make sure printers are properly flushed

src/compiler/cpp_generator.cc

@@ -86,6 +86,8 @@ grpc::string FilenameIdentifier(const grpc::string &filename) {
 grpc::string GetHeaderPrologue(const grpc::protobuf::FileDescriptor *file,
                                const Parameters &params) {
   grpc::string output;
+  {
+    // Scope the output stream so it closes and finalizes output to the string.
     grpc::protobuf::io::StringOutputStream output_stream(&output);
     grpc::protobuf::io::Printer printer(&output_stream, '$');
     std::map<grpc::string, grpc::string> vars;
@@ -102,7 +104,7 @@ grpc::string GetHeaderPrologue(const grpc::protobuf::FileDescriptor *file,
     printer.Print(vars, "\n");
     printer.Print(vars, "#include \"$filename_base$.pb.h\"\n");
     printer.Print(vars, "\n");
-
+  }
   return output;
 }
 
@@ -626,6 +628,8 @@ void PrintHeaderService(grpc::protobuf::io::Printer *printer,
 grpc::string GetHeaderServices(const grpc::protobuf::FileDescriptor *file,
                                const Parameters &params) {
   grpc::string output;
+  {
+	// Scope the output stream so it closes and finalizes output to the string.
     grpc::protobuf::io::StringOutputStream output_stream(&output);
     grpc::protobuf::io::Printer printer(&output_stream, '$');
     std::map<grpc::string, grpc::string> vars;
@@ -643,13 +647,15 @@ grpc::string GetHeaderServices(const grpc::protobuf::FileDescriptor *file,
     if (!params.services_namespace.empty()) {
       printer.Print(vars, "}  // namespace $services_namespace$\n\n");
     }
-
+  }
   return output;
 }
 
 grpc::string GetHeaderEpilogue(const grpc::protobuf::FileDescriptor *file,
                                const Parameters &params) {
   grpc::string output;
+  {
+    // Scope the output stream so it closes and finalizes output to the string.
     grpc::protobuf::io::StringOutputStream output_stream(&output);
     grpc::protobuf::io::Printer printer(&output_stream, '$');
     std::map<grpc::string, grpc::string> vars;
@@ -670,13 +676,15 @@ grpc::string GetHeaderEpilogue(const grpc::protobuf::FileDescriptor *file,
 
     printer.Print(vars, "\n");
     printer.Print(vars, "#endif  // GRPC_$filename_identifier$__INCLUDED\n");
-
+  }
   return output;
 }
 
 grpc::string GetSourcePrologue(const grpc::protobuf::FileDescriptor *file,
                                const Parameters &params) {
   grpc::string output;
+  {
+    // Scope the output stream so it closes and finalizes output to the string.
     grpc::protobuf::io::StringOutputStream output_stream(&output);
     grpc::protobuf::io::Printer printer(&output_stream, '$');
     std::map<grpc::string, grpc::string> vars;
@@ -690,13 +698,15 @@ grpc::string GetSourcePrologue(const grpc::protobuf::FileDescriptor *file,
     printer.Print(vars, "#include \"$filename_base$.pb.h\"\n");
     printer.Print(vars, "#include \"$filename_base$.grpc.pb.h\"\n");
     printer.Print(vars, "\n");
-
+  }
   return output;
 }
 
 grpc::string GetSourceIncludes(const grpc::protobuf::FileDescriptor *file,
                                const Parameters &param) {
   grpc::string output;
+  {
+    // Scope the output stream so it closes and finalizes output to the string.
     grpc::protobuf::io::StringOutputStream output_stream(&output);
     grpc::protobuf::io::Printer printer(&output_stream, '$');
     std::map<grpc::string, grpc::string> vars;
@@ -719,7 +729,7 @@ grpc::string GetSourceIncludes(const grpc::protobuf::FileDescriptor *file,
     }
 
     printer.Print(vars, "\n");
-
+  }
   return output;
 }
 
@@ -1077,6 +1087,8 @@ void PrintSourceService(grpc::protobuf::io::Printer *printer,
 grpc::string GetSourceServices(const grpc::protobuf::FileDescriptor *file,
                                const Parameters &params) {
   grpc::string output;
+  {
+    // Scope the output stream so it closes and finalizes output to the string.
     grpc::protobuf::io::StringOutputStream output_stream(&output);
     grpc::protobuf::io::Printer printer(&output_stream, '$');
     std::map<grpc::string, grpc::string> vars;
@@ -1098,6 +1110,7 @@ grpc::string GetSourceServices(const grpc::protobuf::FileDescriptor *file,
       PrintSourceService(&printer, file->service(i), &vars);
       printer.Print("\n");
     }
+  }
   return output;
 }
 

src/compiler/csharp_generator.cc

@@ -474,6 +474,9 @@ void GenerateService(Printer* out, const ServiceDescriptor *service) {
 
 grpc::string GetServices(const FileDescriptor *file) {
   grpc::string output;
+  {
+    // Scope the output stream so it closes and finalizes output to the string.
+
     StringOutputStream output_stream(&output);
     Printer out(&output_stream, '$');
 
@@ -503,6 +506,7 @@ grpc::string GetServices(const FileDescriptor *file) {
     out.Outdent();
     out.Print("}\n");
     out.Print("#endregion\n");
+  }
   return output;
 }
 

src/compiler/objective_c_generator.cc

@@ -176,6 +176,8 @@ void PrintMethodImplementations(Printer *printer,
 
 string GetHeader(const ServiceDescriptor *service, const string prefix) {
   string output;
+  {
+    // Scope the output stream so it closes and finalizes output to the string.
     grpc::protobuf::io::StringOutputStream output_stream(&output);
     Printer printer(&output_stream, '$');
   
@@ -198,11 +200,14 @@ string GetHeader(const ServiceDescriptor *service, const string prefix) {
     printer.Print("- (instancetype)initWithHost:(NSString *)host"
       " NS_DESIGNATED_INITIALIZER;\n");
     printer.Print("@end\n");
+  }
   return output;
 }
 
 string GetSource(const ServiceDescriptor *service, const string prefix) {
   string output;
+  {
+    // Scope the output stream so it closes and finalizes output to the string.
     grpc::protobuf::io::StringOutputStream output_stream(&output);
     Printer printer(&output_stream, '$');
 
@@ -235,6 +240,7 @@ string GetSource(const ServiceDescriptor *service, const string prefix) {
     }
 
     printer.Print("@end\n");
+  }
   return output;
 }
 

src/compiler/ruby_generator.cc

@@ -119,6 +119,9 @@ void PrintService(const ServiceDescriptor *service, const grpc::string &package,
 
 grpc::string GetServices(const FileDescriptor *file) {
   grpc::string output;
+  {
+    // Scope the output stream so it closes and finalizes output to the string.
+
     StringOutputStream output_stream(&output);
     Printer out(&output_stream, '$');
 
@@ -161,7 +164,7 @@ grpc::string GetServices(const FileDescriptor *file) {
       out.Outdent();
       out.Print("end\n");
     }
-
+  }
   return output;
 }