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/**
* Copyright (C) 2013 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/s/dbclient_multi_command.h"
#include "mongo/bson/mutable/document.h"
#include "mongo/db/audit.h"
#include "mongo/db/client_basic.h"
#include "mongo/db/dbmessage.h"
#include "mongo/db/wire_version.h"
#include "mongo/s/shard.h"
#include "mongo/s/write_ops/batched_command_request.h"
#include "mongo/db/server_parameters.h"
#include "mongo/util/net/message.h"
namespace mongo {
DBClientMultiCommand::PendingCommand::PendingCommand( const ConnectionString& endpoint,
const StringData& dbName,
const BSONObj& cmdObj ) :
endpoint( endpoint ),
dbName( dbName.toString() ),
cmdObj( cmdObj ),
conn( NULL ),
status( Status::OK() ) {
}
void DBClientMultiCommand::addCommand( const ConnectionString& endpoint,
const StringData& dbName,
const BSONSerializable& request ) {
PendingCommand* command = new PendingCommand( endpoint, dbName, request.toBSON() );
_pendingCommands.push_back( command );
}
namespace {
//
// For sanity checks of batch write operations
//
BatchedCommandRequest::BatchType getBatchWriteType( const BSONObj& cmdObj ) {
string cmdName = cmdObj.firstElement().fieldName();
if ( cmdName == "insert" ) return BatchedCommandRequest::BatchType_Insert;
if ( cmdName == "update" ) return BatchedCommandRequest::BatchType_Update;
if ( cmdName == "delete" ) return BatchedCommandRequest::BatchType_Delete;
return BatchedCommandRequest::BatchType_Unknown;
}
bool isBatchWriteCommand( const BSONObj& cmdObj ) {
return getBatchWriteType( cmdObj ) != BatchedCommandRequest::BatchType_Unknown;
}
bool hasBatchWriteFeature( DBClientBase* conn ) {
return conn->getMinWireVersion() <= BATCH_COMMANDS
&& conn->getMaxWireVersion() >= BATCH_COMMANDS;
}
}
// THROWS
static void sayAsCmd( DBClientBase* conn, const StringData& dbName, const BSONObj& cmdObj ) {
Message toSend;
BSONObjBuilder usersBuilder;
usersBuilder.appendElements(cmdObj);
audit::appendImpersonatedUsers(&usersBuilder);
// see query.h for the protocol we are using here.
BufBuilder bufB;
bufB.appendNum( 0 ); // command/query options
bufB.appendStr( dbName.toString() + ".$cmd" ); // write command ns
bufB.appendNum( 0 ); // ntoskip (0 for command)
bufB.appendNum( 1 ); // ntoreturn (1 for command)
usersBuilder.obj().appendSelfToBufBuilder( bufB );
toSend.setData( dbQuery, bufB.buf(), bufB.len() );
// Send our command
conn->say( toSend );
}
// THROWS
static void recvAsCmd( DBClientBase* conn, Message* toRecv, BSONObj* result ) {
if ( !conn->recv( *toRecv ) ) {
// Confusingly, socket exceptions here are written to the log, not thrown.
uasserted( 17255, "error receiving write command response, "
"possible socket exception - see logs" );
}
// A query result is returned from commands
QueryResult::View recvdQuery = toRecv->singleData().view2ptr();
*result = BSONObj( recvdQuery.data() );
}
void DBClientMultiCommand::sendAll() {
for ( deque<PendingCommand*>::iterator it = _pendingCommands.begin();
it != _pendingCommands.end(); ++it ) {
PendingCommand* command = *it;
dassert( NULL == command->conn );
try {
dassert( command->endpoint.type() == ConnectionString::MASTER ||
command->endpoint.type() == ConnectionString::CUSTOM );
// TODO: Fix the pool up to take millis directly
int timeoutSecs = _timeoutMillis / 1000;
command->conn = shardConnectionPool.get( command->endpoint, timeoutSecs );
// Sanity check if we're sending a batch write that we're talking to a new-enough
// server.
massert(28563, str::stream() << "cannot send batch write operation to server "
<< command->conn->toString(),
!isBatchWriteCommand(command->cmdObj) ||
hasBatchWriteFeature(command->conn));
sayAsCmd( command->conn, command->dbName, command->cmdObj );
}
catch ( const DBException& ex ) {
command->status = ex.toStatus();
if ( NULL != command->conn ) {
// Confusingly, the pool needs to know about failed connections so that it can
// invalidate other connections which might be bad. But if the connection
// doesn't seem bad, don't send it back, because we don't want to reuse it.
if ( !command->conn->isFailed() ) {
delete command->conn;
}
else {
shardConnectionPool.release( command->endpoint.toString(), command->conn );
}
command->conn = NULL;
}
}
}
}
int DBClientMultiCommand::numPending() const {
return static_cast<int>( _pendingCommands.size() );
}
Status DBClientMultiCommand::recvAny( ConnectionString* endpoint, BSONSerializable* response ) {
scoped_ptr<PendingCommand> command( _pendingCommands.front() );
_pendingCommands.pop_front();
*endpoint = command->endpoint;
if ( !command->status.isOK() ) return command->status;
dassert( NULL != command->conn );
try {
// Holds the data and BSONObj for the command result
Message toRecv;
BSONObj result;
recvAsCmd( command->conn, &toRecv, &result );
shardConnectionPool.release( command->endpoint.toString(), command->conn );
command->conn = NULL;
string errMsg;
if ( !response->parseBSON( result, &errMsg ) || !response->isValid( &errMsg ) ) {
return Status( ErrorCodes::FailedToParse, errMsg );
}
}
catch ( const DBException& ex ) {
// Confusingly, the pool needs to know about failed connections so that it can
// invalidate other connections which might be bad. But if the connection doesn't seem
// bad, don't send it back, because we don't want to reuse it.
if ( !command->conn->isFailed() ) {
delete command->conn;
}
else {
shardConnectionPool.release( command->endpoint.toString(), command->conn );
}
command->conn = NULL;
return ex.toStatus();
}
return Status::OK();
}
DBClientMultiCommand::~DBClientMultiCommand() {
// Cleanup anything outstanding, do *not* return stuff to the pool, that might error
for ( deque<PendingCommand*>::iterator it = _pendingCommands.begin();
it != _pendingCommands.end(); ++it ) {
PendingCommand* command = *it;
if ( NULL != command->conn ) delete command->conn;
delete command;
command = NULL;
}
_pendingCommands.clear();
}
void DBClientMultiCommand::setTimeoutMillis( int milliSecs ) {
_timeoutMillis = milliSecs;
}
}
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