stats: Implemented new stats endpoint

Stats are exposed under /stats/{id}, so for example structured cache stats are exposed under /stats/z$

The separate endpoint makes it easier to separate request handling to ensure stats/status endpoints still respond if the regular request queue is somehow saturated or otherwise not behaving

There is also a /status endpoint which is similar and is targeted towards lightweight health monitoring

1 files changed, 18 insertions, 1 deletions

diff --git a/zenserver/monitoring/httpstats.cpp b/zenserver/monitoring/httpstats.cpp
index a82cfda50..de04294d0 100644
--- a/zenserver/monitoring/httpstats.cpp
+++ b/zenserver/monitoring/httpstats.cpp
@@ -19,14 +19,31 @@ HttpStatsService::BaseUri() const
 }
 
 void
+HttpStatsService::RegisterHandler(std::string_view Id, IHttpStatsProvider& Provider)
+{
+	RwLock::ExclusiveLockScope _(m_Lock);
+	m_Providers.insert_or_assign(std::string(Id), &Provider);
+}
+
+void
 HttpStatsService::HandleRequest(HttpServerRequest& Request)
 {
 	using namespace std::literals;
 
+	std::string_view Key = Request.RelativeUri();
+
 	switch (Request.RequestVerb())
 	{
+		case HttpVerb::kHead:
 		case HttpVerb::kGet:
-			return Request.WriteResponse(HttpResponseCode::OK, HttpContentType::kText, u8"OK!"sv);
+			if (auto It = m_Providers.find(std::string{Key}); It != end(m_Providers))
+			{
+				return It->second->HandleStatsRequest(Request);
+			}
+
+			[[fallthrough]];
+		default:
+			return;
 	}
 }