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use std::future::Future;
use futures::future::BoxFuture;
use futures::FutureExt;
use hyper::body::Buf;
use hyper::header::HeaderValue;
use hyper::http::request::Parts as RequestParts;
use hyper::http::response::Parts as ResponseParts;
use hyper::http::Error as HttpError;
use hyper::server::conn::AddrIncoming;
use hyper::server::{Builder, Server};
use hyper::{Body, HeaderMap, Request, Response, StatusCode};
use lazy_static::lazy_static;
use serde_json::{Map, Value};
use url::Host;
use yajrc::{AnyRpcMethod, GenericRpcMethod, Id, RpcError, RpcRequest, RpcResponse};
use crate::{Context, Metadata};
lazy_static! {
#[cfg(feature = "cbor")]
static ref CBOR_INTERNAL_ERROR: Vec<u8> =
serde_cbor::to_vec(&RpcResponse::<AnyRpcMethod<'static>>::from(yajrc::INTERNAL_ERROR)).unwrap();
static ref JSON_INTERNAL_ERROR: Vec<u8> =
serde_json::to_vec(&RpcResponse::<AnyRpcMethod<'static>>::from(yajrc::INTERNAL_ERROR)).unwrap();
}
pub fn make_builder<Ctx: Context>(ctx: &Ctx) -> Builder<AddrIncoming> {
let addr = match ctx.host() {
Host::Ipv4(ip) => (ip, ctx.port()).into(),
Host::Ipv6(ip) => (ip, ctx.port()).into(),
Host::Domain(localhost) if localhost == "localhost" => ([127, 0, 0, 1], ctx.port()).into(),
_ => ([0, 0, 0, 0], ctx.port()).into(),
};
Server::bind(&addr)
}
pub async fn make_request(
req_parts: &RequestParts,
req_body: Body,
) -> Result<RpcRequest<GenericRpcMethod<String, Map<String, Value>>>, RpcError> {
let body = hyper::body::aggregate(req_body).await?.reader();
let rpc_req: RpcRequest<GenericRpcMethod<String, Map<String, Value>>>;
#[cfg(feature = "cbor")]
if req_parts
.headers
.get("content-type")
.and_then(|h| h.to_str().ok())
== Some("application/cbor")
{
rpc_req = serde_cbor::from_reader(body)?;
} else {
rpc_req = serde_json::from_reader(body)?;
}
#[cfg(not(feature = "cbor"))]
{
rpc_req = serde_json::from_reader(body)?;
}
Ok(rpc_req)
}
pub fn to_response<F: Fn(i32) -> StatusCode>(
req_headers: &HeaderMap<HeaderValue>,
mut res_parts: ResponseParts,
res: Result<(Option<Id>, Result<Value, RpcError>), RpcError>,
status_code_fn: F,
) -> Result<Response<Body>, HttpError> {
let rpc_res: RpcResponse = match res {
Ok((id, result)) => RpcResponse { id, result },
Err(e) => e.into(),
};
let body;
#[cfg(feature = "cbor")]
if req_headers
.get("accept")
.and_then(|h| h.to_str().ok())
.iter()
.flat_map(|s| s.split(","))
.map(|s| s.trim())
.any(|s| s == "application/cbor")
{
res_parts
.headers
.insert("content-type", HeaderValue::from_static("application/cbor"));
body = serde_cbor::to_vec(&rpc_res).unwrap_or_else(|_| CBOR_INTERNAL_ERROR.clone());
} else {
res_parts
.headers
.insert("content-type", HeaderValue::from_static("application/json"));
body = serde_json::to_vec(&rpc_res).unwrap_or_else(|_| JSON_INTERNAL_ERROR.clone());
}
#[cfg(not(feature = "cbor"))]
{
res_parts
.headers
.insert("content-type", HeaderValue::from_static("application/json"));
body = serde_json::to_vec(&rpc_res).unwrap_or_else(|_| JSON_INTERNAL_ERROR.clone());
}
res_parts.headers.insert(
"content-length",
HeaderValue::from_str(&format!("{}", body.len()))?,
);
res_parts.status = match &rpc_res.result {
Ok(_) => StatusCode::OK,
Err(e) => status_code_fn(e.code),
};
Ok(Response::from_parts(res_parts, body.into()))
}
pub type DynMiddleware<Metadata> = Box<
dyn for<'a> Fn(
&'a mut Request<Body>,
Metadata,
)
-> BoxFuture<'a, Result<Result<DynMiddlewareStage2, Response<Body>>, HttpError>>
+ Send
+ Sync,
>;
pub fn noop<M: Metadata>() -> DynMiddleware<M> {
Box::new(|_, _| async { Ok(Ok(noop2())) }.boxed())
}
pub type DynMiddlewareStage2 = Box<
dyn for<'a> FnOnce(
&'a mut RequestParts,
&'a mut RpcRequest<GenericRpcMethod<String, Map<String, Value>>>,
) -> BoxFuture<
'a,
Result<Result<DynMiddlewareStage3, Response<Body>>, HttpError>,
> + Send
+ Sync,
>;
pub fn noop2() -> DynMiddlewareStage2 {
Box::new(|_, _| async { Ok(Ok(noop3())) }.boxed())
}
pub type DynMiddlewareStage3 = Box<
dyn for<'a> FnOnce(
&'a mut ResponseParts,
&'a mut Result<Value, RpcError>,
) -> BoxFuture<
'a,
Result<Result<DynMiddlewareStage4, Response<Body>>, HttpError>,
> + Send
+ Sync,
>;
pub fn noop3() -> DynMiddlewareStage3 {
Box::new(|_, _| async { Ok(Ok(noop4())) }.boxed())
}
pub type DynMiddlewareStage4 = Box<
dyn for<'a> FnOnce(&'a mut Response<Body>) -> BoxFuture<'a, Result<(), HttpError>>
+ Send
+ Sync,
>;
pub fn noop4() -> DynMiddlewareStage4 {
Box::new(|_| async { Ok(()) }.boxed())
}
pub fn constrain_middleware<
'a,
'b,
'c,
'd,
M: Metadata,
ReqFn: Fn(&'a mut Request<Body>, M) -> ReqFut + Clone,
ReqFut: Future<Output = Result<Result<RpcReqFn, Response<Body>>, HttpError>> + 'a,
RpcReqFn: FnOnce(
&'b mut RequestParts,
&'b mut RpcRequest<GenericRpcMethod<String, Map<String, Value>>>,
) -> RpcReqFut,
RpcReqFut: Future<Output = Result<Result<RpcResFn, Response<Body>>, HttpError>> + 'b,
RpcResFn: FnOnce(&'c mut ResponseParts, &'c mut Result<Value, RpcError>) -> RpcResFut,
RpcResFut: Future<Output = Result<Result<ResFn, Response<Body>>, HttpError>> + 'c,
ResFn: FnOnce(&'d mut Response<Body>) -> ResFut,
ResFut: Future<Output = Result<(), HttpError>> + 'd,
>(
f: ReqFn,
) -> ReqFn {
f
}
