telegraf/plugins/inputs/procstat/process.go

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package procstat
import (
"fmt"
"time"
"github.com/shirou/gopsutil/cpu"
"github.com/shirou/gopsutil/process"
)
type Process interface {
PID() PID
Tags() map[string]string
IOCounters() (*process.IOCountersStat, error)
MemoryInfo() (*process.MemoryInfoStat, error)
Name() (string, error)
NumCtxSwitches() (*process.NumCtxSwitchesStat, error)
NumFDs() (int32, error)
NumThreads() (int32, error)
Percent(interval time.Duration) (float64, error)
Times() (*cpu.TimesStat, error)
RlimitUsage(bool) ([]process.RlimitStat, error)
}
type Proc struct {
hasCPUTimes bool
tags map[string]string
*process.Process
}
func NewProc(pid PID) (Process, error) {
process, err := process.NewProcess(int32(pid))
if err != nil {
return nil, err
}
proc := &Proc{
Process: process,
hasCPUTimes: false,
tags: make(map[string]string),
}
return proc, nil
}
func (p *Proc) Tags() map[string]string {
return p.tags
}
func (p *Proc) PID() PID {
return PID(p.Process.Pid)
}
func (p *Proc) Percent(interval time.Duration) (float64, error) {
cpu_perc, err := p.Process.Percent(time.Duration(0))
if !p.hasCPUTimes && err == nil {
p.hasCPUTimes = true
return 0, fmt.Errorf("Must call Percent twice to compute percent cpu.")
}
return cpu_perc, err
}