containerd/execution/service.go

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package execution
import (
"fmt"
"os"
"syscall"
"time"
api "github.com/docker/containerd/api/execution"
"github.com/docker/containerd/events"
google_protobuf "github.com/golang/protobuf/ptypes/empty"
"github.com/opencontainers/runtime-spec/specs-go"
"golang.org/x/net/context"
)
var (
emptyResponse = &google_protobuf.Empty{}
)
func New(ctx context.Context, executor Executor) (*Service, error) {
svc := &Service{
executor: executor,
}
// List existing container, some of them may have died away if
// we've been restarted
containers, err := executor.List(ctx)
if err != nil {
return nil, err
}
for _, c := range containers {
status := c.Status()
// generate exit event for all processes, (generate event for init last)
processes := c.Processes()
processes = append(processes[1:], processes[0])
for _, p := range c.processes {
if status == Stopped || status == Deleted {
if p.Status() != Stopped {
p.Signal(os.Kill)
}
sc, err := p.Wait()
if err != nil {
sc = UnknownStatusCode
}
topic := GetContainerProcessEventTopic(c.ID(), p.ID())
svc.publishEvent(ctx, topic, &ContainerExitEvent{
ContainerEvent: ContainerEvent{
Timestamp: time.Now(),
ID: c.ID(),
Action: "exit",
},
PID: p.ID(),
StatusCode: sc,
})
} else {
svc.monitorProcess(ctx, c, p)
}
}
}
return svc, nil
}
type Service struct {
executor Executor
}
func (s *Service) Create(ctx context.Context, r *api.CreateContainerRequest) (*api.CreateContainerResponse, error) {
var err error
container, err := s.executor.Create(ctx, r.ID, CreateOpts{
Bundle: r.BundlePath,
Console: r.Console,
Stdin: r.Stdin,
Stdout: r.Stdout,
Stderr: r.Stderr,
})
if err != nil {
return nil, err
}
procs := container.Processes()
initProcess := procs[0]
s.monitorProcess(ctx, container, initProcess)
return &api.CreateContainerResponse{
Container: toGRPCContainer(container),
InitProcess: toGRPCProcess(initProcess),
}, nil
}
func (s *Service) Delete(ctx context.Context, r *api.DeleteContainerRequest) (*google_protobuf.Empty, error) {
container, err := s.executor.Load(ctx, r.ID)
if err != nil {
return emptyResponse, err
}
if err = s.executor.Delete(ctx, container); err != nil {
return emptyResponse, err
}
return emptyResponse, nil
}
func (s *Service) List(ctx context.Context, r *api.ListContainersRequest) (*api.ListContainersResponse, error) {
containers, err := s.executor.List(ctx)
if err != nil {
return nil, err
}
resp := &api.ListContainersResponse{}
for _, c := range containers {
resp.Containers = append(resp.Containers, toGRPCContainer(c))
}
return resp, nil
}
func (s *Service) Get(ctx context.Context, r *api.GetContainerRequest) (*api.GetContainerResponse, error) {
container, err := s.executor.Load(ctx, r.ID)
if err != nil {
return nil, err
}
return &api.GetContainerResponse{
Container: toGRPCContainer(container),
}, nil
}
func (s *Service) Update(ctx context.Context, r *api.UpdateContainerRequest) (*google_protobuf.Empty, error) {
return emptyResponse, nil
}
func (s *Service) Pause(ctx context.Context, r *api.PauseContainerRequest) (*google_protobuf.Empty, error) {
container, err := s.executor.Load(ctx, r.ID)
if err != nil {
return nil, err
}
return emptyResponse, s.executor.Pause(ctx, container)
}
func (s *Service) Resume(ctx context.Context, r *api.ResumeContainerRequest) (*google_protobuf.Empty, error) {
container, err := s.executor.Load(ctx, r.ID)
if err != nil {
return nil, err
}
return emptyResponse, s.executor.Resume(ctx, container)
}
func (s *Service) Start(ctx context.Context, r *api.StartContainerRequest) (*google_protobuf.Empty, error) {
container, err := s.executor.Load(ctx, r.ID)
if err != nil {
return nil, err
}
return emptyResponse, s.executor.Start(ctx, container)
}
func (s *Service) StartProcess(ctx context.Context, r *api.StartProcessRequest) (*api.StartProcessResponse, error) {
container, err := s.executor.Load(ctx, r.ContainerID)
if err != nil {
return nil, err
}
spec := specs.Process{
Terminal: r.Process.Terminal,
ConsoleSize: specs.Box{
Height: 80,
Width: 80,
},
Args: r.Process.Args,
Env: r.Process.Env,
Cwd: r.Process.Cwd,
NoNewPrivileges: true,
}
process, err := s.executor.StartProcess(ctx, container, StartProcessOpts{
ID: r.Process.ID,
Spec: spec,
Console: r.Console,
Stdin: r.Stdin,
Stdout: r.Stdout,
Stderr: r.Stderr,
})
if err != nil {
return nil, err
}
s.monitorProcess(ctx, container, process)
return &api.StartProcessResponse{
Process: toGRPCProcess(process),
}, nil
}
// containerd managed execs + system pids forked in container
func (s *Service) GetProcess(ctx context.Context, r *api.GetProcessRequest) (*api.GetProcessResponse, error) {
container, err := s.executor.Load(ctx, r.ContainerID)
if err != nil {
return nil, err
}
process := container.GetProcess(r.ProcessID)
if process == nil {
return nil, ErrProcessNotFound
}
return &api.GetProcessResponse{
Process: toGRPCProcess(process),
}, nil
}
func (s *Service) SignalProcess(ctx context.Context, r *api.SignalProcessRequest) (*google_protobuf.Empty, error) {
container, err := s.executor.Load(ctx, r.ContainerID)
if err != nil {
return emptyResponse, err
}
process := container.GetProcess(r.ProcessID)
if process == nil {
return nil, fmt.Errorf("Make me a constant! Process not found!")
}
return emptyResponse, process.Signal(syscall.Signal(r.Signal))
}
func (s *Service) DeleteProcess(ctx context.Context, r *api.DeleteProcessRequest) (*google_protobuf.Empty, error) {
container, err := s.executor.Load(ctx, r.ContainerID)
if err != nil {
return emptyResponse, err
}
if err := s.executor.DeleteProcess(ctx, container, r.ProcessID); err != nil {
return emptyResponse, err
}
return emptyResponse, nil
}
func (s *Service) ListProcesses(ctx context.Context, r *api.ListProcessesRequest) (*api.ListProcessesResponse, error) {
container, err := s.executor.Load(ctx, r.ID)
if err != nil {
return nil, err
}
processes := container.Processes()
return &api.ListProcessesResponse{
Processes: toGRPCProcesses(processes),
}, nil
}
var (
_ = (api.ExecutionServiceServer)(&Service{})
)
func (s *Service) publishEvent(ctx context.Context, topic string, v interface{}) {
ctx = events.WithTopic(ctx, topic)
events.GetPoster(ctx).Post(ctx, v)
}
func (s *Service) monitorProcess(ctx context.Context, container *Container, process Process) {
go func() {
status, err := process.Wait()
if err == nil {
topic := GetContainerProcessEventTopic(container.ID(), process.ID())
s.publishEvent(ctx, topic, &ContainerExitEvent{
ContainerEvent: ContainerEvent{
Timestamp: time.Now(),
ID: container.ID(),
Action: "exit",
},
PID: process.ID(),
StatusCode: status,
})
}
}()
}
func GetContainerEventTopic(id string) string {
return fmt.Sprintf(containerEventsTopicFormat, id)
}
func GetContainerProcessEventTopic(containerID, processID string) string {
return fmt.Sprintf(containerProcessEventsTopicFormat, containerID, processID)
}
func toGRPCContainer(container *Container) *api.Container {
c := &api.Container{
ID: container.ID(),
BundlePath: container.Bundle(),
}
status := container.Status()
switch status {
case "created":
c.Status = api.Status_CREATED
case "running":
c.Status = api.Status_RUNNING
case "stopped":
c.Status = api.Status_STOPPED
case "paused":
c.Status = api.Status_PAUSED
}
return c
}
func toGRPCProcesses(processes []Process) []*api.Process {
var out []*api.Process
for _, p := range processes {
out = append(out, toGRPCProcess(p))
}
return out
}
func toGRPCProcess(process Process) *api.Process {
return &api.Process{
ID: process.ID(),
Pid: process.Pid(),
}
}