mirror of
https://github.com/GNS3/gns3-server
synced 2024-12-24 15:58:08 +00:00
285 lines
9.0 KiB
Python
285 lines
9.0 KiB
Python
#
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# Copyright (C) 2021 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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Reads the configuration file and store the settings for the server.
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"""
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import sys
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import os
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import shutil
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import secrets
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import configparser
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from pydantic import ValidationError
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from .schemas import ServerConfig
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from .version import __version_info__
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from .utils.file_watcher import FileWatcher
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import logging
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log = logging.getLogger(__name__)
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class Config:
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"""
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Configuration file management using configparser.
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:param files: Array of configuration files (optional)
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:param profile: Profile settings (default use standard config file)
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"""
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def __init__(self, files=None, profile=None):
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self._settings = None
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self._files = files
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self._profile = profile
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if files and len(files):
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if not os.access(files[0], os.R_OK) or not os.path.isfile(files[0]):
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raise SystemExit(f"Unable to read configuration file: {files[0]}")
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directory_name = os.path.dirname(files[0])
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if not directory_name or directory_name == "":
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files[0] = os.path.dirname(os.path.abspath(files[0])) + os.path.sep + files[0]
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self._main_config_file = files[0]
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else:
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self._main_config_file = None
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# Monitor configuration files for changes
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self._watched_files = {}
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self._watch_callback = []
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appname = "GNS3"
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version = f"{__version_info__[0]}.{__version_info__[1]}"
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# On UNIX-like platforms, the configuration file location can be one of the following:
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# 1: $HOME/.config/GNS3/gns3_server.conf
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# 2: $HOME/.config/GNS3.conf
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# 3: /etc/xdg/GNS3/gns3_server.conf
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# 4: /etc/xdg/GNS3.conf
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# 5: gns3_server.conf in the current working directory
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home = os.path.expanduser("~")
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server_filename = "gns3_server.conf"
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if self._profile:
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legacy_user_dir = os.path.join(home, ".config", appname, "profiles", self._profile)
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versioned_user_dir = os.path.join(home, ".config", appname, version, "profiles", self._profile)
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else:
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legacy_user_dir = os.path.join(home, ".config", appname)
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versioned_user_dir = os.path.join(home, ".config", appname, version)
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if self._files is None and not hasattr(sys, "_called_from_test"):
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self._files = [
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os.path.join(os.getcwd(), server_filename),
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os.path.join(versioned_user_dir, server_filename),
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os.path.join(home, ".config", appname + ".conf"),
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os.path.join("/etc/gns3", server_filename),
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os.path.join("/etc/xdg", appname, server_filename),
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os.path.join("/etc/xdg", appname + ".conf"),
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]
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if self._files is None:
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self._files = []
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if self._main_config_file is None:
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# TODO: migrate versioned config file from a previous version of GNS3 (for instance 2.2 -> 3.0) + support profiles
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# migrate post version 2.2.0 config files if they exist
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os.makedirs(versioned_user_dir, exist_ok=True)
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try:
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# migrate the server config file
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old_server_config = os.path.join(legacy_user_dir, server_filename)
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new_server_config = os.path.join(versioned_user_dir, server_filename)
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if not os.path.exists(new_server_config) and os.path.exists(old_server_config):
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shutil.copyfile(old_server_config, new_server_config)
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except OSError as e:
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log.error(f"Cannot migrate old config files: {e}")
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self._main_config_file = os.path.join(versioned_user_dir, server_filename)
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for file in self._files:
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if os.path.exists(file):
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self._main_config_file = file
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break
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self.clear()
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self._watch_config_file()
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@property
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def settings(self) -> ServerConfig:
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"""
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Return the settings.
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"""
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return self._settings
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def listen_for_config_changes(self, callback):
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"""
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Call the callback when the configuration file change
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"""
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self._watch_callback.append(callback)
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@property
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def profile(self):
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"""
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Settings profile
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"""
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return self._profile
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@property
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def config_dir(self):
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"""
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Return the directory where the configuration file is located.
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"""
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return os.path.dirname(self._main_config_file)
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@property
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def controller_vars(self):
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"""
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Return the controller variables file path.
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"""
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controller_vars_filename = "gns3_controller.vars"
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return os.path.join(self.config_dir, controller_vars_filename)
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@property
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def server_config(self):
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"""
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Return the server configuration file path.
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"""
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server_config_filename = "gns3_server.conf"
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return os.path.join(self.config_dir, server_config_filename)
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def clear(self):
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"""
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Restart with a clean config
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"""
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self.read_config()
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def _watch_config_file(self):
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"""
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Add config files to be monitored for changes.
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"""
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for file in self._files:
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if os.path.exists(file):
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self._watched_files[file] = FileWatcher(file, self._config_file_change)
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def _config_file_change(self, file_path):
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"""
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Callback when a config file has been updated.
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"""
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log.info(f"'{file_path}' has been updated, reloading the config...")
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self.read_config()
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for callback in self._watch_callback:
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callback()
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def reload(self):
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"""
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Reload configuration
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"""
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self.read_config()
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def get_config_files(self):
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"""
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Return the config files in use.
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"""
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return self._watched_files
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def _load_jwt_secret_key(self):
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"""
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Load the JWT secret key.
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"""
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jwt_secret_key_path = os.path.join(self._settings.Server.secrets_dir, "gns3_jwt_secret_key")
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if not os.path.exists(jwt_secret_key_path):
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log.info(f"No JWT secret key configured, generating one in '{jwt_secret_key_path}'...")
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try:
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with open(jwt_secret_key_path, "w+", encoding="utf-8") as fd:
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fd.write(secrets.token_hex(32))
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except OSError as e:
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log.error(f"Could not create JWT secret key file '{jwt_secret_key_path}': {e}")
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try:
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with open(jwt_secret_key_path, encoding="utf-8") as fd:
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jwt_secret_key_content = fd.read()
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self._settings.Controller.jwt_secret_key = jwt_secret_key_content
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except OSError as e:
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log.error(f"Could not read JWT secret key file '{jwt_secret_key_path}': {e}")
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def _load_secret_files(self):
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"""
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Load the secret files.
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"""
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if not self._settings.Server.secrets_dir:
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self._settings.Server.secrets_dir = os.path.dirname(self.server_config)
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self._load_jwt_secret_key()
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def read_config(self):
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"""
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Read the configuration files and validate the settings.
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"""
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config = configparser.ConfigParser(interpolation=None)
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try:
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parsed_files = config.read(self._files, encoding="utf-8")
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except configparser.Error as e:
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log.error("Can't parse configuration file: %s", str(e))
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return
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if not parsed_files:
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log.warning("No configuration file could be found or read")
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self._settings = ServerConfig()
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return
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for file in parsed_files:
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log.info(f"Configuration file '{file}' loaded")
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self._watched_files[file] = os.stat(file).st_mtime
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try:
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self._settings = ServerConfig(**config._sections)
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except ValidationError as e:
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log.critical(f"Could not validate configuration file settings: {e}")
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raise
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self._load_secret_files()
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@staticmethod
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def instance(*args, **kwargs):
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"""
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Singleton to return only one instance of Config.
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:returns: instance of Config
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"""
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if not hasattr(Config, "_instance") or Config._instance is None:
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Config._instance = Config(*args, **kwargs)
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return Config._instance
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@staticmethod
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def reset():
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"""
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Reset singleton
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"""
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Config._instance = None
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