Return exit status from Wait of stopped process

This changes Wait() from returning an error whenever you call wait on a
stopped process/task to returning the exit status from the process.

This also adds the exit status to the Status() call on a process/task so
that a user can Wait(), check status, then cancel the wait to avoid
races in event handling.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
This commit is contained in:
Michael Crosby 2017-08-03 17:09:16 -04:00
parent 0fa76584f8
commit 9f13b414b9
16 changed files with 283 additions and 178 deletions

View File

@ -43,6 +43,7 @@ const (
StatusRunning Status = 2
StatusStopped Status = 3
StatusPaused Status = 4
StatusPausing Status = 5
)
var Status_name = map[int32]string{
@ -51,6 +52,7 @@ var Status_name = map[int32]string{
2: "RUNNING",
3: "STOPPED",
4: "PAUSED",
5: "PAUSING",
}
var Status_value = map[string]int32{
"UNKNOWN": 0,
@ -58,6 +60,7 @@ var Status_value = map[string]int32{
"RUNNING": 2,
"STOPPED": 3,
"PAUSED": 4,
"PAUSING": 5,
}
func (x Status) String() string {
@ -74,6 +77,7 @@ type Process struct {
Stdout string `protobuf:"bytes,6,opt,name=stdout,proto3" json:"stdout,omitempty"`
Stderr string `protobuf:"bytes,7,opt,name=stderr,proto3" json:"stderr,omitempty"`
Terminal bool `protobuf:"varint,8,opt,name=terminal,proto3" json:"terminal,omitempty"`
ExitStatus uint32 `protobuf:"varint,9,opt,name=exit_status,json=exitStatus,proto3" json:"exit_status,omitempty"`
}
func (m *Process) Reset() { *m = Process{} }
@ -149,6 +153,11 @@ func (m *Process) MarshalTo(dAtA []byte) (int, error) {
}
i++
}
if m.ExitStatus != 0 {
dAtA[i] = 0x48
i++
i = encodeVarintTask(dAtA, i, uint64(m.ExitStatus))
}
return i, nil
}
@ -211,6 +220,9 @@ func (m *Process) Size() (n int) {
if m.Terminal {
n += 2
}
if m.ExitStatus != 0 {
n += 1 + sovTask(uint64(m.ExitStatus))
}
return n
}
@ -240,6 +252,7 @@ func (this *Process) String() string {
`Stdout:` + fmt.Sprintf("%v", this.Stdout) + `,`,
`Stderr:` + fmt.Sprintf("%v", this.Stderr) + `,`,
`Terminal:` + fmt.Sprintf("%v", this.Terminal) + `,`,
`ExitStatus:` + fmt.Sprintf("%v", this.ExitStatus) + `,`,
`}`,
}, "")
return s
@ -484,6 +497,25 @@ func (m *Process) Unmarshal(dAtA []byte) error {
}
}
m.Terminal = bool(v != 0)
case 9:
if wireType != 0 {
return fmt.Errorf("proto: wrong wireType = %d for field ExitStatus", wireType)
}
m.ExitStatus = 0
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowTask
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := dAtA[iNdEx]
iNdEx++
m.ExitStatus |= (uint32(b) & 0x7F) << shift
if b < 0x80 {
break
}
}
default:
iNdEx = preIndex
skippy, err := skipTask(dAtA[iNdEx:])
@ -615,33 +647,34 @@ func init() {
}
var fileDescriptorTask = []byte{
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}

View File

@ -14,6 +14,7 @@ enum Status {
RUNNING = 2 [(gogoproto.enumvalue_customname) = "StatusRunning"];
STOPPED = 3 [(gogoproto.enumvalue_customname) = "StatusStopped"];
PAUSED = 4 [(gogoproto.enumvalue_customname) = "StatusPaused"];
PAUSING = 5 [(gogoproto.enumvalue_customname) = "StatusPausing"];
}
message Process {
@ -25,4 +26,5 @@ message Process {
string stdout = 6;
string stderr = 7;
bool terminal = 8;
uint32 exit_status = 9;
}

View File

@ -264,7 +264,7 @@ func TestCheckpointLeaveRunning(t *testing.T) {
t.Error(err)
return
}
if status != Running {
if status.Status != Running {
t.Errorf("expected status %q but received %q", Running, status)
return
}

View File

@ -59,7 +59,7 @@ func deleteContainer(ctx context.Context, client *containerd.Client, id string,
if err != nil {
return err
}
if status == containerd.Stopped || status == containerd.Created {
if status.Status == containerd.Stopped || status.Status == containerd.Created {
if _, err := task.Delete(ctx); err != nil {
return err
}

View File

@ -1028,13 +1028,13 @@ func TestWaitStoppedTask(t *testing.T) {
}
// wait for the task to stop then call wait again
<-statusC
_, err = task.Wait(ctx)
if err == nil {
t.Error("Wait after task exits should return an error")
status, err := task.Wait(ctx)
if err != nil {
t.Error(err)
return
}
if !errdefs.IsUnavailable(err) {
t.Errorf("Wait should return %q when task Stopped: %v", errdefs.ErrUnavailable, err)
if status != 7 {
t.Errorf("exit status from stopped task should be 7 but received %d", status)
}
}
@ -1119,13 +1119,13 @@ func TestWaitStoppedProcess(t *testing.T) {
// wait for the exec to return
<-processStatusC
// try to wait on the process after it has stopped
_, err = process.Wait(ctx)
if err == nil {
t.Error("Wait after process exits should return an error")
status, err := process.Wait(ctx)
if err != nil {
t.Error(err)
return
}
if !errdefs.IsUnavailable(err) {
t.Errorf("Wait should return %q when process has exited: %v", errdefs.ErrUnavailable, err)
if status != 6 {
t.Errorf("exit status from stopped process should be 6 but received %d", status)
}
if err := task.Kill(ctx, syscall.SIGKILL); err != nil {
t.Error(err)

View File

@ -49,7 +49,8 @@ func (p *Process) State(ctx context.Context) (runtime.State, error) {
status = runtime.StoppedStatus
case task.StatusPaused:
status = runtime.PausedStatus
// TODO: containerd.DeletedStatus
case task.StatusPausing:
status = runtime.PausingStatus
}
return runtime.State{
Pid: response.Pid,
@ -58,6 +59,7 @@ func (p *Process) State(ctx context.Context) (runtime.State, error) {
Stdout: response.Stdout,
Stderr: response.Stderr,
Terminal: response.Terminal,
ExitStatus: response.ExitStatus,
}, nil
}

View File

@ -247,6 +247,8 @@ func (s *Service) State(ctx context.Context, r *shimapi.StateRequest) (*shimapi.
status = task.StatusStopped
case "paused":
status = task.StatusPaused
case "pausing":
status = task.StatusPausing
}
sio := p.Stdio()
return &shimapi.StateResponse{
@ -258,6 +260,7 @@ func (s *Service) State(ctx context.Context, r *shimapi.StateRequest) (*shimapi.
Stdout: sio.stdout,
Stderr: sio.stderr,
Terminal: sio.terminal,
ExitStatus: uint32(p.ExitStatus()),
}, nil
}

View File

@ -157,6 +157,7 @@ type StateResponse struct {
Stdout string `protobuf:"bytes,6,opt,name=stdout,proto3" json:"stdout,omitempty"`
Stderr string `protobuf:"bytes,7,opt,name=stderr,proto3" json:"stderr,omitempty"`
Terminal bool `protobuf:"varint,8,opt,name=terminal,proto3" json:"terminal,omitempty"`
ExitStatus uint32 `protobuf:"varint,9,opt,name=exit_status,json=exitStatus,proto3" json:"exit_status,omitempty"`
}
func (m *StateResponse) Reset() { *m = StateResponse{} }
@ -1183,6 +1184,11 @@ func (m *StateResponse) MarshalTo(dAtA []byte) (int, error) {
}
i++
}
if m.ExitStatus != 0 {
dAtA[i] = 0x48
i++
i = encodeVarintShim(dAtA, i, uint64(m.ExitStatus))
}
return i, nil
}
@ -1660,6 +1666,9 @@ func (m *StateResponse) Size() (n int) {
if m.Terminal {
n += 2
}
if m.ExitStatus != 0 {
n += 1 + sovShim(uint64(m.ExitStatus))
}
return n
}
@ -1895,6 +1904,7 @@ func (this *StateResponse) String() string {
`Stdout:` + fmt.Sprintf("%v", this.Stdout) + `,`,
`Stderr:` + fmt.Sprintf("%v", this.Stderr) + `,`,
`Terminal:` + fmt.Sprintf("%v", this.Terminal) + `,`,
`ExitStatus:` + fmt.Sprintf("%v", this.ExitStatus) + `,`,
`}`,
}, "")
return s
@ -3331,6 +3341,25 @@ func (m *StateResponse) Unmarshal(dAtA []byte) error {
}
}
m.Terminal = bool(v != 0)
case 9:
if wireType != 0 {
return fmt.Errorf("proto: wrong wireType = %d for field ExitStatus", wireType)
}
m.ExitStatus = 0
for shift := uint(0); ; shift += 7 {
if shift >= 64 {
return ErrIntOverflowShim
}
if iNdEx >= l {
return io.ErrUnexpectedEOF
}
b := dAtA[iNdEx]
iNdEx++
m.ExitStatus |= (uint32(b) & 0x7F) << shift
if b < 0x80 {
break
}
}
default:
iNdEx = preIndex
skippy, err := skipShim(dAtA[iNdEx:])
@ -4311,72 +4340,73 @@ func init() {
}
var fileDescriptorShim = []byte{
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0xf6, 0xae, 0x69, 0xfc, 0x71, 0xd7, 0x34, 0xfe, 0xbe, 0x6b, 0x1a, 0xdf, 0xed, 0x2e, 0xf7, 0xef,
0xd8, 0x67, 0xe2, 0xf7, 0xbc, 0x24, 0xb7, 0xdf, 0xfd, 0x2f, 0x00, 0x00, 0xff, 0xff, 0x53, 0xf2,
0x71, 0x3d, 0xcc, 0x0d, 0x00, 0x00,
}

View File

@ -108,6 +108,7 @@ message StateResponse {
string stdout = 6;
string stderr = 7;
bool terminal = 8;
uint32 exit_status = 9;
}
message KillRequest {

View File

@ -66,6 +66,8 @@ func (t *Task) State(ctx context.Context) (runtime.State, error) {
status = runtime.StoppedStatus
case task.StatusPaused:
status = runtime.PausedStatus
case task.StatusPausing:
status = runtime.PausingStatus
}
return runtime.State{
Pid: response.Pid,
@ -74,6 +76,7 @@ func (t *Task) State(ctx context.Context) (runtime.State, error) {
Stdout: response.Stdout,
Stderr: response.Stderr,
Terminal: response.Terminal,
ExitStatus: response.ExitStatus,
}, nil
}

View File

@ -76,8 +76,12 @@ func (p *process) Wait(ctx context.Context) (uint32, error) {
return UnknownExitStatus, err
}
// first check if the task has exited
if status, _ := p.Status(ctx); status == Stopped {
return UnknownExitStatus, errdefs.ErrUnavailable
status, err := p.Status(ctx)
if err != nil {
return UnknownExitStatus, errdefs.FromGRPC(err)
}
if status.Status == Stopped {
return status.ExitStatus, nil
}
for {
evt, err := eventstream.Recv()
@ -146,7 +150,10 @@ func (p *process) Status(ctx context.Context) (Status, error) {
ExecID: p.id,
})
if err != nil {
return "", errdefs.FromGRPC(err)
return Status{}, errdefs.FromGRPC(err)
}
return Status(strings.ToLower(r.Process.Status.String())), nil
return Status{
Status: ProcessStatus(strings.ToLower(r.Process.Status.String())),
ExitStatus: r.Process.ExitStatus,
}, nil
}

View File

@ -68,6 +68,7 @@ const (
StoppedStatus
DeletedStatus
PausedStatus
PausingStatus
)
type State struct {
@ -75,6 +76,9 @@ type State struct {
Status Status
// Pid is the main process id for the container
Pid uint32
// ExitStatus of the process
// Only vaid if the Status is Stopped
ExitStatus uint32
Stdin string
Stdout string
Stderr string

View File

@ -227,6 +227,8 @@ func processFromContainerd(ctx context.Context, p runtime.Process) (*task.Proces
status = task.StatusStopped
case runtime.PausedStatus:
status = task.StatusPaused
case runtime.PausingStatus:
status = task.StatusPausing
default:
log.G(ctx).WithField("status", state.Status).Warn("unknown status")
}
@ -238,6 +240,7 @@ func processFromContainerd(ctx context.Context, p runtime.Process) (*task.Proces
Stdout: state.Stdout,
Stderr: state.Stderr,
Terminal: state.Terminal,
ExitStatus: state.ExitStatus,
}, nil
}

33
task.go
View File

@ -28,14 +28,19 @@ import (
const UnknownExitStatus = 255
type Status string
type Status struct {
Status ProcessStatus
ExitStatus uint32
}
type ProcessStatus string
const (
Running Status = "running"
Created Status = "created"
Stopped Status = "stopped"
Paused Status = "paused"
Pausing Status = "pausing"
Running ProcessStatus = "running"
Created ProcessStatus = "created"
Stopped ProcessStatus = "stopped"
Paused ProcessStatus = "paused"
Pausing ProcessStatus = "pausing"
)
type IOCloseInfo struct {
@ -146,12 +151,14 @@ func (t *task) Status(ctx context.Context) (Status, error) {
ContainerID: t.id,
})
if err != nil {
return "", errdefs.FromGRPC(err)
return Status{}, errdefs.FromGRPC(err)
}
return Status(strings.ToLower(r.Process.Status.String())), nil
return Status{
Status: ProcessStatus(strings.ToLower(r.Process.Status.String())),
ExitStatus: r.Process.ExitStatus,
}, nil
}
// Wait is a blocking call that will wait for the task to exit and return the exit status
func (t *task) Wait(ctx context.Context) (uint32, error) {
eventstream, err := t.client.EventService().Subscribe(ctx, &eventsapi.SubscribeRequest{
Filters: []string{"topic==" + runtime.TaskExitEventTopic},
@ -160,8 +167,12 @@ func (t *task) Wait(ctx context.Context) (uint32, error) {
return UnknownExitStatus, errdefs.FromGRPC(err)
}
// first check if the task has exited
if status, _ := t.Status(ctx); status == Stopped {
return UnknownExitStatus, errdefs.ErrUnavailable
status, err := t.Status(ctx)
if err != nil {
return UnknownExitStatus, errdefs.FromGRPC(err)
}
if status.Status == Stopped {
return status.ExitStatus, nil
}
for {
evt, err := eventstream.Recv()

View File

@ -45,6 +45,7 @@ func (p *process) State(ctx context.Context) (runtime.State, error) {
Stdout: p.io.src.Stdout,
Stderr: p.io.src.Stderr,
Terminal: p.io.src.Terminal,
ExitStatus: p.exitCode,
}, nil
}

View File

@ -44,10 +44,14 @@ func (t *task) ID() string {
}
func (t *task) State(ctx context.Context) (runtime.State, error) {
var status runtime.Status
var (
status runtime.Status
exitStatus uint32
)
if p := t.getProcess(t.id); p != nil {
status = p.Status()
exitStatus = p.exitCode
} else {
status = t.getStatus()
}
@ -59,6 +63,7 @@ func (t *task) State(ctx context.Context) (runtime.State, error) {
Stdout: t.io.src.Stdout,
Stderr: t.io.src.Stderr,
Terminal: t.io.src.Terminal,
ExitStatus: exitStatus,
}, nil
}