chore: add ability to skip generating sdks

internal/cmd/protoc-gen-go-flipt-sdk/grpc.go

@@ -36,6 +36,14 @@ func generateGRPC(gen *protogen.Plugin) {
 		)
 
 		if len(file.Services) < 2 {
+			srv := file.Services[0]
+			if srv.Comments.Leading != "" {
+				leading := strings.TrimPrefix(string(srv.Comments.Leading), "//")
+				if strings.TrimSpace(leading) == ignoreDecl {
+					continue
+				}
+			}
+
 			returnType := file.Services[0].GoName + "Client"
 			g.P("func (t Transport) ", method, "() ", relativeImport(g, file, returnType), "{")
 			g.P("return ", relativeImport(g, file, "New"+returnType), "(t.cc)")
@@ -52,6 +60,13 @@ func generateGRPC(gen *protogen.Plugin) {
 		g.P("}\n")
 
 		for _, srv := range file.Services {
+			if srv.Comments.Leading != "" {
+				leading := strings.TrimPrefix(string(srv.Comments.Leading), "//")
+				if strings.TrimSpace(leading) == ignoreDecl {
+					continue
+				}
+			}
+
 			returnType := srv.GoName + "Client"
 			g.P("func (t ", groupType, ") ", returnType, "() ", relativeImport(g, file, returnType), " {")
 			g.P("return ", relativeImport(g, file, "New"+returnType), "(t.cc)")

internal/cmd/protoc-gen-go-flipt-sdk/http.go

@@ -141,6 +141,13 @@ func generateHTTP(gen *protogen.Plugin, grpcAPIConfig string) {
 
 		if len(file.Services) < 2 {
 			srv := file.Services[0]
+			if srv.Comments.Leading != "" {
+				leading := strings.TrimPrefix(string(srv.Comments.Leading), "//")
+				if strings.TrimSpace(leading) == ignoreDecl {
+					continue
+				}
+			}
+
 			returnType := srv.GoName + "Client"
 
 			g.P("type ", returnType, " struct {")
@@ -168,6 +175,13 @@ func generateHTTP(gen *protogen.Plugin, grpcAPIConfig string) {
 		g.P("}\n")
 
 		for _, srv := range file.Services {
+			if srv.Comments.Leading != "" {
+				leading := strings.TrimPrefix(string(srv.Comments.Leading), "//")
+				if strings.TrimSpace(leading) == ignoreDecl {
+					continue
+				}
+			}
+
 			var (
 				returnType           = srv.GoName + "Client"
 				unexportedReturnType = unexport(returnType)

internal/cmd/protoc-gen-go-flipt-sdk/main.go

@@ -13,6 +13,8 @@ import (
 const (
 	importPath  = "go.flipt.io/flipt/sdk/go"
 	emptyImport = "google.golang.org/protobuf/types/known/emptypb"
+
+	ignoreDecl = "flipt:sdk:ignore"
 )
 
 func main() {
@@ -30,6 +32,7 @@ func main() {
 		// warning.
 		gen.SupportedFeatures |= uint64(pluginpb.CodeGeneratorResponse_FEATURE_PROTO3_OPTIONAL)
 		for _, f := range gen.Files {
+
 			if !f.Generate {
 				continue
 			}
@@ -129,6 +132,13 @@ func generateSubSDK(gen *protogen.Plugin, file *protogen.File) (typ, client stri
 	}
 
 	for _, srv := range file.Services {
+		if srv.Comments.Leading != "" {
+			leading := strings.TrimPrefix(string(srv.Comments.Leading), "//")
+			if strings.TrimSpace(leading) == ignoreDecl {
+				continue
+			}
+		}
+
 		serviceName := srv.GoName
 		if oneServicePackage {
 			serviceName = typ

rpc/flipt/evaluation/evaluation.proto

@@ -162,6 +162,7 @@ message EvaluationNamespaceSnapshotRequest {
   string key = 1;
 }
 
+// flipt:sdk:ignore
 service DataService {
   rpc EvaluationSnapshotNamespace(EvaluationNamespaceSnapshotRequest) returns (EvaluationNamespaceSnapshot);
 }