eqts 0.2.0

One Rust API for TypeScript across native JavaScript runtimes
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
143
144
145
146
147
148
149
150
151
152
153

use std::collections::VecDeque;

#[derive(Clone)]
pub struct Values(VecDeque<u32>);

#[eqts::methods]
impl Values {
    #[eqts::method]
    #[expect(clippy::missing_panics_doc)]
    pub fn push(&mut self, value: u32) -> u32 {
        self.0.push_back(value);
        u32::try_from(self.0.len()).expect("test queue length fits u32")
    }

    #[eqts::method]
    #[expect(clippy::missing_panics_doc, clippy::unused_async)]
    pub async fn size(&self) -> u32 {
        u32::try_from(self.0.len()).expect("test queue length fits u32")
    }
}

impl eqts::ReactiveResource for Values {
    fn poll(&mut self) -> Result<eqts::ReactivePoll, String> {
        Ok(self
            .0
            .pop_front()
            .map_or(eqts::ReactivePoll::Done, |value| {
                eqts::ReactivePoll::Ready(serde_json::json!(value))
            }))
    }
}

eqts::setup!();

#[eqts::stream(u32)]
#[must_use]
pub fn numbers() -> Values {
    Values([1, 2].into())
}

#[eqts::async_export(String)]
#[must_use]
#[expect(clippy::unused_async)]
pub async fn delayed_name() -> String {
    "ready".into()
}

#[eqts::callback(String)]
#[must_use]
#[expect(clippy::missing_panics_doc, clippy::needless_pass_by_value)]
pub fn events(callback: eqts::Callback<String>) -> Values {
    callback
        .emit("created".into())
        .expect("callback queue available");
    Values(VecDeque::new())
}

#[eqts::object(String)]
#[must_use]
pub fn state() -> Values {
    Values(VecDeque::new())
}

#[eqts::iterator(u32)]
#[must_use]
pub fn range(end: u32) -> Values {
    Values((0..end).collect())
}

#[test]
fn reactive_poll_is_demand_driven_and_disposal_is_idempotent() {
    let handle = eqts::register_reactive(Values([1, 2].into()));
    let mut output = eqts::OwnedBuffer::empty();
    // SAFETY: output points to live writable storage.
    assert_eq!(
        unsafe { eqts_reactive_poll_v1(handle, &raw mut output) },
        eqts::ABI_REACTIVE_READY
    );
    // SAFETY: allocation came from the poll wrapper and is consumed once.
    unsafe { drop(Vec::from_raw_parts(output.ptr, output.len, output.capacity)) };
    assert_eq!(eqts_handle_dispose_v1(handle), eqts::ABI_OK);
    assert_eq!(eqts_handle_dispose_v1(handle), eqts::ABI_OK);
}

#[test]
fn callback_queue_has_one_item_backpressure() {
    let handle = eqts::register_reactive(Values(VecDeque::new()));
    eqts::enqueue_callback(handle, "first".to_string()).expect("first callback fits");
    assert!(eqts::enqueue_callback(handle, "second".to_string()).is_err());
    assert_eq!(eqts_reactive_cancel_v1(handle), eqts::ABI_OK);
    assert_eq!(eqts_reactive_cancel_v1(handle), eqts::ABI_OK);
}

#[test]
fn reactive_annotations_emit_handles_and_kinds() {
    let mut handle = 0;
    // SAFETY: output points to live writable storage.
    assert_eq!(
        unsafe { eqts_numbers(std::ptr::null(), 0, &raw mut handle) },
        eqts::ABI_OK
    );
    assert_ne!(handle, 0);
    let metadata: serde_json::Value =
        serde_json::from_slice(eqts::metadata_json()).expect("metadata must be JSON");
    let kinds = metadata["functions"]
        .as_array()
        .expect("functions must be an array")
        .iter()
        .map(|function| function["kind"]["kind"].as_str().expect("kind string"))
        .collect::<Vec<_>>();
    assert_eq!(kinds, ["async", "callback", "stream", "iterator", "object"]);
    let input = b"[2]";
    // SAFETY: input and output remain valid for the call.
    assert_eq!(
        unsafe { eqts_range(input.as_ptr(), input.len(), &raw mut handle) },
        eqts::ABI_OK
    );
    let object = state();
    let object_handle = eqts::register_object(object);
    assert_eq!(
        eqts::invoke_handle(object_handle, "push", vec![serde_json::json!(7)])
            .expect("method works"),
        serde_json::json!(1)
    );
    assert_eq!(metadata["method_sets"][0]["methods"][0]["name"], "push");
    let future =
        eqts::invoke_handle_async(object_handle, "size", vec![]).expect("async method starts");
    assert_ne!(future, 0);
    let mut ready = None;
    for _ in 0..100 {
        match eqts::poll_reactive(future).expect("future handle exists") {
            (eqts::ABI_REACTIVE_READY, value) => {
                ready = value;
                break;
            }
            (eqts::ABI_REACTIVE_PENDING, _) => std::thread::yield_now(),
            (status, _) => panic!("unexpected async status {status}"),
        }
    }
    assert_eq!(ready.expect("future completes"), b"1".as_slice());
    let cancelled =
        eqts::invoke_handle_async(object_handle, "size", vec![]).expect("async method starts");
    assert_eq!(eqts::cancel_reactive(cancelled), eqts::ABI_OK);
    assert_eq!(
        eqts::poll_reactive(cancelled).expect("cancelled handle").0,
        eqts::ABI_REACTIVE_DONE
    );
    assert_eq!(eqts::dispose_reactive(cancelled), eqts::ABI_OK);
    assert_eq!(
        metadata["method_sets"][0]["methods"][1]["asynchronous"],
        true
    );
}