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refactor: we can use tonic-reflection instead of having to generate the reflection client ourselfs (#29)

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This pull request removes the custom-generated gRPC reflection protocol code from the repository and switches to using the `tonic-reflection` crate’s built-in protocol definitions. It also cleans up related tooling and dependencies that are no longer needed.

### Migration to `tonic-reflection` for gRPC reflection

* Replaced internal generated protocol types in `granc-core/src/reflection/client.rs` with imports from `tonic_reflection::pb::v1`, removing the need for the local `generated` module. [[1]](diffhunk://#diff-13deee04dd97de938cc46f0ef4faca083f3b471800e94cf45937122b83f01d57L19-L23) [[2]](diffhunk://#diff-13deee04dd97de938cc46f0ef4faca083f3b471800e94cf45937122b83f01d57R29-R33)
* Deleted the `granc-core/src/reflection/generated.rs` module, which previously contained the generated Rust code for the reflection protocol.
* Removed the reflection proto file (`granc-tools/proto/reflection.proto`) and the `granc-tools` crate, including its build tooling and dependencies, as they are no longer needed. [[1]](diffhunk://#diff-152ff715d002656dc972a294d86490c4857848392f54c73ac7e8818191ca617dL1-L149) [[2]](diffhunk://#diff-8a8fd674fd23e14d5c7a1ab242678a860560b0eee27cd248254510a3d585cbb4L1-L15) [[3]](diffhunk://#diff-2e9d962a08321605940b5a657135052fbcef87b5e360662bb527c96d9a615542L2-R2) [[4]](diffhunk://#diff-9375fd04332c86472d7be397ef09428cb86babd8826880a5835bd1d1c1bdbc08L43-L53)

### Dependency and configuration cleanup

* Updated `granc-core/Cargo.toml` to add `tonic-reflection` as a regular dependency (not just a dev-dependency) and removed the now-unnecessary dev-dependency.

### Codebase simplification

* Removed the now-unused `mod generated;` declaration from `granc-core/src/reflection.rs`.
This commit is contained in:
Víctor Martínez 2026-01-27 02:26:10 +01:00 committed by GitHub
parent 772b3a45b9
commit 17e6fe57a0
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GPG key ID: B5690EEEBB952194
11 changed files with 7 additions and 501 deletions
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7
Cargo.lock generated
View file

@ -346,13 +346,6 @@ dependencies = [
"tonic",
]
[[package]]
name = "granc-tools"
version = "0.0.0"
dependencies = [
"tonic-prost-build",
]
[[package]]
name = "granc_core"
version = "0.4.0"

2
Cargo.toml
View file

@ -1,5 +1,5 @@
[workspace]
members = ["granc", "granc-core", "granc-tools", "echo-service"]
members = ["granc", "granc-core", "echo-service"]
resolver = "2"
[workspace.package]

11
Makefile.toml
View file

@ -40,14 +40,3 @@ args = [
"-D",
"warnings",
]
[tasks.generate-reflection-service]
description = "Runs a binary that generates a reflection service client from the reflection proto definitions"
command = "cargo"
args = [
"run",
"--bin",
"generate-reflection-service",
"--features",
"gen-proto",
]

2
granc-core/Cargo.toml
View file

@ -30,8 +30,8 @@ tokio = { workspace = true, features = ["sync"] }
tokio-stream = "0.1.18"
tonic = { workspace = true }
tonic-prost = { workspace = true }
tonic-reflection = { workspace = true }
[dev-dependencies]
echo-service = { path = "../echo-service" }
tokio = { workspace = true, features = ["rt-multi-thread", "macros"] }
tonic-reflection = { workspace = true }

1
granc-core/src/reflection.rs
View file

@ -5,4 +5,3 @@
//! It enables the client to query a server for its own Protobuf schema at runtime, allowing
//! `granc` to function without pre-compiled descriptors.
pub mod client;
mod generated;

10
granc-core/src/reflection/client.rs
View file

@ -16,11 +16,6 @@
//! ## References
//!
//! * [gRPC Server Reflection Protocol](https://github.com/grpc/grpc/blob/master/doc/server-reflection.md)
use super::generated::reflection_v1::{
ServerReflectionRequest, ServerReflectionResponse,
server_reflection_client::ServerReflectionClient, server_reflection_request::MessageRequest,
server_reflection_response::MessageResponse,
};
use crate::BoxError;
use futures_util::stream::once;
use http_body::Body as HttpBody;
@ -31,6 +26,11 @@ use tokio::sync::mpsc;
use tokio_stream::wrappers::ReceiverStream;
use tonic::transport::Channel;
use tonic::{Streaming, client::GrpcService};
use tonic_reflection::pb::v1::{
ServerReflectionRequest, ServerReflectionResponse,
server_reflection_client::ServerReflectionClient, server_reflection_request::MessageRequest,
server_reflection_response::MessageResponse,
};
/// Errors that can occur during reflection resolution.
#[derive(Debug, thiserror::Error)]

11
granc-core/src/reflection/generated.rs
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@ -1,11 +0,0 @@
//! # Generated Reflection Types
//!
//! This module contains the Rust code generated by `tonic-build` from the `reflection.proto` file.
//! It defines the structs and traits required to communicate with standard gRPC reflection servers.
//!
//! *Note: This is strictly for internal use by the `ReflectionClient`.*
//!
#[path = "./generated/grpc.reflection.v1.rs"]
#[allow(clippy::enum_variant_names)]
#[rustfmt::skip]
pub mod reflection_v1;

272
granc-core/src/reflection/generated/grpc.reflection.v1.rs
View file

@ -1,272 +0,0 @@
// This file is @generated by prost-build.
/// The message sent by the client when calling ServerReflectionInfo method.
#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
pub struct ServerReflectionRequest {
#[prost(string, tag = "1")]
pub host: ::prost::alloc::string::String,
/// To use reflection service, the client should set one of the following
/// fields in message_request. The server distinguishes requests by their
/// defined field and then handles them using corresponding methods.
#[prost(oneof = "server_reflection_request::MessageRequest", tags = "3, 4, 5, 6, 7")]
pub message_request: ::core::option::Option<
server_reflection_request::MessageRequest,
>,
}
/// Nested message and enum types in `ServerReflectionRequest`.
pub mod server_reflection_request {
/// To use reflection service, the client should set one of the following
/// fields in message_request. The server distinguishes requests by their
/// defined field and then handles them using corresponding methods.
#[derive(Clone, PartialEq, Eq, Hash, ::prost::Oneof)]
pub enum MessageRequest {
/// Find a proto file by the file name.
#[prost(string, tag = "3")]
FileByFilename(::prost::alloc::string::String),
/// Find the proto file that declares the given fully-qualified symbol name.
/// This field should be a fully-qualified symbol name
/// (e.g. <package>.<service>\[.<method>\] or <package>.<type>).
#[prost(string, tag = "4")]
FileContainingSymbol(::prost::alloc::string::String),
/// Find the proto file which defines an extension extending the given
/// message type with the given field number.
#[prost(message, tag = "5")]
FileContainingExtension(super::ExtensionRequest),
/// Finds the tag numbers used by all known extensions of the given message
/// type, and appends them to ExtensionNumberResponse in an undefined order.
/// Its corresponding method is best-effort: it's not guaranteed that the
/// reflection service will implement this method, and it's not guaranteed
/// that this method will provide all extensions. Returns
/// StatusCode::UNIMPLEMENTED if it's not implemented.
/// This field should be a fully-qualified type name. The format is
/// <package>.<type>
#[prost(string, tag = "6")]
AllExtensionNumbersOfType(::prost::alloc::string::String),
/// List the full names of registered services. The content will not be
/// checked.
#[prost(string, tag = "7")]
ListServices(::prost::alloc::string::String),
}
}
/// The type name and extension number sent by the client when requesting
/// file_containing_extension.
#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
pub struct ExtensionRequest {
/// Fully-qualified type name. The format should be <package>.<type>
#[prost(string, tag = "1")]
pub containing_type: ::prost::alloc::string::String,
#[prost(int32, tag = "2")]
pub extension_number: i32,
}
/// The message sent by the server to answer ServerReflectionInfo method.
#[derive(Clone, PartialEq, ::prost::Message)]
pub struct ServerReflectionResponse {
#[prost(string, tag = "1")]
pub valid_host: ::prost::alloc::string::String,
#[prost(message, optional, tag = "2")]
pub original_request: ::core::option::Option<ServerReflectionRequest>,
/// The server sets one of the following fields according to the message_request
/// in the request.
#[prost(oneof = "server_reflection_response::MessageResponse", tags = "4, 5, 6, 7")]
pub message_response: ::core::option::Option<
server_reflection_response::MessageResponse,
>,
}
/// Nested message and enum types in `ServerReflectionResponse`.
pub mod server_reflection_response {
/// The server sets one of the following fields according to the message_request
/// in the request.
#[derive(Clone, PartialEq, ::prost::Oneof)]
pub enum MessageResponse {
/// This message is used to answer file_by_filename, file_containing_symbol,
/// file_containing_extension requests with transitive dependencies.
/// As the repeated label is not allowed in oneof fields, we use a
/// FileDescriptorResponse message to encapsulate the repeated fields.
/// The reflection service is allowed to avoid sending FileDescriptorProtos
/// that were previously sent in response to earlier requests in the stream.
#[prost(message, tag = "4")]
FileDescriptorResponse(super::FileDescriptorResponse),
/// This message is used to answer all_extension_numbers_of_type requests.
#[prost(message, tag = "5")]
AllExtensionNumbersResponse(super::ExtensionNumberResponse),
/// This message is used to answer list_services requests.
#[prost(message, tag = "6")]
ListServicesResponse(super::ListServiceResponse),
/// This message is used when an error occurs.
#[prost(message, tag = "7")]
ErrorResponse(super::ErrorResponse),
}
}
/// Serialized FileDescriptorProto messages sent by the server answering
/// a file_by_filename, file_containing_symbol, or file_containing_extension
/// request.
#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
pub struct FileDescriptorResponse {
/// Serialized FileDescriptorProto messages. We avoid taking a dependency on
/// descriptor.proto, which uses proto2 only features, by making them opaque
/// bytes instead.
#[prost(bytes = "vec", repeated, tag = "1")]
pub file_descriptor_proto: ::prost::alloc::vec::Vec<::prost::alloc::vec::Vec<u8>>,
}
/// A list of extension numbers sent by the server answering
/// all_extension_numbers_of_type request.
#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
pub struct ExtensionNumberResponse {
/// Full name of the base type, including the package name. The format
/// is <package>.<type>
#[prost(string, tag = "1")]
pub base_type_name: ::prost::alloc::string::String,
#[prost(int32, repeated, tag = "2")]
pub extension_number: ::prost::alloc::vec::Vec<i32>,
}
/// A list of ServiceResponse sent by the server answering list_services request.
#[derive(Clone, PartialEq, ::prost::Message)]
pub struct ListServiceResponse {
/// The information of each service may be expanded in the future, so we use
/// ServiceResponse message to encapsulate it.
#[prost(message, repeated, tag = "1")]
pub service: ::prost::alloc::vec::Vec<ServiceResponse>,
}
/// The information of a single service used by ListServiceResponse to answer
/// list_services request.
#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
pub struct ServiceResponse {
/// Full name of a registered service, including its package name. The format
/// is <package>.<service>
#[prost(string, tag = "1")]
pub name: ::prost::alloc::string::String,
}
/// The error code and error message sent by the server when an error occurs.
#[derive(Clone, PartialEq, Eq, Hash, ::prost::Message)]
pub struct ErrorResponse {
/// This field uses the error codes defined in grpc::StatusCode.
#[prost(int32, tag = "1")]
pub error_code: i32,
#[prost(string, tag = "2")]
pub error_message: ::prost::alloc::string::String,
}
/// Generated client implementations.
pub mod server_reflection_client {
#![allow(
unused_variables,
dead_code,
missing_docs,
clippy::wildcard_imports,
clippy::let_unit_value,
)]
use tonic::codegen::*;
use tonic::codegen::http::Uri;
#[derive(Debug, Clone)]
pub struct ServerReflectionClient<T> {
inner: tonic::client::Grpc<T>,
}
impl ServerReflectionClient<tonic::transport::Channel> {
/// Attempt to create a new client by connecting to a given endpoint.
pub async fn connect<D>(dst: D) -> Result<Self, tonic::transport::Error>
where
D: TryInto<tonic::transport::Endpoint>,
D::Error: Into<StdError>,
{
let conn = tonic::transport::Endpoint::new(dst)?.connect().await?;
Ok(Self::new(conn))
}
}
impl<T> ServerReflectionClient<T>
where
T: tonic::client::GrpcService<tonic::body::Body>,
T::Error: Into<StdError>,
T::ResponseBody: Body<Data = Bytes> + std::marker::Send + 'static,
<T::ResponseBody as Body>::Error: Into<StdError> + std::marker::Send,
{
pub fn new(inner: T) -> Self {
let inner = tonic::client::Grpc::new(inner);
Self { inner }
}
pub fn with_origin(inner: T, origin: Uri) -> Self {
let inner = tonic::client::Grpc::with_origin(inner, origin);
Self { inner }
}
pub fn with_interceptor<F>(
inner: T,
interceptor: F,
) -> ServerReflectionClient<InterceptedService<T, F>>
where
F: tonic::service::Interceptor,
T::ResponseBody: Default,
T: tonic::codegen::Service<
http::Request<tonic::body::Body>,
Response = http::Response<
<T as tonic::client::GrpcService<tonic::body::Body>>::ResponseBody,
>,
>,
<T as tonic::codegen::Service<
http::Request<tonic::body::Body>,
>>::Error: Into<StdError> + std::marker::Send + std::marker::Sync,
{
ServerReflectionClient::new(InterceptedService::new(inner, interceptor))
}
/// Compress requests with the given encoding.
///
/// This requires the server to support it otherwise it might respond with an
/// error.
#[must_use]
pub fn send_compressed(mut self, encoding: CompressionEncoding) -> Self {
self.inner = self.inner.send_compressed(encoding);
self
}
/// Enable decompressing responses.
#[must_use]
pub fn accept_compressed(mut self, encoding: CompressionEncoding) -> Self {
self.inner = self.inner.accept_compressed(encoding);
self
}
/// Limits the maximum size of a decoded message.
///
/// Default: `4MB`
#[must_use]
pub fn max_decoding_message_size(mut self, limit: usize) -> Self {
self.inner = self.inner.max_decoding_message_size(limit);
self
}
/// Limits the maximum size of an encoded message.
///
/// Default: `usize::MAX`
#[must_use]
pub fn max_encoding_message_size(mut self, limit: usize) -> Self {
self.inner = self.inner.max_encoding_message_size(limit);
self
}
/// The reflection service is structured as a bidirectional stream, ensuring
/// all related requests go to a single server.
pub async fn server_reflection_info(
&mut self,
request: impl tonic::IntoStreamingRequest<
Message = super::ServerReflectionRequest,
>,
) -> std::result::Result<
tonic::Response<tonic::codec::Streaming<super::ServerReflectionResponse>>,
tonic::Status,
> {
self.inner
.ready()
.await
.map_err(|e| {
tonic::Status::unknown(
format!("Service was not ready: {}", e.into()),
)
})?;
let codec = tonic_prost::ProstCodec::default();
let path = http::uri::PathAndQuery::from_static(
"/grpc.reflection.v1.ServerReflection/ServerReflectionInfo",
);
let mut req = request.into_streaming_request();
req.extensions_mut()
.insert(
GrpcMethod::new(
"grpc.reflection.v1.ServerReflection",
"ServerReflectionInfo",
),
);
self.inner.streaming(req, path, codec).await
}
}
}

15
granc-tools/Cargo.toml
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@ -1,15 +0,0 @@
[package]
name = "granc-tools"
edition = { workspace = true }
publish = false
[features]
gen-proto = ["dep:tonic-prost-build"]
[[bin]]
name = "generate-reflection-service"
path = "bin/generate_reflection_service.rs"
required-features = ["gen-proto"]
[dependencies]
tonic-prost-build = { workspace = true, optional = true }

28
granc-tools/bin/generate_reflection_service.rs
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@ -1,28 +0,0 @@
use std::env;
use std::fs;
use std::path::PathBuf;
fn main() -> Result<(), Box<dyn std::error::Error>> {
println!("Generating Reflection Service types...");
let manifest_dir = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
let out_dir = manifest_dir.join("../granc-core/src/reflection/generated");
let proto_file = manifest_dir.join("proto/reflection.proto");
let proto_folder = manifest_dir.join("proto");
if !out_dir.exists() {
fs::create_dir_all(&out_dir)?;
}
tonic_prost_build::configure()
.build_server(false)
.build_client(true)
.out_dir(&out_dir)
.compile_protos(&[proto_file], &[proto_folder])
.unwrap();
println!("Done! Generated files are in src/reflection/generated");
Ok(())
}

149
granc-tools/proto/reflection.proto
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@ -1,149 +0,0 @@
// This file has been copied from the original gRPC Authors.
//
// The Apache License, Version 2.0 is used in this project and applies
// to this file too.
//
// I explicitly state that I haven't written this file and the copyright
// belongs completely to the original authors.
//
// Copyright 2016 The gRPC 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.
// Service exported by server reflection. A more complete description of how
// server reflection works can be found at
// https://github.com/grpc/grpc/blob/master/doc/server-reflection.md
//
// The canonical version of this proto can be found at
// https://github.com/grpc/grpc-proto/blob/master/grpc/reflection/v1/reflection.proto
syntax = "proto3";
package grpc.reflection.v1;
service ServerReflection {
// The reflection service is structured as a bidirectional stream, ensuring
// all related requests go to a single server.
rpc ServerReflectionInfo(stream ServerReflectionRequest)
returns (stream ServerReflectionResponse);
}
// The message sent by the client when calling ServerReflectionInfo method.
message ServerReflectionRequest {
string host = 1;
// To use reflection service, the client should set one of the following
// fields in message_request. The server distinguishes requests by their
// defined field and then handles them using corresponding methods.
oneof message_request {
// Find a proto file by the file name.
string file_by_filename = 3;
// Find the proto file that declares the given fully-qualified symbol name.
// This field should be a fully-qualified symbol name
// (e.g. <package>.<service>[.<method>] or <package>.<type>).
string file_containing_symbol = 4;
// Find the proto file which defines an extension extending the given
// message type with the given field number.
ExtensionRequest file_containing_extension = 5;
// Finds the tag numbers used by all known extensions of the given message
// type, and appends them to ExtensionNumberResponse in an undefined order.
// Its corresponding method is best-effort: it's not guaranteed that the
// reflection service will implement this method, and it's not guaranteed
// that this method will provide all extensions. Returns
// StatusCode::UNIMPLEMENTED if it's not implemented.
// This field should be a fully-qualified type name. The format is
// <package>.<type>
string all_extension_numbers_of_type = 6;
// List the full names of registered services. The content will not be
// checked.
string list_services = 7;
}
}
// The type name and extension number sent by the client when requesting
// file_containing_extension.
message ExtensionRequest {
// Fully-qualified type name. The format should be <package>.<type>
string containing_type = 1;
int32 extension_number = 2;
}
// The message sent by the server to answer ServerReflectionInfo method.
message ServerReflectionResponse {
string valid_host = 1;
ServerReflectionRequest original_request = 2;
// The server sets one of the following fields according to the message_request
// in the request.
oneof message_response {
// This message is used to answer file_by_filename, file_containing_symbol,
// file_containing_extension requests with transitive dependencies.
// As the repeated label is not allowed in oneof fields, we use a
// FileDescriptorResponse message to encapsulate the repeated fields.
// The reflection service is allowed to avoid sending FileDescriptorProtos
// that were previously sent in response to earlier requests in the stream.
FileDescriptorResponse file_descriptor_response = 4;
// This message is used to answer all_extension_numbers_of_type requests.
ExtensionNumberResponse all_extension_numbers_response = 5;
// This message is used to answer list_services requests.
ListServiceResponse list_services_response = 6;
// This message is used when an error occurs.
ErrorResponse error_response = 7;
}
}
// Serialized FileDescriptorProto messages sent by the server answering
// a file_by_filename, file_containing_symbol, or file_containing_extension
// request.
message FileDescriptorResponse {
// Serialized FileDescriptorProto messages. We avoid taking a dependency on
// descriptor.proto, which uses proto2 only features, by making them opaque
// bytes instead.
repeated bytes file_descriptor_proto = 1;
}
// A list of extension numbers sent by the server answering
// all_extension_numbers_of_type request.
message ExtensionNumberResponse {
// Full name of the base type, including the package name. The format
// is <package>.<type>
string base_type_name = 1;
repeated int32 extension_number = 2;
}
// A list of ServiceResponse sent by the server answering list_services request.
message ListServiceResponse {
// The information of each service may be expanded in the future, so we use
// ServiceResponse message to encapsulate it.
repeated ServiceResponse service = 1;
}
// The information of a single service used by ListServiceResponse to answer
// list_services request.
message ServiceResponse {
// Full name of a registered service, including its package name. The format
// is <package>.<service>
string name = 1;
}
// The error code and error message sent by the server when an error occurs.
message ErrorResponse {
// This field uses the error codes defined in grpc::StatusCode.
int32 error_code = 1;
string error_message = 2;
}