# Rust {/* #rust */}

首先阅读 [gRPC 指南](/docs/zh/api/grpc)，获取平台 API 令牌并下载 `platform.proto`。本示例使用 [tonic 和 tonic-prost-build](https://docs.rs/tonic-build/latest/tonic_build/) 生成原生 HTTP/2 客户端。请先安装 Rust 和 `protoc`。

创建项目，并将下载的契约放在 `proto/platform.proto`：

```bash
cargo new reconstruct-client
cd reconstruct-client
mkdir proto
```

使用以下 `Cargo.toml`：

```toml
[package]
name = "reconstruct-client"
version = "0.1.0"
edition = "2021"

[dependencies]
prost = "0.14"
tokio = { version = "1", features = ["macros", "rt-multi-thread"] }
tonic = { version = "0.14", features = ["transport", "tls-ring", "tls-native-roots"] }
tonic-prost = "0.14"

[build-dependencies]
tonic-prost-build = "0.14"
```

在项目根目录使用 `build.rs`，在构建期间生成客户端类型：

```rust
fn main() -> Result<(), Box<dyn std::error::Error>> {
    tonic_prost_build::configure()
        .build_server(false)
        .compile_protos(&["proto/platform.proto"], &["proto"])?;
    Ok(())
}
```

在 `src/main.rs` 中使用生成的客户端：

```rust
use std::env;
use tonic::{transport::{Channel, ClientTlsConfig}, Request};

pub mod platform {
    tonic::include_proto!("reconstruct.platform.v1");
}

use platform::{
    platform_service_client::PlatformServiceClient,
    GetCatalogRequest, ListCatalogsRequest,
};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let token = env::var("CR_RECONSTRUCT_API_TOKEN")?;
    let channel = Channel::from_static("https://reconstruct.dev")
        .tls_config(ClientTlsConfig::new().with_native_roots())?
        .connect()
        .await?;
    let mut client = PlatformServiceClient::new(channel);

    let mut request = Request::new(ListCatalogsRequest {
        page_size: 10,
        page_token: String::new(),
    });
    request.metadata_mut().insert("authorization", format!("Bearer {token}").parse()?);
    let page = client.list_catalogs(request).await?.into_inner();

    for catalog in page.catalogs {
        let mut request = Request::new(GetCatalogRequest { catalog_id: catalog.catalog_id });
        request.metadata_mut().insert("authorization", format!("Bearer {token}").parse()?);
        let detail = client.get_catalog(request).await?.into_inner();
        println!("{}: {}", detail.catalog_id, detail.description);
    }
    Ok(())
}
```

运行 `cargo run`。原生 gRPC 连接到 HTTPS 主机和端口；`/api/v1/platform` 仅适用于 REST。