Merge bitcoin#16267: bench: Benchmark blockToJSON

91509ff bench: Benchmark blockToJSON (Kirill Fomichev)

Pull request description:

  Related:
  - "getblock performance issue on verbosity" bitcoin#15925
  - "refactor: Avoid UniValue copy constructor" bitcoin#15974

ACKs for top commit:
  laanwj:
    ACK 91509ff

Tree-SHA512: e70b12cb31921c7527bde334f52f39776da698b6bbdb196079a8b68478c67585a5bd7bed7403f65166bd604f7ed60778c53dc064d743bb8368318a1283d1073e

src/Makefile.bench.include

@@ -36,6 +36,7 @@ bench_bench_dash_SOURCES = \
   bench/mempool_eviction.cpp \
   bench/nanobench.h \
   bench/nanobench.cpp \
+  bench/rpc_blockchain.cpp \
   bench/rpc_mempool.cpp \
   bench/util_time.cpp \
   bench/base58.cpp \

src/bench/rpc_blockchain.cpp

@@ -0,0 +1,33 @@
+// Copyright (c) 2016-2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <bench/bench.h>
+#include <bench/data.h>
+
+#include <validation.h>
+#include <streams.h>
+#include <consensus/validation.h>
+#include <rpc/blockchain.h>
+
+#include <univalue.h>
+
+static void BlockToJsonVerbose(benchmark::State& state) {
+    CDataStream stream(benchmark::data::block413567, SER_NETWORK, PROTOCOL_VERSION);
+    char a = '\0';
+    stream.write(&a, 1); // Prevent compaction
+
+    CBlock block;
+    stream >> block;
+
+    CBlockIndex blockindex;
+    const uint256 blockHash = block.GetHash();
+    blockindex.phashBlock = &blockHash;
+    blockindex.nBits = 403014710;
+
+    while (state.KeepRunning()) {
+        (void)blockToJSON(block, &blockindex, &blockindex, /*verbose*/ true);
+    }
+}
+
+BENCHMARK(BlockToJsonVerbose, 10);