package procstat import ( "fmt" "io/ioutil" "log" "os/exec" "strconv" "strings" "github.com/shirou/gopsutil/process" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/plugins/inputs" ) type Procstat struct { PidFile string `toml:"pid_file"` Exe string Pattern string Prefix string User string // 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 } func NewProcstat() *Procstat { return &Procstat{ pidmap: make(map[int32]*process.Process), tagmap: make(map[int32]map[string]string), } } 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 = "nginx" ## pattern as argument for pgrep (ie, pgrep -f ) # pattern = "nginx" ## user as argument for pgrep (ie, pgrep -u ) # user = "nginx" ## Field name prefix prefix = "" ## comment this out if you want raw cpu_time stats fielddrop = ["cpu_time_*"] ` func (_ *Procstat) SampleConfig() string { return sampleConfig } func (_ *Procstat) Description() string { return "Monitor process cpu and memory usage" } func (p *Procstat) Gather(acc telegraf.Accumulator) error { err := p.createProcesses() if err != nil { log.Printf("Error: procstat getting process, exe: [%s] pidfile: [%s] pattern: [%s] user: [%s] %s", p.Exe, p.PidFile, p.Pattern, p.User, err.Error()) } else { for pid, proc := range p.pidmap { p := NewSpecProcessor(p.Prefix, acc, proc, p.tagmap[pid]) p.pushMetrics() } } return nil } 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() + " " } } } if errstring != "" { outerr = fmt.Errorf("%s", errstring) } return outerr } 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() } 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) if err != nil { outerr = fmt.Errorf("Failed to read pidfile '%s'. Error: '%s'", p.PidFile, err) } 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, "pid": string(pidString), } } } return out, outerr } func (p *Procstat) pidsFromExe() ([]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, p.Exe).Output() 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{ "exe": p.Exe, "pid": pid, } } else { outerr = err } } } return out, outerr } func (p *Procstat) pidsFromPattern() ([]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", p.Pattern).Output() 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{ "pattern": p.Pattern, "pid": pid, } } else { outerr = err } } } return out, outerr } func (p *Procstat) pidsFromUser() ([]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, "-u", p.User).Output() 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, "pid": pid, } } else { outerr = err } } } return out, outerr } func init() { inputs.Add("procstat", func() telegraf.Input { return NewProcstat() }) }