forked from Songmu/horenso
/
horenso.go
203 lines (182 loc) · 4.91 KB
/
horenso.go
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package horenso
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"os/exec"
"sync"
"time"
"github.com/Songmu/wrapcommander"
"github.com/jessevdk/go-flags"
"github.com/kballard/go-shellquote"
)
type opts struct {
Reporter []string `short:"r" long:"reporter" required:"true" value-name:"/path/to/reporter.pl" description:"handler for reporting the result of the job"`
Noticer []string `short:"n" long:"noticer" value-name:"/path/to/noticer.rb" description:"handler for noticing the start of the job"`
TimeStamp bool `short:"T" long:"timestamp" description:"add timestamp to merged output"`
Tag string `short:"t" long:"tag" value-name:"job-name" description:"tag of the job"`
}
// Report is represents the result of the command
type Report struct {
Command string `json:"command"`
CommandArgs []string `json:"commandArgs"`
Tag string `json:"tag,omitempty"`
Output string `json:"output"`
Stdout string `json:"stdout"`
Stderr string `json:"stderr"`
ExitCode *int `json:"exitCode,omitempty"`
Result string `json:"result"`
Hostname string `json:"hostname"`
Pid *int `json:"pid,omitempty"`
StartAt *time.Time `json:"startAt,omitempty"`
EndAt *time.Time `json:"endAt,omitempty"`
SystemTime *float64 `json:"systemTime,omitempty"`
UserTime *float64 `json:"userTime,omitempty"`
}
func (o *opts) run(args []string) (Report, error) {
hostname, _ := os.Hostname()
r := Report{
Command: shellquote.Join(args...),
CommandArgs: args,
Tag: o.Tag,
Hostname: hostname,
}
cmd := exec.Command(args[0], args[1:]...)
stdoutPipe, err := cmd.StdoutPipe()
if err != nil {
return o.failReport(r, err.Error()), err
}
stderrPipe, err := cmd.StderrPipe()
if err != nil {
stdoutPipe.Close()
return o.failReport(r, err.Error()), err
}
var bufStdout bytes.Buffer
var bufStderr bytes.Buffer
var bufMerged bytes.Buffer
var wtr io.Writer = &bufMerged
if o.TimeStamp {
wtr = newTimestampWriter(&bufMerged)
}
stdoutPipe2 := io.TeeReader(stdoutPipe, io.MultiWriter(&bufStdout, wtr))
stderrPipe2 := io.TeeReader(stderrPipe, io.MultiWriter(&bufStderr, wtr))
r.StartAt = now()
err = cmd.Start()
if err != nil {
stderrPipe.Close()
stdoutPipe.Close()
return o.failReport(r, err.Error()), err
}
if cmd.Process != nil {
r.Pid = &cmd.Process.Pid
}
done := make(chan struct{})
go func() {
o.runNoticer(r)
done <- struct{}{}
}()
go func() {
defer stdoutPipe.Close()
io.Copy(os.Stdout, stdoutPipe2)
}()
go func() {
defer stderrPipe.Close()
io.Copy(os.Stderr, stderrPipe2)
}()
err = cmd.Wait()
r.EndAt = now()
ex := wrapcommander.ResolveExitCode(err)
r.ExitCode = &ex
r.Result = fmt.Sprintf("command exited with code: %d", *r.ExitCode)
if *r.ExitCode > 128 {
r.Result = fmt.Sprintf("command died with signal: %d", *r.ExitCode&127)
}
r.Stdout = bufStdout.String()
r.Stderr = bufStderr.String()
r.Output = bufMerged.String()
if p := cmd.ProcessState; p != nil {
durPtr := func(t time.Duration) *float64 {
f := float64(t) / float64(time.Second)
return &f
}
r.UserTime = durPtr(p.UserTime())
r.SystemTime = durPtr(p.SystemTime())
}
o.runReporter(r)
<-done
return r, nil
}
func now() *time.Time {
now := time.Now()
return &now
}
func parseArgs(args []string) (*flags.Parser, *opts, []string, error) {
o := &opts{}
p := flags.NewParser(o, flags.Default)
p.Usage = "--reporter /path/to/reporter.pl -- /path/to/job [...]"
rest, err := p.ParseArgs(args)
return p, o, rest, err
}
// Run the horenso
func Run(args []string) int {
p, o, cmdArgs, err := parseArgs(args)
if err != nil || len(cmdArgs) < 1 {
if ferr, ok := err.(*flags.Error); !ok || ferr.Type != flags.ErrHelp {
p.WriteHelp(os.Stderr)
}
return 2
}
r, err := o.run(cmdArgs)
if err != nil {
return wrapcommander.ResolveExitCode(err)
}
return *r.ExitCode
}
func (o *opts) failReport(r Report, errStr string) Report {
fail := -1
r.ExitCode = &fail
r.Result = fmt.Sprintf("failed to execute command: %s", errStr)
done := make(chan struct{})
go func() {
o.runNoticer(r)
done <- struct{}{}
}()
o.runReporter(r)
<-done
return r
}
func runHandler(cmdStr string, json []byte) ([]byte, error) {
args, err := shellquote.Split(cmdStr)
if err != nil || len(args) < 1 {
return nil, fmt.Errorf("invalid handler: %q", cmdStr)
}
cmd := exec.Command(args[0], args[1:]...)
stdinPipe, _ := cmd.StdinPipe()
stdinPipe.Write(json)
stdinPipe.Close()
return cmd.CombinedOutput()
}
func runHandlers(handlers []string, json []byte) {
wg := &sync.WaitGroup{}
for _, handler := range handlers {
wg.Add(1)
go func(h string) {
runHandler(h, json)
wg.Done()
}(handler)
}
wg.Wait()
}
func (o *opts) runNoticer(r Report) {
if len(o.Noticer) < 1 {
return
}
json, _ := json.Marshal(r)
runHandlers(o.Noticer, json)
}
func (o *opts) runReporter(r Report) {
json, _ := json.Marshal(r)
runHandlers(o.Reporter, json)
}