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// 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 crate::error::Error;
use async_trait::async_trait;
use awc::Client;
use bytes::Bytes;
use futures::{FutureExt, Stream, StreamExt, TryFutureExt, TryStreamExt};
use http::{
header::{HeaderName, HeaderValue},
uri::Scheme,
StatusCode, Uri,
};
use ipfs_api_prelude::{ApiRequest, Backend, TryFromUri};
use multipart::client::multipart;
use serde::Serialize;
use std::time::Duration;
const ACTIX_REQUEST_TIMEOUT: Duration = Duration::from_secs(90);
pub struct ActixBackend {
base: Uri,
client: Client,
}
impl Default for ActixBackend {
/// 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 ActixBackend {
fn build_with_base_uri(base: Uri) -> Self {
let client = Client::default();
ActixBackend { base, client }
}
}
#[async_trait(?Send)]
impl Backend for ActixBackend {
type HttpRequest = awc::SendClientRequest;
type HttpResponse = awc::ClientResponse<
actix_http::encoding::Decoder<actix_http::Payload<actix_http::PayloadStream>>,
>;
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 req = self.client.request(Req::METHOD, url);
let req = if let Some(form) = form {
req.content_type(form.content_type())
.send_body(multipart::Body::from(form))
} else {
req.timeout(ACTIX_REQUEST_TIMEOUT).send()
};
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 mut res = req.await?;
let status = res.status();
let body = res.body().await?;
// FIXME: Actix compat with bytes 1.0
Ok((status, body))
}
fn response_to_byte_stream(
res: Self::HttpResponse,
) -> Box<dyn Stream<Item = Result<Bytes, Self::Error>> + Unpin> {
let stream = res.err_into();
Box::new(stream)
}
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 = req
.err_into()
.map_ok(move |mut 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.
//
_ => res
.body()
.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)
}
}
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