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