test: introduce getnewdestination helper for generating various address types

This serves as a replacement for the getnewaddress RPC if no wallet is
available. In addition to the address, it also returns the corresponding
public key and output script (scriptPubKey).

test/functional/p2p_filter.py

@@ -31,7 +31,7 @@ from test_framework.script import MAX_SCRIPT_ELEMENT_SIZE
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.wallet import (
     MiniWallet,
-    random_p2wpkh,
+    getnewdestination,
 )
 
 
@@ -169,14 +169,14 @@ class FilterTest(BitcoinTestFramework):
 
         self.log.info('Check that we only receive a merkleblock if the filter does not match a tx in a block')
         filter_peer.tx_received = False
-        block_hash = self.generatetoscriptpubkey(random_p2wpkh())
+        block_hash = self.generatetoscriptpubkey(getnewdestination()[1])
         filter_peer.wait_for_merkleblock(block_hash)
         assert not filter_peer.tx_received
 
         self.log.info('Check that we not receive a tx if the filter does not match a mempool tx')
         filter_peer.merkleblock_received = False
         filter_peer.tx_received = False
-        self.wallet.send_to(from_node=self.nodes[0], scriptPubKey=random_p2wpkh(), amount=7 * COIN)
+        self.wallet.send_to(from_node=self.nodes[0], scriptPubKey=getnewdestination()[1], amount=7 * COIN)
         filter_peer.sync_send_with_ping()
         assert not filter_peer.merkleblock_received
         assert not filter_peer.tx_received
@@ -190,14 +190,14 @@ class FilterTest(BitcoinTestFramework):
         self.log.info('Check that after deleting filter all txs get relayed again')
         filter_peer.send_and_ping(msg_filterclear())
         for _ in range(5):
-            txid, _ = self.wallet.send_to(from_node=self.nodes[0], scriptPubKey=random_p2wpkh(), amount=7 * COIN)
+            txid, _ = self.wallet.send_to(from_node=self.nodes[0], scriptPubKey=getnewdestination()[1], amount=7 * COIN)
             filter_peer.wait_for_tx(txid)
 
         self.log.info('Check that request for filtered blocks is ignored if no filter is set')
         filter_peer.merkleblock_received = False
         filter_peer.tx_received = False
         with self.nodes[0].assert_debug_log(expected_msgs=['received getdata']):
-            block_hash = self.generatetoscriptpubkey(random_p2wpkh())
+            block_hash = self.generatetoscriptpubkey(getnewdestination()[1])
             filter_peer.wait_for_inv([CInv(MSG_BLOCK, int(block_hash, 16))])
             filter_peer.sync_with_ping()
             assert not filter_peer.merkleblock_received

test/functional/test_framework/wallet.py

@@ -9,7 +9,12 @@ from decimal import Decimal
 from enum import Enum
 from random import choice
 from typing import Optional
-from test_framework.address import create_deterministic_address_bcrt1_p2tr_op_true
+from test_framework.address import (
+    create_deterministic_address_bcrt1_p2tr_op_true,
+    key_to_p2pkh,
+    key_to_p2sh_p2wpkh,
+    key_to_p2wpkh,
+)
 from test_framework.descriptors import descsum_create
 from test_framework.key import ECKey
 from test_framework.messages import (
@@ -31,6 +36,8 @@ from test_framework.script import (
 )
 from test_framework.script_util import (
     key_to_p2pk_script,
+    key_to_p2pkh_script,
+    key_to_p2sh_p2wpkh_script,
     key_to_p2wpkh_script,
 )
 from test_framework.util import (
@@ -209,12 +216,28 @@ class MiniWallet:
         return txid
 
 
-def random_p2wpkh():
+def getnewdestination(address_type='bech32'):
-    """Generate a random P2WPKH scriptPubKey. Can be used when a random destination is needed,
+    """Generate a random destination of the specified type and return the
-    but no compiled wallet is available (e.g. as replacement to the getnewaddress RPC)."""
+       corresponding public key, scriptPubKey and address. Supported types are
+       'legacy', 'p2sh-segwit' and 'bech32'. Can be used when a random
+       destination is needed, but no compiled wallet is available (e.g. as
+       replacement to the getnewaddress/getaddressinfo RPCs)."""
     key = ECKey()
     key.generate()
-    return key_to_p2wpkh_script(key.get_pubkey().get_bytes())
+    pubkey = key.get_pubkey().get_bytes()
+    if address_type == 'legacy':
+        scriptpubkey = key_to_p2pkh_script(pubkey)
+        address = key_to_p2pkh(pubkey)
+    elif address_type == 'p2sh-segwit':
+        scriptpubkey = key_to_p2sh_p2wpkh_script(pubkey)
+        address = key_to_p2sh_p2wpkh(pubkey)
+    elif address_type == 'bech32':
+        scriptpubkey = key_to_p2wpkh_script(pubkey)
+        address = key_to_p2wpkh(pubkey)
+    # TODO: also support bech32m (need to generate x-only-pubkey)
+    else:
+        assert False
+    return pubkey, scriptpubkey, address
 
 
 def make_chain(node, address, privkeys, parent_txid, parent_value, n=0, parent_locking_script=None, fee=DEFAULT_FEE):