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parallel.go
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parallel.go
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package main
/*
like xargs, but with nicer logging
*/
import (
"fmt"
"io"
"log"
"os"
"os/exec"
"bufio"
"strconv"
"strings"
)
func Contents(path string) ([]string, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
var lines []string
scanner := bufio.NewScanner(file)
for scanner.Scan() {
lines = append(lines, scanner.Text())
}
return lines, scanner.Err()
}
type ExitStatus struct {
Id string
Return int
}
type Pipes struct {
cmd *exec.Cmd
stdout io.ReadCloser
stderr io.ReadCloser
stdin io.WriteCloser
bufOut *bufio.Reader
bufErr *bufio.Reader
bufIn *bufio.Writer
}
func Run(program string, args ...string) error {
cmd := exec.Command(program, args...)
cmd.Stdin = os.Stdin;
cmd.Stdout = os.Stdout;
cmd.Stderr = os.Stderr;
err := cmd.Run()
if err != nil {
log.Printf("%v\n", err)
}
return err
}
func (run *Pipes) Execute(program string, args ...string) error {
var err error
(*run).cmd = exec.Command(program, args...)
run.stdout, err = (*run).cmd.StdoutPipe()
if err != nil {panic(err)}
(*run).stderr, err = (*run).cmd.StderrPipe()
if err != nil {panic(err)}
(*run).stdin, err = (*run).cmd.StdinPipe()
if err != nil {panic(err)}
(*run).bufOut = bufio.NewReader((*run).stdout)
(*run).bufErr = bufio.NewReader((*run).stderr)
(*run).bufIn = bufio.NewWriter((*run).stdin)
err = (*run).cmd.Start()
if err != nil {
log.Println(fmt.Sprintf("#PROBLEM.. %s", program))
}
return err
}
func (run *Pipes) ReadOut() (string, error) {
line, err := (*run).bufOut.ReadString('\n')
return line, err
}
func (run *Pipes) Wait() error {
return (*run).cmd.Wait()
}
func (run *Pipes) ReadErr() (string, error) {
line, err := (*run).bufErr.ReadString('\n')
return line, err
}
func (run *Pipes) Process(status_channel chan ExitStatus, id string, program string, args ...string) {
var start_status = run.Execute(program, args...)
var err_status = ExitStatus{id, 1}
if start_status != nil {
fmt.Println(fmt.Sprintf("#ERR.. failed@start:%s", id))
fmt.Println(fmt.Sprintf("#ERR.. return:1 [%s status:%s]", id, start_status.Error()))
status_channel <- err_status
}
fmt.Println(fmt.Sprintf("#MSG.. started:ok [%s]", id))
var line_o, line_e string
var err_o, err_e error
for {
line_o, err_o = run.ReadOut()
line_e, err_e = run.ReadErr()
if err_o != nil && err_e != nil {
break
}
if err_o == nil {
fmt.Print(fmt.Sprintf("#!%s %s" , id, line_o))
}
if err_e == nil {
fmt.Print(fmt.Sprintf("#ERR.. %s" , id, line_e))
}
}
exit_status := run.Wait()
if err_o != io.EOF { fmt.Println(fmt.Sprintf("#MSG.. failed[%s]:%s", id, err_o)) }
if err_e != io.EOF { fmt.Println(fmt.Sprintf("#MSG.. failed[%s]:%s", id, err_e)) }
flush_stdin_buffer := (*run).bufIn.Flush() // wait closes everything else, so this better be ok
if(flush_stdin_buffer != nil){
fmt.Println(fmt.Sprintf("#WARN[%s].. %s", id, flush_stdin_buffer.Error()))
}
if exit_status == nil {
fmt.Println(fmt.Sprintf("#%s return:0 status:ok\n", id))
ok_status := ExitStatus{id, 0}
status_channel <- ok_status
} else {
fmt.Println(fmt.Sprintf("#%s return:1 status:%s\n", id, exit_status.Error()))
status_channel <- err_status
}
}
func main(){
var args = os.Args[1:]
if len(args) < 1 {
log.Fatal("missing tasklist")
}
var tasks, err = Contents(args[0])
if err != nil {
log.Fatal("invalid tasklist")
}
var nParallel = 5
var n = len(tasks);
var statusChannel = make(chan ExitStatus)
var run = make([]Pipes, n, n)
var started = 0
if nParallel >= n {
nParallel = n
}
for started = 0; started < nParallel; started++ {
var task = strings.Split(tasks[started], " "); // replace with shlex, https://github.com/google/shlex
go (&run[started]).Process(statusChannel, strconv.Itoa(started), task[0], task[1:]...)
}
var running = started
for processed := 0; processed < n; {
status_code := <- statusChannel
fmt.Println(fmt.Sprintf("#%s_RETURN:%d\n", status_code.Id, status_code.Return))
running--
processed++
if running < nParallel && started < n {
var task = strings.Split(tasks[started], " "); // replace with shlex, https://github.com/google/shlex
go (&run[started]).Process(statusChannel, strconv.Itoa(started), task[0], task[1:]...)
started++
running++
}
}
fmt.Println("...ok")
}