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package utils
import (
"context"
"fmt"
"net/http"
"strconv"
"time"
"github.com/containers/podman/v3/libpod/events"
api "github.com/containers/podman/v3/pkg/api/types"
"github.com/containers/podman/v3/pkg/domain/entities"
"github.com/containers/podman/v3/pkg/domain/infra/abi"
"github.com/containers/podman/v3/pkg/api/handlers"
"github.com/sirupsen/logrus"
"github.com/containers/podman/v3/libpod/define"
"github.com/containers/podman/v3/libpod"
"github.com/gorilla/schema"
"github.com/pkg/errors"
)
type waitQueryDocker struct {
Condition string `schema:"condition"`
}
type waitQueryLibpod struct {
Interval string `schema:"interval"`
Condition []define.ContainerStatus `schema:"condition"`
}
func WaitContainerDocker(w http.ResponseWriter, r *http.Request) {
var err error
ctx := r.Context()
query := waitQueryDocker{}
decoder := ctx.Value(api.DecoderKey).(*schema.Decoder)
if err = decoder.Decode(&query, r.URL.Query()); err != nil {
Error(w, "Something went wrong.", http.StatusBadRequest, errors.Wrapf(err, "failed to parse parameters for %s", r.URL.String()))
return
}
interval := time.Nanosecond
condition := "not-running"
if _, found := r.URL.Query()["condition"]; found {
condition = query.Condition
if !isValidDockerCondition(query.Condition) {
BadRequest(w, "condition", condition, errors.New("not a valid docker condition"))
return
}
}
name := GetName(r)
exists, err := containerExists(ctx, name)
if err != nil {
InternalServerError(w, err)
return
}
if !exists {
ContainerNotFound(w, name, define.ErrNoSuchCtr)
return
}
// In docker compatibility mode we have to send headers in advance,
// otherwise docker client would freeze.
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(200)
if flusher, ok := w.(http.Flusher); ok {
flusher.Flush()
}
exitCode, err := waitDockerCondition(ctx, name, interval, condition)
var errStruct *struct{ Message string }
if err != nil {
logrus.Errorf("While waiting on condition: %q", err)
errStruct = &struct {
Message string
}{
Message: err.Error(),
}
}
responseData := handlers.ContainerWaitOKBody{
StatusCode: int(exitCode),
Error: errStruct,
}
enc := json.NewEncoder(w)
enc.SetEscapeHTML(true)
err = enc.Encode(&responseData)
if err != nil {
logrus.Errorf("Unable to write json: %q", err)
}
}
func WaitContainerLibpod(w http.ResponseWriter, r *http.Request) {
var (
err error
interval = time.Millisecond * 250
conditions = []define.ContainerStatus{define.ContainerStateStopped, define.ContainerStateExited}
)
decoder := r.Context().Value(api.DecoderKey).(*schema.Decoder)
query := waitQueryLibpod{}
if err := decoder.Decode(&query, r.URL.Query()); err != nil {
Error(w, "Something went wrong.", http.StatusBadRequest, errors.Wrapf(err, "failed to parse parameters for %s", r.URL.String()))
return
}
if _, found := r.URL.Query()["interval"]; found {
interval, err = time.ParseDuration(query.Interval)
if err != nil {
InternalServerError(w, err)
return
}
}
if _, found := r.URL.Query()["condition"]; found {
if len(query.Condition) > 0 {
conditions = query.Condition
}
}
name := GetName(r)
waitFn := createContainerWaitFn(r.Context(), name, interval)
exitCode, err := waitFn(conditions...)
if err != nil {
if errors.Cause(err) == define.ErrNoSuchCtr {
ContainerNotFound(w, name, err)
return
}
InternalServerError(w, err)
return
}
WriteResponse(w, http.StatusOK, strconv.Itoa(int(exitCode)))
}
type containerWaitFn func(conditions ...define.ContainerStatus) (int32, error)
func createContainerWaitFn(ctx context.Context, containerName string, interval time.Duration) containerWaitFn {
runtime := ctx.Value(api.RuntimeKey).(*libpod.Runtime)
var containerEngine entities.ContainerEngine = &abi.ContainerEngine{Libpod: runtime}
return func(conditions ...define.ContainerStatus) (int32, error) {
opts := entities.WaitOptions{
Condition: conditions,
Interval: interval,
}
ctrWaitReport, err := containerEngine.ContainerWait(ctx, []string{containerName}, opts)
if err != nil {
return -1, err
}
if len(ctrWaitReport) != 1 {
return -1, fmt.Errorf("the ContainerWait() function returned unexpected count of reports: %d", len(ctrWaitReport))
}
return ctrWaitReport[0].ExitCode, ctrWaitReport[0].Error
}
}
func isValidDockerCondition(cond string) bool {
switch cond {
case "next-exit", "removed", "not-running", "":
return true
}
return false
}
func waitDockerCondition(ctx context.Context, containerName string, interval time.Duration, dockerCondition string) (int32, error) {
containerWait := createContainerWaitFn(ctx, containerName, interval)
var err error
var code int32
switch dockerCondition {
case "next-exit":
code, err = waitNextExit(ctx, containerName)
case "removed":
code, err = waitRemoved(containerWait)
case "not-running", "":
code, err = waitNotRunning(containerWait)
default:
panic("not a valid docker condition")
}
return code, err
}
var notRunningStates = []define.ContainerStatus{
define.ContainerStateCreated,
define.ContainerStateRemoving,
define.ContainerStateStopped,
define.ContainerStateExited,
define.ContainerStateConfigured,
}
func waitRemoved(ctrWait containerWaitFn) (int32, error) {
code, err := ctrWait(define.ContainerStateUnknown)
if err != nil && errors.Cause(err) == define.ErrNoSuchCtr {
return code, nil
}
return code, err
}
func waitNextExit(ctx context.Context, containerName string) (int32, error) {
runtime := ctx.Value(api.RuntimeKey).(*libpod.Runtime)
containerEngine := &abi.ContainerEngine{Libpod: runtime}
eventChannel := make(chan *events.Event)
errChannel := make(chan error)
opts := entities.EventsOptions{
EventChan: eventChannel,
Filter: []string{"event=died", fmt.Sprintf("container=%s", containerName)},
Stream: true,
}
// ctx is used to cancel event watching goroutine
ctx, cancel := context.WithCancel(ctx)
defer cancel()
go func() {
errChannel <- containerEngine.Events(ctx, opts)
}()
evt, ok := <-eventChannel
if ok {
return int32(evt.ContainerExitCode), nil
}
// if ok == false then containerEngine.Events() has exited
// it may happen if request was canceled (e.g. client closed connection prematurely) or
// the server is in process of shutting down
return -1, <-errChannel
}
func waitNotRunning(ctrWait containerWaitFn) (int32, error) {
return ctrWait(notRunningStates...)
}
func containerExists(ctx context.Context, name string) (bool, error) {
runtime := ctx.Value(api.RuntimeKey).(*libpod.Runtime)
var containerEngine entities.ContainerEngine = &abi.ContainerEngine{Libpod: runtime}
var ctrExistsOpts entities.ContainerExistsOptions
ctrExistRep, err := containerEngine.ContainerExists(ctx, name, ctrExistsOpts)
if err != nil {
return false, err
}
return ctrExistRep.Value, nil
}
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