121 lines
2.3 KiB
Go
121 lines
2.3 KiB
Go
package warden
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import (
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"time"
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"github.com/samber/lo"
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)
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var InstancePool []*AppInstance
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func GetFromPool(id string) *AppInstance {
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val, ok := lo.Find(InstancePool, func(item *AppInstance) bool {
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return item.Manifest.ID == id
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})
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return lo.Ternary(ok, val, nil)
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}
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func StartPool() []error {
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var errors []error
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for _, instance := range InstancePool {
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if err := instance.Wake(); err != nil {
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errors = append(errors, err)
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}
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}
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return errors
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}
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type AppStatus = int8
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const (
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AppCreated = AppStatus(iota)
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AppStarting
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AppStarted
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AppExited
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AppFailure
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)
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type AppInstance struct {
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Manifest Application `json:"manifest"`
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Cmd *exec.Cmd `json:"-"`
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Logger strings.Builder `json:"-"`
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Status AppStatus `json:"status"`
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}
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func (v *AppInstance) Wake() error {
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if v.Cmd != nil {
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return nil
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}
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if v.Cmd == nil {
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return v.Start()
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}
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if v.Cmd.Process == nil || v.Cmd.ProcessState == nil {
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return v.Start()
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}
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if v.Cmd.ProcessState.Exited() {
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return v.Start()
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} else if v.Cmd.ProcessState.Exited() {
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return fmt.Errorf("process already dead")
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}
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if v.Cmd.ProcessState.Exited() {
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return fmt.Errorf("cannot start process")
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} else {
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return nil
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}
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}
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func (v *AppInstance) Start() error {
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manifest := v.Manifest
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if len(manifest.Command) <= 0 {
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return fmt.Errorf("you need set the command for %s to enable process manager", manifest.ID)
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}
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v.Cmd = exec.Command(manifest.Command[0], manifest.Command[1:]...)
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v.Cmd.Dir = filepath.Join(manifest.Workdir)
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v.Cmd.Env = append(v.Cmd.Env, manifest.Environment...)
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v.Cmd.Stdout = &v.Logger
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v.Cmd.Stderr = &v.Logger
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// Monitor
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go func() {
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for {
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if v.Cmd.Process == nil || v.Cmd.ProcessState == nil {
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v.Status = AppStarting
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} else if !v.Cmd.ProcessState.Exited() {
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v.Status = AppStarted
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} else {
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v.Status = lo.Ternary(v.Cmd.ProcessState.Success(), AppExited, AppFailure)
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return
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}
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time.Sleep(100 * time.Millisecond)
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}
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}()
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return v.Cmd.Start()
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}
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func (v *AppInstance) Stop() error {
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if v.Cmd != nil && v.Cmd.Process != nil {
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if err := v.Cmd.Process.Signal(os.Interrupt); err != nil {
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v.Cmd.Process.Kill()
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return err
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} else {
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v.Cmd = nil
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}
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}
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return nil
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}
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func (v *AppInstance) Logs() string {
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return v.Logger.String()
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}
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