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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,215 @@ | ||
| package service | ||
|
|
||
| import ( | ||
| "path/filepath" | ||
|
|
||
| "goa.design/goa/v3/codegen" | ||
| "goa.design/goa/v3/expr" | ||
| ) | ||
|
|
||
| type ( | ||
| // ServiceInterceptorData contains all data needed for generating interceptor code | ||
| ServiceInterceptorData struct { | ||
| Service string | ||
| PkgName string | ||
| Methods []*MethodInterceptorData | ||
| ServerInterceptors []*InterceptorData | ||
| ClientInterceptors []*InterceptorData | ||
| AllInterceptors []*InterceptorData | ||
| HasPrivateImplementationTypes bool | ||
| } | ||
|
|
||
| // MethodInterceptorData contains interceptor data for a single method | ||
| MethodInterceptorData struct { | ||
| Service string | ||
| Method string | ||
| MethodVarName string | ||
| PayloadRef string | ||
| ResultRef string | ||
| ServerInterceptors []*InterceptorData | ||
| ClientInterceptors []*InterceptorData | ||
| } | ||
|
|
||
| // InterceptorData describes a single interceptor. | ||
| InterceptorData struct { | ||
| Name string | ||
| UnexportedName string | ||
| Description string | ||
| PayloadRef string | ||
| ResultRef string | ||
| ReadPayload []*AttributeData | ||
| WritePayload []*AttributeData | ||
| ReadResult []*AttributeData | ||
| WriteResult []*AttributeData | ||
| ServerStreamInputStruct string | ||
| ClientStreamInputStruct string | ||
| } | ||
|
|
||
| // AttributeData describes a single attribute. | ||
| AttributeData struct { | ||
| Name string | ||
| TypeRef string | ||
| FieldPointer bool | ||
| } | ||
| ) | ||
|
|
||
| // InterceptorsFile returns the interceptors file for the given service. | ||
| func InterceptorsFile(genpkg string, service *expr.ServiceExpr) *codegen.File { | ||
| svc := Services.Get(service.Name) | ||
| data := interceptorsData(service) | ||
| if len(data.ServerInterceptors) == 0 && len(data.ClientInterceptors) == 0 { | ||
| return nil | ||
| } | ||
|
|
||
| path := filepath.Join(codegen.Gendir, svc.PathName, "interceptors.go") | ||
| sections := []*codegen.SectionTemplate{ | ||
| codegen.Header(service.Name+" interceptors", svc.PkgName, []*codegen.ImportSpec{ | ||
| {Path: "context"}, | ||
| codegen.GoaImport(""), | ||
| }), | ||
| { | ||
| Name: "interceptors", | ||
| Source: readTemplate("interceptors"), | ||
| Data: data, | ||
| }, | ||
| } | ||
|
|
||
| return &codegen.File{Path: path, SectionTemplates: sections} | ||
| } | ||
|
|
||
| func interceptorsData(service *expr.ServiceExpr) *ServiceInterceptorData { | ||
| svc := Services.Get(service.Name) | ||
| scope := svc.Scope | ||
|
|
||
| // Build method data first | ||
| methods := make([]*MethodInterceptorData, 0, len(service.Methods)) | ||
| seenInts := make(map[string]*InterceptorData) | ||
| var serviceServerInts, serviceClientInts, allInts []*InterceptorData | ||
| var hasTypes bool | ||
|
|
||
| for _, m := range service.Methods { | ||
| methodServerInts, methodClientInts := buildMethodInterceptors(m, scope) | ||
| if len(methodServerInts) == 0 && len(methodClientInts) == 0 { | ||
| continue | ||
| } | ||
| hasTypes = hasTypes || hasPrivateImplementationTypes(methodServerInts) || hasPrivateImplementationTypes(methodClientInts) | ||
|
|
||
| // Add method data | ||
| methods = append(methods, &MethodInterceptorData{ | ||
| Service: svc.Name, | ||
| Method: m.Name, | ||
| MethodVarName: codegen.Goify(m.Name, true), | ||
| PayloadRef: scope.GoFullTypeRef(m.Payload, ""), | ||
| ResultRef: scope.GoFullTypeRef(m.Result, ""), | ||
| ServerInterceptors: methodServerInts, | ||
| ClientInterceptors: methodClientInts, | ||
| }) | ||
|
|
||
| // Collect unique interceptors | ||
| for _, i := range methodServerInts { | ||
| if _, ok := seenInts[i.Name]; !ok { | ||
| seenInts[i.Name] = i | ||
| serviceServerInts = append(serviceServerInts, i) | ||
| allInts = append(allInts, i) | ||
| } | ||
| } | ||
| for _, i := range methodClientInts { | ||
| if _, ok := seenInts[i.Name]; !ok { | ||
| seenInts[i.Name] = i | ||
| serviceClientInts = append(serviceClientInts, i) | ||
| allInts = append(allInts, i) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return &ServiceInterceptorData{ | ||
| Service: service.Name, | ||
| PkgName: svc.PkgName, | ||
| Methods: methods, | ||
| ServerInterceptors: serviceServerInts, | ||
| ClientInterceptors: serviceClientInts, | ||
| AllInterceptors: allInts, | ||
| HasPrivateImplementationTypes: hasTypes, | ||
| } | ||
| } | ||
|
|
||
| func buildMethodInterceptors(m *expr.MethodExpr, scope *codegen.NameScope) ([]*InterceptorData, []*InterceptorData) { | ||
| svc := Services.Get(m.Service.Name) | ||
| methodData := svc.Method(m.Name) | ||
| var serverEndpointStruct, clientEndpointStruct string | ||
| if methodData.ServerStream != nil { | ||
| serverEndpointStruct = methodData.ServerStream.EndpointStruct | ||
| } | ||
| if methodData.ClientStream != nil { | ||
| clientEndpointStruct = methodData.ClientStream.EndpointStruct | ||
| } | ||
| var hasPrivateImplementationTypes bool | ||
| buildInterceptor := func(intr *expr.InterceptorExpr) *InterceptorData { | ||
| hasPrivateImplementationTypes = hasPrivateImplementationTypes || | ||
| intr.ReadPayload != nil || intr.WritePayload != nil || intr.ReadResult != nil || intr.WriteResult != nil | ||
|
|
||
| return &InterceptorData{ | ||
| Name: codegen.Goify(intr.Name, true), | ||
| UnexportedName: codegen.Goify(intr.Name, false), | ||
| Description: intr.Description, | ||
| PayloadRef: methodData.PayloadRef, | ||
| ResultRef: methodData.ResultRef, | ||
| ServerStreamInputStruct: serverEndpointStruct, | ||
| ClientStreamInputStruct: clientEndpointStruct, | ||
| ReadPayload: collectAttributes(intr.ReadPayload, m.Payload, scope), | ||
| WritePayload: collectAttributes(intr.WritePayload, m.Payload, scope), | ||
| ReadResult: collectAttributes(intr.ReadResult, m.Result, scope), | ||
| WriteResult: collectAttributes(intr.WriteResult, m.Result, scope), | ||
| } | ||
| } | ||
|
|
||
| serverInts := make([]*InterceptorData, len(m.ServerInterceptors)) | ||
| for i, intr := range m.ServerInterceptors { | ||
| serverInts[i] = buildInterceptor(intr) | ||
| } | ||
|
|
||
| clientInts := make([]*InterceptorData, len(m.ClientInterceptors)) | ||
| for i, intr := range m.ClientInterceptors { | ||
| clientInts[i] = buildInterceptor(intr) | ||
| } | ||
|
|
||
| return serverInts, clientInts | ||
| } | ||
|
|
||
| // hasPrivateImplementationTypes returns true if any of the interceptors have | ||
| // private implementation types. | ||
| func hasPrivateImplementationTypes(interceptors []*InterceptorData) bool { | ||
| for _, intr := range interceptors { | ||
| if intr.ReadPayload != nil || intr.WritePayload != nil || intr.ReadResult != nil || intr.WriteResult != nil { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| // collectAttributes builds AttributeData from an AttributeExpr | ||
| func collectAttributes(attrNames, parent *expr.AttributeExpr, scope *codegen.NameScope) []*AttributeData { | ||
| if attrNames == nil { | ||
| return nil | ||
| } | ||
|
|
||
| obj := expr.AsObject(attrNames.Type) | ||
| if obj == nil { | ||
| return nil | ||
| } | ||
|
|
||
| data := make([]*AttributeData, len(*obj)) | ||
| for i, nat := range *obj { | ||
| parentAttr := parent.Find(nat.Name) | ||
| if parentAttr == nil { | ||
| continue | ||
| } | ||
|
|
||
| data[i] = &AttributeData{ | ||
| Name: codegen.Goify(nat.Name, true), | ||
| TypeRef: scope.GoTypeRef(parentAttr), | ||
| FieldPointer: parent.IsPrimitivePointer(nat.Name, true), | ||
| } | ||
| } | ||
| return data | ||
| } |
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