1 files changed, 313 insertions, 0 deletions
diff --git a/src/wallet/db.h b/src/wallet/db.h
new file mode 100644
index 0000000000..71133f9699
--- /dev/null
+++ b/src/wallet/db.h
@@ -0,0 +1,313 @@
+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2014 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_DB_H
+#define BITCOIN_DB_H
+
+#include "clientversion.h"
+#include "serialize.h"
+#include "streams.h"
+#include "sync.h"
+#include "version.h"
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include <boost/filesystem/path.hpp>
+
+#include <db_cxx.h>
+
+class CDiskBlockIndex;
+class COutPoint;
+
+extern unsigned int nWalletDBUpdated;
+
+void ThreadFlushWalletDB(const std::string& strWalletFile);
+
+
+class CDBEnv
+{
+private:
+    bool fDbEnvInit;
+    bool fMockDb;
+    boost::filesystem::path path;
+
+    void EnvShutdown();
+
+public:
+    mutable CCriticalSection cs_db;
+    DbEnv *dbenv;
+    std::map<std::string, int> mapFileUseCount;
+    std::map<std::string, Db*> mapDb;
+
+    CDBEnv();
+    ~CDBEnv();
+    void Reset();
+
+    void MakeMock();
+    bool IsMock() { return fMockDb; }
+
+    /**
+     * Verify that database file strFile is OK. If it is not,
+     * call the callback to try to recover.
+     * This must be called BEFORE strFile is opened.
+     * Returns true if strFile is OK.
+     */
+    enum VerifyResult { VERIFY_OK,
+                        RECOVER_OK,
+                        RECOVER_FAIL };
+    VerifyResult Verify(std::string strFile, bool (*recoverFunc)(CDBEnv& dbenv, std::string strFile));
+    /**
+     * Salvage data from a file that Verify says is bad.
+     * fAggressive sets the DB_AGGRESSIVE flag (see berkeley DB->verify() method documentation).
+     * Appends binary key/value pairs to vResult, returns true if successful.
+     * NOTE: reads the entire database into memory, so cannot be used
+     * for huge databases.
+     */
+    typedef std::pair<std::vector<unsigned char>, std::vector<unsigned char> > KeyValPair;
+    bool Salvage(std::string strFile, bool fAggressive, std::vector<KeyValPair>& vResult);
+
+    bool Open(const boost::filesystem::path& path);
+    void Close();
+    void Flush(bool fShutdown);
+    void CheckpointLSN(const std::string& strFile);
+
+    void CloseDb(const std::string& strFile);
+    bool RemoveDb(const std::string& strFile);
+
+    DbTxn* TxnBegin(int flags = DB_TXN_WRITE_NOSYNC)
+    {
+        DbTxn* ptxn = NULL;
+        int ret = dbenv->txn_begin(NULL, &ptxn, flags);
+        if (!ptxn || ret != 0)
+            return NULL;
+        return ptxn;
+    }
+};
+
+extern CDBEnv bitdb;
+
+
+/** RAII class that provides access to a Berkeley database */
+class CDB
+{
+protected:
+    Db* pdb;
+    std::string strFile;
+    DbTxn* activeTxn;
+    bool fReadOnly;
+    bool fFlushOnClose;
+
+    explicit CDB(const std::string& strFilename, const char* pszMode = "r+", bool fFlushOnCloseIn=true);
+    ~CDB() { Close(); }
+
+public:
+    void Flush();
+    void Close();
+
+private:
+    CDB(const CDB&);
+    void operator=(const CDB&);
+
+protected:
+    template <typename K, typename T>
+    bool Read(const K& key, T& value)
+    {
+        if (!pdb)
+            return false;
+
+        // Key
+        CDataStream ssKey(SER_DISK, CLIENT_VERSION);
+        ssKey.reserve(1000);
+        ssKey << key;
+        Dbt datKey(&ssKey[0], ssKey.size());
+
+        // Read
+        Dbt datValue;
+        datValue.set_flags(DB_DBT_MALLOC);
+        int ret = pdb->get(activeTxn, &datKey, &datValue, 0);
+        memset(datKey.get_data(), 0, datKey.get_size());
+        if (datValue.get_data() == NULL)
+            return false;
+
+        // Unserialize value
+        try {
+            CDataStream ssValue((char*)datValue.get_data(), (char*)datValue.get_data() + datValue.get_size(), SER_DISK, CLIENT_VERSION);
+            ssValue >> value;
+        } catch (const std::exception&) {
+            return false;
+        }
+
+        // Clear and free memory
+        memset(datValue.get_data(), 0, datValue.get_size());
+        free(datValue.get_data());
+        return (ret == 0);
+    }
+
+    template <typename K, typename T>
+    bool Write(const K& key, const T& value, bool fOverwrite = true)
+    {
+        if (!pdb)
+            return false;
+        if (fReadOnly)
+            assert(!"Write called on database in read-only mode");
+
+        // Key
+        CDataStream ssKey(SER_DISK, CLIENT_VERSION);
+        ssKey.reserve(1000);
+        ssKey << key;
+        Dbt datKey(&ssKey[0], ssKey.size());
+
+        // Value
+        CDataStream ssValue(SER_DISK, CLIENT_VERSION);
+        ssValue.reserve(10000);
+        ssValue << value;
+        Dbt datValue(&ssValue[0], ssValue.size());
+
+        // Write
+        int ret = pdb->put(activeTxn, &datKey, &datValue, (fOverwrite ? 0 : DB_NOOVERWRITE));
+
+        // Clear memory in case it was a private key
+        memset(datKey.get_data(), 0, datKey.get_size());
+        memset(datValue.get_data(), 0, datValue.get_size());
+        return (ret == 0);
+    }
+
+    template <typename K>
+    bool Erase(const K& key)
+    {
+        if (!pdb)
+            return false;
+        if (fReadOnly)
+            assert(!"Erase called on database in read-only mode");
+
+        // Key
+        CDataStream ssKey(SER_DISK, CLIENT_VERSION);
+        ssKey.reserve(1000);
+        ssKey << key;
+        Dbt datKey(&ssKey[0], ssKey.size());
+
+        // Erase
+        int ret = pdb->del(activeTxn, &datKey, 0);
+
+        // Clear memory
+        memset(datKey.get_data(), 0, datKey.get_size());
+        return (ret == 0 || ret == DB_NOTFOUND);
+    }
+
+    template <typename K>
+    bool Exists(const K& key)
+    {
+        if (!pdb)
+            return false;
+
+        // Key
+        CDataStream ssKey(SER_DISK, CLIENT_VERSION);
+        ssKey.reserve(1000);
+        ssKey << key;
+        Dbt datKey(&ssKey[0], ssKey.size());
+
+        // Exists
+        int ret = pdb->exists(activeTxn, &datKey, 0);
+
+        // Clear memory
+        memset(datKey.get_data(), 0, datKey.get_size());
+        return (ret == 0);
+    }
+
+    Dbc* GetCursor()
+    {
+        if (!pdb)
+            return NULL;
+        Dbc* pcursor = NULL;
+        int ret = pdb->cursor(NULL, &pcursor, 0);
+        if (ret != 0)
+            return NULL;
+        return pcursor;
+    }
+
+    int ReadAtCursor(Dbc* pcursor, CDataStream& ssKey, CDataStream& ssValue, unsigned int fFlags = DB_NEXT)
+    {
+        // Read at cursor
+        Dbt datKey;
+        if (fFlags == DB_SET || fFlags == DB_SET_RANGE || fFlags == DB_GET_BOTH || fFlags == DB_GET_BOTH_RANGE) {
+            datKey.set_data(&ssKey[0]);
+            datKey.set_size(ssKey.size());
+        }
+        Dbt datValue;
+        if (fFlags == DB_GET_BOTH || fFlags == DB_GET_BOTH_RANGE) {
+            datValue.set_data(&ssValue[0]);
+            datValue.set_size(ssValue.size());
+        }
+        datKey.set_flags(DB_DBT_MALLOC);
+        datValue.set_flags(DB_DBT_MALLOC);
+        int ret = pcursor->get(&datKey, &datValue, fFlags);
+        if (ret != 0)
+            return ret;
+        else if (datKey.get_data() == NULL || datValue.get_data() == NULL)
+            return 99999;
+
+        // Convert to streams
+        ssKey.SetType(SER_DISK);
+        ssKey.clear();
+        ssKey.write((char*)datKey.get_data(), datKey.get_size());
+        ssValue.SetType(SER_DISK);
+        ssValue.clear();
+        ssValue.write((char*)datValue.get_data(), datValue.get_size());
+
+        // Clear and free memory
+        memset(datKey.get_data(), 0, datKey.get_size());
+        memset(datValue.get_data(), 0, datValue.get_size());
+        free(datKey.get_data());
+        free(datValue.get_data());
+        return 0;
+    }
+
+public:
+    bool TxnBegin()
+    {
+        if (!pdb || activeTxn)
+            return false;
+        DbTxn* ptxn = bitdb.TxnBegin();
+        if (!ptxn)
+            return false;
+        activeTxn = ptxn;
+        return true;
+    }
+
+    bool TxnCommit()
+    {
+        if (!pdb || !activeTxn)
+            return false;
+        int ret = activeTxn->commit(0);
+        activeTxn = NULL;
+        return (ret == 0);
+    }
+
+    bool TxnAbort()
+    {
+        if (!pdb || !activeTxn)
+            return false;
+        int ret = activeTxn->abort();
+        activeTxn = NULL;
+        return (ret == 0);
+    }
+
+    bool ReadVersion(int& nVersion)
+    {
+        nVersion = 0;
+        return Read(std::string("version"), nVersion);
+    }
+
+    bool WriteVersion(int nVersion)
+    {
+        return Write(std::string("version"), nVersion);
+    }
+
+    bool static Rewrite(const std::string& strFile, const char* pszSkip = NULL);
+};
+
+#endif // BITCOIN_DB_H