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nameinfo.rs
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nameinfo.rs
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use std::ffi::CStr;
use std::fmt;
use std::os::raw::{
c_char,
c_int,
c_void,
};
use std::str;
use c_ares_sys;
use error::{
Error,
Result,
};
use panic;
/// The result of a successful name-info lookup.
#[derive(Clone, Copy, Debug)]
pub struct NameInfoResult<'a> {
node: Option<&'a c_char>,
service: Option<&'a c_char>,
}
impl<'a> NameInfoResult<'a> {
fn new(
node: Option<&'a c_char>,
service: Option<&'a c_char>) -> NameInfoResult<'a> {
NameInfoResult {
node: node,
service: service,
}
}
/// Returns the node from this `NameInfoResult`.
pub fn node(&self) -> Option<&str> {
self.node.map(|string| {
unsafe {
let c_str = CStr::from_ptr(string);
str::from_utf8_unchecked(c_str.to_bytes())
}
})
}
/// Returns the service from this `NameInfoResult`.
pub fn service(&self) -> Option<&str> {
self.service.map(|string| {
unsafe {
let c_str = CStr::from_ptr(string);
str::from_utf8_unchecked(c_str.to_bytes())
}
})
}
}
impl<'a> fmt::Display for NameInfoResult<'a> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
let node = self.node().unwrap_or("<None>");
write!(fmt, "Node: {}, ", node)?;
let service = self.service().unwrap_or("<None>");
write!(fmt, "Service: {}", service)?;
Ok(())
}
}
unsafe impl<'a> Send for NameInfoResult<'a> { }
unsafe impl<'a> Sync for NameInfoResult<'a> { }
pub unsafe extern "C" fn get_name_info_callback<F>(
arg: *mut c_void,
status: c_int,
_timeouts: c_int,
node: *mut c_char,
service: *mut c_char)
where F: FnOnce(Result<NameInfoResult>) + Send + 'static {
panic::catch(|| {
let result = if status == c_ares_sys::ARES_SUCCESS {
let name_info_result = NameInfoResult::new(
node.as_ref(),
service.as_ref());
Ok(name_info_result)
} else {
Err(Error::from(status))
};
let handler = Box::from_raw(arg as *mut F);
handler(result);
});
}