v2 api: top improvements

* Use `pkg/adapter` to increase code reuse and reduce code redundancy.
* Extend swagger docs to mention AIX descriptors.
* Document the libpod endpoint which shares the same handler.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

pkg/adapter/containers.go

@@ -927,9 +927,7 @@ func (r *LocalRuntime) Top(cli *cliconfig.TopValues) ([]string, error) {
 
 	output, err = r.execPS(container, descriptors)
 	if err != nil {
-		// Note: return psgoErr to guide users into using the AIX descriptors
-		// instead of using ps(1).
-		return nil, psgoErr
+		return nil, errors.Wrapf(err, "error executing ps(1) in the container")
 	}
 
 	// Trick: filter the ps command from the output instead of
@@ -956,10 +954,8 @@ func (r *LocalRuntime) execPS(c *libpod.Container, args []string) ([]string, err
 	streams := new(libpod.AttachStreams)
 	streams.OutputStream = wPipe
 	streams.ErrorStream = wPipe
-	streams.InputStream = bufio.NewReader(os.Stdin)
 	streams.AttachOutput = true
 	streams.AttachError = true
-	streams.AttachInput = true
 
 	psOutput := []string{}
 	go func() {

pkg/api/handlers/containers_top.go

@@ -4,8 +4,10 @@ import (
 	"net/http"
 	"strings"
 
+	"github.com/containers/libpod/cmd/podman/cliconfig"
 	"github.com/containers/libpod/libpod"
 	"github.com/containers/libpod/libpod/define"
+	"github.com/containers/libpod/pkg/adapter"
 	"github.com/containers/libpod/pkg/api/handlers/utils"
 	"github.com/gorilla/mux"
 	"github.com/gorilla/schema"
@@ -28,24 +30,19 @@ func TopContainer(w http.ResponseWriter, r *http.Request) {
 	}
 
 	name := mux.Vars(r)["name"]
-	ctnr, err := runtime.LookupContainer(name)
-	if err != nil {
-		utils.ContainerNotFound(w, name, err)
-		return
-	}
 
-	state, err := ctnr.State()
-	if err != nil {
-		utils.InternalServerError(w, err)
-		return
-	}
-	if state != define.ContainerStateRunning {
-		utils.ContainerNotRunning(w, name, errors.Errorf("Container %s must be running to perform top operation", name))
-		return
-	}
+	adapterRuntime := adapter.LocalRuntime{}
+	adapterRuntime.Runtime = runtime
 
-	output, err := ctnr.Top([]string{})
+	topValues := cliconfig.TopValues{}
+	topValues.InputArgs = []string{name, query.PsArgs}
+
+	output, err := adapterRuntime.Top(&topValues)
 	if err != nil {
+		if errors.Cause(err) == define.ErrNoSuchCtr {
+			utils.ContainerNotFound(w, name, err)
+			return
+		}
 		utils.InternalServerError(w, err)
 		return
 	}

pkg/api/handlers/types.go

@@ -135,7 +135,6 @@ type Stats struct {
 
 type ContainerTopOKBody struct {
 	dockerContainer.ContainerTopOKBody
-	ID string `json:"Id"`
 }
 
 type PodCreateConfig struct {

pkg/api/server/register_containers.go

@@ -345,7 +345,7 @@ func (s *APIServer) RegisterContainersHandlers(r *mux.Router) error {
 	//  - in: query
 	//    name: ps_args
 	//    type: string
-	//    description: arguments to pass to ps such as aux
+	//    description: arguments to pass to ps such as aux. Requires ps(1) to be installed in the container if no ps(1) compatible AIX descriptors are used.
 	// produces:
 	// - application/json
 	// responses:
@@ -653,6 +653,34 @@ func (s *APIServer) RegisterContainersHandlers(r *mux.Router) error {
 	//   '500':
 	//      "$ref": "#/responses/InternalError"
 	r.HandleFunc(VersionedPath("/libpod/containers/{name:..*}/stats"), APIHandler(s.Context, generic.StatsContainer)).Methods(http.MethodGet)
+	// swagger:operation GET /libpod/containers/{nameOrID}/top containers topContainer
+	//
+	// List processes running inside a container. Note
+	//
+	// ---
+	// parameters:
+	//  - in: path
+	//    name: nameOrID
+	//    required: true
+	//    description: the name or ID of the container
+	//  - in: query
+	//    name: stream
+	//    type: bool
+	//    default: true
+	//    description: Stream the output
+	//    name: ps_args
+	//    type: string
+	//    description: arguments to pass to ps such as aux. Requires ps(1) to be installed in the container if no ps(1) compatible AIX descriptors are used.
+	// produces:
+	// - application/json
+	// responses:
+	//   '200':
+	//     description: no error
+	//       "ref": "#/responses/DockerTopResponse"
+	//   '404':
+	//       "$ref": "#/responses/NoSuchContainer"
+	//   '500':
+	//      "$ref": "#/responses/InternalError"
 	r.HandleFunc(VersionedPath("/libpod/containers/{name:..*}/top"), APIHandler(s.Context, handlers.TopContainer)).Methods(http.MethodGet)
 	// swagger:operation POST /libpod/containers/{nameOrID}/unpause containers libpodUnpauseContainer
 	// ---