Fix sync issues with unsubscribe

src/CMakeLists.txt

@@ -130,6 +130,7 @@ target_include_directories(common PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/cubic/sdr)
 target_include_directories(scan PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/cubic/sdr)
 
 target_sources(piscan_server PUBLIC 
+    ${CMAKE_CURRENT_SOURCE_DIR}/EventBroker.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/ScannerSM.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/ServerManager.cpp
 )

src/EventBroker.cpp

@@ -0,0 +1,96 @@
+#include <tuple>
+
+#include "EventBroker.h"
+#include "events.h"
+#include "loguru.hpp"
+
+namespace piscan {
+    namespace events {
+        void publish(EventPtr event) {
+            EventBroker::instance()->publish(event);
+        }
+
+        void subscribe(std::string topic, int subscriber, EventHandler handler){
+            EventBroker::instance()->subscribe(topic, subscriber, std::move(handler));
+        }
+
+        void unsubscribe(std::string topic, int subscriber){
+            EventBroker::instance()->unsubscribe(topic, subscriber);
+        }
+    }
+
+    std::shared_ptr<EventBroker> EventBroker::_instance = nullptr;
+    std::shared_ptr<EventBroker> EventBroker::instance() {
+        if(!_instance){
+            _instance = std::make_shared<EventBroker>();
+        }
+        return _instance;
+    }
+
+    EventBroker::EventBroker() : WorkerThread("Event Broker") {
+
+    }
+
+    void EventBroker::publish(events::EventPtr event) {
+        _eventQueue.enqueue(event);
+        postWorkAvailable();
+    }
+
+    void EventBroker::subscribe(std::string topic, int subscriber, events::EventHandler handler) {
+        std::unique_lock<std::mutex> lock(_handler_mutex);
+        if (_handlers.find(topic) == _handlers.end()) {
+            _handlers[topic] = std::map<int, events::EventHandler>();
+        }
+
+        _handlers[topic][subscriber] = std::move(handler);
+    }
+
+    void EventBroker::unsubscribe(std::string topic, int subscriber) {
+        std::unique_lock<std::mutex> lock(_handler_mutex);
+        _handlers[topic].erase(subscriber);
+    }
+
+    void EventBroker::main() {
+        events::EventPtr event;
+        if(!_eventQueue.try_dequeue(event)) {
+            workAvailable = false;
+            return;
+        }
+
+        std::string& topic = event->topic;
+
+        std::unique_lock<std::mutex> lock(_handler_mutex);
+        // Support for regex subscriptions may be added later
+        auto found = _handlers.find(topic);
+        if (found != _handlers.end()){
+            for (auto handler = _handlers[topic].begin(); handler != _handlers[topic].end(); handler++){
+                try {
+                    if ((*handler).second == nullptr) {
+                        _handlers[topic].erase((*handler).first);
+                        continue;
+                    }
+                    (*handler).second(event);
+                } catch (std::exception& e) {
+                    LOG_F(WARNING, "Invalid event handler encountered, deleting");
+                    _handlers[topic].erase((*handler).first);
+                }
+            }
+        }
+        // 'All events' subscription
+        found = _handlers.find("*");
+        if (found != _handlers.end()){
+            for (auto handler = _handlers["*"].begin(); handler != _handlers["*"].end(); handler++){
+                try {
+                    if ((*handler).second == nullptr) {
+                        _handlers[topic].erase((*handler).first);
+                        continue;
+                    }
+                    (*handler).second(event);
+                } catch (std::exception& e) {
+                    LOG_F(WARNING, "Invalid event handler encountered, deleting");
+                    _handlers[topic].erase((*handler).first);
+                }
+            }
+        }
+    }
+}

src/EventBroker.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <memory>
+#include <map>
+#include <vector>
+#include <tuple>
+
+#include "Thread.h"
+#include "events.h"
+#include "concurrentqueue.h"
+
+namespace piscan {
+
+class EventBroker : public WorkerThread {
+public:
+    static std::shared_ptr<EventBroker> instance();
+
+    EventBroker();
+    virtual ~EventBroker(){};
+
+    void publish(events::EventPtr event);
+    void subscribe(std::string topic, int subscriber, events::EventHandler handler);
+    void unsubscribe(std::string topic, int subscriber);
+
+protected:
+    //EventBroker();
+
+    void main();
+
+private:
+    static std::shared_ptr<EventBroker> _instance;
+
+    moodycamel::ConcurrentQueue<events::EventPtr> _eventQueue;
+
+    std::map<std::string, std::map<int, events::EventHandler>> _handlers;
+    std::mutex _handler_mutex;
+
+    void _subscribe(std::string topic, int subscriber, events::EventHandler handler);
+    void _unsubscribe(std::string topic, int subscriber);
+};
+
+}

src/PiScan.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <vector>
+#include <tuple>
 
 #include "messages/context.h"
 #include "Configuration.h"
@@ -15,6 +16,13 @@ class DemodInterface;
 namespace piscan {
 namespace app {
 
+enum ReturnStatus {
+	SUCCESS,
+	INVALID,
+	NOT_IMPLEMENTED,
+};
+typedef std::tuple<ReturnStatus, void*> BasicReturnTuple;
+
 struct ManualEntryData {
 public:
 	ManualEntryData(ManualEntryData& copy) : freq(copy.freq), modulation(copy.modulation){};
@@ -55,9 +63,9 @@ long long getTunerSampleRate();
 
 /* server functions */
 namespace server {
-void scannerContextUpdate(piscan::server::context::ScannerContext ctx);
+/*void scannerContextUpdate(piscan::server::context::ScannerContext ctx);
 void demodContextUpdate(piscan::server::context::DemodContext ctx);
-void signalLevelUpdate(int level);
+void signalLevelUpdate(int level);*/
 }
 
 /* audio related */
@@ -65,5 +73,140 @@ namespace audio {
 AudioThread* getAudioController();
 }
 
+/* database */
+namespace data {
+/*
+	Retrieve the entire System tree
+*/	
+BasicReturnTuple getScanList(); //TODO
+
+/*
+	Retrieve list of Systems and their indices, tags, and types
+*/
+BasicReturnTuple getSystemList();
+
+/*
+	Retrieve tree of System and its Entries at index
+*/
+BasicReturnTuple getSystemByIndex(size_t sys_index); //TODO
+
+/*
+	Retrieve list of Entries within indexed System and their indices and descriptors
+*/
+BasicReturnTuple getEntryList(size_t sys_index);
+
+/*
+	Retrieve Entry at index
+*/
+BasicReturnTuple getEntryByIndex(size_t sys_index, size_t entry_index); //TODO
+
+namespace system {
+	/* 
+		Create a new Radio System
+	*/
+	BasicReturnTuple create(/*TODO data*/);
+
+	/* 
+		Replace the Radio System header at index. Entries will be retained unless the system type is changed.
+	*/
+	BasicReturnTuple replace(size_t sys_index /*, TODO new*/);
+
+	/*
+		Remove the Radio System and its Entries at index. Indices of succeeding Systems will be updated upon success
+	*/
+	BasicReturnTuple remove(size_t sys_index);
+
+	/*
+		Set lockout status of System at index.
+		- '0' for unlocked
+		- '-1' for persistent lock
+		- '>1' lock for duration in seconds
+	*/
+	BasicReturnTuple setLockout(size_t sys_index, int duration_seconds);
+
+	/*
+		Move Radio System from original index to new index. All other indices are updated upon success
+	*/
+	BasicReturnTuple setIndex(size_t original_sys_index, size_t new_sys_index);
+
+	namespace entry {
+		/* 
+			Create a new Entry within the indexed System
+		*/
+		BasicReturnTuple create(size_t sys_index /*,TODO data*/);
+
+		/* 
+			Replace the Entry at index
+		*/
+		BasicReturnTuple replace(size_t sys_index, size_t entry_index /*, TODO new*/);
+
+		/* 
+			Remove the Entry at index. Succeeding indices within the System are updated upon success
+		*/
+		BasicReturnTuple remove(size_t sys_index, size_t entry_index);
+
+		/*
+			Set lockout status of Entry at index.
+			- '0' for unlocked
+			- '-1' for persistent lock
+			- '>1' lock for duration in seconds
+		*/
+		BasicReturnTuple setLockout(size_t sys_index, size_t entry_index, int duration_seconds);
+
+		/*
+			Move Entry within System from original index to new index. All other indices are updated upon success
+		*/
+		BasicReturnTuple setIndex(size_t sys_index, size_t original_entry_index, size_t new_entry_index);
+	}
+}
+}
+
+namespace configuration {
+	/*
+	Retrieve the full system configuration
+	*/
+	BasicReturnTuple getFullConfig();
+
+	/*
+	Set the full system configuration. Requires restart
+	*/
+	BasicReturnTuple setConfig(/*TODO*/);
+
+	/*
+	Retrieve general configuration
+	*/
+	BasicReturnTuple getGeneralConfig();
+
+	/*
+	Set the general configuration
+	*/
+	BasicReturnTuple setGeneralConfig(/*TODO*/);
+
+	/*
+	Retrieve configuration for demodulators
+	*/
+	BasicReturnTuple getDemodConfig();
+
+	/*
+	Set the configuration for demodulators. Restart bit required
+	*/
+	BasicReturnTuple setDemodConfig(/*TODO*/);
+
+	/*
+	Retrieve configuration for RTSP server
+	*/
+	BasicReturnTuple getAudioServerConfig();
+
+	/*
+	Set the configuration for RTSP server. Requires restart
+	*/
+	BasicReturnTuple setAudioServerConfig(/*TODO*/);
+
+	/*
+	Retrieve a list of configured tuners
+	*/
+	BasicReturnTuple getTunerList();
+}
+
 } // namespace app
 } // namespace piscan

src/ScannerSM.cpp

@@ -7,6 +7,7 @@
 
 #include <unistd.h>
 #include <mutex>
+#include <map>
 
 #include "PiScan.h"
 #include "ScannerSM.h"
@@ -18,7 +19,7 @@
 #include "RadioSystem.h"
 #include "request.h"
 #include "Configuration.h"
-
+#include "events.h"
 
 #define DELAY_TIMEOUT	2.0
 
@@ -334,6 +335,7 @@ void ScannerSM::ST_Stopped(EventData* /* data */){
 
 void ScannerSM::_broadcastContextUpdate() {
 	DLOG_F(6, "Broadcasting context");
+	// TODO old context remain until new request system setup
 	lock_guard<mutex> lock(_contextMutex);
 	if (_currentContext.state != piscan::server::context::ScannerContext::SCAN)
 	{
@@ -359,7 +361,38 @@ void ScannerSM::_broadcastContextUpdate() {
 		_currentContext.clearFields();
 	}
 	
-	app::server::scannerContextUpdate(_currentContext);
+	/*app::server::scannerContextUpdate(_currentContext);*/
+
+	/* EVENT BASED IMPLEMENTATION */
+	events::ScannerStateEvent event;
+	std::map<unsigned char, events::ScannerStateEvent::ScannerState> states = {
+		std::make_pair(States::ST_HOLD, events::ScannerStateEvent::ScannerState::HOLD),
+		std::make_pair(States::ST_SCAN, events::ScannerStateEvent::ScannerState::SCAN),
+		std::make_pair(States::ST_RECEIVE, events::ScannerStateEvent::ScannerState::RECEIVE),
+		std::make_pair(States::ST_LOAD, events::ScannerStateEvent::ScannerState::OTHER_STATE),
+		std::make_pair(States::ST_INVALID, events::ScannerStateEvent::ScannerState::OTHER_STATE),
+	};
+	event.state = states[currentState];
+	if (currentState != States::ST_SCAN) {
+		if (_manualMode)
+		{
+			event.systemTag = "Manual";
+			event.entryTag = "Manual entry";
+			event.entryIndex = "MAN";
+		}
+		else
+		{
+			//event.systemTag = _currentSystem->tag();
+			event.systemTag = _systems[_currentEntry->getSysIndex()]->tag();
+			event.entryTag = _currentEntry->tag();
+			event.entryIndex = to_string(_currentEntry->getSysIndex()) + "-" + to_string(_currentEntry->getEntryIndex());
+		}
+		event.frequency = _currentEntry->freq();
+		event.modulation = _currentEntry->modulation();
+		event.delayMS = _currentEntry->delayMS();
+		event.lockout = _currentEntry->isLockedOut();
+	}
+	events::publish(std::make_shared<events::ScannerStateEvent>(std::move(event)));
 }
 
 void ScannerSM::_enableAudioOut(bool en){

src/ServerManager.cpp

@@ -220,7 +220,7 @@ int ServerManager::giveRequest(void* request){
 }
 
 void ServerManager::_handleMessage(std::shared_ptr<Message> message){
-	assert(message->destination == SERVER_MAN);
+	//assert(message->destination == SERVER_MAN);
 	auto msg = std::dynamic_pointer_cast<ServerMessage>(message);
 	int* level = nullptr;
 	switch (msg->type) {

src/common/CMakeLists.txt

@@ -1,4 +1,5 @@
 add_library(common
+	${CMAKE_CURRENT_SOURCE_DIR}/config_api.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/Configuration.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/State.cpp
 )

src/common/config_api.cpp

@@ -0,0 +1,66 @@
+#include "PiScan.h"
+
+namespace piscan::app::configuration {
+	/*
+	*/
+	BasicReturnTuple getFullConfig()
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    }
+
+	/*
+	*/
+	BasicReturnTuple setConfig(/*TODO*/)
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    }
+
+	/*
+	*/
+	BasicReturnTuple getGeneralConfig()
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    }
+
+	/*
+	*/
+	BasicReturnTuple setGeneralConfig(/*TODO*/)
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    }
+
+	/*
+	*/
+	BasicReturnTuple getDemodConfig()
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    }
+
+	/*
+	*/
+	BasicReturnTuple setDemodConfig(/*TODO*/)
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    }
+
+	/*
+	*/
+	BasicReturnTuple getAudioServerConfig()
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    }
+
+	/*
+	*/
+	BasicReturnTuple setAudioServerConfig(/*TODO*/)
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    }
+
+	/*
+	*/
+	BasicReturnTuple getTunerList()
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    }
+}

src/cubic/sdr/SoapySDRThread.cpp

@@ -13,6 +13,7 @@
 #include "loguru.hpp"
 #include "threadname.h"
 #include "PiScan.h"
+#include "events.h"
 
 #define SDR_THREAD_NAME   "SDR Interface"
 
@@ -116,10 +117,13 @@ bool SDRThread::init() {
   
     //4. Apply other settings: Frequency, PPM correction, Gains,  Device-specific settings:
     device->setFrequency(SOAPY_SDR_RX,0,"RF",frequency - offset.load());
+    //TEMP
+    piscan::events::publish(std::make_shared<piscan::events::GenericNumberEvent>("tuner_frequency_set", frequency - offset.load()));
 
     if (devInfo->hasCORR(SOAPY_SDR_RX, 0)) {
         hasPPM.store(true);
         device->setFrequency(SOAPY_SDR_RX,0,"CORR",ppm.load());
+        piscan::events::publish(std::make_shared<piscan::events::GenericNumberEvent>("tuner_ppm_set", ppm.load()));
     } else {
         hasPPM.store(false);
     }
@@ -514,6 +518,7 @@ void SDRThread::updateSettings() {
     
     if (ppm_changed.load() && hasPPM.load()) {
         device->setFrequency(SOAPY_SDR_RX,0,"CORR",ppm.load());
+        piscan::events::publish(std::make_shared<piscan::events::GenericNumberEvent>("tuner_ppm_set", ppm.load()));
         ppm_changed.store(false);
     }
     
@@ -521,8 +526,10 @@ void SDRThread::updateSettings() {
         if (frequency_locked.load() && !frequency_lock_init.load()) {
             device->setFrequency(SOAPY_SDR_RX,0,"RF",lock_freq.load());
             frequency_lock_init.store(true);
+            piscan::events::publish(std::make_shared<piscan::events::GenericNumberEvent>("tuner_frequency_set", lock_freq.load()));
         } else if (!frequency_locked.load()) {
             device->setFrequency(SOAPY_SDR_RX,0,"RF",frequency.load() - offset.load());
+            piscan::events::publish(std::make_shared<piscan::events::GenericNumberEvent>("tuner_frequency_set", frequency.load() - offset.load()));
         }
         freq_changed.store(false);
 

src/events.h

@@ -0,0 +1,125 @@
+#pragma once
+
+#include <memory>
+#include <functional>
+
+namespace piscan {
+    namespace events {
+        struct Event {
+            Event(std::string topic) : topic(topic) {};
+            virtual ~Event(){};
+
+            inline virtual std::string to_string() {
+                return "Event type: " + topic + "\n";
+            }
+            
+            std::string topic;
+        };
+
+        typedef std::shared_ptr<Event> EventPtr;
+        typedef std::function<void(std::shared_ptr<Event>)> EventHandler;
+        //typedef std::shared_ptr<EventHandler> EventHandler;
+
+        void publish(EventPtr event);
+
+        void subscribe(std::string topic, int subscriber, EventHandler handler);
+
+        void unsubscribe(std::string topic, int subscriber);
+
+        /*---------------------------------*/
+        struct GenericStringEvent : public Event {
+            GenericStringEvent(std::string topic, std::string data) : Event(topic), data(data) {};
+            virtual ~GenericStringEvent() {};
+            inline virtual std::string to_string() {
+                return Event::to_string() + "\tData:\t" + data + "\n";
+            }
+            std::string data;
+        };
+
+        struct GenericNumberEvent : public Event {
+            GenericNumberEvent(std::string topic, long long data) : Event(topic), data(data) {};
+            virtual ~GenericNumberEvent() {};
+            inline virtual std::string to_string() {
+                return Event::to_string() + "\tData:\t" + std::to_string(data) + "\n";
+            }
+            long long data;
+        };
+
+        struct GenericBoolEvent : public Event {
+            GenericBoolEvent(std::string topic, bool data) : Event(topic), data(data) {};
+            virtual ~GenericBoolEvent() {};
+            inline virtual std::string to_string() {
+                return Event::to_string() + "\tData:\t" + std::to_string(data) + "\n";
+            }
+            bool data;
+        };
+
+        struct ScannerStateEvent : public Event {
+            virtual ~ScannerStateEvent() {};
+
+            enum ScannerState {
+                OTHER_STATE,
+                SCAN,
+                HOLD,
+                RECEIVE,
+            };
+
+            ScannerStateEvent() : Event("scanner_state_change") {};
+
+            inline virtual std::string to_string() {
+                std::string tail = (state == HOLD || state == RECEIVE)?
+                "\tSystem:\t" + systemTag + "\n" +
+                "\tEntry:\t" + entryTag + "\n" +
+                "\tFrequency:\t" + std::to_string(frequency) + "\n" +
+                "\tModulation:\t" + modulation + "\n" + 
+                "\tIndex:\t" + entryIndex + "\n" +
+                "\tDelay:\t" + std::to_string(delayMS) + "\n" +
+                "\tLockout:\t" + std::to_string(lockout) + "\n"
+                : "";
+                return Event::to_string() + 
+                "\tState:\t" + std::to_string(state) + "\n" + tail;
+            }
+
+            //TODO ported from context messages
+            ScannerState state = OTHER_STATE;
+            std::string systemTag = "";
+            std::string entryTag = "";
+            long long frequency = 0;
+            std::string modulation = "";
+            std::string entryIndex = "";
+            int delayMS = 0;
+            bool lockout = false;
+        };
+
+        struct DemodStateEvent : public Event {
+            DemodStateEvent() : Event("demod_state_change") {};
+            virtual ~DemodStateEvent() {};
+            inline virtual std::string to_string() {
+                return Event::to_string() + 
+                "\tTuner gain:\t" + std::to_string(tunerGainState) + "\n"
+                "\tSquelch:\t" + std::to_string(squelchState) + "\n";
+            }
+            float tunerGainState;
+            int squelchState;
+        };
+
+        struct SignalLevelEvent : public Event {
+            SignalLevelEvent(int level) : Event("signal_level"), level(level) {};
+            virtual ~SignalLevelEvent(){};
+            inline virtual std::string to_string() {
+                return Event::to_string() + "\tSignal level:\t" + std::to_string(level) + "\n";
+            }
+            int level;
+        };
+
+        struct LoggingEvent : public Event {
+            LoggingEvent(int level, std::string line) : Event("log_write"), level(level), line(line) {};
+            virtual ~LoggingEvent(){};
+            inline virtual std::string to_string() {
+                return Event::to_string() + "\t> " + line + "\n";
+            }
+            int level;
+            std::string line;
+        };
+    }
+}

src/piscan_server.cpp

@@ -12,6 +12,7 @@
 #include "sigproc_types.h"
 #include "Demodulator.h"
 #include "Entry.h"
+#include "EventBroker.h"
 #include "loguru.hpp"
 #include "messages.h"
 #include "ServerManager.h"
@@ -55,6 +56,7 @@ static piscan::scan::SystemList scanSystems;
 static ScannerSM scannerInst(scanSystems);
 static ServerManager connectionManager(io_service);
 static piscan::sigproc::Demodulator demodInst;
+static std::shared_ptr<piscan::EventBroker> eventBroker = nullptr;
 
 static std::atomic_bool steadyState(false);
 
@@ -103,10 +105,15 @@ void exit(int code){
 	std::exit(code);
 }
 
+void printEvent(events::EventPtr event) {
+	std::cerr << event->to_string();
+}
+
 bool app::system::stopSystem(){
 	if(steadyState.load()){
 		return true;
 	}
+	sysRun = false;
 	return false;
 }
 
@@ -173,7 +180,7 @@ const piscan::server::context::SystemInfo app::system::getSystemInfo(){
 	return info;
 }
 
-void app::server::scannerContextUpdate(piscan::server::context::ScannerContext ctx){
+/*void app::server::scannerContextUpdate(piscan::server::context::ScannerContext ctx){
 	connectionManager.giveMessage(make_shared<ServerMessage>(SCANNER_SM, ServerMessage::CONTEXT_UPDATE, new piscan::server::context::ScannerContext(ctx)));
 }
 
@@ -183,7 +190,7 @@ void app::server::demodContextUpdate(piscan::server::context::DemodContext ctx){
 
 void app::server::signalLevelUpdate(int level){
 	connectionManager.giveMessage(make_shared<ServerMessage>(DEMOD, ServerMessage::SIGNAL_LEVEL, new int(level)));
-}
+}*/
 
 }
 
@@ -199,6 +206,8 @@ int main(int argc, char **argv) {
 
 	LOG_F(INFO, "Starting PiScan, version %s", PISCAN_VERSION);
 
+	eventBroker = EventBroker::instance();
+
 	piscan::config::Configuration& config = piscan::config::Configuration::getConfig();
 	piscan::config::State& state = piscan::config::State::getState();
 	bool useDebugConsole = false;
@@ -207,7 +216,7 @@ int main(int argc, char **argv) {
 	int logVerbosity = config.getGeneralConfig().logfileVerbosity;
 
 	int c;
-	while((c = getopt(argc,argv,"dp:f:l")) != -1){
+	while((c = getopt(argc,argv,"dp:f:le:")) != -1){
 		switch(c){
 			case 'd':
 				useDebugConsole = true;
@@ -223,6 +232,9 @@ int main(int argc, char **argv) {
 			case 'l':
 				spawnClient = true;
 				break;
+			case 'e':
+				std::cerr << "**Subscribe to event " << optarg << std::endl;
+				events::subscribe(optarg, 1, printEvent);
 		}
 	}
 
@@ -234,6 +246,7 @@ int main(int argc, char **argv) {
 
 	try {
 		{
+			eventBroker->start();
 			scannerInst.start();
 			connectionManager.start(useDebugConsole, spawnClient);
 			demodInst.start();
@@ -260,6 +273,8 @@ int main(int argc, char **argv) {
 	steadyState.store(true);
 	LOG_F(INFO, "System initialized");
 
+	events::publish(std::make_shared<events::Event>("system_started"));
+
 	while(sysRun)
 		usleep(100000);
 
@@ -267,6 +282,7 @@ int main(int argc, char **argv) {
 	steadyState.store(false);
 	try {
 		//sysControl.stop();
+		events::publish(std::make_shared<events::Event>("system_stopping"));
 
 		{
 			LOG_F(INFO, "Stopping system");
@@ -281,6 +297,9 @@ int main(int argc, char **argv) {
 		LOG_F(4, "demod wait");
 		demodInst.waitDeinit();
 
+		eventBroker->stop();
+		eventBroker->join();
+
 		LOG_F(2, "All modules stopped");
 		}
 	} catch (std::exception& e) {

src/scan/CMakeLists.txt

@@ -1,4 +1,5 @@
 add_library(scan
+	${CMAKE_CURRENT_SOURCE_DIR}/api.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/Entry.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/RadioSystem.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/SystemList.cpp

src/scan/api.cpp

@@ -0,0 +1,138 @@
+#include <tuple>
+
+#include "PiScan.h"
+
+namespace piscan::app::data
+{
+    /*
+	Retrieve the entire System tree
+*/
+    BasicReturnTuple getScanList()
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    }
+
+    /*
+	Retrieve list of Systems and their indices, tags, and types
+*/
+    BasicReturnTuple getSystemList()
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    }
+
+    /*
+	Retrieve tree of System and its Entries at index
+*/
+    BasicReturnTuple getSystemByIndex(size_t sys_index)
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    } //TODO
+
+    /*
+	Retrieve list of Entries within indexed System and their indices and descriptors
+*/
+    BasicReturnTuple getEntryList(size_t sys_index)
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    }
+
+    /*
+	Retrieve Entry at index
+*/
+    BasicReturnTuple getEntryByIndex(size_t sys_index, size_t entry_index)
+    {
+        return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+    } //TODO
+
+    namespace system
+    {
+        /* 
+		Create a new Radio System
+	*/
+        BasicReturnTuple create(/*TODO data*/)
+        {
+            return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+        }
+
+        /* 
+		Replace the Radio System header at index. Entries will be retained unless the system type is changed.
+	*/
+        BasicReturnTuple replace(size_t sys_index /*, TODO new*/)
+        {
+            return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+        }
+
+        /*
+		Remove the Radio System and its Entries at index. Indices of succeeding Systems will be updated upon success
+	*/
+        BasicReturnTuple remove(size_t sys_index)
+        {
+            return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+        }
+
+        /*
+		Set lockout status of System at index.
+		- '0' for unlocked
+		- '-1' for persistent lock
+		- '>1' lock for duration in seconds
+	*/
+        BasicReturnTuple setLockout(size_t sys_index, int duration_seconds)
+        {
+            return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+        }
+
+        /*
+		Move Radio System from original index to new index. All other indices are updated upon success
+	*/
+        BasicReturnTuple setIndex(size_t original_sys_index, size_t new_sys_index)
+        {
+            return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+        }
+
+        namespace entry
+        {
+            /* 
+			Create a new Entry within the indexed System
+		*/
+            BasicReturnTuple create(size_t sys_index /*,TODO data*/)
+            {
+                return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+            }
+
+            /* 
+			Replace the Entry at index
+		*/
+            BasicReturnTuple replace(size_t sys_index, size_t entry_index /*, TODO new*/)
+            {
+                return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+            }
+
+            /* 
+			Remove the Entry at index. Succeeding indices within the System are updated upon success
+		*/
+            BasicReturnTuple remove(size_t sys_index, size_t entry_index)
+            {
+                return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+            }
+
+            /*
+			Set lockout status of Entry at index.
+			- '0' for unlocked
+			- '-1' for persistent lock
+			- '>1' lock for duration in seconds
+		*/
+            BasicReturnTuple setLockout(size_t sys_index, size_t entry_index, int duration_seconds)
+            {
+                return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+            }
+
+            /*
+			Move Entry within System from original index to new index. All other indices are updated upon success
+		*/
+            BasicReturnTuple setIndex(size_t sys_index, size_t original_entry_index, size_t new_entry_index)
+            {
+                return std::make_tuple(NOT_IMPLEMENTED, nullptr);
+            }
+        }
+    }
+}

src/server/connection/Connection.cpp

@@ -5,9 +5,14 @@
  *      Author: ezra
  */
 
+#include <memory>
+#include <iostream>
+
 #include "PiScan.h"
 #include "connection.h"
 #include "request.h"
+#include "events.h"
+#include "messages/context.h"
 
 namespace piscan {
 namespace server {
@@ -74,6 +79,43 @@ int Connection::systemFunction(SystemFunction function) {
 	return issueRequest(params);
 }*/
 
+// TODO temporary workaround until new connection interfaces built
+bool Connection::connect() {
+	events::subscribe("scanner_state_change", (1000+_handle), [this](events::EventPtr event){
+		auto evt = std::dynamic_pointer_cast<events::ScannerStateEvent>(event);
+		piscan::server::context::ScannerContext ctx;
+		ctx.state = static_cast<context::ScannerContext::ScannerState>(evt->state);
+		ctx.systemTag = evt->systemTag;
+		ctx.entryTag = evt->entryTag;
+		ctx.frequency = evt->frequency;
+		ctx.modulation = evt->modulation;
+		ctx.entryIndex = evt->entryIndex;
+		ctx.delayMS = evt->delayMS;
+		ctx.lockout = evt->lockout;
+
+		contextUpdate(ctx);
+	});
+	events::subscribe("demod_state_change", (1000+_handle), [this](events::EventPtr event){
+		auto evt = std::dynamic_pointer_cast<events::DemodStateEvent>(event);
+		piscan::server::context::DemodContext ctx(evt->tunerGainState, evt->squelchState);
+
+		contextUpdate(ctx);
+	});
+	events::subscribe("signal_level", (1000+_handle), [this](events::EventPtr event){
+		auto evt = std::dynamic_pointer_cast<events::SignalLevelEvent>(event);
+
+		handleSignalLevel(evt->level);
+	});
+
+	return true;
+}
+
+void Connection::disconnect() {
+	events::unsubscribe("scanner_state_change", (1000+_handle));
+	events::unsubscribe("demod_state_change", (1000+_handle));
+	events::unsubscribe("signal_level", (1000+_handle));
+}
+
 int Connection::scanStart() {
 	//ClientRequest::RequestParams params = { .type = SCANNER_FUNCTION, .subType = SCANNER_STATE_SCAN };
 	//return issueRequest(params);

src/server/connection/DebugConsole.cpp

@@ -11,6 +11,7 @@
 #include <vector>
 #include <map>
 
+#include "PiScan.h"
 #include "DebugServer.h"
 #include "loguru.hpp"
 #include "threadname.h"
@@ -24,8 +25,10 @@ namespace connection {
 #define DS_THREAD_NAME	"DebugConsole"
 
 using namespace piscan;
+using piscan::app::BasicReturnTuple;
 
 bool DebugConsole::connect(){
+	Connection::connect();
 	std::cerr << "\nConnecting...\n";
 	_run = true;
 	_requestThread = std::thread(&DebugConsole::_consoleInputFunc, this);
@@ -33,6 +36,7 @@ bool DebugConsole::connect(){
 }
 
 void DebugConsole::disconnect(){
+	Connection::disconnect();
 	_run = false;
 
 	std::fprintf(stdin, "\n");
@@ -49,6 +53,37 @@ void DebugConsole::_consoleInputFunc() {
 	std::string intermediate;
 	std::cerr << "\nConsole connected\n";
 
+	std::map<app::ReturnStatus, std::string> friendlyReturnCodes;
+	friendlyReturnCodes[app::SUCCESS] = "Success";
+	friendlyReturnCodes[app::INVALID] = "Invalid parameters";
+	friendlyReturnCodes[app::NOT_IMPLEMENTED] = "Function not yet implemented";
+
+	std::map<std::string, std::function<piscan::app::BasicReturnTuple()>> apiMap;
+	apiMap["scanlist"] = []() { return app::data::getScanList(); };
+	apiMap["systems"] = []() { return app::data::getSystemList(); };
+	apiMap["systemat"] = [tokens]() { return app::data::getSystemByIndex(std::stoi(tokens[1])); };
+	apiMap["entrylist"] = [tokens]() { return app::data::getEntryList(std::stoi(tokens[1])); };
+	apiMap["entryat"] = [tokens]() { return app::data::getEntryByIndex(std::stoi(tokens[1]), std::stoi(tokens[2])); };
+	apiMap["createsystem"] = [tokens]() { return app::data::system::create(/*TODO*/); };
+	apiMap["replacesystem"] = [tokens]() { return app::data::system::replace(std::stoi(tokens[1])/*, TODO*/); };
+	apiMap["removesystem"] = [tokens]() { return app::data::system::remove(std::stoi(tokens[1])); };
+	apiMap["locksystem"] = [tokens]() { return app::data::system::setLockout(std::stoi(tokens[1]), std::stoi(tokens[2])); };
+	apiMap["setsystemindex"] = [tokens]() { return app::data::system::setIndex(std::stoi(tokens[1]), std::stoi(tokens[2])); };
+	apiMap["createentry"] = [tokens]() { return app::data::system::entry::create(std::stoi(tokens[1])/*,TODO*/); };
+	apiMap["replaceentry"] = [tokens]() { return app::data::system::entry::replace(std::stoi(tokens[1]), std::stoi(tokens[2])/*, TODO*/); };
+	apiMap["removeentry"] = [tokens]() { return app::data::system::entry::remove(std::stoi(tokens[1]), std::stoi(tokens[2])); };
+	apiMap["lockentry"] = [tokens]() { return app::data::system::entry::setLockout(std::stoi(tokens[1]), std::stoi(tokens[2]), std::stoi(tokens[3])); };
+	apiMap["setentryindex"] = [tokens]() { return app::data::system::entry::setIndex(std::stoi(tokens[1]), std::stoi(tokens[2]), std::stoi(tokens[3])); };
+	apiMap["config"] = []() { return app::configuration::getFullConfig(); };
+	apiMap["setconfig"] = [tokens]() { return app::configuration::setConfig(); };
+	apiMap["generalcfg"] = []() { return app::configuration::getGeneralConfig(); };
+	apiMap["setgeneralcfg"] = [tokens]() { return app::configuration::setGeneralConfig(); };
+	apiMap["demodcfg"] = []() { return app::configuration::getDemodConfig(); };
+	apiMap["setdemodcfg"] = [tokens]() { return app::configuration::setDemodConfig(); };
+	apiMap["rtspcfg"] = []() { return app::configuration::getAudioServerConfig(); };
+	apiMap["setrtspcfg"] = [tokens]() { return app::configuration::setAudioServerConfig(); };
+	apiMap["tunerlist"] = []() { return app::configuration::getTunerList(); };
+
 	getSystemInfo();
 	getScannerContext();
 	getDemodContext();
@@ -64,7 +99,8 @@ void DebugConsole::_consoleInputFunc() {
 		try {
 			if (!tokens[0].compare("exit")) {
 				_run = false;
-				systemFunction(SystemFunction::STOP);
+				//systemFunction(SystemFunction::STOP);
+				app::system::stopSystem();
 			}
 			else if (!tokens[0].compare("verbosity")){
 				loguru::g_stderr_verbosity = std::stoi(tokens[1]);
@@ -122,8 +158,16 @@ void DebugConsole::_consoleInputFunc() {
 						<< "\n\tget [subcommand]"
 						<< "\n\t\tcontext\t\tReturns scanner status"
 						<< "\n";
+				for (auto cmd = apiMap.begin(); cmd != apiMap.end(); cmd++) {
+					std::cerr << "\t" << cmd->first << "\n";
+				}
 			} else
+				try {
+					auto ret = apiMap[tokens[0]]();
+					std::cerr << "Status: " << friendlyReturnCodes[std::get<0>(ret)] << "\n";
+				} catch (std::exception& e) {
 				std::cerr << "Invalid command\n";
+				}
 		} catch (std::exception& e) {
 			std::cerr << "Argument missing or typo in the command\n";
 		}

src/server/connection/SocketConnection.cpp

@@ -21,11 +21,13 @@ namespace server {
 namespace connection {
 
 bool SocketConnection::connect(){
+	Connection::connect();
 	_startRead();
 	return true;
 }
 
 void SocketConnection::disconnect(){
+	Connection::disconnect();
 	if (_socket.is_open()) {
 		_socket.close();
 		notifyDisconnected();

src/server/connection/connection.h

@@ -42,8 +42,8 @@ public:
 		_level(lvl), _audio(aud), _serverManager(nullptr), _handle(HANDLE_NULL) {}
 	virtual ~Connection() {};
 
-	virtual bool connect() = 0;
+	virtual bool connect();
-	virtual void disconnect() = 0;
+	virtual void disconnect();
 	virtual void contextUpdate(const piscan::server::context::ScannerContext context) = 0;
 	virtual void contextUpdate(const piscan::server::context::DemodContext context) = 0;
 	virtual void handleSystemMessage(const piscan::server::context::GeneralMessage message) = 0;

src/sigproc/Demodulator.cpp

@@ -11,6 +11,7 @@
 #include "PiScan.h"
 #include "Demodulator.h"
 #include "loguru.hpp"
+#include "events.h"
 
 #define INIT_FREQUENCY			100000000
 #define NUM_RATES_DEFAULT	4
@@ -115,7 +116,8 @@ void Demodulator::start(){
 		int level = getSignalStrength();
 
 		LOG_F(7, "Signal strength %i", level);
-		app::server::signalLevelUpdate(level);
+		//app::server::signalLevelUpdate(level);
+		events::publish(std::make_shared<events::SignalLevelEvent>(level));
 	});
 	//_sigLevelRefresher = new IntervalTimer();
 	_sigLevelRefresher.create(SIGLEVEL_REFRESH_INTERVAL, func);
@@ -145,6 +147,8 @@ bool Demodulator::setFrequency(long long freq) {
 		DLOG_F(9, "Frequency already set");
 		return true;
 	}*/
+	if(freq == _currentFreq) 
+		return true;
 
 	_demodMgr.getCurrentModem()->setFrequency(freq);
 
@@ -159,11 +163,12 @@ bool Demodulator::setFrequency(long long freq) {
 	_demodMgr.getCurrentModem()->setFrequency(freq);
 	//this is totally arbitrary
 	//usleep(DEMOD_BUFFER_TIME);
+	events::publish(std::make_shared<events::GenericNumberEvent>("demod_frequency_set", freq));
 	std::this_thread::sleep_for(std::chrono::microseconds(app::system::getConfig().getDemodConfig().demodDelay));
 
 	_currentFreq = freq;
 
-
+	
 
 	return true;
 }
@@ -172,6 +177,7 @@ bool Demodulator::setTunerFrequency(long long freq){
     _cubic->setFrequency(freq);
 	_demodMgr.getCurrentModem()->setFrequency(freq);
     //usleep(200000);
+	events::publish(std::make_shared<events::GenericNumberEvent>("demod_frequency_set", freq));
 	std::this_thread::sleep_for(std::chrono::microseconds(app::system::getConfig().getDemodConfig().retuneDelay));
 	return true;
 }
@@ -290,7 +296,11 @@ void Demodulator::_handleRequest(ClientRequest& request){
 }
 
 void Demodulator::_contextUpdate(){
-	app::server::demodContextUpdate(piscan::server::context::DemodContext(_gain, _squelchLevel));
+	//app::server::demodContextUpdate(piscan::server::context::DemodContext(_gain, _squelchLevel));
+	events::DemodStateEvent event;
+	event.squelchState = _squelchLevel;
+	event.tunerGainState = _gain;
+	events::publish(std::make_shared<events::DemodStateEvent>(std::move(event)));
 }
 
 void Demodulator::setTunerGain(float gain){

src/util/CMakeLists.txt

@@ -1,4 +1,5 @@
 add_library(util
+	${CMAKE_CURRENT_SOURCE_DIR}/Thread.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/StateMachine.cpp
 )
 

src/util/Thread.cpp

@@ -0,0 +1,95 @@
+#include "Thread.h"
+#include "threadname.h"
+#include "loguru.hpp"
+
+namespace piscan {
+    ThreadBase::ThreadBase(std::string name) : name(name), _run(true) {
+    }
+
+    void ThreadBase::initialize() {
+        LOG_F(1, "Initializing");
+    }
+
+    void ThreadBase::deinitialize() {
+        LOG_F(1, "Deinitializing");
+    }
+
+    void ThreadBase::start() {
+        LOG_F(1, "Starting %s", name.c_str());
+        _run = true;
+
+        _thread = std::thread([this]() { (*this).run(); });
+    }
+
+    void ThreadBase::stop() {
+        LOG_F(1, "Stopping %s", name.c_str());
+        _run = false;
+    }
+
+    void ThreadBase::join() {
+        if (_thread.joinable()) {
+            _thread.join();
+        }
+    }
+
+    void ThreadBase::run() {
+        setThreadName(name.c_str());
+
+        initialize();
+        LOG_F(1, "Started");
+
+        while(isRunning()) {
+            main();
+        }
+
+        deinitialize();
+
+        LOG_F(1, "Stopped");
+    }
+
+    void WorkerThread::start() {
+        _stopping = false;
+        ThreadBase::start();
+    }
+
+    void WorkerThread::stop() {
+        ThreadBase::stop();
+        std::unique_lock<std::mutex> lock(_mtx);
+        _stopping = true;
+        _cv.notify_all();
+    }
+
+    void WorkerThread::run() {
+        setThreadName(name.c_str());
+
+        initialize();
+        LOG_F(1, "Started");
+
+        while (isRunning())
+        {
+            std::unique_lock<std::mutex> lock(_mtx);
+            while(!workAvailable && !_stopping) {
+                _cv.wait(lock);
+            }
+            if(workAvailable){
+                main();
+            }
+            else if(_stopping){
+                break;
+            }
+        }
+
+        deinitialize();
+        LOG_F(1, "Stopped");
+    }
+
+    bool ThreadBase::isRunning() {
+        return _run.load();
+    }
+
+    void WorkerThread::postWorkAvailable() {
+        std::unique_lock<std::mutex> lock(_mtx);
+        workAvailable = true;
+        _cv.notify_all();
+    }
+}

src/util/Thread.h

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <thread>
+#include <atomic>
+#include <mutex>
+#include <condition_variable>
+
+namespace piscan {
+
+class ThreadBase {
+public:
+    virtual ~ThreadBase() {};
+
+    virtual void initialize();
+    virtual void deinitialize();
+
+    virtual void start();
+    virtual void stop();
+
+    virtual void join();
+
+    const std::string name;
+
+protected:
+    ThreadBase(std::string name);
+
+    virtual void run();
+    virtual void main() = 0;
+    bool isRunning();
+    //Logger logger();
+
+private:
+    std::atomic_bool _run;
+
+    std::thread _thread;
+};
+
+class WorkerThread : public ThreadBase {
+public:
+    virtual void start();
+    virtual void stop();
+
+protected:
+    WorkerThread(std::string name) : ThreadBase(name) {};
+    virtual ~WorkerThread(){};
+
+    virtual void run();
+    virtual void main() = 0;
+
+    void postWorkAvailable();
+    bool workAvailable;
+private:
+    std::mutex _mtx;
+    std::condition_variable _cv;
+    
+    bool _stopping;
+};
+
+}

src/util/test/CMakeLists.txt

@@ -2,4 +2,5 @@ package_add_test(util_tests
     ${CMAKE_CURRENT_SOURCE_DIR}/IntervalTimer_test.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/StateMachine_test.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/synchronize_test.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/Thread_test.cpp
 )