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process.go
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process.go
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package immortal
import (
"fmt"
"os"
"os/exec"
"strconv"
"syscall"
"time"
)
// Process interface
type Process interface {
Kill() error
Pid() int
Signal(sig syscall.Signal) error
Start() (*process, error)
GetProcess() *process
}
type process struct {
*Config
Logger
LoggerStderr Logger
cmd *exec.Cmd
errch chan error
quit chan struct{}
sTime, eTime time.Time
}
// SetEnv set environment variables - If the Cmd.Env contains duplicate
// environment keys, only the last value in the slice for each duplicate
// key is used.
func (p *process) SetEnv(env []string) {
if p.Env != nil {
for k, v := range p.Env {
env = append(env, fmt.Sprintf("%s=%s", k, v))
}
p.cmd.Env = env
}
}
// SetsysProcAttr - set process group ID and owner (run on behalf)
func (p *process) SetsysProcAttr() error {
sysProcAttr := &syscall.SysProcAttr{
Setpgid: true, // Set process group ID to Pgid, or, if Pgid == 0, to new pid.
Pgid: 0, // Child's process group ID if Setpgid.
}
// set owner
if p.user != nil {
uid, err := strconv.Atoi(p.user.Uid)
if err != nil {
return err
}
gid, err := strconv.Atoi(p.user.Gid)
if err != nil {
return err
}
sysProcAttr.Credential = &syscall.Credential{
Uid: uint32(uid),
Gid: uint32(gid),
}
}
// set the attributes
p.cmd.SysProcAttr = sysProcAttr
return nil
}
// Start runs the command
func (p *process) Start() (*process, error) {
// command obtained from Config parent
p.cmd = exec.Command(p.command[0], p.command[1:]...)
// change working directory
if p.Cwd != "" {
p.cmd.Dir = p.Cwd
}
// set environment variables
p.SetEnv(os.Environ())
// set sysProcAttr
if err := p.SetsysProcAttr(); err != nil {
return nil, err
}
var (
prStdout, prStderr, pwStdout, pwStderr *os.File
e error
)
// log only if are available loggers
if p.Logger.IsLogging() && p.LoggerStderr.IsLogging() {
// create the pipes for Stdout
prStdout, pwStdout, e = os.Pipe()
if e == nil {
p.cmd.Stdout = pwStdout
go p.Logger.Log(prStdout)
}
prStderr, pwStderr, e = os.Pipe()
if e == nil {
p.cmd.Stderr = pwStderr
go p.LoggerStderr.Log(prStderr)
}
} else if p.Logger.IsLogging() {
// create the pipes for Stdout
prStdout, pwStdout, e = os.Pipe()
if e == nil {
p.cmd.Stdout = pwStdout
p.cmd.Stderr = pwStdout
go p.Logger.Log(prStdout)
}
} else if p.LoggerStderr.IsLogging() {
// create the pipes for Stdout
prStderr, pwStderr, e = os.Pipe()
if e == nil {
p.cmd.Stderr = pwStderr
go p.LoggerStderr.Log(prStderr)
}
}
// Start the process
if err := p.cmd.Start(); err != nil {
return nil, err
}
// set start time
p.sTime = time.Now()
// wait process to finish in a goroutine
go p.Wait(pwStdout, pwStderr)
return p, nil
}
// Wait - wait process to finish
func (p *process) Wait(stdout, stderr *os.File) {
err := p.cmd.Wait()
if stdout != nil {
stdout.Close()
close(p.quit)
}
if stderr != nil {
stderr.Close()
}
p.errch <- err
}
// Kill the entire Process group.
func (p *process) Kill() error {
processGroup := 0 - p.cmd.Process.Pid
return syscall.Kill(processGroup, syscall.SIGKILL)
}
// Pid return Process PID
func (p *process) Pid() int {
if p.cmd == nil || p.cmd.Process == nil {
return 0
}
return p.cmd.Process.Pid
}
// Signal sends a signal to the Process
func (p *process) Signal(sig syscall.Signal) error {
return syscall.Kill(p.cmd.Process.Pid, sig)
}
// GetProccess
func (p *process) GetProcess() *process {
return p
}
// NewProcess return process instance
func NewProcess(cfg *Config) *process {
qch := make(chan struct{})
return &process{
Config: cfg,
Logger: &LogWriter{
logger: NewLogger(cfg, qch),
},
LoggerStderr: &LogWriter{
logger: NewStderrLogger(cfg),
},
errch: make(chan error, 1),
quit: qch,
sTime: time.Now(),
}
}