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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 in the license file.
*/
#pragma once
#include "mongo/pch.h"
#include <map>
#include <set>
#include <vector>
#include "mongo/db/client_basic.h"
#include "mongo/s/chunk.h"
#include "mongo/s/writeback_listener.h"
#include "mongo/s/write_ops/batch_write_exec.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 addShardHost( const std::string& shardHost );
/**
* Notes that this client wrote to these particular hosts with write commands.
*/
void addHostOpTime(ConnectionString connstr, HostOpTime stat);
void addHostOpTimes( const HostOpTimeMap& hostOpTimes );
/**
* gets shards used on the previous request
*/
std::set<std::string>* getPrevShardHosts() const { return &_prev->shardHostsWritten; }
/**
* Gets the shards, hosts, and opTimes the client last wrote to with write commands.
*/
const HostOpTimeMap& getPrevHostOpTimes() const {
return _prev->hostOpTimes;
}
/**
* gets all shards we've accessed since the last time we called clearSinceLastGetError
*/
const std::set<std::string>& sinceLastGetError() const { return _sinceLastGetError; }
/**
* clears list of shards we've talked to
*/
void clearSinceLastGetError() { _sinceLastGetError.clear(); }
/**
* resets the information stored for the current request
*/
void clearRequestInfo(){ _cur->clear(); }
void disableForCommand();
/** @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:
int _id; // unique client id
HostAndPort _remote; // server:port of remote socket end
struct RequestInfo {
void clear() {
shardHostsWritten.clear();
hostOpTimes.clear();
}
std::set<std::string> shardHostsWritten;
HostOpTimeMap hostOpTimes;
};
// we use _a and _b to store info from the current request and the previous request
// we use 2 so we can flip for getLastError type operations
RequestInfo _a; // actual set for _cur or _prev
RequestInfo _b; // "
RequestInfo* _cur; // pointer to _a or _b depending on state
RequestInfo* _prev; // ""
std::set<std::string> _sinceLastGetError; // all shards accessed since last getLastError
int _lastAccess;
bool _autoSplitOk;
static boost::thread_specific_ptr<ClientInfo> _tlInfo;
};
/* Look for $gleStats in a command response, and fill in ClientInfo with the data,
* if found.
* This data will be used by subsequent GLE calls, to ensure we look for the correct
* write on the correct PRIMARY.
* result: the result from calling runCommand
* conn: the std::string name of the hostAndPort where the command ran. This can be a replica set
* seed list.
*/
void saveGLEStats(const BSONObj& result, const std::string& conn);
}
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