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, 15 insertions, 7 deletions

diff --git a/zenserver/cache/structuredcache.h b/zenserver/cache/structuredcache.h
index a360878bd..703e24ed3 100644
--- a/zenserver/cache/structuredcache.h
+++ b/zenserver/cache/structuredcache.h
@@ -5,6 +5,9 @@
 #include <zencore/stats.h>
 #include <zenhttp/httpserver.h>
 
+#include "monitoring/httpstats.h"
+#include "monitoring/httpstatus.h"
+
 #include <memory>
 
 namespace spdlog {
@@ -47,12 +50,14 @@ enum class CachePolicy : uint8_t;
  *
  */
 
-class HttpStructuredCacheService : public zen::HttpService
+class HttpStructuredCacheService : public HttpService, public IHttpStatsProvider, public IHttpStatusProvider
 {
 public:
 	HttpStructuredCacheService(ZenCacheStore&				  InCacheStore,
-							   zen::CasStore&				  InCasStore,
-							   zen::CidStore&				  InCidStore,
+							   CasStore&					  InCasStore,
+							   CidStore&					  InCidStore,
+							   HttpStatsService&			  StatsService,
+							   HttpStatusService&			  StatusService,
 							   std::unique_ptr<UpstreamCache> UpstreamCache);
 	~HttpStructuredCacheService();
 
@@ -86,13 +91,16 @@ private:
 	void			   HandleGetCachePayload(zen::HttpServerRequest& Request, const CacheRef& Ref, CachePolicy Policy);
 	void			   HandlePutCachePayload(zen::HttpServerRequest& Request, const CacheRef& Ref, CachePolicy Policy);
 	void			   HandleCacheBucketRequest(zen::HttpServerRequest& Request, std::string_view Bucket);
-	void			   HandleStatusRequest(zen::HttpServerRequest& Request);
+	virtual void	   HandleStatsRequest(zen::HttpServerRequest& Request) override;
+	virtual void	   HandleStatusRequest(zen::HttpServerRequest& Request) override;
 
 	spdlog::logger&				   Log() { return m_Log; }
 	spdlog::logger&				   m_Log;
-	zen::ZenCacheStore&			   m_CacheStore;
-	zen::CasStore&				   m_CasStore;
-	zen::CidStore&				   m_CidStore;
+	ZenCacheStore&				   m_CacheStore;
+	HttpStatsService&			   m_StatsService;
+	HttpStatusService&			   m_StatusService;
+	CasStore&					   m_CasStore;
+	CidStore&					   m_CidStore;
 	std::unique_ptr<UpstreamCache> m_UpstreamCache;
 	uint64_t					   m_LastScrubTime = 0;
 	metrics::OperationTiming	   m_HttpRequests;