Merge pull request #7076 from Icinga/bugfix/eventqueue-leak

/v1/events: terminate on disconnect

lib/remote/actionshandler.cpp

@@ -20,7 +20,7 @@ bool ActionsHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/actionshandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 };
 

lib/remote/configfileshandler.cpp

@@ -20,7 +20,7 @@ bool ConfigFilesHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/configfileshandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 };
 

lib/remote/configpackageshandler.cpp

@@ -18,7 +18,7 @@ bool ConfigPackagesHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/configpackageshandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 
 private:

lib/remote/configstageshandler.cpp

@@ -19,7 +19,7 @@ bool ConfigStagesHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/configstageshandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 
 private:

lib/remote/consolehandler.cpp

@@ -61,7 +61,7 @@ bool ConsoleHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/consolehandler.hpp

@@ -30,7 +30,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 
 	static std::vector<String> GetAutocompletionSuggestions(const String& word, ScriptFrame& frame);

lib/remote/createobjecthandler.cpp

@@ -22,7 +22,7 @@ bool CreateObjectHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/createobjecthandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 };
 

lib/remote/deleteobjecthandler.cpp

@@ -22,7 +22,7 @@ bool DeleteObjectHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/deleteobjecthandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 };
 

lib/remote/eventqueue.cpp

@@ -5,6 +5,7 @@
 #include "base/io-engine.hpp"
 #include "base/singleton.hpp"
 #include "base/logger.hpp"
+#include "base/utility.hpp"
 #include <boost/asio/spawn.hpp>
 
 using namespace icinga;
@@ -102,21 +103,31 @@ Dictionary::Ptr EventQueue::WaitForEvent(void *client, double timeout)
 	}
 }
 
-Dictionary::Ptr EventQueue::WaitForEvent(void *client, boost::asio::yield_context yc)
+Dictionary::Ptr EventQueue::WaitForEvent(void *client, boost::asio::yield_context yc, double timeout)
 {
+	double deadline = -1.0;
+
 	for (;;) {
 		{
-			boost::mutex::scoped_lock lock(m_Mutex);
+			boost::mutex::scoped_try_lock lock(m_Mutex);
 
+			if (lock.owns_lock()) {
 				auto it = m_Events.find(client);
 				ASSERT(it != m_Events.end());
 
-			if (!it->second.empty()) {
+				if (it->second.empty()) {
+					if (deadline == -1.0) {
+						deadline = Utility::GetTime() + timeout;
+					} else if (Utility::GetTime() >= deadline) {
+						return nullptr;
+					}
+				} else {
 					Dictionary::Ptr result = *it->second.begin();
 					it->second.pop_front();
 					return result;
 				}
 			}
+		}
 
 		IoBoundWorkSlot dontLockTheIoThreadWhileWaiting (yc);
 	}

lib/remote/eventqueue.hpp

@@ -32,7 +32,7 @@ public:
 	void SetFilter(std::unique_ptr<Expression> filter);
 
 	Dictionary::Ptr WaitForEvent(void *client, double timeout = 5);
-	Dictionary::Ptr WaitForEvent(void *client, boost::asio::yield_context yc);
+	Dictionary::Ptr WaitForEvent(void *client, boost::asio::yield_context yc, double timeout = 5);
 
 	static std::vector<EventQueue::Ptr> GetQueuesForType(const String& type);
 	static void UnregisterIfUnused(const String& name, const EventQueue::Ptr& queue);

lib/remote/eventshandler.cpp

@@ -25,7 +25,7 @@ bool EventsHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace asio = boost::asio;
@@ -88,7 +88,7 @@ bool EventsHandler::HandleRequest(
 		EventQueue::UnregisterIfUnused(queueName, queue);
 	});
 
-	hasStartedStreaming = true;
+	server.StartStreaming();
 
 	response.result(http::status::ok);
 	response.set(http::field::content_type, "application/json");
@@ -101,9 +101,13 @@ bool EventsHandler::HandleRequest(
 	}
 
 	asio::const_buffer newLine ("\n", 1);
+	AsioConditionVariable dontLockOwnStrand (stream.get_io_service(), true);
 
 	for (;;) {
-		String body = JsonEncode(queue->WaitForEvent(&request, yc));
+		auto event (queue->WaitForEvent(&request, yc));
+
+		if (event) {
+			String body = JsonEncode(event);
 
 			boost::algorithm::replace_all(body, "\n", "");
 
@@ -114,6 +118,11 @@ bool EventsHandler::HandleRequest(
 			asio::async_write(stream, payload, yc);
 			asio::async_write(stream, newLine, yc);
 			stream.async_flush(yc);
+		} else if (server.Disconnected()) {
+			return true;
+		} else {
+			dontLockOwnStrand.Wait(yc);
+		}
 	}
 }
 

lib/remote/eventshandler.hpp

@@ -22,7 +22,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 };
 

lib/remote/httphandler.cpp

@@ -51,7 +51,7 @@ void HttpHandler::ProcessRequest(
 	boost::beast::http::request<boost::beast::http::string_body>& request,
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	Dictionary::Ptr node = m_UrlTree;
@@ -99,7 +99,7 @@ void HttpHandler::ProcessRequest(
 
 	bool processed = false;
 	for (const HttpHandler::Ptr& handler : handlers) {
-		if (handler->HandleRequest(stream, user, request, url, response, params, yc, hasStartedStreaming)) {
+		if (handler->HandleRequest(stream, user, request, url, response, params, yc, server)) {
 			processed = true;
 			break;
 		}

lib/remote/httphandler.hpp

@@ -6,6 +6,7 @@
 #include "remote/i2-remote.hpp"
 #include "remote/url.hpp"
 #include "remote/httpresponse.hpp"
+#include "remote/httpserverconnection.hpp"
 #include "remote/apiuser.hpp"
 #include "base/registry.hpp"
 #include "base/tlsstream.hpp"
@@ -34,7 +35,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) = 0;
 
 	static void Register(const Url::Ptr& url, const HttpHandler::Ptr& handler);
@@ -44,7 +45,7 @@ public:
 		boost::beast::http::request<boost::beast::http::string_body>& request,
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	);
 
 private:

lib/remote/httpserverconnection.cpp

@@ -31,7 +31,7 @@ using namespace icinga;
 auto const l_ServerHeader ("Icinga/" + Application::GetAppVersion());
 
 HttpServerConnection::HttpServerConnection(const String& identity, bool authenticated, const std::shared_ptr<AsioTlsStream>& stream)
-	: m_Stream(stream), m_Seen(Utility::GetTime()), m_IoStrand(stream->get_io_service()), m_ShuttingDown(false)
+	: m_Stream(stream), m_Seen(Utility::GetTime()), m_IoStrand(stream->get_io_service()), m_ShuttingDown(false), m_HasStartedStreaming(false)
 {
 	if (authenticated) {
 		m_ApiUser = ApiUser::GetByClientCN(identity);
@@ -91,6 +91,34 @@ void HttpServerConnection::Disconnect()
 	});
 }
 
+void HttpServerConnection::StartStreaming()
+{
+	namespace asio = boost::asio;
+
+	m_HasStartedStreaming = true;
+
+	HttpServerConnection::Ptr keepAlive (this);
+
+	asio::spawn(m_IoStrand, [this, keepAlive](asio::yield_context yc) {
+		if (!m_ShuttingDown) {
+			char buf[128];
+			asio::mutable_buffer readBuf (buf, 128);
+			boost::system::error_code ec;
+
+			do {
+				m_Stream->async_read_some(readBuf, yc[ec]);
+			} while (!ec);
+
+			Disconnect();
+		}
+	});
+}
+
+bool HttpServerConnection::Disconnected()
+{
+	return m_ShuttingDown;
+}
+
 static inline
 bool EnsureValidHeaders(
 	AsioTlsStream& stream,
@@ -375,17 +403,17 @@ bool ProcessRequest(
 	boost::beast::http::request<boost::beast::http::string_body>& request,
 	ApiUser::Ptr& authenticatedUser,
 	boost::beast::http::response<boost::beast::http::string_body>& response,
+	HttpServerConnection& server,
+	bool& hasStartedStreaming,
 	boost::asio::yield_context& yc
 )
 {
 	namespace http = boost::beast::http;
 
-	bool hasStartedStreaming = false;
-
 	try {
 		CpuBoundWork handlingRequest (yc);
 
-		HttpHandler::ProcessRequest(stream, authenticatedUser, request, response, yc, hasStartedStreaming);
+		HttpHandler::ProcessRequest(stream, authenticatedUser, request, response, yc, server);
 	} catch (const std::exception& ex) {
 		if (hasStartedStreaming) {
 			return false;
@@ -481,7 +509,7 @@ void HttpServerConnection::ProcessMessages(boost::asio::yield_context yc)
 
 			m_Seen = std::numeric_limits<decltype(m_Seen)>::max();
 
-			if (!ProcessRequest(*m_Stream, request, authenticatedUser, response, yc)) {
+			if (!ProcessRequest(*m_Stream, request, authenticatedUser, response, *this, m_HasStartedStreaming, yc)) {
 				break;
 			}
 

lib/remote/httpserverconnection.hpp

@@ -27,6 +27,9 @@ public:
 
 	void Start();
 	void Disconnect();
+	void StartStreaming();
+
+	bool Disconnected();
 
 private:
 	ApiUser::Ptr m_ApiUser;
@@ -35,6 +38,7 @@ private:
 	String m_PeerAddress;
 	boost::asio::io_service::strand m_IoStrand;
 	bool m_ShuttingDown;
+	bool m_HasStartedStreaming;
 
 	void ProcessMessages(boost::asio::yield_context yc);
 	void CheckLiveness(boost::asio::yield_context yc);

lib/remote/infohandler.cpp

@@ -16,7 +16,7 @@ bool InfoHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/infohandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 };
 

lib/remote/modifyobjecthandler.cpp

@@ -20,7 +20,7 @@ bool ModifyObjectHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/modifyobjecthandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 };
 

lib/remote/objectqueryhandler.cpp

@@ -95,7 +95,7 @@ bool ObjectQueryHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/objectqueryhandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 
 private:

lib/remote/statushandler.cpp

@@ -76,7 +76,7 @@ bool StatusHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/statushandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 };
 

lib/remote/templatequeryhandler.cpp

@@ -83,7 +83,7 @@ bool TemplateQueryHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/templatequeryhandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 };
 

lib/remote/typequeryhandler.cpp

@@ -54,7 +54,7 @@ bool TypeQueryHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/typequeryhandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 };
 

lib/remote/variablequeryhandler.cpp

@@ -64,7 +64,7 @@ bool VariableQueryHandler::HandleRequest(
 	boost::beast::http::response<boost::beast::http::string_body>& response,
 	const Dictionary::Ptr& params,
 	boost::asio::yield_context& yc,
-	bool& hasStartedStreaming
+	HttpServerConnection& server
 )
 {
 	namespace http = boost::beast::http;

lib/remote/variablequeryhandler.hpp

@@ -21,7 +21,7 @@ public:
 		boost::beast::http::response<boost::beast::http::string_body>& response,
 		const Dictionary::Ptr& params,
 		boost::asio::yield_context& yc,
-		bool& hasStartedStreaming
+		HttpServerConnection& server
 	) override;
 };