runtime: add new command to collect metrics from Kata containers

Add a new command to collect metrics and return metrics to Prometheus.

Signed-off-by: bin liu <bin@hyper.sh>

src/runtime/pkg/utils/metrics.go

@@ -1,3 +1,8 @@
+// Copyright (c) 2020 Ant Financial
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
 package utils
 
 import (

src/runtime/pkg/utils/utils.go

@@ -1,10 +1,12 @@
+// Copyright (c) 2020 Ant Financial
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
 package utils
 
 import (
-	"fmt"
 	"net/http"
-	"os"
-	"path/filepath"
 	"strings"
 )
 
@@ -29,14 +31,3 @@ func GzipAccepted(header http.Header) bool {
 func String2Pointer(s string) *string {
 	return &s
 }
-
-// EnsureFileDir will check if file a in an absolute format and ensure the directory is exits
-// if not, make the dir like `mkdir -p`
-func EnsureFileDir(file string) error {
-	if !filepath.IsAbs(file) {
-		return fmt.Errorf("file must be an absolute path")
-	}
-
-	path := filepath.Dir(file)
-	return os.MkdirAll(path, 0755)
-}

src/runtime/pkg/utils/utils_test.go

@@ -1,8 +1,12 @@
+// Copyright (c) 2020 Ant Financial
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
 package utils
 
 import (
 	"net/http"
-	"os"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
@@ -41,45 +45,3 @@ func TestGzipAccepted(t *testing.T) {
 		assert.Equal(tc.result, b)
 	}
 }
-
-func TestEnsureFileDir(t *testing.T) {
-	assert := assert.New(t)
-	testCases := []struct {
-		file string
-		path string
-		err  bool
-	}{
-		{
-			file: "abc.txt",
-			path: "",
-			err:  true,
-		},
-		{
-			file: "/tmp/kata-test/abc/def/igh.txt",
-			path: "/tmp/kata-test/abc/def",
-			err:  false,
-		},
-		{
-			file: "/tmp/kata-test/abc/../def/igh.txt",
-			path: "/tmp/kata-test/def",
-			err:  false,
-		},
-	}
-
-	for i := range testCases {
-		tc := testCases[i]
-		err := EnsureFileDir(tc.file)
-		// assert error
-		assert.Equal(tc.err, err != nil)
-
-		if !tc.err {
-			// assert directory created
-			fileInfo, err := os.Stat(tc.path)
-			assert.Equal(nil, err)
-			assert.Equal(true, fileInfo.IsDir())
-		}
-	}
-
-	// clear test directory
-	os.RemoveAll("/tmp/kata-test")
-}