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program.go
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program.go
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package collectors
import (
"bufio"
"encoding/json"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"runtime"
"strconv"
"strings"
"time"
"bosun.org/metadata"
"bosun.org/opentsdb"
"bosun.org/slog"
"bosun.org/util"
)
type ProgramCollector struct {
Path string
Interval time.Duration
}
func InitPrograms(cpath string) {
cdir, err := os.Open(cpath)
if err != nil {
slog.Infoln(err)
return
}
idirs, err := cdir.Readdir(0)
if err != nil {
slog.Infoln(err)
return
}
for _, idir := range idirs {
i, err := strconv.Atoi(idir.Name())
if err != nil || i < 0 {
slog.Infoln("invalid collector folder name:", idir.Name())
continue
}
interval := time.Second * time.Duration(i)
dir, err := os.Open(filepath.Join(cdir.Name(), idir.Name()))
if err != nil {
slog.Infoln(err)
continue
}
files, err := dir.Readdir(0)
if err != nil {
slog.Infoln(err)
continue
}
for _, file := range files {
if !isExecutable(file) {
continue
}
collectors = append(collectors, &ProgramCollector{
Path: filepath.Join(dir.Name(), file.Name()),
Interval: interval,
})
}
}
}
func isExecutable(f os.FileInfo) bool {
switch runtime.GOOS {
case "windows":
exts := strings.Split(os.Getenv("PATHEXT"), ";")
fileExt := filepath.Ext(strings.ToUpper(f.Name()))
for _, ext := range exts {
if filepath.Ext(strings.ToUpper(ext)) == fileExt {
return true
}
}
return false
default:
return f.Mode()&0111 != 0
}
}
func (c *ProgramCollector) Run(dpchan chan<- *opentsdb.DataPoint, quit <-chan struct{}) {
if c.Interval == 0 {
for {
next := time.After(DefaultFreq)
if err := c.runProgram(dpchan); err != nil {
slog.Infoln(err)
}
<-next
slog.Infoln("restarting", c.Path)
}
} else {
for {
next := time.After(c.Interval)
c.runProgram(dpchan)
select {
case <-next:
case <-quit:
return
}
}
}
}
func (c *ProgramCollector) Init() {
}
var setupExternalCommand = func(cmd *exec.Cmd) {}
func (c *ProgramCollector) runProgram(dpchan chan<- *opentsdb.DataPoint) (progError error) {
cmd := exec.Command(c.Path)
setupExternalCommand(cmd)
pr, pw := io.Pipe()
s := bufio.NewScanner(pr)
cmd.Stdout = pw
er, ew := io.Pipe()
cmd.Stderr = ew
if err := cmd.Start(); err != nil {
return err
}
go func() {
progError = cmd.Wait()
pw.Close()
ew.Close()
}()
go func() {
es := bufio.NewScanner(er)
for es.Scan() {
line := strings.TrimSpace(es.Text())
slog.Error(line)
}
}()
for s.Scan() {
var errs []error
t := strings.TrimSpace(s.Text())
if len(t) == 0 {
continue
}
if dp, err := parseTcollectorValue(t); err == nil {
dpchan <- dp
continue
} else {
errs = append(errs, fmt.Errorf("tcollector: %v", err))
}
var dp opentsdb.DataPoint
if err := json.Unmarshal([]byte(t), &dp); err != nil {
errs = append(errs, fmt.Errorf("opentsdb.DataPoint: %v", err))
} else if dp.Valid() {
if dp.Tags == nil {
dp.Tags = opentsdb.TagSet{}
}
setExternalTags(dp.Tags)
dpchan <- &dp
continue
} else {
errs = append(errs, fmt.Errorf("opentsdb.DataPoint: invalid data"))
}
var m metadata.Metasend
if err := json.Unmarshal([]byte(t), &m); err != nil {
errs = append(errs, fmt.Errorf("metadata.Metasend: %v", err))
} else {
if m.Tags == nil {
m.Tags = opentsdb.TagSet{}
}
setExternalTags(m.Tags)
if m.Value == "" || m.Name == "" || (m.Metric == "" && len(m.Tags) == 0) {
errs = append(errs, fmt.Errorf("metadata.Metasend: invalid data"))
} else {
metadata.AddMeta(m.Metric, m.Tags, m.Name, m.Value, false)
continue
}
}
slog.Errorf("%s: unparseable line: %s", c.Path, t)
for _, e := range errs {
slog.Error(e)
}
}
if err := s.Err(); err != nil {
return err
}
return
}
// setExternalTags adds and deletes system-level tags to tags. The host
// tag is set to the hostname if unspecified, or removed if present and
// empty. Command line tags (in AddTags) are then added.
func setExternalTags(tags opentsdb.TagSet) {
if v, ok := tags["host"]; ok && v == "" {
delete(tags, "host")
} else if v == "" {
tags["host"] = util.Hostname
}
for k, v := range AddTags {
if _, ok := tags[k]; !ok {
tags[k] = v
}
}
}
// parseTcollectorValue parses a tcollector-style line into a data point.
func parseTcollectorValue(line string) (*opentsdb.DataPoint, error) {
sp := strings.Fields(line)
if len(sp) < 3 {
return nil, fmt.Errorf("bad line: %s", line)
}
ts, err := strconv.ParseInt(sp[1], 10, 64)
if err != nil {
return nil, fmt.Errorf("bad timestamp: %s", sp[1])
}
val, err := strconv.ParseFloat(sp[2], 64)
if err != nil {
return nil, fmt.Errorf("bad value: %s", sp[2])
}
if !opentsdb.ValidTag(sp[0]) {
return nil, fmt.Errorf("bad metric: %s", sp[0])
}
dp := opentsdb.DataPoint{
Metric: sp[0],
Timestamp: ts,
Value: val,
}
tags := opentsdb.TagSet{}
for _, tag := range sp[3:] {
ts, err := opentsdb.ParseTags(tag)
if err != nil {
return nil, fmt.Errorf("bad tag, metric %s: %v: %v", sp[0], tag, err)
}
tags.Merge(ts)
}
setExternalTags(tags)
dp.Tags = tags
return &dp, nil
}
func (c *ProgramCollector) Name() string {
return c.Path
}