use std::ffi::CStr;
use std::fmt;
use std::marker::PhantomData;
use std::os::raw::{c_char, c_int, c_uchar, c_void};
use std::ptr;
use std::slice;
use itertools::Itertools;
use crate::error::{Error, Result};
use crate::panic;
#[derive(Debug)]
pub struct CAAResults {
caa_reply: *mut c_ares_sys::ares_caa_reply,
phantom: PhantomData<c_ares_sys::ares_caa_reply>,
}
#[derive(Clone, Copy)]
pub struct CAAResult<'a> {
caa_reply: &'a c_ares_sys::ares_caa_reply,
}
impl CAAResults {
pub fn parse_from(data: &[u8]) -> Result<CAAResults> {
let mut caa_reply: *mut c_ares_sys::ares_caa_reply = ptr::null_mut();
let parse_status = unsafe {
c_ares_sys::ares_parse_caa_reply(data.as_ptr(), data.len() as c_int, &mut caa_reply)
};
if parse_status == c_ares_sys::ARES_SUCCESS {
let caa_result = CAAResults::new(caa_reply);
Ok(caa_result)
} else {
Err(Error::from(parse_status))
}
}
fn new(caa_reply: *mut c_ares_sys::ares_caa_reply) -> Self {
CAAResults {
caa_reply,
phantom: PhantomData,
}
}
pub fn iter(&self) -> CAAResultsIter {
CAAResultsIter {
next: unsafe { self.caa_reply.as_ref() },
}
}
}
impl fmt::Display for CAAResults {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
let results = self.iter().format("}, {");
write!(fmt, "[{{{}}}]", results)
}
}
#[derive(Clone, Copy)]
pub struct CAAResultsIter<'a> {
next: Option<&'a c_ares_sys::ares_caa_reply>,
}
impl<'a> Iterator for CAAResultsIter<'a> {
type Item = CAAResult<'a>;
fn next(&mut self) -> Option<Self::Item> {
let opt_reply = self.next;
self.next = opt_reply.and_then(|reply| unsafe { reply.next.as_ref() });
opt_reply.map(|reply| CAAResult { caa_reply: reply })
}
}
impl<'a> IntoIterator for &'a CAAResults {
type Item = CAAResult<'a>;
type IntoIter = CAAResultsIter<'a>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
impl Drop for CAAResults {
fn drop(&mut self) {
unsafe { c_ares_sys::ares_free_data(self.caa_reply as *mut c_void) }
}
}
unsafe impl Send for CAAResults {}
unsafe impl Sync for CAAResults {}
unsafe impl<'a> Send for CAAResult<'a> {}
unsafe impl<'a> Sync for CAAResult<'a> {}
unsafe impl<'a> Send for CAAResultsIter<'a> {}
unsafe impl<'a> Sync for CAAResultsIter<'a> {}
impl<'a> CAAResult<'a> {
pub fn critical(self) -> bool {
self.caa_reply.critical != 0
}
pub fn property(self) -> &'a CStr {
unsafe { CStr::from_ptr(self.caa_reply.property as *const c_char) }
}
pub fn value(self) -> &'a CStr {
unsafe { CStr::from_ptr(self.caa_reply.value as *const c_char) }
}
}
impl<'a> fmt::Display for CAAResult<'a> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
write!(fmt, "Critical: {}, ", self.critical())?;
write!(
fmt,
"Property: {}, ",
self.property().to_str().unwrap_or("<not utf8>")
)?;
write!(
fmt,
"Value: {}",
self.value().to_str().unwrap_or("<not utf8>")
)
}
}
pub(crate) unsafe extern "C" fn query_caa_callback<F>(
arg: *mut c_void,
status: c_int,
_timeouts: c_int,
abuf: *mut c_uchar,
alen: c_int,
) where
F: FnOnce(Result<CAAResults>) + Send + 'static,
{
ares_callback!(arg as *mut F, status, abuf, alen, CAAResults::parse_from);
}