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/**
* Copyright (C) 2008 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/>.
*/
#include "storage.h"
#include "jsobj.h"
#include "namespace.h"
/* For the database/server protocol, these objects and functions encapsulate
the various messages transmitted over the connection.
*/
class DbMessage {
public:
DbMessage(const Message& _m) : m(_m) {
theEnd = _m.data->_data + _m.data->dataLen();
int *r = (int *) _m.data->_data;
reserved = *r;
r++;
data = (const char *) r;
nextjsobj = data;
}
const char * getns() { return data; }
void getns(Namespace& ns) {
ns = data;
}
int pullInt() {
if( nextjsobj == data )
nextjsobj += strlen(data) + 1; // skip namespace
int i = *((int *)nextjsobj);
nextjsobj += 4;
return i;
}
long long pullInt64() {
if( nextjsobj == data )
nextjsobj += strlen(data) + 1; // skip namespace
long long i = *((long long *)nextjsobj);
nextjsobj += 8;
return i;
}
OID* getOID() {
return (OID *) (data + strlen(data) + 1); // skip namespace
}
void getQueryStuff(const char *&query, int& ntoreturn) {
int *i = (int *) (data + strlen(data) + 1);
ntoreturn = *i;
i++;
query = (const char *) i;
}
/* for insert and update msgs */
bool moreJSObjs() { return nextjsobj != 0; }
BSONObj nextJsObj() {
if( nextjsobj == data )
nextjsobj += strlen(data) + 1; // skip namespace
BSONObj js(nextjsobj);
assert( js.objsize() < ( theEnd - data ) );
if( js.objsize() <= 0 )
nextjsobj = null;
else {
nextjsobj += js.objsize();
if( nextjsobj >= theEnd )
nextjsobj = 0;
}
return js;
}
const Message& msg() { return m; }
private:
const Message& m;
int reserved;
const char *data;
const char *nextjsobj;
const char *theEnd;
};
/* a request to run a query, received from the database */
class QueryMessage {
public:
const char *ns;
int ntoskip;
int ntoreturn;
int queryOptions;
BSONObj query;
auto_ptr< set<string> > fields;
/* parses the message into the above fields */
QueryMessage(DbMessage& d) {
ns = d.getns();
ntoskip = d.pullInt();
ntoreturn = d.pullInt();
query = d.nextJsObj();
if( d.moreJSObjs() ) {
fields = auto_ptr< set<string> >(new set<string>());
d.nextJsObj().getFieldNames(*fields);
}
queryOptions = d.msg().data->dataAsInt();
}
};
#include "../client/dbclient.h"
inline void replyToQuery(MessagingPort& p, Message& requestMsg,
void *data, int size,
int nReturned, int startingFrom = 0,
long long cursorId = 0
) {
BufBuilder b(32768);
b.skip(sizeof(QueryResult));
b.append(data, size);
QueryResult *qr = (QueryResult *) b.buf();
qr->_data[0] = 0;
qr->_data[1] = 0;
qr->_data[2] = 0;
qr->_data[3] = 0;
qr->len = b.len();
qr->setOperation(opReply);
qr->cursorId = cursorId;
qr->startingFrom = startingFrom;
qr->nReturned = 1;
b.decouple();
Message *resp = new Message();
resp->setData(qr, true); // transport will free
p.reply(requestMsg, *resp, requestMsg.data->id);
}
//#include "bsonobj.h"
inline void replyToQuery(MessagingPort& p, Message& requestMsg,
BSONObj& responseObj)
{
replyToQuery(
p, requestMsg,
(void *) responseObj.objdata(), responseObj.objsize(), 1);
}
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