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// instance.h : Global state functions.
//
/**
* 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/>.
*/
#pragma once
#include "../client/dbclient.h"
#include "curop.h"
#include "security.h"
#include "cmdline.h"
#include "client.h"
namespace mongo {
extern string dbExecCommand;
#define OPWRITE if( _diaglog.level & 1 ) _diaglog.write((char *) m.data, m.data->len);
#define OPREAD if( _diaglog.level & 2 ) _diaglog.readop((char *) m.data, m.data->len);
struct DiagLog {
ofstream *f;
/* 0 = off; 1 = writes, 2 = reads, 3 = both
7 = log a few reads, and all writes.
*/
int level;
DiagLog() : f(0) , level(0) { }
void init() {
if ( ! f && level ){
log() << "diagLogging = " << level << endl;
stringstream ss;
ss << "diaglog." << hex << time(0);
string name = ss.str();
f = new ofstream(name.c_str(), ios::out | ios::binary);
if ( ! f->good() ) {
problem() << "couldn't open log stream" << endl;
throw 1717;
}
}
}
/**
* @return old
*/
int setLevel( int newLevel ){
int old = level;
level = newLevel;
init();
return old;
}
void flush() {
if ( level ) f->flush();
}
void write(char *data,int len) {
if ( level & 1 ) f->write(data,len);
}
void readop(char *data, int len) {
if ( level & 2 ) {
bool log = (level & 4) == 0;
OCCASIONALLY log = true;
if ( log )
f->write(data,len);
}
}
};
extern DiagLog _diaglog;
/* we defer response until we unlock. don't want a blocked socket to
keep things locked.
*/
struct DbResponse {
Message *response;
MSGID responseTo;
DbResponse(Message *r, MSGID rt) : response(r), responseTo(rt) {
}
DbResponse() {
response = 0;
}
~DbResponse() {
delete response;
}
};
static SockAddr unknownAddress( "0.0.0.0", 0 );
bool assembleResponse( Message &m, DbResponse &dbresponse, const sockaddr_in &client = unknownAddress.sa );
void getDatabaseNames( vector< string > &names );
// must call with db lock
void registerListenerSocket( int socket );
// --- local client ---
class DBDirectClient : public DBClientBase {
public:
virtual auto_ptr<DBClientCursor> query(const string &ns, Query query, int nToReturn = 0, int nToSkip = 0,
const BSONObj *fieldsToReturn = 0, int queryOptions = 0);
virtual bool isFailed() const {
return false;
}
virtual string toString() {
return "DBDirectClient";
}
virtual string getServerAddress() const{
return "localhost"; // TODO: should this have the port?
}
virtual bool call( Message &toSend, Message &response, bool assertOk=true );
virtual void say( Message &toSend );
virtual void sayPiggyBack( Message &toSend ) {
// don't need to piggy back when connected locally
return say( toSend );
}
class AlwaysAuthorized : public AuthenticationInfo {
virtual bool isAuthorized( const char *dbname ) {
return true;
}
};
/* TODO: this looks bad that auth is set to always. is that really always safe? */
class SavedContext {
public:
SavedContext() {
Client *c = currentClient.get();
if ( c->database() ) {
/* note you must already be locked here or the database pointer could
be garbage as the db may have been dropped. there are definitely places
in the code where we are done with a db post setClient() and usage
and left the pointer set. if you called SavedContext thereafter unlocked,
that is unsafe, although the code was doing it for a long time.
Thus this assert is required. Ideally context would be nulled out when
done so we never have this problem.
*/
dbMutex.assertAtLeastReadLocked();
_oldName = c->database()->name;
}
oldAuth = c->ai;
// careful, don't want to free this:
c->ai = &always;
}
~SavedContext() {
Client *c = currentClient.get();
c->ai = oldAuth;
if ( !_oldName.empty() ) {
dbMutex.assertAtLeastReadLocked();
setClient( _oldName.c_str() );
}
}
private:
static AlwaysAuthorized always;
AuthenticationInfo *oldAuth;
string _oldName;
};
};
extern int lockFile;
void acquirePathLock();
} // namespace mongo
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