Use Kubernetes Client instead of Controller APIs from CLI (#2605)

Use the Kubernetes and Fission Client from CLI instead of Controller API.
This removes port-forwarding for the controller across Fission CLI mostly.

* Use configurable client in CLI
* Move resource namespace under cmd client
* use server to get fission version
* get archive with URL

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>
Co-authored-by: Sanket Sudake <sanketsudake@gmail.com>

pkg/fission-cli/cmd/cmd.go

@@ -17,10 +17,12 @@ limitations under the License.
 package cmd
 
 import (
+	"os"
 	"sync"
 
-	"github.com/fission/fission/pkg/controller/client"
 	"github.com/fission/fission/pkg/fission-cli/cliwrapper/cli"
+	"github.com/fission/fission/pkg/fission-cli/console"
+	flagkey "github.com/fission/fission/pkg/fission-cli/flag/key"
 )
 
 type (
@@ -29,16 +31,40 @@ type (
 )
 
 var (
-	once             = sync.Once{}
-	defaultClientset client.Interface
+	once          = sync.Once{}
+	defaultClient Client
 )
 
-func SetClientset(clientset client.Interface) {
+func SetClientset(client Client) {
 	once.Do(func() {
-		defaultClientset = clientset
+		defaultClient = client
 	})
 }
 
-func (c *CommandActioner) Client() client.Interface {
-	return defaultClientset
+func (c *CommandActioner) Client() Client {
+	return defaultClient
+}
+
+func (c *CommandActioner) GetResourceNamespace(input cli.Input, deprecatedFlag string) (namespace, currentNS string, err error) {
+	namespace = input.String(deprecatedFlag)
+	currentNS = namespace
+
+	if input.String(flagkey.Namespace) != "" {
+		namespace = input.String(flagkey.Namespace)
+		currentNS = namespace
+		console.Verbose(2, "Namespace for resource %s ", currentNS)
+		return namespace, currentNS, err
+	}
+
+	if namespace == "" {
+		if os.Getenv("FISSION_DEFAULT_NAMESPACE") != "" {
+			currentNS = os.Getenv("FISSION_DEFAULT_NAMESPACE")
+		} else {
+			currentNS = c.Client().Namespace
+			return namespace, currentNS, err
+		}
+	}
+
+	console.Verbose(2, "Namespace for resource %s ", currentNS)
+	return namespace, currentNS, nil
 }