155 lines
3.0 KiB
Go
155 lines
3.0 KiB
Go
package procstat
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import (
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"fmt"
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"io/ioutil"
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"log"
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"os/exec"
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"strconv"
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"strings"
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"sync"
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"github.com/shirou/gopsutil/process"
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"github.com/influxdb/telegraf/plugins"
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)
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type Specification struct {
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PidFile string `toml:"pid_file"`
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Exe string
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Prefix string
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}
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type Procstat struct {
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Specifications []*Specification
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}
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func NewProcstat() *Procstat {
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return &Procstat{}
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}
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var sampleConfig = `
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[[procstat.specifications]]
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prefix = "" # optional string to prefix measurements
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# Use one of pid_file or exe to find process
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pid_file = "/var/run/nginx.pid"
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# executable name (used by pgrep)
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# exe = "nginx"
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`
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func (_ *Procstat) SampleConfig() string {
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return sampleConfig
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}
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func (_ *Procstat) Description() string {
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return "Monitor process cpu and memory usage"
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}
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func (p *Procstat) Gather(acc plugins.Accumulator) error {
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var wg sync.WaitGroup
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for _, specification := range p.Specifications {
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wg.Add(1)
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go func(spec *Specification, acc plugins.Accumulator) {
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defer wg.Done()
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procs, err := spec.createProcesses()
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if err != nil {
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log.Printf("Error: procstat getting process, exe: [%s] pidfile: [%s] %s",
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spec.Exe, spec.PidFile, err.Error())
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} else {
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for _, proc := range procs {
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p := NewSpecProcessor(spec.Prefix, acc, proc)
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p.pushMetrics()
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}
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}
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}(specification, acc)
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}
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wg.Wait()
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return nil
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}
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func (spec *Specification) createProcesses() ([]*process.Process, error) {
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var out []*process.Process
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var errstring string
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var outerr error
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pids, err := spec.getAllPids()
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if err != nil {
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errstring += err.Error() + " "
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}
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for _, pid := range pids {
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p, err := process.NewProcess(int32(pid))
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if err == nil {
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out = append(out, p)
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} else {
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errstring += err.Error() + " "
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}
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}
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if errstring != "" {
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outerr = fmt.Errorf("%s", errstring)
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}
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return out, outerr
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}
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func (spec *Specification) getAllPids() ([]int32, error) {
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var pids []int32
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var err error
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if spec.PidFile != "" {
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pids, err = pidsFromFile(spec.PidFile)
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} else if spec.Exe != "" {
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pids, err = pidsFromExe(spec.Exe)
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} else {
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err = fmt.Errorf("Either exe or pid_file has to be specified")
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}
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return pids, err
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}
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func pidsFromFile(file string) ([]int32, error) {
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var out []int32
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var outerr error
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pidString, err := ioutil.ReadFile(file)
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if err != nil {
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outerr = fmt.Errorf("Failed to read pidfile '%s'. Error: '%s'", file, err)
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} else {
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pid, err := strconv.Atoi(strings.TrimSpace(string(pidString)))
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if err != nil {
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outerr = err
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} else {
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out = append(out, int32(pid))
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}
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}
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return out, outerr
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}
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func pidsFromExe(exe string) ([]int32, error) {
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var out []int32
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var outerr error
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pgrep, err := exec.Command("pgrep", exe).Output()
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if err != nil {
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return out, fmt.Errorf("Failed to execute pgrep. Error: '%s'", err)
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} else {
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pids := strings.Fields(string(pgrep))
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for _, pid := range pids {
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ipid, err := strconv.Atoi(pid)
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if err == nil {
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out = append(out, int32(ipid))
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} else {
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outerr = err
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}
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}
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}
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return out, outerr
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}
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func init() {
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plugins.Add("procstat", func() plugins.Plugin {
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return NewProcstat()
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})
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}
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