open-consul/vendor/github.com/shirou/gopsutil/process/process.go

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package process
import (
"context"
"encoding/json"
"errors"
"runtime"
"sort"
"time"
"github.com/shirou/gopsutil/cpu"
"github.com/shirou/gopsutil/internal/common"
"github.com/shirou/gopsutil/mem"
)
var (
invoke common.Invoker = common.Invoke{}
ErrorNoChildren = errors.New("process does not have children")
ErrorProcessNotRunning = errors.New("process does not exist")
)
type Process struct {
Pid int32 `json:"pid"`
name string
status string
parent int32
numCtxSwitches *NumCtxSwitchesStat
uids []int32
gids []int32
numThreads int32
memInfo *MemoryInfoStat
sigInfo *SignalInfoStat
createTime int64
lastCPUTimes *cpu.TimesStat
lastCPUTime time.Time
tgid int32
}
type OpenFilesStat struct {
Path string `json:"path"`
Fd uint64 `json:"fd"`
}
type MemoryInfoStat struct {
RSS uint64 `json:"rss"` // bytes
VMS uint64 `json:"vms"` // bytes
HWM uint64 `json:"hwm"` // bytes
Data uint64 `json:"data"` // bytes
Stack uint64 `json:"stack"` // bytes
Locked uint64 `json:"locked"` // bytes
Swap uint64 `json:"swap"` // bytes
}
type SignalInfoStat struct {
PendingProcess uint64 `json:"pending_process"`
PendingThread uint64 `json:"pending_thread"`
Blocked uint64 `json:"blocked"`
Ignored uint64 `json:"ignored"`
Caught uint64 `json:"caught"`
}
type RlimitStat struct {
Resource int32 `json:"resource"`
Soft int32 `json:"soft"` //TODO too small. needs to be uint64
Hard int32 `json:"hard"` //TODO too small. needs to be uint64
Used uint64 `json:"used"`
}
type IOCountersStat struct {
ReadCount uint64 `json:"readCount"`
WriteCount uint64 `json:"writeCount"`
ReadBytes uint64 `json:"readBytes"`
WriteBytes uint64 `json:"writeBytes"`
}
type NumCtxSwitchesStat struct {
Voluntary int64 `json:"voluntary"`
Involuntary int64 `json:"involuntary"`
}
type PageFaultsStat struct {
MinorFaults uint64 `json:"minorFaults"`
MajorFaults uint64 `json:"majorFaults"`
ChildMinorFaults uint64 `json:"childMinorFaults"`
ChildMajorFaults uint64 `json:"childMajorFaults"`
}
// Resource limit constants are from /usr/include/x86_64-linux-gnu/bits/resource.h
// from libc6-dev package in Ubuntu 16.10
const (
RLIMIT_CPU int32 = 0
RLIMIT_FSIZE int32 = 1
RLIMIT_DATA int32 = 2
RLIMIT_STACK int32 = 3
RLIMIT_CORE int32 = 4
RLIMIT_RSS int32 = 5
RLIMIT_NPROC int32 = 6
RLIMIT_NOFILE int32 = 7
RLIMIT_MEMLOCK int32 = 8
RLIMIT_AS int32 = 9
RLIMIT_LOCKS int32 = 10
RLIMIT_SIGPENDING int32 = 11
RLIMIT_MSGQUEUE int32 = 12
RLIMIT_NICE int32 = 13
RLIMIT_RTPRIO int32 = 14
RLIMIT_RTTIME int32 = 15
)
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)
}
// Pids returns a slice of process ID list which are running now.
func Pids() ([]int32, error) {
return PidsWithContext(context.Background())
}
func PidsWithContext(ctx context.Context) ([]int32, error) {
pids, err := pidsWithContext(ctx)
sort.Slice(pids, func(i, j int) bool { return pids[i] < pids[j] })
return pids, err
}
// NewProcess creates a new Process instance, it only stores the pid and
// checks that the process exists. Other method on Process can be used
// to get more information about the process. An error will be returned
// if the process does not exist.
func NewProcess(pid int32) (*Process, error) {
p := &Process{Pid: pid}
exists, err := PidExists(pid)
if err != nil {
return p, err
}
if !exists {
return p, ErrorProcessNotRunning
}
p.CreateTime()
return p, nil
}
func PidExists(pid int32) (bool, error) {
return PidExistsWithContext(context.Background(), pid)
}
// Background returns true if the process is in background, false otherwise.
func (p *Process) Background() (bool, error) {
return p.BackgroundWithContext(context.Background())
}
func (p *Process) BackgroundWithContext(ctx context.Context) (bool, error) {
fg, err := p.ForegroundWithContext(ctx)
if err != nil {
return false, err
}
return !fg, 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) Percent(interval time.Duration) (float64, error) {
return p.PercentWithContext(context.Background(), interval)
}
func (p *Process) PercentWithContext(ctx context.Context, interval time.Duration) (float64, error) {
cpuTimes, err := p.Times()
if err != nil {
return 0, err
}
now := time.Now()
if interval > 0 {
p.lastCPUTimes = cpuTimes
p.lastCPUTime = now
time.Sleep(interval)
cpuTimes, err = p.Times()
now = time.Now()
if err != nil {
return 0, err
}
} else {
if p.lastCPUTimes == nil {
// invoked first time
p.lastCPUTimes = cpuTimes
p.lastCPUTime = now
return 0, nil
}
}
numcpu := runtime.NumCPU()
delta := (now.Sub(p.lastCPUTime).Seconds()) * float64(numcpu)
ret := calculatePercent(p.lastCPUTimes, cpuTimes, delta, numcpu)
p.lastCPUTimes = cpuTimes
p.lastCPUTime = now
return ret, nil
}
// IsRunning returns whether the process is still running or not.
func (p *Process) IsRunning() (bool, error) {
return p.IsRunningWithContext(context.Background())
}
func (p *Process) IsRunningWithContext(ctx context.Context) (bool, error) {
createTime, err := p.CreateTimeWithContext(ctx)
if err != nil {
return false, err
}
p2, err := NewProcess(p.Pid)
if err == ErrorProcessNotRunning {
return false, nil
}
createTime2, err := p2.CreateTimeWithContext(ctx)
if err != nil {
return false, err
}
return createTime == createTime2, nil
}
// CreateTime returns created time of the process in milliseconds since the epoch, in UTC.
func (p *Process) CreateTime() (int64, error) {
return p.CreateTimeWithContext(context.Background())
}
func (p *Process) CreateTimeWithContext(ctx context.Context) (int64, error) {
if p.createTime != 0 {
return p.createTime, nil
}
createTime, err := p.createTimeWithContext(ctx)
p.createTime = createTime
return p.createTime, err
}
func calculatePercent(t1, t2 *cpu.TimesStat, delta float64, numcpu int) float64 {
if delta == 0 {
return 0
}
delta_proc := t2.Total() - t1.Total()
overall_percent := ((delta_proc / delta) * 100) * float64(numcpu)
return overall_percent
}
// MemoryPercent returns how many percent of the total RAM this process uses
func (p *Process) MemoryPercent() (float32, error) {
return p.MemoryPercentWithContext(context.Background())
}
func (p *Process) MemoryPercentWithContext(ctx context.Context) (float32, error) {
machineMemory, err := mem.VirtualMemory()
if err != nil {
return 0, err
}
total := machineMemory.Total
processMemory, err := p.MemoryInfo()
if err != nil {
return 0, err
}
used := processMemory.RSS
return (100 * float32(used) / float32(total)), nil
}
// CPU_Percent returns how many percent of the CPU time this process uses
func (p *Process) CPUPercent() (float64, error) {
return p.CPUPercentWithContext(context.Background())
}
func (p *Process) CPUPercentWithContext(ctx context.Context) (float64, error) {
crt_time, err := p.CreateTime()
if err != nil {
return 0, err
}
cput, err := p.Times()
if err != nil {
return 0, err
}
created := time.Unix(0, crt_time*int64(time.Millisecond))
totalTime := time.Since(created).Seconds()
if totalTime <= 0 {
return 0, nil
}
return 100 * cput.Total() / totalTime, nil
}