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//@file chunktests.cpp : s/chunk.{h,cpp} tests

/**
 *    Copyright (C) 2012 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.
 */

#include "mongo/platform/basic.h"

#include "mongo/db/json.h"
#include "mongo/dbtests/dbtests.h"
#include "mongo/s/chunk_manager.h"

namespace mongo {

    using std::set;
    using std::string;
    using std::vector;

    class TestableChunkManager : public ChunkManager {
    public:

        TestableChunkManager(const string& ns, const ShardKeyPattern& keyPattern, bool unique)
            : ChunkManager(ns, keyPattern, unique) {
        }

        void setSingleChunkForShards( const vector<BSONObj> &splitPoints ) {
            vector<BSONObj> mySplitPoints( splitPoints );
            mySplitPoints.insert( mySplitPoints.begin(), _keyPattern.getKeyPattern().globalMin() );
            mySplitPoints.push_back( _keyPattern.getKeyPattern().globalMax() );
            
            for (unsigned i = 1; i < mySplitPoints.size(); ++i) {
                const string shardId = str::stream() << (i - 1);
                _shardIds.insert(shardId);

                Shard shard(shardId, ConnectionString(HostAndPort(shardId)));
                Shard::installShard(shardId, shard);

                std::shared_ptr<Chunk> chunk(new Chunk(this,
                                                         mySplitPoints[i - 1],
                                                         mySplitPoints[i],
                                                         shardId));
                _chunkMap[mySplitPoints[i]] = chunk;
            }
            
            _chunkRanges.reloadAll(_chunkMap);
        }
    };
    
} // namespace mongo

namespace ChunkTests {

    namespace ChunkManagerTests {
        
        typedef mongo::TestableChunkManager ChunkManager;

        class Base {
        public:
            virtual ~Base() {}
            void run() {
                ShardKeyPattern shardKeyPattern(shardKey());
                ChunkManager chunkManager("", shardKeyPattern, false);
                chunkManager.setSingleChunkForShards( splitPointsVector() );
                
                set<ShardId> shardIds;
                chunkManager.getShardIdsForQuery(shardIds, query());
                
                BSONArrayBuilder b;
                for (const ShardId& shardId : shardIds) {
                    b << shardId;
                }
                ASSERT_EQUALS( expectedShardNames(), b.arr() );
            }
        protected:
            virtual BSONObj shardKey() const { return BSON( "a" << 1 ); }
            virtual BSONArray splitPoints() const { return BSONArray(); }
            virtual BSONObj query() const { return BSONObj(); }
            virtual BSONArray expectedShardNames() const { return BSON_ARRAY( "0" ); }
            virtual vector<BSONObj> splitPointsVector() const {
                vector<BSONObj> ret;
                BSONArray a = splitPoints();
                BSONObjIterator i( a );
                while( i.more() ) {
                    ret.push_back( i.next().Obj().getOwned() );
                }
                return ret;
            }
        };
        
        class EmptyQuerySingleShard : public Base {
        };
        
        class MultiShardBase : public Base {
            virtual BSONArray splitPoints() const {
                return BSON_ARRAY( BSON( "a" << "x" ) << BSON( "a" << "y" ) << BSON( "a" << "z" ) );
            }            
        };
        
        class EmptyQueryMultiShard : public MultiShardBase {
            virtual BSONArray expectedShardNames() const {
                return BSON_ARRAY( "0" << "1" << "2" << "3" );
            }
        };

        class UniversalRangeMultiShard : public EmptyQueryMultiShard {
            virtual BSONObj query() const { return BSON( "b" << 1 ); }
        };
        
        class EqualityRangeSingleShard : public EmptyQuerySingleShard {
            virtual BSONObj query() const { return BSON( "a" << "x" ); }
        };

        class EqualityRangeMultiShard : public MultiShardBase {
            virtual BSONObj query() const { return BSON( "a" << "y" ); }
            virtual BSONArray expectedShardNames() const { return BSON_ARRAY( "2" ); }
        };
        
        class SetRangeMultiShard : public MultiShardBase {
            virtual BSONObj query() const { return fromjson( "{a:{$in:['u','y']}}" ); }
            virtual BSONArray expectedShardNames() const { return BSON_ARRAY( "0" << "2" ); }
        };
        
        class GTRangeMultiShard : public MultiShardBase {
            virtual BSONObj query() const { return BSON( "a" << GT << "x" ); }
            virtual BSONArray expectedShardNames() const { return BSON_ARRAY( "1" << "2" << "3" ); }
        };

        class GTERangeMultiShard : public MultiShardBase {
            virtual BSONObj query() const { return BSON( "a" << GTE << "x" ); }
            virtual BSONArray expectedShardNames() const { return BSON_ARRAY( "1" << "2" << "3" ); }
        };

        class LTRangeMultiShard : public MultiShardBase {
            virtual BSONObj query() const { return BSON( "a" << LT << "y" ); }
            /**
             * It isn't actually necessary to return shard 2 because its lowest key is "y", which
             * is excluded from the query.  SERVER-4791
             */
            virtual BSONArray expectedShardNames() const { return BSON_ARRAY( "0" << "1" << "2" ); }
        };

        class LTERangeMultiShard : public MultiShardBase {
            virtual BSONObj query() const { return BSON( "a" << LTE << "y" ); }
            virtual BSONArray expectedShardNames() const { return BSON_ARRAY( "0" << "1" << "2" ); }
        };

        class OrEqualities : public MultiShardBase {
            virtual BSONObj query() const { return fromjson( "{$or:[{a:'u'},{a:'y'}]}" ); }
            virtual BSONArray expectedShardNames() const { return BSON_ARRAY( "0" << "2" ); }
        };
        
        class OrEqualityInequality : public MultiShardBase {
            virtual BSONObj query() const { return fromjson( "{$or:[{a:'u'},{a:{$gte:'y'}}]}" ); }
            virtual BSONArray expectedShardNames() const { return BSON_ARRAY( "0" << "2" << "3" ); }
        };

        class OrEqualityInequalityUnhelpful : public MultiShardBase {
            virtual BSONObj query() const {
                return fromjson( "{$or:[{a:'u'},{a:{$gte:'zz'}},{}]}" );
            }
            virtual BSONArray expectedShardNames() const {
                return BSON_ARRAY( "0" << "1" << "2" << "3" );
            }
        };

        template<class BASE>
        class Unsatisfiable : public BASE {
            /**
             * SERVER-4914 For now the first shard is returned for unsatisfiable queries, as some
             * clients of getShardIdsForQuery() expect at least one shard.
             */
            virtual BSONArray expectedShardNames() const {
                return BSON_ARRAY( "0" ) /* BSONArray() */;
            }
        };
        
        class UnsatisfiableRangeSingleShard : public Unsatisfiable<Base> {
            virtual BSONObj query() const { return BSON( "a" << GT << "x" << LT << "x" ); }
        };
        
        class UnsatisfiableRangeMultiShard : public Unsatisfiable<MultiShardBase> {
            virtual BSONObj query() const { return BSON( "a" << GT << "x" << LT << "x" ); }            
        };

        class EqualityThenUnsatisfiable : public Unsatisfiable<Base> {
            virtual BSONObj shardKey() const { return BSON( "a" << 1 << "b" << 1 ); }
            virtual BSONObj query() const { return BSON( "a" << 1 << "b" << GT << 4 << LT << 4 ); }
        };

        class InequalityThenUnsatisfiable : public Unsatisfiable<Base> {
            virtual BSONObj shardKey() const { return BSON( "a" << 1 << "b" << 1 ); }
            virtual BSONObj query() const {
                return BSON( "a" << GT << 1 << "b" << GT << 4 << LT << 4 );
            }
        };
        
        class OrEqualityUnsatisfiableInequality : public MultiShardBase {
            virtual BSONObj query() const {
                return fromjson( "{$or:[{a:'x'},{a:{$gt:'u',$lt:'u'}},{a:{$gte:'y'}}]}" );
            }
            virtual BSONArray expectedShardNames() const { return BSON_ARRAY( "1" << "2" << "3" ); }
        };

        class CompoundKeyBase : public Base {
            virtual BSONObj shardKey() const {
                return BSON( "a" << 1 << "b" << 1 );
            }
            virtual BSONArray splitPoints() const {
                return BSON_ARRAY( BSON( "a" << 5 << "b" << 10 ) << BSON ( "a" << 5 << "b" << 20 ) );
            }
        };

        class InMultiShard : public CompoundKeyBase {
            virtual BSONObj query() const {
                return BSON( "a" << BSON( "$in" << BSON_ARRAY( 0 << 5 << 10 ) ) <<
                             "b" << BSON( "$in" << BSON_ARRAY( 0 << 5 << 25 ) ) );
            }
            // If we were to send this query to just the shards it actually needed to hit, it would only hit shards 0 and 2
            // Because of the optimization from SERVER-4745, however, we'll also hit shard 1.
            virtual BSONArray expectedShardNames() const {
                return BSON_ARRAY( "0" << "1" << "2" );
            }
        };

    } // namespace ChunkManagerTests
    
    class All : public Suite {
    public:
        All() : Suite( "chunk" ) {
        }
        
        void setupTests() {
            add<ChunkManagerTests::EmptyQuerySingleShard>();
            add<ChunkManagerTests::EmptyQueryMultiShard>();
            add<ChunkManagerTests::UniversalRangeMultiShard>();
            add<ChunkManagerTests::EqualityRangeSingleShard>();
            add<ChunkManagerTests::EqualityRangeMultiShard>();
            add<ChunkManagerTests::SetRangeMultiShard>();
            add<ChunkManagerTests::GTRangeMultiShard>();
            add<ChunkManagerTests::GTERangeMultiShard>();
            add<ChunkManagerTests::LTRangeMultiShard>();
            add<ChunkManagerTests::LTERangeMultiShard>();
            add<ChunkManagerTests::OrEqualities>();
            add<ChunkManagerTests::OrEqualityInequality>();
            add<ChunkManagerTests::OrEqualityInequalityUnhelpful>();
            add<ChunkManagerTests::UnsatisfiableRangeSingleShard>();
            add<ChunkManagerTests::UnsatisfiableRangeMultiShard>();
            add<ChunkManagerTests::EqualityThenUnsatisfiable>();
            add<ChunkManagerTests::InequalityThenUnsatisfiable>();
            add<ChunkManagerTests::OrEqualityUnsatisfiableInequality>();
            add<ChunkManagerTests::InMultiShard>();
        }
    };

    SuiteInstance<All> myAll;

} // namespace ChunkTests