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306 lines
11 KiB
306 lines
11 KiB
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2015 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 controller & compute.
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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 configparser
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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 settings file)
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"""
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def __init__(self, files=None, profile=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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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 = "{}.{}".format(__version_info__[0], __version_info__[1])
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if sys.platform.startswith("win"):
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# On windows, the configuration file location can be one of the following:
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# 1: %APPDATA%/GNS3/gns3_server.ini
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# 2: %APPDATA%/GNS3.ini
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# 3: %COMMON_APPDATA%/GNS3/gns3_server.ini
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# 4: %COMMON_APPDATA%/GNS3.ini
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# 5: server.ini in the current working directory
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appdata = os.path.expandvars("%APPDATA%")
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common_appdata = os.path.expandvars("%COMMON_APPDATA%")
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if self._profile:
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legacy_user_dir = os.path.join(appdata, appname, "profiles", self._profile)
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versioned_user_dir = os.path.join(appdata, appname, version, "profiles", self._profile)
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else:
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legacy_user_dir = os.path.join(appdata, appname)
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versioned_user_dir = os.path.join(appdata, appname, version)
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server_filename = "gns3_server.ini"
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controller_filename = "gns3_controller.ini"
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# move gns3_controller.conf to gns3_controller.ini (file was renamed in 2.2.0 on Windows)
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old_controller_filename = os.path.join(legacy_user_dir, "gns3_controller.conf")
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if os.path.exists(old_controller_filename):
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try:
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shutil.copyfile(old_controller_filename, os.path.join(legacy_user_dir, controller_filename))
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except OSError as e:
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log.error("Cannot move old controller configuration file: {}".format(e))
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if self._files is None and not hasattr(sys, "_called_from_test"):
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self._files = [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(appdata, appname + ".ini"),
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os.path.join(common_appdata, appname, server_filename),
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os.path.join(common_appdata, appname + ".ini")]
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else:
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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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controller_filename = "gns3_controller.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 = [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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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 -> 2.3) + 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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# migrate the controller config file
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old_controller_config = os.path.join(legacy_user_dir, controller_filename)
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new_controller_config = os.path.join(versioned_user_dir, controller_filename)
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if not os.path.exists(new_controller_config) and os.path.exists(old_controller_config):
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shutil.copyfile(old_controller_config, os.path.join(versioned_user_dir, new_controller_config))
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except OSError as e:
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log.error("Cannot migrate old config files: {}".format(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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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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return os.path.dirname(self._main_config_file)
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@property
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def controller_config(self):
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if sys.platform.startswith("win"):
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controller_config_filename = "gns3_controller.ini"
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else:
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controller_config_filename = "gns3_controller.conf"
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return os.path.join(self.config_dir, controller_config_filename)
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def clear(self):
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"""Restart with a clean config"""
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self._config = configparser.RawConfigParser()
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# Override config from command line even if we modify the config file and live reload it.
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self._override_config = {}
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self.read_config()
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def _watch_config_file(self):
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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, path):
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self.read_config()
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for section in self._override_config:
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self.set_section_config(section, self._override_config[section])
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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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for section in self._override_config:
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self.set_section_config(section, self._override_config[section])
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def get_config_files(self):
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return self._watched_files
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def read_config(self):
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"""
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Read the configuration files.
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"""
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try:
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parsed_files = self._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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else:
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for file in parsed_files:
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log.info("Load configuration file {}".format(file))
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self._watched_files[file] = os.stat(file).st_mtime
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def get_default_section(self):
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"""
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Get the default configuration section.
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:returns: configparser section
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"""
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return self._config["DEFAULT"]
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def get_section_config(self, section):
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"""
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Get a specific configuration section.
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Returns the default section if none can be found.
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:returns: configparser section
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"""
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if section not in self._config:
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return self._config["DEFAULT"]
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return self._config[section]
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def set_section_config(self, section, content):
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"""
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Set a specific configuration section. It's not
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dumped on the disk.
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:param section: Section name
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:param content: A dictionary with section content
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"""
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if not self._config.has_section(section):
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self._config.add_section(section)
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for key in content:
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if isinstance(content[key], bool):
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content[key] = str(content[key]).lower()
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self._config.set(section, key, content[key])
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self._override_config[section] = content
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def set(self, section, key, value):
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"""
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Set a config value.
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It's not dumped on the disk.
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If the section doesn't exists the section is created
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"""
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conf = self.get_section_config(section)
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if isinstance(value, bool):
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conf[key] = str(value)
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else:
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conf[key] = value
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self.set_section_config(section, conf)
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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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