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// dbmessage.cpp
/* Copyright 2009 10gen 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/platform/basic.h"
#include "mongo/db/dbmessage.h"
namespace mongo {
using std::string;
using std::stringstream;
string Message::toString() const {
stringstream ss;
ss << "op: " << opToString( operation() ) << " len: " << size();
if ( operation() >= 2000 && operation() < 2100 ) {
DbMessage d(*this);
ss << " ns: " << d.getns();
switch ( operation() ) {
case dbUpdate: {
int flags = d.pullInt();
BSONObj q = d.nextJsObj();
BSONObj o = d.nextJsObj();
ss << " flags: " << flags << " query: " << q << " update: " << o;
break;
}
case dbInsert:
ss << d.nextJsObj();
break;
case dbDelete: {
int flags = d.pullInt();
BSONObj q = d.nextJsObj();
ss << " flags: " << flags << " query: " << q;
break;
}
default:
ss << " CANNOT HANDLE YET";
}
}
return ss.str();
}
DbMessage::DbMessage(const Message& msg) : _msg(msg), _nsStart(NULL), _mark(NULL), _nsLen(0) {
// for received messages, Message has only one buffer
_theEnd = _msg.singleData().data() + _msg.singleData().dataLen();
_nextjsobj = _msg.singleData().data();
_reserved = readAndAdvance<int>();
// Read packet for NS
if (messageShouldHaveNs()) {
// Limit = buffer size of message -
// (first int4 in message which is either flags or a zero constant)
size_t limit = _msg.singleData().dataLen() - sizeof(int);
_nsStart = _nextjsobj;
_nsLen = strnlen(_nsStart, limit);
// Validate there is room for a null byte in the buffer
// Strings can be zero length
uassert(18633, "Failed to parse ns string", _nsLen < limit);
_nextjsobj += _nsLen + 1; // skip namespace + null
}
}
const char * DbMessage::getns() const {
verify(messageShouldHaveNs());
return _nsStart;
}
int DbMessage::getQueryNToReturn() const {
verify(messageShouldHaveNs());
const char* p = _nsStart + _nsLen + 1;
checkRead<int>(p, 2);
return ConstDataView(p).read<LittleEndian<int32_t>>(sizeof(int32_t));
}
int DbMessage::pullInt() {
return readAndAdvance<int32_t>();
}
long long DbMessage::pullInt64() {
return readAndAdvance<int64_t>();
}
const char* DbMessage::getArray(size_t count) const {
checkRead<long long>(_nextjsobj, count);
return _nextjsobj;
}
BSONObj DbMessage::nextJsObj() {
massert(10304,
"Client Error: Remaining data too small for BSON object",
_nextjsobj != NULL && _theEnd - _nextjsobj >= 5);
if (serverGlobalParams.objcheck) {
Status status = validateBSON(_nextjsobj, _theEnd - _nextjsobj);
massert(10307,
str::stream() << "Client Error: bad object in message: " << status.reason(),
status.isOK());
}
BSONObj js(_nextjsobj);
verify(js.objsize() >= 5);
verify(js.objsize() <= (_theEnd - _nextjsobj));
_nextjsobj += js.objsize();
if (_nextjsobj >= _theEnd)
_nextjsobj = NULL;
return js;
}
void DbMessage::markReset(const char * toMark = NULL) {
if (toMark == NULL) {
toMark = _mark;
}
verify(toMark);
_nextjsobj = toMark;
}
template<typename T>
void DbMessage::checkRead(const char* start, size_t count) const {
if ((_theEnd - start) < static_cast<int>(sizeof(T) * count)) {
uassert(18634, "Not enough data to read", false);
}
}
template<typename T>
T DbMessage::read() const {
checkRead<T>(_nextjsobj, 1);
return ConstDataView(_nextjsobj).read<LittleEndian<T>>();
}
template<typename T> T DbMessage::readAndAdvance() {
T t = read<T>();
_nextjsobj += sizeof(T);
return t;
}
void replyToQuery(int queryResultFlags,
AbstractMessagingPort* p, Message& requestMsg,
void *data, int size,
int nReturned, int startingFrom,
long long cursorId
) {
BufBuilder b(32768);
b.skip(sizeof(QueryResult::Value));
b.appendBuf(data, size);
QueryResult::View qr = b.buf();
qr.setResultFlags(queryResultFlags);
qr.msgdata().setLen(b.len());
qr.msgdata().setOperation(opReply);
qr.setCursorId(cursorId);
qr.setStartingFrom(startingFrom);
qr.setNReturned(nReturned);
b.decouple();
Message resp(qr.view2ptr(), true);
p->reply(requestMsg, resp, requestMsg.header().getId());
}
void replyToQuery(int queryResultFlags,
AbstractMessagingPort* p, Message& requestMsg,
const BSONObj& responseObj) {
replyToQuery(queryResultFlags,
p, requestMsg,
(void *) responseObj.objdata(), responseObj.objsize(), 1);
}
void replyToQuery( int queryResultFlags, Message &m, DbResponse &dbresponse, BSONObj obj ) {
Message *resp = new Message();
replyToQuery( queryResultFlags, *resp, obj );
dbresponse.response = resp;
dbresponse.responseTo = m.header().getId();
}
void replyToQuery( int queryResultFlags, Message& response, const BSONObj& resultObj ) {
BufBuilder bufBuilder;
bufBuilder.skip( sizeof( QueryResult::Value ));
bufBuilder.appendBuf( reinterpret_cast< void *>(
const_cast< char* >( resultObj.objdata() )), resultObj.objsize() );
QueryResult::View queryResult = bufBuilder.buf();
bufBuilder.decouple();
queryResult.setResultFlags(queryResultFlags);
queryResult.msgdata().setLen(bufBuilder.len());
queryResult.msgdata().setOperation( opReply );
queryResult.setCursorId(0);
queryResult.setStartingFrom(0);
queryResult.setNReturned(1);
response.setData( queryResult.view2ptr(), true ); // transport will free
}
}
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