[−][src]Crate c_ares_resolver
DNS resolvers built on c-ares
, for asynchronous DNS requests.
This crate provides three resolver types - the Resolver
, the FutureResolver
, and the
BlockingResolver
:
-
The
Resolver
is the thinnest wrapper around the underlyingc-ares
library. It returns answers via callbacks. The other resolvers are built on top of this. -
The
FutureResolver
returns answers asstd::future::Future
s. -
The
BlockingResolver
isn't asynchronous at all - as the name suggests, it blocks until the lookup completes.
On all resolvers:
-
methods like
query_xxx
correspond to thec-ares
functionares_query
, which "initiates a single-question DNS query". -
methods like
search_xxx
correspond to thec-ares
functionares_search
, which "initiates a series of single-question DNS queries ... using the channel's search domains as well as a host alias file given by the HOSTALIAS environment variable".
See c-ares
documentation for more details.
Example
extern crate c_ares_resolver; extern crate futures; use futures::executor::block_on; fn main() { let resolver = c_ares_resolver::FutureResolver::new().unwrap(); let query = resolver.query_a("google.com"); let response = block_on(query); match response { Ok(result) => println!("{}", result), Err(e) => println!("Lookup failed with error '{}'", e) } }
Further examples showing how to use the library can be found here.
Structs
BlockingResolver | A blocking DNS resolver. |
CAresFuture | The type of future returned by methods on the |
FutureResolver | An asynchronous DNS resolver, which returns results as |
HostResults | An owned version of |
NameInfoResult | An owned version of |
Options | Used to configure the behaviour of the resolver. |
Resolver | An asynchronous DNS resolver, which returns results via callbacks. |
Enums
Error | Error codes that the library might return. |