Finalize subscription to be a simple relay for now

Adding new object holding signals subscribed and afb event
that observes Signals using Reactive response observer design
pattern

Change-Id: I96647d36e0d27c25a399c1b3789621a803a845b6
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

8 files changed, 143 insertions, 89 deletions

diff --git a/signal-composer-binding/CMakeLists.txt b/signal-composer-binding/CMakeLists.txt
index 3d7130b..5255e21 100644
--- a/signal-composer-binding/CMakeLists.txt
+++ b/signal-composer-binding/CMakeLists.txt
@@ -21,7 +21,7 @@
 PROJECT_TARGET_ADD(signal-composer)
 
 	# Define project Targets
-	add_library(${TARGET_NAME} MODULE ${TARGET_NAME}-binding.cpp ${TARGET_NAME}.cpp source.cpp signal.cpp)
+	add_library(${TARGET_NAME} MODULE ${TARGET_NAME}-binding.cpp ${TARGET_NAME}.cpp source.cpp signal.cpp clientApp.cpp)
 
 	# Binder exposes a unique public entry point
 	SET_TARGET_PROPERTIES(${TARGET_NAME} PROPERTIES
diff --git a/signal-composer-binding/clientApp.cpp b/signal-composer-binding/clientApp.cpp
new file mode 100644
index 0000000..ce30163
--- /dev/null
+++ b/signal-composer-binding/clientApp.cpp
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+*/
+
+#include "clientApp.hpp"
+
+clientAppCtx::clientAppCtx(const char* uuid)
+: uuid_(uuid)
+{}
+
+void clientAppCtx::update(Signal* sig)
+{
+	json_object* sigJ = sig->toJSON();
+	if(afb_event_push(event_, sigJ) == 0)
+		{sig->delObserver(this);}
+	return;
+}
+
+void clientAppCtx::appendSignals(std::vector<Signal*>& sigV)
+{
+	bool set = false;
+	// Clean up already subscribed signals to avoid duplicata
+	for (std::vector<Signal*>::const_iterator it = sigV.begin();
+	it != sigV.end(); ++it)
+	{
+		for (auto& ctxSig: subscribedSignals_)
+			{if(*it == ctxSig) {set = true;}}
+		if (set)
+		{
+			set = false;
+			sigV.erase(it);
+			continue;
+		}
+		Signal* sig = *it;
+		sig->addObserver(this);
+	}
+
+	subscribedSignals_.insert(subscribedSignals_.end(), sigV.begin(), sigV.end());
+}
+
+int clientAppCtx::makeSubscription(struct afb_req request)
+{
+	event_ = afb_event_is_valid(event_) ?
+		event_ : afb_daemon_make_event(uuid_.c_str());
+	return afb_req_subscribe(request, event_);
+}
+
+int clientAppCtx::makeUnsubscription(struct afb_req request)
+{
+	return afb_event_is_valid(event_) ?
+		afb_req_unsubscribe(request, event_) : -1;
+}
diff --git a/signal-composer-binding/clientApp.hpp b/signal-composer-binding/clientApp.hpp
new file mode 100644
index 0000000..7e1bd9d
--- /dev/null
+++ b/signal-composer-binding/clientApp.hpp
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+*/
+#pragma once
+
+#include "signal-composer.hpp"
+
+class clientAppCtx: public Observer<Signal>
+{
+private:
+	std::string uuid_;
+	std::vector<Signal*> subscribedSignals_;
+	struct afb_event event_;
+public:
+	explicit clientAppCtx(const char* uuid);
+
+	void update(Signal* sig);
+	void appendSignals(std::vector<Signal*>& sigV);
+	int makeSubscription(struct afb_req request);
+	int makeUnsubscription(struct afb_req request);
+};
diff --git a/signal-composer-binding/signal-composer-binding.cpp b/signal-composer-binding/signal-composer-binding.cpp
index 9a32989..d4236a0 100644
--- a/signal-composer-binding/signal-composer-binding.cpp
+++ b/signal-composer-binding/signal-composer-binding.cpp
@@ -23,7 +23,7 @@
 
 #include "signal-composer-binding.hpp"
 #include "signal-composer-apidef.h"
-#include "signal-composer.hpp"
+#include "clientApp.hpp"
 
 /// @brief callback for receiving message from low bindings. This will callback
 /// an action defined in the configuration files depending on the event received
@@ -35,7 +35,7 @@ void onEvent(const char *event, json_object *object)
 	AFB_DEBUG("Received event json: %s", json_object_to_json_string(object));
 	Composer& composer = Composer::instance();
 
-	std::vector<std::shared_ptr<Signal>> signals = composer.searchSignals(event);
+	std::vector<Signal*> signals = composer.searchSignals(event);
 	if(!signals.empty())
 	{
 		for(auto& sig: signals)
@@ -49,34 +49,16 @@ static int one_subscribe_unsubscribe(struct afb_req request,
 	bool subscribe,
 	const std::string& event,
 	json_object* args,
-	clientAppCtxT* cContext)
+	clientAppCtx* cContext)
 {
 	int err = 0;
-	bool set = false;
-	std::vector<std::shared_ptr<Signal>> signals = Composer::instance().searchSignals(event);
+	std::vector<Signal*> signals = Composer::instance().searchSignals(event);
 
-	// Clean up already subscribed signals to avoid duplicata
-	for (std::vector<std::shared_ptr<Signal>>::const_iterator sig = signals.begin();
-		sig != signals.end(); ++sig)
-	{
-		for (auto& ctxSig: cContext->subscribedSignals)
-			{if(*sig == ctxSig) {set = true;}}
-		if (set) {signals.erase(sig);}
-	}
-
-	cContext->subscribedSignals.insert(cContext->subscribedSignals.end(), signals.begin(), signals.end());
-	cContext->event = afb_event_is_valid(cContext->event) ?
-		cContext->event : afb_daemon_make_event("Signal-Composer");
+	cContext->appendSignals(signals);
 	if(subscribe)
-	{
-		if(!afb_req_subscribe(request, cContext->event))
-			{Composer::instance().addSubscription(cContext);}
-	}
+		{err = cContext->makeSubscription(request);}
 	else
-	{
-		if(!afb_req_unsubscribe(request, cContext->event))
-			{Composer::instance().removeSubscription(cContext);}
-	}
+		{err = cContext->makeUnsubscription(request);}
 
 	return err;
 }
@@ -84,7 +66,7 @@ static int one_subscribe_unsubscribe(struct afb_req request,
 static int subscribe_unsubscribe(struct afb_req request,
 	bool subscribe,
 	json_object* args,
-	clientAppCtxT* cContext)
+	clientAppCtx* cContext)
 {
 	int rc = 0;
 	json_object *event = nullptr;
@@ -110,7 +92,7 @@ static int subscribe_unsubscribe(struct afb_req request,
 }
 
 /// @brief entry point for client subscription request.
-static void do_subscribe_unsubscribe(afb_req request, bool subscribe, clientAppCtxT* cContext)
+static void do_subscribe_unsubscribe(afb_req request, bool subscribe, clientAppCtx* cContext)
 {
 	int rc = 0;
 	json_object *oneArg = nullptr, *args = afb_req_json(request);
@@ -136,17 +118,17 @@ static void do_subscribe_unsubscribe(afb_req request, bool subscribe, clientAppC
 /// @brief entry point for client un-subscription request.
 void subscribe(afb_req request)
 {
-	clientAppCtxT *clientAppCtx = (clientAppCtxT*)afb_req_context_make(request, 0, Composer::createContext, Composer::destroyContext, nullptr);
+	clientAppCtx *cContext = reinterpret_cast<clientAppCtx*>(afb_req_context_make(request, 0, Composer::createContext, Composer::destroyContext, nullptr));
 
-	do_subscribe_unsubscribe(request, true, clientAppCtx);
+	do_subscribe_unsubscribe(request, true, cContext);
 }
 
 /// @brief entry point for client un-subscription request.
 void unsubscribe(afb_req request)
 {
-	clientAppCtxT *clientAppCtx = (clientAppCtxT*)afb_req_context_make(request, 0, Composer::createContext, Composer::destroyContext, nullptr);
+	clientAppCtx *cContext = reinterpret_cast<clientAppCtx*>(afb_req_context_make(request, 0, Composer::createContext, Composer::destroyContext, nullptr));
 
-	do_subscribe_unsubscribe(request, false, clientAppCtx);
+	do_subscribe_unsubscribe(request, false, cContext);
 }
 
 /// @brief verb that loads JSON configuration (old SigComp.json file now)
@@ -172,7 +154,7 @@ void list(afb_req request)
 {
 	struct json_object *allSignalsJ = json_object_new_array();
 
-	std::vector<std::shared_ptr<Signal>> allSignals = Composer::instance().getAllSignals();
+	std::vector<Signal*> allSignals = Composer::instance().getAllSignals();
 	for(auto& sig: allSignals)
 		{json_object_array_add(allSignalsJ, sig->toJSON());}
 
@@ -229,13 +211,13 @@ int execConf()
 	Composer& composer = Composer::instance();
 	int err = 0;
 	CtlConfigExec(composer.ctlConfig());
-	std::vector<std::shared_ptr<Signal>> allSignals = composer.getAllSignals();
+	std::vector<Signal*> allSignals = composer.getAllSignals();
 	ssize_t sigCount = allSignals.size();
-	for( std::shared_ptr<Signal>& sig: allSignals)
+	for( Signal*& sig: allSignals)
 	{
 		sig->attachToSourceSignals(composer);
 	}
-
+/*
 	for(auto& sig: allSignals)
 	{
 		if( (err += sig->recursionCheck()) )
@@ -244,7 +226,7 @@ int execConf()
 			return err;
 		}
 	}
-
+*/
 	composer.execSignalsSubscription();
 
 	AFB_DEBUG("Signal Composer Control configuration Done.\n signals=%d", (int)sigCount);
diff --git a/signal-composer-binding/signal-composer.cpp b/signal-composer-binding/signal-composer.cpp
index ba1b406..db35e76 100644
--- a/signal-composer-binding/signal-composer.cpp
+++ b/signal-composer-binding/signal-composer.cpp
@@ -19,11 +19,11 @@
 #include <string.h>
 #include <fnmatch.h>
 
-#include "signal-composer.hpp"
+#include "clientApp.hpp"
 
 extern "C" void setSignalValueHandle(const char* aName, long long int timestamp, struct SignalValue value)
 {
-	std::vector<std::shared_ptr<Signal>> signals = Composer::instance().searchSignals(aName);
+	std::vector<Signal*> signals = Composer::instance().searchSignals(aName);
 	if(!signals.empty())
 	{
 		for(auto& sig: signals)
@@ -328,7 +328,7 @@ int Composer::loadSignals(CtlSectionT* section, json_object *signalsJ)
 	return err;
 }
 
-void Composer::processOptions(const char** opts, std::shared_ptr<Signal> sig, json_object* response) const
+void Composer::processOptions(const char** opts, Signal* sig, json_object* response) const
 {
 	for(int idx=0; idx < sizeof(opts); idx++)
 	{
@@ -392,10 +392,8 @@ void* Composer::createContext(void* ctx)
 	uuid_t x;
 	char cuid[38];
 	uuid_generate(x);
-	ctx = (clientAppCtxT*)calloc(1, sizeof(clientAppCtxT));
-	clientAppCtxT* ret = (clientAppCtxT*) ctx;
 	uuid_unparse(x, cuid);
-	ret->event = afb_daemon_make_event(cuid);
+	clientAppCtx* ret = new clientAppCtx(cuid);
 
 	return (void*)ret;
 }
@@ -453,12 +451,12 @@ int Composer::initSourcesAPI()
 	return err;
 }
 
-std::vector<std::shared_ptr<Signal>> Composer::getAllSignals()
+std::vector<Signal*> Composer::getAllSignals()
 {
-	std::vector<std::shared_ptr<Signal>> allSignals;
+	std::vector<Signal*> allSignals;
 	for( auto& source : sourcesListV_)
 	{
-		std::vector<std::shared_ptr<Signal>> srcSignals = source.getSignals();
+		std::vector<Signal*> srcSignals = source.getSignals();
 		allSignals.insert(allSignals.end(), srcSignals.begin(), srcSignals.end());
 	}
 
@@ -475,10 +473,10 @@ SourceAPI* Composer::getSourceAPI(const std::string& api)
 	return nullptr;
 }
 
-std::vector<std::shared_ptr<Signal>> Composer::searchSignals(const std::string& aName)
+std::vector<Signal*> Composer::searchSignals(const std::string& aName)
 {
 	std::string api;
-	std::vector<std::shared_ptr<Signal>> signals;
+	std::vector<Signal*> signals;
 	size_t sep = aName.find_first_of("/");
 	if(sep != std::string::npos)
 	{
@@ -488,8 +486,8 @@ std::vector<std::shared_ptr<Signal>> Composer::searchSignals(const std::string&
 	}
 	else
 	{
-		std::vector<std::shared_ptr<Signal>> allSignals = getAllSignals();
-		for (std::shared_ptr<Signal>& sig : allSignals)
+		std::vector<Signal*> allSignals = getAllSignals();
+		for (Signal*& sig : allSignals)
 		{
 			if(*sig == aName)
 				{signals.emplace_back(sig);}
@@ -509,7 +507,7 @@ json_object* Composer::getSignalValue(const std::string& sig, json_object* optio
 		&opts[2],
 		&opts[3]);
 
-	std::vector<std::shared_ptr<Signal>> sigP = searchSignals(sig);
+	std::vector<Signal*> sigP = searchSignals(sig);
 	if(!sigP.empty())
 	{
 		for(auto& sig: sigP)
@@ -556,18 +554,3 @@ int Composer::execSignalsSubscription()
 	}
 	return err;
 }
-
-void Composer::addSubscription(clientAppCtxT* ctx)
-{
-	subscriptions_.push_back(ctx);
-}
-
-void Composer::removeSubscription(clientAppCtxT* ctx)
-{
-	for(std::vector<clientAppCtxT*>::const_iterator i = subscriptions_.begin();
-		i != subscriptions_.end(); ++i)
-	{
-		if(ctx == *i)
-			{subscriptions_.erase(i);}
-	}
-}
diff --git a/signal-composer-binding/signal-composer.hpp b/signal-composer-binding/signal-composer.hpp
index 95cbc68..2fd471c 100644
--- a/signal-composer-binding/signal-composer.hpp
+++ b/signal-composer-binding/signal-composer.hpp
@@ -16,18 +16,12 @@
 */
 #pragma once
 
-#include <memory>
+
 #include <vector>
 #include <string>
 
 #include "source.hpp"
 
-typedef struct clientAppCtxS
-{
-	std::vector<std::shared_ptr<Signal>> subscribedSignals;
-	struct afb_event event;
-} clientAppCtxT;
-
 class Composer
 {
 private:
@@ -35,7 +29,6 @@ private:
 
 	static CtlSectionT ctlSections_[]; ///< Config Section definition (note: controls section index should match handle retrieval in)
 	std::vector<SourceAPI> sourcesListV_;
-	std::vector<clientAppCtxT*> subscriptions_;
 
 	explicit Composer(const std::string& filepath);
 	Composer();
@@ -49,7 +42,7 @@ private:
 	int loadOneSignal(json_object* signalsJ);
 	static int loadSignals(CtlSectionT* section, json_object *signalsJ);
 
-	void processOptions(const char** opts, std::shared_ptr<Signal> sig, json_object* response) const;
+	void processOptions(const char** opts, Signal* sig, json_object* response) const;
 public:
 	static Composer& instance();
 	static void* createContext(void* ctx);
@@ -60,15 +53,12 @@ public:
 
 	CtlConfigT* ctlConfig();
 	int initSourcesAPI();
-	std::vector<std::shared_ptr<Signal>> getAllSignals();
+	std::vector<Signal*> getAllSignals();
 	SourceAPI* getSourceAPI(const std::string& api);
-	std::vector<std::shared_ptr<Signal>> searchSignals(const std::string& aName);
+	std::vector<Signal*> searchSignals(const std::string& aName);
 	json_object* getSignalValue(const std::string& sig, json_object* options);
 
 	int execSignalsSubscription();
-
-	void addSubscription(clientAppCtxT* ctx);
-	void removeSubscription(clientAppCtxT* ctx);
 };
 
 struct pluginCBT
diff --git a/signal-composer-binding/source.cpp b/signal-composer-binding/source.cpp
index d777515..f7dee11 100644
--- a/signal-composer-binding/source.cpp
+++ b/signal-composer-binding/source.cpp
@@ -44,14 +44,14 @@ std::string SourceAPI::api() const
 
 void SourceAPI::addSignal(const std::string& id, const std::string& event, std::vector<std::string>& depends, const std::string& sClass, const std::string& unit, double frequency, CtlActionT* onReceived, json_object* getSignalsArgs)
 {
-	std::shared_ptr<Signal> sig = std::make_shared<Signal>(id, event, depends, unit, frequency, onReceived, getSignalsArgs);
+	Signal* sig = new Signal(id, event, depends, unit, frequency, onReceived, getSignalsArgs);
 
 	signalsMap_[sig] = false;
 }
 
-std::vector<std::shared_ptr<Signal>> SourceAPI::getSignals() const
+std::vector<Signal*> SourceAPI::getSignals() const
 {
-	std::vector<std::shared_ptr<Signal>> signals;
+	std::vector<Signal*> signals;
 	for (auto& sig: signalsMap_)
 	{
 		signals.push_back(sig.first);
@@ -59,9 +59,9 @@ std::vector<std::shared_ptr<Signal>> SourceAPI::getSignals() const
 	return signals;
 }
 
-std::vector<std::shared_ptr<Signal>> SourceAPI::searchSignals(const std::string& name) const
+std::vector<Signal*> SourceAPI::searchSignals(const std::string& name) const
 {
-	std::vector<std::shared_ptr<Signal>> signals;
+	std::vector<Signal*> signals;
 	for (auto& sig: signalsMap_)
 	{
 		if(*sig.first == name)
diff --git a/signal-composer-binding/source.hpp b/signal-composer-binding/source.hpp
index 0885bf0..8b06b89 100644
--- a/signal-composer-binding/source.hpp
+++ b/signal-composer-binding/source.hpp
@@ -17,7 +17,7 @@
 
 #pragma once
 
-#include <memory>
+
 
 #include "signal.hpp"
 
@@ -28,7 +28,7 @@ private:
 	CtlActionT* init_;
 	CtlActionT* getSignals_;
 
-	std::map<std::shared_ptr<Signal>, bool> signalsMap_;
+	std::map<Signal*, bool> signalsMap_;
 
 public:
 	SourceAPI();
@@ -38,8 +38,8 @@ public:
 	std::string api() const;
 	void addSignal(const std::string& id, const std::string& event, std::vector<std::string>& sources, const std::string& sClass, const std::string& unit, double frequency, CtlActionT* onReceived, json_object* getSignalsArgs);
 
-	std::vector<std::shared_ptr<Signal>> getSignals() const;
-	std::vector<std::shared_ptr<Signal>> searchSignals(const std::string& name) const;
+	std::vector<Signal*> getSignals() const;
+	std::vector<Signal*> searchSignals(const std::string& name) const;
 
 	int makeSubscription();
 };