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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-inl.h"
#include "security.h"
#include "cmdline.h"
#include "client.h"
namespace mongo {
extern string dbExecCommand;
/** a high level recording of operations to the database - sometimes used for diagnostics
and debugging.
*/
class DiagLog {
ofstream *f; // note this is never freed
/* 0 = off; 1 = writes, 2 = reads, 3 = both
7 = log a few reads, and all writes.
*/
int level;
mongo::mutex mutex;
void openFile() {
assert( f == 0 );
stringstream ss;
ss << dbpath << "/diaglog." << hex << time(0);
string name = ss.str();
f = new ofstream(name.c_str(), ios::out | ios::binary);
if ( ! f->good() ) {
problem() << "diagLogging couldn't open " << name << endl;
// todo what is this? :
throw 1717;
}
else {
log() << "diagLogging using file " << name << endl;
}
}
public:
DiagLog() : f(0) , level(0), mutex("DiagLog") { }
int getLevel() const { return level; }
/**
* @return old
*/
int setLevel( int newLevel ) {
scoped_lock lk(mutex);
int old = level;
log() << "diagLogging level=" << newLevel << endl;
if( f == 0 ) {
openFile();
}
level = newLevel; // must be done AFTER f is set
return old;
}
void flush() {
if ( level ) {
log() << "flushing diag log" << endl;
scoped_lock lk(mutex);
f->flush();
}
}
void write(char *data,int len) {
if ( level & 1 ) {
scoped_lock lk(mutex);
f->write(data,len);
}
}
void readop(char *data, int len) {
if ( level & 2 ) {
bool log = (level & 4) == 0;
OCCASIONALLY log = true;
if ( log ) {
scoped_lock lk(mutex);
assert( f );
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;
const char *exhaust; /* points to ns if exhaust mode. 0=normal mode*/
DbResponse(Message *r, MSGID rt) : response(r), responseTo(rt), exhaust(0) { }
DbResponse() {
response = 0;
exhaust = 0;
}
~DbResponse() { delete response; }
};
void assembleResponse( Message &m, DbResponse &dbresponse, const HostAndPort &client );
void getDatabaseNames( vector< string > &names , const string& usePath = dbpath );
/* returns true if there is no data on this server. useful when starting replication.
local database does NOT count.
*/
bool replHasDatabases();
/** "embedded" calls to the local server directly.
Caller does not need to lock, that is handled within.
*/
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 , string * actualServer = 0 );
virtual void say( Message &toSend, bool isRetry = false );
virtual void sayPiggyBack( Message &toSend ) {
// don't need to piggy back when connected locally
return say( toSend );
}
virtual void killCursor( long long cursorID );
virtual bool callRead( Message& toSend , Message& response ) {
return call( toSend , response );
}
virtual unsigned long long count(const string &ns, const BSONObj& query = BSONObj(), int options=0, int limit=0, int skip=0 );
virtual ConnectionString::ConnectionType type() const { return ConnectionString::MASTER; }
double getSoTimeout() const { return 0; }
virtual bool lazySupported() const { return true; }
private:
static HostAndPort _clientHost;
};
extern int lockFile;
#ifdef _WIN32
extern HANDLE lockFileHandle;
#endif
void acquirePathLock(bool doingRepair=false); // if doingRepair=true don't consider unclean shutdown an error
void maybeCreatePidFile();
} // namespace mongo
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