var EnableSRVLookups … var MinResolutionInterval … var ResolvingTimeout … var logger … func init() { … } const defaultPort … const defaultDNSSvrPort … const golang … const txtPrefix … const txtAttribute … var addressDialer … var newNetResolver … // NewBuilder creates a dnsBuilder which is used to factory DNS resolvers. func NewBuilder() resolver.Builder { … } type dnsBuilder … // Build creates and starts a DNS resolver that watches the name resolution of // the target. func (b *dnsBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) { … } // Scheme returns the naming scheme of this resolver builder, which is "dns". func (b *dnsBuilder) Scheme() string { … } type deadResolver … func (deadResolver) ResolveNow(resolver.ResolveNowOptions) { … } func (deadResolver) Close() { … } type dnsResolver … // ResolveNow invoke an immediate resolution of the target that this // dnsResolver watches. func (d *dnsResolver) ResolveNow(resolver.ResolveNowOptions) { … } // Close closes the dnsResolver. func (d *dnsResolver) Close() { … } func (d *dnsResolver) watcher() { … } func (d *dnsResolver) lookupSRV(ctx context.Context) ([]resolver.Address, error) { … } func handleDNSError(err error, lookupType string) error { … } func (d *dnsResolver) lookupTXT(ctx context.Context) *serviceconfig.ParseResult { … } func (d *dnsResolver) lookupHost(ctx context.Context) ([]resolver.Address, error) { … } func (d *dnsResolver) lookup() (*resolver.State, error) { … } // formatIP returns ok = false if addr is not a valid textual representation of // an IP address. If addr is an IPv4 address, return the addr and ok = true. // If addr is an IPv6 address, return the addr enclosed in square brackets and // ok = true. func formatIP(addr string) (addrIP string, ok bool) { … } // parseTarget takes the user input target string and default port, returns // formatted host and port info. If target doesn't specify a port, set the port // to be the defaultPort. If target is in IPv6 format and host-name is enclosed // in square brackets, brackets are stripped when setting the host. // examples: // target: "www.google.com" defaultPort: "443" returns host: "www.google.com", port: "443" // target: "ipv4-host:80" defaultPort: "443" returns host: "ipv4-host", port: "80" // target: "[ipv6-host]" defaultPort: "443" returns host: "ipv6-host", port: "443" // target: ":80" defaultPort: "443" returns host: "localhost", port: "80" func parseTarget(target, defaultPort string) (host, port string, err error) { … } type rawChoice … func containsString(a *[]string, b string) bool { … } func chosenByPercentage(a *int) bool { … } func canaryingSC(js string) string { … }
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