Add window final block height to getchaintxstats

The getchaintxstats RPC now returns the additional key of window_final_block_height

Author: leto

doc/release-notes-16695.md

@@ -0,0 +1,5 @@
+Updated RPCs
+------------
+
+- The `getchaintxstats` RPC now returns the additional key of
+  `window_final_block_height`.

src/rpc/blockchain.cpp

@@ -1639,6 +1639,7 @@ static UniValue getchaintxstats(const JSONRPCRequest& request)
             "  \"time\": xxxxx,                         (numeric) The timestamp for the final block in the window in UNIX format.\n"
             "  \"txcount\": xxxxx,                      (numeric) The total number of transactions in the chain up to that point.\n"
             "  \"window_final_block_hash\": \"...\",      (string) The hash of the final block in the window.\n"
+            "  \"window_final_block_height\": xxxxx,    (numeric) The height of the final block in the window.\n"
             "  \"window_block_count\": xxxxx,           (numeric) Size of the window in number of blocks.\n"
             "  \"window_tx_count\": xxxxx,              (numeric) The number of transactions in the window. Only returned if \"window_block_count\" is > 0.\n"
             "  \"window_interval\": xxxxx,              (numeric) The elapsed time in the window in seconds. Only returned if \"window_block_count\" is > 0.\n"
@@ -1689,6 +1690,7 @@ static UniValue getchaintxstats(const JSONRPCRequest& request)
     ret.pushKV("time", (int64_t)pindex->nTime);
     ret.pushKV("txcount", (int64_t)pindex->nChainTx);
     ret.pushKV("window_final_block_hash", pindex->GetBlockHash().GetHex());
+    ret.pushKV("window_final_block_height", pindex->nHeight);
     ret.pushKV("window_block_count", blockcount);
     if (blockcount > 0) {
         ret.pushKV("window_tx_count", nTxDiff);

test/functional/rpc_blockchain.py

@@ -186,6 +186,7 @@ def _test_getchaintxstats(self):
         assert_equal(chaintxstats['time'], b200['time'])
         assert_equal(chaintxstats['txcount'], 201)
         assert_equal(chaintxstats['window_final_block_hash'], b200_hash)
+        assert_equal(chaintxstats['window_final_block_height'], 200)
         assert_equal(chaintxstats['window_block_count'], 199)
         assert_equal(chaintxstats['window_tx_count'], 199)
         assert_equal(chaintxstats['window_interval'], time_diff)
@@ -195,6 +196,7 @@ def _test_getchaintxstats(self):
         assert_equal(chaintxstats['time'], b1['time'])
         assert_equal(chaintxstats['txcount'], 2)
         assert_equal(chaintxstats['window_final_block_hash'], b1_hash)
+        assert_equal(chaintxstats['window_final_block_height'], 1)
         assert_equal(chaintxstats['window_block_count'], 0)
         assert 'window_tx_count' not in chaintxstats
         assert 'window_interval' not in chaintxstats