def __init__(self):
# Instantiate Logger
self.LOGGER = Debug.getLogger("energyathome.datalogger.offlinehandler")
# Configuration Manager
self.CONFIG = ConfigManager()
# Data validation class
self.VALIDATOR = CheckLiveData()
# Data trigger class
self.TRIGGER = CheckLiveTriggers()
class BackupRestore:
def __init__(self):
# Instantiate Logger
self.LOGGER = Debug.getLogger("energyathome.datalogger.offlinehandler")
# Configuration Manager
self.CONFIG = ConfigManager()
# Data validation class
self.VALIDATOR = CheckLiveData()
# Data trigger class
self.TRIGGER = CheckLiveTriggers()
def backup(self, historicalData):
'''Writes historical data to file'''
#If true exit due to exception
exit = False
# Get file path from config
location = self.CONFIG.getConfig("Application", "offlineFile")
#Check if config is empty
if len(location) == 0:
# Use current directory
location = os.path.join(os.getcwd(), "backup.p")
self.LOGGER.warning("offlineFile is empty. Using default: '" + location + "'")
try:
# Append to file
path = file(location, "a")
# Ensure object has data
if historicalData is not None:
self.LOGGER.info("Writing data to file:" + str(historicalData.__dict__))
pickle.dump(historicalData, path)
except IOError:
#Debug.writeOut("Unable to write to backup file: '" + location + "'")
# No point running program if it's unable to write to file
exit = True
finally:
# Close file
try:
path.close()
except UnboundLocalError:
# File was not opened
pass
# Check to exit
if exit:
Core.shutdown()
def restore(self):
'''Starts the restore process from a file.'''
backup = self.restoreFromFile()
recordCount = len(backup)
if(recordCount > 0):
self.LOGGER.info(str(recordCount) + " record(s) found. Saving to DB")
for record in backup:
# Set data as valid by default
hDataValid = True
# Get backup record
hData = record
if self.VALIDATOR is not None and self.CONFIG.getBooleanConfig("Tolerence", "enabled"):
try:
validatedData = self.VALIDATOR.validateData(hData)
except Exception as e:
raise e
hDataValid = validatedData[0]
if hDataValid is True:
hData = validatedData[1]
if hDataValid and self.CONFIG.getBooleanConfig("Trigger", "enabled"):
# Check trigger conditions which return true or false if it's valid
try:
hDataValid = self.TRIGGER.checkTriggers(hData)
except Exception as e:
raise e
# Insert the first element in list and remove it
if hDataValid:
self.LOGGER.info("Inserting: " + str(record.__dict__))
#HistoricalData.insertData(record)
HistoricalData.insertData(hData)
else:
self.LOGGER.info("Skipped backup record")
# Remove backup file to prevent duplicate data from being restored.
self.LOGGER.info("Restore from backup complete.")
self.LOGGER.info("Removing backup file.")
self.LOGGER.info("File deleted? " + str(self.deleteBackupFile()))
def restoreFromFile(self):
'''Reads a file and returns an array of objects.'''
# List to store restored objects
list = []
# Get file path from config
location = self.CONFIG.getConfig("Application", "offlineFile")
#Check if config is empty
if len(location) == 0:
# Use current directory
location = os.path.join(os.getcwd(), "backup.p")
self.LOGGER.info("offlineFile is empty. Using default: '" + location + "'")
# Check file exists before deleting
if os.path.exists(location):
# Create file object
path = file(location, "r")
# Read file till end of file
try:
while True:
list.append(pickle.load(path))
except EOFError:
# Ignore end of file error
pass
finally:
# Close file
path.close()
self.LOGGER.info("Found " + str(len(list)) + " record(s) in '" + location + "'")
return list
def deleteBackupFile(self):
'''Removed backup file if it exists.'''
success = False;
# Get file path from config
location = self.CONFIG.getConfig("Application", "offlineFile")
#Check if config is empty
if len(location) == 0:
# Use current directory
location = os.path.join(os.getcwd(), "backup.p")
self.LOGGER.info("offlineFile is empty. Using default: '" + location + "'")
# Check file exists before deleting
if os.path.exists(location):
# Delete file
try:
os.remove(location)
success = True;
except OSError:
self.LOGGER.error("Unable to remove file: '" + location + "'")
return success;
