psutil

type CPUInfoStat struct {
	System float64
	User   float64
	Idle   float64
	Other  float64
}

type MemoryInfoStat struct {
	Total     uint64
	Available uint64
	Used      uint64
}

type Process interface {
	CPUPercent() (*CPUInfoStat, error)
	VirtualMemory() (uint64, error)
	Stop()
}

type Util interface {
	Start()
	Stop()
	CPUCounts(logical bool) (float64, error)
	CPUPercent() (*CPUInfoStat, error)
	DiskUsage(path string) (*disk.UsageStat, error)
	VirtualMemory() (*MemoryInfoStat, error)
	NetIOCounters(pernic bool) ([]net.IOCountersStat, error)
	Process(pid int32) (Process, error)
}