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task.go
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task.go
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package main
import (
"context"
"crypto/sha1"
"encoding/hex"
"fmt"
"io"
"log"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/fatih/color"
"github.com/pkg/errors"
)
// A Task is an independant unit of work
type Task struct {
// Name is used to identify the task in the case of errors, as well as the prefix for logs.
Name string
// Dir is the working directory. If empty, the current working directory is used.
Dir string
// Quiet will omit starting messages.
Quiet bool
// Before is a task that must complete before the current one starts.
Before *Task
// After is a task that will run after the current one exits for any reason.
After *Task
// Command contains the binary to run, followed by any/all arguments.
Command []string
// Env parameters will be set in addition to any current ones.
Env []string
// Restart will cause the process to restart automatically if it terminates.
Restart bool
// IgnoreErrors will allow all processes to continue, even if a non-zero exit status is returned.
IgnoreErrors bool
// Watch will cause the process to restart if/when the binary changes.
Watch bool
// ExitAfter, if true, will cause all tasks to be terminated when this one finishes.
ExitAfter bool
}
func hashFile(path string) string {
fd, err := os.Open(path)
if err != nil {
return ""
}
defer fd.Close()
h := sha1.New()
io.Copy(h, fd)
return hex.EncodeToString(h.Sum(nil))
}
func (t *Task) run(ctx context.Context, pad int, attr color.Attribute, w io.Writer) error {
c := color.New(attr)
cb := color.New(attr, color.Bold)
pref := fmt.Sprintf("\t%-"+strconv.Itoa(pad)+"s", t.Name)
stdout := newWritePrefixer(attr, pref+" (out): ", w)
stderr := newWritePrefixer(attr, pref+" (err): ", w)
if logDir != "" {
os.MkdirAll(logDir, 0755)
outFile, err := os.Create(filepath.Join(logDir, fmt.Sprintf("%s.out.log", t.Name)))
if err != nil {
return errors.Wrap(err, "create stdout log")
}
defer outFile.Close()
errFile, err := os.Create(filepath.Join(logDir, fmt.Sprintf("%s.err.log", t.Name)))
if err != nil {
return errors.Wrap(err, "create stderr log")
}
defer errFile.Close()
stdout = io.MultiWriter(stdout, outFile)
stderr = io.MultiWriter(stderr, errFile)
}
defer log.Println(color.New(color.BgRed).Sprint(" QUIT "), cb.Sprint(t.Name))
rawBin := t.Command[0]
if t.Dir != "" && strings.HasPrefix(rawBin, ".") {
rawBin = filepath.Join(t.Dir, rawBin)
}
bin, err := exec.LookPath(rawBin)
if err != nil {
return errors.Wrapf(err, "lookup %s", rawBin)
}
bin, err = filepath.Abs(bin)
if err != nil {
return errors.Wrapf(err, "lookup %s", rawBin)
}
if t.Before != nil {
err = t.Before.run(ctx, pad, attr|color.Faint, w)
if err != nil {
return errors.Wrap(err, "before")
}
}
if t.After != nil {
defer t.After.run(context.Background(), pad, attr|color.Faint, w)
}
tick := time.NewTicker(time.Second)
defer tick.Stop()
for {
procCtx, cancel := context.WithCancel(ctx)
hash := hashFile(bin)
if t.Watch {
go func() {
defer cancel()
t := time.NewTicker(time.Second)
for {
select {
case <-procCtx.Done():
return
case <-t.C:
}
newHash := hashFile(bin)
if newHash == hash {
continue
}
return
}
}()
}
cmd := exec.CommandContext(procCtx, bin, t.Command[1:]...)
cmd.Dir = t.Dir
cmd.Stdout = stdout
cmd.Stderr = stderr
cmd.Env = append(os.Environ(), t.Env...)
if !t.Quiet {
log.Println(c.Sprint("Starting"), cb.Sprintf("%s[%s]", t.Name, hash), c.Sprint(bin+" "+strings.Join(t.Command[1:], " ")))
}
err := cmd.Run()
cancel()
if err != nil && !t.IgnoreErrors {
return errors.Wrapf(err, "run %s", t.Name)
}
if !t.Restart {
break
}
select {
case <-tick.C:
case <-ctx.Done():
return ctx.Err()
}
}
return nil
}