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daemon.go
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daemon.go
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package immortal
import (
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
"sync/atomic"
"syscall"
"time"
)
type Return struct {
err error
msg string
}
type Daemon struct {
cfg *Config
count uint64
done chan error
fifo chan Return
fifo_control *os.File
fifo_ok *os.File
lock uint32
lock_once uint32
quit chan struct{}
sTime time.Time
}
func (d *Daemon) Run(p Process) (*process, error) {
if atomic.SwapUint32(&d.lock, uint32(1)) != 0 {
return nil, fmt.Errorf("lock: %d lock once: %d", d.lock, d.lock_once)
}
// increment count by 1
atomic.AddUint64(&d.count, 1)
time.Sleep(time.Duration(d.cfg.Wait) * time.Second)
process, err := p.Start()
if err != nil {
return nil, err
}
// write parent pid
if d.cfg.Pid.Parent != "" {
if err := d.WritePid(d.cfg.Pid.Parent, os.Getpid()); err != nil {
log.Println(err)
}
}
// write child pid
if d.cfg.Pid.Child != "" {
if err := d.WritePid(d.cfg.Pid.Child, p.Pid()); err != nil {
log.Println(err)
}
}
return process, nil
}
// WritePid write pid to file
func (d *Daemon) WritePid(file string, pid int) error {
if err := ioutil.WriteFile(file, []byte(fmt.Sprintf("%d", pid)), 0644); err != nil {
return err
}
return nil
}
func New(cfg *Config) (*Daemon, error) {
var (
err error
fifo_control *os.File
fifo_ok *os.File
supDir string
)
if cfg.Cwd != "" {
supDir = filepath.Join(cfg.Cwd, "supervise")
} else {
d, err := os.Getwd()
if err != nil {
return nil, err
}
supDir = filepath.Join(d, "supervise")
}
// if ctrl create supervise dir
if cfg.ctrl {
// create fifo
var ctrl = []string{"control", "ok"}
for _, v := range ctrl {
if err := MakeFifo(filepath.Join(supDir, v)); err != nil {
return nil, err
}
}
// lock
if lock, err := os.Create(filepath.Join(supDir, "lock")); err != nil {
return nil, err
} else if err = syscall.Flock(int(lock.Fd()), syscall.LOCK_EX+syscall.LOCK_NB); err != nil {
return nil, err
}
// read fifo
if fifo_control, err = OpenFifo(filepath.Join(supDir, "control")); err != nil {
return nil, err
}
if fifo_ok, err = OpenFifo(filepath.Join(supDir, "ok")); err != nil {
return nil, err
}
}
return &Daemon{
cfg: cfg,
done: make(chan error),
fifo: make(chan Return),
fifo_control: fifo_control,
fifo_ok: fifo_ok,
quit: make(chan struct{}),
sTime: time.Now(),
}, nil
}