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Add setAutoCommit method to the Transaction class #1459

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Add setAutoCommit method to the Transaction class #1459

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Add setAutoCommit method to the Transaction class
an-tao Dec 20, 2022
589e573
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an-tao Dec 21, 2022
0cee173
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an-tao Nov 28, 2023
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8 changes: 7 additions & 1 deletion orm_lib/inc/drogon/orm/DbClient.h
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Original file line number Diff line number Diff line change
Expand Up @@ -362,10 +362,16 @@ class Transaction : public DbClient
{
public:
virtual void rollback() = 0;
// virtual void commit() = 0;
virtual void commit(std::function<void(bool)> commitCallback) = 0;
virtual void setCommitCallback(
const std::function<void(bool)> &commitCallback) = 0;

/**
* @pref auto-commit or auto-rollback when the transaction object is
* destroyed; the default behavior is to commit.
*/
virtual void setAutoCommit(bool) = 0;

void closeAll() override
{
}
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84 changes: 73 additions & 11 deletions orm_lib/src/TransactionImpl.cc
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Expand Up @@ -41,25 +41,26 @@ TransactionImpl::~TransactionImpl()
auto loop = connectionPtr_->loop();
loop->queueInLoop([conn = connectionPtr_,
ucb = std::move(usedUpCallback_),
commitCb = std::move(commitCallback_)]() {
commitCb = std::move(commitCallback_),
autoCommit = autoCommit_]() {
Comment on lines +44 to +45
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UB if the user manually commits then auto commit happens. Could the following happen?

auto t = db->newTransactionCoro();
...
t->commit();
// now `t` destructs. Calls auto commit. We try to move an already moved variable.

conn->setIdleCallback([ucb = std::move(ucb)]() {
if (ucb)
ucb();
});
conn->execSql(
"commit",
autoCommit ? "commit" : "rollback",
0,
{},
{},
{},
[commitCb](const Result &) {
[commitCb, autoCommit](const Result &) {
LOG_TRACE << "Transaction committed!";
if (commitCb)
if (autoCommit && commitCb)
{
commitCb(true);
}
},
[commitCb](const std::exception_ptr &ePtr) {
[commitCb, autoCommit](const std::exception_ptr &ePtr) {
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Since this is the last time we use commitCb. We can move it instead of making a copy.

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Are the arguments evaluated in left-to-right order? If not, we can not use move.

try
{
std::rethrow_exception(ePtr);
Expand All @@ -68,7 +69,7 @@ TransactionImpl::~TransactionImpl()
{
LOG_ERROR << "Transaction submission failed:"
<< e.base().what();
if (commitCb)
if (autoCommit && commitCb)
{
commitCb(false);
}
Expand Down Expand Up @@ -150,6 +151,69 @@ void TransactionImpl::execSqlInLoop(
}
}

void TransactionImpl::commit(std::function<void(bool)> callback)
{
auto thisPtr = shared_from_this();
if (callback)
{
commitCallback_ = std::move(callback);
}
loop_->runInLoop([thisPtr]() {
if (thisPtr->isCommitedOrRolledback_)
return;
if (thisPtr->isWorking_)
{
// push sql cmd to buffer;
auto cmdPtr = std::make_shared<SqlCmd>();
cmdPtr->sql_ = "commit";
cmdPtr->parametersNumber_ = 0;
cmdPtr->callback_ = [thisPtr](const Result &) {
LOG_DEBUG << "Transaction commit!";
thisPtr->isCommitedOrRolledback_ = true;
if (thisPtr->commitCallback_)
{
thisPtr->commitCallback_(true);
}
};
cmdPtr->exceptionCallback_ = [thisPtr](const std::exception_ptr &) {
thisPtr->isCommitedOrRolledback_ = true;
if (thisPtr->commitCallback_)
{
thisPtr->commitCallback_(false);
}
LOG_ERROR << "Transaction commit error";
};
cmdPtr->isRollbackOrCommitCmd_ = true;
thisPtr->sqlCmdBuffer_.push_back(std::move(cmdPtr));
return;
}
thisPtr->isWorking_ = true;
thisPtr->thisPtr_ = thisPtr;
thisPtr->connectionPtr_->execSql(
"commit",
0,
{},
{},
{},
[thisPtr](const Result &) {
LOG_TRACE << "Transaction commit!";
thisPtr->isCommitedOrRolledback_ = true;
if (thisPtr->commitCallback_)
{
thisPtr->commitCallback_(true);
}
},
[thisPtr](const std::exception_ptr &) {
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Since this is the last place we used thisPtr. Can move move it to avid a copy?

LOG_ERROR << "Transaction commit error";
thisPtr->isCommitedOrRolledback_ = true;
if (thisPtr->commitCallback_)
{
thisPtr->commitCallback_(false);
}
});
});
}

void TransactionImpl::rollback()
{
auto thisPtr = shared_from_this();
Expand All @@ -172,7 +236,7 @@ void TransactionImpl::rollback()
thisPtr->isCommitedOrRolledback_ = true;
LOG_ERROR << "Transaction roll back error";
};
cmdPtr->isRollbackCmd_ = true;
cmdPtr->isRollbackOrCommitCmd_ = true;
// Rollback cmd should be executed firstly, so we push it in front
// of the list
thisPtr->sqlCmdBuffer_.push_front(std::move(cmdPtr));
Expand All @@ -189,10 +253,8 @@ void TransactionImpl::rollback()
[thisPtr](const Result &) {
LOG_TRACE << "Transaction roll back!";
thisPtr->isCommitedOrRolledback_ = true;
// clearupCb();
},
[thisPtr](const std::exception_ptr &) {
// clearupCb();
LOG_ERROR << "Transaction roll back error";
thisPtr->isCommitedOrRolledback_ = true;
});
Expand Down Expand Up @@ -220,15 +282,15 @@ void TransactionImpl::execNewTask()
std::move(cmd->formats_),
[callback = std::move(cmd->callback_), cmd, thisPtr](
const Result &r) {
if (cmd->isRollbackCmd_)
if (cmd->isRollbackOrCommitCmd_)
{
thisPtr->isCommitedOrRolledback_ = true;
}
if (callback)
callback(r);
},
[cmd, thisPtr](const std::exception_ptr &ePtr) {
if (!cmd->isRollbackCmd_)
if (!cmd->isRollbackOrCommitCmd_)
thisPtr->rollback();
else
{
Expand Down
10 changes: 9 additions & 1 deletion orm_lib/src/TransactionImpl.h
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Expand Up @@ -50,8 +50,16 @@ class TransactionImpl : public Transaction,
timeout_ = timeout;
}

void setAutoCommit(bool autoCommit) override
{
autoCommit_ = autoCommit;
}

void commit(std::function<void(bool)> callback) override;

private:
DbConnectionPtr connectionPtr_;
bool autoCommit_{true};

void execSql(const char *sql,
size_t sqlLength,
Expand Down Expand Up @@ -139,7 +147,7 @@ class TransactionImpl : public Transaction,
std::vector<int> formats_;
QueryCallback callback_;
ExceptPtrCallback exceptionCallback_;
bool isRollbackCmd_{false};
bool isRollbackOrCommitCmd_{false};
std::shared_ptr<TransactionImpl> thisPtr_;
};

Expand Down