move-only: Move functions to blockstorage

2 files changed, 265 insertions, 2 deletions

diff --git a/src/node/blockstorage.cpp b/src/node/blockstorage.cpp
index d84a3c9029..39c9acd7c6 100644
--- a/src/node/blockstorage.cpp
+++ b/src/node/blockstorage.cpp
@@ -6,12 +6,16 @@
 
 #include <chain.h>
 #include <chainparams.h>
+#include <clientversion.h>
+#include <consensus/validation.h>
 #include <flatfile.h>
 #include <fs.h>
+#include <hash.h>
 #include <pow.h>
 #include <shutdown.h>
 #include <signet.h>
 #include <streams.h>
+#include <undo.h>
 #include <util/system.h>
 #include <validation.h>
 
@@ -38,6 +42,10 @@ std::set<CBlockIndex*> setDirtyBlockIndex;
 std::set<int> setDirtyFileInfo;
 // } // namespace
 
+static FILE* OpenUndoFile(const FlatFilePos &pos, bool fReadOnly = false);
+static FlatFileSeq BlockFileSeq();
+static FlatFileSeq UndoFileSeq();
+
 bool IsBlockPruned(const CBlockIndex* pblockindex)
 {
     return (fHavePruned && !(pblockindex->nStatus & BLOCK_HAVE_DATA) && pblockindex->nTx > 0);
@@ -84,8 +92,217 @@ void CleanupBlockRevFiles()
     }
 }
 
-// From validation. TODO move here
-bool FindBlockPos(FlatFilePos& pos, unsigned int nAddSize, unsigned int nHeight, CChain& active_chain, uint64_t nTime, bool fKnown = false);
+std::string CBlockFileInfo::ToString() const
+{
+    return strprintf("CBlockFileInfo(blocks=%u, size=%u, heights=%u...%u, time=%s...%s)", nBlocks, nSize, nHeightFirst, nHeightLast, FormatISO8601Date(nTimeFirst), FormatISO8601Date(nTimeLast));
+}
+
+CBlockFileInfo* GetBlockFileInfo(size_t n)
+{
+    LOCK(cs_LastBlockFile);
+
+    return &vinfoBlockFile.at(n);
+}
+
+static bool UndoWriteToDisk(const CBlockUndo& blockundo, FlatFilePos& pos, const uint256& hashBlock, const CMessageHeader::MessageStartChars& messageStart)
+{
+    // Open history file to append
+    CAutoFile fileout(OpenUndoFile(pos), SER_DISK, CLIENT_VERSION);
+    if (fileout.IsNull())
+        return error("%s: OpenUndoFile failed", __func__);
+
+    // Write index header
+    unsigned int nSize = GetSerializeSize(blockundo, fileout.GetVersion());
+    fileout << messageStart << nSize;
+
+    // Write undo data
+    long fileOutPos = ftell(fileout.Get());
+    if (fileOutPos < 0)
+        return error("%s: ftell failed", __func__);
+    pos.nPos = (unsigned int)fileOutPos;
+    fileout << blockundo;
+
+    // calculate & write checksum
+    CHashWriter hasher(SER_GETHASH, PROTOCOL_VERSION);
+    hasher << hashBlock;
+    hasher << blockundo;
+    fileout << hasher.GetHash();
+
+    return true;
+}
+
+bool UndoReadFromDisk(CBlockUndo& blockundo, const CBlockIndex* pindex)
+{
+    FlatFilePos pos = pindex->GetUndoPos();
+    if (pos.IsNull()) {
+        return error("%s: no undo data available", __func__);
+    }
+
+    // Open history file to read
+    CAutoFile filein(OpenUndoFile(pos, true), SER_DISK, CLIENT_VERSION);
+    if (filein.IsNull())
+        return error("%s: OpenUndoFile failed", __func__);
+
+    // Read block
+    uint256 hashChecksum;
+    CHashVerifier<CAutoFile> verifier(&filein); // We need a CHashVerifier as reserializing may lose data
+    try {
+        verifier << pindex->pprev->GetBlockHash();
+        verifier >> blockundo;
+        filein >> hashChecksum;
+    }
+    catch (const std::exception& e) {
+        return error("%s: Deserialize or I/O error - %s", __func__, e.what());
+    }
+
+    // Verify checksum
+    if (hashChecksum != verifier.GetHash())
+        return error("%s: Checksum mismatch", __func__);
+
+    return true;
+}
+
+static void FlushUndoFile(int block_file, bool finalize = false)
+{
+    FlatFilePos undo_pos_old(block_file, vinfoBlockFile[block_file].nUndoSize);
+    if (!UndoFileSeq().Flush(undo_pos_old, finalize)) {
+        AbortNode("Flushing undo file to disk failed. This is likely the result of an I/O error.");
+    }
+}
+
+void FlushBlockFile(bool fFinalize = false, bool finalize_undo = false)
+{
+    LOCK(cs_LastBlockFile);
+    FlatFilePos block_pos_old(nLastBlockFile, vinfoBlockFile[nLastBlockFile].nSize);
+    if (!BlockFileSeq().Flush(block_pos_old, fFinalize)) {
+        AbortNode("Flushing block file to disk failed. This is likely the result of an I/O error.");
+    }
+    // we do not always flush the undo file, as the chain tip may be lagging behind the incoming blocks,
+    // e.g. during IBD or a sync after a node going offline
+    if (!fFinalize || finalize_undo) FlushUndoFile(nLastBlockFile, finalize_undo);
+}
+
+uint64_t CalculateCurrentUsage()
+{
+    LOCK(cs_LastBlockFile);
+
+    uint64_t retval = 0;
+    for (const CBlockFileInfo &file : vinfoBlockFile) {
+        retval += file.nSize + file.nUndoSize;
+    }
+    return retval;
+}
+
+void UnlinkPrunedFiles(const std::set<int>& setFilesToPrune)
+{
+    for (std::set<int>::iterator it = setFilesToPrune.begin(); it != setFilesToPrune.end(); ++it) {
+        FlatFilePos pos(*it, 0);
+        fs::remove(BlockFileSeq().FileName(pos));
+        fs::remove(UndoFileSeq().FileName(pos));
+        LogPrintf("Prune: %s deleted blk/rev (%05u)\n", __func__, *it);
+    }
+}
+
+static FlatFileSeq BlockFileSeq()
+{
+    return FlatFileSeq(gArgs.GetBlocksDirPath(), "blk", gArgs.GetBoolArg("-fastprune", false) ? 0x4000 /* 16kb */ : BLOCKFILE_CHUNK_SIZE);
+}
+
+static FlatFileSeq UndoFileSeq()
+{
+    return FlatFileSeq(gArgs.GetBlocksDirPath(), "rev", UNDOFILE_CHUNK_SIZE);
+}
+
+FILE* OpenBlockFile(const FlatFilePos &pos, bool fReadOnly) {
+    return BlockFileSeq().Open(pos, fReadOnly);
+}
+
+/** Open an undo file (rev?????.dat) */
+static FILE* OpenUndoFile(const FlatFilePos &pos, bool fReadOnly) {
+    return UndoFileSeq().Open(pos, fReadOnly);
+}
+
+fs::path GetBlockPosFilename(const FlatFilePos &pos)
+{
+    return BlockFileSeq().FileName(pos);
+}
+
+bool FindBlockPos(FlatFilePos& pos, unsigned int nAddSize, unsigned int nHeight, CChain& active_chain, uint64_t nTime, bool fKnown = false)
+{
+    LOCK(cs_LastBlockFile);
+
+    unsigned int nFile = fKnown ? pos.nFile : nLastBlockFile;
+    if (vinfoBlockFile.size() <= nFile) {
+        vinfoBlockFile.resize(nFile + 1);
+    }
+
+    bool finalize_undo = false;
+    if (!fKnown) {
+        while (vinfoBlockFile[nFile].nSize + nAddSize >= (gArgs.GetBoolArg("-fastprune", false) ? 0x10000 /* 64kb */ : MAX_BLOCKFILE_SIZE)) {
+            // when the undo file is keeping up with the block file, we want to flush it explicitly
+            // when it is lagging behind (more blocks arrive than are being connected), we let the
+            // undo block write case handle it
+            assert(std::addressof(::ChainActive()) == std::addressof(active_chain));
+            finalize_undo = (vinfoBlockFile[nFile].nHeightLast == (unsigned int)active_chain.Tip()->nHeight);
+            nFile++;
+            if (vinfoBlockFile.size() <= nFile) {
+                vinfoBlockFile.resize(nFile + 1);
+            }
+        }
+        pos.nFile = nFile;
+        pos.nPos = vinfoBlockFile[nFile].nSize;
+    }
+
+    if ((int)nFile != nLastBlockFile) {
+        if (!fKnown) {
+            LogPrint(BCLog::VALIDATION, "Leaving block file %i: %s\n", nLastBlockFile, vinfoBlockFile[nLastBlockFile].ToString());
+        }
+        FlushBlockFile(!fKnown, finalize_undo);
+        nLastBlockFile = nFile;
+    }
+
+    vinfoBlockFile[nFile].AddBlock(nHeight, nTime);
+    if (fKnown)
+        vinfoBlockFile[nFile].nSize = std::max(pos.nPos + nAddSize, vinfoBlockFile[nFile].nSize);
+    else
+        vinfoBlockFile[nFile].nSize += nAddSize;
+
+    if (!fKnown) {
+        bool out_of_space;
+        size_t bytes_allocated = BlockFileSeq().Allocate(pos, nAddSize, out_of_space);
+        if (out_of_space) {
+            return AbortNode("Disk space is too low!", _("Disk space is too low!"));
+        }
+        if (bytes_allocated != 0 && fPruneMode) {
+            fCheckForPruning = true;
+        }
+    }
+
+    setDirtyFileInfo.insert(nFile);
+    return true;
+}
+
+static bool FindUndoPos(BlockValidationState &state, int nFile, FlatFilePos &pos, unsigned int nAddSize)
+{
+    pos.nFile = nFile;
+
+    LOCK(cs_LastBlockFile);
+
+    pos.nPos = vinfoBlockFile[nFile].nUndoSize;
+    vinfoBlockFile[nFile].nUndoSize += nAddSize;
+    setDirtyFileInfo.insert(nFile);
+
+    bool out_of_space;
+    size_t bytes_allocated = UndoFileSeq().Allocate(pos, nAddSize, out_of_space);
+    if (out_of_space) {
+        return AbortNode(state, "Disk space is too low!", _("Disk space is too low!"));
+    }
+    if (bytes_allocated != 0 && fPruneMode) {
+        fCheckForPruning = true;
+    }
+
+    return true;
+}
 
 static bool WriteBlockToDisk(const CBlock& block, FlatFilePos& pos, const CMessageHeader::MessageStartChars& messageStart)
 {
@@ -110,6 +327,33 @@ static bool WriteBlockToDisk(const CBlock& block, FlatFilePos& pos, const CMessa
     return true;
 }
 
+bool WriteUndoDataForBlock(const CBlockUndo& blockundo, BlockValidationState& state, CBlockIndex* pindex, const CChainParams& chainparams)
+{
+    // Write undo information to disk
+    if (pindex->GetUndoPos().IsNull()) {
+        FlatFilePos _pos;
+        if (!FindUndoPos(state, pindex->nFile, _pos, ::GetSerializeSize(blockundo, CLIENT_VERSION) + 40))
+            return error("ConnectBlock(): FindUndoPos failed");
+        if (!UndoWriteToDisk(blockundo, _pos, pindex->pprev->GetBlockHash(), chainparams.MessageStart()))
+            return AbortNode(state, "Failed to write undo data");
+        // rev files are written in block height order, whereas blk files are written as blocks come in (often out of order)
+        // we want to flush the rev (undo) file once we've written the last block, which is indicated by the last height
+        // in the block file info as below; note that this does not catch the case where the undo writes are keeping up
+        // with the block writes (usually when a synced up node is getting newly mined blocks) -- this case is caught in
+        // the FindBlockPos function
+        if (_pos.nFile < nLastBlockFile && static_cast<uint32_t>(pindex->nHeight) == vinfoBlockFile[_pos.nFile].nHeightLast) {
+            FlushUndoFile(_pos.nFile, true);
+        }
+
+        // update nUndoPos in block index
+        pindex->nUndoPos = _pos.nPos;
+        pindex->nStatus |= BLOCK_HAVE_UNDO;
+        setDirtyBlockIndex.insert(pindex);
+    }
+
+    return true;
+}
+
 bool ReadBlockFromDisk(CBlock& block, const FlatFilePos& pos, const Consensus::Params& consensusParams)
 {
     block.SetNull();
diff --git a/src/node/blockstorage.h b/src/node/blockstorage.h
index 2cef3abd66..14f072fefb 100644
--- a/src/node/blockstorage.h
+++ b/src/node/blockstorage.h
@@ -12,7 +12,9 @@
 #include <protocol.h> // For CMessageHeader::MessageStartChars
 
 class ArgsManager;
+class BlockValidationState;
 class CBlock;
+class CBlockFileInfo;
 class CBlockIndex;
 class CBlockUndo;
 class CChain;
@@ -47,6 +49,22 @@ bool IsBlockPruned(const CBlockIndex* pblockindex);
 
 void CleanupBlockRevFiles();
 
+/** Open a block file (blk?????.dat) */
+FILE* OpenBlockFile(const FlatFilePos &pos, bool fReadOnly = false);
+/** Translation to a filesystem path */
+fs::path GetBlockPosFilename(const FlatFilePos &pos);
+
+/** Get block file info entry for one block file */
+CBlockFileInfo* GetBlockFileInfo(size_t n);
+
+/** Calculate the amount of disk space the block & undo files currently use */
+uint64_t CalculateCurrentUsage();
+
+/**
+ *  Actually unlink the specified files
+ */
+void UnlinkPrunedFiles(const std::set<int>& setFilesToPrune);
+
 /** Functions for disk access for blocks */
 bool ReadBlockFromDisk(CBlock& block, const FlatFilePos& pos, const Consensus::Params& consensusParams);
 bool ReadBlockFromDisk(CBlock& block, const CBlockIndex* pindex, const Consensus::Params& consensusParams);
@@ -54,6 +72,7 @@ bool ReadRawBlockFromDisk(std::vector<uint8_t>& block, const FlatFilePos& pos, c
 bool ReadRawBlockFromDisk(std::vector<uint8_t>& block, const CBlockIndex* pindex, const CMessageHeader::MessageStartChars& message_start);
 
 bool UndoReadFromDisk(CBlockUndo& blockundo, const CBlockIndex* pindex);
+bool WriteUndoDataForBlock(const CBlockUndo& blockundo, BlockValidationState& state, CBlockIndex* pindex, const CChainParams& chainparams);
 
 FlatFilePos SaveBlockToDisk(const CBlock& block, int nHeight, CChain& active_chain, const CChainParams& chainparams, const FlatFilePos* dbp);