Add interest rate option to config file

jmclient/jmclient/__init__.py

@@ -24,7 +24,7 @@ from .configure import (load_test_config, process_shutdown,
     load_program_config, jm_single, get_network, update_persist_config,
     validate_address, is_burn_destination, get_irc_mchannels,
     get_blockchain_interface_instance, set_config, is_segwit_mode,
-    is_native_segwit_mode, JMPluginService)
+    is_native_segwit_mode, JMPluginService, get_interest_rate)
 from .blockchaininterface import (BlockchainInterface,
                                   RegtestBitcoinCoreInterface, BitcoinCoreInterface)
 from .snicker_receiver import SNICKERError, SNICKERReceiver

jmclient/jmclient/configure.py

@@ -88,6 +88,8 @@ required_options = {'BLOCKCHAIN': ['blockchain_source', 'network'],
                     'POLICY': ['absurd_fee_per_kb', 'taker_utxo_retries',
                                'taker_utxo_age', 'taker_utxo_amtpercent']}
 
+_DEFAULT_INTEREST_RATE = "0.015"
+
 defaultconfig = \
     """
 [DAEMON]
@@ -291,6 +293,14 @@ minimum_makers = 4
 # whatever the value of it, and this is set with the value -1.
 max_sats_freeze_reuse = -1
 
+# Interest rate used when calculating the value of fidelity bonds created
+# by locking bitcoins in timelocked addresses
+# See also:
+# https://gist.github.com/chris-belcher/87ebbcbb639686057a389acb9ab3e25b#determining-interest-rate-r
+# Set as a real number, i.e. 1 = 100% and 0.01 = 1%
+interest_rate = """ + _DEFAULT_INTEREST_RATE + """
+
+
 ##############################
 #THE FOLLOWING SETTINGS ARE REQUIRED TO DEFEND AGAINST SNOOPERS.
 #DON'T ALTER THEM UNLESS YOU UNDERSTAND THE IMPLICATIONS.
@@ -538,6 +548,10 @@ _BURN_DESTINATION = "BURN"
 def is_burn_destination(destination):
     return destination == _BURN_DESTINATION
 
+def get_interest_rate():
+    return float(global_singleton.config.get('POLICY', 'interest_rate',
+        fallback=_DEFAULT_INTEREST_RATE))
+
 def remove_unwanted_default_settings(config):
     for section in config.sections():
         if section.startswith('MESSAGING:'):