MOVEONLY: Move BaseIndex to its own file.

1 files changed, 258 insertions, 0 deletions

diff --git a/src/index/base.cpp b/src/index/base.cpp
new file mode 100644
index 0000000000..f381681a64
--- /dev/null
+++ b/src/index/base.cpp
@@ -0,0 +1,258 @@
+// 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 <chainparams.h>
+#include <index/base.h>
+#include <init.h>
+#include <tinyformat.h>
+#include <ui_interface.h>
+#include <util.h>
+#include <validation.h>
+#include <warnings.h>
+
+constexpr int64_t SYNC_LOG_INTERVAL = 30; // seconds
+constexpr int64_t SYNC_LOCATOR_WRITE_INTERVAL = 30; // seconds
+
+template<typename... Args>
+static void FatalError(const char* fmt, const Args&... args)
+{
+    std::string strMessage = tfm::format(fmt, args...);
+    SetMiscWarning(strMessage);
+    LogPrintf("*** %s\n", strMessage);
+    uiInterface.ThreadSafeMessageBox(
+        "Error: A fatal internal error occurred, see debug.log for details",
+        "", CClientUIInterface::MSG_ERROR);
+    StartShutdown();
+}
+
+BaseIndex::~BaseIndex()
+{
+    Interrupt();
+    Stop();
+}
+
+bool BaseIndex::Init()
+{
+    CBlockLocator locator;
+    if (!GetDB().ReadBestBlock(locator)) {
+        locator.SetNull();
+    }
+
+    LOCK(cs_main);
+    m_best_block_index = FindForkInGlobalIndex(chainActive, locator);
+    m_synced = m_best_block_index.load() == chainActive.Tip();
+    return true;
+}
+
+static const CBlockIndex* NextSyncBlock(const CBlockIndex* pindex_prev)
+{
+    AssertLockHeld(cs_main);
+
+    if (!pindex_prev) {
+        return chainActive.Genesis();
+    }
+
+    const CBlockIndex* pindex = chainActive.Next(pindex_prev);
+    if (pindex) {
+        return pindex;
+    }
+
+    return chainActive.Next(chainActive.FindFork(pindex_prev));
+}
+
+void BaseIndex::ThreadSync()
+{
+    const CBlockIndex* pindex = m_best_block_index.load();
+    if (!m_synced) {
+        auto& consensus_params = Params().GetConsensus();
+
+        int64_t last_log_time = 0;
+        int64_t last_locator_write_time = 0;
+        while (true) {
+            if (m_interrupt) {
+                WriteBestBlock(pindex);
+                return;
+            }
+
+            {
+                LOCK(cs_main);
+                const CBlockIndex* pindex_next = NextSyncBlock(pindex);
+                if (!pindex_next) {
+                    WriteBestBlock(pindex);
+                    m_best_block_index = pindex;
+                    m_synced = true;
+                    break;
+                }
+                pindex = pindex_next;
+            }
+
+            int64_t current_time = GetTime();
+            if (last_log_time + SYNC_LOG_INTERVAL < current_time) {
+                LogPrintf("Syncing %s with block chain from height %d\n",
+                          GetName(), pindex->nHeight);
+                last_log_time = current_time;
+            }
+
+            if (last_locator_write_time + SYNC_LOCATOR_WRITE_INTERVAL < current_time) {
+                WriteBestBlock(pindex);
+                last_locator_write_time = current_time;
+            }
+
+            CBlock block;
+            if (!ReadBlockFromDisk(block, pindex, consensus_params)) {
+                FatalError("%s: Failed to read block %s from disk",
+                           __func__, pindex->GetBlockHash().ToString());
+                return;
+            }
+            if (!WriteBlock(block, pindex)) {
+                FatalError("%s: Failed to write block %s to index database",
+                           __func__, pindex->GetBlockHash().ToString());
+                return;
+            }
+        }
+    }
+
+    if (pindex) {
+        LogPrintf("%s is enabled at height %d\n", GetName(), pindex->nHeight);
+    } else {
+        LogPrintf("%s is enabled\n", GetName());
+    }
+}
+
+bool BaseIndex::WriteBestBlock(const CBlockIndex* block_index)
+{
+    LOCK(cs_main);
+    if (!GetDB().WriteBestBlock(chainActive.GetLocator(block_index))) {
+        return error("%s: Failed to write locator to disk", __func__);
+    }
+    return true;
+}
+
+void BaseIndex::BlockConnected(const std::shared_ptr<const CBlock>& block, const CBlockIndex* pindex,
+                               const std::vector<CTransactionRef>& txn_conflicted)
+{
+    if (!m_synced) {
+        return;
+    }
+
+    const CBlockIndex* best_block_index = m_best_block_index.load();
+    if (!best_block_index) {
+        if (pindex->nHeight != 0) {
+            FatalError("%s: First block connected is not the genesis block (height=%d)",
+                       __func__, pindex->nHeight);
+            return;
+        }
+    } else {
+        // Ensure block connects to an ancestor of the current best block. This should be the case
+        // most of the time, but may not be immediately after the sync thread catches up and sets
+        // m_synced. Consider the case where there is a reorg and the blocks on the stale branch are
+        // in the ValidationInterface queue backlog even after the sync thread has caught up to the
+        // new chain tip. In this unlikely event, log a warning and let the queue clear.
+        if (best_block_index->GetAncestor(pindex->nHeight - 1) != pindex->pprev) {
+            LogPrintf("%s: WARNING: Block %s does not connect to an ancestor of " /* Continued */
+                      "known best chain (tip=%s); not updating index\n",
+                      __func__, pindex->GetBlockHash().ToString(),
+                      best_block_index->GetBlockHash().ToString());
+            return;
+        }
+    }
+
+    if (WriteBlock(*block, pindex)) {
+        m_best_block_index = pindex;
+    } else {
+        FatalError("%s: Failed to write block %s to index",
+                   __func__, pindex->GetBlockHash().ToString());
+        return;
+    }
+}
+
+void BaseIndex::ChainStateFlushed(const CBlockLocator& locator)
+{
+    if (!m_synced) {
+        return;
+    }
+
+    const uint256& locator_tip_hash = locator.vHave.front();
+    const CBlockIndex* locator_tip_index;
+    {
+        LOCK(cs_main);
+        locator_tip_index = LookupBlockIndex(locator_tip_hash);
+    }
+
+    if (!locator_tip_index) {
+        FatalError("%s: First block (hash=%s) in locator was not found",
+                   __func__, locator_tip_hash.ToString());
+        return;
+    }
+
+    // This checks that ChainStateFlushed callbacks are received after BlockConnected. The check may fail
+    // immediately after the sync thread catches up and sets m_synced. Consider the case where
+    // there is a reorg and the blocks on the stale branch are in the ValidationInterface queue
+    // backlog even after the sync thread has caught up to the new chain tip. In this unlikely
+    // event, log a warning and let the queue clear.
+    const CBlockIndex* best_block_index = m_best_block_index.load();
+    if (best_block_index->GetAncestor(locator_tip_index->nHeight) != locator_tip_index) {
+        LogPrintf("%s: WARNING: Locator contains block (hash=%s) not on known best " /* Continued */
+                  "chain (tip=%s); not writing index locator\n",
+                  __func__, locator_tip_hash.ToString(),
+                  best_block_index->GetBlockHash().ToString());
+        return;
+    }
+
+    if (!GetDB().WriteBestBlock(locator)) {
+        error("%s: Failed to write locator to disk", __func__);
+    }
+}
+
+bool BaseIndex::BlockUntilSyncedToCurrentChain()
+{
+    AssertLockNotHeld(cs_main);
+
+    if (!m_synced) {
+        return false;
+    }
+
+    {
+        // Skip the queue-draining stuff if we know we're caught up with
+        // chainActive.Tip().
+        LOCK(cs_main);
+        const CBlockIndex* chain_tip = chainActive.Tip();
+        const CBlockIndex* best_block_index = m_best_block_index.load();
+        if (best_block_index->GetAncestor(chain_tip->nHeight) == chain_tip) {
+            return true;
+        }
+    }
+
+    LogPrintf("%s: %s is catching up on block notifications\n", __func__, GetName());
+    SyncWithValidationInterfaceQueue();
+    return true;
+}
+
+void BaseIndex::Interrupt()
+{
+    m_interrupt();
+}
+
+void BaseIndex::Start()
+{
+    // Need to register this ValidationInterface before running Init(), so that
+    // callbacks are not missed if Init sets m_synced to true.
+    RegisterValidationInterface(this);
+    if (!Init()) {
+        FatalError("%s: %s failed to initialize", __func__, GetName());
+        return;
+    }
+
+    m_thread_sync = std::thread(&TraceThread<std::function<void()>>, GetName(),
+                                std::bind(&BaseIndex::ThreadSync, this));
+}
+
+void BaseIndex::Stop()
+{
+    UnregisterValidationInterface(this);
+
+    if (m_thread_sync.joinable()) {
+        m_thread_sync.join();
+    }
+}