Import of https://github.com/ciena/voltctl at commit 40d61fbf3f910ed4017cf67c9c79e8e1f82a33a5
Change-Id: I8464c59e60d76cb8612891db3303878975b5416c
diff --git a/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go b/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go
new file mode 100644
index 0000000..11be7cd
--- /dev/null
+++ b/vendor/google.golang.org/grpc/internal/envconfig/envconfig.go
@@ -0,0 +1,64 @@
+/*
+ *
+ * Copyright 2018 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 envconfig contains grpc settings configured by environment variables.
+package envconfig
+
+import (
+ "os"
+ "strings"
+)
+
+const (
+ prefix = "GRPC_GO_"
+ retryStr = prefix + "RETRY"
+ requireHandshakeStr = prefix + "REQUIRE_HANDSHAKE"
+)
+
+// RequireHandshakeSetting describes the settings for handshaking.
+type RequireHandshakeSetting int
+
+const (
+ // RequireHandshakeOn indicates to wait for handshake before considering a
+ // connection ready/successful.
+ RequireHandshakeOn RequireHandshakeSetting = iota
+ // RequireHandshakeOff indicates to not wait for handshake before
+ // considering a connection ready/successful.
+ RequireHandshakeOff
+)
+
+var (
+ // Retry is set if retry is explicitly enabled via "GRPC_GO_RETRY=on".
+ Retry = strings.EqualFold(os.Getenv(retryStr), "on")
+ // RequireHandshake is set based upon the GRPC_GO_REQUIRE_HANDSHAKE
+ // environment variable.
+ //
+ // Will be removed after the 1.18 release.
+ RequireHandshake = RequireHandshakeOn
+)
+
+func init() {
+ switch strings.ToLower(os.Getenv(requireHandshakeStr)) {
+ case "on":
+ fallthrough
+ default:
+ RequireHandshake = RequireHandshakeOn
+ case "off":
+ RequireHandshake = RequireHandshakeOff
+ }
+}