Struct c_ares_resolver::FutureResolver

pub struct FutureResolver { /* private fields */ }

An asynchronous DNS resolver, which returns results as futures::Futures.

Note that dropping the FutureResolver does not cause outstanding queries to fail - contrast the Resolver - because the returned futures hold a reference to the underlying resolver.

Implementations

impl FutureResolver

pub fn new() -> Result<Self, Error>

Create a new FutureResolver, using default Options.

pub fn with_options(options: Options) -> Result<Self, Error>

Create a new FutureResolver, with the given Options.

pub fn set_servers(&self, servers: &[&str]) -> Result<&Self>

Set the list of servers to contact, instead of the servers specified in resolv.conf or the local named.

String format is host[:port]. IPv6 addresses with ports require square brackets eg [2001:4860:4860::8888]:53.

pub fn set_local_ipv4(&self, ipv4: Ipv4Addr) -> &Self

Set the local IPv4 address from which to make queries.

pub fn set_local_ipv6(&self, ipv6: &Ipv6Addr) -> &Self

Set the local IPv6 address from which to make queries.

pub fn set_local_device(&self, device: &str) -> &Self

Set the local device from which to make queries.

pub fn set_sortlist(&self, sortlist: &[&str]) -> Result<&Self>

Initializes an address sortlist configuration, so that addresses returned by get_host_by_name() are sorted according to the sortlist.

Each element of the sortlist holds an IP-address/netmask pair. The netmask is optional but follows the address after a slash if present. For example: “130.155.160.0/255.255.240.0”, or “130.155.0.0”.

pub fn query_a(&self, name: &str) -> CAresFuture<AResults>

Look up the A records associated with name.

pub fn search_a(&self, name: &str) -> CAresFuture<AResults>

Search for the A records associated with name.

pub fn query_aaaa(&self, name: &str) -> CAresFuture<AAAAResults>

Look up the AAAA records associated with name.

pub fn search_aaaa(&self, name: &str) -> CAresFuture<AAAAResults>

Search for the AAAA records associated with name.

pub fn query_caa(&self, name: &str) -> CAresFuture<CAAResults>

Look up the CAA records associated with name.

pub fn search_caa(&self, name: &str) -> CAresFuture<CAAResults>

Search for the CAA records associated with name.

pub fn query_cname(&self, name: &str) -> CAresFuture<CNameResults>

Look up the CNAME records associated with name.

pub fn search_cname(&self, name: &str) -> CAresFuture<CNameResults>

Search for the CNAME records associated with name.

pub fn query_mx(&self, name: &str) -> CAresFuture<MXResults>

Look up the MX records associated with name.

pub fn search_mx(&self, name: &str) -> CAresFuture<MXResults>

Search for the MX records associated with name.

pub fn query_naptr(&self, name: &str) -> CAresFuture<NAPTRResults>

Look up the NAPTR records associated with name.

pub fn search_naptr(&self, name: &str) -> CAresFuture<NAPTRResults>

Search for the NAPTR records associated with name.

pub fn query_ns(&self, name: &str) -> CAresFuture<NSResults>

Look up the NS records associated with name.

pub fn search_ns(&self, name: &str) -> CAresFuture<NSResults>

Search for the NS records associated with name.

pub fn query_ptr(&self, name: &str) -> CAresFuture<PTRResults>

Look up the PTR records associated with name.

pub fn search_ptr(&self, name: &str) -> CAresFuture<PTRResults>

Search for the PTR records associated with name.

pub fn query_soa(&self, name: &str) -> CAresFuture<SOAResult>

Look up the SOA records associated with name.

pub fn search_soa(&self, name: &str) -> CAresFuture<SOAResult>

Search for the SOA records associated with name.

pub fn query_srv(&self, name: &str) -> CAresFuture<SRVResults>

Look up the SRV records associated with name.

pub fn search_srv(&self, name: &str) -> CAresFuture<SRVResults>

Search for the SRV records associated with name.

pub fn query_txt(&self, name: &str) -> CAresFuture<TXTResults>

Look up the TXT records associated with name.

pub fn search_txt(&self, name: &str) -> CAresFuture<TXTResults>

Search for the TXT records associated with name.

pub fn query_uri(&self, name: &str) -> CAresFuture<URIResults>

Look up the URI records associated with name.

pub fn search_uri(&self, name: &str) -> CAresFuture<URIResults>

Search for the URI records associated with name.

pub fn get_host_by_address(&self, address: &IpAddr) -> CAresFuture<HostResults>

Perform a host query by address.

This method is one of the very few places where this library performs strictly more allocation than the underlying c-ares code. If this is a problem for you, you should prefer to use the analogous method on the Resolver.

pub fn get_host_by_name(
    &self,
    name: &str,
    family: AddressFamily
) -> CAresFuture<HostResults>

Perform a host query by name.

This method is one of the very few places where this library performs strictly more allocation than the underlying c-ares code. If this is a problem for you, you should prefer to use the analogous method on the Resolver.

pub fn get_name_info<F>(
    &self,
    address: &SocketAddr,
    flags: NIFlags
) -> CAresFuture<NameInfoResult>

Address-to-nodename translation in protocol-independent manner.

This method is one of the very few places where this library performs strictly more allocation than the underlying c-ares code. If this is a problem for you, you should prefer to use the analogous method on the Resolver.

pub fn query(
    &self,
    name: &str,
    dns_class: u16,
    query_type: u16
) -> CAresFuture<Vec<u8>>

Initiate a single-question DNS query for name. The class and type of the query are per the provided parameters, taking values as defined in arpa/nameser.h.

This method is one of the very few places where this library performs strictly more allocation than the underlying c-ares code. If this is a problem for you, you should prefer to use the analogous method on the Resolver.

This method is provided so that users can query DNS types for which c-ares does not provide a parser; or in case a third-party parser is preferred. Usually, if a suitable query_xxx() is available, that should be used.

pub fn search(
    &self,
    name: &str,
    dns_class: u16,
    query_type: u16
) -> CAresFuture<Vec<u8>>

Initiate a series of single-question DNS queries for name. The class and type of the query are per the provided parameters, taking values as defined in arpa/nameser.h.

This method is one of the very few places where this library performs strictly more allocation than the underlying c-ares code. If this is a problem for you, you should prefer to use the analogous method on the Resolver.

This method is provided so that users can search DNS types for which c-ares does not provide a parser; or in case a third-party parser is preferred. Usually, if a suitable search_xxx() is available, that should be used.

pub fn cancel(&self)

Cancel all requests made on this FutureResolver.