105 lines
2.2 KiB
Go
105 lines
2.2 KiB
Go
package procstat
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import (
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"fmt"
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"github.com/influxdb/telegraf/plugins"
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"github.com/shirou/gopsutil/process"
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"io/ioutil"
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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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)
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type Specification struct {
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PidFile string
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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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[[process.specifications]]
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# pid file
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pid_file = "/path/to/foo.pid"
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# executable name (used by pgrep)
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exe = "/path/to/foo"
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name = "foo" # required
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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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var outerr error
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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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proc, err := spec.createProcess()
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if err != nil {
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outerr = err
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} else {
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outerr = NewSpecProcessor(spec.Prefix, acc, proc).pushMetrics()
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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 outerr
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}
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func (spec *Specification) createProcess() (*process.Process, error) {
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if spec.PidFile != "" {
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pid, err := pidFromFile(spec.PidFile)
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if err != nil {
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return nil, err
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}
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return process.NewProcess(int32(pid))
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} else if spec.Exe != "" {
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pid, err := pidFromExe(spec.Exe)
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if err != nil {
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return nil, err
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}
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return process.NewProcess(int32(pid))
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} else {
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return nil, fmt.Errorf("Either exe or pid_file has to be specified")
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}
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}
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func pidFromFile(file string) (int, error) {
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pidString, err := ioutil.ReadFile(file)
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if err != nil {
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return -1, fmt.Errorf("Failed to read pidfile '%s'. Error: '%s'", file, err)
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} else {
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return strconv.Atoi(strings.TrimSpace(string(pidString)))
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}
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}
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func pidFromExe(exe string) (int, error) {
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pidString, err := exec.Command("pgrep", exe).Output()
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if err != nil {
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return -1, fmt.Errorf("Failed to execute pgrep. Error: '%s'", err)
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} else {
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return strconv.Atoi(strings.TrimSpace(string(pidString)))
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}
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}
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func init() {
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plugins.Add("process", func() plugins.Plugin {
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return NewProcstat()
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})
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}
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