bool DBClientCursor::peekError(BSONObj* error){
if( ! wasError ) return false;
vector<BSONObj> v;
peek(v, 1);
verify( v.size() == 1 );
verify( hasErrField( v[0] ) );
if( error ) *error = v[0].getOwned();
return true;
}
void DBClientReplicaSet::checkResponse( const char* data, int nReturned, bool* retry, string* targetHost ){
// For now, do exactly as we did before, so as not to break things. In general though, we
// should fix this so checkResponse has a more consistent contract.
if( ! retry ){
if( _lazyState._lastClient )
return _lazyState._lastClient->checkResponse( data, nReturned );
else
return checkMaster()->checkResponse( data, nReturned );
}
*retry = false;
if( targetHost && _lazyState._lastClient ) *targetHost = _lazyState._lastClient->getServerAddress();
else *targetHost = "";
if( ! _lazyState._lastClient ) return;
if( nReturned != 1 && nReturned != -1 ) return;
BSONObj dataObj;
if( nReturned == 1 ) dataObj = BSONObj( data );
// Check if we should retry here
if( _lazyState._lastOp == dbQuery && _lazyState._slaveOk ){
// Check the error code for a slave not secondary error
if( nReturned == -1 ||
( hasErrField( dataObj ) && ! dataObj["code"].eoo() && dataObj["code"].Int() == 13436 ) ){
bool wasMaster = false;
if( _lazyState._lastClient == _slave.get() ){
isntSecondary();
}
else if( _lazyState._lastClient == _master.get() ){
wasMaster = true;
isntMaster();
}
else
warning() << "passed " << dataObj << " but last rs client " << _lazyState._lastClient->toString() << " is not master or secondary" << endl;
if( _lazyState._retries < 3 ){
_lazyState._retries++;
*retry = true;
}
else{
// assert( wasMaster );
// printStackTrace();
log() << "too many retries (" << _lazyState._retries << "), could not get data from replica set" << endl;
}
}
}
}
bool DBClientCursor::peekError(BSONObj* error) {
if (!wasError)
return false;
vector<BSONObj> v;
peek(v, 1);
verify(v.size() == 1);
// We check both the legacy error format, and the new error format. hasErrField checks for
// $err, and getStatusFromCommandResult checks for modern errors of the form '{ok: 0.0, code:
// <...>, errmsg: ...}'.
verify(hasErrField(v[0]) || !getStatusFromCommandResult(v[0]).isOK());
if (error)
*error = v[0].getOwned();
return true;
}
void DBClientReplicaSet::checkResponse( const char* data, int nReturned, bool* retry, string* targetHost ){
// For now, do exactly as we did before, so as not to break things. In general though, we
// should fix this so checkResponse has a more consistent contract.
if( ! retry ){
if( _lazyState._lastClient )
return _lazyState._lastClient->checkResponse( data, nReturned );
else
return checkMaster()->checkResponse( data, nReturned );
}
*retry = false;
if( targetHost && _lazyState._lastClient ) *targetHost = _lazyState._lastClient->getServerAddress();
else if (targetHost) *targetHost = "";
if( ! _lazyState._lastClient ) return;
// nReturned == 1 means that we got one result back, which might be an error
// nReturned == -1 is a sentinel value for "no data returned" aka (usually) network problem
// If neither, this must be a query result so our response is ok wrt the replica set
if( nReturned != 1 && nReturned != -1 ) return;
BSONObj dataObj;
if( nReturned == 1 ) dataObj = BSONObj( data );
// Check if we should retry here
if( _lazyState._lastOp == dbQuery && _lazyState._secondaryQueryOk ){
// query could potentially go to a secondary, so see if this is an error (or empty) and
// retry if we're not past our retry limit.
if( nReturned == -1 /* no result, maybe network problem */ ||
( hasErrField( dataObj ) && ! dataObj["code"].eoo()
&& dataObj["code"].Int() == NotMasterOrSecondaryCode ) ){
if( _lazyState._lastClient == _lastSlaveOkConn.get() ){
isntSecondary();
}
else if( _lazyState._lastClient == _master.get() ){
isntMaster();
}
else {
warning() << "passed " << dataObj << " but last rs client "
<< _lazyState._lastClient->toString() << " is not master or secondary"
<< endl;
}
if ( _lazyState._retries < static_cast<int>( MAX_RETRY ) ) {
_lazyState._retries++;
*retry = true;
}
else{
log() << "too many retries (" << _lazyState._retries
<< "), could not get data from replica set" << endl;
}
}
}
else if( _lazyState._lastOp == dbQuery ){
// if query could not potentially go to a secondary, just mark the master as bad
if( nReturned == -1 /* no result, maybe network problem */ ||
( hasErrField( dataObj ) && ! dataObj["code"].eoo()
&& dataObj["code"].Int() == NotMasterNoSlaveOkCode ) )
{
if( _lazyState._lastClient == _master.get() ){
isntMaster();
}
}
}
}
