91 lines
2.0 KiB
Rust
91 lines
2.0 KiB
Rust
// Copyright 2024, 2025 New Vector Ltd.
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// Copyright 2023, 2024 The Matrix.org Foundation C.I.C.
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//
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// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
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// Please see LICENSE files in the repository root for full details.
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use opentelemetry::{KeyValue, Value};
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use tower::{Layer, Service};
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/// A simple static key-value pair.
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#[derive(Clone, Debug)]
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pub struct KV<V>(pub &'static str, pub V);
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impl<V> From<KV<V>> for KeyValue
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where
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V: Into<Value>,
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{
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fn from(value: KV<V>) -> Self {
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Self::new(value.0, value.1.into())
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}
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}
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/// A wrapper around a function that can be used to generate a key-value pair,
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/// make or enrich spans.
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#[derive(Clone, Debug)]
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pub struct FnWrapper<F>(pub F);
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/// A no-op layer that has the request type bound.
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#[derive(Clone, Copy, Debug)]
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pub struct IdentityLayer<R> {
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_request: std::marker::PhantomData<R>,
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}
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impl<R> Default for IdentityLayer<R> {
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fn default() -> Self {
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Self {
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_request: std::marker::PhantomData,
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}
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}
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}
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/// A no-op service that has the request type bound.
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#[derive(Clone, Copy, Debug)]
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pub struct IdentityService<R, S> {
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_request: std::marker::PhantomData<R>,
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inner: S,
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}
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impl<R, S> Default for IdentityService<R, S>
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where
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S: Default,
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{
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fn default() -> Self {
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Self {
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_request: std::marker::PhantomData,
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inner: S::default(),
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}
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}
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}
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impl<R, S> Layer<S> for IdentityLayer<R> {
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type Service = IdentityService<R, S>;
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fn layer(&self, inner: S) -> Self::Service {
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IdentityService {
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_request: std::marker::PhantomData,
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inner,
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}
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}
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}
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impl<S, R> Service<R> for IdentityService<R, S>
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where
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S: Service<R>,
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{
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type Response = S::Response;
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type Error = S::Error;
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type Future = S::Future;
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fn poll_ready(
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&mut self,
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cx: &mut std::task::Context<'_>,
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) -> std::task::Poll<Result<(), Self::Error>> {
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self.inner.poll_ready(cx)
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}
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fn call(&mut self, req: R) -> Self::Future {
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self.inner.call(req)
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}
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}
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