bool run(OperationContext* txn, const string& dbname, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
LastError *le = lastError.disableForCommand();
le->appendSelf( result );
if ( le->valid )
result.append( "nPrev", le->nPrev );
else
result.append( "nPrev", -1 );
return true;
}
bool run(OperationContext* txn,
const string& db,
BSONObj& cmdObj,
int,
string& errmsg,
BSONObjBuilder& result,
bool fromRepl) {
LastError* le = lastError.get();
verify(le);
le->reset();
return true;
}
virtual bool run(const string& dbName, BSONObj& cmdObj, int, string& errmsg, BSONObjBuilder& result, bool) {
LastError *le = lastError.disableForCommand();
{
assert( le );
if ( le->msg.size() && le->nPrev == 1 ) {
le->appendSelf( result );
return true;
}
}
ClientInfo * client = ClientInfo::get();
return client->getLastError( cmdObj , result );
}
bool run(OperationContext* txn,
const string& dbname,
BSONObj& cmdObj,
int,
string& errmsg,
BSONObjBuilder& result) {
LastError *le = &LastError::get(txn->getClient());
le->disable();
le->appendSelf(result, true);
if (le->isValid())
result.append("nPrev", le->getNPrev());
else
result.append("nPrev", -1);
return true;
}
bool run(const string& dbname, BSONObj& _cmdObj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl) {
LastError *le = lastError.disableForCommand();
if ( le->nPrev != 1 ) {
LastError::noError.appendSelf( result , false );
le->appendSelfStatus( result );
}
else {
le->appendSelf( result , false );
}
Client& c = cc();
c.appendLastOp( result );
result.appendNumber( "connectionId" , c.getConnectionId() ); // for sharding; also useful in general for debugging
BSONObj cmdObj = _cmdObj;
{
BSONObj::iterator i(_cmdObj);
i.next();
if( !i.more() ) {
/* empty, use default */
BSONObj *def = getLastErrorDefault;
if( def )
cmdObj = *def;
}
}
WriteConcernOptions writeConcern;
Status status = writeConcern.parse( cmdObj );
if ( !status.isOK() ) {
result.append( "badGLE", cmdObj );
errmsg = status.toString();
return false;
}
WriteConcernResult res;
status = waitForWriteConcern( cc(), writeConcern, &res );
res.appendTo( &result );
if ( status.code() == ErrorCodes::WriteConcernLegacyOK ) {
result.append( "wnote", status.toString() );
return true;
}
return appendCommandStatus( result, status );
}
bool ClusterWriteCmd::run( const string& dbName,
BSONObj& cmdObj,
int options,
string& errMsg,
BSONObjBuilder& result,
bool ) {
BatchedCommandRequest request( _writeType );
BatchedCommandResponse response;
// TODO: if we do namespace parsing, push this to the type
if ( !request.parseBSON( cmdObj, &errMsg ) || !request.isValid( &errMsg ) ) {
// Batch parse failure
response.setOk( false );
response.setErrCode( ErrorCodes::FailedToParse );
response.setErrMessage( errMsg );
dassert( response.isValid( &errMsg ) );
}
else {
// Fixup the namespace to be a full ns internally
NamespaceString nss( dbName, request.getNS() );
request.setNS( nss.ns() );
clusterWrite( request, &response, true /* autosplit */ );
}
// Populate the lastError object based on the write
dassert( response.isValid( NULL ) );
LastError* lastErrorForRequest = lastError.get( true /* create */ );
dassert( lastErrorForRequest );
lastErrorForRequest->reset();
batchErrorToLastError( request, response, lastErrorForRequest );
// TODO
// There's a pending issue about how to report response here. If we use
// the command infra-structure, we should reuse the 'errmsg' field. But
// we have already filed that message inside the BatchCommandResponse.
// return response.getOk();
result.appendElements( response.toBSON() );
return true;
}
virtual void process( Message& m , AbstractMessagingPort* p ){
assert( p );
Request r( m , p );
LastError * le = lastError.startRequest( m , r.getClientId() );
assert( le );
if ( logLevel > 5 ){
log(5) << "client id: " << hex << r.getClientId() << "\t" << r.getns() << "\t" << dec << r.op() << endl;
}
try {
r.init();
setClientId( r.getClientId() );
r.process();
}
catch ( AssertionException & e ){
log( e.isUserAssertion() ? 1 : 0 ) << "AssertionException in process: " << e.what() << endl;
le->raiseError( e.getCode() , e.what() );
m.header()->id = r.id();
if ( r.expectResponse() ){
BSONObj err = BSON( "$err" << e.what() << "code" << e.getCode() );
replyToQuery( ResultFlag_ErrSet, p , m , err );
}
}
catch ( DBException& e ){
log() << "DBException in process: " << e.what() << endl;
le->raiseError( e.getCode() , e.what() );
m.header()->id = r.id();
if ( r.expectResponse() ){
BSONObj err = BSON( "$err" << e.what() << "code" << e.getCode() );
replyToQuery( ResultFlag_ErrSet, p , m , err );
}
}
}
virtual bool run(const string& dbName, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool) {
LastError *le = lastError.disableForCommand();
{
assert( le );
if ( le->msg.size() && le->nPrev == 1 ){
le->appendSelf( result );
return true;
}
}
ClientInfo * client = ClientInfo::get();
set<string> * shards = client->getPrev();
if ( shards->size() == 0 ){
result.appendNull( "err" );
return true;
}
//log() << "getlasterror enter: " << shards->size() << endl;
vector<OID> writebacks;
// handle single server
if ( shards->size() == 1 ){
string theShard = *(shards->begin() );
result.append( "theshard" , theShard.c_str() );
ShardConnection conn( theShard , "" );
BSONObj res;
bool ok = conn->runCommand( dbName , cmdObj , res );
//log() << "\t" << res << endl;
result.appendElements( res );
conn.done();
result.append( "singleShard" , theShard );
addWriteBack( writebacks , res );
// hit other machines just to block
for ( set<string>::const_iterator i=client->sinceLastGetError().begin(); i!=client->sinceLastGetError().end(); ++i ){
string temp = *i;
if ( temp == theShard )
continue;
ShardConnection conn( temp , "" );
addWriteBack( writebacks , conn->getLastErrorDetailed() );
conn.done();
}
client->clearSinceLastGetError();
handleWriteBacks( writebacks );
return ok;
}
BSONArrayBuilder bbb( result.subarrayStart( "shards" ) );
long long n = 0;
// hit each shard
vector<string> errors;
vector<BSONObj> errorObjects;
for ( set<string>::iterator i = shards->begin(); i != shards->end(); i++ ){
string theShard = *i;
bbb.append( theShard );
ShardConnection conn( theShard , "" );
BSONObj res;
bool ok = conn->runCommand( dbName , cmdObj , res );
addWriteBack( writebacks, res );
string temp = DBClientWithCommands::getLastErrorString( res );
if ( ok == false || temp.size() ){
errors.push_back( temp );
errorObjects.push_back( res );
}
n += res["n"].numberLong();
conn.done();
}
bbb.done();
result.appendNumber( "n" , n );
// hit other machines just to block
for ( set<string>::const_iterator i=client->sinceLastGetError().begin(); i!=client->sinceLastGetError().end(); ++i ){
string temp = *i;
if ( shards->count( temp ) )
continue;
ShardConnection conn( temp , "" );
addWriteBack( writebacks, conn->getLastErrorDetailed() );
conn.done();
}
client->clearSinceLastGetError();
if ( errors.size() == 0 ){
result.appendNull( "err" );
handleWriteBacks( writebacks );
return true;
}
result.append( "err" , errors[0].c_str() );
{ // errs
BSONArrayBuilder all( result.subarrayStart( "errs" ) );
for ( unsigned i=0; i<errors.size(); i++ ){
all.append( errors[i].c_str() );
}
all.done();
}
{ // errObjects
BSONArrayBuilder all( result.subarrayStart( "errObjects" ) );
for ( unsigned i=0; i<errorObjects.size(); i++ ){
all.append( errorObjects[i] );
}
all.done();
}
handleWriteBacks( writebacks );
return true;
}
bool run(OperationContext* txn, const string& dbname,
BSONObj& cmdObj,
int,
string& errmsg,
BSONObjBuilder& result,
bool fromRepl ) {
//
// Correct behavior here is very finicky.
//
// 1. The first step is to append the error that occurred on the previous operation.
// This adds an "err" field to the command, which is *not* the command failing.
//
// 2. Next we parse and validate write concern options. If these options are invalid
// the command fails no matter what, even if we actually had an error earlier. The
// reason for checking here is to match legacy behavior on these kind of failures -
// we'll still get an "err" field for the write error.
//
// 3. If we had an error on the previous operation, we then return immediately.
//
// 4. Finally, we actually enforce the write concern. All errors *except* timeout are
// reported with ok : 0.0, to match legacy behavior.
//
// There is a special case when "wOpTime" and "wElectionId" are explicitly provided by
// the client (mongos) - in this case we *only* enforce the write concern if it is
// valid.
//
// We always need to either report "err" (if ok : 1) or "errmsg" (if ok : 0), even if
// err is null.
//
LastError *le = lastError.disableForCommand();
// Always append lastOp and connectionId
Client& c = cc();
c.appendLastOp( result );
// for sharding; also useful in general for debugging
result.appendNumber( "connectionId" , c.getConnectionId() );
OpTime lastOpTime;
BSONField<OpTime> wOpTimeField("wOpTime");
FieldParser::FieldState extracted = FieldParser::extract(cmdObj, wOpTimeField,
&lastOpTime, &errmsg);
if (!extracted) {
result.append("badGLE", cmdObj);
appendCommandStatus(result, false, errmsg);
return false;
}
bool lastOpTimePresent = extracted != FieldParser::FIELD_NONE;
if (!lastOpTimePresent) {
// Use the client opTime if no wOpTime is specified
lastOpTime = cc().getLastOp();
}
OID electionId;
BSONField<OID> wElectionIdField("wElectionId");
extracted = FieldParser::extract(cmdObj, wElectionIdField,
&electionId, &errmsg);
if (!extracted) {
result.append("badGLE", cmdObj);
appendCommandStatus(result, false, errmsg);
return false;
}
bool electionIdPresent = extracted != FieldParser::FIELD_NONE;
bool errorOccurred = false;
// Errors aren't reported when wOpTime is used
if ( !lastOpTimePresent ) {
if ( le->nPrev != 1 ) {
errorOccurred = LastError::noError.appendSelf( result, false );
le->appendSelfStatus( result );
}
else {
errorOccurred = le->appendSelf( result, false );
}
}
BSONObj writeConcernDoc = cmdObj;
// Use the default options if we have no gle options aside from wOpTime/wElectionId
const int nFields = cmdObj.nFields();
bool useDefaultGLEOptions = (nFields == 1) ||
(nFields == 2 && lastOpTimePresent) ||
(nFields == 3 && lastOpTimePresent && electionIdPresent);
if ( useDefaultGLEOptions && getLastErrorDefault ) {
writeConcernDoc = *getLastErrorDefault;
}
//
// Validate write concern no matter what, this matches 2.4 behavior
//
WriteConcernOptions writeConcern;
Status status = writeConcern.parse( writeConcernDoc );
if ( status.isOK() ) {
// Ensure options are valid for this host
status = validateWriteConcern( writeConcern );
}
if ( !status.isOK() ) {
result.append( "badGLE", writeConcernDoc );
return appendCommandStatus( result, status );
}
// Don't wait for replication if there was an error reported - this matches 2.4 behavior
if ( errorOccurred ) {
dassert( !lastOpTimePresent );
return true;
}
// No error occurred, so we won't duplicate these fields with write concern errors
dassert( result.asTempObj()["err"].eoo() );
dassert( result.asTempObj()["code"].eoo() );
// If we got an electionId, make sure it matches
if (electionIdPresent) {
if (!theReplSet) {
// Ignore electionIds of 0 from mongos.
if (electionId != OID()) {
errmsg = "wElectionId passed but no replication active";
result.append("code", ErrorCodes::BadValue);
return false;
}
}
else {
if (electionId != theReplSet->getElectionId()) {
LOG(3) << "oid passed in is " << electionId
<< ", but our id is " << theReplSet->getElectionId();
errmsg = "election occurred after write";
result.append("code", ErrorCodes::WriteConcernFailed);
return false;
}
}
}
cc().curop()->setMessage( "waiting for write concern" );
WriteConcernResult wcResult;
status = waitForWriteConcern( txn, writeConcern, lastOpTime, &wcResult );
wcResult.appendTo( writeConcern, &result );
// For backward compatibility with 2.4, wtimeout returns ok : 1.0
if ( wcResult.wTimedOut ) {
dassert( !wcResult.err.empty() ); // so we always report err
dassert( !status.isOK() );
result.append( "errmsg", "timed out waiting for slaves" );
result.append( "code", status.code() );
return true;
}
return appendCommandStatus( result, status );
}
bool ClusterWriteCmd::run(OperationContext* txn, const string& dbName,
BSONObj& cmdObj,
int options,
string& errMsg,
BSONObjBuilder& result,
bool ) {
BatchedCommandRequest request( _writeType );
BatchedCommandResponse response;
ClusterWriter writer( true /* autosplit */, 0 /* timeout */ );
// NOTE: Sometimes this command is invoked with LE disabled for legacy writes
LastError* cmdLastError = lastError.get( false );
{
// Disable the last error object for the duration of the write
LastError::Disabled disableLastError( cmdLastError );
// TODO: if we do namespace parsing, push this to the type
if ( !request.parseBSON( cmdObj, &errMsg ) || !request.isValid( &errMsg ) ) {
// Batch parse failure
response.setOk( false );
response.setErrCode( ErrorCodes::FailedToParse );
response.setErrMessage( errMsg );
}
else {
// Fixup the namespace to be a full ns internally
NamespaceString nss( dbName, request.getNS() );
request.setNS( nss.ns() );
writer.write( request, &response );
}
dassert( response.isValid( NULL ) );
}
if ( cmdLastError ) {
// Populate the lastError object based on the write response
cmdLastError->reset();
batchErrorToLastError( request, response, cmdLastError );
}
size_t numAttempts;
if ( !response.getOk() ) {
numAttempts = 0;
} else if ( request.getOrdered() && response.isErrDetailsSet() ) {
numAttempts = response.getErrDetailsAt(0)->getIndex() + 1; // Add one failed attempt
} else {
numAttempts = request.sizeWriteOps();
}
// TODO: increase opcounters by more than one
if ( _writeType == BatchedCommandRequest::BatchType_Insert ) {
for( size_t i = 0; i < numAttempts; ++i ) {
globalOpCounters.gotInsert();
}
} else if ( _writeType == BatchedCommandRequest::BatchType_Update ) {
for( size_t i = 0; i < numAttempts; ++i ) {
globalOpCounters.gotUpdate();
}
} else if ( _writeType == BatchedCommandRequest::BatchType_Delete ) {
for( size_t i = 0; i < numAttempts; ++i ) {
globalOpCounters.gotDelete();
}
}
// Save the last opTimes written on each shard for this client, to allow GLE to work
if ( ClientInfo::exists() && writer.getStats().hasShardStats() ) {
ClientInfo* clientInfo = ClientInfo::get( NULL );
clientInfo->addHostOpTimes( writer.getStats().getShardStats().getWriteOpTimes() );
}
// TODO
// There's a pending issue about how to report response here. If we use
// the command infra-structure, we should reuse the 'errmsg' field. But
// we have already filed that message inside the BatchCommandResponse.
// return response.getOk();
result.appendElements( response.toBSON() );
return true;
}
