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type Logger interface {
	Debug(s string)
	Info(s string)
	Warner
	Error(s string)
}

type Metrics interface {
	DoTDialInc(provider, address, outcome string)
	DNSDialInc(address, outcome string)
}

type Middleware interface {
	String() string
	Wrap(next dns.Handler) dns.Handler
	Stop() (err error)
}

type ResolverSettings struct {
	// UpstreamResolvers is a list of DNS over TLS upstream resolvers
	// to use.
	UpstreamResolvers []provider.Provider
	// Timeout is the maximum duration to wait for a response from
	// upstream DNS over TLS servers. If left unset, it defaults to
	// 5 seconds.
	Timeout time.Duration
	// IPVersion defines the only IP version to use to connect to
	// upstream DNS over TLS servers. If left unset, it defaults to
	// "ipv4".
	IPVersion string
	// Warner is the warning logger to log dial errors.
	// It defaults to a No-Op warner implementation.
	Warner Warner
	// Metrics is the metrics interface to record metric data.
	// It defaults to a No-Op metrics implementation.
	Metrics Metrics
}

type Server struct {
	// contains filtered or unexported fields
}

type ServerSettings struct {
	Resolver         ResolverSettings
	ListeningAddress *string
	// Middlewares is a list of middlewares to use.
	// The first one is the first wrapper, and the last one
	// is the last wrapper of the handlers in the chain.
	Middlewares []Middleware
	// Logger is the logger to log information.
	// It defaults to a No-Op logger implementation.
	Logger Logger
}

type Warner interface {
	Warn(s string)
}