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# -*- coding: utf-8 -*-
#
# 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.compat import Fault, ProtocolError, ServerProxy, Transport
from glances.globals import version
from glances.logger import logger
from glances.stats 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 != "":
uri = 'http://{0}:{1}@{2}:{3}'.format(args.username, args.password,
args.client, args.port)
else:
uri = 'http://{0}:{1}'.format(args.client, args.port)
logger.debug("Try to connect to {0}".format(uri))
# Try to connect to the URI
transport = GlancesClientTransport()
# Configure the server timeout
transport.set_timeout(timeout)
try:
self.client = ServerProxy(uri, transport=transport)
except Exception as e:
self.log_and_exit("Client couldn't create socket {0}: {1}".format(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(self):
"""Logon to the server."""
ret = True
if not self.args.snmp_force:
# First of all, trying to connect 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 ({0} {1})".format(err.errno, err.strerror))
fallbackmsg = 'No Glances server found. Trying fallback to SNMP...'
if not self.return_to_browser:
print(fallbackmsg)
else:
logger.info(fallbackmsg)
except ProtocolError as err:
# Other errors
msg = "Connection to server failed"
if err.errcode == 401:
msg += " (Bad username/password)"
else:
msg += " ({0} {1})".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: {0} / Server version: {1}".format(version, client_version))
else:
self.log_and_exit("Client and server not compatible: \
Client version: {0} / Server version: {1}".format(version, client_version))
return False
else:
self.client_mode = 'snmp'
# SNMP mode
if self.client_mode == 'snmp':
logger.info("Trying to grab stats by SNMP...")
from glances.stats 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
if ret:
# Load limits from the configuration file
# Each client can choose its owns limits
self.stats.load_limits(self.config)
# Init screen
self.screen = GlancesCursesClient(args=self.args)
# Return result
return ret
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: {0}".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())
server_stats['monitor'] = json.loads(self.client.getAllMonitored())
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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