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"
"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
type Procstat struct {
PidFile string `toml:"pid_file"`
Exe string
Pattern string
Prefix string
ProcessName string
User string
PidTag bool
// pidmap maps a pid to a process object, so we don't recreate every gather
pidmap map[int32]*process.Process
// tagmap maps a pid to a map of tags for that pid
tagmap map[int32]map[string]string
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}
func NewProcstat() *Procstat {
return &Procstat{
pidmap: make(map[int32]*process.Process),
tagmap: make(map[int32]map[string]string),
}
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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"
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## user as argument for pgrep (ie, pgrep -u <user>)
# user = "nginx"
## override for process_name
## This is optional; default is sourced from /proc/<pid>/status
# process_name = "bar"
## Field name prefix
prefix = ""
## comment this out if you want raw cpu_time stats
fielddrop = ["cpu_time_*"]
## This is optional; moves pid into a tag instead of a field
pid_tag = false
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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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}
func (p *Procstat) Gather(acc telegraf.Accumulator) error {
err := p.createProcesses()
if err != nil {
log.Printf("E! Error: procstat getting process, exe: [%s] pidfile: [%s] pattern: [%s] user: [%s] %s",
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p.Exe, p.PidFile, p.Pattern, p.User, err.Error())
} else {
for pid, proc := range p.pidmap {
if p.PidTag {
p.tagmap[pid]["pid"] = fmt.Sprint(pid)
}
p := NewSpecProcessor(p.ProcessName, p.Prefix, pid, acc, proc, p.tagmap[pid])
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 = p.pidsFromFile()
} else if p.Exe != "" {
pids, err = p.pidsFromExe()
} else if p.Pattern != "" {
pids, err = p.pidsFromPattern()
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} else if p.User != "" {
pids, err = p.pidsFromUser()
} else {
err = fmt.Errorf("Either exe, pid_file, user, or pattern has to be specified")
}
return pids, err
}
func (p *Procstat) pidsFromFile() ([]int32, error) {
var out []int32
var outerr error
pidString, err := ioutil.ReadFile(p.PidFile)
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if err != nil {
outerr = fmt.Errorf("Failed to read pidfile '%s'. Error: '%s'",
p.PidFile, 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))
p.tagmap[int32(pid)] = map[string]string{
"pidfile": p.PidFile,
}
}
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}
return out, outerr
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}
func (p *Procstat) pidsFromExe() ([]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, p.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))
p.tagmap[int32(ipid)] = map[string]string{
"exe": p.Exe,
}
} else {
outerr = err
}
}
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}
return out, outerr
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}
func (p *Procstat) pidsFromPattern() ([]int32, error) {
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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", p.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))
p.tagmap[int32(ipid)] = map[string]string{
"pattern": p.Pattern,
}
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} else {
outerr = err
}
}
}
return out, outerr
}
func (p *Procstat) pidsFromUser() ([]int32, error) {
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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, "-u", p.User).Output()
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if err != nil {
return out, fmt.Errorf("Failed to execute %s. Error: '%s'", bin, err)
} else {
pids := strings.Fields(string(pgrep))
for _, pid := range pids {
ipid, err := strconv.Atoi(pid)
if err == nil {
out = append(out, int32(ipid))
p.tagmap[int32(ipid)] = map[string]string{
"user": p.User,
}
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} else {
outerr = err
}
}
}
return out, outerr
}
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func init() {
inputs.Add("procstat", func() telegraf.Input {
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return NewProcstat()
})
}