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Use pgrep with a pattern #392

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ecarreras wants to merge 2 commits into from
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Use pgrep with a pattern #392

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3f63245
Use pgrep with a pattern
ecarreras Nov 24, 2015
63065c7
Add a comment indicating pattern uses pgrep -f
ecarreras Nov 25, 2015
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30 changes: 27 additions & 3 deletions plugins/procstat/procstat.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ type Specification struct {
PidFile string `toml:"pid_file"`
Exe string
Prefix string
Pattern string
}

type Procstat struct {
Expand All @@ -35,6 +36,7 @@ var sampleConfig = `
pid_file = "/var/run/nginx.pid"
# executable name (used by pgrep)
# exe = "nginx"
# pattern = "nginx"
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@sparrc sparrc Nov 24, 2015

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Please add a comment above this one to let users know it is doing a pgrep -f

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@ecarreras ecarreras Nov 25, 2015

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Done via 63065c7

`

func (_ *Procstat) SampleConfig() string {
Expand All @@ -54,8 +56,8 @@ func (p *Procstat) Gather(acc plugins.Accumulator) error {
defer wg.Done()
procs, err := spec.createProcesses()
if err != nil {
log.Printf("Error: procstat getting process, exe: [%s] pidfile: [%s] %s",
spec.Exe, spec.PidFile, err.Error())
log.Printf("Error: procstat getting process, exe: [%s] pidfile: [%s] pattern: [%s] %s",
spec.Exe, spec.PidFile, spec.Pattern, err.Error())
} else {
for _, proc := range procs {
p := NewSpecProcessor(spec.Prefix, acc, proc)
Expand Down Expand Up @@ -103,8 +105,10 @@ func (spec *Specification) getAllPids() ([]int32, error) {
pids, err = pidsFromFile(spec.PidFile)
} else if spec.Exe != "" {
pids, err = pidsFromExe(spec.Exe)
} else if spec.Pattern != "" {
pids, err = pidsFromPattern(spec.Pattern)
} else {
err = fmt.Errorf("Either exe or pid_file has to be specified")
err = fmt.Errorf("Either exe, pid_file or pattern has to be specified")
}

return pids, err
Expand Down Expand Up @@ -147,6 +151,26 @@ func pidsFromExe(exe string) ([]int32, error) {
return out, outerr
}

func pidsFromPattern(pattern string) ([]int32, error) {
var out []int32
var outerr error
pgrep, err := exec.Command("pgrep", "-f", pattern).Output()
if err != nil {
return out, fmt.Errorf("Failed to execute pgrep. Error: '%s'", err)
} 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
}

func init() {
plugins.Add("procstat", func() plugins.Plugin {
return NewProcstat()
Expand Down