[−][src]Struct trust_dns_resolver::AsyncResolver

pub struct AsyncResolver { /* fields omitted */ }

A handle for resolving DNS records.

Creating a AsyncResolver returns a new handle and a future that should be spawned on an executor to drive the background work. The lookup methods on AsyncResolver request lookups from the background task.

The futures returned by a AsyncResolver and the corresponding background task need not be spawned on the same executor, or be in the same thread. Additionally, one background task may have any number of handles; calling clone() on a handle will create a new handle linked to the same background task.

NOTE If lookup futures returned by a AsyncResolver and the background future are spawned on two separate CurrentThread executors, one thread cannot run both executors simultaneously, so the run or block_on functions will cause the thread to deadlock. If both the background work and the lookup futures are intended to be run on the same thread, they should be spawned on the same executor.

The background task manages the name server pool and other state used to drive lookups. When this future is spawned on an executor, it will first construct and configure the necessary client state, before checking for any incoming lookup requests, handling them, and yielding. It will continue to do so as long as there are still any AsyncResolver handle linked to it. When all of its AsyncResolvers have been dropped, the background future will finish.

Methods

`impl AsyncResolver`[src]

`pub fn new( config: ResolverConfig, options: ResolverOpts ) -> (Self, impl Future<Output = ()> + Send)`[src]

Construct a new AsyncResolver with the provided configuration.

Arguments

config - configuration, name_servers, etc. for the Resolver
options - basic lookup options for the resolver

Returns

A tuple containing the new AsyncResolver and a future that drives the background task that runs resolutions for the AsyncResolver. See the documentation for AsyncResolver for more information on how to use the background future.

`pub fn from_system_conf() -> ResolveResult<(Self, impl Future<Output = ()>)>`[src]

Constructs a new Resolver with the system configuration.

This will use /etc/resolv.conf on Unix OSes and the registry on Windows.

`pub fn lookup<N: IntoName>( &self, name: N, record_type: RecordType ) -> BackgroundLookup`[src]

Generic lookup for any RecordType

WARNING this interface may change in the future, see if one of the specializations would be better.

Arguments

name - name of the record to lookup, if name is not a valid domain name, an error will be returned
record_type - type of record to lookup, all RecordData responses will be filtered to this type

Returns

`pub fn lookup_ip<N: IntoName + TryParseIp>(&self, host: N) -> BackgroundLookupIp`[src]

Performs a dual-stack DNS lookup for the IP for the given hostname.

See the configuration and options parameters for controlling the way in which A(Ipv4) and AAAA(Ipv6) lookups will be performed. For the least expensive query a fully-qualified-domain-name, FQDN, which ends in a final ., e.g. www.example.com., will only issue one query. Anything else will always incur the cost of querying the ResolverConfig::domain and ResolverConfig::search.

Arguments

host - string hostname, if this is an invalid hostname, an error will be returned.

`pub fn lookup_service( &self, service: &str, protocol: &str, name: &str ) -> BackgroundLookup<SrvLookupFuture>`[src]

Deprecated:

use lookup_srv instead, this interface is not ideal

Performs a DNS lookup for an SRV record for the specified service type and protocol at the given name.

This is a convenience method over lookup_srv, it combines the service, protocol and name into a single name: _service._protocol.name.

Arguments

service - service to lookup, e.g. ldap or http
protocol - wire protocol, e.g. udp or tcp
name - zone or other name at which the service is located.