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🐎 6% faster sendfunds

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This commit is contained in:
EntireTwix 2021-06-19 15:19:44 -07:00
parent a08d53bf34
commit 2dc1c0c369
1 changed files with 50 additions and 53 deletions
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103
src/bank.cpp
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@ -75,81 +75,78 @@ int_fast8_t Bank::SendFunds(const std::string &a_name, const std::string &b_name
return ErrorResponse::InvalidRequest;
}
//as first modify_if checks a_name and grabs unique lock
if (!Contains(b_name))
if (!Contains(b_name) || !Contains(a_name))
{
return ErrorResponse::UserNotFound;
}
int_fast8_t state = false;
{
std::shared_lock<std::shared_mutex> lock{send_funds_l}; //because SendFunds requires 3 locking operations
if (!users.modify_if(a_name, [&state, amount, &attempt](User &a) {
//if A exists, A can afford it, and A's password matches
if constexpr (max_log_size > 0)
{
Transaction temp(a_name, b_name, amount);
std::shared_lock<std::shared_mutex> lock{send_funds_l};
users.modify_if(a_name, [&temp, &state, amount, &attempt](User &a) {
//if A can afford it and A's password matches attempt
if (a.balance < amount)
{
state = ErrorResponse::InsufficientFunds;
}
else if (a.password != XXH3_64bits(attempt.data(), attempt.size()))
{
state = ErrorResponse::WrongPassword;
}
else
{
if (a.password != XXH3_64bits(attempt.data(), attempt.size()))
{
state = ErrorResponse::WrongPassword;
}
else
{
a.balance -= amount;
state = true;
}
a.balance -= amount;
a.log.AddTrans(std::forward<Transaction>(temp));
state = true;
}
}))
{
return ErrorResponse::UserNotFound;
}
else
{
if (!state > 0)
});
if (state > 0)
{
return state;
users.modify_if(b_name, [&a_name, &b_name, &temp, amount](User &b) {
b.balance += amount;
b.log.AddTrans(std::move(temp));
});
return true;
}
else
{
if constexpr (max_log_size > 0)
return state;
}
}
else
{
std::shared_lock<std::shared_mutex> lock{send_funds_l};
users.modify_if(a_name, [&state, amount, &attempt](User &a) {
//if A can afford it and A's password matches attempt
if (a.balance < amount)
{
Transaction temp;
//if B does exist
if (!users.modify_if(b_name, [&a_name, &b_name, &temp, amount](User &b) {
temp = Transaction(a_name, b_name, amount);
b.balance += amount;
b.log.AddTrans(std::forward<Transaction>(temp));
}))
{
//attempt to refund if A exist
users.modify_if(a_name, [amount](User &a) {
a.balance += amount;
});
return ErrorResponse::UserNotFound; //because had to refund transaction
}
else
{
users.modify_if(a_name, [&temp](User &a) {
a.log.AddTrans(std::move(temp));
});
return true;
}
state = ErrorResponse::InsufficientFunds;
}
else if (a.password != XXH3_64bits(attempt.data(), attempt.size()))
{
state = ErrorResponse::WrongPassword;
}
else
{
if (!users.modify_if(b_name, [amount](User &b) {
b.balance += amount;
}))
{
//attempt to refund if A exist
users.modify_if(a_name, [amount](User &a) {
a.balance += amount;
});
return ErrorResponse::UserNotFound; //because had to refund transaction
}
a.balance -= amount;
state = true;
}
});
if (state > 0)
{
users.modify_if(b_name, [&a_name, &b_name, amount](User &b) {
b.balance += amount;
});
return true;
}
else
{
return state;
}
}
}