WordClockESP/lib/framework/SimpleService.h

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#ifndef Service_h
#define Service_h
#if defined(ESP8266)
#include <ESP8266WiFi.h>
#include <ESPAsyncTCP.h>
#elif defined(ESP_PLATFORM)
#include <WiFi.h>
#include <AsyncTCP.h>
#endif
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#include <ESPAsyncWebServer.h>
#include <ArduinoJson.h>
#include <AsyncJson.h>
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#include <AsyncJsonWebHandler.h>
#include <AsyncJsonCallbackResponse.h>
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/**
* At the moment, not expecting services to have to deal with large JSON
* files this could be made configurable fairly simply, it's exposed on
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* AsyncJsonWebHandler with a setter.
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*/
#define MAX_SETTINGS_SIZE 1024
/*
* Abstraction of a service which reads and writes data from an endpoint.
*
* Not currently used, but indended for use by features which do not
* require setting persistance.
*/
class SimpleService {
private:
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AsyncJsonWebHandler _updateHandler;
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void fetchConfig(AsyncWebServerRequest *request) {
AsyncJsonResponse * response = new AsyncJsonResponse(false, MAX_SETTINGS_SIZE);
JsonObject jsonObject = response->getRoot();
writeToJsonObject(jsonObject);
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response->setLength();
request->send(response);
}
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void updateConfig(AsyncWebServerRequest *request, JsonDocument &jsonDocument) {
if (jsonDocument.is<JsonObject>()) {
JsonObject newConfig = jsonDocument.as<JsonObject>();
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readFromJsonObject(newConfig);
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// write settings back with a callback to reconfigure the wifi
AsyncJsonCallbackResponse * response = new AsyncJsonCallbackResponse([this] () {onConfigUpdated();}, false, MAX_SETTINGS_SIZE);
JsonObject jsonObject = response->getRoot();
writeToJsonObject(jsonObject);
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response->setLength();
request->send(response);
} else {
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request->send(400);
}
}
protected:
// reads the local config from the
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virtual void readFromJsonObject(JsonObject& root) {}
virtual void writeToJsonObject(JsonObject& root) {}
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// implement to perform action when config has been updated
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virtual void onConfigUpdated() {}
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public:
SimpleService(AsyncWebServer* server, char const* servicePath) {
server->on(servicePath, HTTP_GET, std::bind(&SimpleService::fetchConfig, this, std::placeholders::_1));
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_updateHandler.setUri(servicePath);
_updateHandler.setMethod(HTTP_POST);
_updateHandler.setMaxContentLength(MAX_SETTINGS_SIZE);
_updateHandler.onRequest(std::bind(&SimpleService::updateConfig, this, std::placeholders::_1, std::placeholders::_2));
server->addHandler(&_updateHandler);
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}
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virtual ~SimpleService() {}
};
#endif // end SimpleService