How to use the glances.logger.logger.error function in Glances

def _login_glances(self):
        """Login to a Glances server"""
        client_version = None
        try:
            client_version = self.client.init()
        except socket.error as err:
            # Fallback to SNMP
            self.client_mode = 'snmp'
            logger.error("Connection to Glances server failed ({} {})".format(err.errno, err.strerror))
            fallbackmsg = 'No Glances server found on {}. Trying fallback to SNMP...'.format(self.uri)
            if not self.return_to_browser:
                print(fallbackmsg)
            else:
                logger.info(fallbackmsg)
        except ProtocolError as err:
            # Other errors
            msg = "Connection to server {} failed".format(self.uri)
            if err.errcode == 401:
                msg += " (Bad username/password)"
            else:
                msg += " ({} {})".format(err.errcode, err.errmsg)
            self.log_and_exit(msg)
            return False

        if self.client_mode == 'glances':

def __init__(self, bind_address, bind_port=61209,
                 requestHandler=GlancesXMLRPCHandler):

        self.bind_address = bind_address
        self.bind_port = bind_port
        try:
            self.address_family = socket.getaddrinfo(bind_address, bind_port)[0][0]
        except socket.error as e:
            logger.error("Couldn't open socket: {}".format(e))
            sys.exit(1)

        super(GlancesXMLRPCServer, self).__init__((bind_address, bind_port), requestHandler)

def whitelisted(s,
                        whitelist=WHITELIST,
                        substitute=SUBSTITUTE):
            return ''.join(c if c in whitelist else substitute for c in s)

        for sensor, value in zip(columns, points):
            try:
                sensor = [whitelisted(name) for name in sensor.split('.')]
                tobeexport = [self.topic, self.hostname, name]
                tobeexport.extend(sensor)
                topic = '/'.join(tobeexport)

                self.client.publish(topic, value)
            except Exception as e:
                logger.error("Can not export stats to MQTT server (%s)" % e)

# Batinfo library (optional; Linux-only)
batinfo_tag = True
try:
    import batinfo
except ImportError:
    logger.debug("batinfo library not found. Fallback to psutil.")
    batinfo_tag = False

# Availability:
# Linux, Windows, FreeBSD (psutil>=5.1.0)
# macOS (psutil>=5.4.2)
psutil_tag = True
try:
    psutil.sensors_battery()
except Exception as e:
    logger.error("Cannot grab battery status {}.".format(e))
    psutil_tag = False


class Plugin(GlancesPlugin):
    """Glances battery capacity plugin.

    stats is a list
    """

    def __init__(self, args=None, config=None):
        """Init the plugin."""
        super(Plugin, self).__init__(args=args,
                                     config=config,
                                     stats_init_value=[])

        # Init the sensor class

fieldnames = iterkeys(all_stats[plugin])
                    csv_header += ('{}_{}'.format(plugin, fieldname)
                                   for fieldname in fieldnames)
                # Others lines: stats
                csv_data += itervalues(all_stats[plugin])

        # Export to CSV
        # Manage header
        if self.first_line:
            if self.old_header is None:
                # New file, write the header on top on the CSV file
                self.writer.writerow(csv_header)
            # File already exist, check if header are compatible
            if self.old_header != csv_header:
                # Header are differents, log an error and do not write data
                logger.error("Cannot append data to existing CSV file. Headers are differents.")
                logger.debug("Old header: {}".format(self.old_header))
                logger.debug("New header: {}".format(csv_header))
            else:
                # Header are equals, ready to write data
                self.old_header = None
            # Only do this once
            self.first_line = False
        # Manage data
        if self.old_header is None:
            self.writer.writerow(csv_data)
            self.csv_file.flush()

# for example, the file glances_xxx.py
        # generate self._plugins_list["xxx"] = ...
        name = plugin_script[len(self.header):-3].lower()
        try:
            # Import the plugin
            plugin = __import__(plugin_script[:-3])
            # Init and add the plugin to the dictionary
            if name in ('help', 'amps', 'ports'):
                self._plugins[name] = plugin.Plugin(args=args, config=config)
            else:
                self._plugins[name] = plugin.Plugin(args=args)
        except Exception as e:
            # If a plugin can not be log, display a critical message
            # on the console but do not crash
            logger.critical("Error while initializing the {} plugin ({})".format(name, e))
            logger.error(traceback.format_exc())

stats.extend(temperature)
            # Get the FAN speed
            try:
                fan_speed = self.__set_type(self.glancesgrabsensors.get('fan_speed'),
                                            'fan_speed')
            except Exception as e:
                logger.error("Cannot grab FAN speed (%s)" % e)
            else:
                # Append FAN speed
                stats.extend(fan_speed)
            # Update HDDtemp stats
            try:
                hddtemp = self.__set_type(self.hddtemp_plugin.update(),
                                          'temperature_hdd')
            except Exception as e:
                logger.error("Cannot grab HDD temperature (%s)" % e)
            else:
                # Append HDD temperature
                stats.extend(hddtemp)
            # Update batteries stats
            try:
                batpercent = self.__set_type(self.batpercent_plugin.update(),
                                             'battery')
            except Exception as e:
                logger.error("Cannot grab battery percent (%s)" % e)
            else:
                # Append Batteries %
                stats.extend(batpercent)

        elif self.input_method == 'snmp':
            # Update stats using SNMP
            # No standard:

except psutil.NoSuchProcess:
                            pass
                        except (psutil.AccessDenied, NotImplementedError):
                            # NotImplementedError: /proc/${PID}/smaps file doesn't exist
                            # on kernel < 2.6.14 or CONFIG_MMU kernel configuration option
                            # is not enabled (see psutil #533/glances #413).
                            extended['memory_swap'] = None
                    try:
                        extended['tcp'] = len(top_process.connections(kind="tcp"))
                        extended['udp'] = len(top_process.connections(kind="udp"))
                    except (psutil.AccessDenied, psutil.NoSuchProcess):
                        # Manage issue1283 (psutil.AccessDenied)
                        extended['tcp'] = None
                        extended['udp'] = None
                except (psutil.NoSuchProcess, ValueError, AttributeError) as e:
                    logger.error('Can not grab extended stats ({})'.format(e))
                    extended['extended_stats'] = False
                else:
                    logger.debug('Grab extended stats for process {}'.format(proc['pid']))
                    extended['extended_stats'] = True
                proc.update(extended)
            first = False
            # /End of extended stats

            # Time since last update (for disk_io rate computation)
            proc['time_since_update'] = time_since_update

            # Process status (only keep the first char)
            proc['status'] = str(proc['status'])[:1].upper()

            # Process IO
            # procstat['io_counters'] is a list:

if item is None:
            return self._json_dumps(s)

        if isinstance(s, dict):
            try:
                return self._json_dumps({item: s[item]})
            except KeyError as e:
                logger.error("Cannot get item history {} ({})".format(item, e))
                return None
        elif isinstance(s, list):
            try:
                # Source:
                # http://stackoverflow.com/questions/4573875/python-get-index-of-dictionary-item-in-list
                return self._json_dumps({item: map(itemgetter(item), s)})
            except (KeyError, ValueError) as e:
                logger.error("Cannot get item history {} ({})".format(item, e))
                return None
        else:
            return None