tonic 0.14.9

/*
 *
 * Copyright 2025 gRPC authors.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 */

use crate::{Request, Response, Status, Streaming};
use std::future::Future;
use tokio_stream::Stream;
use tower_service::Service;

/// A specialization of tower_service::Service.
///
/// Existing tower_service::Service implementations with the correct form will
/// automatically implement `UnaryService`.
pub trait UnaryService<R> {
    /// Protobuf response message type
    type Response;

    /// Response future
    type Future: Future<Output = Result<Response<Self::Response>, Status>>;

    /// Call the service
    fn call(&mut self, request: Request<R>) -> Self::Future;
}

impl<T, M1, M2> UnaryService<M1> for T
where
    T: Service<Request<M1>, Response = Response<M2>, Error = crate::Status>,
{
    type Response = M2;
    type Future = T::Future;

    fn call(&mut self, request: Request<M1>) -> Self::Future {
        Service::call(self, request)
    }
}

/// A specialization of tower_service::Service.
///
/// Existing tower_service::Service implementations with the correct form will
/// automatically implement `ServerStreamingService`.
pub trait ServerStreamingService<R> {
    /// Protobuf response message type
    type Response;

    /// Stream of outbound response messages
    type ResponseStream: Stream<Item = Result<Self::Response, Status>>;

    /// Response future
    type Future: Future<Output = Result<Response<Self::ResponseStream>, Status>>;

    /// Call the service
    fn call(&mut self, request: Request<R>) -> Self::Future;
}

impl<T, S, M1, M2> ServerStreamingService<M1> for T
where
    T: Service<Request<M1>, Response = Response<S>, Error = crate::Status>,
    S: Stream<Item = Result<M2, crate::Status>>,
{
    type Response = M2;
    type ResponseStream = S;
    type Future = T::Future;

    fn call(&mut self, request: Request<M1>) -> Self::Future {
        Service::call(self, request)
    }
}

/// A specialization of tower_service::Service.
///
/// Existing tower_service::Service implementations with the correct form will
/// automatically implement `ClientStreamingService`.
pub trait ClientStreamingService<R> {
    /// Protobuf response message type
    type Response;

    /// Response future
    type Future: Future<Output = Result<Response<Self::Response>, Status>>;

    /// Call the service
    fn call(&mut self, request: Request<Streaming<R>>) -> Self::Future;
}

impl<T, M1, M2> ClientStreamingService<M1> for T
where
    T: Service<Request<Streaming<M1>>, Response = Response<M2>, Error = crate::Status>,
{
    type Response = M2;
    type Future = T::Future;

    fn call(&mut self, request: Request<Streaming<M1>>) -> Self::Future {
        Service::call(self, request)
    }
}

/// A specialization of tower_service::Service.
///
/// Existing tower_service::Service implementations with the correct form will
/// automatically implement `StreamingService`.
pub trait StreamingService<R> {
    /// Protobuf response message type
    type Response;

    /// Stream of outbound response messages
    type ResponseStream: Stream<Item = Result<Self::Response, Status>>;

    /// Response future
    type Future: Future<Output = Result<Response<Self::ResponseStream>, Status>>;

    /// Call the service
    fn call(&mut self, request: Request<Streaming<R>>) -> Self::Future;
}

impl<T, S, M1, M2> StreamingService<M1> for T
where
    T: Service<Request<Streaming<M1>>, Response = Response<S>, Error = crate::Status>,
    S: Stream<Item = Result<M2, crate::Status>>,
{
    type Response = M2;
    type ResponseStream = S;
    type Future = T::Future;

    fn call(&mut self, request: Request<Streaming<M1>>) -> Self::Future {
        Service::call(self, request)
    }
}