157 lines
3.6 KiB
Go
157 lines
3.6 KiB
Go
/*
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Copyright The containerd Authors.
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Copyright 2018 Google LLC
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package proc
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import (
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"context"
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"github.com/containerd/console"
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"github.com/pkg/errors"
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)
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type execState interface {
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Resize(console.WinSize) error
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Start(context.Context) error
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Delete(context.Context) error
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Kill(context.Context, uint32, bool) error
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SetExited(int)
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}
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type execCreatedState struct {
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p *execProcess
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}
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func (s *execCreatedState) transition(name string) error {
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switch name {
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case "running":
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s.p.execState = &execRunningState{p: s.p}
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case "stopped":
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s.p.execState = &execStoppedState{p: s.p}
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case "deleted":
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s.p.execState = &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 *execCreatedState) Resize(ws console.WinSize) error {
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return s.p.resize(ws)
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}
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func (s *execCreatedState) Start(ctx context.Context) error {
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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 *execCreatedState) Delete(ctx context.Context) error {
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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 *execCreatedState) Kill(ctx context.Context, sig uint32, all bool) error {
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return s.p.kill(ctx, sig, all)
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}
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func (s *execCreatedState) SetExited(status int) {
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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 execRunningState struct {
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p *execProcess
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}
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func (s *execRunningState) transition(name string) error {
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switch name {
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case "stopped":
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s.p.execState = &execStoppedState{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 *execRunningState) Resize(ws console.WinSize) error {
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return s.p.resize(ws)
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}
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func (s *execRunningState) Start(ctx context.Context) error {
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return errors.Errorf("cannot start a running process")
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}
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func (s *execRunningState) Delete(ctx context.Context) error {
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return errors.Errorf("cannot delete a running process")
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}
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func (s *execRunningState) Kill(ctx context.Context, sig uint32, all bool) error {
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return s.p.kill(ctx, sig, all)
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}
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func (s *execRunningState) SetExited(status int) {
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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 execStoppedState struct {
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p *execProcess
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}
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func (s *execStoppedState) transition(name string) error {
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switch name {
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case "deleted":
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s.p.execState = &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 *execStoppedState) Resize(ws console.WinSize) error {
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return errors.Errorf("cannot resize a stopped container")
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}
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func (s *execStoppedState) Start(ctx context.Context) error {
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return errors.Errorf("cannot start a stopped process")
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}
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func (s *execStoppedState) Delete(ctx context.Context) error {
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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 *execStoppedState) Kill(ctx context.Context, sig uint32, all bool) error {
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return s.p.kill(ctx, sig, all)
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}
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func (s *execStoppedState) SetExited(status int) {
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// no op
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}
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