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use std::ffi::{self, CStr, CString};
#[repr(C)]
struct ModuleRequest<'req> {
headers_len: ffi::c_ulong,
headers: &'req [[*const ffi::c_char; 2]],
body_len: ffi::c_ulong,
body: *const u8,
}
#[repr(C)]
struct ModuleResponse {
status: ffi::c_ushort,
headers_len: ffi::c_ulong,
headers: &'static [[*const ffi::c_char; 2]],
body_len: ffi::c_ulong,
body: *const u8,
}
const HEADERS: &'static [[*const ffi::c_char; 2]] =
&[[c"Content-Type".as_ptr(), c"text/plain".as_ptr()]];
#[unsafe(no_mangle)]
extern "C" fn handle(req: *const ModuleRequest) -> *const ModuleResponse {
let mut ret = String::new();
// unwrap is bad here
let reqref = unsafe { req.as_ref() }.unwrap();
for idx in 0..reqref.headers_len {
let kvarr = reqref.headers[idx as usize];
let k = unsafe { CStr::from_ptr(kvarr[0]) }.to_string_lossy();
let v = unsafe { CStr::from_ptr(kvarr[1]) }.to_string_lossy();
ret.push_str(&format!("{k}: {v}\n"));
}
let body = CString::new(ret).unwrap();
let resp = ModuleResponse {
status: 200,
headers_len: 1,
headers: HEADERS,
body_len: body.as_bytes().len() as u64,
body: body.into_raw() as *const u8,
};
let boxed = Box::new(resp);
Box::<ModuleResponse>::into_raw(boxed)
}
#[unsafe(no_mangle)]
extern "C" fn free(req: *const ModuleResponse) {
// from_raw what we need to here so that these get dropped
let boxed = unsafe { Box::from_raw(req as *mut ModuleResponse) };
let body = unsafe { CString::from_raw(boxed.body as *mut i8) };
}
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