Matteo Scandolo | a6a3aee | 2019-11-26 13:30:14 -0700 | [diff] [blame] | 1 | package descriptor |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "fmt" |
| 6 | "io/ioutil" |
| 7 | "strings" |
| 8 | |
| 9 | "github.com/ghodss/yaml" |
| 10 | "github.com/golang/protobuf/jsonpb" |
| 11 | ) |
| 12 | |
| 13 | func loadGrpcAPIServiceFromYAML(yamlFileContents []byte, yamlSourceLogName string) (*GrpcAPIService, error) { |
| 14 | jsonContents, err := yaml.YAMLToJSON(yamlFileContents) |
| 15 | if err != nil { |
| 16 | return nil, fmt.Errorf("Failed to convert gRPC API Configuration from YAML in '%v' to JSON: %v", yamlSourceLogName, err) |
| 17 | } |
| 18 | |
| 19 | // As our GrpcAPIService is incomplete accept unkown fields. |
| 20 | unmarshaler := jsonpb.Unmarshaler{ |
| 21 | AllowUnknownFields: true, |
| 22 | } |
| 23 | |
| 24 | serviceConfiguration := GrpcAPIService{} |
| 25 | if err := unmarshaler.Unmarshal(bytes.NewReader(jsonContents), &serviceConfiguration); err != nil { |
| 26 | return nil, fmt.Errorf("Failed to parse gRPC API Configuration from YAML in '%v': %v", yamlSourceLogName, err) |
| 27 | } |
| 28 | |
| 29 | return &serviceConfiguration, nil |
| 30 | } |
| 31 | |
| 32 | func registerHTTPRulesFromGrpcAPIService(registry *Registry, service *GrpcAPIService, sourceLogName string) error { |
| 33 | if service.HTTP == nil { |
| 34 | // Nothing to do |
| 35 | return nil |
| 36 | } |
| 37 | |
| 38 | for _, rule := range service.HTTP.GetRules() { |
| 39 | selector := "." + strings.Trim(rule.GetSelector(), " ") |
| 40 | if strings.ContainsAny(selector, "*, ") { |
| 41 | return fmt.Errorf("Selector '%v' in %v must specify a single service method without wildcards", rule.GetSelector(), sourceLogName) |
| 42 | } |
| 43 | |
| 44 | registry.AddExternalHTTPRule(selector, rule) |
| 45 | } |
| 46 | |
| 47 | return nil |
| 48 | } |
| 49 | |
| 50 | // LoadGrpcAPIServiceFromYAML loads a gRPC API Configuration from the given YAML file |
| 51 | // and registers the HttpRule descriptions contained in it as externalHTTPRules in |
| 52 | // the given registry. This must be done before loading the proto file. |
| 53 | // |
| 54 | // You can learn more about gRPC API Service descriptions from google's documentation |
| 55 | // at https://cloud.google.com/endpoints/docs/grpc/grpc-service-config |
| 56 | // |
| 57 | // Note that for the purposes of the gateway generator we only consider a subset of all |
| 58 | // available features google supports in their service descriptions. |
| 59 | func (r *Registry) LoadGrpcAPIServiceFromYAML(yamlFile string) error { |
| 60 | yamlFileContents, err := ioutil.ReadFile(yamlFile) |
| 61 | if err != nil { |
| 62 | return fmt.Errorf("Failed to read gRPC API Configuration description from '%v': %v", yamlFile, err) |
| 63 | } |
| 64 | |
| 65 | service, err := loadGrpcAPIServiceFromYAML(yamlFileContents, yamlFile) |
| 66 | if err != nil { |
| 67 | return err |
| 68 | } |
| 69 | |
| 70 | return registerHTTPRulesFromGrpcAPIService(r, service, yamlFile) |
| 71 | } |