[qa] Simplify import-rescan.py

Get rid of partial functions so the test can be more easily extended to add
more variants of imports with options that affect rescanning (e.g. different
key timestamps).

Also change the second half of the test to send /to/ the imported addresses,
instead of /from/ the imported addresses. The goal of this part of the test was
to confirm that the wallet would pick up new transactions after an import
regardless of whether or not a rescan happened during the import. But because
the wallet can only do this reliably for incoming transactions and not outgoing
transactions (which require the wallet to look up transaction inputs) the test
previously was less meaningful than it should have been.

1 files changed, 112 insertions, 112 deletions

diff --git a/qa/rpc-tests/import-rescan.py b/qa/rpc-tests/import-rescan.py
index 8f60e63e2e..7734ad5e47 100755
--- a/qa/rpc-tests/import-rescan.py
+++ b/qa/rpc-tests/import-rescan.py
@@ -2,6 +2,22 @@
 # Copyright (c) 2014-2016 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 rescan behavior of importaddress, importpubkey, importprivkey, and
+importmulti RPCs with different types of keys and rescan options.
+
+Test uses three connected nodes.
+
+In the first part of the test, node 0 creates an address for each type of
+import RPC call and sends BTC to it. Then nodes 1 and 2 import the addresses,
+and the test makes listtransactions and getbalance calls to confirm that the
+importing node either did or did not execute rescans picking up the send
+transactions.
+
+In the second part of the test, node 0 sends more BTC to each address, and the
+test makes more listtransactions and getbalance calls to confirm that the
+importing nodes pick up the new transactions regardless of whether rescans
+happened previously.
+"""
 
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (start_nodes, connect_nodes, sync_blocks, assert_equal)
@@ -10,53 +26,72 @@ from decimal import Decimal
 import collections
 import enum
 import itertools
-import functools
 
 Call = enum.Enum("Call", "single multi")
 Data = enum.Enum("Data", "address pub priv")
-ImportNode = collections.namedtuple("ImportNode", "rescan")
-
-
-def call_import_rpc(call, data, address, scriptPubKey, pubkey, key, label, node, rescan):
-    """Helper that calls a wallet import RPC on a bitcoin node."""
-    watchonly = data != Data.priv
-    if call == Call.single:
-        if data == Data.address:
-            response = node.importaddress(address, label, rescan)
-        elif data == Data.pub:
-            response = node.importpubkey(pubkey, label, rescan)
-        elif data == Data.priv:
-            response = node.importprivkey(key, label, rescan)
-        assert_equal(response, None)
-    elif call == Call.multi:
-        response = node.importmulti([{
-            "scriptPubKey": {
-                "address": address
-            },
-            "timestamp": "now",
-            "pubkeys": [pubkey] if data == Data.pub else [],
-            "keys": [key] if data == Data.priv else [],
-            "label": label,
-            "watchonly": watchonly
-        }], {"rescan": rescan})
-        assert_equal(response, [{"success": True}])
-    return watchonly
-
-
-# List of RPCs that import a wallet key or address in various ways.
-IMPORT_RPCS = [functools.partial(call_import_rpc, call, data) for call, data in itertools.product(Call, Data)]
-
-# List of bitcoind nodes that will import keys.
-IMPORT_NODES = [
-    ImportNode(rescan=True),
-    ImportNode(rescan=False),
-]
+Rescan = enum.Enum("Rescan", "no yes")
+
+
+class Variant(collections.namedtuple("Variant", "call data rescan")):
+    """Helper for importing one key and verifying scanned transactions."""
+
+    def do_import(self):
+        """Call one key import RPC."""
+
+        if self.call == Call.single:
+            if self.data == Data.address:
+                response = self.node.importaddress(self.address["address"], self.label, self.rescan == Rescan.yes)
+            elif self.data == Data.pub:
+                response = self.node.importpubkey(self.address["pubkey"], self.label, self.rescan == Rescan.yes)
+            elif self.data == Data.priv:
+                response = self.node.importprivkey(self.key, self.label, self.rescan == Rescan.yes)
+            assert_equal(response, None)
+        elif self.call == Call.multi:
+            response = self.node.importmulti([{
+                "scriptPubKey": {
+                    "address": self.address["address"]
+                },
+                "timestamp": "now",
+                "pubkeys": [self.address["pubkey"]] if self.data == Data.pub else [],
+                "keys": [self.key] if self.data == Data.priv else [],
+                "label": self.label,
+                "watchonly": self.data != Data.priv
+            }], {"rescan": self.rescan == Rescan.yes})
+            assert_equal(response, [{"success": True}])
+
+    def check(self, txid=None, amount=None):
+        """Verify that getbalance/listtransactions return expected values."""
+
+        balance = self.node.getbalance(self.label, 0, True)
+        assert_equal(balance, self.expected_balance)
+
+        txs = self.node.listtransactions(self.label, 10000, 0, True)
+        assert_equal(len(txs), self.expected_txs)
+
+        if txid is not None:
+            tx, = [tx for tx in txs if tx["txid"] == txid]
+            assert_equal(tx["account"], self.label)
+            assert_equal(tx["address"], self.address["address"])
+            assert_equal(tx["amount"], amount)
+            assert_equal(tx["category"], "receive")
+            assert_equal(tx["label"], self.label)
+            assert_equal(tx["txid"], txid)
+            assert_equal(tx["confirmations"], 1)
+            assert_equal("trusted" not in tx, True)
+            if self.data != Data.priv:
+                assert_equal(tx["involvesWatchonly"], True)
+            else:
+                assert_equal("involvesWatchonly" not in tx, True)
+
+
+# List of Variants for each way a key or address could be imported.
+IMPORT_VARIANTS = [Variant(*variants) for variants in itertools.product(Call, Data, Rescan)]
 
 
 class ImportRescanTest(BitcoinTestFramework):
     def __init__(self):
         super().__init__()
-        self.num_nodes = 1 + len(IMPORT_NODES)
+        self.num_nodes = 3
 
     def setup_network(self):
         extra_args = [["-debug=1"] for _ in range(self.num_nodes)]
@@ -67,89 +102,54 @@ class ImportRescanTest(BitcoinTestFramework):
     def run_test(self):
         # Create one transaction on node 0 with a unique amount and label for
         # each possible type of wallet import RPC.
-        import_rpc_variants = []
-        for i, import_rpc in enumerate(IMPORT_RPCS):
-            label = "label{}".format(i)
-            addr = self.nodes[0].validateaddress(self.nodes[0].getnewaddress(label))
-            key = self.nodes[0].dumpprivkey(addr["address"])
-            amount = 24.9375 - i * .0625
-            txid = self.nodes[0].sendtoaddress(addr["address"], amount)
-            import_rpc = functools.partial(import_rpc, addr["address"], addr["scriptPubKey"], addr["pubkey"], key,
-                                           label)
-            import_rpc_variants.append((import_rpc, label, amount, txid, addr))
-
+        for i, variant in enumerate(IMPORT_VARIANTS):
+            variant.label = "label {} {}".format(i, variant)
+            variant.address = self.nodes[0].validateaddress(self.nodes[0].getnewaddress(variant.label))
+            variant.key = self.nodes[0].dumpprivkey(variant.address["address"])
+            variant.initial_amount = 25 - (i + 1) / 4.0
+            variant.initial_txid = self.nodes[0].sendtoaddress(variant.address["address"], variant.initial_amount)
+
+        # Generate a block containing the initial transactions.
         self.nodes[0].generate(1)
         assert_equal(self.nodes[0].getrawmempool(), [])
         sync_blocks(self.nodes)
 
-        # For each importing node and variation of wallet import RPC, invoke
-        # the RPC and check the results from getbalance and listtransactions.
-        for node, import_node in zip(self.nodes[1:], IMPORT_NODES):
-            for import_rpc, label, amount, txid, addr in import_rpc_variants:
-                watchonly = import_rpc(node, import_node.rescan)
-
-                balance = node.getbalance(label, 0, True)
-                if import_node.rescan:
-                    assert_equal(balance, amount)
-                else:
-                    assert_equal(balance, 0)
-
-                txs = node.listtransactions(label, 10000, 0, True)
-                if import_node.rescan:
-                    assert_equal(len(txs), 1)
-                    assert_equal(txs[0]["account"], label)
-                    assert_equal(txs[0]["address"], addr["address"])
-                    assert_equal(txs[0]["amount"], amount)
-                    assert_equal(txs[0]["category"], "receive")
-                    assert_equal(txs[0]["label"], label)
-                    assert_equal(txs[0]["txid"], txid)
-                    assert_equal(txs[0]["confirmations"], 1)
-                    assert_equal("trusted" not in txs[0], True)
-                    if watchonly:
-                        assert_equal(txs[0]["involvesWatchonly"], True)
-                    else:
-                        assert_equal("involvesWatchonly" not in txs[0], True)
-                else:
-                    assert_equal(len(txs), 0)
-
-        # Create spends for all the imported addresses.
-        spend_txids = []
+        # For each variation of wallet key import, invoke the import RPC and
+        # check the results from getbalance and listtransactions. Import to
+        # node 1 if rescanning is expected, and to node 2 if rescanning is not
+        # expected. Node 2 is reserved for imports that do not cause rescans,
+        # so later import calls don't inadvertently cause the wallet to pick up
+        # transactions from earlier import calls where a rescan was not
+        # expected (this would make it complicated to figure out expected
+        # balances in the second part of the test.)
+        for variant in IMPORT_VARIANTS:
+            variant.node = self.nodes[1 if variant.rescan == Rescan.yes else 2]
+            variant.do_import()
+            if variant.rescan == Rescan.yes:
+                variant.expected_balance = variant.initial_amount
+                variant.expected_txs = 1
+                variant.check(variant.initial_txid, variant.initial_amount)
+            else:
+                variant.expected_balance = 0
+                variant.expected_txs = 0
+                variant.check()
+
+        # Create new transactions sending to each address.
         fee = self.nodes[0].getnetworkinfo()["relayfee"]
-        for import_rpc, label, amount, txid, addr in import_rpc_variants:
-            raw_tx = self.nodes[0].getrawtransaction(txid)
-            decoded_tx = self.nodes[0].decoderawtransaction(raw_tx)
-            input_vout = next(out["n"] for out in decoded_tx["vout"]
-                              if out["scriptPubKey"]["addresses"] == [addr["address"]])
-            inputs = [{"txid": txid, "vout": input_vout}]
-            outputs = {self.nodes[0].getnewaddress(): Decimal(amount) - fee}
-            raw_spend_tx = self.nodes[0].createrawtransaction(inputs, outputs)
-            signed_spend_tx = self.nodes[0].signrawtransaction(raw_spend_tx)
-            spend_txid = self.nodes[0].sendrawtransaction(signed_spend_tx["hex"])
-            spend_txids.append(spend_txid)
+        for i, variant in enumerate(IMPORT_VARIANTS):
+            variant.sent_amount = 25 - (2 * i + 1) / 8.0
+            variant.sent_txid = self.nodes[0].sendtoaddress(variant.address["address"], variant.sent_amount)
 
+        # Generate a block containing the new transactions.
         self.nodes[0].generate(1)
         assert_equal(self.nodes[0].getrawmempool(), [])
         sync_blocks(self.nodes)
 
-        # Check the results from getbalance and listtransactions after the spends.
-        for node, import_node in zip(self.nodes[1:], IMPORT_NODES):
-            txs = node.listtransactions("*", 10000, 0, True)
-            for (import_rpc, label, amount, txid, addr), spend_txid in zip(import_rpc_variants, spend_txids):
-                balance = node.getbalance(label, 0, True)
-                spend_tx = [tx for tx in txs if tx["txid"] == spend_txid]
-                if import_node.rescan:
-                    assert_equal(balance, amount)
-                    assert_equal(len(spend_tx), 1)
-                    assert_equal(spend_tx[0]["account"], "")
-                    assert_equal(spend_tx[0]["amount"] + spend_tx[0]["fee"], -amount)
-                    assert_equal(spend_tx[0]["category"], "send")
-                    assert_equal("label" not in spend_tx[0], True)
-                    assert_equal(spend_tx[0]["confirmations"], 1)
-                    assert_equal("trusted" not in spend_tx[0], True)
-                    assert_equal("involvesWatchonly" not in txs[0], True)
-                else:
-                    assert_equal(balance, 0)
-                    assert_equal(spend_tx, [])
+        # Check the latest results from getbalance and listtransactions.
+        for variant in IMPORT_VARIANTS:
+            variant.expected_balance += variant.sent_amount
+            variant.expected_txs += 1
+            variant.check(variant.sent_txid, variant.sent_amount)
 
 
 if __name__ == "__main__":