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package service
import (
"os/exec"
"strings"
"sync"
"sync/atomic"
"syscall"
"time"
"unsafe"
"github.com/spiral/errors"
"github.com/spiral/roadrunner/v2/plugins/logger"
)
// Process structure contains an information about process, restart information, log, errors, etc
type Process struct {
sync.Mutex
// command to execute
command *exec.Cmd
// rawCmd from the plugin
rawCmd string
Pid int
// root plugin error chan
errCh chan error
// logger
log logger.Logger
ExecTimeout time.Duration
RemainAfterExit bool
RestartSec uint64
// process start time
startTime time.Time
stopped uint64
}
// NewServiceProcess constructs service process structure
func NewServiceProcess(restartAfterExit bool, execTimeout time.Duration, restartDelay uint64, command string, l logger.Logger, errCh chan error) *Process {
return &Process{
rawCmd: command,
RestartSec: restartDelay,
ExecTimeout: execTimeout,
RemainAfterExit: restartAfterExit,
errCh: errCh,
log: l,
}
}
// write message to the log (stderr)
func (p *Process) Write(b []byte) (int, error) {
p.log.Info(toString(b))
return len(b), nil
}
func (p *Process) start() {
p.Lock()
defer p.Unlock()
const op = errors.Op("processor_start")
// crate fat-process here
p.createProcess()
// non blocking process start
err := p.command.Start()
if err != nil {
p.errCh <- errors.E(op, err)
return
}
// start process waiting routine
go p.wait()
// execHandler checks for the execTimeout
go p.execHandler()
// save start time
p.startTime = time.Now()
p.Pid = p.command.Process.Pid
}
// create command for the process
func (p *Process) createProcess() {
// cmdArgs contain command arguments if the command in form of: php <command> or ls <command> -i -b
var cmdArgs []string
cmdArgs = append(cmdArgs, strings.Split(p.rawCmd, " ")...)
if len(cmdArgs) < 2 {
p.command = exec.Command(p.rawCmd) //nolint:gosec
} else {
p.command = exec.Command(cmdArgs[0], cmdArgs[1:]...) //nolint:gosec
}
// redirect stderr into the Write function of the process.go
p.command.Stderr = p
}
// wait process for exit
func (p *Process) wait() {
// Wait error doesn't matter here
err := p.command.Wait()
if err != nil {
p.log.Error("process wait error", "error", err)
}
// wait for restart delay
if p.RemainAfterExit {
// wait for the delay
time.Sleep(time.Second * time.Duration(p.RestartSec))
// and start command again
p.start()
}
}
// stop can be only sent by the Endure when plugin stopped
func (p *Process) stop() {
atomic.StoreUint64(&p.stopped, 1)
}
func (p *Process) execHandler() {
tt := time.NewTicker(time.Second)
for range tt.C {
// lock here, because p.startTime could be changed during the check
p.Lock()
// if the exec timeout is set
if p.ExecTimeout != 0 {
// if stopped -> kill the process (SIGINT-> SIGKILL) and exit
if atomic.CompareAndSwapUint64(&p.stopped, 1, 1) {
err := p.command.Process.Signal(syscall.SIGINT)
if err != nil {
_ = p.command.Process.Signal(syscall.SIGKILL)
}
tt.Stop()
p.Unlock()
return
}
// check the running time for the script
if time.Now().After(p.startTime.Add(p.ExecTimeout)) {
err := p.command.Process.Signal(syscall.SIGINT)
if err != nil {
_ = p.command.Process.Signal(syscall.SIGKILL)
}
p.Unlock()
tt.Stop()
return
}
}
p.Unlock()
}
}
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