forked from mongodb/mongo
/
strategy_single.cpp
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strategy_single.cpp
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/*
* 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/>.
*/
// strategy_simple.cpp
#include "pch.h"
#include "request.h"
#include "cursors.h"
#include "../client/connpool.h"
#include "../db/commands.h"
namespace mongo {
class SingleStrategy : public Strategy {
public:
SingleStrategy() {
_commandsSafeToPass.insert( "$eval" );
_commandsSafeToPass.insert( "create" );
}
private:
virtual void queryOp( Request& r ) {
QueryMessage q( r.d() );
LOG(3) << "single query: " << q.ns << " " << q.query << " ntoreturn: " << q.ntoreturn << " options : " << q.queryOptions << endl;
if ( r.isCommand() ) {
if ( handleSpecialNamespaces( r , q ) )
return;
int loops = 5;
while ( true ) {
BSONObjBuilder builder;
try {
BSONObj cmdObj = q.query;
{
BSONElement e = cmdObj.firstElement();
if ( e.type() == Object && (e.fieldName()[0] == '$'
? str::equals("query", e.fieldName()+1)
: str::equals("query", e.fieldName())))
cmdObj = e.embeddedObject();
}
bool ok = Command::runAgainstRegistered(q.ns, cmdObj, builder, q.queryOptions);
if ( ok ) {
BSONObj x = builder.done();
replyToQuery(0, r.p(), r.m(), x);
return;
}
break;
}
catch ( StaleConfigException& e ) {
if ( loops <= 0 )
throw e;
loops--;
log() << "retrying command: " << q.query << endl;
ShardConnection::checkMyConnectionVersions( e.getns() );
}
catch ( AssertionException& e ) {
e.getInfo().append( builder , "assertion" , "assertionCode" );
builder.append( "errmsg" , "db assertion failure" );
builder.append( "ok" , 0 );
BSONObj x = builder.done();
replyToQuery(0, r.p(), r.m(), x);
return;
}
}
string commandName = q.query.firstElementFieldName();
uassert(13390, "unrecognized command: " + commandName, _commandsSafeToPass.count(commandName) != 0);
}
doQuery( r , r.primaryShard() );
}
virtual void getMore( Request& r ) {
const char *ns = r.getns();
LOG(3) << "single getmore: " << ns << endl;
long long id = r.d().getInt64( 4 );
// we used ScopedDbConnection because we don't get about config versions
// not deleting data is handled elsewhere
// and we don't want to call setShardVersion
ScopedDbConnection conn( cursorCache.getRef( id ) );
Message response;
bool ok = conn->callRead( r.m() , response);
uassert( 10204 , "dbgrid: getmore: error calling db", ok);
r.reply( response , "" /*conn->getServerAddress() */ );
conn.done();
}
void handleIndexWrite( int op , Request& r ) {
DbMessage& d = r.d();
if ( op == dbInsert ) {
while( d.moreJSObjs() ) {
BSONObj o = d.nextJsObj();
const char * ns = o["ns"].valuestr();
if ( r.getConfig()->isSharded( ns ) ) {
BSONObj newIndexKey = o["key"].embeddedObjectUserCheck();
uassert( 10205 , (string)"can't use unique indexes with sharding ns:" + ns +
" key: " + o["key"].embeddedObjectUserCheck().toString() ,
IndexDetails::isIdIndexPattern( newIndexKey ) ||
! o["unique"].trueValue() ||
r.getConfig()->getChunkManager( ns )->getShardKey().isPrefixOf( newIndexKey ) );
ChunkManagerPtr cm = r.getConfig()->getChunkManager( ns );
assert( cm );
set<Shard> shards;
cm->getAllShards(shards);
for (set<Shard>::const_iterator it=shards.begin(), end=shards.end(); it != end; ++it)
doWrite( op , r , *it );
}
else {
doWrite( op , r , r.primaryShard() );
}
r.gotInsert();
}
}
else if ( op == dbUpdate ) {
throw UserException( 8050 , "can't update system.indexes" );
}
else if ( op == dbDelete ) {
// TODO
throw UserException( 8051 , "can't delete indexes on sharded collection yet" );
}
else {
log() << "handleIndexWrite invalid write op: " << op << endl;
throw UserException( 8052 , "handleIndexWrite invalid write op" );
}
}
virtual void writeOp( int op , Request& r ) {
const char *ns = r.getns();
if ( r.isShardingEnabled() &&
strstr( ns , ".system.indexes" ) == strchr( ns , '.' ) &&
strchr( ns , '.' ) ) {
LOG(1) << " .system.indexes write for: " << ns << endl;
handleIndexWrite( op , r );
return;
}
LOG(3) << "single write: " << ns << endl;
doWrite( op , r , r.primaryShard() );
r.gotInsert(); // Won't handle mulit-insert correctly. Not worth parsing the request.
}
bool handleSpecialNamespaces( Request& r , QueryMessage& q ) {
const char * ns = r.getns();
ns = strstr( r.getns() , ".$cmd.sys." );
if ( ! ns )
return false;
ns += 10;
BSONObjBuilder b;
vector<Shard> shards;
if ( strcmp( ns , "inprog" ) == 0 ) {
Shard::getAllShards( shards );
BSONArrayBuilder arr( b.subarrayStart( "inprog" ) );
for ( unsigned i=0; i<shards.size(); i++ ) {
Shard shard = shards[i];
ScopedDbConnection conn( shard );
BSONObj temp = conn->findOne( r.getns() , BSONObj() );
if ( temp["inprog"].isABSONObj() ) {
BSONObjIterator i( temp["inprog"].Obj() );
while ( i.more() ) {
BSONObjBuilder x;
BSONObjIterator j( i.next().Obj() );
while( j.more() ) {
BSONElement e = j.next();
if ( str::equals( e.fieldName() , "opid" ) ) {
stringstream ss;
ss << shard.getName() << ':' << e.numberInt();
x.append( "opid" , ss.str() );
}
else if ( str::equals( e.fieldName() , "client" ) ) {
x.appendAs( e , "client_s" );
}
else {
x.append( e );
}
}
arr.append( x.obj() );
}
}
conn.done();
}
arr.done();
}
else if ( strcmp( ns , "killop" ) == 0 ) {
BSONElement e = q.query["op"];
if ( strstr( r.getns() , "admin." ) != 0 ) {
b.append( "err" , "unauthorized" );
}
else if ( e.type() != String ) {
b.append( "err" , "bad op" );
b.append( e );
}
else {
b.append( e );
string s = e.String();
string::size_type i = s.find( ':' );
if ( i == string::npos ) {
b.append( "err" , "bad opid" );
}
else {
string shard = s.substr( 0 , i );
int opid = atoi( s.substr( i + 1 ).c_str() );
b.append( "shard" , shard );
b.append( "shardid" , opid );
log() << "want to kill op: " << e << endl;
Shard s(shard);
ScopedDbConnection conn( s );
conn->findOne( r.getns() , BSON( "op" << opid ) );
conn.done();
}
}
}
else if ( strcmp( ns , "unlock" ) == 0 ) {
b.append( "err" , "can't do unlock through mongos" );
}
else {
log( LL_WARNING ) << "unknown sys command [" << ns << "]" << endl;
return false;
}
BSONObj x = b.done();
replyToQuery(0, r.p(), r.m(), x);
return true;
}
void insertSharded( DBConfigPtr conf, const char* ns, BSONObj& o, int flags, bool safe, const char* nsChunkLookup ) {
// only useful for shards
}
void updateSharded( DBConfigPtr conf, const char* ns, BSONObj& query, BSONObj& toupdate, int flags, bool safe ) {
// only useful for shards
}
set<string> _commandsSafeToPass;
};
Strategy * SINGLE = new SingleStrategy();
}