add --connector switch, validation

connector/docker.go

@@ -19,7 +19,7 @@ type Docker struct {
 	lock         sync.RWMutex
 }
 
-func NewDocker() *Docker {
+func NewDocker() Connector {
 	// init docker client
 	client, err := api.NewClientFromEnv()
 	if err != nil {

connector/main.go

@@ -7,7 +7,7 @@ import (
 
 var log = logging.Init()
 
-type ContainerSource interface {
+type Connector interface {
 	All() container.Containers
 	Get(string) (*container.Container, bool)
 }

connector/runc.go

@@ -59,7 +59,7 @@ func getFactory(opts RuncOpts) (libcontainer.Factory, error) {
 	return libcontainer.New(opts.root, cgroupManager, libcontainer.CriuPath("criu"))
 }
 
-func NewRunc() *Runc {
+func NewRunc() Connector {
 	opts, err := readRuncOpts()
 	runcFailOnErr(err)
 

cursor.go

@@ -8,16 +8,20 @@ import (
 	ui "github.com/gizak/termui"
 )
 
+var enabledConnectors = map[string]func() connector.Connector{
+	"docker": connector.NewDocker,
+	"runc":   connector.NewRunc,
+}
+
 type GridCursor struct {
 	selectedID string // id of currently selected container
 	filtered   container.Containers
-	cSource    connector.ContainerSource
+	cSource    connector.Connector
 }
 
-func NewGridCursor() *GridCursor {
+func NewGridCursor(connector string) *GridCursor {
 	return &GridCursor{
-		cSource: connector.NewRunc(),
-		//cSource: connector.NewDocker(),
+		cSource: enabledConnectors[connector](),
 	}
 }
 

main.go

@@ -4,6 +4,7 @@ import (
 	"flag"
 	"fmt"
 	"os"
+	"strings"
 
 	"github.com/bcicen/ctop/config"
 	"github.com/bcicen/ctop/container"
@@ -37,8 +38,11 @@ func main() {
 	var sortFieldFlag = flag.String("s", "", "select container sort field")
 	var reverseSortFlag = flag.Bool("r", false, "reverse container sort order")
 	var invertFlag = flag.Bool("i", false, "invert default colors")
+	var connectorFlag = flag.String("connector", "docker", "container connector to use")
 	flag.Parse()
 
+	validConnector(*connectorFlag)
+
 	if *versionFlag {
 		fmt.Println(versionStr)
 		os.Exit(0)
@@ -75,7 +79,7 @@ func main() {
 
 	defer Shutdown()
 	// init grid, cursor, header
-	cursor = NewGridCursor()
+	cursor = NewGridCursor(*connectorFlag)
 	cGrid = compact.NewCompactGrid()
 	header = widgets.NewCTopHeader()
 
@@ -104,6 +108,18 @@ func Shutdown() {
 	}
 }
 
+func validConnector(s string) {
+	if _, ok := enabledConnectors[s]; !ok {
+		fmt.Printf("invalid connector type: %s", s)
+		var connectors []string
+		for k, _ := range enabledConnectors {
+			connectors = append(connectors, k)
+		}
+		fmt.Printf("connector must be one of: %s", strings.Join(connectors, ","))
+		os.Exit(1)
+	}
+}
+
 // ensure a given sort field is valid
 func validSort(s string) {
 	if _, ok := container.Sorters[s]; !ok {