967497097a
Use the state pattern to handle process transitions from one state to another and what actions can be performed on a process in a specific state. Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
357 lines
7.4 KiB
Go
357 lines
7.4 KiB
Go
// +build !windows
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package shim
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import (
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"context"
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"github.com/containerd/console"
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shimapi "github.com/containerd/containerd/linux/shim/v1"
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"github.com/pkg/errors"
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)
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type initState interface {
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processState
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Pause(context.Context) error
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Resume(context.Context) error
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Update(context.Context, *shimapi.UpdateTaskRequest) error
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Checkpoint(context.Context, *shimapi.CheckpointTaskRequest) error
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}
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type createdState struct {
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p *initProcess
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}
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func (s *createdState) transition(name string) error {
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switch name {
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case "running":
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s.p.initState = &runningState{p: s.p}
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case "stopped":
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s.p.initState = &stoppedState{p: s.p}
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case "deleted":
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s.p.initState = &deletedState{}
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default:
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return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
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}
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return nil
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}
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func (s *createdState) Pause(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot pause task in created state")
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}
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func (s *createdState) Resume(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot resume task in created state")
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}
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func (s *createdState) Update(context context.Context, r *shimapi.UpdateTaskRequest) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.update(context, r)
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}
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func (s *createdState) Checkpoint(context context.Context, r *shimapi.CheckpointTaskRequest) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot checkpoint a task in created state")
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}
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func (s *createdState) Resize(ws console.WinSize) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.resize(ws)
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}
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func (s *createdState) Start(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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if err := s.p.start(ctx); err != nil {
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return err
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}
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return s.transition("running")
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}
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func (s *createdState) Delete(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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if err := s.p.delete(ctx); err != nil {
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return err
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}
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return s.transition("deleted")
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}
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func (s *createdState) Kill(ctx context.Context, sig uint32, all bool) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.kill(ctx, sig, all)
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}
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func (s *createdState) SetExited(status int) {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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s.p.setExited(status)
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if err := s.transition("stopped"); err != nil {
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panic(err)
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}
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}
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type runningState struct {
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p *initProcess
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}
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func (s *runningState) transition(name string) error {
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switch name {
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case "stopped":
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s.p.initState = &stoppedState{p: s.p}
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case "paused":
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s.p.initState = &pausedState{p: s.p}
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default:
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return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
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}
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return nil
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}
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func (s *runningState) Pause(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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if err := s.p.pause(ctx); err != nil {
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return err
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}
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return s.transition("paused")
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}
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func (s *runningState) Resume(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot resume a running process")
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}
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func (s *runningState) Update(context context.Context, r *shimapi.UpdateTaskRequest) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.update(context, r)
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}
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func (s *runningState) Checkpoint(ctx context.Context, r *shimapi.CheckpointTaskRequest) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.checkpoint(ctx, r)
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}
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func (s *runningState) Resize(ws console.WinSize) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.resize(ws)
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}
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func (s *runningState) Start(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot start a running process")
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}
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func (s *runningState) Delete(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot delete a running process")
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}
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func (s *runningState) Kill(ctx context.Context, sig uint32, all bool) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.kill(ctx, sig, all)
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}
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func (s *runningState) SetExited(status int) {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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s.p.setExited(status)
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if err := s.transition("stopped"); err != nil {
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panic(err)
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}
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}
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type pausedState struct {
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p *initProcess
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}
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func (s *pausedState) transition(name string) error {
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switch name {
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case "running":
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s.p.initState = &runningState{p: s.p}
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case "stopped":
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s.p.initState = &stoppedState{p: s.p}
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default:
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return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
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}
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return nil
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}
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func (s *pausedState) Pause(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot pause a paused container")
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}
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func (s *pausedState) Resume(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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if err := s.p.resume(ctx); err != nil {
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return err
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}
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return s.transition("running")
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}
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func (s *pausedState) Update(context context.Context, r *shimapi.UpdateTaskRequest) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.update(context, r)
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}
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func (s *pausedState) Checkpoint(ctx context.Context, r *shimapi.CheckpointTaskRequest) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.checkpoint(ctx, r)
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}
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func (s *pausedState) Resize(ws console.WinSize) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.resize(ws)
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}
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func (s *pausedState) Start(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot start a paused process")
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}
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func (s *pausedState) Delete(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot delete a paused process")
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}
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func (s *pausedState) Kill(ctx context.Context, sig uint32, all bool) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.kill(ctx, sig, all)
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}
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func (s *pausedState) SetExited(status int) {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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s.p.setExited(status)
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if err := s.transition("stopped"); err != nil {
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panic(err)
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}
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}
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type stoppedState struct {
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p *initProcess
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}
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func (s *stoppedState) transition(name string) error {
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switch name {
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case "deleted":
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s.p.initState = &deletedState{}
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default:
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return errors.Errorf("invalid state transition %q to %q", stateName(s), name)
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}
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return nil
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}
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func (s *stoppedState) Pause(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot pause a stopped container")
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}
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func (s *stoppedState) Resume(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot resume a stopped container")
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}
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func (s *stoppedState) Update(context context.Context, r *shimapi.UpdateTaskRequest) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot update a stopped container")
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}
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func (s *stoppedState) Checkpoint(ctx context.Context, r *shimapi.CheckpointTaskRequest) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot checkpoint a stopped container")
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}
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func (s *stoppedState) Resize(ws console.WinSize) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot resize a stopped container")
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}
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func (s *stoppedState) Start(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return errors.Errorf("cannot start a stopped process")
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}
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func (s *stoppedState) Delete(ctx context.Context) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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if err := s.p.delete(ctx); err != nil {
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return err
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}
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return s.transition("deleted")
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}
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func (s *stoppedState) Kill(ctx context.Context, sig uint32, all bool) error {
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s.p.mu.Lock()
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defer s.p.mu.Unlock()
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return s.p.kill(ctx, sig, all)
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}
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func (s *stoppedState) SetExited(status int) {
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// no op
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}
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