HTTP server API changes for improved extensibility (#684)

* refactored `HttpServer` so all subclass member functions are proctected, to make it easier to extend base functionality
* added API service, can be used to enumerate registered endpoints (at `/api`). Currently only very basic information is provided

1 files changed, 47 insertions, 0 deletions

diff --git a/src/zenhttp/monitoring/httpapiservice.cpp b/src/zenhttp/monitoring/httpapiservice.cpp
new file mode 100644
index 000000000..f8cfa25f4
--- /dev/null
+++ b/src/zenhttp/monitoring/httpapiservice.cpp
@@ -0,0 +1,47 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include <zenhttp/httpapiservice.h>
+
+#include <zencore/compactbinarybuilder.h>
+
+namespace zen {
+
+HttpApiService::HttpApiService(HttpServer& Server) : m_Server(Server)
+{
+	m_Router.RegisterRoute(
+		"",
+		[&](HttpRouterRequest& Request) {
+			CbObjectWriter ResponseData;
+
+			ResponseData.BeginArray("services");
+
+			m_Server.EnumerateServices([&](HttpService& Service) {
+				ResponseData.BeginObject();
+				ResponseData << "base_uri" << Service.BaseUri();
+				ResponseData.EndObject();
+			});
+
+			ResponseData.EndArray();
+
+			Request.ServerRequest().WriteResponse(HttpResponseCode::OK, ResponseData.Save());
+		},
+		HttpVerb::kGet);
+}
+
+HttpApiService::~HttpApiService()
+{
+}
+
+const char*
+HttpApiService::BaseUri() const
+{
+	return "/api/";
+}
+
+void
+HttpApiService::HandleRequest(HttpServerRequest& HttpServiceRequest)
+{
+	m_Router.HandleRequest(HttpServiceRequest);
+}
+
+}  // namespace zen