form)?;
let res = self.client.request(req).await?;
let status = res.status();
let body = body::to_bytes(res.into_body()).await?;
Ok((status, body))
}
fn response_to_byte_stream(
res: Self::HttpResponse,
) -> Box<dyn Stream<Item = Result<Bytes, Self::Error>> + Unpin> {
Box::new(res.into_body().err_into())
}
fn request_stream<Res, F, OutStream>(
&self,
req: Self::HttpRequest,
process: F,
) -> Box<dyn Stream<Item = Result<Res, Self::Error>> + Unpin>
where
OutStream: Stream<Item = Result<Res, Self::Error>> + Unpin,
F: 'static + Fn(Self::HttpResponse) -> OutStream,
{
let stream = self
.client
.request(req)
.err_into()
.map_ok(move |res| {
match res.status() {
StatusCode::OK => process(res).right_stream(),
// If the server responded with an error status code, the body
// still needs to be read so an error can be built. This block will
// read the entire body stream, then immediately return an error.
//
_ => body::to_bytes(res.into_body())
.boxed()
.map(|maybe_body| match maybe_body {
Ok(body) => Err(Self::process_error_from_body(body)),
Err(e) => Err(e.into()),
})
.into_stream()
.left_stream(),
}
})
.try_flatten_stream();
Box::new(stream)
}
}
|
