| // Copyright 2016 The LUCI 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 svcmux contains utility functions used by code generated by |
| // svcmux tool. |
| // It is not designed to be used directly. |
| package svcmux |
| |
| import ( |
| "context" |
| |
| "google.golang.org/grpc/codes" |
| "google.golang.org/grpc/metadata" |
| "google.golang.org/grpc/status" |
| ) |
| |
| // VersionMetadataKey is key in gRPC metadata that specifies requested |
| // service version. |
| const VersionMetadataKey = "X-Luci-Service-Version" |
| |
| // GetServiceVersion extracts requested service version from metadata in c. |
| func GetServiceVersion(c context.Context, defaultVer string) string { |
| if md, ok := metadata.FromIncomingContext(c); ok { |
| values := md[VersionMetadataKey] |
| if len(values) != 0 { |
| return values[0] |
| } |
| } |
| return defaultVer |
| } |
| |
| // NoImplementation creates an error for a service version that does not have an |
| // implementation. |
| func NoImplementation(version string) error { |
| return status.Errorf(codes.Unimplemented, "version %s not implemented", version) |
| } |