jsonrpsee_server/middleware/rpc/layer/
either.rs

1// Copyright 2019-2021 Parity Technologies (UK) Ltd.
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26
27//! [`tower::util::Either`] but
28//! adjusted to satisfy the trait bound [`RpcServiceT].
29//!
30//! NOTE: This is introduced because it doesn't
31//! work to implement tower::Layer for
32//! external types such as future::Either.
33
34use crate::middleware::rpc::RpcServiceT;
35use jsonrpsee_types::Request;
36
37/// [`tower::util::Either`] but
38/// adjusted to satisfy the trait bound [`RpcServiceT].
39#[derive(Clone, Debug)]
40pub enum Either<A, B> {
41	/// One type of backing [`RpcServiceT`].
42	Left(A),
43	/// The other type of backing [`RpcServiceT`].
44	Right(B),
45}
46
47impl<S, A, B> tower::Layer<S> for Either<A, B>
48where
49	A: tower::Layer<S>,
50	B: tower::Layer<S>,
51{
52	type Service = Either<A::Service, B::Service>;
53
54	fn layer(&self, inner: S) -> Self::Service {
55		match self {
56			Either::Left(layer) => Either::Left(layer.layer(inner)),
57			Either::Right(layer) => Either::Right(layer.layer(inner)),
58		}
59	}
60}
61
62impl<'a, A, B> RpcServiceT<'a> for Either<A, B>
63where
64	A: RpcServiceT<'a> + Send + 'a,
65	B: RpcServiceT<'a> + Send + 'a,
66{
67	type Future = futures_util::future::Either<A::Future, B::Future>;
68
69	fn call(&self, request: Request<'a>) -> Self::Future {
70		match self {
71			Either::Left(service) => futures_util::future::Either::Left(service.call(request)),
72			Either::Right(service) => futures_util::future::Either::Right(service.call(request)),
73		}
74	}
75}
jsonrpsee_server/middleware/rpc/layer/either.rs

jsonrpsee_server/middleware/rpc/layer/
either.rs
