[rpc] Correct reconsiderblock help text, add test

src/rpc/blockchain.cpp

@@ -1565,7 +1565,7 @@ static UniValue reconsiderblock(const JSONRPCRequest& request)
     if (request.fHelp || request.params.size() != 1)
         throw std::runtime_error(
             RPCHelpMan{"reconsiderblock",
-                "\nRemoves invalidity status of a block and its descendants, reconsider them for activation.\n"
+                "\nRemoves invalidity status of a block, its ancestors and its descendants, reconsider them for activation.\n"
                 "This can be used to undo the effects of invalidateblock.\n",
                 {
                     {"blockhash", RPCArg::Type::STR_HEX, /* opt */ false, /* default_val */ "", "the hash of the block to reconsider"},

test/functional/rpc_invalidateblock.py

@@ -4,10 +4,15 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test the invalidateblock RPC."""
 
-import time
-
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal, connect_nodes_bi, sync_blocks
+from test_framework.address import ADDRESS_BCRT1_UNSPENDABLE
+from test_framework.util import (
+    assert_equal,
+    connect_nodes_bi,
+    sync_blocks,
+    wait_until,
+)
+
 
 class InvalidateTest(BitcoinTestFramework):
     def set_test_params(self):
@@ -21,46 +26,66 @@ class InvalidateTest(BitcoinTestFramework):
         self.log.info("Make sure we repopulate setBlockIndexCandidates after InvalidateBlock:")
         self.log.info("Mine 4 blocks on Node 0")
         self.nodes[0].generatetoaddress(4, self.nodes[0].get_deterministic_priv_key().address)
-        assert(self.nodes[0].getblockcount() == 4)
+        assert_equal(self.nodes[0].getblockcount(), 4)
-        besthash = self.nodes[0].getbestblockhash()
+        besthash_n0 = self.nodes[0].getbestblockhash()
 
         self.log.info("Mine competing 6 blocks on Node 1")
         self.nodes[1].generatetoaddress(6, self.nodes[1].get_deterministic_priv_key().address)
-        assert(self.nodes[1].getblockcount() == 6)
+        assert_equal(self.nodes[1].getblockcount(), 6)
 
         self.log.info("Connect nodes to force a reorg")
-        connect_nodes_bi(self.nodes,0,1)
+        connect_nodes_bi(self.nodes, 0, 1)
         sync_blocks(self.nodes[0:2])
-        assert(self.nodes[0].getblockcount() == 6)
+        assert_equal(self.nodes[0].getblockcount(), 6)
         badhash = self.nodes[1].getblockhash(2)
 
         self.log.info("Invalidate block 2 on node 0 and verify we reorg to node 0's original chain")
         self.nodes[0].invalidateblock(badhash)
-        newheight = self.nodes[0].getblockcount()
+        assert_equal(self.nodes[0].getblockcount(), 4)
-        newhash = self.nodes[0].getbestblockhash()
+        assert_equal(self.nodes[0].getbestblockhash(), besthash_n0)
-        if (newheight != 4 or newhash != besthash):
-            raise AssertionError("Wrong tip for node0, hash %s, height %d"%(newhash,newheight))
 
         self.log.info("Make sure we won't reorg to a lower work chain:")
-        connect_nodes_bi(self.nodes,1,2)
+        connect_nodes_bi(self.nodes, 1, 2)
         self.log.info("Sync node 2 to node 1 so both have 6 blocks")
         sync_blocks(self.nodes[1:3])
-        assert(self.nodes[2].getblockcount() == 6)
+        assert_equal(self.nodes[2].getblockcount(), 6)
         self.log.info("Invalidate block 5 on node 1 so its tip is now at 4")
         self.nodes[1].invalidateblock(self.nodes[1].getblockhash(5))
-        assert(self.nodes[1].getblockcount() == 4)
+        assert_equal(self.nodes[1].getblockcount(), 4)
         self.log.info("Invalidate block 3 on node 2, so its tip is now 2")
         self.nodes[2].invalidateblock(self.nodes[2].getblockhash(3))
-        assert(self.nodes[2].getblockcount() == 2)
+        assert_equal(self.nodes[2].getblockcount(), 2)
         self.log.info("..and then mine a block")
         self.nodes[2].generatetoaddress(1, self.nodes[2].get_deterministic_priv_key().address)
         self.log.info("Verify all nodes are at the right height")
-        time.sleep(5)
+        wait_until(lambda: self.nodes[2].getblockcount() == 3, timeout=5)
-        assert_equal(self.nodes[2].getblockcount(), 3)
+        wait_until(lambda: self.nodes[0].getblockcount() == 4, timeout=5)
-        assert_equal(self.nodes[0].getblockcount(), 4)
+        wait_until(lambda: self.nodes[1].getblockcount() == 4, timeout=5)
-        node1height = self.nodes[1].getblockcount()
+
-        if node1height < 4:
+        self.log.info("Verify that we reconsider all ancestors as well")
-            raise AssertionError("Node 1 reorged to a lower height: %d"%node1height)
+        blocks = self.nodes[1].generatetoaddress(10, ADDRESS_BCRT1_UNSPENDABLE)
+        assert_equal(self.nodes[1].getbestblockhash(), blocks[-1])
+        # Invalidate the two blocks at the tip
+        self.nodes[1].invalidateblock(blocks[-1])
+        self.nodes[1].invalidateblock(blocks[-2])
+        assert_equal(self.nodes[1].getbestblockhash(), blocks[-3])
+        # Reconsider only the previous tip
+        self.nodes[1].reconsiderblock(blocks[-1])
+        # Should be back at the tip by now
+        assert_equal(self.nodes[1].getbestblockhash(), blocks[-1])
+
+        self.log.info("Verify that we reconsider all descendants")
+        blocks = self.nodes[1].generatetoaddress(10, ADDRESS_BCRT1_UNSPENDABLE)
+        assert_equal(self.nodes[1].getbestblockhash(), blocks[-1])
+        # Invalidate the two blocks at the tip
+        self.nodes[1].invalidateblock(blocks[-2])
+        self.nodes[1].invalidateblock(blocks[-4])
+        assert_equal(self.nodes[1].getbestblockhash(), blocks[-5])
+        # Reconsider only the previous tip
+        self.nodes[1].reconsiderblock(blocks[-4])
+        # Should be back at the tip by now
+        assert_equal(self.nodes[1].getbestblockhash(), blocks[-1])
+
 
 if __name__ == '__main__':
     InvalidateTest().main()