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-rw-r--r--src/wallet/db.cpp47
1 files changed, 29 insertions, 18 deletions
diff --git a/src/wallet/db.cpp b/src/wallet/db.cpp
index a2e795056a..ae40553268 100644
--- a/src/wallet/db.cpp
+++ b/src/wallet/db.cpp
@@ -48,7 +48,7 @@ void CheckUniqueFileid(const BerkeleyEnvironment& env, const std::string& filena
}
CCriticalSection cs_db;
-std::map<std::string, BerkeleyEnvironment> g_dbenvs GUARDED_BY(cs_db); //!< Map from directory name to open db environment.
+std::map<std::string, std::weak_ptr<BerkeleyEnvironment>> g_dbenvs GUARDED_BY(cs_db); //!< Map from directory name to db environment.
} // namespace
bool WalletDatabaseFileId::operator==(const WalletDatabaseFileId& rhs) const
@@ -80,19 +80,29 @@ bool IsWalletLoaded(const fs::path& wallet_path)
LOCK(cs_db);
auto env = g_dbenvs.find(env_directory.string());
if (env == g_dbenvs.end()) return false;
- return env->second.IsDatabaseLoaded(database_filename);
+ auto database = env->second.lock();
+ return database && database->IsDatabaseLoaded(database_filename);
}
-BerkeleyEnvironment* GetWalletEnv(const fs::path& wallet_path, std::string& database_filename)
+/**
+ * @param[in] wallet_path Path to wallet directory. Or (for backwards compatibility only) a path to a berkeley btree data file inside a wallet directory.
+ * @param[out] database_filename Filename of berkeley btree data file inside the wallet directory.
+ * @return A shared pointer to the BerkeleyEnvironment object for the wallet directory, never empty because ~BerkeleyEnvironment
+ * erases the weak pointer from the g_dbenvs map.
+ * @post A new BerkeleyEnvironment weak pointer is inserted into g_dbenvs if the directory path key was not already in the map.
+ */
+std::shared_ptr<BerkeleyEnvironment> GetWalletEnv(const fs::path& wallet_path, std::string& database_filename)
{
fs::path env_directory;
SplitWalletPath(wallet_path, env_directory, database_filename);
LOCK(cs_db);
- // Note: An unused temporary BerkeleyEnvironment object may be created inside the
- // emplace function if the key already exists. This is a little inefficient,
- // but not a big concern since the map will be changed in the future to hold
- // pointers instead of objects, anyway.
- return &g_dbenvs.emplace(std::piecewise_construct, std::forward_as_tuple(env_directory.string()), std::forward_as_tuple(env_directory)).first->second;
+ auto inserted = g_dbenvs.emplace(env_directory.string(), std::weak_ptr<BerkeleyEnvironment>());
+ if (inserted.second) {
+ auto env = std::make_shared<BerkeleyEnvironment>(env_directory.string());
+ inserted.first->second = env;
+ return env;
+ }
+ return inserted.first->second.lock();
}
//
@@ -137,6 +147,7 @@ BerkeleyEnvironment::BerkeleyEnvironment(const fs::path& dir_path) : strPath(dir
BerkeleyEnvironment::~BerkeleyEnvironment()
{
+ g_dbenvs.erase(strPath);
Close();
}
@@ -214,10 +225,10 @@ bool BerkeleyEnvironment::Open(bool retry)
return true;
}
-void BerkeleyEnvironment::MakeMock()
+//! Construct an in-memory mock Berkeley environment for testing and as a place-holder for g_dbenvs emplace
+BerkeleyEnvironment::BerkeleyEnvironment()
{
- if (fDbEnvInit)
- throw std::runtime_error("BerkeleyEnvironment::MakeMock: Already initialized");
+ Reset();
boost::this_thread::interruption_point();
@@ -305,7 +316,7 @@ BerkeleyBatch::SafeDbt::operator Dbt*()
bool BerkeleyBatch::Recover(const fs::path& file_path, void *callbackDataIn, bool (*recoverKVcallback)(void* callbackData, CDataStream ssKey, CDataStream ssValue), std::string& newFilename)
{
std::string filename;
- BerkeleyEnvironment* env = GetWalletEnv(file_path, filename);
+ std::shared_ptr<BerkeleyEnvironment> env = GetWalletEnv(file_path, filename);
// Recovery procedure:
// move wallet file to walletfilename.timestamp.bak
@@ -374,7 +385,7 @@ bool BerkeleyBatch::Recover(const fs::path& file_path, void *callbackDataIn, boo
bool BerkeleyBatch::VerifyEnvironment(const fs::path& file_path, std::string& errorStr)
{
std::string walletFile;
- BerkeleyEnvironment* env = GetWalletEnv(file_path, walletFile);
+ std::shared_ptr<BerkeleyEnvironment> env = GetWalletEnv(file_path, walletFile);
fs::path walletDir = env->Directory();
LogPrintf("Using BerkeleyDB version %s\n", DbEnv::version(nullptr, nullptr, nullptr));
@@ -398,7 +409,7 @@ bool BerkeleyBatch::VerifyEnvironment(const fs::path& file_path, std::string& er
bool BerkeleyBatch::VerifyDatabaseFile(const fs::path& file_path, std::string& warningStr, std::string& errorStr, BerkeleyEnvironment::recoverFunc_type recoverFunc)
{
std::string walletFile;
- BerkeleyEnvironment* env = GetWalletEnv(file_path, walletFile);
+ std::shared_ptr<BerkeleyEnvironment> env = GetWalletEnv(file_path, walletFile);
fs::path walletDir = env->Directory();
if (fs::exists(walletDir / walletFile))
@@ -502,7 +513,7 @@ BerkeleyBatch::BerkeleyBatch(BerkeleyDatabase& database, const char* pszMode, bo
{
fReadOnly = (!strchr(pszMode, '+') && !strchr(pszMode, 'w'));
fFlushOnClose = fFlushOnCloseIn;
- env = database.env;
+ env = database.env.get();
if (database.IsDummy()) {
return;
}
@@ -559,7 +570,7 @@ BerkeleyBatch::BerkeleyBatch(BerkeleyDatabase& database, const char* pszMode, bo
// versions of BDB have an set_lk_exclusive method for this
// purpose, but the older version we use does not.)
for (const auto& env : g_dbenvs) {
- CheckUniqueFileid(env.second, strFilename, *pdb_temp, this->env->m_fileids[strFilename]);
+ CheckUniqueFileid(*env.second.lock().get(), strFilename, *pdb_temp, this->env->m_fileids[strFilename]);
}
pdb = pdb_temp.release();
@@ -660,7 +671,7 @@ bool BerkeleyBatch::Rewrite(BerkeleyDatabase& database, const char* pszSkip)
if (database.IsDummy()) {
return true;
}
- BerkeleyEnvironment *env = database.env;
+ BerkeleyEnvironment *env = database.env.get();
const std::string& strFile = database.strFile;
while (true) {
{
@@ -791,7 +802,7 @@ bool BerkeleyBatch::PeriodicFlush(BerkeleyDatabase& database)
return true;
}
bool ret = false;
- BerkeleyEnvironment *env = database.env;
+ BerkeleyEnvironment *env = database.env.get();
const std::string& strFile = database.strFile;
TRY_LOCK(cs_db, lockDb);
if (lockDb)