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A bit more checkpoint thread cleanup

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Just some additional error checking and moves the close of the db
to the main thread where it was opened.  Not required, but...
This commit is contained in:
Leland Lucius
2021-04-08 15:18:32 -05:00
parent 40d3a36296
commit b67c71688b
2 changed files with 159 additions and 145 deletions
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151
src/DBConnection.cpp
View File

@@ -47,6 +47,7 @@ DBConnection::DBConnection(
, mCallback{ std::move(callback) }
{
mDB = nullptr;
mCheckpointDB = nullptr;
mBypass = false;
}
@@ -133,46 +134,77 @@ int DBConnection::Open(const FilePath fileName)
wxASSERT(mDB == nullptr);
int rc;
rc = sqlite3_open(fileName.ToUTF8(), &mDB);
if (rc != SQLITE_OK)
{
wxLogMessage("Failed to open %s: %d, %s\n",
fileName,
rc,
sqlite3_errstr(rc));
sqlite3_close(mDB);
mDB = nullptr;
return rc;
}
// Set default mode
// (See comments in ProjectFileIO::SaveProject() about threading
SafeMode();
// Kick off the checkpoint thread
// Initalize checkpoint controls
mCheckpointStop = false;
mCheckpointPending = false;
mCheckpointActive = false;
// Open another connection to the DB to prevent blocking the main thread.
//
// If it fails, then we won't checkpoint until the main thread closes
// the associated DB.
sqlite3 *db = nullptr;
const auto name = sqlite3_db_filename(mDB, nullptr);
if (sqlite3_open(name, &db) == SQLITE_OK &&
// Configure it to be safe
ModeConfig(db, "main", SafeConfig) ) {
mCheckpointThread = std::thread([this, db]{ CheckpointThread(db); });
}
else
sqlite3_close(db);
const char *name = fileName.ToUTF8();
bool success = false;
rc = sqlite3_open(name, &mDB);
if (rc == SQLITE_OK)
{
// Set default mode
// (See comments in ProjectFileIO::SaveProject() about threading
if (SafeMode())
{
rc = sqlite3_open(name, &mCheckpointDB);
if (rc == SQLITE_OK)
{
// Set default mode
// (See comments in ProjectFileIO::SaveProject() about threading
if (SafeMode())
{
auto db = mCheckpointDB;
mCheckpointThread = std::thread([this, db, name]{ CheckpointThread(db, name); });
// Install our checkpoint hook
sqlite3_wal_hook(mDB, CheckpointHook, this);
success = true;
}
else
{
SetDBError(XO("Failed to set safe mode on checkpoint connection to %s").Format(fileName));
}
}
else
{
wxLogMessage("Failed to open checkpoint connection to %s: %d, %s\n",
fileName,
rc,
sqlite3_errstr(rc));
}
}
else
{
SetDBError(XO("Failed to set safe mode on primary connection to %s").Format(fileName));
}
}
else
{
wxLogMessage("Failed to open primary connection to %s: %d, %s\n",
fileName,
rc,
sqlite3_errstr(rc));
}
if (!success)
{
if (mCheckpointDB)
{
sqlite3_close(mCheckpointDB);
mCheckpointDB = nullptr;
}
if (mDB)
{
sqlite3_close(mDB);
mDB = nullptr;
}
}
return rc;
}
@@ -227,7 +259,9 @@ bool DBConnection::Close()
// And wait for it to do so
if (mCheckpointThread.joinable())
{
mCheckpointThread.join();
}
// We're done with the prepared statements
{
@@ -249,23 +283,28 @@ bool DBConnection::Close()
mStatements.clear();
}
// Close the DB
// Not much we can do if the closes fail, so just report the error
// Close the checkpoint connection
rc = sqlite3_close(mCheckpointDB);
if (rc != SQLITE_OK)
{
wxLogMessage("Failed to close checkpoint connection for %s\n"
"\tError: %s\n",
sqlite3_db_filename(mCheckpointDB, nullptr),
sqlite3_errmsg(mCheckpointDB));
}
mCheckpointDB = nullptr;
// Close the primary connection
rc = sqlite3_close(mDB);
if (rc != SQLITE_OK)
{
// I guess we could try to recover by repreparing statements and reinstalling
// the hook, but who knows if that would work either.
//
// Should we throw an error???
//
// LLL: Probably not worthwhile since the DB will just be recovered when
// next opened, but log it for diagnosis.
wxLogMessage("Failed to close %s\n"
"\tError: %s\n",
sqlite3_db_filename(mDB, nullptr),
sqlite3_errmsg(mDB));
}
mDB = nullptr;
return true;
@@ -387,14 +426,11 @@ sqlite3_stmt *DBConnection::Prepare(enum StatementID id, const char *sql)
return stmt;
}
void DBConnection::CheckpointThread(sqlite3 *db)
void DBConnection::CheckpointThread(sqlite3 *db, const char *name)
{
int rc = SQLITE_OK;
bool giveUp = false;
const char *name = nullptr;
if (db)
{
name = sqlite3_db_filename(db, nullptr);
while (true)
{
{
@@ -478,29 +514,6 @@ void DBConnection::CheckpointThread(sqlite3 *db)
);
}
}
}
else
{
wxLogMessage("Checkpoint thread failed to open %s\n"
"\tErrCode: %d\n"
"\tErrMsg: %s",
name,
rc,
sqlite3_errstr(rc));
}
// All done (always close)
if (db)
rc = sqlite3_close(db);
if (rc != SQLITE_OK && name)
{
wxLogMessage("Checkpoint thread failed to close %s\n"
"\tErrCode: %d\n"
"\tErrMsg: %s",
name,
rc,
sqlite3_errstr(rc));
}
return;
}

3
src/DBConnection.h
View File

@@ -98,12 +98,13 @@ public:
private:
bool ModeConfig(sqlite3 *db, const char *schema, const char *config);
void CheckpointThread(sqlite3 *db);
void CheckpointThread(sqlite3 *db, const char *name);
static int CheckpointHook(void *data, sqlite3 *db, const char *schema, int pages);
private:
std::weak_ptr<AudacityProject> mpProject;
sqlite3 *mDB;
sqlite3 *mCheckpointDB;
std::thread mCheckpointThread;
std::condition_variable mCheckpointCondition;