void DBClientCursor::dataReceived(bool& retry, string& host) {
// If this is a reply to our initial command request.
if (_isCommand && cursorId == 0) {
commandDataReceived();
return;
}
QueryResult::View qr = batch.m.singleData().view2ptr();
resultFlags = qr.getResultFlags();
if (qr.getResultFlags() & ResultFlag_ErrSet) {
wasError = true;
}
if (qr.getResultFlags() & ResultFlag_CursorNotFound) {
// cursor id no longer valid at the server.
invariant(qr.getCursorId() == 0);
if (!(opts & QueryOption_CursorTailable)) {
uasserted(13127,
str::stream() << "cursor id " << cursorId << " didn't exist on server.");
}
// 0 indicates no longer valid (dead)
cursorId = 0;
}
if (cursorId == 0 || !(opts & QueryOption_CursorTailable)) {
// only set initially: we don't want to kill it on end of data
// if it's a tailable cursor
cursorId = qr.getCursorId();
}
batch.nReturned = qr.getNReturned();
batch.pos = 0;
batch.data = qr.data();
batch.remainingBytes = qr.dataLen();
_client->checkResponse(batch.data, batch.nReturned, &retry, &host); // watches for "not master"
if (qr.getResultFlags() & ResultFlag_ShardConfigStale) {
BSONObj error;
verify(peekError(&error));
throw RecvStaleConfigException(
(string) "stale config on lazy receive" + causedBy(getErrField(error)), error);
}
/* this assert would fire the way we currently work:
verify( nReturned || cursorId == 0 );
*/
}
LegacyReply::LegacyReply(const Message* message) {
invariant(message->operation() == opReply);
QueryResult::View qr = message->singleData().view2ptr();
// should be checked by caller.
invariant(qr.msgdata().getNetworkOp() == opReply);
uassert(ErrorCodes::BadValue,
str::stream() << "Got legacy command reply with a bad cursorId field,"
<< " expected a value of 0 but got "
<< qr.getCursorId(),
qr.getCursorId() == 0);
uassert(ErrorCodes::BadValue,
str::stream() << "Got legacy command reply with a bad nReturned field,"
<< " expected a value of 1 but got "
<< qr.getNReturned(),
qr.getNReturned() == 1);
uassert(ErrorCodes::BadValue,
str::stream() << "Got legacy command reply with a bad startingFrom field,"
<< " expected a value of 0 but got "
<< qr.getStartingFrom(),
qr.getStartingFrom() == 0);
auto status = Validator<BSONObj>::validateLoad(qr.data(), qr.dataLen());
uassert(ErrorCodes::InvalidBSON,
str::stream() << "Got legacy command reply with invalid BSON in the metadata field"
<< causedBy(status),
status.isOK());
_commandReply = BSONObj(qr.data());
_commandReply.shareOwnershipWith(message->sharedBuffer());
if (_commandReply.firstElementFieldName() == "$err"_sd) {
// Upconvert legacy errors.
BSONObjBuilder bob;
bob.appendAs(_commandReply.firstElement(), "errmsg");
bob.append("ok", 0.0);
if (auto code = _commandReply["code"]) {
bob.append(code);
}
_commandReply = bob.obj();
}
return;
}
void DBClientCursor::commandDataReceived() {
int op = batch.m.operation();
invariant(op == opReply || op == dbCommandReply);
batch.nReturned = 1;
batch.pos = 0;
auto commandReply = rpc::makeReply(&batch.m);
auto commandStatus = getStatusFromCommandResult(commandReply->getCommandReply());
if (ErrorCodes::SendStaleConfig == commandStatus) {
throw RecvStaleConfigException("stale config in DBClientCursor::dataReceived()",
commandReply->getCommandReply());
} else if (!commandStatus.isOK()) {
wasError = true;
}
if (_client->getReplyMetadataReader()) {
uassertStatusOK(_client->getReplyMetadataReader()(commandReply->getMetadata(),
_client->getServerAddress()));
}
// HACK: If we got an OP_COMMANDREPLY, take the reply object
// and shove it in to an OP_REPLY message.
if (op == dbCommandReply) {
// Need to take ownership here as we destroy the underlying message.
BSONObj reply = commandReply->getCommandReply().getOwned();
batch.m.reset();
replyToQuery(0, batch.m, reply);
}
QueryResult::View qr = batch.m.singleData().view2ptr();
batch.data = qr.data();
batch.remainingBytes = qr.dataLen();
}
