Struct DnsResolver 

pub struct DnsResolver(/* private fields */);

Available on non-wasm_browser only.

The DNS resolver used throughout iroh.

Implementations

impl DnsResolver

pub fn new() -> Self

Creates a new DNS resolver with sensible cross-platform defaults.

We first try to read the system’s resolver from /etc/resolv.conf. This does not work at least on some Androids, therefore we fallback to the default ResolverConfig which uses eg. to google’s 8.8.8.8 or 8.8.4.4.

pub fn with_nameserver(nameserver: SocketAddr) -> Self

Creates a new DNS resolver configured with a single UDP DNS nameserver.

pub fn builder() -> Builder

Creates a builder to construct a DNS resolver with custom options.

pub fn custom(resolver: impl Resolver) -> Self

Creates a new DnsResolver from a struct that implements Resolver.

If you need more customization for DNS resolving than the Builder allows, you can implement the Resolver trait on a struct and implement DNS resolution however you see fit.

pub async fn clear_cache(&self)

Removes all entries from the cache.

pub async fn reset(&self)

Recreates the inner resolver.

pub async fn lookup_txt<T: ToString>( &self, host: T, timeout: Duration, ) -> Result<impl Iterator<Item = TxtRecordData>, DnsError>

Looks up a TXT record.

pub async fn lookup_ipv4<T: ToString>( &self, host: T, timeout: Duration, ) -> Result<impl Iterator<Item = IpAddr> + use<T>, DnsError>

Performs an IPv4 lookup with a timeout.

pub async fn lookup_ipv6<T: ToString>( &self, host: T, timeout: Duration, ) -> Result<impl Iterator<Item = IpAddr> + use<T>, DnsError>

Performs an IPv6 lookup with a timeout.

pub async fn lookup_ipv4_ipv6<T: ToString>( &self, host: T, timeout: Duration, ) -> Result<impl Iterator<Item = IpAddr> + use<T>, DnsError>

Resolves IPv4 and IPv6 in parallel with a timeout.

LookupIpStrategy::Ipv4AndIpv6 will wait for ipv6 resolution timeout, even if it is not usable on the stack, so we manually query both lookups concurrently and time them out individually.

pub async fn resolve_host( &self, url: &Url, prefer_ipv6: bool, timeout: Duration, ) -> Result<IpAddr, DnsError>

Resolves a hostname from a URL to an IP address.

pub async fn lookup_ipv4_staggered( &self, host: impl ToString, timeout: Duration, delays_ms: &[u64], ) -> Result<impl Iterator<Item = IpAddr>, StaggeredError<DnsError>>

Performs an IPv4 lookup with a timeout in a staggered fashion.

From the moment this function is called, each lookup is scheduled after the delays in delays_ms with the first call being done immediately. [200ms, 300ms] results in calls at T+0ms, T+200ms and T+300ms. The timeout is applied to each call individually. The result of the first successful call is returned, or a summary of all errors otherwise.

pub async fn lookup_ipv6_staggered( &self, host: impl ToString, timeout: Duration, delays_ms: &[u64], ) -> Result<impl Iterator<Item = IpAddr>, StaggeredError<DnsError>>

Performs an IPv6 lookup with a timeout in a staggered fashion.

From the moment this function is called, each lookup is scheduled after the delays in delays_ms with the first call being done immediately. [200ms, 300ms] results in calls at T+0ms, T+200ms and T+300ms. The timeout is applied to each call individually. The result of the first successful call is returned, or a summary of all errors otherwise.

pub async fn lookup_ipv4_ipv6_staggered( &self, host: impl ToString, timeout: Duration, delays_ms: &[u64], ) -> Result<impl Iterator<Item = IpAddr>, StaggeredError<DnsError>>

Races an IPv4 and IPv6 lookup with a timeout in a staggered fashion.

From the moment this function is called, each lookup is scheduled after the delays in delays_ms with the first call being done immediately. [200ms, 300ms] results in calls at T+0ms, T+200ms and T+300ms. The timeout is applied as stated in Self::lookup_ipv4_ipv6. The result of the first successful call is returned, or a summary of all errors otherwise.

pub async fn lookup_endpoint_by_id( &self, endpoint_id: &EndpointId, origin: &str, ) -> Result<EndpointInfo, LookupError>

Looks up endpoint info by EndpointId and origin domain name.

To lookup endpoints that published their endpoint info to the DNS servers run by n0, pass N0_DNS_ENDPOINT_ORIGIN_PROD as origin.

pub async fn lookup_endpoint_by_domain_name( &self, name: &str, ) -> Result<EndpointInfo, LookupError>

Looks up endpoint info by DNS name.

pub async fn lookup_endpoint_by_domain_name_staggered( &self, name: &str, delays_ms: &[u64], ) -> Result<EndpointInfo, StaggeredError<LookupError>>

Looks up endpoint info by DNS name in a staggered fashion.

From the moment this function is called, each lookup is scheduled after the delays in delays_ms with the first call being done immediately. [200ms, 300ms] results in calls at T+0ms, T+200ms and T+300ms. The result of the first successful call is returned, or a summary of all errors otherwise.

pub async fn lookup_endpoint_by_id_staggered( &self, endpoint_id: &EndpointId, origin: &str, delays_ms: &[u64], ) -> Result<EndpointInfo, StaggeredError<LookupError>>

Looks up endpoint info by EndpointId and origin domain name.

From the moment this function is called, each lookup is scheduled after the delays in delays_ms with the first call being done immediately. [200ms, 300ms] results in calls at T+0ms, T+200ms and T+300ms. The result of the first successful call is returned, or a summary of all errors otherwise.

Trait Implementations

impl Clone for DnsResolver

fn clone(&self) -> DnsResolver

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DnsResolver

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for DnsResolver

fn default() -> Self

Returns the “default value” for a type.

impl Resolve for DnsResolver

fn resolve(&self, name: Name) -> Resolving

Performs DNS resolution on a Name. The return type is a future containing an iterator of SocketAddr.