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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 "../client/parallel.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 DropCmd : public PublicGridCommand {
public:
DropCmd() : PublicGridCommand( "drop" ){}
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 );
log() << "DROP: " << fullns << endl;
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 );
cm->drop();
return 1;
}
} dropCmd;
class DropDBCmd : public PublicGridCommand {
public:
DropDBCmd() : PublicGridCommand( "dropDatabase" ){}
bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
BSONElement e = cmdObj.firstElement();
if ( ! e.isNumber() || e.number() != 1 ){
errmsg = "invalid params";
return 0;
}
string dbName = getDBName( ns );
DBConfig * conf = grid.getDBConfig( dbName , false );
log() << "DROP DATABASE: " << dbName << endl;
if ( ! conf || ! conf->isShardingEnabled() ){
log(1) << " passing though drop database for: " << dbName << endl;
return passthrough( conf , cmdObj , result );
}
if ( ! conf->dropDatabase( errmsg ) )
return false;
result.append( "dropped" , dbName );
return true;
}
} dropDBCmd;
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();
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 );
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() );
return true;
}
} disinctCmd;
class MRCmd : public PublicGridCommand {
public:
MRCmd() : PublicGridCommand( "mapreduce" ){}
string getTmpName( const string& coll ){
static int inc = 1;
stringstream ss;
ss << "tmp.mrs." << coll << "_" << time(0) << "_" << inc++;
return ss.str();
}
BSONObj fixForShards( const BSONObj& orig , const string& output ){
BSONObjBuilder b;
BSONObjIterator i( orig );
while ( i.more() ){
BSONElement e = i.next();
string fn = e.fieldName();
if ( fn == "map" ||
fn == "mapreduce" ||
fn == "reduce" ||
fn == "query" ||
fn == "sort" ||
fn == "verbose" ){
b.append( e );
}
else if ( fn == "keeptemp" ||
fn == "out" ||
fn == "finalize" ){
// we don't want to copy these
}
else {
uassert( (string)"don't know mr field: " + fn , 0 );
}
}
b.append( "out" , output );
return b.obj();
}
bool run(const char *ns, BSONObj& cmdObj, string& errmsg, BSONObjBuilder& result, bool){
Timer t;
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 );
}
BSONObjBuilder timingBuilder;
ChunkManager * cm = conf->getChunkManager( fullns );
BSONObj q;
if ( cmdObj["query"].type() == Object ){
q = cmdObj["query"].embeddedObjectUserCheck();
}
vector<Chunk*> chunks;
cm->getChunksForQuery( chunks , q );
const string shardedOutputCollection = getTmpName( collection );
BSONObj shardedCommand = fixForShards( cmdObj , shardedOutputCollection );
BSONObjBuilder finalCmd;
finalCmd.append( "mapreduce.shardedfinish" , cmdObj );
finalCmd.append( "shardedOutputCollection" , shardedOutputCollection );
list< shared_ptr<Future::CommandResult> > futures;
for ( vector<Chunk*>::iterator i = chunks.begin() ; i != chunks.end() ; i++ ){
Chunk * c = *i;
futures.push_back( Future::spawnCommand( c->getShard() , dbName , shardedCommand ) );
}
BSONObjBuilder shardresults;
for ( list< shared_ptr<Future::CommandResult> >::iterator i=futures.begin(); i!=futures.end(); i++ ){
shared_ptr<Future::CommandResult> res = *i;
if ( ! res->join() ){
errmsg = "mongod mr failed: ";
errmsg += res->result().toString();
return 0;
}
shardresults.append( res->getServer() , res->result() );
}
finalCmd.append( "shards" , shardresults.obj() );
timingBuilder.append( "shards" , t.millis() );
Timer t2;
ScopedDbConnection conn( conf->getPrimary() );
BSONObj finalResult;
if ( ! conn->runCommand( dbName , finalCmd.obj() , finalResult ) ){
errmsg = "final reduce failed: ";
errmsg += finalResult.toString();
return 0;
}
timingBuilder.append( "final" , t2.millis() );
result.appendElements( finalResult );
result.append( "timeMillis" , t.millis() );
result.append( "timing" , timingBuilder.obj() );
return 1;
}
} mrCmd;
}
}
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