LegacyReply::LegacyReply(const Message* message) : _message(std::move(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);
std::tie(_commandReply, _metadata) =
uassertStatusOK(rpc::upconvertReplyMetadata(BSONObj(qr.data())));
// Copy the bson array of documents from the message into
// a contiguous area of memory owned by _docBuffer so
// DocumentRange can be used to iterate over documents
auto cursorElem = _commandReply[LegacyReplyBuilder::kCursorTag];
if (cursorElem.eoo())
return;
BSONObj cursorObj = cursorElem.Obj();
auto firstBatchElem = cursorObj[LegacyReplyBuilder::kFirstBatchTag];
if (firstBatchElem.eoo())
return;
for (BSONObjIterator it(firstBatchElem.Obj()); it.more(); it.next()) {
invariant((*it).isABSONObj());
BSONObj doc = (*it).Obj();
doc.appendSelfToBufBuilder(_docBuffer);
}
const char* dataBegin = _docBuffer.buf();
const char* dataEnd = dataBegin + _docBuffer.len();
_outputDocs = DocumentRange(dataBegin, dataEnd);
return;
}
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::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 );
*/
}
void DBClientCursor::dataReceived( bool& retry, string& host ) {
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.
verify( qr.getCursorId() == 0 );
cursorId = 0; // 0 indicates no longer valid (dead)
if ( ! ( opts & QueryOption_CursorTailable ) )
throw UserException( 13127 , "getMore: cursor didn't exist on server, possible restart or timeout?" );
}
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();
_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 );
*/
}