Import of https://github.com/ciena/voltctl at commit 40d61fbf3f910ed4017cf67c9c79e8e1f82a33a5
Change-Id: I8464c59e60d76cb8612891db3303878975b5416c
diff --git a/vendor/google.golang.org/appengine/internal/metadata.go b/vendor/google.golang.org/appengine/internal/metadata.go
new file mode 100644
index 0000000..c4ba63b
--- /dev/null
+++ b/vendor/google.golang.org/appengine/internal/metadata.go
@@ -0,0 +1,60 @@
+// Copyright 2014 Google Inc. All rights reserved.
+// Use of this source code is governed by the Apache 2.0
+// license that can be found in the LICENSE file.
+
+package internal
+
+// This file has code for accessing metadata.
+//
+// References:
+// https://cloud.google.com/compute/docs/metadata
+
+import (
+ "fmt"
+ "io/ioutil"
+ "net/http"
+ "net/url"
+)
+
+const (
+ metadataHost = "metadata"
+ metadataPath = "/computeMetadata/v1/"
+)
+
+var (
+ metadataRequestHeaders = http.Header{
+ "Metadata-Flavor": []string{"Google"},
+ }
+)
+
+// TODO(dsymonds): Do we need to support default values, like Python?
+func mustGetMetadata(key string) []byte {
+ b, err := getMetadata(key)
+ if err != nil {
+ panic(fmt.Sprintf("Metadata fetch failed for '%s': %v", key, err))
+ }
+ return b
+}
+
+func getMetadata(key string) ([]byte, error) {
+ // TODO(dsymonds): May need to use url.Parse to support keys with query args.
+ req := &http.Request{
+ Method: "GET",
+ URL: &url.URL{
+ Scheme: "http",
+ Host: metadataHost,
+ Path: metadataPath + key,
+ },
+ Header: metadataRequestHeaders,
+ Host: metadataHost,
+ }
+ resp, err := http.DefaultClient.Do(req)
+ if err != nil {
+ return nil, err
+ }
+ defer resp.Body.Close()
+ if resp.StatusCode != 200 {
+ return nil, fmt.Errorf("metadata server returned HTTP %d", resp.StatusCode)
+ }
+ return ioutil.ReadAll(resp.Body)
+}