application-toys-macros 0.0.2

Procedural macros for application-toys — makes async trait methods dyn-compatible via #[asynchronous]
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

//! Integration tests for the #[asynchronous] attribute macro.
#![allow(dead_code)]

use toys_macros::asynchronous;

// ── Trait declaration ────────────────────────────────────────────────────────

#[asynchronous]
trait Worker {
    async fn run(&self, n: u32) -> String;
    async fn compute(&mut self, x: i32, y: i32) -> i32;
    // Non-async methods must pass through unchanged
    fn name(&self) -> &str;
    // Static (no receiver) async → 'static
    async fn create() -> Self
    where
        Self: Sized;
}

// ── Impl block ───────────────────────────────────────────────────────────────

struct MyWorker {
    label: String,
}

#[asynchronous]
impl Worker for MyWorker {
    async fn run(&self, n: u32) -> String {
        format!("{}: {n}", self.label)
    }

    async fn compute(&mut self, x: i32, y: i32) -> i32 {
        self.label = format!("computed({x},{y})");
        x + y
    }

    fn name(&self) -> &str {
        &self.label
    }

    async fn create() -> Self {
        MyWorker { label: String::from("new") }
    }
}

// ── no_sync flag ─────────────────────────────────────────────────────────────

#[asynchronous(no_sync)]
trait SendOnly {
    async fn go(&self) -> u32;
}

struct S;

#[asynchronous(no_sync)]
impl SendOnly for S {
    async fn go(&self) -> u32 {
        42
    }
}

// ── local flag ───────────────────────────────────────────────────────────────

#[asynchronous(local)]
trait LocalTrait {
    async fn compute(&self) -> i32;
}

struct L;

#[asynchronous(local)]
impl LocalTrait for L {
    async fn compute(&self) -> i32 {
        7
    }
}

// ── static_lifetime flag ─────────────────────────────────────────────────────

#[asynchronous(static_lifetime)]
trait StaticTrait {
    async fn ping(&self) -> bool;
}

struct St;

#[asynchronous(static_lifetime)]
impl StaticTrait for St {
    async fn ping(&self) -> bool {
        true
    }
}

// ── Runtime smoke test ───────────────────────────────────────────────────────

#[test]
fn test_basic_expansion() {
    let rt = tokio::runtime::Runtime::new().unwrap();

    let worker = MyWorker { label: String::from("test") };
    let result = rt.block_on(worker.run(5));
    assert_eq!(result, "test: 5");

    let mut worker2 = MyWorker { label: String::from("initial") };
    let sum = rt.block_on(worker2.compute(3, 4));
    assert_eq!(sum, 7);
    assert_eq!(worker2.name(), "computed(3,4)");

    let created = rt.block_on(MyWorker::create());
    assert_eq!(created.name(), "new");
}

#[test]
fn test_no_sync() {
    let rt = tokio::runtime::Runtime::new().unwrap();
    let s = S;
    let v = rt.block_on(s.go());
    assert_eq!(v, 42);
}

#[test]
fn test_local() {
    // LocalTrait futures are not Send, so run on current-thread runtime
    let rt = tokio::runtime::Builder::new_current_thread().enable_all().build().unwrap();
    let l = L;
    let v = rt.block_on(l.compute());
    assert_eq!(v, 7);
}

#[test]
fn test_static_lifetime() {
    let rt = tokio::runtime::Runtime::new().unwrap();
    let st = St;
    assert!(rt.block_on(st.ping()));
}