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# This file is part of Glances. |
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# |
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# SPDX-FileCopyrightText: 2022 Nicolas Hennion <[email protected]> |
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# |
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# SPDX-License-Identifier: LGPL-3.0-only |
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# |
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"""Manage the Glances server.""" |
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import json |
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import socket |
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import sys |
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from base64 import b64decode |
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from glances import __version__ |
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from glances.autodiscover import GlancesAutoDiscoverClient |
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from glances.globals import SimpleXMLRPCRequestHandler, SimpleXMLRPCServer |
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from glances.logger import logger |
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from glances.stats_server import GlancesStatsServer |
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from glances.timer import Timer |
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class GlancesXMLRPCHandler(SimpleXMLRPCRequestHandler): |
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"""Main XML-RPC handler.""" |
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rpc_paths = ('/RPC2',) |
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def end_headers(self): |
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# Hack to add a specific header |
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# Thk to: https://gist.github.com/rca/4063325 |
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self.send_my_headers() |
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super().end_headers() |
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def send_my_headers(self): |
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# Specific header is here (solved the issue #227) |
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self.send_header("Access-Control-Allow-Origin", "*") |
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def authenticate(self, headers): |
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# auth = headers.get('Authorization') |
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try: |
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(basic, _, encoded) = headers.get('Authorization').partition(' ') |
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except Exception: |
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# Client did not ask for authentication |
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# If server need it then exit |
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return not self.server.isAuth |
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else: |
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# Client authentication |
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(basic, _, encoded) = headers.get('Authorization').partition(' ') |
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assert basic == 'Basic', 'Only basic authentication supported' |
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# Encoded portion of the header is a string |
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# Need to convert to byte-string |
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encoded_byte_string = encoded.encode() |
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# Decode base64 byte string to a decoded byte string |
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decoded_bytes = b64decode(encoded_byte_string) |
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# Convert from byte string to a regular string |
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decoded_string = decoded_bytes.decode() |
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# Get the username and password from the string |
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(username, _, password) = decoded_string.partition(':') |
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# Check that username and password match internal global dictionary |
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return self.check_user(username, password) |
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def check_user(self, username, password): |
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# Check username and password in the dictionary |
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if username in self.server.user_dict: |
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from glances.password import GlancesPassword |
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# TODO: config is not taken into account: it may be a problem ? |
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pwd = GlancesPassword(username=username, config=None) |
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return pwd.check_password(self.server.user_dict[username], password) |
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return False |
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def parse_request(self): |
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if SimpleXMLRPCRequestHandler.parse_request(self): |
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# Next we authenticate |
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if self.authenticate(self.headers): |
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return True |
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# if authentication fails, tell the client |
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self.send_error(401, 'Authentication failed') |
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return False |
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def log_message(self, log_format, *args): |
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# No message displayed on the server side |
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pass |
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class GlancesXMLRPCServer(SimpleXMLRPCServer): |
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"""Init a SimpleXMLRPCServer instance (IPv6-ready).""" |
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finished = False |
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def __init__(self, bind_address, bind_port=61209, requestHandler=GlancesXMLRPCHandler, config=None): |
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self.bind_address = bind_address |
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self.bind_port = bind_port |
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self.config = config |
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try: |
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self.address_family = socket.getaddrinfo(bind_address, bind_port)[0][0] |
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except OSError as e: |
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logger.error(f"Couldn't open socket: {e}") |
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sys.exit(1) |
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super().__init__((bind_address, bind_port), requestHandler) |
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def end(self): |
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"""Stop the server""" |
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self.server_close() |
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self.finished = True |
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def serve_forever(self): |
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"""Main loop""" |
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while not self.finished: |
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self.handle_request() |
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class GlancesInstance: |
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"""All the methods of this class are published as XML-RPC methods.""" |
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def __init__(self, config=None, args=None): |
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# Init stats |
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self.stats = GlancesStatsServer(config=config, args=args) |
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# Initial update |
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self.stats.update() |
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# cached_time is the minimum time interval between stats updates |
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# i.e. XML/RPC calls will not retrieve updated info until the time |
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# since last update is passed (will retrieve old cached info instead) |
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self.timer = Timer(0) |
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self.cached_time = args.cached_time |
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def __update__(self): |
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# Never update more than 1 time per cached_time |
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if self.timer.finished(): |
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self.stats.update() |
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self.timer = Timer(self.cached_time) |
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def init(self): |
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# Return the Glances version |
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return __version__ |
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def getAll(self): |
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# Update and return all the stats |
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self.__update__() |
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return json.dumps(self.stats.getAll()) |
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def getAllPlugins(self): |
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# Return the plugins list |
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return json.dumps(self.stats.getPluginsList()) |
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def getAllLimits(self): |
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# Return all the plugins limits |
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return json.dumps(self.stats.getAllLimitsAsDict()) |
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def getAllViews(self): |
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# Return all the plugins views |
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return json.dumps(self.stats.getAllViewsAsDict()) |
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def getPlugin(self, plugin): |
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# Update and return the plugin stat |
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self.__update__() |
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return json.dumps(self.stats.get_plugin(plugin).get_raw()) |
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def getPluginView(self, plugin): |
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# Update and return the plugin view |
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return json.dumps(self.stats.get_plugin(plugin).get_views()) |
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class GlancesServer: |
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"""This class creates and manages the TCP server.""" |
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def __init__(self, requestHandler=GlancesXMLRPCHandler, config=None, args=None): |
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# Args |
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self.args = args |
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# Init the XML RPC server |
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try: |
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self.server = GlancesXMLRPCServer(args.bind_address, args.port, requestHandler, config=config) |
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except Exception as e: |
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logger.critical(f"Cannot start Glances server: {e}") |
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sys.exit(2) |
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else: |
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print(f'Glances XML-RPC server is running on {args.bind_address}:{args.port}') |
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# The users dict |
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# username / password couple |
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# By default, no auth is needed |
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self.server.user_dict = {} |
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self.server.isAuth = False |
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# Register functions |
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self.server.register_introspection_functions() |
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self.server.register_instance(GlancesInstance(config, args)) |
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if not self.args.disable_autodiscover: |
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# Note: The Zeroconf service name will be based on the hostname |
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# Correct issue: Zeroconf problem with zeroconf service name #889 |
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logger.info('Autodiscover is enabled with service name {}'.format(socket.gethostname().split('.', 1)[0])) |
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self.autodiscover_client = GlancesAutoDiscoverClient(socket.gethostname().split('.', 1)[0], args) |
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else: |
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logger.info("Glances autodiscover announce is disabled") |
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def add_user(self, username, password): |
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"""Add an user to the dictionary.""" |
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self.server.user_dict[username] = password |
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self.server.isAuth = True |
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def serve_forever(self): |
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"""Call the main loop.""" |
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# Set the server login/password (if -P/--password tag) |
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if self.args.password != "": |
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self.add_user(self.args.username, self.args.password) |
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# Serve forever |
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self.server.serve_forever() |
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def end(self): |
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"""End of the Glances server session.""" |
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if not self.args.disable_autodiscover: |
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self.autodiscover_client.close() |
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self.server.end() |
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