169 lines
6.7 KiB
Python
169 lines
6.7 KiB
Python
# Copyright (c) 2016, Neil Booth
|
|
#
|
|
# All rights reserved.
|
|
#
|
|
# See the file "LICENCE" for information about the copyright
|
|
# and warranty status of this software.
|
|
|
|
'''Class for handling environment configuration and defaults.'''
|
|
|
|
|
|
import re
|
|
import resource
|
|
from collections import namedtuple
|
|
from ipaddress import ip_address
|
|
|
|
from torba.server.coins import Coin
|
|
from torba.server.env_base import EnvBase
|
|
import torba.server.util as lib_util
|
|
|
|
|
|
NetIdentity = namedtuple('NetIdentity', 'host tcp_port ssl_port nick_suffix')
|
|
|
|
|
|
class Env(EnvBase):
|
|
'''Wraps environment configuration. Optionally, accepts a Coin class
|
|
as first argument to have ElectrumX serve custom coins not part of
|
|
the standard distribution.
|
|
'''
|
|
|
|
# Peer discovery
|
|
PD_OFF, PD_SELF, PD_ON = range(3)
|
|
|
|
def __init__(self, coin=None):
|
|
super().__init__()
|
|
self.obsolete(['UTXO_MB', 'HIST_MB', 'NETWORK'])
|
|
self.db_dir = self.required('DB_DIRECTORY')
|
|
self.db_engine = self.default('DB_ENGINE', 'leveldb')
|
|
self.daemon_url = self.required('DAEMON_URL')
|
|
if coin is not None:
|
|
assert issubclass(coin, Coin)
|
|
self.coin = coin
|
|
else:
|
|
coin_name = self.required('COIN').strip()
|
|
network = self.default('NET', 'mainnet').strip()
|
|
self.coin = Coin.lookup_coin_class(coin_name, network)
|
|
self.cache_MB = self.integer('CACHE_MB', 1200)
|
|
self.host = self.default('HOST', 'localhost')
|
|
self.reorg_limit = self.integer('REORG_LIMIT', self.coin.REORG_LIMIT)
|
|
# Server stuff
|
|
self.tcp_port = self.integer('TCP_PORT', None)
|
|
self.ssl_port = self.integer('SSL_PORT', None)
|
|
if self.ssl_port:
|
|
self.ssl_certfile = self.required('SSL_CERTFILE')
|
|
self.ssl_keyfile = self.required('SSL_KEYFILE')
|
|
self.rpc_port = self.integer('RPC_PORT', 8000)
|
|
self.max_subscriptions = self.integer('MAX_SUBSCRIPTIONS', 10000)
|
|
self.banner_file = self.default('BANNER_FILE', None)
|
|
self.tor_banner_file = self.default('TOR_BANNER_FILE',
|
|
self.banner_file)
|
|
self.anon_logs = self.boolean('ANON_LOGS', False)
|
|
self.log_sessions = self.integer('LOG_SESSIONS', 3600)
|
|
# Peer discovery
|
|
self.peer_discovery = self.peer_discovery_enum()
|
|
self.peer_announce = self.boolean('PEER_ANNOUNCE', True)
|
|
self.force_proxy = self.boolean('FORCE_PROXY', False)
|
|
self.tor_proxy_host = self.default('TOR_PROXY_HOST', 'localhost')
|
|
self.tor_proxy_port = self.integer('TOR_PROXY_PORT', None)
|
|
# The electrum client takes the empty string as unspecified
|
|
self.donation_address = self.default('DONATION_ADDRESS', '')
|
|
# Server limits to help prevent DoS
|
|
self.max_send = self.integer('MAX_SEND', 1000000)
|
|
self.max_subs = self.integer('MAX_SUBS', 250000)
|
|
self.max_sessions = self.sane_max_sessions()
|
|
self.max_session_subs = self.integer('MAX_SESSION_SUBS', 50000)
|
|
self.bandwidth_limit = self.integer('BANDWIDTH_LIMIT', 2000000)
|
|
self.session_timeout = self.integer('SESSION_TIMEOUT', 600)
|
|
self.drop_client = self.custom("DROP_CLIENT", None, re.compile)
|
|
|
|
# Identities
|
|
clearnet_identity = self.clearnet_identity()
|
|
tor_identity = self.tor_identity(clearnet_identity)
|
|
self.identities = [identity
|
|
for identity in (clearnet_identity, tor_identity)
|
|
if identity is not None]
|
|
|
|
def sane_max_sessions(self):
|
|
'''Return the maximum number of sessions to permit. Normally this
|
|
is MAX_SESSIONS. However, to prevent open file exhaustion, ajdust
|
|
downwards if running with a small open file rlimit.'''
|
|
env_value = self.integer('MAX_SESSIONS', 1000)
|
|
nofile_limit = resource.getrlimit(resource.RLIMIT_NOFILE)[0]
|
|
# We give the DB 250 files; allow ElectrumX 100 for itself
|
|
value = max(0, min(env_value, nofile_limit - 350))
|
|
if value < env_value:
|
|
self.logger.warning('lowered maximum sessions from {:,d} to {:,d} '
|
|
'because your open file limit is {:,d}'
|
|
.format(env_value, value, nofile_limit))
|
|
return value
|
|
|
|
def clearnet_identity(self):
|
|
host = self.default('REPORT_HOST', None)
|
|
if host is None:
|
|
return None
|
|
try:
|
|
ip = ip_address(host)
|
|
except ValueError:
|
|
bad = (not lib_util.is_valid_hostname(host)
|
|
or host.lower() == 'localhost')
|
|
else:
|
|
bad = (ip.is_multicast or ip.is_unspecified
|
|
or (ip.is_private and self.peer_announce))
|
|
if bad:
|
|
raise self.Error('"{}" is not a valid REPORT_HOST'.format(host))
|
|
tcp_port = self.integer('REPORT_TCP_PORT', self.tcp_port) or None
|
|
ssl_port = self.integer('REPORT_SSL_PORT', self.ssl_port) or None
|
|
if tcp_port == ssl_port:
|
|
raise self.Error('REPORT_TCP_PORT and REPORT_SSL_PORT '
|
|
'both resolve to {}'.format(tcp_port))
|
|
return NetIdentity(
|
|
host,
|
|
tcp_port,
|
|
ssl_port,
|
|
''
|
|
)
|
|
|
|
def tor_identity(self, clearnet):
|
|
host = self.default('REPORT_HOST_TOR', None)
|
|
if host is None:
|
|
return None
|
|
if not host.endswith('.onion'):
|
|
raise self.Error('tor host "{}" must end with ".onion"'
|
|
.format(host))
|
|
|
|
def port(port_kind):
|
|
'''Returns the clearnet identity port, if any and not zero,
|
|
otherwise the listening port.'''
|
|
result = 0
|
|
if clearnet:
|
|
result = getattr(clearnet, port_kind)
|
|
return result or getattr(self, port_kind)
|
|
|
|
tcp_port = self.integer('REPORT_TCP_PORT_TOR',
|
|
port('tcp_port')) or None
|
|
ssl_port = self.integer('REPORT_SSL_PORT_TOR',
|
|
port('ssl_port')) or None
|
|
if tcp_port == ssl_port:
|
|
raise self.Error('REPORT_TCP_PORT_TOR and REPORT_SSL_PORT_TOR '
|
|
'both resolve to {}'.format(tcp_port))
|
|
|
|
return NetIdentity(
|
|
host,
|
|
tcp_port,
|
|
ssl_port,
|
|
'_tor',
|
|
)
|
|
|
|
def hosts_dict(self):
|
|
return {identity.host: {'tcp_port': identity.tcp_port,
|
|
'ssl_port': identity.ssl_port}
|
|
for identity in self.identities}
|
|
|
|
def peer_discovery_enum(self):
|
|
pd = self.default('PEER_DISCOVERY', 'on').strip().lower()
|
|
if pd in ('off', ''):
|
|
return self.PD_OFF
|
|
elif pd == 'self':
|
|
return self.PD_SELF
|
|
else:
|
|
return self.PD_ON
|