Struct Forward

plugin/forward/forward.go:36–73

Forward represents a plugin instance that can proxy requests to another (DNS) server. It has a list of proxies each representing one upstream proxy.

// Forward represents a plugin instance that can proxy requests to another (DNS) server. It has a list
// of proxies each representing one upstream proxy.
type Forward struct {
	concurrent int64 // atomic counters need to be first in struct for proper alignment

	proxies    []*proxyPkg.Proxy
	p          Policy
	hcInterval time.Duration

	from    string
	ignored []string

	nextAlternateRcodes []int
	nextOnNodata        bool

	tlsConfig                  *tls.Config
	tlsServerName              string
	maxfails                   uint32
	expire                     time.Duration
	maxAge                     time.Duration
	maxIdleConns               int
	maxConcurrent              int64
	failfastUnhealthyUpstreams bool
	failoverRcodes             []int
	maxConnectAttempts         uint32

	// Hostname resolution fields
	resolver  []string  // custom resolver IPs for hostname TO resolution
	toEntries []toEntry // ordered TO entries preserving config order

	opts proxyPkg.Options // also here for testing

	// ErrLimitExceeded indicates that a query was rejected because the number of concurrent queries has exceeded
	// the maximum allowed (maxConcurrent)
	ErrLimitExceeded error

	tapPlugins []*dnstap.Dnstap // when dnstap plugins are loaded, we use to this to send messages out.

	Next plugin.Handler
}

// New returns a new Forward.
func New() *Forward {