def upload(self, source_path, target_path=''):
        """Upload all files from given path to given bucket."""
        source_path = join(self.path, source_path)
        if target_path.find('/') == 0:
            target_path = target_path[1:]
        if target_path.find('/') == -1 or target_path.rfind('/') == len(target_path)-1:
            target_path = target_path+'/'
        bucket = self.get_bucket()
        if bucket:
            files = [f for f in listdir(source_path) if isfile(join(source_path, f))]
            for _file in files:
                self.verbose_print("Uploading: "+str(target_path)+str(_file))
                try:
                    data = open(source_path+'/'+str(_file), 'rb')
                    bucket.put_object(Key=str(target_path)+str(_file), Body=data)
                except Exception as e:
                    print("Error during upload of "+str(target_path)+str(_file)+": "+str(e))
                    return False
            return True