test: use MiniWallet for feature_maxuploadtarget.py

This test can now be run even with the Bitcoin Core wallet disabled.

test/functional/feature_maxuploadtarget.py

@@ -13,10 +13,19 @@ if uploadtarget has been reached.
 from collections import defaultdict
 import time
 
-from test_framework.messages import CInv, MSG_BLOCK, msg_getdata
+from test_framework.messages import (
+    CInv,
+    MSG_BLOCK,
+    msg_getdata,
+)
 from test_framework.p2p import P2PInterface
 from test_framework.test_framework import BitcoinTestFramework
-from test_framework.util import assert_equal, mine_large_block
+from test_framework.util import (
+    assert_equal,
+    mine_large_block,
+)
+from test_framework.wallet import MiniWallet
+
 
 class TestP2PConn(P2PInterface):
     def __init__(self):
@@ -41,12 +50,6 @@ class MaxUploadTest(BitcoinTestFramework):
         ]]
         self.supports_cli = False
 
-        # Cache for utxos, as the listunspent may take a long time later in the test
-        self.utxo_cache = []
-
-    def skip_test_if_missing_module(self):
-        self.skip_if_no_wallet()
-
     def run_test(self):
         # Before we connect anything, we first set the time on the node
         # to be in the past, otherwise things break because the CNode
@@ -55,7 +58,8 @@ class MaxUploadTest(BitcoinTestFramework):
         self.nodes[0].setmocktime(old_time)
 
         # Generate some old blocks
-        self.generate(self.nodes[0], 130)
+        self.wallet = MiniWallet(self.nodes[0])
+        self.generate(self.wallet, 130)
 
         # p2p_conns[0] will only request old blocks
         # p2p_conns[1] will only request new blocks
@@ -66,7 +70,7 @@ class MaxUploadTest(BitcoinTestFramework):
             p2p_conns.append(self.nodes[0].add_p2p_connection(TestP2PConn()))
 
         # Now mine a big block
-        mine_large_block(self, self.nodes[0], self.utxo_cache)
+        mine_large_block(self, self.wallet, self.nodes[0])
 
         # Store the hash; we'll request this later
         big_old_block = self.nodes[0].getbestblockhash()
@@ -77,7 +81,7 @@ class MaxUploadTest(BitcoinTestFramework):
         self.nodes[0].setmocktime(int(time.time()) - 2*60*60*24)
 
         # Mine one more block, so that the prior block looks old
-        mine_large_block(self, self.nodes[0], self.utxo_cache)
+        mine_large_block(self, self.wallet, self.nodes[0])
 
         # We'll be requesting this new block too
         big_new_block = self.nodes[0].getbestblockhash()

test/functional/test_framework/util.py

@@ -573,17 +573,17 @@ def create_lots_of_big_transactions(node, txouts, utxos, num, fee):
     return txids
 
 
-def mine_large_block(test_framework, node, utxos=None):
+def mine_large_block(test_framework, mini_wallet, node):
     # generate a 66k transaction,
     # and 14 of them is close to the 1MB block limit
-    num = 14
     txouts = gen_return_txouts()
-    utxos = utxos if utxos is not None else []
-    if len(utxos) < num:
-        utxos.clear()
-        utxos.extend(node.listunspent())
-    fee = 100 * node.getnetworkinfo()["relayfee"]
-    create_lots_of_big_transactions(node, txouts, utxos, num, fee=fee)
+    from .messages import COIN
+    fee = 100 * int(node.getnetworkinfo()["relayfee"] * COIN)
+    for _ in range(14):
+        tx = mini_wallet.create_self_transfer(from_node=node, fee_rate=0, mempool_valid=False)['tx']
+        tx.vout[0].nValue -= fee
+        tx.vout.extend(txouts)
+        mini_wallet.sendrawtransaction(from_node=node, tx_hex=tx.serialize().hex())
     test_framework.generate(node, 1)