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// Copyright 2023 The RocketMQ Rust Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! Runtime components for remoting operations.
//!
//! This module provides the core abstractions and configuration for handling
//! RPC requests, including hooks, processors, and connection management.
use std::net::SocketAddr;
use std::sync::Arc;
use rocketmq_protocol::protocol::remoting_command::RemotingCommand;
pub mod config;
pub(crate) mod processor;
/// Defines hooks for intercepting RPC requests and responses.
///
/// Implementors can execute custom logic before requests are processed and after
/// responses are generated. This enables authentication, logging, metrics collection,
/// and other cross-cutting concerns.
///
/// Implementations must be thread-safe and have a static lifetime.
pub trait RPCHook: Send + Sync + 'static {
/// Invoked before processing an RPC request.
///
/// The request may be modified before processing. The remote address identifies
/// the caller.
///
/// # Errors
///
/// Returns an error if the request should not be processed.
fn do_before_request(
&self,
remote_addr: SocketAddr,
request: &mut RemotingCommand,
) -> Result<(), rocketmq_error::SharedError>;
/// Invoked after generating an RPC response.
///
/// The response may be modified before being sent to the caller. Both the
/// original request and the remote address are provided for context.
///
/// # Errors
///
/// Returns an error if post-processing fails.
fn do_after_response(
&self,
remote_addr: SocketAddr,
request: &RemotingCommand,
response: &mut RemotingCommand,
) -> Result<(), rocketmq_error::SharedError>;
}
/// Thread-safe, reference-counted RPC hook.
pub type RPCHookArc = Arc<dyn RPCHook>;