/usr/lib/python3/dist-packages/glances/client.py is in glances 2.7.1.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# This file is part of Glances.
#
# Copyright (C) 2015 Nicolargo <nicolas@nicolargo.com>
#
# Glances is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Glances is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Manage the Glances client."""
import json
import socket
import sys
from glances import __version__
from glances.compat import Fault, ProtocolError, ServerProxy, Transport
from glances.logger import logger
from glances.stats_client import GlancesStatsClient
from glances.outputs.glances_curses import GlancesCursesClient
class GlancesClientTransport(Transport):
"""This class overwrite the default XML-RPC transport and manage timeout."""
def set_timeout(self, timeout):
self.timeout = timeout
class GlancesClient(object):
"""This class creates and manages the TCP client."""
def __init__(self, config=None, args=None, timeout=7, return_to_browser=False):
# Store the arg/config
self.args = args
self.config = config
# Default client mode
self._client_mode = 'glances'
# Return to browser or exit
self.return_to_browser = return_to_browser
# Build the URI
if args.password != "":
self.uri = 'http://{}:{}@{}:{}'.format(args.username, args.password,
args.client, args.port)
else:
self.uri = 'http://{}:{}'.format(args.client, args.port)
logger.debug("Try to connect to {}".format(self.uri))
# Try to connect to the URI
transport = GlancesClientTransport()
# Configure the server timeout
transport.set_timeout(timeout)
try:
self.client = ServerProxy(self.uri, transport=transport)
except Exception as e:
self.log_and_exit("Client couldn't create socket {}: {}".format(self.uri, e))
def log_and_exit(self, msg=''):
"""Log and exit."""
if not self.return_to_browser:
logger.critical(msg)
sys.exit(2)
else:
logger.error(msg)
@property
def client_mode(self):
"""Get the client mode."""
return self._client_mode
@client_mode.setter
def client_mode(self, mode):
"""Set the client mode.
- 'glances' = Glances server (default)
- 'snmp' = SNMP (fallback)
"""
self._client_mode = mode
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':
# Check that both client and server are in the same major version
if __version__.split('.')[0] == client_version.split('.')[0]:
# Init stats
self.stats = GlancesStatsClient(config=self.config, args=self.args)
self.stats.set_plugins(json.loads(self.client.getAllPlugins()))
logger.debug("Client version: {} / Server version: {}".format(__version__, client_version))
else:
self.log_and_exit("Client and server not compatible: \
Client version: {} / Server version: {}".format(__version__, client_version))
return False
return True
def _login_snmp(self):
"""Login to a SNMP server"""
logger.info("Trying to grab stats by SNMP...")
from glances.stats_client_snmp import GlancesStatsClientSNMP
# Init stats
self.stats = GlancesStatsClientSNMP(config=self.config, args=self.args)
if not self.stats.check_snmp():
self.log_and_exit("Connection to SNMP server failed")
return False
return True
def login(self):
"""Logon to the server."""
if self.args.snmp_force:
# Force SNMP instead of Glances server
self.client_mode = 'snmp'
else:
# First of all, trying to connect to a Glances server
if not self._login_glances():
return False
# Try SNMP mode
if self.client_mode == 'snmp':
if not self._login_snmp():
return False
# Load limits from the configuration file
# Each client can choose its owns limits
logger.debug("Load limits from the client configuration file")
self.stats.load_limits(self.config)
# Init screen
self.screen = GlancesCursesClient(config=self.config, args=self.args)
# Return True: OK
return True
def update(self):
"""Update stats from Glances/SNMP server."""
if self.client_mode == 'glances':
return self.update_glances()
elif self.client_mode == 'snmp':
return self.update_snmp()
else:
self.end()
logger.critical("Unknown server mode: {}".format(self.client_mode))
sys.exit(2)
def update_glances(self):
"""Get stats from Glances server.
Return the client/server connection status:
- Connected: Connection OK
- Disconnected: Connection NOK
"""
# Update the stats
try:
server_stats = json.loads(self.client.getAll())
except socket.error:
# Client cannot get server stats
return "Disconnected"
except Fault:
# Client cannot get server stats (issue #375)
return "Disconnected"
else:
# Put it in the internal dict
self.stats.update(server_stats)
return "Connected"
def update_snmp(self):
"""Get stats from SNMP server.
Return the client/server connection status:
- SNMP: Connection with SNMP server OK
- Disconnected: Connection NOK
"""
# Update the stats
try:
self.stats.update()
except Exception:
# Client cannot get SNMP server stats
return "Disconnected"
else:
# Grab success
return "SNMP"
def serve_forever(self):
"""Main client loop."""
exitkey = False
try:
while True and not exitkey:
# Update the stats
cs_status = self.update()
# Update the screen
exitkey = self.screen.update(self.stats,
cs_status=cs_status,
return_to_browser=self.return_to_browser)
# Export stats using export modules
self.stats.export(self.stats)
except Exception as e:
logger.critical(e)
self.end()
return self.client_mode
def end(self):
"""End of the client session."""
self.screen.end()
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