AutostartDNS creates a ConfigOption which will set the UDP server (DNS) to start listening when the app is executed (alongside the HTTP server), or to wait for a HTTP request against /dns/start.

ConfigPath creates a ConfigOption setting the Config's path to string `t` It tries to call os.Stat() on string `p` to evaluate if the file exists.

ConfigType creates a ConfigOption setting the Config's type to string `t` It defaults to `yaml`.

Default returns a pointer to a Config, initialized with sane defaults and ready for automatic start-up.

DNSAddress creates a ConfigOption setting the Config's DNS address to string `a` It the string `a` is an invalid IP address, it returns `nil`.

DNSFallback creates a ConfigOption setting the Config's fallback DNS address(es) to string `f` It the string `f` is empty, it returns `nil`.

DNSPrefix creates a ConfigOption setting the Config's DNS prefix to string `p` It the string `p` is longer than one character, the first rune is converted to a string and that one is used.

DNSProto creates a ConfigOption setting the Config's DNS proto to string `p` It defaults to `udp`.

DNSType creates a ConfigOption setting the Config's DNS type to string `t` It defaults to `miekgdns`.

HealthType creates a ConfigOption setting the Config's health check type to string `t` It defaults to `simplehealth`.

HTTPPort creates a ConfigOption setting the Config's HTTP port to int `p` It returns nil if the input port `p` is 0 or over 65535, otherwise it will return a ConfigOption to update the HTTP port.

LoggerPath creates a ConfigOption setting the Config's logfile path to string `p` It tries to call os.Stat() on string `p` to evaluate if the file exists.

LoggerType creates a ConfigOption setting the Config's logger type to string `t` It defaults to `text`.

Merge combines Configs `main` with `input`, returning a merged version of the two All set elements in `input` will be applied to `main`, and the unset elements will be ignored (keeps `main`'s data).

New initializes a new config with default settings, and then iterates through all input ConfigOption `opts` applying them to the Config, which is returned to the caller.

StorePath creates a ConfigOption setting the Config's store path to string `p` It tries to call os.Stat() on string `p` to evaluate if the file exists.

StoreType creates a ConfigOption setting the Config's store type to string `t` It defaults to `memmap`.

Config structures the setup of the DNS app, according to the caller's needs This information can also be stored and loaded in a file for quicker access in future executions.

ConfigOption describes setter types for a Config As new options / elements are added to the Config, new data structures can implement the ConfigOption interface to allow setting these options in the Config.