runtime: add implementation of GetMetrics

add implementation of `GetMetrics` for runtime.

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

src/runtime/pkg/utils/utils.go

@@ -0,0 +1,42 @@
+package utils
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const (
+	acceptEncodingHeader = "Accept-Encoding"
+)
+
+// GzipAccepted returns whether the client will accept gzip-encoded content.
+func GzipAccepted(header http.Header) bool {
+	a := header.Get(acceptEncodingHeader)
+	parts := strings.Split(a, ",")
+	for _, part := range parts {
+		part = strings.TrimSpace(part)
+		if part == "gzip" || strings.HasPrefix(part, "gzip;") {
+			return true
+		}
+	}
+	return false
+}
+
+// String2Pointer make a string to a pointer to string
+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)
+}