grpc: Add StaticMethod CallOption

rpc_util.go

@@ -189,6 +189,20 @@
 func (EmptyCallOption) before(*callInfo) error      { return nil }
 func (EmptyCallOption) after(*callInfo, *csAttempt) {}
 
+// RegisteredMethod returns a CallOption which specifies that a call comes from
+// a registered method. This does nothing functionally, but serves as a signal
+// to other code.
+func RegisteredMethod() CallOption {
+	return RegisteredMethodCallOption{}
+}
+
+// RegisteredMethodCallOption is a CallOption that specifies that a call comes
+// from a registered method.
+type RegisteredMethodCallOption struct{}
+
+func (RegisteredMethodCallOption) before(*callInfo) error      { return nil }
+func (RegisteredMethodCallOption) after(*callInfo, *csAttempt) {}
+
 // Header returns a CallOptions that retrieves the header metadata
 // for a unary RPC.
 func Header(md *metadata.MD) CallOption {
@@ -958,6 +972,7 @@
 	SupportPackageIsVersion5 = true
 	SupportPackageIsVersion6 = true
 	SupportPackageIsVersion7 = true
+	SupportPackageIsVersion8 = true
 )
 
 const grpcUA = "grpc-go/" + Version