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#!/usr/bin/env python
# Copyright (c) 2014 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
#
# Test fee estimation code
#
from test_framework import BitcoinTestFramework
from bitcoinrpc.authproxy import AuthServiceProxy, JSONRPCException
from util import *
class EstimateFeeTest(BitcoinTestFramework):
def setup_network(self):
self.nodes = []
self.nodes.append(start_node(0, self.options.tmpdir,
["-debug=mempool", "-debug=estimatefee"]))
# Node1 mines small-but-not-tiny blocks, and allows free transactions.
# NOTE: the CreateNewBlock code starts counting block size at 1,000 bytes,
# so blockmaxsize of 2,000 is really just 1,000 bytes (room enough for
# 6 or 7 transactions)
self.nodes.append(start_node(1, self.options.tmpdir,
["-blockprioritysize=1500", "-blockmaxsize=2000",
"-debug=mempool", "-debug=estimatefee"]))
connect_nodes(self.nodes[1], 0)
# Node2 is a stingy miner, that
# produces very small blocks (room for only 3 or so transactions)
node2args = [ "-blockprioritysize=0", "-blockmaxsize=1500",
"-debug=mempool", "-debug=estimatefee"]
self.nodes.append(start_node(2, self.options.tmpdir, node2args))
connect_nodes(self.nodes[2], 0)
self.is_network_split = False
self.sync_all()
def run_test(self):
# Prime the memory pool with pairs of transactions
# (high-priority, random fee and zero-priority, random fee)
min_fee = Decimal("0.001")
fees_per_kb = [];
for i in range(12):
(txid, txhex, fee) = random_zeropri_transaction(self.nodes, Decimal("1.1"),
min_fee, min_fee, 20)
tx_kbytes = (len(txhex)/2)/1000.0
fees_per_kb.append(float(fee)/tx_kbytes)
# Mine blocks with node2 until the memory pool clears:
count_start = self.nodes[2].getblockcount()
while len(self.nodes[2].getrawmempool()) > 0:
self.nodes[2].setgenerate(True, 1)
self.sync_all()
all_estimates = [ self.nodes[0].estimatefee(i) for i in range(1,20) ]
print("Fee estimates, super-stingy miner: "+str([str(e) for e in all_estimates]))
# Estimates should be within the bounds of what transactions fees actually were:
delta = 1.0e-6 # account for rounding error
for e in filter(lambda x: x >= 0, all_estimates):
if float(e)+delta < min(fees_per_kb) or float(e)-delta > max(fees_per_kb):
raise AssertionError("Estimated fee (%f) out of range (%f,%f)"%(float(e), min_fee_kb, max_fee_kb))
# Generate transactions while mining 30 more blocks, this time with node1:
for i in range(30):
for j in range(random.randrange(6-4,6+4)):
(txid, txhex, fee) = random_transaction(self.nodes, Decimal("1.1"),
Decimal("0.0"), min_fee, 20)
tx_kbytes = (len(txhex)/2)/1000.0
fees_per_kb.append(float(fee)/tx_kbytes)
self.nodes[1].setgenerate(True, 1)
self.sync_all()
all_estimates = [ self.nodes[0].estimatefee(i) for i in range(1,20) ]
print("Fee estimates, more generous miner: "+str([ str(e) for e in all_estimates]))
for e in filter(lambda x: x >= 0, all_estimates):
if float(e)+delta < min(fees_per_kb) or float(e)-delta > max(fees_per_kb):
raise AssertionError("Estimated fee (%f) out of range (%f,%f)"%(float(e), min_fee_kb, max_fee_kb))
# Finish by mining a normal-sized block:
while len(self.nodes[0].getrawmempool()) > 0:
self.nodes[0].setgenerate(True, 1)
self.sync_all()
final_estimates = [ self.nodes[0].estimatefee(i) for i in range(1,20) ]
print("Final fee estimates: "+str([ str(e) for e in final_estimates]))
if __name__ == '__main__':
EstimateFeeTest().main()
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