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//! DNS resolvers built on [`c-ares`](https://c-ares.haxx.se), 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 underlying `c-ares` library. It returns //! answers via callbacks. The other resolvers are built on top of this. //! //! * The `FutureResolver` returns answers as `std::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 the `c-ares` function `ares_query`, which "initiates //! a single-question DNS query". //! //! - methods like `search_xxx` correspond to the `c-ares` function `ares_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](https://c-ares.haxx.se/docs.html) for more details. //! //! # Example //! //! ```rust //! 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](https://github.com/dimbleby/c-ares-resolver/tree/master/examples). #![deny(missing_docs)] extern crate c_ares; extern crate crossbeam_channel; extern crate futures; extern crate polling; mod blockingresolver; mod error; mod eventloop; mod futureresolver; mod host; mod nameinfo; mod resolver; #[cfg(test)] mod tests; pub use crate::blockingresolver::BlockingResolver; pub use crate::error::Error; pub use crate::futureresolver::{CAresFuture, FutureResolver}; pub use crate::host::HostResults; pub use crate::nameinfo::NameInfoResult; pub use crate::resolver::{Options, Resolver};