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// dbclient.cpp - connect to a Mongo database as a client, from C++
/**
* 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 "stdafx.h"
#include "pdfile.h"
#include "dbclient.h"
#include "../util/builder.h"
#include "jsobj.h"
#include "query.h"
JSObj DBClientConnection::findOne(const char *ns, JSObj query, JSObj *fieldsToReturn) {
auto_ptr<DBClientCursor> c =
this->query(ns, query, 1, 0, fieldsToReturn);
if( !c->more() )
return JSObj();
return c->next().copy();
}
bool DBClientConnection::connect(const char *serverAddress, string& errmsg) {
/* not reentrant!
ok as used right now (we are in a big lock), but won't be later, so fix. */
int port = DBPort;
string ip = hostbyname_nonreentrant(serverAddress);
if( ip.empty() )
ip = serverAddress;
int idx = ip.find( ":" );
if ( idx != string::npos ){
cout << "port string:" << ip.substr( idx ) << endl;
port = atoi( ip.substr( idx + 1 ).c_str() );
ip = ip.substr( 0 , idx );
ip = hostbyname_nonreentrant(ip.c_str());
}
if( ip.empty() )
ip = serverAddress;
cout << "port:" << port << endl;
server = auto_ptr<SockAddr>(new SockAddr(ip.c_str(), port));
if( !p.connect(*server) ) {
errmsg = string("couldn't connect to server ") + serverAddress + ' ' + ip;
return false;
}
return true;
}
auto_ptr<DBClientCursor> DBClientConnection::query(const char *ns, JSObj query, int nToReturn, int nToSkip, JSObj *fieldsToReturn, bool tailable) {
// see query.h for the protocol we are using here.
BufBuilder b;
int opts = tailable ? Option_CursorTailable : 0;
b.append(opts);
b.append(ns);
b.append(nToSkip);
b.append(nToReturn);
query.appendSelfToBufBuilder(b);
if( fieldsToReturn )
fieldsToReturn->appendSelfToBufBuilder(b);
Message toSend;
toSend.setData(dbQuery, b.buf(), b.len());
auto_ptr<Message> response(new Message());
bool ok = p.call(toSend, *response);
if( !ok )
return auto_ptr<DBClientCursor>(0);
auto_ptr<DBClientCursor> c(new DBClientCursor(p, response, opts));
c->ns = ns;
c->nToReturn = nToReturn;
return c;
}
/* -- DBClientCursor ---------------------------------------------- */
void DBClientCursor::requestMore() {
cout << "TEMP REQUESTMORE" << endl;
assert( cursorId && pos == nReturned );
BufBuilder b;
b.append(opts);
b.append(ns.c_str());
b.append(nToReturn);
b.append(cursorId);
Message toSend;
toSend.setData(dbGetMore, b.buf(), b.len());
auto_ptr<Message> response(new Message());
bool ok = p.call(toSend, *response);
assert( ok );
m = response;
dataReceived();
}
void DBClientCursor::dataReceived() {
QueryResult *qr = (QueryResult *) m->data;
if( qr->resultOptions() & ResultOption_CursorNotFound ) {
// cursor id no longer valid at the server.
assert( qr->cursorId == 0 );
cursorId = 0; // 0 indicates no longer valid (dead)
}
if( cursorId == 0 ) {
// only set initially: we don't want to kill it on end of data
// if it's a tailable cursor
cursorId = qr->cursorId;
}
nReturned = qr->nReturned;
pos = 0;
data = qr->data();
assert( nReturned || cursorId == 0 );
}
bool DBClientCursor::more() {
if( pos < nReturned )
return true;
if( cursorId == 0 )
return false;
requestMore();
return pos < nReturned;
}
JSObj DBClientCursor::next() {
assert( more() );
pos++;
JSObj o(data);
data += o.objsize();
return o;
}
/* ------------------------------------------------------ */
// "./db testclient" to invoke
extern JSObj emptyObj;
void testClient() {
cout << "testClient()" << endl;
DBClientConnection c;
string err;
assert( c.connect("127.0.0.1", err) );
cout << "query foo.bar..." << endl;
auto_ptr<DBClientCursor> cursor =
c.query("foo.bar", emptyObj, 0, 0, 0, true);
DBClientCursor *cc = cursor.get();
while( 1 ) {
bool m = cc->more();
cout << "more: " << m << " dead:" << cc->isDead() << endl;
if( !m ) {
if( cc->isDead() )
cout << "cursor dead, stopping" << endl;
else {
cout << "Sleeping 10 seconds" << endl;
sleepsecs(10);
continue;
}
break;
}
cout << cc->next().toString() << endl;
}
}
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