bitcoin · achow101 · May 2, 2023 · Apr 27, 2020
diff --git a/doc/release-notes-26094.md b/doc/release-notes-26094.md
@@ -0,0 +1,6 @@
+- The `getbalances` RPC now returns a `lastprocessedblock` JSON object which contains the wallet's last processed block
+  hash and height at the time the balances were calculated. This result shouldn't be cached because importing new keys could invalidate it.
+- The `gettransaction` RPC now returns a `lastprocessedblock` JSON object which contains the wallet's last processed block
+  hash and height at the time the transaction information was generated.
+- The `getwalletinfo` RPC now returns a `lastprocessedblock` JSON object which contains the wallet's last processed block
+  hash and height at the time the wallet information was generated.
diff --git a/src/wallet/rpc/coins.cpp b/src/wallet/rpc/coins.cpp
@@ -448,6 +448,7 @@ RPCHelpMan getbalances()
                     {RPCResult::Type::STR_AMOUNT, "untrusted_pending", "untrusted pending balance (outputs created by others that are in the mempool)"},
                     {RPCResult::Type::STR_AMOUNT, "immature", "balance from immature coinbase outputs"},
                 }},
+                RESULT_LAST_PROCESSED_BLOCK,
             }
             },
         RPCExamples{
@@ -488,6 +489,8 @@ RPCHelpMan getbalances()
         balances_watchonly.pushKV("immature", ValueFromAmount(bal.m_watchonly_immature));
         balances.pushKV("watchonly", balances_watchonly);
     }
+
+    AppendLastProcessedBlock(balances, wallet);
     return balances;
 },
     };

diff --git a/src/wallet/rpc/transactions.cpp b/src/wallet/rpc/transactions.cpp
@@ -731,6 +731,7 @@ RPCHelpMan gettransaction()
                         {
                             {RPCResult::Type::ELISION, "", "Equivalent to the RPC decoderawtransaction method, or the RPC getrawtransaction method when `verbose` is passed."},
                         }},
+                        RESULT_LAST_PROCESSED_BLOCK,
                     })
                 },
                 RPCExamples{
@@ -791,6 +792,7 @@ RPCHelpMan gettransaction()
         entry.pushKV("decoded", decoded);
     }
 
+    AppendLastProcessedBlock(entry, *pwallet);
     return entry;
 },
     };

diff --git a/src/wallet/rpc/util.cpp b/src/wallet/rpc/util.cpp
@@ -177,4 +177,14 @@ void HandleWalletError(const std::shared_ptr<CWallet> wallet, DatabaseStatus& st
         throw JSONRPCError(code, error.original);
     }
 }
+
+void AppendLastProcessedBlock(UniValue& entry, const CWallet& wallet) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
+{
+    AssertLockHeld(wallet.cs_wallet);
+    UniValue lastprocessedblock{UniValue::VOBJ};
+    lastprocessedblock.pushKV("hash", wallet.GetLastBlockHash().GetHex());
+    lastprocessedblock.pushKV("height", wallet.GetLastBlockHeight());
+    entry.pushKV("lastprocessedblock", lastprocessedblock);
+}
+
 } // namespace wallet
diff --git a/src/wallet/rpc/util.h b/src/wallet/rpc/util.h
@@ -5,7 +5,9 @@
 #ifndef BITCOIN_WALLET_RPC_UTIL_H
 #define BITCOIN_WALLET_RPC_UTIL_H
 
+#include <rpc/util.h>
 #include <script/script.h>
+#include <wallet/wallet.h>
 
 #include <any>
 #include <memory>
@@ -17,13 +19,17 @@ class UniValue;
 struct bilingual_str;
 
 namespace wallet {
-class CWallet;
 class LegacyScriptPubKeyMan;
 enum class DatabaseStatus;
 struct WalletContext;
 
 extern const std::string HELP_REQUIRING_PASSPHRASE;
 
+static const RPCResult RESULT_LAST_PROCESSED_BLOCK { RPCResult::Type::OBJ, "lastprocessedblock", "hash and height of the block this information was generated on",{
+    {RPCResult::Type::STR_HEX, "hash", "hash of the block this information was generated on"},
+    {RPCResult::Type::NUM, "height", "height of the block this information was generated on"}}
+};
+
 /**
  * Figures out what wallet, if any, to use for a JSONRPCRequest.
  *
@@ -45,8 +51,8 @@ std::string LabelFromValue(const UniValue& value);
 void PushParentDescriptors(const CWallet& wallet, const CScript& script_pubkey, UniValue& entry);
 
 void HandleWalletError(const std::shared_ptr<CWallet> wallet, DatabaseStatus& status, bilingual_str& error);
-
 int64_t ParseISO8601DateTime(const std::string& str);
+void AppendLastProcessedBlock(UniValue& entry, const CWallet& wallet) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet);
 } //  namespace wallet
 
 #endif // BITCOIN_WALLET_RPC_UTIL_H
diff --git a/src/wallet/rpc/wallet.cpp b/src/wallet/rpc/wallet.cpp
@@ -68,6 +68,7 @@ static RPCHelpMan getwalletinfo()
                         }, /*skip_type_check=*/true},
                         {RPCResult::Type::BOOL, "descriptors", "whether this wallet uses descriptors for scriptPubKey management"},
                         {RPCResult::Type::BOOL, "external_signer", "whether this wallet is configured to use an external signer such as a hardware wallet"},
+                        RESULT_LAST_PROCESSED_BLOCK,
                     }},
                 },
                 RPCExamples{
@@ -129,6 +130,8 @@ static RPCHelpMan getwalletinfo()
     }
     obj.pushKV("descriptors", pwallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
     obj.pushKV("external_signer", pwallet->IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER));
+
+    AppendLastProcessedBlock(obj, *pwallet);
     return obj;
 },
     };

diff --git a/test/functional/wallet_balance.py b/test/functional/wallet_balance.py
@@ -11,6 +11,7 @@
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
+    assert_is_hash_string,
     assert_raises_rpc_error,
 )
 
@@ -183,8 +184,13 @@ def test_balances(*, fee_node_1=0):
                                                  'untrusted_pending': Decimal('30.0') - fee_node_1}}  # Doesn't include output of node 0's send since it was spent
             if self.options.descriptors:
                 del expected_balances_0["watchonly"]
-            assert_equal(self.nodes[0].getbalances(), expected_balances_0)
-            assert_equal(self.nodes[1].getbalances(), expected_balances_1)
+            balances_0 = self.nodes[0].getbalances()
+            balances_1 = self.nodes[1].getbalances()
+            # remove lastprocessedblock keys (they will be tested later)
+            del balances_0['lastprocessedblock']
+            del balances_1['lastprocessedblock']
+            assert_equal(balances_0, expected_balances_0)
+            assert_equal(balances_1, expected_balances_1)
             # getbalance without any arguments includes unconfirmed transactions, but not untrusted transactions
             assert_equal(self.nodes[0].getbalance(), Decimal('9.99'))  # change from node 0's send
             assert_equal(self.nodes[1].getbalance(), Decimal('0'))  # node 1's send had an unsafe input
@@ -309,5 +315,30 @@ def test_balances(*, fee_node_1=0):
             assert_equal(self.nodes[0].getbalances()['mine']['untrusted_pending'], Decimal('0.1'))
 
 
+        # Tests the lastprocessedblock JSON object in getbalances, getwalletinfo
+        # and gettransaction by checking for valid hex strings and by comparing
+        # the hashes & heights between generated blocks.
+        self.log.info("Test getbalances returns expected lastprocessedblock json object")
+        prev_hash = self.nodes[0].getbestblockhash()
+        prev_height = self.nodes[0].getblock(prev_hash)['height']
+        self.generatetoaddress(self.nodes[0], 5, self.nodes[0].get_deterministic_priv_key().address)
+        lastblock = self.nodes[0].getbalances()['lastprocessedblock']
+        assert_is_hash_string(lastblock['hash'])
+        assert_equal((prev_hash == lastblock['hash']), False)
+        assert_equal(lastblock['height'], prev_height + 5)
+
+        prev_hash = self.nodes[0].getbestblockhash()
+        prev_height = self.nodes[0].getblock(prev_hash)['height']
+        self.log.info("Test getwalletinfo returns expected lastprocessedblock json object")
+        walletinfo = self.nodes[0].getwalletinfo()
+        assert_equal(walletinfo['lastprocessedblock']['height'], prev_height)
+        assert_equal(walletinfo['lastprocessedblock']['hash'], prev_hash)
+
+        self.log.info("Test gettransaction returns expected lastprocessedblock json object")
+        txid = self.nodes[1].sendtoaddress(self.nodes[1].getnewaddress(), 0.01)
+        tx_info = self.nodes[1].gettransaction(txid)
+        assert_equal(tx_info['lastprocessedblock']['height'], prev_height)
+        assert_equal(tx_info['lastprocessedblock']['hash'], prev_hash)
+
 if __name__ == '__main__':
     WalletTest().main()
diff --git a/test/functional/wallet_basic.py b/test/functional/wallet_basic.py
@@ -666,7 +666,7 @@ def run_test(self):
                                  "category": baz["category"],
                                  "vout":     baz["vout"]}
         expected_fields = frozenset({'amount', 'bip125-replaceable', 'confirmations', 'details', 'fee',
-                                     'hex', 'time', 'timereceived', 'trusted', 'txid', 'wtxid', 'walletconflicts'})
+                                     'hex', 'lastprocessedblock', 'time', 'timereceived', 'trusted', 'txid', 'wtxid', 'walletconflicts'})
         verbose_field = "decoded"
         expected_verbose_fields = expected_fields | {verbose_field}
 

diff --git a/test/functional/wallet_orphanedreward.py b/test/functional/wallet_orphanedreward.py
@@ -65,7 +65,10 @@ def run_test(self):
         assert_equal(self.nodes[0].getbestblockhash(), orig_chain_tip)
         self.generate(self.nodes[0], 3)
 
-        assert_equal(self.nodes[1].getbalances(), pre_reorg_conf_bals)
+        balances = self.nodes[1].getbalances()
+        del balances["lastprocessedblock"]
+        del pre_reorg_conf_bals["lastprocessedblock"]
+        assert_equal(balances, pre_reorg_conf_bals)
         assert_equal(self.nodes[1].gettransaction(txid)["details"][0]["abandoned"], True)