309 lines
10 KiB
Python
309 lines
10 KiB
Python
import json
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import threading
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import time
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import os
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import stat
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from copy import deepcopy
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from .util import user_dir, print_error, print_stderr, PrintError
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from .bitcoin import MAX_FEE_RATE, FEE_TARGETS
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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(PrintError):
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"""
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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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fee_rates = [5000, 10000, 20000, 30000, 50000, 70000, 100000, 150000, 200000, 300000]
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def __init__(self, options={}, read_system_config_function=None,
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read_user_config_function=None, read_user_dir_function=None):
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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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self.fee_estimates = {}
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self.fee_estimates_last_updated = {}
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self.last_time_fee_estimates_requested = 0 # zero ensures immediate fees
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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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# The command line options
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self.cmdline_options = deepcopy(options)
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# Portable wallets don't use a system config
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if self.cmdline_options.get('portable', False):
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self.system_config = {}
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else:
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self.system_config = read_system_config_function()
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# Set self.path and read the user config
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self.user_config = {} # for self.get in electrum_path()
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self.path = self.electrum_path()
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self.user_config = read_user_config_function(self.path)
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# Upgrade obsolete keys
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self.fixup_keys({'auto_cycle': 'auto_connect'})
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# Make a singleton instance of 'self'
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set_config(self)
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def electrum_path(self):
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# Read electrum_path from command line / system configuration
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# Otherwise use the user's default data directory.
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path = self.get('electrum_path')
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if path is None:
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path = self.user_dir()
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if self.get('testnet'):
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path = os.path.join(path, 'testnet')
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# Make directory if it does not yet exist.
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if not os.path.exists(path):
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if os.path.islink(path):
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raise BaseException('Dangling link: ' + path)
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os.mkdir(path)
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os.chmod(path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)
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self.print_error("electrum directory", path)
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return path
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def fixup_config_keys(self, config, keypairs):
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updated = False
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for old_key, new_key in keypairs.items():
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if old_key in config:
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if not new_key in config:
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config[new_key] = config[old_key]
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del config[old_key]
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updated = True
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return updated
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def fixup_keys(self, keypairs):
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'''Migrate old key names to new ones'''
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self.fixup_config_keys(self.cmdline_options, keypairs)
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self.fixup_config_keys(self.system_config, keypairs)
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if self.fixup_config_keys(self.user_config, keypairs):
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self.save_user_config()
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def set_key(self, key, value, save = True):
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if not self.is_modifiable(key):
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print_stderr("Warning: not changing config key '%s' set on the command line" % key)
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return
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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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return
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def get(self, key, default=None):
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with self.lock:
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out = self.cmdline_options.get(key)
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if out is None:
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out = self.user_config.get(key)
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if out is None:
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out = self.system_config.get(key, default)
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return out
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def is_modifiable(self, key):
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return not key in self.cmdline_options
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def save_user_config(self):
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if not self.path:
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return
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path = os.path.join(self.path, "config")
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s = json.dumps(self.user_config, indent=4, sort_keys=True)
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with open(path, "w") as f:
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f.write(s)
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os.chmod(path, stat.S_IREAD | stat.S_IWRITE)
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def get_wallet_path(self):
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"""Set the path of the wallet."""
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# command line -w option
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if self.get('wallet_path'):
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return os.path.join(self.get('cwd'), self.get('wallet_path'))
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# path in config file
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path = self.get('default_wallet_path')
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if path and os.path.exists(path):
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return path
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# default path
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dirpath = os.path.join(self.path, "wallets")
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if not os.path.exists(dirpath):
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if os.path.islink(dirpath):
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raise BaseException('Dangling link: ' + dirpath)
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os.mkdir(dirpath)
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os.chmod(dirpath, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)
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new_path = os.path.join(self.path, "wallets", "default_wallet")
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# default path in pre 1.9 versions
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old_path = os.path.join(self.path, "electrum.dat")
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if os.path.exists(old_path) and not os.path.exists(new_path):
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os.rename(old_path, new_path)
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return new_path
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def remove_from_recently_open(self, filename):
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recent = self.get('recently_open', [])
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if filename in recent:
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recent.remove(filename)
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self.set_key('recently_open', recent)
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def set_session_timeout(self, seconds):
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self.print_error("session timeout -> %d seconds" % seconds)
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self.set_key('session_timeout', seconds)
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def get_session_timeout(self):
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return self.get('session_timeout', 300)
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def open_last_wallet(self):
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if self.get('wallet_path') is None:
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last_wallet = self.get('gui_last_wallet')
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if last_wallet is not None and os.path.exists(last_wallet):
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self.cmdline_options['default_wallet_path'] = last_wallet
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def save_last_wallet(self, wallet):
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if self.get('wallet_path') is None:
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path = wallet.storage.path
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self.set_key('gui_last_wallet', path)
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def max_fee_rate(self):
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f = self.get('max_fee_rate', MAX_FEE_RATE)
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if f==0:
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f = MAX_FEE_RATE
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return f
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def dynfee(self, i):
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if i < 4:
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j = FEE_TARGETS[i]
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fee = self.fee_estimates.get(j)
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else:
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assert i == 4
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fee = self.fee_estimates.get(2)
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if fee is not None:
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fee += fee/2
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if fee is not None:
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fee = min(5*MAX_FEE_RATE, fee)
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return fee
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def reverse_dynfee(self, fee_per_kb):
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import operator
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l = list(self.fee_estimates.items()) + [(1, self.dynfee(4))]
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dist = map(lambda x: (x[0], abs(x[1] - fee_per_kb)), l)
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min_target, min_value = min(dist, key=operator.itemgetter(1))
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if fee_per_kb < self.fee_estimates.get(25)/2:
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min_target = -1
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return min_target
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def static_fee(self, i):
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return self.fee_rates[i]
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def static_fee_index(self, value):
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dist = list(map(lambda x: abs(x - value), self.fee_rates))
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return min(range(len(dist)), key=dist.__getitem__)
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def has_fee_estimates(self):
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return len(self.fee_estimates)==4
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def is_dynfee(self):
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return self.get('dynamic_fees', True)
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def fee_per_kb(self):
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dyn = self.is_dynfee()
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if dyn:
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fee_rate = self.dynfee(self.get('fee_level', 2))
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else:
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fee_rate = self.get('fee_per_kb', self.max_fee_rate()/2)
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return fee_rate
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def update_fee_estimates(self, key, value):
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self.fee_estimates[key] = value
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self.fee_estimates_last_updated[key] = time.time()
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def is_fee_estimates_update_required(self):
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"""Checks time since last requested and updated fee estimates.
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Returns True if an update should be requested.
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"""
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now = time.time()
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prev_updates = self.fee_estimates_last_updated.values()
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oldest_fee_time = min(prev_updates) if prev_updates else 0
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stale_fees = now - oldest_fee_time > 7200
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old_request = now - self.last_time_fee_estimates_requested > 60
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return stale_fees and old_request
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def requested_fee_estimates(self):
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self.last_time_fee_estimates_requested = time.time()
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def get_video_device(self):
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device = self.get("video_device", "default")
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if device == 'default':
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device = ''
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return device
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def read_system_config(path=SYSTEM_CONFIG_PATH):
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"""Parse and return the system config settings in /etc/electrum.conf."""
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result = {}
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if os.path.exists(path):
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import configparser
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p = configparser.ConfigParser()
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try:
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p.read(path)
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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, configparser.MissingSectionHeaderError):
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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:
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return {}
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config_path = os.path.join(path, "config")
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if not os.path.exists(config_path):
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return {}
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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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result = json.loads(data)
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except:
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print_error("Warning: Cannot read config file.", config_path)
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return {}
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if not type(result) is dict:
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return {}
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return result
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