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// s/commands_public.cpp
/**
* 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 "../util/message.h"
#include "../db/dbmessage.h"
#include "../client/connpool.h"
#include "../db/commands.h"
#include "config.h"
#include "chunk.h"
#include "strategy.h"
namespace mongo {
namespace dbgrid_pub_cmds {
class PublicGridCommand : public Command {
public:
PublicGridCommand( const char * n ) : Command( n ){
}
virtual bool slaveOk(){
return true;
}
virtual bool adminOnly() {
return false;
}
protected:
string getDBName( string ns ){
return ns.substr( 0 , ns.size() - 5 );
}
bool passthrough( DBConfig * conf, const BSONObj& cmdObj , BSONObjBuilder& result ){
ScopedDbConnection conn( conf->getPrimary() );
BSONObj res;
bool ok = conn->runCommand( conf->getName() , cmdObj , res );
result.appendElements( res );
conn.done();
return ok;
}
};
class NotAllowedOnShardedCollectionCmd : public PublicGridCommand {
public:
NotAllowedOnShardedCollectionCmd( const char * n ) : PublicGridCommand( n ){}
virtual string getFullNS( const string& dbName , const BSONObj& cmdObj ) = 0;
virtual bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
string dbName = getDBName( ns );
string fullns = getFullNS( dbName , cmdObj );
DBConfig * conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ){
return passthrough( conf , cmdObj , result );
}
errmsg = "can't do command: " + name + " on sharded collection";
return false;
}
};
// ----
class CountCmd : public PublicGridCommand {
public:
CountCmd() : PublicGridCommand("count") { }
bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
string dbName = getDBName( ns );
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
BSONObj filter = cmdObj["query"].embeddedObject();
DBConfig * conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ){
ScopedDbConnection conn( conf->getPrimary() );
result.append( "n" , (double)conn->count( fullns , filter ) );
conn.done();
result.append( "ok" , 1 );
return true;
}
ChunkManager * cm = conf->getChunkManager( fullns );
massert( "how could chunk manager be null!" , cm );
vector<Chunk*> chunks;
cm->getChunksForQuery( chunks , filter );
unsigned long long total = 0;
for ( vector<Chunk*>::iterator i = chunks.begin() ; i != chunks.end() ; i++ ){
Chunk * c = *i;
total += c->countObjects( filter );
}
result.append( "n" , (double)total );
result.append( "ok" , 1 );
return true;
}
} countCmd;
class ConvertToCappedCmd : public NotAllowedOnShardedCollectionCmd {
public:
ConvertToCappedCmd() : NotAllowedOnShardedCollectionCmd("convertToCapped"){}
virtual string getFullNS( const string& dbName , const BSONObj& cmdObj ){
return dbName + "." + cmdObj.firstElement().valuestrsafe();
}
} convertToCappedCmd;
class GroupCmd : public NotAllowedOnShardedCollectionCmd {
public:
GroupCmd() : NotAllowedOnShardedCollectionCmd("group"){}
virtual string getFullNS( const string& dbName , const BSONObj& cmdObj ){
return dbName + "." + cmdObj.firstElement().embeddedObjectUserCheck()["ns"].valuestrsafe();
}
} groupCmd;
class DistinctCmd : public PublicGridCommand {
public:
DistinctCmd() : PublicGridCommand("distinct"){}
virtual void help( stringstream &help ) const {
help << "{ distinct : 'collection name' , key : 'a.b' }";
}
bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
string dbName = getDBName( ns );
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
DBConfig * conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ){
return passthrough( conf , cmdObj , result );
}
ChunkManager * cm = conf->getChunkManager( fullns );
massert( "how could chunk manager be null!" , cm );
vector<Chunk*> chunks;
cm->getChunksForQuery( chunks , BSONObj() );
set<BSONObj,BSONObjCmp> all;
int size = 32;
for ( vector<Chunk*>::iterator i = chunks.begin() ; i != chunks.end() ; i++ ){
Chunk * c = *i;
ScopedDbConnection conn( c->getShard() );
BSONObj res;
bool ok = conn->runCommand( conf->getName() , cmdObj , res );
conn.done();
if ( ! ok ){
result.appendElements( res );
return false;
}
BSONObjIterator it( res["values"].embeddedObjectUserCheck() );
while ( it.more() ){
BSONElement nxt = it.next();
BSONObjBuilder temp(32);
temp.appendAs( nxt , "x" );
all.insert( temp.obj() );
}
}
BSONObjBuilder b( size );
int n=0;
for ( set<BSONObj,BSONObjCmp>::iterator i = all.begin() ; i != all.end(); i++ ){
b.appendAs( i->firstElement() , b.numStr( n++ ).c_str() );
}
result.appendArray( "values" , b.obj() );
result.append( "ok" , 1 );
return true;
}
} disinctCmd;
class MRCmd : public PublicGridCommand {
public:
MRCmd() : PublicGridCommand( "mapreduce" ){}
bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
string dbName = getDBName( ns );
string collection = cmdObj.firstElement().valuestrsafe();
string fullns = dbName + "." + collection;
DBConfig * conf = grid.getDBConfig( dbName , false );
if ( ! conf || ! conf->isShardingEnabled() || ! conf->isSharded( fullns ) ){
return passthrough( conf , cmdObj , result );
}
ChunkManager * cm = conf->getChunkManager( fullns );
BSONObj q;
if ( cmdObj["query"].type() == Object ){
q = cmdObj["query"].embeddedObjectUserCheck();
}
vector<Chunk*> chunks;
cm->getChunksForQuery( chunks , q );
BSONObjBuilder finalB;
finalB.append( "mapreduce.shardedfinish" , cmdObj );
BSONObjBuilder shardresults;
for ( vector<Chunk*>::iterator i = chunks.begin() ; i != chunks.end() ; i++ ){
Chunk * c = *i;
ScopedDbConnection conn( c->getShard() );
BSONObj myres;
if ( ! conn->runCommand( dbName , cmdObj , myres ) ){
errmsg = "mongod mr failed: ";
errmsg += myres.toString();
return 0;
}
shardresults.append( c->getShard() , myres );
}
finalB.append( "shards" , shardresults.obj() );
BSONObj final = finalB.obj();
ScopedDbConnection conn( conf->getPrimary() );
BSONObj finalResult;
if ( ! conn->runCommand( dbName , final , finalResult ) ){
errmsg = "final reduce failed: ";
errmsg += finalResult.toString();
return 0;
}
result.appendElements( finalResult );
return 1;
}
} mrCmd;
}
}
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