feat: add interceptors for grpc

hrp/internal/data/data.go

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2020 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package data provides convenience routines to access files in the data
+// directory.
+package data
+
+import (
+	"path/filepath"
+	"runtime"
+)
+
+// basepath is the root directory of this package.
+var basepath string
+
+func init() {
+	_, currentFile, _, _ := runtime.Caller(0)
+	basepath = filepath.Dir(currentFile)
+}
+
+// Path returns the absolute path the given relative file or directory path,
+// relative to the google.golang.org/grpc/examples/data directory in the
+// user's GOPATH.  If rel is already absolute, it is returned unmodified.
+func Path(rel string) string {
+	if filepath.IsAbs(rel) {
+		return rel
+	}
+
+	return filepath.Join(basepath, rel)
+}