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|
package instance
import (
"context"
"io"
"os"
"os/exec"
"sync"
"time"
"github.com/pingcap/errors"
)
var (
errNotUp = errors.New("not up")
)
// Process represent process to be run by playground
type Process interface {
Start() error
Wait() error
Pid() int
Uptime() string
SetOutputFile(fname string) error
Cmd() *exec.Cmd
}
// process implements Process
type process struct {
cmd *exec.Cmd
startTime time.Time
waitOnce sync.Once
waitErr error
}
// Start the process
func (p *process) Start() error {
if p == nil {
return errNotUp
}
// fmt.Printf("Starting `%s`: %s", filepath.Base(p.cmd.Path), strings.Join(p.cmd.Args, " "))
p.startTime = time.Now()
return p.cmd.Start()
}
// Wait implements Instance interface.
func (p *process) Wait() error {
if p == nil {
return errNotUp
}
p.waitOnce.Do(func() {
p.waitErr = p.cmd.Wait()
})
return p.waitErr
}
// Pid implements Instance interface.
func (p *process) Pid() int {
if p == nil {
return 0
}
return p.cmd.Process.Pid
}
// Uptime implements Instance interface.
func (p *process) Uptime() string {
if p == nil {
return errNotUp.Error()
}
s := p.cmd.ProcessState
if s != nil {
return s.String()
}
duration := time.Since(p.startTime)
return duration.String()
}
func (p *process) SetOutputFile(fname string) error {
if p == nil {
return errNotUp
}
f, err := os.OpenFile(fname, os.O_RDWR|os.O_CREATE, 0666)
if err != nil {
return errors.AddStack(err)
}
p.setOutput(f)
return nil
}
func (p *process) setOutput(w io.Writer) {
if p == nil {
return
}
p.cmd.Stdout = w
p.cmd.Stderr = w
}
func (p *process) Cmd() *exec.Cmd {
if p == nil {
panic(errNotUp)
}
return p.cmd
}
// PrepareCommand return command for playground
func PrepareCommand(ctx context.Context, binPath string, args, envs []string, workDir string) *exec.Cmd {
c := exec.CommandContext(ctx, binPath, args...)
c.Env = os.Environ()
c.Env = append(c.Env, envs...)
c.Dir = workDir
c.SysProcAttr = SysProcAttr
return c
}
|
