runtime: add implementation of GetMetrics

add implementation of `GetMetrics` for runtime.

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

src/runtime/pkg/utils/utils_test.go

@@ -0,0 +1,85 @@
+package utils
+
+import (
+	"net/http"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGzipAccepted(t *testing.T) {
+	assert := assert.New(t)
+	testCases := []struct {
+		header string
+		result bool
+	}{
+		{
+			header: "",
+			result: false,
+		},
+		{
+			header: "abc",
+			result: false,
+		},
+		{
+			header: "gzip",
+			result: true,
+		},
+		{
+			header: "deflate, gzip;q=1.0, *;q=0.5",
+			result: true,
+		},
+	}
+
+	h := http.Header{}
+
+	for i := range testCases {
+		tc := testCases[i]
+		h[acceptEncodingHeader] = []string{tc.header}
+		b := GzipAccepted(h)
+		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")
+}