package process import ( "encoding/json" "runtime" "time" cpu "github.com/shirou/gopsutil/cpu" ) type Process struct { Pid int32 `json:"pid"` name string status string numCtxSwitches *NumCtxSwitchesStat uids []int32 gids []int32 numThreads int32 memInfo *MemoryInfoStat lastCPUTimes *cpu.CPUTimesStat lastCPUTime time.Time } type OpenFilesStat struct { Path string `json:"path"` Fd uint64 `json:"fd"` } type MemoryInfoStat struct { RSS uint64 `json:"rss"` // bytes VMS uint64 `json:"vms"` // bytes Swap uint64 `json:"swap"` // bytes } type RlimitStat struct { Resource int32 `json:"resource"` Soft int32 `json:"soft"` Hard int32 `json:"hard"` } type IOCountersStat struct { ReadCount uint64 `json:"read_count"` WriteCount uint64 `json:"write_count"` ReadBytes uint64 `json:"read_bytes"` WriteBytes uint64 `json:"write_bytes"` } type NumCtxSwitchesStat struct { Voluntary int64 `json:"voluntary"` Involuntary int64 `json:"involuntary"` } func (p Process) String() string { s, _ := json.Marshal(p) return string(s) } func (o OpenFilesStat) String() string { s, _ := json.Marshal(o) return string(s) } func (m MemoryInfoStat) String() string { s, _ := json.Marshal(m) return string(s) } func (r RlimitStat) String() string { s, _ := json.Marshal(r) return string(s) } func (i IOCountersStat) String() string { s, _ := json.Marshal(i) return string(s) } func (p NumCtxSwitchesStat) String() string { s, _ := json.Marshal(p) return string(s) } func PidExists(pid int32) (bool, error) { pids, err := Pids() if err != nil { return false, err } for _, i := range pids { if i == pid { return true, err } } return false, err } // If interval is 0, return difference from last call(non-blocking). // If interval > 0, wait interval sec and return diffrence between start and end. func (p *Process) CPUPercent(interval time.Duration) (float64, error) { numcpu := runtime.NumCPU() calculate := func(t1, t2 *cpu.CPUTimesStat, delta float64) float64 { if delta == 0 { return 0 } delta_proc := (t2.User - t1.User) + (t2.System - t1.System) overall_percent := ((delta_proc / delta) * 100) * float64(numcpu) return overall_percent } cpuTimes, err := p.CPUTimes() if err != nil { return 0, err } if interval > 0 { p.lastCPUTimes = cpuTimes p.lastCPUTime = time.Now() time.Sleep(interval) cpuTimes, err = p.CPUTimes() if err != nil { return 0, err } } else { if p.lastCPUTimes == nil { // invoked first time p.lastCPUTimes, err = p.CPUTimes() if err != nil { return 0, err } p.lastCPUTime = time.Now() return 0, nil } } delta := (time.Now().Sub(p.lastCPUTime).Seconds()) * float64(numcpu) ret := calculate(p.lastCPUTimes, cpuTimes, float64(delta)) p.lastCPUTimes = cpuTimes p.lastCPUTime = time.Now() return ret, nil }