version

type Compatibility interface {
	// Returns the local version
	Version() Version

	// Returns nil if the provided version is able to connect with the local
	// version. This means that the node will keep connections open with the
	// peer.
	Connectable(Version) error

	// Returns nil if the provided version is compatible with the local version.
	// This means that the version is connectable and that consensus messages
	// can be made to them.
	Compatible(Version) error

	// Returns nil if the provided version shouldn't be masked. This means that
	// the version is connectable but not compatible. The version is so old that
	// it should just be masked.
	Unmaskable(Version) error

	// Returns nil if the provided version will not be masked by this version.
	WontMask(Version) error

	// Returns when additional masking will occur.
	MaskTime() time.Time
}

type Parser interface {
	Parse(string) (Version, error)
}

type Version interface {
	fmt.Stringer

	App() string
	Major() int
	Minor() int
	Patch() int

	Compatible(Version) error
	Before(Version) bool
}