web_panic_hook 0.1.0

Panic handling in the browser (wasm)
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

#![recursion_limit = "512"]

use std::panic::PanicInfo;

use html::{
    content::{Header, Heading1},
    text_content::{Division, PreformattedText, ThematicBreak},
};
use web_sys::DomException;

/// Panic hook for use with [`std::panic::set_hook()`].
///
/// Opens a new screen in the DOM with panic information.
pub fn hook(panic_info: &PanicInfo) {
    let stack = DomException::new().unwrap().stack();
    let stack = trim_trace(&stack);
    let body = web_sys::window()
        .unwrap()
        .document()
        .unwrap()
        .body()
        .unwrap();
    let payload = format!("{panic_info}\n\n{stack}");
    let error = PreformattedText::builder()
        .style(
            "background-color:#d47031;\
             border-width:1px;\
             border-color:black;\
             border-style:solid;\
             padding:12px;\
             margin:auto 12px;\
             border-radius:8px;\
             font-size:18px;\
             font-family:monospace;\
             overflow-x: scroll;\
             overflow-y: hidden;\
             scrollbar-color: #FFFF #0000;\
             scrollbar-width: 4px;\
             ",
        )
        .push(payload)
        .build();
    let header = Header::builder()
        .style(
            "margin:0 12px 0;\
             border:0;\
             padding:0;\
             ",
        )
        .push(
            Heading1::builder()
                .style(
                    "margin:0;\
                     border:0;\
                     padding:0;\
                     font-size:22px;\
                     ",
                )
                .push("Oh, no — Something went wrongly!")
                .build(),
        )
        .build();
    let popup = Division::builder()
        .style(
            "background-color:#de742c;\
             color:black;\
             outline: 4px solid black;\
             width:100%;\
             max-width:1000px;\
             margin:12px auto;\
             border-radius:8px;\
             border:0;\
             padding:12px 0 12px;\
             overflow-y: scroll;\
             overflow-x: hidden;\
             scrollbar-color: #FFFF #0000;\
             scrollbar-width: 4px;\
             ",
        )
        .push(header)
        .push(
            ThematicBreak::builder()
                .style(
                    "margin:12px;\
                     color:black;\
                     border:0;\
                     outline:1px solid black;\
                     ",
                )
                .build(),
        )
        .push(error)
        .build();
    let div = Division::builder()
        .style(
            "display:grid;\
             height:100vh;\
             width:100%;\
             border:0;\
             margin:0;\
             padding:0;\
             position:absolute;\
             top:0;\
             left:0;\
             background-color:#180C08FF;\
             ",
        )
        .push(popup)
        .build();

    body.set_inner_html(&div.to_string());
}

fn trim_trace(stack_trace: &str) -> &str {
    const EXC: &str = "web_sys::features::gen_DomException::DomException::new";

    let Some(index) = stack_trace.find(EXC) else {
        return stack_trace;
    };
    let new = &stack_trace[index..];
    let Some(index) = new.find('\n') else {
        return stack_trace;
    };
    let stack_trace = &new[index + 1..];
    let Some(index) = stack_trace.find("std::rt::lang_start") else {
        return stack_trace;
    };

    &stack_trace[..index]
}