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
154
155
156
157
158
159
160
pub type Result<T> = std::result::Result<T, errors::Error>;
#[link(wasm_import_module = "wapc")]
extern "C" {
pub fn __console_log(ptr: *const u8, len: usize);
pub fn __host_call(
bd_ptr: *const u8,
bd_len: usize,
ns_ptr: *const u8,
ns_len: usize,
op_ptr: *const u8,
op_len: usize,
ptr: *const u8,
len: usize,
) -> usize;
pub fn __host_response(ptr: *const u8);
pub fn __host_response_len() -> usize;
pub fn __host_error_len() -> usize;
pub fn __host_error(ptr: *const u8);
pub fn __guest_response(ptr: *const u8, len: usize);
pub fn __guest_error(ptr: *const u8, len: usize);
pub fn __guest_request(op_ptr: *const u8, ptr: *const u8);
}
pub fn host_call(binding: &str, ns: &str, op: &str, msg: &[u8]) -> Result<Vec<u8>> {
let callresult = unsafe {
__host_call(
binding.as_ptr() as _,
binding.len() as _,
ns.as_ptr() as _,
ns.len() as _,
op.as_ptr() as _,
op.len() as _,
msg.as_ptr() as _,
msg.len() as _,
)
};
if callresult != 1 {
let errlen = unsafe { __host_error_len() };
let buf = Vec::with_capacity(errlen as _);
let retptr = buf.as_ptr();
let slice = unsafe {
__host_error(retptr);
std::slice::from_raw_parts(retptr as _, errlen as _)
};
Err(errors::new(errors::ErrorKind::HostError(
String::from_utf8(slice.to_vec()).unwrap(),
)))
} else {
let len = unsafe { __host_response_len() };
let buf = Vec::with_capacity(len as _);
let retptr = buf.as_ptr();
let slice = unsafe {
__host_response(retptr);
std::slice::from_raw_parts(retptr as _, len as _)
};
Ok(slice.to_vec())
}
}
#[macro_export]
macro_rules! wapc_handler {
($user_handler:ident) => {
#[no_mangle]
pub extern "C" fn __guest_call(op_len: i32, req_len: i32) -> i32 {
use std::slice;
use $crate::console_log;
let buf: Vec<u8> = Vec::with_capacity(req_len as _);
let req_ptr = buf.as_ptr();
let opbuf: Vec<u8> = Vec::with_capacity(op_len as _);
let op_ptr = opbuf.as_ptr();
let (slice, op) = unsafe {
$crate::__guest_request(op_ptr, req_ptr);
(
slice::from_raw_parts(req_ptr, req_len as _),
slice::from_raw_parts(op_ptr, op_len as _),
)
};
let opstr = ::std::str::from_utf8(op).unwrap();
match $user_handler(&opstr, slice) {
Ok(msg) => unsafe {
$crate::__guest_response(msg.as_ptr(), msg.len() as _);
1
},
Err(e) => {
let errmsg = format!("Guest call failed: {}", e);
console_log(&errmsg);
unsafe {
$crate::__guest_error(errmsg.as_ptr(), errmsg.len() as _);
}
0
}
}
}
};
}
#[cold]
#[inline(never)]
pub fn console_log(s: &str) {
unsafe {
__console_log(s.as_ptr(), s.len());
}
}
pub mod errors;
pub mod prelude;