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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
#
# SPDX-License-Identifier: LGPL-3.0-only
#
"""Manage the Glances client browser (list of Glances server)."""
import ujson
import socket
import threading
from glances.compat import Fault, ProtocolError, ServerProxy
from glances.client import GlancesClient, GlancesClientTransport
from glances.logger import logger, LOG_FILENAME
from glances.password_list import GlancesPasswordList as GlancesPassword
from glances.static_list import GlancesStaticServer
from glances.autodiscover import GlancesAutoDiscoverServer
from glances.outputs.glances_curses_browser import GlancesCursesBrowser
class GlancesClientBrowser(object):
"""This class creates and manages the TCP client browser (servers list)."""
def __init__(self, config=None, args=None):
# Store the arg/config
self.args = args
self.config = config
self.static_server = None
self.password = None
# Load the configuration file
self.load()
# Start the autodiscover mode (Zeroconf listener)
if not self.args.disable_autodiscover:
self.autodiscover_server = GlancesAutoDiscoverServer()
else:
self.autodiscover_server = None
# Init screen
self.screen = GlancesCursesBrowser(args=self.args)
def load(self):
"""Load server and password list from the configuration file."""
# Init the static server list (if defined)
self.static_server = GlancesStaticServer(config=self.config)
# Init the password list (if defined)
self.password = GlancesPassword(config=self.config)
def get_servers_list(self):
"""Return the current server list (list of dict).
Merge of static + autodiscover servers list.
"""
ret = []
if self.args.browser:
ret = self.static_server.get_servers_list()
if self.autodiscover_server is not None:
ret = self.static_server.get_servers_list() + self.autodiscover_server.get_servers_list()
return ret
def __get_uri(self, server):
"""Return the URI for the given server dict."""
# Select the connection mode (with or without password)
if server['password'] != "":
if server['status'] == 'PROTECTED':
# Try with the preconfigure password (only if status is PROTECTED)
clear_password = self.password.get_password(server['name'])
if clear_password is not None:
server['password'] = self.password.sha256_hash(clear_password)
return 'http://{}:{}@{}:{}'.format(server['username'], server['password'], server['ip'], server['port'])
else:
return 'http://{}:{}'.format(server['ip'], server['port'])
def __update_stats(self, server):
"""Update stats for the given server (picked from the server list)"""
# Get the server URI
uri = self.__get_uri(server)
# Try to connect to the server
t = GlancesClientTransport()
t.set_timeout(3)
# Get common stats
try:
s = ServerProxy(uri, transport=t)
except Exception as e:
logger.warning("Client browser couldn't create socket {}: {}".format(uri, e))
else:
# Mandatory stats
try:
# CPU%
cpu_percent = 100 - ujson.loads(s.getCpu())['idle']
server['cpu_percent'] = '{:.1f}'.format(cpu_percent)
# MEM%
server['mem_percent'] = ujson.loads(s.getMem())['percent']
# OS (Human Readable name)
server['hr_name'] = ujson.loads(s.getSystem())['hr_name']
except (socket.error, Fault, KeyError) as e:
logger.debug("Error while grabbing stats form {}: {}".format(uri, e))
server['status'] = 'OFFLINE'
except ProtocolError as e:
if e.errcode == 401:
# Error 401 (Authentication failed)
# Password is not the good one...
server['password'] = None
server['status'] = 'PROTECTED'
else:
server['status'] = 'OFFLINE'
logger.debug("Cannot grab stats from {} ({} {})".format(uri, e.errcode, e.errmsg))
else:
# Status
server['status'] = 'ONLINE'
# Optional stats (load is not available on Windows OS)
try:
# LOAD
load_min5 = ujson.loads(s.getLoad())['min5']
server['load_min5'] = '{:.2f}'.format(load_min5)
except Exception as e:
logger.warning("Error while grabbing stats form {}: {}".format(uri, e))
return server
def __display_server(self, server):
"""Connect and display the given server"""
# Display the Glances client for the selected server
logger.debug("Selected server {}".format(server))
# Connection can take time
# Display a popup
self.screen.display_popup('Connect to {}:{}'.format(server['name'], server['port']), duration=1)
# A password is needed to access to the server's stats
if server['password'] is None:
# First of all, check if a password is available in the [passwords] section
clear_password = self.password.get_password(server['name'])
if clear_password is None or self.get_servers_list()[self.screen.active_server]['status'] == 'PROTECTED':
# Else, the password should be enter by the user
# Display a popup to enter password
clear_password = self.screen.display_popup(
'Password needed for {}: '.format(server['name']), is_input=True
)
# Store the password for the selected server
if clear_password is not None:
self.set_in_selected('password', self.password.sha256_hash(clear_password))
# Display the Glance client on the selected server
logger.info("Connect Glances client to the {} server".format(server['key']))
# Init the client
args_server = self.args
# Overwrite connection setting
args_server.client = server['ip']
args_server.port = server['port']
args_server.username = server['username']
args_server.password = server['password']
client = GlancesClient(config=self.config, args=args_server, return_to_browser=True)
# Test if client and server are in the same major version
if not client.login():
self.screen.display_popup(
"Sorry, cannot connect to '{}'\n" "See '{}' for more details".format(server['name'], LOG_FILENAME)
)
# Set the ONLINE status for the selected server
self.set_in_selected('status', 'OFFLINE')
else:
# Start the client loop
# Return connection type: 'glances' or 'snmp'
connection_type = client.serve_forever()
try:
logger.debug("Disconnect Glances client from the {} server".format(server['key']))
except IndexError:
# Server did not exist anymore
pass
else:
# Set the ONLINE status for the selected server
if connection_type == 'snmp':
self.set_in_selected('status', 'SNMP')
else:
self.set_in_selected('status', 'ONLINE')
# Return to the browser (no server selected)
self.screen.active_server = None
def __serve_forever(self):
"""Main client loop."""
# No need to update the server list
# It's done by the GlancesAutoDiscoverListener class (autodiscover.py)
# Or define statically in the configuration file (module static_list.py)
# For each server in the list, grab elementary stats (CPU, LOAD, MEM, OS...)
thread_list = {}
while not self.screen.is_end:
logger.debug("Iter through the following server list: {}".format(self.get_servers_list()))
for v in self.get_servers_list():
key = v["key"]
thread = thread_list.get(key, None)
if thread is None or thread.is_alive() is False:
thread = threading.Thread(target=self.__update_stats, args=[v])
thread_list[key] = thread
thread.start()
# Update the screen (list or Glances client)
if self.screen.active_server is None:
# Display the Glances browser
self.screen.update(self.get_servers_list())
else:
# Display the active server
self.__display_server(self.get_servers_list()[self.screen.active_server])
# exit key pressed
for thread in thread_list.values():
thread.join()
def serve_forever(self):
"""Wrapper to the serve_forever function.
This function will restore the terminal to a sane state
before re-raising the exception and generating a traceback.
"""
try:
return self.__serve_forever()
finally:
self.end()
def set_in_selected(self, key, value):
"""Set the (key, value) for the selected server in the list."""
# Static list then dynamic one
if self.screen.active_server >= len(self.static_server.get_servers_list()):
self.autodiscover_server.set_server(
self.screen.active_server - len(self.static_server.get_servers_list()), key, value
)
else:
self.static_server.set_server(self.screen.active_server, key, value)
def end(self):
"""End of the client browser session."""
self.screen.end()