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-rwxr-xr-xtest/rpc-tests/preciousblock.py115
1 files changed, 115 insertions, 0 deletions
diff --git a/test/rpc-tests/preciousblock.py b/test/rpc-tests/preciousblock.py
new file mode 100755
index 0000000000..30b0b5a301
--- /dev/null
+++ b/test/rpc-tests/preciousblock.py
@@ -0,0 +1,115 @@
+#!/usr/bin/env python3
+# Copyright (c) 2015-2016 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 the preciousblock RPC."""
+
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import (
+ assert_equal,
+ connect_nodes_bi,
+ sync_chain,
+ sync_blocks,
+)
+
+def unidirectional_node_sync_via_rpc(node_src, node_dest):
+ blocks_to_copy = []
+ blockhash = node_src.getbestblockhash()
+ while True:
+ try:
+ assert(len(node_dest.getblock(blockhash, False)) > 0)
+ break
+ except:
+ blocks_to_copy.append(blockhash)
+ blockhash = node_src.getblockheader(blockhash, True)['previousblockhash']
+ blocks_to_copy.reverse()
+ for blockhash in blocks_to_copy:
+ blockdata = node_src.getblock(blockhash, False)
+ assert(node_dest.submitblock(blockdata) in (None, 'inconclusive'))
+
+def node_sync_via_rpc(nodes):
+ for node_src in nodes:
+ for node_dest in nodes:
+ if node_src is node_dest:
+ continue
+ unidirectional_node_sync_via_rpc(node_src, node_dest)
+
+class PreciousTest(BitcoinTestFramework):
+ def __init__(self):
+ super().__init__()
+ self.setup_clean_chain = True
+ self.num_nodes = 3
+
+ def setup_network(self):
+ self.nodes = self.setup_nodes()
+
+ def run_test(self):
+ self.log.info("Ensure submitblock can in principle reorg to a competing chain")
+ self.nodes[0].generate(1)
+ assert_equal(self.nodes[0].getblockcount(), 1)
+ (hashY, hashZ) = self.nodes[1].generate(2)
+ assert_equal(self.nodes[1].getblockcount(), 2)
+ node_sync_via_rpc(self.nodes[0:3])
+ assert_equal(self.nodes[0].getbestblockhash(), hashZ)
+
+ self.log.info("Mine blocks A-B-C on Node 0")
+ (hashA, hashB, hashC) = self.nodes[0].generate(3)
+ assert_equal(self.nodes[0].getblockcount(), 5)
+ self.log.info("Mine competing blocks E-F-G on Node 1")
+ (hashE, hashF, hashG) = self.nodes[1].generate(3)
+ assert_equal(self.nodes[1].getblockcount(), 5)
+ assert(hashC != hashG)
+ self.log.info("Connect nodes and check no reorg occurs")
+ # Submit competing blocks via RPC so any reorg should occur before we proceed (no way to wait on inaction for p2p sync)
+ node_sync_via_rpc(self.nodes[0:2])
+ connect_nodes_bi(self.nodes,0,1)
+ assert_equal(self.nodes[0].getbestblockhash(), hashC)
+ assert_equal(self.nodes[1].getbestblockhash(), hashG)
+ self.log.info("Make Node0 prefer block G")
+ self.nodes[0].preciousblock(hashG)
+ assert_equal(self.nodes[0].getbestblockhash(), hashG)
+ self.log.info("Make Node0 prefer block C again")
+ self.nodes[0].preciousblock(hashC)
+ assert_equal(self.nodes[0].getbestblockhash(), hashC)
+ self.log.info("Make Node1 prefer block C")
+ self.nodes[1].preciousblock(hashC)
+ sync_chain(self.nodes[0:2]) # wait because node 1 may not have downloaded hashC
+ assert_equal(self.nodes[1].getbestblockhash(), hashC)
+ self.log.info("Make Node1 prefer block G again")
+ self.nodes[1].preciousblock(hashG)
+ assert_equal(self.nodes[1].getbestblockhash(), hashG)
+ self.log.info("Make Node0 prefer block G again")
+ self.nodes[0].preciousblock(hashG)
+ assert_equal(self.nodes[0].getbestblockhash(), hashG)
+ self.log.info("Make Node1 prefer block C again")
+ self.nodes[1].preciousblock(hashC)
+ assert_equal(self.nodes[1].getbestblockhash(), hashC)
+ self.log.info("Mine another block (E-F-G-)H on Node 0 and reorg Node 1")
+ self.nodes[0].generate(1)
+ assert_equal(self.nodes[0].getblockcount(), 6)
+ sync_blocks(self.nodes[0:2])
+ hashH = self.nodes[0].getbestblockhash()
+ assert_equal(self.nodes[1].getbestblockhash(), hashH)
+ self.log.info("Node1 should not be able to prefer block C anymore")
+ self.nodes[1].preciousblock(hashC)
+ assert_equal(self.nodes[1].getbestblockhash(), hashH)
+ self.log.info("Mine competing blocks I-J-K-L on Node 2")
+ self.nodes[2].generate(4)
+ assert_equal(self.nodes[2].getblockcount(), 6)
+ hashL = self.nodes[2].getbestblockhash()
+ self.log.info("Connect nodes and check no reorg occurs")
+ node_sync_via_rpc(self.nodes[1:3])
+ connect_nodes_bi(self.nodes,1,2)
+ connect_nodes_bi(self.nodes,0,2)
+ assert_equal(self.nodes[0].getbestblockhash(), hashH)
+ assert_equal(self.nodes[1].getbestblockhash(), hashH)
+ assert_equal(self.nodes[2].getbestblockhash(), hashL)
+ self.log.info("Make Node1 prefer block L")
+ self.nodes[1].preciousblock(hashL)
+ assert_equal(self.nodes[1].getbestblockhash(), hashL)
+ self.log.info("Make Node2 prefer block H")
+ self.nodes[2].preciousblock(hashH)
+ assert_equal(self.nodes[2].getbestblockhash(), hashH)
+
+if __name__ == '__main__':
+ PreciousTest().main()