telegraf/plugins/procstat/procstat.go

105 lines
2.2 KiB
Go

package procstat
import (
"fmt"
"github.com/influxdb/telegraf/plugins"
"github.com/shirou/gopsutil/process"
"io/ioutil"
"os/exec"
"strconv"
"strings"
"sync"
)
type Specification struct {
PidFile string
Exe string
Prefix string
}
type Procstat struct {
Specifications []*Specification
}
func NewProcstat() *Procstat {
return &Procstat{}
}
var sampleConfig = `
[[process.specifications]]
# pid file
pid_file = "/path/to/foo.pid"
# executable name (used by pgrep)
exe = "/path/to/foo"
name = "foo" # required
`
func (_ *Procstat) SampleConfig() string {
return sampleConfig
}
func (_ *Procstat) Description() string {
return "Monitor process cpu and memory usage"
}
func (p *Procstat) Gather(acc plugins.Accumulator) error {
var wg sync.WaitGroup
var outerr error
for _, specification := range p.Specifications {
wg.Add(1)
go func(spec *Specification, acc plugins.Accumulator) {
defer wg.Done()
proc, err := spec.createProcess()
if err != nil {
outerr = err
} else {
outerr = NewSpecProcessor(spec.Prefix, acc, proc).pushMetrics()
}
}(specification, acc)
}
wg.Wait()
return outerr
}
func (spec *Specification) createProcess() (*process.Process, error) {
if spec.PidFile != "" {
pid, err := pidFromFile(spec.PidFile)
if err != nil {
return nil, err
}
return process.NewProcess(int32(pid))
} else if spec.Exe != "" {
pid, err := pidFromExe(spec.Exe)
if err != nil {
return nil, err
}
return process.NewProcess(int32(pid))
} else {
return nil, fmt.Errorf("Either exe or pid_file has to be specified")
}
}
func pidFromFile(file string) (int, error) {
pidString, err := ioutil.ReadFile(file)
if err != nil {
return -1, fmt.Errorf("Failed to read pidfile '%s'. Error: '%s'", file, err)
} else {
return strconv.Atoi(strings.TrimSpace(string(pidString)))
}
}
func pidFromExe(exe string) (int, error) {
pidString, err := exec.Command("pgrep", exe).Output()
if err != nil {
return -1, fmt.Errorf("Failed to execute pgrep. Error: '%s'", err)
} else {
return strconv.Atoi(strings.TrimSpace(string(pidString)))
}
}
func init() {
plugins.Add("process", func() plugins.Plugin {
return NewProcstat()
})
}