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