camber 0.1.8

Opinionated async Rust for IO-bound services on top of Tokio
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142

mod common;

use camber::http::{self, Request, Response, Router};
use camber::{runtime, spawn_async};
use std::sync::Arc;
use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
use std::thread;
use std::time::Duration;

#[camber::test]
async fn pool_dispatches_concurrent_http_requests() {
    let mut router = Router::new();
    router.get("/hello", |_req: &Request| async {
        Response::text(200, "Hello, world!")
    });

    let addr = common::spawn_server(router);

    // Send 20 concurrent requests from separate tasks
    let counter = Arc::new(AtomicUsize::new(0));
    let mut handles = Vec::new();

    for _ in 0..20 {
        let counter = Arc::clone(&counter);
        let url = format!("http://{addr}/hello");
        let h = spawn_async(async move {
            let resp = http::get(&url).await.unwrap();
            assert_eq!(resp.status(), 200);
            assert_eq!(resp.body(), "Hello, world!");
            counter.fetch_add(1, Ordering::SeqCst);
        });
        handles.push(h);
    }

    for h in handles {
        h.await.unwrap();
    }

    assert_eq!(counter.load(Ordering::SeqCst), 20);

    runtime::request_shutdown();
}

#[test]
fn pool_backpressure_under_load() {
    runtime::builder()
        .worker_threads(2)
        .keepalive_timeout(Duration::from_secs(5))
        .shutdown_timeout(Duration::from_secs(1))
        .run(|| {
            common::block_on(async {
                let completed = Arc::new(AtomicUsize::new(0));

                let mut router = Router::new();
                let completed_inner = Arc::clone(&completed);
                router.get("/slow", move |_req: &Request| {
                    let completed_inner = completed_inner.clone();
                    async move {
                        // Occupy both workers so remaining requests must queue.
                        thread::sleep(Duration::from_millis(100));
                        completed_inner.fetch_add(1, Ordering::SeqCst);
                        Response::text(200, "done")
                    }
                });

                let addr = common::spawn_server(router);
                let client = Arc::new(http::client());
                let mut handles = Vec::new();
                for _ in 0..10 {
                    let client = Arc::clone(&client);
                    let url = format!("http://{addr}/slow");
                    let handle = spawn_async(async move {
                        let resp = client.get(&url).await.unwrap();
                        assert_eq!(resp.status(), 200);
                    });
                    handles.push(handle);
                }

                for handle in handles {
                    handle.await.unwrap();
                }

                assert_eq!(completed.load(Ordering::SeqCst), 10);
                runtime::request_shutdown();
            });
        })
        .unwrap();
}

#[camber::test]
async fn acceptor_stops_on_shutdown() {
    let mut router = Router::new();
    router.get("/hello", |_req: &Request| async {
        Response::text(200, "Hello, world!")
    });

    let addr = common::spawn_server(router);

    // Confirm server is alive
    let resp = http::get(&format!("http://{addr}/hello")).await.unwrap();
    assert_eq!(resp.status(), 200);

    // Request shutdown
    runtime::request_shutdown();
    // If we get here, serve_listener returned Ok — test passes
}

#[camber::test]
async fn pool_workers_joined_on_shutdown() {
    let handler_finished = Arc::new(AtomicBool::new(false));
    let handler_flag = Arc::clone(&handler_finished);

    let mut router = Router::new();
    router.get("/slow", move |_req: &Request| {
        let handler_flag = handler_flag.clone();
        async move {
            thread::sleep(Duration::from_millis(200));
            handler_flag.store(true, Ordering::Release);
            Response::text(200, "done")
        }
    });

    let addr = common::spawn_server(router);

    // Send a request that will be in-flight during shutdown
    let url = format!("http://{addr}/slow");
    let client = spawn_async(async move { http::get(&url).await.unwrap() });

    // Small delay to ensure the request reaches the handler
    tokio::time::sleep(Duration::from_millis(50)).await;

    // Request shutdown while handler is still sleeping
    runtime::request_shutdown();

    // Wait for client to get its response
    let resp = client.await.unwrap();
    assert_eq!(resp.status(), 200);

    // After runtime::run returns, serve_listener has returned, which means
    // pool.shutdown() joined all workers. The handler must have completed.
    assert!(handler_finished.load(Ordering::Acquire));
}