resolver

Documentation

Overview

Package resolver provides a caching, non-blocking DNS resolver. All requests for cached resources are returned immediately and if cache has expired, an offline goroutine is fired to update it.

Index

• type Resolver
  • func New() *Resolver
  • func (r *Resolver) Resolve(name string, ipVer int) (net.IP, error)
  • func (r *Resolver) ResolveWithMaxAge(name string, ipVer int, maxAge time.Duration) (net.IP, error)

Types

type Resolver

type Resolver struct {
	DefaultMaxAge time.Duration
	// contains filtered or unexported fields
}

Resolver provides an asynchronous caching DNS resolver.

func New

func New() *Resolver

New returns a new Resolver.

func (*Resolver) Resolve

func (r *Resolver) Resolve(name string, ipVer int) (net.IP, error)

Resolve returns IP address for a name. It's same as ResolveWithMaxAge, except for that it uses DefaultMaxAge for validating the cache record.

func (*Resolver) ResolveWithMaxAge

func (r *Resolver) ResolveWithMaxAge(name string, ipVer int, maxAge time.Duration) (net.IP, error)

ResolveWithMaxAge returns IP address for a name, issuing an update call for the cache record if it's older than the argument maxAge.