telegraf/plugins/inputs/procstat/procstat.go

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package procstat
import (
"fmt"
"io/ioutil"
"log"
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"os/exec"
"strconv"
"strings"
"github.com/shirou/gopsutil/process"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
type Procstat struct {
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PidFile string `toml:"pid_file"`
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Exe string
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Pattern string
Prefix string
pidmap map[int32]*process.Process
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}
func NewProcstat() *Procstat {
return &Procstat{
pidmap: make(map[int32]*process.Process),
}
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}
var sampleConfig = `
# Must specify one of: pid_file, exe, or pattern
# PID file to monitor process
pid_file = "/var/run/nginx.pid"
# executable name (ie, pgrep <exe>)
# exe = "nginx"
# pattern as argument for pgrep (ie, pgrep -f <pattern>)
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# pattern = "nginx"
# Field name prefix
prefix = ""
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`
func (_ *Procstat) SampleConfig() string {
return sampleConfig
}
func (_ *Procstat) Description() string {
return "Monitor process cpu and memory usage"
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}
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func (p *Procstat) Gather(acc inputs.Accumulator) error {
err := p.createProcesses()
if err != nil {
log.Printf("Error: procstat getting process, exe: [%s] pidfile: [%s] pattern: [%s] %s",
p.Exe, p.PidFile, p.Pattern, err.Error())
} else {
for _, proc := range p.pidmap {
p := NewSpecProcessor(p.Prefix, acc, proc)
p.pushMetrics()
}
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}
return nil
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}
func (p *Procstat) createProcesses() error {
var errstring string
var outerr error
pids, err := p.getAllPids()
if err != nil {
errstring += err.Error() + " "
}
for _, pid := range pids {
_, ok := p.pidmap[pid]
if !ok {
proc, err := process.NewProcess(pid)
if err == nil {
p.pidmap[pid] = proc
} else {
errstring += err.Error() + " "
}
}
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}
if errstring != "" {
outerr = fmt.Errorf("%s", errstring)
}
return outerr
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}
func (p *Procstat) getAllPids() ([]int32, error) {
var pids []int32
var err error
if p.PidFile != "" {
pids, err = pidsFromFile(p.PidFile)
} else if p.Exe != "" {
pids, err = pidsFromExe(p.Exe)
} else if p.Pattern != "" {
pids, err = pidsFromPattern(p.Pattern)
} else {
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err = fmt.Errorf("Either exe, pid_file or pattern has to be specified")
}
return pids, err
}
func pidsFromFile(file string) ([]int32, error) {
var out []int32
var outerr error
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pidString, err := ioutil.ReadFile(file)
if err != nil {
outerr = fmt.Errorf("Failed to read pidfile '%s'. Error: '%s'", file, err)
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} else {
pid, err := strconv.Atoi(strings.TrimSpace(string(pidString)))
if err != nil {
outerr = err
} else {
out = append(out, int32(pid))
}
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}
return out, outerr
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}
func pidsFromExe(exe string) ([]int32, error) {
var out []int32
var outerr error
bin, err := exec.LookPath("pgrep")
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if err != nil {
return out, fmt.Errorf("Couldn't find pgrep binary: %s", err)
}
pgrep, err := exec.Command(bin, exe).Output()
if err != nil {
return out, fmt.Errorf("Failed to execute %s. Error: '%s'", bin, err)
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} else {
pids := strings.Fields(string(pgrep))
for _, pid := range pids {
ipid, err := strconv.Atoi(pid)
if err == nil {
out = append(out, int32(ipid))
} else {
outerr = err
}
}
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}
return out, outerr
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}
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func pidsFromPattern(pattern string) ([]int32, error) {
var out []int32
var outerr error
bin, err := exec.LookPath("pgrep")
if err != nil {
return out, fmt.Errorf("Couldn't find pgrep binary: %s", err)
}
pgrep, err := exec.Command(bin, "-f", pattern).Output()
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if err != nil {
return out, fmt.Errorf("Failed to execute %s. Error: '%s'", bin, err)
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} else {
pids := strings.Fields(string(pgrep))
for _, pid := range pids {
ipid, err := strconv.Atoi(pid)
if err == nil {
out = append(out, int32(ipid))
} else {
outerr = err
}
}
}
return out, outerr
}
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func init() {
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inputs.Add("procstat", func() inputs.Input {
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return NewProcstat()
})
}