lib/simple_config.py

   1 import json
   2 import ast
   3 import threading
   4 import os
   5
   6 from util import user_dir, print_error, print_msg
   7
   8
   9 config = None
  10 def get_config():
  11     global config
  12     return config
  13
  14 def set_config(c):
  15     global config
  16     config = c
  17
  18
  19 class SimpleConfig:
  20     """
  21 The SimpleConfig class is responsible for handling operations involving
  22 configuration files.  The constructor reads and stores the system and
  23 user configurations from electrum.conf into separate dictionaries within
  24 a SimpleConfig instance then reads the wallet file.
  25 """
  26     def __init__(self, options={}):
  27         self.lock = threading.Lock()
  28
  29         # system conf, readonly
  30         self.system_config = {}
  31         if options.get('portable') is not True:
  32             self.read_system_config()
  33
  34         # command-line options
  35         self.options_config = options
  36
  37         # init path
  38         self.init_path()
  39
  40         # user conf, writeable
  41         self.user_config = {}
  42         self.read_user_config()
  43
  44         set_config(self)
  45
  46
  47
  48     def init_path(self):
  49
  50         # Read electrum path in the command line configuration
  51         self.path = self.options_config.get('electrum_path')
  52
  53         # Read electrum path in the system configuration
  54         if self.path is None:
  55             self.path = self.system_config.get('electrum_path')
  56
  57         # If not set, use the user's default data directory.
  58         if self.path is None:
  59             self.path = user_dir()
  60
  61         # Make directory if it does not yet exist.
  62         if not os.path.exists(self.path):
  63             os.mkdir(self.path)
  64
  65         print_error( "electrum directory", self.path)
  66
  67         # portable wallet: use the same directory for wallet and headers file
  68         #if options.get('portable'):
  69         #    self.wallet_config['blockchain_headers_path'] = os.path.dirname(self.path)
  70
  71     def set_key(self, key, value, save = True):
  72         # find where a setting comes from and save it there
  73         if self.options_config.get(key) is not None:
  74             print "Warning: not changing '%s' because it was passed as a command-line option"%key
  75             return
  76
  77         elif self.system_config.get(key) is not None:
  78             if str(self.system_config[key]) != str(value):
  79                 print "Warning: not changing '%s' because it was set in the system configuration"%key
  80
  81         else:
  82
  83             with self.lock:
  84                 self.user_config[key] = value
  85                 if save:
  86                     self.save_user_config()
  87
  88
  89
  90     def get(self, key, default=None):
  91
  92         out = None
  93
  94         # 1. command-line options always override everything
  95         if self.options_config.has_key(key) and self.options_config.get(key) is not None:
  96             out = self.options_config.get(key)
  97
  98         # 2. user configuration
  99         elif self.user_config.has_key(key):
 100             out = self.user_config.get(key)
 101
 102         # 2. system configuration
 103         elif self.system_config.has_key(key):
 104             out = self.system_config.get(key)
 105
 106         if out is None and default is not None:
 107             out = default
 108
 109         # try to fix the type
 110         if default is not None and type(out) != type(default):
 111             import ast
 112             try:
 113                 out = ast.literal_eval(out)
 114             except Exception:
 115                 print "type error for '%s': using default value"%key
 116                 out = default
 117
 118         return out
 119
 120
 121     def is_modifiable(self, key):
 122         """Check if the config file is modifiable."""
 123         if self.options_config.has_key(key):
 124             return False
 125         elif self.user_config.has_key(key):
 126             return True
 127         elif self.system_config.has_key(key):
 128             return False
 129         else:
 130             return True
 131
 132
 133     def read_system_config(self):
 134         """Parse and store the system config settings in electrum.conf into system_config[]."""
 135         name = '/etc/electrum.conf'
 136         if os.path.exists(name):
 137             try:
 138                 import ConfigParser
 139             except ImportError:
 140                 print "cannot parse electrum.conf. please install ConfigParser"
 141                 return
 142
 143             p = ConfigParser.ConfigParser()
 144             p.read(name)
 145             try:
 146                 for k, v in p.items('client'):
 147                     self.system_config[k] = v
 148             except ConfigParser.NoSectionError:
 149                 pass
 150
 151
 152     def read_user_config(self):
 153         """Parse and store the user config settings in electrum.conf into user_config[]."""
 154         if not self.path: return
 155
 156         path = os.path.join(self.path, "config")
 157         if os.path.exists(path):
 158             try:
 159                 with open(path, "r") as f:
 160                     data = f.read()
 161             except IOError:
 162                 return
 163             try:
 164                 d = ast.literal_eval( data )  #parse raw data from reading wallet file
 165             except Exception:
 166                 print_msg("Error: Cannot read config file.")
 167                 return
 168
 169             self.user_config = d
 170
 171
 172     def save_user_config(self):
 173         if not self.path: return
 174
 175         path = os.path.join(self.path, "config")
 176         s = repr(self.user_config)
 177         f = open(path,"w")
 178         f.write( s )
 179         f.close()
 180         if self.get('gui') != 'android':
 181             import stat
 182             os.chmod(path, stat.S_IREAD | stat.S_IWRITE)