Merge #12196: Add scantxoutset RPC method

be98b2d9a8 [QA] Add scantxoutset test (Jonas Schnelli)
eec7cf7b33 scantxoutset: mention that scanning by address will miss P2PK txouts (Jonas Schnelli)
94d73d32ab scantxoutset: support legacy P2PK script type (Jonas Schnelli)
892de1dfea scantxoutset: add support for scripts (Jonas Schnelli)
78304941f7 Blockchain/RPC: Add scantxoutset method to scan UTXO set (Jonas Schnelli)
9048575511 Add FindScriptPubKey() to search the UTXO set (Jonas Schnelli)

Pull request description:

  Alternative to #9152.

  This takes `<n>` pubkeys and optionally  `<n>` xpubs (together with a definable lookup windows where the default is 0-1000) and looks up common scripts in the UTXO set of all given or derived keys.

  The output will be an array similar to `listunspent`. That array is compatible with `createrawtransaction` as well as with `signrawtransaction`.

  This makes it possible to prepare sweeps and have them signed in a secure (cold) space.

Tree-SHA512: a2b22a117cf6e27febeb97e5d6fe30184926d50c0c7cbc77bb4121f490fed65560c52f8eac67a9720d7bf8f420efa42459768685c7e7cc03722859f51a5e1e3b

test/functional/rpc_scantxoutset.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+# Copyright (c) 2018 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 scantxoutset rpc call."""
+from test_framework.test_framework import BitcoinTestFramework
+from test_framework.util import *
+
+import shutil
+import os
+
+class ScantxoutsetTest(BitcoinTestFramework):
+    def set_test_params(self):
+        self.num_nodes = 1
+        self.setup_clean_chain = True
+    def run_test(self):
+        self.log.info("Mining blocks...")
+        self.nodes[0].generate(110)
+
+        addr_P2SH_SEGWIT = self.nodes[0].getnewaddress("", "p2sh-segwit")
+        pubk1 = self.nodes[0].getaddressinfo(addr_P2SH_SEGWIT)['pubkey']
+        addr_LEGACY = self.nodes[0].getnewaddress("", "legacy")
+        pubk2 = self.nodes[0].getaddressinfo(addr_LEGACY)['pubkey']
+        addr_BECH32 = self.nodes[0].getnewaddress("", "bech32")
+        pubk3 = self.nodes[0].getaddressinfo(addr_BECH32)['pubkey']
+        self.nodes[0].sendtoaddress(addr_P2SH_SEGWIT, 1)
+        self.nodes[0].sendtoaddress(addr_LEGACY, 2)
+        self.nodes[0].sendtoaddress(addr_BECH32, 3)
+        self.nodes[0].generate(1)
+
+        self.log.info("Stop node, remove wallet, mine again some blocks...")
+        self.stop_node(0)
+        shutil.rmtree(os.path.join(self.nodes[0].datadir, "regtest", 'wallets'))
+        self.start_node(0)
+        self.nodes[0].generate(110)
+
+        self.restart_node(0, ['-nowallet'])
+        self.log.info("Test if we have found the non HD unspent outputs.")
+        assert_equal(self.nodes[0].scantxoutset("start", [ {"pubkey": {"pubkey": pubk1}}, {"pubkey": {"pubkey": pubk2}}, {"pubkey": {"pubkey": pubk3}}])['total_amount'], 6)
+        assert_equal(self.nodes[0].scantxoutset("start", [ {"address": addr_P2SH_SEGWIT}, {"address": addr_LEGACY}, {"address": addr_BECH32}])['total_amount'], 6)
+        assert_equal(self.nodes[0].scantxoutset("start", [ {"address": addr_P2SH_SEGWIT}, {"address": addr_LEGACY}, {"pubkey": {"pubkey": pubk3}} ])['total_amount'], 6)
+
+        self.log.info("Test invalid parameters.")
+        assert_raises_rpc_error(-8, 'Scanobject "pubkey" must contain an object as value', self.nodes[0].scantxoutset, "start", [ {"pubkey": pubk1}]) #missing pubkey object
+        assert_raises_rpc_error(-8, 'Scanobject "address" must contain a single string as value', self.nodes[0].scantxoutset, "start", [ {"address": {"address": addr_P2SH_SEGWIT}}]) #invalid object for address object
+
+if __name__ == '__main__':
+    ScantxoutsetTest().main()

test/functional/test_runner.py

@@ -142,6 +142,7 @@ BASE_SCRIPTS = [
     'feature_uacomment.py',
     'p2p_unrequested_blocks.py',
     'feature_includeconf.py',
+    'rpc_scantxoutset.py',
     'feature_logging.py',
     'p2p_node_network_limited.py',
     'feature_blocksdir.py',