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Rust 网络编程进阶:零停机运维 —— 基于 ArcSwap 与 Notify 实现配置热加载

  • 2026-02-03 20:22:24
Rust 网络编程进阶:零停机运维 —— 基于 ArcSwap 与 Notify 实现配置热加载

在此前中,我们已经构建了一个性能强悍(Hyper)、安全(Rustls)、高可用(Retry & Failover)、可观测的网关程序。但它目前还存在着修改配置还需要重启等的问题,这使它不能作为一个 7x24小时长时间运行的基础设施。今天我们将通过 Rust 的并发原语(ArcSwap)和异步控制工具(CancellationToken)实现网关必须具备的“热重载”功能。


架构设计

要实现热加载,我们首先需要监控配置文件的变化、再然后原子更新配置文件中变化的值,最后取消还在探测旧地址的任务。

  1. 监控配置:使用 notify库监听文件系统事件。
  2. 原子更新:引入 ArcSwap。传统的 RwLock在高频读取下锁竞争严重,而 ArcSwap基于 RCU 机制,读操作几乎无锁,非常适合“读多写少”的配置场景。
  3. 任务编排:使用 CancellationToken优雅地杀死旧的健康检查任务,并启动新任务。

核心代码

引入依赖

notify = "8"
tokio-util = "0.7"

notify: 用于文件监听

tokio-utilCancellationToken用于实现可取消任务

原子状态管理

改造全局状态的存储方式

修改 config的类型 Arc<AppConfig>为 Arc<ArcSwap<AppConfig>>

使用 ArcSwap修饰 AppConfig, 这样我们就可以在后台原子地替换 AppConfig里的内容,而正在读取配置的线程不会受到任何影响。

修改 AppState 为原子 Map

use arc_swap::ArcSwap;

structAppState {
    upstreams: ArcSwap<HashMap<String, Arc<UpstreamState>>>,
}

upstreams: 支持原子替换的 Map

辅助的配置加载与状态创建函数

fnload_config(path: &str) -> Result<AppConfig, ProxyError> {
let config_content = fs::read_to_string(path)
        .map_err(|e| error(format!("Failed to read config file: {}", e)))?;
let config: AppConfig = toml::from_str(&config_content)
        .map_err(|e| error(format!("Failed to parse config TOML: {}", e)))?;
Ok(config)
}

fncreate_state_from_config(config: &AppConfig) -> (HashMap<String, Arc<UpstreamState>>, ()) {
letmut upstreams_state = HashMap::new();
for (name, u_conf) in &config.upstreams {
        upstreams_state.insert(
            name.clone(),
            Arc::new(UpstreamState {
                active_urls: ArcSwap::from_pointee(u_conf.urls.clone()),
                counter: AtomicUsize::new(0),
            }),
        );
    }
    (upstreams_state, ())
}

main 函数中初始加载配置

let args = Cli::parse();
let config_path = args.config.clone();
let initial_config = load_config(&config_path)?;

let (initial_state_map, _) = create_state_from_config(&initial_config);

let app_config = Arc::new(ArcSwap::from_pointee(initial_config));
let app_state = Arc::new(AppState {
    upstreams: ArcSwap::new(Arc::new(initial_state_map)),
});

let current_conf = app_config.load();
let certs = load_certs(&current_conf.server.cert_file)?;
let key = load_private_key(&current_conf.server.key_file)?;

初始化全局状态,将 Config和 AppState都放入 ArcSwap,以便原子替换

current_conf: 是从容器里取出的“瞬间的数据快照”,加载证书暂不支持热重载

修改 proxy_handler逻辑

修改函数签名
#[instrument(skip(client, config, state, req), fields(method = %req.method(), uri = %req.uri()))]
asyncfnproxy_handler(
    req: Request<Incoming>,
    client: Arc<HttpClient>,
    config: Arc<ArcSwap<AppConfig>>,
    state: Arc<AppState>,
    remote_addr: SocketAddr,
) -> Result<Response<BoxBody<Bytes, ProxyError>>, ProxyError> {
}

config类型修改为 Arc<ArcSwap<AppConfig>>

在 proxy_handler中调用 .load()读取配置
let current_config = config.load();

for route in &current_config.routes { ... }

config.load(): 获取当前配置快照,引用计数+1,速度极快

&current_config.routes: 后续使用快照进行路由匹配

获取 Upstream 状态
let current_state_map = state.upstreams.load();

state.upstreams.load(): 加载状态快照,后续读取 upstreams并使用的代码和上一版一致


配置热加载与健康检查管理

监控文件变更

开启一个通道来负责监听文件变化,并接收文件变更事件。

在 main函数初始化 hyper_util::client::legacy::Client后修改逻辑

let (tx, mut rx) = mpsc::channel(1);

letmut watcher = RecommendedWatcher::new(
move |res| {
let _ = tx.blocking_send(res);
    },
    notify::Config::default(),
)?;

watcher.watch(Path::new(&config_path), RecursiveMode::NonRecursive)?;

let manager_config = app_config.clone();
let manager_state = app_state.clone();
let manager_client = client.clone();
let config_file_path = config_path.clone()

watcher.watch...: 启动文件监听器

启动“配置管理 + 健康检查”任务

tokio::spawn(asyncmove {
letmut cancel_token = CancellationToken::new();
letmut health_handle = tokio::spawn(start_health_check_loop(
        manager_config.clone(),
        manager_state.clone(),
        manager_client.clone(),
        cancel_token.clone(),
    ));

    info!("Configuration watcher started for: {}", config_file_path);

whileletSome(res) = rx.recv().await {
match res {
Ok(event) => {
if matches!(event.kind, EventKind::Modify(_) | EventKind::Create(_)) {
                    info!("Config file changed, reloading...");
// 延迟等待,防止文件写入未完成
                    tokio::time::sleep(Duration::from_millis(100)).await;

match load_config(&config_file_path) {
Ok(new_conf) => {
                            info!("Config reloaded successfully!");

                            manager_config.store(Arc::new(new_conf.clone()));

let (new_state_map, _) = create_state_from_config(&new_conf);
                            manager_state.upstreams.store(Arc::new(new_state_map));

                            cancel_token.cancel();

let _ = health_handle.await;
                            info!("Old health check task stopped.");

                            info!("Starting new health check task...");
                            cancel_token = CancellationToken::new();
                            health_handle = tokio::spawn(start_health_check_loop(
                                manager_config.clone(),
                                manager_state.clone(),
                                manager_client.clone(),
                                cancel_token.clone(),
                            ));
                        }
Err(e) => {
                            error!("Failed to reload config: {}. Keeping old config.", e);
                        }
                    }
                }
            }
Err(e) => error!("Watch error: {:?}", e),
        }
    }
});

let mut cancel_token = CancellationToken::new();: 启动初始的健康检查任务,创建取消令牌,用于控制健康检查任务。

let mut health_handle = tokio::spawn(start_health_check_loop(..., cancel_token.clone()));: 启动初始任务,并持有句柄

while let Some(res) = rx.recv().await: 循环等待文件变更事件

matches!(event.kind, EventKind::Modify(_) | EventKind::Create(_)): 不同编辑器保存文件的方式不同,有时是 Modify,有时是 Rename/Create,所以这里监听 Modify 和 Create 能覆盖大多数情况

manager_config.store(Arc::new(new_conf.clone()));: 更新 Config,原子替换

manager_state.upstreams.store(Arc::new(new_state_map));: 更新 State

重启健康检查任务

cancel_token.cancel();: 发送取消信号给旧任务

let _ = health_handle.await;: 等待旧任务彻底退出

ealth_handle = tokio::spawn(start_health_check_loop(...): 启动新任务

注意⚠️ health_handle.await这一行。它保证了我们不会同时运行两个健康检查任务,避免了并发冲突。

支持取消的健康检查逻辑

asyncfnstart_health_check_loop(
    config: Arc<ArcSwap<AppConfig>>,
    state: Arc<AppState>,
    client: Arc<HttpClient>,
    token: CancellationToken,
) {
letmut interval = tokio::time::interval(Duration::from_secs(5));

loop {
        tokio::select! {
            _ = interval.tick() => {
// 继续执行
            }
            _ = token.cancelled() => {
                info!("Health check loop stopped.");
return;
            }
        }

let current_config = config.load();
let current_state_map = state.upstreams.load();

for (name, upstream_config) in &current_config.upstreams {
ifletSome(upstream_state) = current_state_map.get(name) {
letmut healthy_urls = Vec::new();
for url in &upstream_config.urls {
if check_upstream(&client, url).await {
                        healthy_urls.push(url.clone());
                    } else {
                        warn!("Health check failed for: {}", url);
                    }
                }

if healthy_urls.is_empty() {
                    warn!("All nodes down for upstream: {}", name);
                    upstream_state.active_urls.store(Arc::new(vec![]));
                } else {
let current_len = upstream_state.active_urls.load().len();
if current_len != healthy_urls.len() {
                        info!(
"Upstream '{}' healthy nodes changed: {} -> {:?}",
                            name, current_len, healthy_urls
                        );
                    }
                    upstream_state.active_urls.store(Arc::new(healthy_urls));
                }
            }
        }
    }
}

token: CancellationToken,: 函数新增支持取消的令牌参数

tokio::select!: 使用 select!同时等待继续执行还是取消的任务状态,当 oken.cancelled()到达时,loop循环将停止。

config和 state: 后续load当前配置快照以及当前状态快照使用


验证与测试:零停机演示

1. 启动网关

此时 config.toml的配置如下

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

日志输出如下:

2026-01-21T14:18:23.132429Z  INFO hyper_proxy_tool: Metrics endpoint exposed at http://0.0.0.0:9000/metrics
2026-01-21T14:18:23.244641Z  INFO hyper_proxy_tool: Configuration watcher started for: config.toml
2026-01-21T14:18:23.244641Z  INFO hyper_proxy_tool: HTTPS Proxy Server listening on https://0.0.0.0:8443
2026-01-21T14:18:25.247743Z  WARN hyper_proxy_tool: Health check failed for: https://httpbin.org
2026-01-21T14:18:26.548561Z  INFO hyper_proxy_tool: Upstream 'httpbin_cluster' healthy nodes changed: 2 -> ["https://postman-echo.com"]
2026-01-21T14:18:26.549310Z  WARN hyper_proxy_tool: Health check failed for: http://127.0.0.1:9001
2026-01-21T14:18:26.549359Z  WARN hyper_proxy_tool: All nodes down for upstream: local_ws
2026-01-21T14:18:29.381095Z  INFO hyper_proxy_tool: Upstream 'httpbin_cluster' healthy nodes changed: 1 -> ["https://httpbin.org", "https://postman-echo.com"]

正常启动并输出可访问的上游节点

2. 修改配置

postman-echo改成  postman-echo1

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

3. 观察日志

日志输出如下:

2026-01-21T14:20:49.231583Z  INFO hyper_proxy_tool: Config file changed, reloading...
2026-01-21T14:20:49.333868Z  INFO hyper_proxy_tool: Config reloaded successfully!
2026-01-21T14:20:49.333938Z  INFO hyper_proxy_tool: Health check loop stopped.
2026-01-21T14:20:49.333956Z  INFO hyper_proxy_tool: Old health check task stopped.
2026-01-21T14:20:49.333960Z  INFO hyper_proxy_tool: Starting new health check task...
2026-01-21T14:20:49.334008Z  INFO hyper_proxy_tool: Config file changed, reloading...
2026-01-21T14:20:49.436454Z  INFO hyper_proxy_tool: Config reloaded successfully!
2026-01-21T14:20:49.866433Z  WARN hyper_proxy_tool: Health check failed for: https://postman-echo1.com
2026-01-21T14:20:49.866472Z  INFO hyper_proxy_tool: Upstream 'httpbin_cluster' healthy nodes changed: 2 -> ["https://httpbin.org"]

Config file changed, reloading...

看出配置被实时进行热加载了,

Old health check task stopped.

旧的健康检查任务被停止了

Config reloaded successfully!

新的配置加载成功

Health check failed for: https://postman-echo1.com

使用新的配置

4. 发起curl请求

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

日志输出如下:

2026-01-21T14:28:27.841426Z  INFO proxy_handler{remote_addr=127.0.0.1:63905 method=GET uri=https://127.0.0.1:8443/api/v1/get}: hyper_proxy_tool: Attempt 1/1: Routing to https://httpbin.org (Buffered)

Attempt 1/1:: 可以看出只会有一个可用的健康节点了

5. 验证结果

  • 新请求:新发起的 curl请求,会立即使用新的路由规则,只会转发到 httpbin.org而不是旧的配置 postman-echo.com上。

这就是 RCU机制的威力。


完整代码地址链接

https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=8ea5c6e0ce4d6ea2141318a08c12c218


总结

  1. ArcSwap:用于在读多写少场景下的无锁状态共享。
  2. CancellationToken:实现了优雅的异步任务终止与重启。
  3. Channel Watcher:基于事件驱动的控制流。

现在,我们的程序实现了在不中断现有连接的前提下,动态更新网关的路由和上游配置,实现“零停机运维”。


Happy Coding with Rust🦀!

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  1. CONNECT:[ UseTime:0.001054s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001480s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.010524s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000933s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001402s ]
  6. SELECT * FROM `set` [ RunTime:0.003579s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001462s ]
  8. SELECT * FROM `article` WHERE `id` = 466512 LIMIT 1 [ RunTime:0.003523s ]
  9. UPDATE `article` SET `lasttime` = 1770502587 WHERE `id` = 466512 [ RunTime:0.011264s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001361s ]
  11. SELECT * FROM `article` WHERE `id` < 466512 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003308s ]
  12. SELECT * FROM `article` WHERE `id` > 466512 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001660s ]
  13. SELECT * FROM `article` WHERE `id` < 466512 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001847s ]
  14. SELECT * FROM `article` WHERE `id` < 466512 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003451s ]
  15. SELECT * FROM `article` WHERE `id` < 466512 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009614s ]
0.228188s