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RequestHandler.cpp
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RequestHandler.cpp
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/* Copyright (C) 2015 Willi Menapace <[email protected]>, Simone Lorengo - All Rights Reserved
* Unauthorized copying of this file, via any medium is strictly prohibited
* Proprietary and confidential
* Written by Willi Menapace <[email protected]>
*/
#include "RequestHandler.h"
#include "GlobalDefines.h"
#include "SecureFileReader.h"
#include "SecureFileWriter.h"
#include <assert.h>
const unsigned long RequestHandler::CONNECTION_RETRY_PERIOD = 120000;
const unsigned long RequestHandler::DEVICE_SEND_TIMEOUT = 5000;
const unsigned long RequestHandler::SETTINGS_UPDATE_TIMEOUT = 10000;
void RequestHandler::tryConnection() {
connector.tryConnection();
if(connector.isConnected()) {
netReader = connector.getReader();
netWriter = connector.getWriter();
}
}
bool RequestHandler::isConnected() {
return netReader != 0 && netWriter != 0 && netReader->isConnected() && netWriter->isConnected();
}
void RequestHandler::respondToAllRequests() {
while(netReader->isAvailable()) {
RequestProtocolConstants currentRequest = (RequestProtocolConstants) (netReader->readByte());
if(currentRequest == DEVICE_LIST_REQUEST) {
bool result = sendDeviceList();
//Ci sono stati errori durante l'invio
if(result == false) {
closeConnection();
return;
}
} else if(currentRequest == SETTINGS_UPDATE_REQUEST) {
bool result = updateSettings(); //Puo' provocare la caduta della connessione
//Ci sono stati errori
if(result == false) {
closeConnection();
return;
}
} else {
//Richiesta sconosciuta
assert(false);
}
//Se cade la connessione chiude tutte le risorse associate
if(!isConnected()) {
closeConnection();
return;
}
}
}
bool RequestHandler::sendDeviceList() {
SecureFileReader devicesReader;
devicesReader.open(DEVICES_FILENAME);
assert(isConnected());
unsigned long bytesToWrite = devicesReader.getSize();
unsigned long writtenBytes = 0;
//Invia la dimensione dei dati da ricevere al server
netWriter->writeLong(bytesToWrite);
while(devicesReader.isAvailable()) {
netWriter->writeByte(devicesReader.readByte());
++writtenBytes;
}
//Forza l'invio di tutti i byte del messaggio
netWriter->flush();
devicesReader.close();
assert(writtenBytes == bytesToWrite);
unsigned long sendTerminationTime = 0;
#ifdef ONBOARD
sendTerminationTime = millis();
#endif // ONBOARD
unsigned long currentTime = 0;
while(true) {
#ifdef ONBOARD
currentTime = millis();
#endif // ONBOARD
if(netReader->isAvailable()) {
RequestProtocolConstants response = (RequestProtocolConstants) netReader->readByte();
if(response == DEVICE_LIST_RECEIVED) {
return true;
} else {
//Se si riceve qualcosa deve essere una risposta positiva
assert(false);
}
}
//Se e' scaduto il timeout oppure se il contatore si e' resettato
if(currentTime - sendTerminationTime > DEVICE_SEND_TIMEOUT || currentTime < sendTerminationTime) {
return false;
}
if(!isConnected()) {
return false;
}
}
return true;
}
bool RequestHandler::updateSettings() {
SecureFileWriter settingsWriter;
settingsWriter.open(SETTINGS_FILENAME, false);
unsigned long receptionStartTime = 0;
unsigned long currentTime = 0;
#ifdef ONBOARD
receptionStartTime = millis();
currentTime = millis();
#endif // ONBOARD
bool sizeReceived = false;
unsigned long settingsSize = 0;
unsigned long receivedBytes = 0; //I byte di payload ricevuti (non sono inclusi i byte di dimensione del file)
//Finche' il timeout non scade e il contatore non viene resettato prova a ricevere il file
while(currentTime - receptionStartTime < SETTINGS_UPDATE_TIMEOUT && currentTime >= receptionStartTime) {
#ifdef ONBOARD
currentTime = millis();
#endif // ONBOARD
if(!isConnected()) {
return false;
}
while(netReader->isAvailable()) {
if(!sizeReceived) {
if(netReader->isAvailable() >= sizeof(unsigned long)) {
settingsSize = netReader->readLong();
sizeReceived = true;
}
} else {
settingsWriter.writeByte(netReader->readByte());
++receivedBytes;
//Se tutti i byte di settings sono stati ricevuti ferma la ricezione
if(receivedBytes == settingsSize) {
break;
}
}
}
if(receivedBytes == settingsSize) {
settingsWriter.close();
//Segnala l'avvenuta ricezione
netWriter->writeByte(SETTINGS_UPDATE_RECEIVED);
netWriter->flush();
//Carica le nuove impostazioni
SecureFileReader settingsReader;
settingsReader.open(SETTINGS_FILENAME);
//Ricarica le impostazioni
settings->initialize(&settingsReader);
settingsReader.close();
return true;
}
}
//Ci sono stati errori durante la ricezione quindi scarta i byte letti
settingsWriter.abort();
return false;
}
void RequestHandler::closeConnection() {
connector.closeConnection();
netReader = 0;
netWriter = 0;
}
void RequestHandler::processRequests() {
if(isConnected()) {
//La connessione con il server delle richieste e' presente
respondToAllRequests();
} else {
unsigned long currentTime = 0;
#ifdef ONBOARD
currentTime = millis();
#endif // ONBOARD
//E' passato il tempo di guardia o il contatore si e' resettato
if(currentTime - lastConnectionAttempt > CONNECTION_RETRY_PERIOD || currentTime < lastConnectionAttempt) {
//Ritenta la connessione con il server delle richiesete
tryConnection();
//Se la connessione ha successo
if(isConnected()) {
//La connessione con il server delle richieste e' presente
respondToAllRequests();
} else {
#ifdef ONBOARD
//Imposta la data dell'ultimo tentativo di connessione
lastConnectionAttempt = millis();
#endif // ONBOARD
}
}
}
}
RequestHandler::RequestHandler(Settings *_settings) : connector(_settings->getRequestServerParameters()) {
assert(_settings != 0);
netReader = 0;
netWriter = 0;
settings = _settings;
lastConnectionAttempt = 4294967294; //Forza il tentativo di connessione all'avvio
}