online

type Check interface {
	Execute(timeout time.Duration) Result
}

type CheckGroup struct {
	Checks  []Check
	Results []Result
}

type ICMPCheck struct {
	Host string
}

type Printer struct {
	Output              io.Writer
	Verbose             bool
	ConsecutiveFailures int
	Streak              map[string]*Streak
}

type Result struct {
	// Time denotes the time the check completed
	Done time.Time

	// Took contains how long it took
	Took time.Duration

	// Okay is true if the check succeeded
	Okay bool

	// Consecutive is the number of results that came before with the same
	// result, including this one (i.e., it starts at 1).
	Consecutive int

	// Duration since the last time the result changed to ok, or from ok.
	Duration time.Duration

	// Hints contains a textual representation of the result
	Hints []string

	// Target identifies the target this result was run on
	Target *Target
}

type Streak struct {
	LongestOutage        time.Duration
	LongestFailureStreak int
}

type TCPCheck struct {
	Host string
	Port uint16
}

type Target struct {

	// ID is the unique name or address of the target
	ID string

	// Label is an optional identifier
	Label string

	// Address points at the address of the host
	Host string

	// Check that determines whether the target is online
	Check Check
}

type Watch struct {
	Targets  []string
	NoTCP    bool
	NoICMP   bool
	Verbose  bool
	Timeout  int
	Interval int
	Port     int
}