add otel instrumentation (#581)

this change adds OTEL tracing to a few places

* Top-level application lifecycle (config/init/cleanup, main loop)
* http.sys requests

it also brings some otlptrace optimizations and dynamic configuration of tracing. OTLP tracing is currently always disabled

1 files changed, 5 insertions, 2 deletions

diff --git a/src/zenhttp/include/zenhttp/httpserver.h b/src/zenhttp/include/zenhttp/httpserver.h
index 9e5c41ab7..074e40734 100644
--- a/src/zenhttp/include/zenhttp/httpserver.h
+++ b/src/zenhttp/include/zenhttp/httpserver.h
@@ -24,13 +24,14 @@
 namespace zen {
 
 class CbPackage;
+class HttpService;
 
 /** HTTP Server Request
  */
 class HttpServerRequest
 {
 public:
-	HttpServerRequest();
+	explicit HttpServerRequest(HttpService& Service);
 	~HttpServerRequest();
 
 	// Synchronous operations
@@ -38,6 +39,7 @@ public:
 	[[nodiscard]] inline std::string_view RelativeUri() const { return m_Uri; }	 // Returns URI without service prefix
 	[[nodiscard]] std::string_view		  RelativeUriWithExtension() const { return m_UriWithExtension; }
 	[[nodiscard]] inline std::string_view QueryString() const { return m_QueryString; }
+	[[nodiscard]] inline std::string_view BaseUri() const { return m_BaseUri; }	 // Service prefix
 
 	struct QueryParams
 	{
@@ -120,7 +122,8 @@ protected:
 	HttpContentType	 m_ContentType	 = HttpContentType::kBinary;
 	HttpContentType	 m_AcceptType	 = HttpContentType::kUnknownContentType;
 	uint64_t		 m_ContentLength = ~0ull;
-	std::string_view m_Uri;
+	std::string_view m_BaseUri;	 // Base URI path of the service handling this request
+	std::string_view m_Uri;		 // URI without service prefix
 	std::string_view m_UriWithExtension;
 	std::string_view m_QueryString;
 	mutable uint32_t m_RequestId = ~uint32_t(0);