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Rust 网络编程进阶:使用 Tower::retry 实现多级重试策略与故障转移机制

  • 2026-01-10 17:07:18
Rust 网络编程进阶:使用 Tower::retry 实现多级重试策略与故障转移机制

在之前我们是通过原子操作 AtomicUsize实现了 Round-Robin 负载均衡策略。但这仅仅解决的是“流量分发”的问题,还并未处理“容错”的问题。在目前的程序中,如果流量通过负载均衡刚好打在A节点上,但如果A节点刚好宕机,网关将直接返回 502错误,导致服务可用性下降。

为了提升网关的健壮性,我们需要在代码层面引入两级容错机制:

  1. 节点重试:利用 tower重试中间件,针对偶发的网络抖动或服务端繁忙(5xx)进行重试。
  2. 故障转移:当重试无效时,自动切换至服务列表的下一个节点。

定义重试策略

第一步先定义一个结构体并实现 tower::retry::PolicyTrait,实现 retry(“何时重试”)和 clone_request(“如何克隆请求”)的逻辑。

tower::retry中间件依赖于自定义 Policy

重试策略逻辑:

  1. result为 Err(如连接超时、DNS错误) -> 重试
  2. result为 Ok但状态码是 5xx (服务端错误) -> 重试
  3. 其他情况 (如 200 OK 或 400 Bad Request) -> 不重试

代码实现如下:

use tower::retry::Policy;

#[derive(Clone)]
structProxyRetryPolicy {
    max_attempts: usize// 最大重试次数
}

impl ProxyRetryPolicy {
fnnew(max_attempts: usize) -> Self {
Self { max_attempts }
    }
}

impl<B, E> Policy<Request<B>, Response<Incoming>, E> for ProxyRetryPolicy
where
    B: Clone,
    E: Into<BoxError>,
{
typeFuture = std::future::Ready<()>;

fnretry(&mutself, _req: &mut Request<B>, result: &mutResult<Response<Incoming>, E>) -> Option<Self::Future> {
ifself.max_attempts == 0 {
returnNone;
        }

let should_retry = match result {
Ok(res) => res.status().is_server_error(),
Err(_) => true,
        };

if should_retry {
self.max_attempts -= 1;
Some(std::future::ready(()))
        } else {
None
        }
    }

fnclone_request(&mutself, req: &Request<B>) -> Option<Request<B>> {
letmut builder = Request::builder()
            .method(req.method())
            .uri(req.uri())
            .version(req.version());

for (k, v) in req.headers() {
            builder = builder.header(k, v);
        }

        builder.body(req.body().clone()).ok()
    }
}

retry方法决定是否重试

res.status().is_server_error(): 检查状态码是否在 500-599 之间,如果是则是 true

future::ready(()): 进行重试

clone_request方法是定义克隆请求逻辑,Body必须得支持 Clone

Body 缓冲与请求拆解

实现故障转移的难点是:同一个 HTTP 请求可能需要被发送多次(发给节点 A 失败后,再发给节点 B)。

因为 Hyper的默认 Body类型 Incoming是一个流,它是“一次性”的,读取后即被消耗,无法克隆。直接重试会触发编译错误 E0382: use of moved value

解决方案:

  1. Request 拆解:使用 req.into_parts()将请求分离为元数据(Parts)和数据流(Body)。
  2. Body 缓冲:将流式 Body 读取到内存中,转换为 Full<Bytes>。该类型实现了 Clone,支持多次发送。

修改 proxy_handler的前置处理逻辑:

// ...
// 路径重写
// if route.strip_prefix {...} 
// 上面代码逻辑和之前一样

let (parts, body) = req.into_parts();

let body_bytes = body.collect().await?.to_bytes();
let body_full = Full::new(body_bytes); 

req.into_parts(): 拆解 Request,将 req的所有权转移,分为 parts和 body

缓冲 Body,将流转换为 Bytes,并封装为 Full<Bytes>

注意⚠️:此时原始的 req变量已不可用,在后续构建请求必须使用 parts和 body_full来构建

实现故障转移

随后在 proxy_handler中循环遍历上游节点列表。只有当 RetryLayer在当前节点的所有尝试均失败后,才会进入下一次循环,即切换节点。

let max_failover_attempts = upstream_config.urls.len();

for attempt in0..max_failover_attempts {
let current_count = upstream_config.counter.fetch_add(1, Ordering::Relaxed);
let index = current_count % upstream_config.urls.len();
let upstream_url_str = &upstream_config.urls[index];

let upstream_base = match upstream_url_str.parse::<Uri>() {
Ok(u) => u,
Err(e) => {
            error!("Invalid upstream URL: {}", e);
continue;
        }
    };

    info!(
"Attempt {}/{}: Routing to {}",
        attempt + 1,
        max_failover_attempts,
        upstream_url_str
    );

let base_str = upstream_base.to_string();
let base_trimmed = base_str.trim_end_matches('/');
let uri_string = format!("{}{}", base_trimmed, final_path); // URL 拼接
let new_uri = match uri_string.parse::<Uri>() {
Ok(u) => u,
Err(e) => {
            error!("Invalid constructed URI: {}", e);
continue;
        }
    };

letmut builder = Request::builder()
        .method(parts.method.clone())
        .uri(new_uri)
        .version(parts.version);

for (k, v) in &parts.headers {
        builder = builder.header(k, v);
    }

// 构造请求体
let retry_req = builder.body(body_full.clone())?;

let retry_service = ServiceBuilder::new()
        .layer(tower::retry::RetryLayer::new(ProxyRetryPolicy::new(3)))
        .service(service_fn(|req: Request<Full<Bytes>>| {
let client = client.clone();
asyncmove {
let (p, b) = req.into_parts();
let boxed = b.map_err(|e| match e {}).boxed();
                client.request(Request::from_parts(p, boxed)).await
            }
        }));

match retry_service.oneshot(retry_req).await {
Ok(res) => {
// 请求成功,直接返回结果,结束循环
let res_boxed = res.map(|b| b.map_err(|e| Box::new(e) as ProxyError).boxed());
returnOk(res_boxed);
        }
Err(err) => {
// 当前节点彻底失败(重试耗尽),记录日志,continue 进入下一次循环
            warn!("Upstream {} failed: {:?}. Trying next node...", upstream_url_str, err);
            last_error = Some(Box::new(err));
        }
    }
}

// 循环结束仍未返回,说明所有节点均不可用
error!(
"All upstreams failed for route '{}'. Last error: {:?}",
    route.path, last_error
);
record_metrics(&method_str, "502", upstream_name, start);

let body = Empty::<Bytes>::new().map_err(|e| match e {}).boxed();
letmut resp = Response::new(body);
*resp.status_mut() = StatusCode::BAD_GATEWAY;
Ok(resp)

max_failover_attempts: 尝试次数 = 节点数量,确保每个节点都有机会被调用

upstream_config.counter.fetch_add...依然是使用 Round-Robin策略进行原子性选址,随后是解析 URL 和 拼接 Path

使用拆解出的 parts和可克隆的 body_full来构造新请求

retry_service...: 构建重试策略的 tower服务层逻辑

ProxyRetryPolicy::new(3): 单节点内部重试 3 次

client.request(Request::from_parts(p, boxed))...: 将 Full<Bytes>转回 Client需要的 BoxBody并发送请求

retry_service.oneshot: 执行请求与错误处理逻辑

测试验证

修改 config.toml

[upstreams]
[upstreams.httpbin_cluster]
urls = [
  "https://httpbin.org",
  "https://postman-echo1.com"
]

故意把 https://postman-echo.com写错 https://postman-echo1.com

第一次执行请求

curl -v -k https://127.0.0.1:8443/api/v1/get

程序日志输出:

2026-01-06T15:48:51.832962Z  INFO hyper_proxy_tool: Serving connection using HTTP/2
2026-01-06T15:48:51.834642Z  INFO proxy_handler{remote_addr=127.0.0.1:64580 method=GET uri=https://127.0.0.1:8443/api/v1/get}: hyper_proxy_tool: Attempt 1/2: Routing to https://httpbin.org

正确,匹配到第一个节点 https://httpbin.org成功响应

第二次执行请求

curl -v -k https://127.0.0.1:8443/api/v1/get

程序日志输出:

2026-01-06T15:48:58.509269Z  INFO hyper_proxy_tool: Serving connection using HTTP/2
2026-01-06T15:48:58.509990Z  INFO proxy_handler{remote_addr=127.0.0.1:64610 method=GET uri=https://127.0.0.1:8443/api/v1/get}: hyper_proxy_tool: Attempt 1/2: Routing to https://postman-echo1.com
2026-01-06T15:48:58.547419Z  WARN proxy_handler{remote_addr=127.0.0.1:64610 method=GET uri=https://127.0.0.1:8443/api/v1/get}: hyper_proxy_tool: Upstream https://postman-echo1.com failed after retries: hyper_util::client::legacy::Error(Connect, ConnectError("dns error", Custom { kind: Uncategorized, error: "failed to lookup address information: nodename nor servname provided, or not known" })). Trying next node...
2026-01-06T15:48:58.547560Z  INFO proxy_handler{remote_addr=127.0.0.1:64610 method=GET uri=https://127.0.0.1:8443/api/v1/get}: hyper_proxy_tool: Attempt 2/2: Routing to https://httpbin.org

被路由到 https://postman-echo1.com,错误的上游节点,然后打印 Trying next node...,最后路由到下一个节点 https://httpbin.org,正确。

总结

我们利用 tower 强大的中间件能力实现了重试与故障转移机制:

  1. 控制流嵌套
    • 外层循环:负责切换上游节点以解决单点故障。
    • 内层 Tower Retry:负责针对单一节点的网络延迟进行重试以减少偶发性错误。
  2. 内存安全与生命周期
    • 通过 into_parts移动原始 req的所有权来避免 borrow of moved value的错误,确保在多次循环中能够重复构建合法的 HTTP 请求。

现在,我们的 hyper-proxy-tool能够在上游服务部分节点宕机的情况下,自动将流量无缝迁移至健康节点,保障服务的连续性。

Happy Coding with Rust🦀!

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  1. CONNECT:[ UseTime:0.000748s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000738s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006752s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006932s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000838s ]
  6. SELECT * FROM `set` [ RunTime:0.002483s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000674s ]
  8. SELECT * FROM `article` WHERE `id` = 460843 LIMIT 1 [ RunTime:0.009705s ]
  9. UPDATE `article` SET `lasttime` = 1770558189 WHERE `id` = 460843 [ RunTime:0.008427s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.005087s ]
  11. SELECT * FROM `article` WHERE `id` < 460843 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000660s ]
  12. SELECT * FROM `article` WHERE `id` > 460843 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005035s ]
  13. SELECT * FROM `article` WHERE `id` < 460843 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007548s ]
  14. SELECT * FROM `article` WHERE `id` < 460843 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007883s ]
  15. SELECT * FROM `article` WHERE `id` < 460843 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.032476s ]
0.174578s