Status _findAllCollections(const ConnectionString& configLoc,
bool optionalEpochs,
OwnedPointerMap<string, CollectionType>* collections)
{
scoped_ptr<ScopedDbConnection> connPtr;
try {
connPtr.reset(ScopedDbConnection::getInternalScopedDbConnection(configLoc, 30));
ScopedDbConnection& conn = *connPtr;
scoped_ptr<DBClientCursor> cursor(_safeCursor(conn->query(CollectionType::ConfigNS,
Query())));
while (cursor->more()) {
BSONObj collDoc = cursor->nextSafe();
CollectionType* coll = new CollectionType();
string errMsg;
coll->parseBSON(collDoc, &errMsg);
// Needed for the v3 to v4 upgrade
bool epochNotSet = !coll->isEpochSet() || !coll->getEpoch().isSet();
if (optionalEpochs && epochNotSet) {
// Set our epoch to something here, just to allow
coll->setEpoch(OID::gen());
}
if (errMsg != "" || !coll->isValid(&errMsg)) {
return Status(ErrorCodes::UnsupportedFormat,
stream() << "invalid collection " << collDoc
<< " read from the config server" << causedBy(errMsg));
}
if (coll->isDroppedSet() && coll->getDropped()) {
continue;
}
if (optionalEpochs && epochNotSet) {
coll->setEpoch(OID());
}
collections->mutableMap().insert(make_pair(coll->getNS(), coll));
}
}
catch (const DBException& e) {
return e.toStatus();
}
connPtr->done();
return Status::OK();
}
