Never remove database files on shutdown, it caused unreadable wallets on some testers...

[novacoin.git] / src / db.cpp

diff --git a/src/db.cpp b/src/db.cpp
index a22b17e..5cacf19 100644 (file)
--- a/src/db.cpp
+++ b/src/db.cpp
@@ -28,6 +28,23 @@ DbEnv dbenv(0);
 static map<string, int> mapFileUseCount;
 static map<string, Db*> mapDb;
 
+static void EnvShutdown()
+{
+    if (!fDbEnvInit)
+        return;
+
+    fDbEnvInit = false;
+    try
+    {
+        dbenv.close(0);
+    }
+    catch (const DbException& e)
+    {
+        printf("EnvShutdown exception: %s (%d)\n", e.what(), e.get_errno());
+    }
+    DbEnv(0).remove(GetDataDir().c_str(), 0);
+}
+
 class CDBInit
 {
 public:
@@ -36,11 +53,7 @@ public:
     }
     ~CDBInit()
     {
-        if (fDbEnvInit)
-        {
-            dbenv.close(0);
-            fDbEnvInit = false;
-        }
+        EnvShutdown();
     }
 }
 instance_of_cdbinit;
@@ -165,6 +178,99 @@ void static CloseDb(const string& strFile)
     }
 }
 
+bool CDB::Rewrite(const string& strFile, const char* pszSkip)
+{
+    while (!fShutdown)
+    {
+        CRITICAL_BLOCK(cs_db)
+        {
+            if (!mapFileUseCount.count(strFile) || mapFileUseCount[strFile] == 0)
+            {
+                // Flush log data to the dat file
+                CloseDb(strFile);
+                dbenv.txn_checkpoint(0, 0, 0);
+                dbenv.lsn_reset(strFile.c_str(), 0);
+                mapFileUseCount.erase(strFile);
+
+                bool fSuccess = true;
+                printf("Rewriting %s...\n", strFile.c_str());
+                string strFileRes = strFile + ".rewrite";
+                CDB db(strFile.c_str(), "r");
+                Db* pdbCopy = new Db(&dbenv, 0);
+
+                int ret = pdbCopy->open(NULL,                 // Txn pointer
+                                        strFileRes.c_str(),   // Filename
+                                        "main",    // Logical db name
+                                        DB_BTREE,  // Database type
+                                        DB_CREATE,    // Flags
+                                        0);
+                if (ret > 0)
+                {
+                    printf("Cannot create database file %s\n", strFileRes.c_str());
+                    fSuccess = false;
+                }
+
+                Dbc* pcursor = db.GetCursor();
+                if (pcursor)
+                    while (fSuccess)
+                    {
+                        CDataStream ssKey;
+                        CDataStream ssValue;
+                        int ret = db.ReadAtCursor(pcursor, ssKey, ssValue, DB_NEXT);
+                        if (ret == DB_NOTFOUND)
+                        {
+                            pcursor->close();
+                            break;
+                        }
+                        else if (ret != 0)
+                        {
+                            pcursor->close();
+                            fSuccess = false;
+                            break;
+                        }
+                        if (pszSkip &&
+                            strncmp(&ssKey[0], pszSkip, std::min(ssKey.size(), strlen(pszSkip))) == 0)
+                            continue;
+                        if (strncmp(&ssKey[0], "\x07version", 8) == 0)
+                        {
+                            // Update version:
+                            ssValue.clear();
+                            ssValue << VERSION;
+                        }
+                        Dbt datKey(&ssKey[0], ssKey.size());
+                        Dbt datValue(&ssValue[0], ssValue.size());
+                        int ret2 = pdbCopy->put(NULL, &datKey, &datValue, DB_NOOVERWRITE);
+                        if (ret2 > 0)
+                            fSuccess = false;
+                    }
+                if (fSuccess)
+                {
+                    db.Close();
+                    CloseDb(strFile);
+                    if (pdbCopy->close(0))
+                        fSuccess = false;
+                    delete pdbCopy;
+                }
+                if (fSuccess)
+                {
+                    Db dbA(&dbenv, 0);
+                    if (dbA.remove(strFile.c_str(), NULL, 0))
+                        fSuccess = false;
+                    Db dbB(&dbenv, 0);
+                    if (dbB.rename(strFileRes.c_str(), NULL, strFile.c_str(), 0))
+                        fSuccess = false;
+                }
+                if (!fSuccess)
+                    printf("Rewriting of %s FAILED!\n", strFileRes.c_str());
+                return fSuccess;
+            }
+        }
+        Sleep(100);
+    }
+    return false;
+}
+
+
 void DBFlush(bool fShutdown)
 {
     // Flush log data to the actual data file
@@ -196,9 +302,10 @@ void DBFlush(bool fShutdown)
         {
             char** listp;
             if (mapFileUseCount.empty())
+            {
                 dbenv.log_archive(&listp, DB_ARCH_REMOVE);
-            dbenv.close(0);
-            fDbEnvInit = false;
+                EnvShutdown();
+            }
         }
     }
 }
@@ -674,6 +781,7 @@ int CWalletDB::LoadWallet(CWallet* pwallet)
     pwallet->vchDefaultKey.clear();
     int nFileVersion = 0;
     vector<uint256> vWalletUpgrade;
+    bool fIsEncrypted = false;
 
     // Modify defaults
 #ifndef __WXMSW__
@@ -799,6 +907,7 @@ int CWalletDB::LoadWallet(CWallet* pwallet)
                 ssValue >> vchPrivKey;
                 if (!pwallet->LoadCryptedKey(vchPubKey, vchPrivKey))
                     return DB_CORRUPT;
+                fIsEncrypted = true;
             }
             else if (strType == "defaultkey")
             {
@@ -859,8 +968,11 @@ int CWalletDB::LoadWallet(CWallet* pwallet)
         printf("fUseUPnP = %d\n", fUseUPnP);
 
 
-    // Upgrade
-    if (nFileVersion < VERSION)
+    // Rewrite encrypted wallets of versions 0.4.0 and 0.5.0rc:
+    if (fIsEncrypted && (nFileVersion == 40000 || nFileVersion == 50000))
+        return DB_NEED_REWRITE;
+
+    if (nFileVersion < VERSION) // Update
     {
         // Get rid of old debug.log file in current directory
         if (nFileVersion <= 105 && !pszSetDataDir[0])
@@ -869,7 +981,6 @@ int CWalletDB::LoadWallet(CWallet* pwallet)
         WriteVersion(VERSION);
     }
 
-
     return DB_LOAD_OK;
 }