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device.hpp
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device.hpp
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#define REQUEST_BODY_KEY "message"
#define NEW_INPUT "new_input_added"
#define POP_INPUT "top_input_popped"
#include <cstdio>
#include <string>
#include <vector>
#include <memory>
#include <functional>
#include <queue>
#include <stack>
#include <atomic>
#include <thread>
#include <future>
#include "inputcontext.hpp"
#include "include/nlohmann/json.hpp"
#include "include/httplib/httplib.h"
class AppContext;
/**
* @brief AppContext Templated Types
*/
using AppContextDeleter = std::function<void(AppContext*)>;
using AppContextPtr = std::unique_ptr<AppContext, AppContextDeleter>;
/**
* @brief BaseInputContext Templated Types
*/
struct BaseInputContextDeleter {
void operator()(BaseInputContext * ptr) {
delete ptr;
}
};
using BaseInputContextPtr = std::unique_ptr<BaseInputContext, BaseInputContextDeleter>;
/**
* @brief Singleton application context
*/
class AppContext
{
/**
* @brief Static singleton instance, internally managed and exposed via `getInstance`
*/
static AppContextPtr instance;
/**
* @brief Priority queue used for storage of inputs with highest priority
*/
// using BaseInputContextRef = std::reference_wrapper<BaseInputContext>;
using BaseInputContextPtrVector = std::vector<BaseInputContextPtr>;
std::stack
<
BaseInputContextPtr//,
// BaseInputContextPtrVector,
// std::function<bool(const BaseInputContextPtr&, const BaseInputContextPtr&)>
> input_queue;
/**
* @brief Atomic bool to represent current status
*/
std::atomic_bool context_active;
/**
* @brief Sleep interval in milliseconds for async task
*/
unsigned int sleep_interval{16};
/**
* @brief JSON settings for multiple inputs
*
*/
nlohmann::json settings
{
{"UserManualInput", {}},
{"UserProgrammableInput", {}},
{"DisplayInput", {}},
{"MusicInput", {}},
{"WeatherInput", {}},
{"BrightnessInput", {}},
{"RandomInput", {}}
};
/**
* @brief Custom constructor
*/
AppContext()
:
// input_queue
// (
// [] (const BaseInputContextPtr& a, const BaseInputContextPtr& b) -> bool
// {
// return a->GetInputType() < b->GetInputType();
// }
// ),
context_active(false)
{}
/**
* @brief Default destructor
*/
~AppContext() = default;
public:
static AppContextPtr& getInstance()
{
if(!instance)
{
instance = AppContextPtr(
new AppContext(),
[] (AppContext* inst) -> void
{
printf("Deleted managed pointer instance in AppContext");
if(inst != nullptr)
{
delete inst;
}
}
);
}
return instance;
}
/**
* @brief Sends a request with metadata to a third party
*/
static void publishToThirdParty(std::string message)
{
nlohmann::json body;
body[REQUEST_BODY_KEY] = message;
std::cout << "Sending logs to third party..." << std::endl;
httplib::Client cli("http://cpp-httplib-server.yhirose.repl.co");
auto res = cli.Post("/post", body.dump(), "text/plain");
}
/**
* @brief Enqueue an item in to the priority queue, comparison done via custom functor
*/
void AddInput(BaseInputContextPtr&& input_ptr)
{
std::thread pushMetadataAdd(publishToThirdParty, NEW_INPUT);
pushMetadataAdd.detach();
input_queue.push(std::move(input_ptr));
}
/**
* @brief Peek the top of the queue
*/
const BaseInputContextPtr& TopQueue()
{
return input_queue.top();
}
/**
* @brief Pop the input on top
*/
void PopInput()
{
if (this->input_queue.empty())
{
return;
}
std::thread pushMetadataPop(publishToThirdParty, POP_INPUT);
pushMetadataPop.detach();
input_queue.pop();
}
/**
* @brief Process input - pass execution context to input context with highest priority
*/
void ProcessQueue()
{
if(this->input_queue.empty())
{
return;
}
const auto& input_processor = this->TopQueue();
auto [parameters, led_vector] = input_processor->Process();
this->PublishChangesToDevice(parameters, led_vector);
}
/**
* @brief Publish recently made changes to the controlled device
*
* @param parameters Structure of application parameters
* @param led_vector Array of LED vectors, internally managed by the input context
*/
void PublishChangesToDevice(const AppParameters& parameters, const std::vector<LEDContext>& led_vector) noexcept
{
/**
* @brief Dummy function, simulate publishing changes to device
*/
return;
}
/**
* @brief Start processing the inputs
*/
void StartProcessingInputs()
{
context_active.store(true);
std::thread input_lookup_t([] (AppContext * ptr) -> void
{
while(ptr->context_active.load())
{
ptr->ProcessQueue();
std::this_thread::sleep_for(std::chrono::milliseconds(ptr->sleep_interval));
}
}, this);
input_lookup_t.detach();
}
/**
* @brief Stop processing inputs
*/
void Stop()
{
context_active.store(false);
}
};
// Static instantiation
AppContextPtr AppContext::instance = nullptr;
BaseInputContextPtr buildContext(nlohmann::json requestJson, std::string requestType) {
AppParameters parameters("testing device name");
std::vector<LEDContext> tmpLedValues;
BaseInputContext * tmp = nullptr;
// No possible invalid type because of previous filtering....
if (requestType == "UserManualInput") {
/*
{ color: LEDContext (not array) }
*/
nlohmann::json& led = requestJson;
tmp = dynamic_cast<BaseInputContext*>(
new UserManualInputContext(
parameters,
UserManualData(
LEDContext(
led["intensity"],
RGB(led["r"], led["g"], led["b"]),
true
)
),
true
)
);
}
else if(requestType == "DisplayInput") {
/*
{ rgb: RGB }
*/
for (nlohmann::json& led: requestJson) {
tmpLedValues.push_back(
LEDContext(
led["intensity"],
RGB(led["r"], led["g"], led["b"]),
true
)
);
}
tmp = dynamic_cast<BaseInputContext*>(
new DisplayInputContext(
parameters, std::move(tmpLedValues), true
)
);
}
else if(requestType == "MusicInput") {
/*
{ frequency: double }
*/
std::vector<double> frequencyVector;
for (nlohmann::json& data: requestJson) {
frequencyVector.push_back(
(double) data["frequency"]
);
}
tmp = dynamic_cast<BaseInputContext*>(
new MusicInputContext(
parameters,
MusicData(std::move(frequencyVector)),
true
)
);
}
else if(requestType == "WeatherInput") {
/*
{ temperature: float }
*/
float temperature = requestJson["temperature"];
tmp = dynamic_cast<BaseInputContext*>(
new WeatherInputContext(
parameters,
WeatherData(temperature),
true
)
);
}
else if(requestType == "BrightnessInput") {
/*
{ intensity: unsigned char }
*/
std::vector<unsigned char> intensityVector;
for (nlohmann::json& data: requestJson) {
intensityVector.push_back(
(unsigned char) data["intensity"]
);
}
tmp = dynamic_cast<BaseInputContext*>(
new BrightnessInputContext(
parameters,
BrightnessData(std::move(intensityVector)),
true
)
);
}
else if(requestType == "RandomInput") {
/*
empty
*/
tmp = dynamic_cast<BaseInputContext*>(
new RandomInputContext(
parameters, true
)
);
}
BaseInputContextPtr smartPtr(tmp);
return smartPtr;
}