Merge #14121: Index for BIP 157 block filters

c7efb652f3 blockfilter: Update BIP 158 test vectors. (Jim Posen)
19308c9e21 rpc: Add getblockfilter RPC method. (Jim Posen)
ff35105096 init: Add CLI option to enable block filter index. (Jim Posen)
accc8b8b18 index: Access functions for global block filter indexes. (Jim Posen)
2bc90e4e7b test: Unit test for block filter index reorg handling. (Jim Posen)
6bcf0998c0 test: Unit tests for block index filter. (Jim Posen)
b5e8200db7 index: Implement lookup methods on block filter index. (Jim Posen)
75a76e3619 index: Implement block filter index with write operations. (Jim Posen)
2ad2338ef9 serialize: Serialization support for big-endian 32-bit ints. (Jim Posen)
ba6ff9a6f7 blockfilter: Functions to translate filter types to/from names. (Jim Posen)
62b7a4f094 index: Ensure block locator is not stale after chain reorg. (Jim Posen)
4368384f1d index: Allow atomic commits of index state to be extended. (Jim Posen)

Pull request description:

  This introduces a new BlockFilterIndex class, which is required for BIP 157 support.

  The index is uses the asynchronous BaseIndex infrastructure driven by the ValidationInterface callbacks. Filters are stored sequentially in flat files and the disk location of each filter is indexed in LevelDB along with the filter hash and header. The index is designed to ensure persistence of filters reorganized out of the main chain to simplify the BIP 157 net implementation.

  Stats (block height = 565500):
  - Syncing the index from scratch takes 45m
  - Total index size is 3.8 GiB

ACKs for commit c7efb6:
  MarcoFalke:
    utACK c7efb652f3543b001b4dd22186a354605b14f47e
  ryanofsky:
    Slightly tested ACK c7efb652f3543b001b4dd22186a354605b14f47e (I just rebuilt the index with the updated PR and tested the RPC). Changes since last review: rebase, fixed compile errors in internal commits, new comments, updated error messages, tweaked cache size logic, renamed commit method, renamed constants and globals, fixed whitespace, extra BlockFilterIndex::Init error check.

Tree-SHA512: f8ed7a9b6f76df45933aa5eba92b27b3af83f6df2ccb3728a5c89eec80f654344dc14f055f6f63eb9b3a7649dd8af6553fe14969889e7e2fd2f8461574d18f28

3 files changed, 334 insertions, 8 deletions

diff --git a/src/test/blockfilter_index_tests.cpp b/src/test/blockfilter_index_tests.cpp
new file mode 100644
index 0000000000..f0a24777a6
--- /dev/null
+++ b/src/test/blockfilter_index_tests.cpp
@@ -0,0 +1,307 @@
+// Copyright (c) 2017-2018 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 <blockfilter.h>
+#include <chainparams.h>
+#include <consensus/validation.h>
+#include <index/blockfilterindex.h>
+#include <miner.h>
+#include <pow.h>
+#include <test/test_bitcoin.h>
+#include <script/standard.h>
+#include <validation.h>
+
+#include <boost/test/unit_test.hpp>
+
+BOOST_AUTO_TEST_SUITE(blockfilter_index_tests)
+
+static bool ComputeFilter(BlockFilterType filter_type, const CBlockIndex* block_index,
+                          BlockFilter& filter)
+{
+    CBlock block;
+    if (!ReadBlockFromDisk(block, block_index->GetBlockPos(), Params().GetConsensus())) {
+        return false;
+    }
+
+    CBlockUndo block_undo;
+    if (block_index->nHeight > 0 && !UndoReadFromDisk(block_undo, block_index)) {
+        return false;
+    }
+
+    filter = BlockFilter(filter_type, block, block_undo);
+    return true;
+}
+
+static bool CheckFilterLookups(BlockFilterIndex& filter_index, const CBlockIndex* block_index,
+                               uint256& last_header)
+{
+    BlockFilter expected_filter;
+    if (!ComputeFilter(filter_index.GetFilterType(), block_index, expected_filter)) {
+        BOOST_ERROR("ComputeFilter failed on block " << block_index->nHeight);
+        return false;
+    }
+
+    BlockFilter filter;
+    uint256 filter_header;
+    std::vector<BlockFilter> filters;
+    std::vector<uint256> filter_hashes;
+
+    BOOST_CHECK(filter_index.LookupFilter(block_index, filter));
+    BOOST_CHECK(filter_index.LookupFilterHeader(block_index, filter_header));
+    BOOST_CHECK(filter_index.LookupFilterRange(block_index->nHeight, block_index, filters));
+    BOOST_CHECK(filter_index.LookupFilterHashRange(block_index->nHeight, block_index,
+                                                   filter_hashes));
+
+    BOOST_CHECK_EQUAL(filters.size(), 1);
+    BOOST_CHECK_EQUAL(filter_hashes.size(), 1);
+
+    BOOST_CHECK_EQUAL(filter.GetHash(), expected_filter.GetHash());
+    BOOST_CHECK_EQUAL(filter_header, expected_filter.ComputeHeader(last_header));
+    BOOST_CHECK_EQUAL(filters[0].GetHash(), expected_filter.GetHash());
+    BOOST_CHECK_EQUAL(filter_hashes[0], expected_filter.GetHash());
+
+    filters.clear();
+    filter_hashes.clear();
+    last_header = filter_header;
+    return true;
+}
+
+static CBlock CreateBlock(const CBlockIndex* prev,
+                          const std::vector<CMutableTransaction>& txns,
+                          const CScript& scriptPubKey)
+{
+    const CChainParams& chainparams = Params();
+    std::unique_ptr<CBlockTemplate> pblocktemplate = BlockAssembler(chainparams).CreateNewBlock(scriptPubKey);
+    CBlock& block = pblocktemplate->block;
+    block.hashPrevBlock = prev->GetBlockHash();
+    block.nTime = prev->nTime + 1;
+
+    // Replace mempool-selected txns with just coinbase plus passed-in txns:
+    block.vtx.resize(1);
+    for (const CMutableTransaction& tx : txns) {
+        block.vtx.push_back(MakeTransactionRef(tx));
+    }
+    // IncrementExtraNonce creates a valid coinbase and merkleRoot
+    unsigned int extraNonce = 0;
+    IncrementExtraNonce(&block, prev, extraNonce);
+
+    while (!CheckProofOfWork(block.GetHash(), block.nBits, chainparams.GetConsensus())) ++block.nNonce;
+
+    return block;
+}
+
+static bool BuildChain(const CBlockIndex* pindex, const CScript& coinbase_script_pub_key,
+                       size_t length, std::vector<std::shared_ptr<CBlock>>& chain)
+{
+    std::vector<CMutableTransaction> no_txns;
+
+    chain.resize(length);
+    for (auto& block : chain) {
+        block = std::make_shared<CBlock>(CreateBlock(pindex, no_txns, coinbase_script_pub_key));
+        CBlockHeader header = block->GetBlockHeader();
+
+        CValidationState state;
+        if (!ProcessNewBlockHeaders({header}, state, Params(), &pindex, nullptr)) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+BOOST_FIXTURE_TEST_CASE(blockfilter_index_initial_sync, TestChain100Setup)
+{
+    BlockFilterIndex filter_index(BlockFilterType::BASIC, 1 << 20, true);
+
+    uint256 last_header;
+
+    // Filter should not be found in the index before it is started.
+    {
+        LOCK(cs_main);
+
+        BlockFilter filter;
+        uint256 filter_header;
+        std::vector<BlockFilter> filters;
+        std::vector<uint256> filter_hashes;
+
+        for (const CBlockIndex* block_index = chainActive.Genesis();
+             block_index != nullptr;
+             block_index = chainActive.Next(block_index)) {
+            BOOST_CHECK(!filter_index.LookupFilter(block_index, filter));
+            BOOST_CHECK(!filter_index.LookupFilterHeader(block_index, filter_header));
+            BOOST_CHECK(!filter_index.LookupFilterRange(block_index->nHeight, block_index, filters));
+            BOOST_CHECK(!filter_index.LookupFilterHashRange(block_index->nHeight, block_index,
+                                                            filter_hashes));
+        }
+    }
+
+    // BlockUntilSyncedToCurrentChain should return false before index is started.
+    BOOST_CHECK(!filter_index.BlockUntilSyncedToCurrentChain());
+
+    filter_index.Start();
+
+    // Allow filter index to catch up with the block index.
+    constexpr int64_t timeout_ms = 10 * 1000;
+    int64_t time_start = GetTimeMillis();
+    while (!filter_index.BlockUntilSyncedToCurrentChain()) {
+        BOOST_REQUIRE(time_start + timeout_ms > GetTimeMillis());
+        MilliSleep(100);
+    }
+
+    // Check that filter index has all blocks that were in the chain before it started.
+    {
+        LOCK(cs_main);
+        const CBlockIndex* block_index;
+        for (block_index = chainActive.Genesis();
+             block_index != nullptr;
+             block_index = chainActive.Next(block_index)) {
+            CheckFilterLookups(filter_index, block_index, last_header);
+        }
+    }
+
+    // Create two forks.
+    const CBlockIndex* tip;
+    {
+        LOCK(cs_main);
+        tip = chainActive.Tip();
+    }
+    CScript coinbase_script_pub_key = GetScriptForDestination(coinbaseKey.GetPubKey().GetID());
+    std::vector<std::shared_ptr<CBlock>> chainA, chainB;
+    BOOST_REQUIRE(BuildChain(tip, coinbase_script_pub_key, 10, chainA));
+    BOOST_REQUIRE(BuildChain(tip, coinbase_script_pub_key, 10, chainB));
+
+    // Check that new blocks on chain A get indexed.
+    uint256 chainA_last_header = last_header;
+    for (size_t i = 0; i < 2; i++) {
+        const auto& block = chainA[i];
+        BOOST_REQUIRE(ProcessNewBlock(Params(), block, true, nullptr));
+
+        const CBlockIndex* block_index;
+        {
+            LOCK(cs_main);
+            block_index = LookupBlockIndex(block->GetHash());
+        }
+
+        BOOST_CHECK(filter_index.BlockUntilSyncedToCurrentChain());
+        CheckFilterLookups(filter_index, block_index, chainA_last_header);
+    }
+
+    // Reorg to chain B.
+    uint256 chainB_last_header = last_header;
+    for (size_t i = 0; i < 3; i++) {
+        const auto& block = chainB[i];
+        BOOST_REQUIRE(ProcessNewBlock(Params(), block, true, nullptr));
+
+        const CBlockIndex* block_index;
+        {
+            LOCK(cs_main);
+            block_index = LookupBlockIndex(block->GetHash());
+        }
+
+        BOOST_CHECK(filter_index.BlockUntilSyncedToCurrentChain());
+        CheckFilterLookups(filter_index, block_index, chainB_last_header);
+    }
+
+    // Check that filters for stale blocks on A can be retrieved.
+    chainA_last_header = last_header;
+    for (size_t i = 0; i < 2; i++) {
+        const auto& block = chainA[i];
+        const CBlockIndex* block_index;
+        {
+            LOCK(cs_main);
+            block_index = LookupBlockIndex(block->GetHash());
+        }
+
+        BOOST_CHECK(filter_index.BlockUntilSyncedToCurrentChain());
+        CheckFilterLookups(filter_index, block_index, chainA_last_header);
+    }
+
+    // Reorg back to chain A.
+     for (size_t i = 2; i < 4; i++) {
+         const auto& block = chainA[i];
+        BOOST_REQUIRE(ProcessNewBlock(Params(), block, true, nullptr));
+     }
+
+     // Check that chain A and B blocks can be retrieved.
+     chainA_last_header = last_header;
+     chainB_last_header = last_header;
+     for (size_t i = 0; i < 3; i++) {
+         const CBlockIndex* block_index;
+
+         {
+             LOCK(cs_main);
+             block_index = LookupBlockIndex(chainA[i]->GetHash());
+         }
+         BOOST_CHECK(filter_index.BlockUntilSyncedToCurrentChain());
+         CheckFilterLookups(filter_index, block_index, chainA_last_header);
+
+         {
+             LOCK(cs_main);
+             block_index = LookupBlockIndex(chainB[i]->GetHash());
+         }
+         BOOST_CHECK(filter_index.BlockUntilSyncedToCurrentChain());
+         CheckFilterLookups(filter_index, block_index, chainB_last_header);
+     }
+
+    // Test lookups for a range of filters/hashes.
+    std::vector<BlockFilter> filters;
+    std::vector<uint256> filter_hashes;
+
+    {
+        LOCK(cs_main);
+        tip = chainActive.Tip();
+    }
+    BOOST_CHECK(filter_index.LookupFilterRange(0, tip, filters));
+    BOOST_CHECK(filter_index.LookupFilterHashRange(0, tip, filter_hashes));
+
+    BOOST_CHECK_EQUAL(filters.size(), tip->nHeight + 1);
+    BOOST_CHECK_EQUAL(filter_hashes.size(), tip->nHeight + 1);
+
+    filters.clear();
+    filter_hashes.clear();
+
+    filter_index.Interrupt();
+    filter_index.Stop();
+}
+
+BOOST_FIXTURE_TEST_CASE(blockfilter_index_init_destroy, BasicTestingSetup)
+{
+    SetDataDir("tempdir");
+
+    BlockFilterIndex* filter_index;
+
+    filter_index = GetBlockFilterIndex(BlockFilterType::BASIC);
+    BOOST_CHECK(filter_index == nullptr);
+
+    BOOST_CHECK(InitBlockFilterIndex(BlockFilterType::BASIC, 1 << 20, true, false));
+
+    filter_index = GetBlockFilterIndex(BlockFilterType::BASIC);
+    BOOST_CHECK(filter_index != nullptr);
+    BOOST_CHECK(filter_index->GetFilterType() == BlockFilterType::BASIC);
+
+    // Initialize returns false if index already exists.
+    BOOST_CHECK(!InitBlockFilterIndex(BlockFilterType::BASIC, 1 << 20, true, false));
+
+    int iter_count = 0;
+    ForEachBlockFilterIndex([&iter_count](BlockFilterIndex& _index) { iter_count++; });
+    BOOST_CHECK_EQUAL(iter_count, 1);
+
+    BOOST_CHECK(DestroyBlockFilterIndex(BlockFilterType::BASIC));
+
+    // Destroy returns false because index was already destroyed.
+    BOOST_CHECK(!DestroyBlockFilterIndex(BlockFilterType::BASIC));
+
+    filter_index = GetBlockFilterIndex(BlockFilterType::BASIC);
+    BOOST_CHECK(filter_index == nullptr);
+
+    // Reinitialize index.
+    BOOST_CHECK(InitBlockFilterIndex(BlockFilterType::BASIC, 1 << 20, true, false));
+
+    DestroyAllBlockFilterIndexes();
+
+    filter_index = GetBlockFilterIndex(BlockFilterType::BASIC);
+    BOOST_CHECK(filter_index == nullptr);
+}
+
+BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/blockfilter_tests.cpp b/src/test/blockfilter_tests.cpp
index f4c74af098..df0a041e0e 100644
--- a/src/test/blockfilter_tests.cpp
+++ b/src/test/blockfilter_tests.cpp
@@ -54,7 +54,7 @@ BOOST_AUTO_TEST_CASE(gcsfilter_default_constructor)
 
 BOOST_AUTO_TEST_CASE(blockfilter_basic_test)
 {
-    CScript included_scripts[5], excluded_scripts[3];
+    CScript included_scripts[5], excluded_scripts[4];
 
     // First two are outputs on a single transaction.
     included_scripts[0] << std::vector<unsigned char>(0, 65) << OP_CHECKSIG;
@@ -73,14 +73,19 @@ BOOST_AUTO_TEST_CASE(blockfilter_basic_test)
     // This script is not related to the block at all.
     excluded_scripts[1] << std::vector<unsigned char>(5, 33) << OP_CHECKSIG;
 
+    // OP_RETURN is non-standard since it's not followed by a data push, but is still excluded from
+    // filter.
+    excluded_scripts[2] << OP_RETURN << OP_4 << OP_ADD << OP_8 << OP_EQUAL;
+
     CMutableTransaction tx_1;
     tx_1.vout.emplace_back(100, included_scripts[0]);
     tx_1.vout.emplace_back(200, included_scripts[1]);
+    tx_1.vout.emplace_back(0, excluded_scripts[0]);
 
     CMutableTransaction tx_2;
     tx_2.vout.emplace_back(300, included_scripts[2]);
-    tx_2.vout.emplace_back(0, excluded_scripts[0]);
-    tx_2.vout.emplace_back(400, excluded_scripts[2]); // Script is empty
+    tx_2.vout.emplace_back(0, excluded_scripts[2]);
+    tx_2.vout.emplace_back(400, excluded_scripts[3]); // Script is empty
 
     CBlock block;
     block.vtx.push_back(MakeTransactionRef(tx_1));
@@ -90,7 +95,7 @@ BOOST_AUTO_TEST_CASE(blockfilter_basic_test)
     block_undo.vtxundo.emplace_back();
     block_undo.vtxundo.back().vprevout.emplace_back(CTxOut(500, included_scripts[3]), 1000, true);
     block_undo.vtxundo.back().vprevout.emplace_back(CTxOut(600, included_scripts[4]), 10000, false);
-    block_undo.vtxundo.back().vprevout.emplace_back(CTxOut(700, excluded_scripts[2]), 100000, false);
+    block_undo.vtxundo.back().vprevout.emplace_back(CTxOut(700, excluded_scripts[3]), 100000, false);
 
     BlockFilter block_filter(BlockFilterType::BASIC, block, block_undo);
     const GCSFilter& filter = block_filter.GetFilter();
@@ -174,4 +179,16 @@ BOOST_AUTO_TEST_CASE(blockfilters_json_test)
     }
 }
 
+BOOST_AUTO_TEST_CASE(blockfilter_type_names)
+{
+    BOOST_CHECK_EQUAL(BlockFilterTypeName(BlockFilterType::BASIC), "basic");
+    BOOST_CHECK_EQUAL(BlockFilterTypeName(static_cast<BlockFilterType>(255)), "");
+
+    BlockFilterType filter_type;
+    BOOST_CHECK(BlockFilterTypeByName("basic", filter_type));
+    BOOST_CHECK_EQUAL(filter_type, BlockFilterType::BASIC);
+
+    BOOST_CHECK(!BlockFilterTypeByName("unknown", filter_type));
+}
+
 BOOST_AUTO_TEST_SUITE_END()
diff --git a/src/test/data/blockfilters.json b/src/test/data/blockfilters.json
index 134b788eed..8945296a07 100644
--- a/src/test/data/blockfilters.json
+++ b/src/test/data/blockfilters.json
@@ -3,9 +3,11 @@
 [0,"000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943","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",[],"0000000000000000000000000000000000000000000000000000000000000000","019dfca8","21584579b7eb08997773e5aeff3a7f932700042d0ed2a6129012b7d7ae81b750","Genesis block"],
 [2,"000000006c02c8ea6e4ff69651f7fcde348fb9d557a06e6957b65552002a7820","0100000006128e87be8b1b4dea47a7247d5528d2702c96826c7a648497e773b800000000e241352e3bec0a95a6217e10c3abb54adfa05abb12c126695595580fb92e222032e7494dffff001d00d235340101000000010000000000000000000000000000000000000000000000000000000000000000ffffffff0e0432e7494d010e062f503253482fffffffff0100f2052a010000002321038a7f6ef1c8ca0c588aa53fa860128077c9e6c11e6830f4d7ee4e763a56b7718fac00000000",[],"d7bdac13a59d745b1add0d2ce852f1a0442e8945fc1bf3848d3cbffd88c24fe1","0174a170","186afd11ef2b5e7e3504f2e8cbf8df28a1fd251fe53d60dff8b1467d1b386cf0",""],
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