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Diffstat (limited to 'ipfs-api-backend-hyper/src/backend.rs')
-rw-r--r-- | ipfs-api-backend-hyper/src/backend.rs | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/ipfs-api-backend-hyper/src/backend.rs b/ipfs-api-backend-hyper/src/backend.rs new file mode 100644 index 0000000..6ef9f7d --- /dev/null +++ b/ipfs-api-backend-hyper/src/backend.rs @@ -0,0 +1,166 @@ +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).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(res: &Self::HttpResponse, key: HeaderName) -> Option<&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) + } +} |