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// @file s/client_info.h
/*
* Copyright (C) 2010 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 here.
*/
#pragma once
#include "mongo/pch.h"
#include "mongo/db/client_basic.h"
#include "mongo/s/chunk.h"
#include "mongo/s/writeback_listener.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
class AbstractMessagingPort;
/**
* holds information about a client connected to a mongos
* 1 per client socket
* currently implemented with a thread local
*/
class ClientInfo : public ClientBasic {
public:
ClientInfo(AbstractMessagingPort* messagingPort);
~ClientInfo();
/** new request on behalf of a client, adjusts internal state */
void newPeerRequest( const HostAndPort& peer );
/** new request not associated (yet or ever) with a client */
void newRequest();
/** client disconnected */
void disconnect();
bool hasRemote() const { return true; }
/**
* @return remote socket address of the client
*/
HostAndPort getRemote() const { return _remote; }
/**
* notes that this client use this shard
* keeps track of all shards accessed this request
*/
void addShard( const string& shard );
/**
* gets shards used on the previous request
*/
set<string> * getPrev() const { return _prev; };
/**
* gets all shards we've accessed since the last time we called clearSinceLastGetError
*/
const set<string>& sinceLastGetError() const { return _sinceLastGetError; }
/**
* clears list of shards we've talked to
*/
void clearSinceLastGetError() { _sinceLastGetError.clear(); }
/**
* resets the list of shards using to process the current request
*/
void clearCurrentShards(){ _cur->clear(); }
void disableForCommand();
/**
* calls getLastError
* resets shards since get last error
* @return if the command was ok or if there was an error
*/
bool getLastError( const string& dbName,
const BSONObj& options ,
BSONObjBuilder& result ,
string& errmsg,
bool fromWriteBackListener = false );
/** @return if its ok to auto split from this client */
bool autoSplitOk() const { return _autoSplitOk && Chunk::ShouldAutoSplit; }
void noAutoSplit() { _autoSplitOk = false; }
// Returns whether or not a ClientInfo for this thread has already been created and stored
// in _tlInfo.
static bool exists();
// Gets the ClientInfo object for this thread from _tlInfo. If no ClientInfo object exists
// yet for this thread, it creates one.
static ClientInfo * get(AbstractMessagingPort* messagingPort = NULL);
// Creates a ClientInfo and stores it in _tlInfo
static ClientInfo* create(AbstractMessagingPort* messagingPort);
private:
struct WBInfo {
WBInfo( const WriteBackListener::ConnectionIdent& c, OID o, bool fromLastOperation )
: ident( c ), id( o ), fromLastOperation( fromLastOperation ) {}
WriteBackListener::ConnectionIdent ident;
OID id;
bool fromLastOperation;
};
// for getLastError
void _addWriteBack( vector<WBInfo>& all , const BSONObj& o, bool fromLastOperation );
vector<BSONObj> _handleWriteBacks( const vector<WBInfo>& all , bool fromWriteBackListener );
int _id; // unique client id
HostAndPort _remote; // server:port of remote socket end
// we use _a and _b to store shards we've talked to on the current request and the previous
// we use 2 so we can flip for getLastError type operations
set<string> _a; // actual set for _cur or _prev
set<string> _b; // "
set<string> * _cur; // pointer to _a or _b depending on state
set<string> * _prev; // ""
set<string> _sinceLastGetError; // all shards accessed since last getLastError
int _lastAccess;
bool _autoSplitOk;
static boost::thread_specific_ptr<ClientInfo> _tlInfo;
};
}
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