BookListeners::pointer OrderBookDB::makeBookListeners (Book const& book)
{
ScopedLockType sl (mLock);
auto ret = getBookListeners (book);
if (!ret)
{
ret = std::make_shared<BookListeners> ();
mListeners [book] = ret;
assert (getBookListeners (book) == ret);
}
return ret;
}
BookListeners::pointer OrderBookDB::makeBookListeners (Book const& book)
{
std::lock_guard <std::recursive_mutex> sl (mLock);
auto ret = getBookListeners (book);
if (!ret)
{
ret = std::make_shared<BookListeners> ();
mListeners [book] = ret;
assert (getBookListeners (book) == ret);
}
return ret;
}
// Based on the meta, send the meta to the streams that are listening.
// We need to determine which streams a given meta effects.
void OrderBookDB::processTxn (
Ledger::ref ledger, const AcceptedLedgerTx& alTx, Json::Value const& jvObj)
{
ScopedLockType sl (mLock);
if (alTx.getResult () == tesSUCCESS)
{
// Check if this is an offer or an offer cancel or a payment that
// consumes an offer.
// Check to see what the meta looks like.
for (auto& node : alTx.getMeta ()->getNodes ())
{
try
{
if (node.getFieldU16 (sfLedgerEntryType) == ltOFFER)
{
SField const* field = nullptr;
// We need a field that contains the TakerGets and TakerPays
// parameters.
if (node.getFName () == sfModifiedNode)
field = &sfPreviousFields;
else if (node.getFName () == sfCreatedNode)
field = &sfNewFields;
else if (node.getFName () == sfDeletedNode)
field = &sfFinalFields;
if (field)
{
auto data = dynamic_cast<const STObject*> (
node.peekAtPField (*field));
if (data)
{
// determine the OrderBook
auto listeners = getBookListeners (
{data->getFieldAmount (sfTakerGets).issue(),
data->getFieldAmount (sfTakerPays).issue()});
if (listeners)
listeners->publish (jvObj);
}
}
}
}
catch (...)
{
WriteLog (lsINFO, OrderBookDB)
<< "Fields not found in OrderBookDB::processTxn";
}
}
}
}
// Based on the meta, send the meta to the streams that are listening.
// We need to determine which streams a given meta effects.
void OrderBookDB::processTxn (
std::shared_ptr<ReadView const> const& ledger,
const AcceptedLedgerTx& alTx)
{
std::lock_guard <std::recursive_mutex> sl (mLock);
Json::Value jvObj;
bool bJvObjInitialized = false;
if (alTx.getResult () == tesSUCCESS)
{
std::set<BookListeners::pointer> listenersSet;
// Check if this is an offer or an offer cancel or a payment that
// consumes an offer.
// Check to see what the meta looks like.
for (auto& node : alTx.getMeta ()->getNodes ())
{
try
{
if (node.getFieldU16 (sfLedgerEntryType) == ltOFFER)
{
SField const* field = nullptr;
// We need a field that contains the TakerGets and TakerPays
// parameters.
if (node.getFName () == sfModifiedNode)
field = &sfPreviousFields;
else if (node.getFName () == sfCreatedNode)
field = &sfNewFields;
else if (node.getFName () == sfDeletedNode)
field = &sfFinalFields;
if (field)
{
auto data = dynamic_cast<const STObject*> (
node.peekAtPField (*field));
if (data &&
data->isFieldPresent (sfTakerPays) &&
data->isFieldPresent (sfTakerGets))
{
// determine the OrderBook
auto listeners = getBookListeners (
{data->getFieldAmount (sfTakerGets).issue(),
data->getFieldAmount (sfTakerPays).issue()});
if (listeners)
{
listenersSet.insert(listeners);
}
}
}
}
}
catch (std::exception const&)
{
JLOG (j_.info)
<< "Fields not found in OrderBookDB::processTxn";
}
}
for (auto& listeners: listenersSet)
{
if (!bJvObjInitialized)
{
jvObj = NetworkOPs_transJson (*alTx.getTxn (), alTx.getResult (), true, ledger, app_);
jvObj[jss::meta] = alTx.getMeta ()->getJson (0);
bJvObjInitialized = true;
}
listeners->publish (jvObj);
}
}
}
