Added a lot of tests for SimpleConfig
Refactored the SImpleConfig class a lot to make sure the behavior is always defined.
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935286fe1c
commit
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@ -1,62 +1,95 @@
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import json
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import ast
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import threading
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import os
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from util import user_dir, print_error, print_msg
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SYSTEM_CONFIG_PATH = "/etc/electrum.conf"
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config = None
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def get_config():
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global config
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return config
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def set_config(c):
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global config
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config = c
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class SimpleConfig:
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class SimpleConfig(object):
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"""
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The SimpleConfig class is responsible for handling operations involving
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configuration files. The constructor reads and stores the system and
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user configurations from electrum.conf into separate dictionaries within
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a SimpleConfig instance then reads the wallet file.
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"""
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def __init__(self, options={}):
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self.lock = threading.Lock()
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The SimpleConfig class is responsible for handling operations involving
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configuration files.
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There are 3 different sources of possible configuration values:
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1. Command line options.
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2. User configuration (in the user's config directory)
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3. System configuration (in /etc/)
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They are taken in order (1. overrides config options set in 2., that
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override config set in 3.)
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"""
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def __init__(self, options=None, read_system_config_function=None,
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read_user_config_function=None, read_user_dir_function=None):
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# This is the holder of actual options for the current user.
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self.current_options = {}
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# This lock needs to be acquired for updating and reading the config in
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# a thread-safe way.
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self.lock = threading.RLock()
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# The path for the config directory. This is set later by init_path()
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self.path = None
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if options is None:
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options = {} # Having a mutable as a default value is a bad idea.
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# The following two functions are there for dependency injection when
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# testing.
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if read_system_config_function is None:
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read_system_config_function = read_system_config
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if read_user_config_function is None:
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read_user_config_function = read_user_config
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if read_user_dir_function is None:
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self.user_dir = user_dir
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else:
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self.user_dir = read_user_dir_function
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# Save the command-line keys to make sure we don't override them.
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self.command_line_keys = options.keys()
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# Save the system config keys to make sure we don't override them.
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self.system_config_keys = []
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# system conf, readonly
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self.system_config = {}
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if options.get('portable') is not True:
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self.read_system_config()
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# system conf
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system_config = read_system_config_function()
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self.system_config_keys = system_config.keys()
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self.current_options.update(system_config)
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# command-line options
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self.options_config = options
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# update the current options with the command line options last (to
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# override both others).
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self.current_options.update(options)
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# init path
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self.init_path()
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# user conf, writeable
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self.user_config = {}
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self.read_user_config()
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set_config(self)
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# user config.
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self.user_config = read_user_config_function(self.path)
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# The user config is overwritten by the current config!
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self.user_config.update(self.current_options)
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self.current_options = self.user_config
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set_config(self) # Make a singleton instance of 'self'
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def init_path(self):
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# Read electrum path in the command line configuration
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self.path = self.options_config.get('electrum_path')
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# Read electrum path in the system configuration
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if self.path is None:
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self.path = self.system_config.get('electrum_path')
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self.path = self.current_options.get('electrum_path')
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# If not set, use the user's default data directory.
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if self.path is None:
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self.path = user_dir()
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self.path = self.user_dir()
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# Make directory if it does not yet exist.
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if not os.path.exists(self.path):
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@ -64,110 +97,32 @@ a SimpleConfig instance then reads the wallet file.
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print_error( "electrum directory", self.path)
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# portable wallet: use the same directory for wallet and headers file
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#if options.get('portable'):
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# self.wallet_config['blockchain_headers_path'] = os.path.dirname(self.path)
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def set_key(self, key, value, save = True):
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# find where a setting comes from and save it there
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if self.options_config.get(key) is not None:
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print "Warning: not changing '%s' because it was passed as a command-line option"%key
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if not self.is_modifiable(key):
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print "Warning: not changing key '%s' because it is not modifiable" \
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" (passed as command line option or defined in /etc/electrum.conf)"%key
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return
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elif self.system_config.get(key) is not None:
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if str(self.system_config[key]) != str(value):
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print "Warning: not changing '%s' because it was set in the system configuration"%key
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else:
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with self.lock:
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self.user_config[key] = value
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if save:
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self.save_user_config()
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with self.lock:
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self.user_config[key] = value
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self.current_options[key] = value
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if save:
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self.save_user_config()
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return
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def get(self, key, default=None):
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out = None
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# 1. command-line options always override everything
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if self.options_config.has_key(key) and self.options_config.get(key) is not None:
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out = self.options_config.get(key)
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# 2. user configuration
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elif self.user_config.has_key(key):
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out = self.user_config.get(key)
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# 2. system configuration
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elif self.system_config.has_key(key):
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out = self.system_config.get(key)
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if out is None and default is not None:
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out = default
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# try to fix the type
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if default is not None and type(out) != type(default):
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import ast
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try:
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out = ast.literal_eval(out)
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except Exception:
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print "type error for '%s': using default value"%key
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out = default
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with self.lock:
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out = self.current_options.get(key, default)
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return out
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def is_modifiable(self, key):
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"""Check if the config file is modifiable."""
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if self.options_config.has_key(key):
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if key in self.command_line_keys:
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return False
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elif self.user_config.has_key(key):
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return True
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elif self.system_config.has_key(key):
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if key in self.system_config_keys:
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return False
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else:
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return True
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def read_system_config(self):
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"""Parse and store the system config settings in electrum.conf into system_config[]."""
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name = '/etc/electrum.conf'
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if os.path.exists(name):
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try:
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import ConfigParser
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except ImportError:
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print "cannot parse electrum.conf. please install ConfigParser"
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return
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p = ConfigParser.ConfigParser()
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p.read(name)
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try:
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for k, v in p.items('client'):
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self.system_config[k] = v
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except ConfigParser.NoSectionError:
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pass
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def read_user_config(self):
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"""Parse and store the user config settings in electrum.conf into user_config[]."""
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if not self.path: return
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path = os.path.join(self.path, "config")
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if os.path.exists(path):
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try:
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with open(path, "r") as f:
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data = f.read()
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except IOError:
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return
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try:
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d = ast.literal_eval( data ) #parse raw data from reading wallet file
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except Exception:
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print_msg("Error: Cannot read config file.")
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return
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self.user_config = d
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return True
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def save_user_config(self):
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if not self.path: return
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@ -180,3 +135,41 @@ a SimpleConfig instance then reads the wallet file.
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if self.get('gui') != 'android':
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import stat
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os.chmod(path, stat.S_IREAD | stat.S_IWRITE)
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def read_system_config():
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"""Parse and return the system config settings in /etc/electrum.conf."""
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if os.path.exists(SYSTEM_CONFIG_PATH):
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try:
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import ConfigParser
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except ImportError:
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print "cannot parse electrum.conf. please install ConfigParser"
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return
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p = ConfigParser.ConfigParser()
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p.read(SYSTEM_CONFIG_PATH)
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result = {}
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try:
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for k, v in p.items('client'):
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result[k] = v
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except ConfigParser.NoSectionError:
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pass
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return result
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def read_user_config(path):
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"""Parse and store the user config settings in electrum.conf into user_config[]."""
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if not path: return
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config_path = os.path.join(path, "config")
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if os.path.exists(config_path):
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try:
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with open(config_path, "r") as f:
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data = f.read()
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except IOError:
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return
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try:
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d = ast.literal_eval( data ) #parse raw data from reading wallet file
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except Exception:
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print_msg("Error: Cannot read config file.")
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return
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return d
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@ -0,0 +1,107 @@
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import sys
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import unittest
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import tempfile
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import shutil
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from StringIO import StringIO
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from lib.simple_config import SimpleConfig
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class Test_SimpleConfig(unittest.TestCase):
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def setUp(self):
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super(Test_SimpleConfig, self).setUp()
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# make sure "read_user_config" and "user_dir" return a temporary directory.
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self.electrum_dir = tempfile.mkdtemp()
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# Do the same for the user dir to avoid overwriting the real configuration
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# for development machines with electrum installed :)
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self.user_dir = tempfile.mkdtemp()
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self.options = {"electrum_path": self.electrum_dir}
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self._saved_stdout = sys.stdout
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self._stdout_buffer = StringIO()
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sys.stdout = self._stdout_buffer
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def tearDown(self):
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super(Test_SimpleConfig, self).tearDown()
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# Remove the temporary directory after each test (to make sure we don't
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# pollute /tmp for nothing.
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shutil.rmtree(self.electrum_dir)
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shutil.rmtree(self.user_dir)
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# Restore the "real" stdout
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sys.stdout = self._saved_stdout
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def test_simple_config_command_line_overrides_everything(self):
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"""Options passed by command line override all other configuration
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sources"""
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fake_read_system = lambda : {"electrum_path": "a"}
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fake_read_user = lambda _: {"electrum_path": "b"}
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read_user_dir = lambda : self.user_dir
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config = SimpleConfig(options=self.options,
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read_system_config_function=fake_read_system,
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read_user_config_function=fake_read_user,
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read_user_dir_function=read_user_dir)
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self.assertEqual(self.options.get("electrum_path"),
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config.get("electrum_path"))
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def test_simple_config_system_config_overrides_user_config(self):
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"""Options passed in system config override user config."""
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fake_read_system = lambda : {"electrum_path": self.electrum_dir}
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fake_read_user = lambda _: {"electrum_path": "b"}
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read_user_dir = lambda : self.user_dir
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config = SimpleConfig(options=None,
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read_system_config_function=fake_read_system,
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read_user_config_function=fake_read_user,
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read_user_dir_function=read_user_dir)
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self.assertEqual(self.options.get("electrum_path"),
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config.get("electrum_path"))
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def test_simple_config_user_config_is_used_if_others_arent_specified(self):
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"""Options passed by command line override all other configuration
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sources"""
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fake_read_system = lambda : {}
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fake_read_user = lambda _: {"electrum_path": self.electrum_dir}
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read_user_dir = lambda : self.user_dir
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config = SimpleConfig(options=None,
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read_system_config_function=fake_read_system,
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read_user_config_function=fake_read_user,
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read_user_dir_function=read_user_dir)
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self.assertEqual(self.options.get("electrum_path"),
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config.get("electrum_path"))
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def test_cannot_set_options_passed_by_command_line(self):
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fake_read_system = lambda : {}
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fake_read_user = lambda _: {"electrum_path": "b"}
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read_user_dir = lambda : self.user_dir
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config = SimpleConfig(options=self.options,
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read_system_config_function=fake_read_system,
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read_user_config_function=fake_read_user,
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read_user_dir_function=read_user_dir)
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config.set_key("electrum_path", "c")
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self.assertEqual(self.options.get("electrum_path"),
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config.get("electrum_path"))
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def test_cannot_set_options_from_system_config(self):
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fake_read_system = lambda : {"electrum_path": self.electrum_dir}
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fake_read_user = lambda _: {}
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read_user_dir = lambda : self.user_dir
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config = SimpleConfig(options={},
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read_system_config_function=fake_read_system,
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read_user_config_function=fake_read_user,
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read_user_dir_function=read_user_dir)
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config.set_key("electrum_path", "c")
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self.assertEqual(self.options.get("electrum_path"),
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config.get("electrum_path"))
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def test_can_set_options_set_in_user_config(self):
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another_path = tempfile.mkdtemp()
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fake_read_system = lambda : {}
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fake_read_user = lambda _: {"electrum_path": self.electrum_dir}
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read_user_dir = lambda : self.user_dir
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config = SimpleConfig(options={},
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read_system_config_function=fake_read_system,
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read_user_config_function=fake_read_user,
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read_user_dir_function=read_user_dir)
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config.set_key("electrum_path", another_path)
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self.assertEqual(another_path, config.get("electrum_path"))
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