qa: Add tests for submitheader

Author: MarcoFalke

test/functional/mining_basic.py

@@ -9,16 +9,23 @@
 - submitblock"""
 
 import copy
-from binascii import b2a_hex
 from decimal import Decimal
 
 from test_framework.blocktools import create_coinbase
-from test_framework.messages import CBlock
+from test_framework.messages import (
+    CBlock,
+    CBlockHeader,
+)
+from test_framework.mininode import (
+    P2PDataStore,
+)
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal, assert_raises_rpc_error
+from test_framework.util import (
+    assert_equal,
+    assert_raises_rpc_error,
+    bytes_to_hex_str as b2x,
+)
 
-def b2x(b):
-    return b2a_hex(b).decode('ascii')
 
 def assert_template(node, block, expect, rehash=True):
     if rehash:
@@ -131,5 +138,67 @@ def run_test(self):
         bad_block.hashPrevBlock = 123
         assert_template(node, bad_block, 'inconclusive-not-best-prevblk')
 
+        self.log.info('submitheader tests')
+        assert_raises_rpc_error(-22, 'Block header decode failed', lambda: node.submitheader(hexdata='xx' * 80))
+        assert_raises_rpc_error(-22, 'Block header decode failed', lambda: node.submitheader(hexdata='ff' * 78))
+        assert_raises_rpc_error(-25, 'Must submit previous header', lambda: node.submitheader(hexdata='ff' * 80))
+
+        block.solve()
+
+        def chain_tip(b_hash, *, status='headers-only', branchlen=1):
+            return {'hash': b_hash, 'height': 202, 'branchlen': branchlen, 'status': status}
+
+        assert chain_tip(block.hash) not in node.getchaintips()
+        node.submitheader(hexdata=b2x(block.serialize()))
+        assert chain_tip(block.hash) in node.getchaintips()
+        node.submitheader(hexdata=b2x(CBlockHeader(block).serialize()))  # Noop
+        assert chain_tip(block.hash) in node.getchaintips()
+
+        bad_block_root = copy.deepcopy(block)
+        bad_block_root.hashMerkleRoot += 2
+        bad_block_root.solve()
+        assert chain_tip(bad_block_root.hash) not in node.getchaintips()
+        node.submitheader(hexdata=b2x(CBlockHeader(bad_block_root).serialize()))
+        assert chain_tip(bad_block_root.hash) in node.getchaintips()
+        # Should still reject invalid blocks, even if we have the header:
+        assert_equal(node.submitblock(hexdata=b2x(bad_block_root.serialize())), 'invalid')
+        assert chain_tip(bad_block_root.hash) in node.getchaintips()
+        # We know the header for this invalid block, so should just return early without error:
+        node.submitheader(hexdata=b2x(CBlockHeader(bad_block_root).serialize()))
+        assert chain_tip(bad_block_root.hash) in node.getchaintips()
+
+        bad_block_lock = copy.deepcopy(block)
+        bad_block_lock.vtx[0].nLockTime = 2**32 - 1
+        bad_block_lock.vtx[0].rehash()
+        bad_block_lock.hashMerkleRoot = bad_block_lock.calc_merkle_root()
+        bad_block_lock.solve()
+        assert_equal(node.submitblock(hexdata=b2x(bad_block_lock.serialize())), 'invalid')
+        # Build a "good" block on top of the submitted bad block
+        bad_block2 = copy.deepcopy(block)
+        bad_block2.hashPrevBlock = bad_block_lock.sha256
+        bad_block2.solve()
+        assert_raises_rpc_error(-25, 'bad-prevblk', lambda: node.submitheader(hexdata=b2x(CBlockHeader(bad_block2).serialize())))
+
+        # Should reject invalid header right away
+        bad_block_time = copy.deepcopy(block)
+        bad_block_time.nTime = 1
+        bad_block_time.solve()
+        assert_raises_rpc_error(-25, 'time-too-old', lambda: node.submitheader(hexdata=b2x(CBlockHeader(bad_block_time).serialize())))
+
+        # Should ask for the block from a p2p node, if they announce the header as well:
+        node.add_p2p_connection(P2PDataStore())
+        node.p2p.wait_for_getheaders(timeout=5)  # Drop the first getheaders
+        node.p2p.send_blocks_and_test(blocks=[block], rpc=node)
+        # Must be active now:
+        assert chain_tip(block.hash, status='active', branchlen=0) in node.getchaintips()
+
+        # Building a few blocks should give the same results
+        node.generate(10)
+        assert_raises_rpc_error(-25, 'time-too-old', lambda: node.submitheader(hexdata=b2x(CBlockHeader(bad_block_time).serialize())))
+        assert_raises_rpc_error(-25, 'bad-prevblk', lambda: node.submitheader(hexdata=b2x(CBlockHeader(bad_block2).serialize())))
+        node.submitheader(hexdata=b2x(CBlockHeader(block).serialize()))
+        node.submitheader(hexdata=b2x(CBlockHeader(bad_block_root).serialize()))
+
+
 if __name__ == '__main__':
     MiningTest().main()