Monitor process by pidfile or exe name

This commit is contained in:
Ranjib Dey 2015-10-03 22:09:18 -07:00 committed by Cameron Sparr
parent 47258a7093
commit fdf00c1be6
4 changed files with 240 additions and 0 deletions

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@ -16,6 +16,7 @@ import (
_ "github.com/influxdb/telegraf/plugins/nginx" _ "github.com/influxdb/telegraf/plugins/nginx"
_ "github.com/influxdb/telegraf/plugins/ping" _ "github.com/influxdb/telegraf/plugins/ping"
_ "github.com/influxdb/telegraf/plugins/postgresql" _ "github.com/influxdb/telegraf/plugins/postgresql"
_ "github.com/influxdb/telegraf/plugins/procstat"
_ "github.com/influxdb/telegraf/plugins/prometheus" _ "github.com/influxdb/telegraf/plugins/prometheus"
_ "github.com/influxdb/telegraf/plugins/rabbitmq" _ "github.com/influxdb/telegraf/plugins/rabbitmq"
_ "github.com/influxdb/telegraf/plugins/redis" _ "github.com/influxdb/telegraf/plugins/redis"

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@ -0,0 +1,104 @@
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 `toml:pid_file`
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()
})
}

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@ -0,0 +1,28 @@
package procstat
import (
"github.com/influxdb/telegraf/testutil"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"io/ioutil"
"os"
"strconv"
"testing"
)
func TestGather(t *testing.T) {
var acc testutil.Accumulator
pid := os.Getpid()
file, err := ioutil.TempFile(os.TempDir(), "telegraf")
require.NoError(t, err)
file.Write([]byte(strconv.Itoa(pid)))
file.Close()
defer os.Remove(file.Name())
specifications := []*Specification{&Specification{PidFile: file.Name(), Prefix: "foo"}}
p := Procstat{
Specifications: specifications,
}
p.Gather(&acc)
assert.True(t, acc.HasFloatValue("foo_cpu_user"))
assert.True(t, acc.HasUIntValue("foo_memory_vms"))
}

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@ -0,0 +1,107 @@
package procstat
import (
"fmt"
"github.com/influxdb/telegraf/plugins"
"github.com/shirou/gopsutil/process"
)
type SpecProcessor struct {
Prefix string
tags map[string]string
acc plugins.Accumulator
proc *process.Process
}
func (p *SpecProcessor) add(metric string, value interface{}) {
p.acc.Add(p.Prefix+"_"+metric, value, p.tags)
}
func NewSpecProcessor(prefix string, acc plugins.Accumulator, p *process.Process) *SpecProcessor {
return &SpecProcessor{
Prefix: prefix,
tags: map[string]string{},
acc: acc,
proc: p,
}
}
func (p *SpecProcessor) pushMetrics() error {
if err := p.pushFDStats(); err != nil {
return err
}
if err := p.pushCtxStats(); err != nil {
return err
}
if err := p.pushIOStats(); err != nil {
return err
}
if err := p.pushCPUStats(); err != nil {
return err
}
if err := p.pushMemoryStats(); err != nil {
return err
}
return nil
}
func (p *SpecProcessor) pushFDStats() error {
fds, err := p.proc.NumFDs()
if err != nil {
return fmt.Errorf("NumFD error: %s\n", err)
}
p.add("num_fds", fds)
return nil
}
func (p *SpecProcessor) pushCtxStats() error {
ctx, err := p.proc.NumCtxSwitches()
if err != nil {
return fmt.Errorf("ContextSwitch error: %s\n", err)
}
p.add("voluntary_context_switches", ctx.Voluntary)
p.add("involuntary_context_switches", ctx.Involuntary)
return nil
}
func (p *SpecProcessor) pushIOStats() error {
io, err := p.proc.IOCounters()
if err != nil {
return fmt.Errorf("IOCounters error: %s\n", err)
}
p.add("read_count", io.ReadCount)
p.add("write_count", io.WriteCount)
p.add("read_bytes", io.ReadBytes)
p.add("write_bytes", io.WriteCount)
return nil
}
func (p *SpecProcessor) pushCPUStats() error {
cpu, err := p.proc.CPUTimes()
if err != nil {
return err
}
p.add("cpu_user", cpu.User)
p.add("cpu_system", cpu.System)
p.add("cpu_idle", cpu.Idle)
p.add("cpu_nice", cpu.Nice)
p.add("cpu_iowait", cpu.Iowait)
p.add("cpu_irq", cpu.Irq)
p.add("cpu_soft_irq", cpu.Softirq)
p.add("cpu_soft_steal", cpu.Steal)
p.add("cpu_soft_stolen", cpu.Stolen)
p.add("cpu_soft_guest", cpu.Guest)
p.add("cpu_soft_guest_nice", cpu.GuestNice)
return nil
}
func (p *SpecProcessor) pushMemoryStats() error {
mem, err := p.proc.MemoryInfo()
if err != nil {
return err
}
p.add("memory_rss", mem.RSS)
p.add("memory_vms", mem.VMS)
p.add("memory_swap", mem.Swap)
return nil
}