From ed6d1a2c7be9d046d5e78330d5e163023a6b302a Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Thu, 25 Sep 2014 08:21:21 +0200
Subject: Keep information about all block files in memory

---
 src/main.cpp | 76 +++++++++++++++++++++++++++++++-----------------------------
 1 file changed, 39 insertions(+), 37 deletions(-)

(limited to 'src/main.cpp')

diff --git a/src/main.cpp b/src/main.cpp
index 44ac232aad..9cf3afef7d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -108,7 +108,7 @@ namespace {
     set<CBlockIndex*, CBlockIndexWorkComparator> setBlockIndexValid;
 
     CCriticalSection cs_LastBlockFile;
-    CBlockFileInfo infoLastBlockFile;
+    std::vector<CBlockFileInfo> vinfoBlockFile;
     int nLastBlockFile = 0;
 
     // Every received block is assigned a unique and increasing identifier, so we
@@ -1522,7 +1522,7 @@ void static FlushBlockFile(bool fFinalize = false)
     FILE *fileOld = OpenBlockFile(posOld);
     if (fileOld) {
         if (fFinalize)
-            TruncateFile(fileOld, infoLastBlockFile.nSize);
+            TruncateFile(fileOld, vinfoBlockFile[nLastBlockFile].nSize);
         FileCommit(fileOld);
         fclose(fileOld);
     }
@@ -1530,7 +1530,7 @@ void static FlushBlockFile(bool fFinalize = false)
     fileOld = OpenUndoFile(posOld);
     if (fileOld) {
         if (fFinalize)
-            TruncateFile(fileOld, infoLastBlockFile.nUndoSize);
+            TruncateFile(fileOld, vinfoBlockFile[nLastBlockFile].nUndoSize);
         FileCommit(fileOld);
         fclose(fileOld);
     }
@@ -2107,32 +2107,32 @@ bool FindBlockPos(CValidationState &state, CDiskBlockPos &pos, unsigned int nAdd
 
     LOCK(cs_LastBlockFile);
 
-    if (fKnown) {
-        if (nLastBlockFile != pos.nFile) {
-            nLastBlockFile = pos.nFile;
-            infoLastBlockFile.SetNull();
-            pblocktree->ReadBlockFileInfo(nLastBlockFile, infoLastBlockFile);
-            fUpdatedLast = true;
-        }
-    } else {
-        while (infoLastBlockFile.nSize + nAddSize >= MAX_BLOCKFILE_SIZE) {
-            LogPrintf("Leaving block file %i: %s\n", nLastBlockFile, infoLastBlockFile.ToString());
+    unsigned int nFile = fKnown ? pos.nFile : nLastBlockFile;
+    if (vinfoBlockFile.size() <= nFile) {
+        vinfoBlockFile.resize(nFile + 1);
+    }
+
+    if (!fKnown) {
+        while (vinfoBlockFile[nFile].nSize + nAddSize >= MAX_BLOCKFILE_SIZE) {
+            LogPrintf("Leaving block file %i: %s\n", nFile, vinfoBlockFile[nFile].ToString());
             FlushBlockFile(true);
-            nLastBlockFile++;
-            infoLastBlockFile.SetNull();
-            pblocktree->ReadBlockFileInfo(nLastBlockFile, infoLastBlockFile); // check whether data for the new file somehow already exist; can fail just fine
+            nFile++;
+            if (vinfoBlockFile.size() <= nFile) {
+                vinfoBlockFile.resize(nFile + 1);
+            }
             fUpdatedLast = true;
         }
-        pos.nFile = nLastBlockFile;
-        pos.nPos = infoLastBlockFile.nSize;
+        pos.nFile = nFile;
+        pos.nPos = vinfoBlockFile[nFile].nSize;
     }
 
-    infoLastBlockFile.nSize += nAddSize;
-    infoLastBlockFile.AddBlock(nHeight, nTime);
+    nLastBlockFile = nFile;
+    vinfoBlockFile[nFile].nSize += nAddSize;
+    vinfoBlockFile[nFile].AddBlock(nHeight, nTime);
 
     if (!fKnown) {
         unsigned int nOldChunks = (pos.nPos + BLOCKFILE_CHUNK_SIZE - 1) / BLOCKFILE_CHUNK_SIZE;
-        unsigned int nNewChunks = (infoLastBlockFile.nSize + BLOCKFILE_CHUNK_SIZE - 1) / BLOCKFILE_CHUNK_SIZE;
+        unsigned int nNewChunks = (vinfoBlockFile[nFile].nSize + BLOCKFILE_CHUNK_SIZE - 1) / BLOCKFILE_CHUNK_SIZE;
         if (nNewChunks > nOldChunks) {
             if (CheckDiskSpace(nNewChunks * BLOCKFILE_CHUNK_SIZE - pos.nPos)) {
                 FILE *file = OpenBlockFile(pos);
@@ -2147,7 +2147,7 @@ bool FindBlockPos(CValidationState &state, CDiskBlockPos &pos, unsigned int nAdd
         }
     }
 
-    if (!pblocktree->WriteBlockFileInfo(nLastBlockFile, infoLastBlockFile))
+    if (!pblocktree->WriteBlockFileInfo(nLastBlockFile, vinfoBlockFile[nFile]))
         return state.Abort("Failed to write file info");
     if (fUpdatedLast)
         pblocktree->WriteLastBlockFile(nLastBlockFile);
@@ -2162,19 +2162,10 @@ bool FindUndoPos(CValidationState &state, int nFile, CDiskBlockPos &pos, unsigne
     LOCK(cs_LastBlockFile);
 
     unsigned int nNewSize;
-    if (nFile == nLastBlockFile) {
-        pos.nPos = infoLastBlockFile.nUndoSize;
-        nNewSize = (infoLastBlockFile.nUndoSize += nAddSize);
-        if (!pblocktree->WriteBlockFileInfo(nLastBlockFile, infoLastBlockFile))
-            return state.Abort("Failed to write block info");
-    } else {
-        CBlockFileInfo info;
-        if (!pblocktree->ReadBlockFileInfo(nFile, info))
-            return state.Abort("Failed to read block info");
-        pos.nPos = info.nUndoSize;
-        nNewSize = (info.nUndoSize += nAddSize);
-        if (!pblocktree->WriteBlockFileInfo(nFile, info))
-            return state.Abort("Failed to write block info");
+    pos.nPos = vinfoBlockFile[nFile].nUndoSize;
+    nNewSize = vinfoBlockFile[nFile].nUndoSize += nAddSize;
+    if (!pblocktree->WriteBlockFileInfo(nLastBlockFile, vinfoBlockFile[nLastBlockFile])) {
+        return state.Abort("Failed to write block info");
     }
 
     unsigned int nOldChunks = (pos.nPos + UNDOFILE_CHUNK_SIZE - 1) / UNDOFILE_CHUNK_SIZE;
@@ -2826,9 +2817,20 @@ bool static LoadBlockIndexDB()
 
     // Load block file info
     pblocktree->ReadLastBlockFile(nLastBlockFile);
+    vinfoBlockFile.resize(nLastBlockFile + 1);
     LogPrintf("LoadBlockIndexDB(): last block file = %i\n", nLastBlockFile);
-    if (pblocktree->ReadBlockFileInfo(nLastBlockFile, infoLastBlockFile))
-        LogPrintf("LoadBlockIndexDB(): last block file info: %s\n", infoLastBlockFile.ToString());
+    for (int nFile = 0; nFile <= nLastBlockFile; nFile++) {
+        pblocktree->ReadBlockFileInfo(nFile, vinfoBlockFile[nFile]);
+    }
+    LogPrintf("LoadBlockIndexDB(): last block file info: %s\n", vinfoBlockFile[nLastBlockFile].ToString());
+    for (int nFile = nLastBlockFile + 1; true; nFile++) {
+        CBlockFileInfo info;
+        if (pblocktree->ReadBlockFileInfo(nFile, info)) {
+            vinfoBlockFile.push_back(info);
+        } else {
+            break;
+        }
+    }
 
     // Check presence of blk files
     LogPrintf("Checking all blk files are present...\n");
-- 
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