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/**
* Copyright (C) 2013 MongoDB 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/base/owned_pointer_vector.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/bson/bsonobjiterator.h"
#include "mongo/s/ns_targeter.h"
#include "mongo/s/range_arithmetic.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
/**
* A MockRange represents a range with endpoint that a MockNSTargeter uses to direct writes to
* a particular endpoint.
*/
struct MockRange {
MockRange( const ShardEndpoint& endpoint,
const NamespaceString nss,
const BSONObj& minKey,
const BSONObj& maxKey ) :
endpoint( endpoint ), range( nss, minKey, maxKey, getKeyPattern( minKey ) ) {
}
MockRange( const ShardEndpoint& endpoint, const KeyRange& range ) :
endpoint( endpoint ), range( range ) {
}
static BSONObj getKeyPattern( const BSONObj& key ) {
BSONObjIterator it( key );
BSONObjBuilder objB;
while ( it.more() )
objB.append( it.next().fieldName(), 1 );
return objB.obj();
}
const ShardEndpoint endpoint;
const KeyRange range;
};
/**
* A MockNSTargeter directs writes to particular endpoints based on a list of MockRanges given
* to the mock targeter on initialization.
*
* No refreshing behavior is currently supported.
*/
class MockNSTargeter : public NSTargeter {
public:
void init( const std::vector<MockRange*> mockRanges ) {
ASSERT( !mockRanges.empty() );
_mockRanges.mutableVector().insert( _mockRanges.mutableVector().end(),
mockRanges.begin(),
mockRanges.end() );
_nss = NamespaceString( _mockRanges.vector().front()->range.ns );
}
const NamespaceString& getNS() const {
return _nss;
}
/**
* Returns a ShardEndpoint for the doc from the mock ranges
*/
Status targetDoc( const BSONObj& doc, ShardEndpoint** endpoint ) const {
const std::vector<MockRange*>& ranges = getRanges();
for ( std::vector<MockRange*>::const_iterator it = ranges.begin(); it != ranges.end();
++it ) {
const MockRange* range = *it;
if ( rangeContains( range->range.minKey, range->range.maxKey, doc ) ) {
*endpoint = new ShardEndpoint( range->endpoint );
return Status::OK();
}
}
return Status( ErrorCodes::UnknownError, "no mock range found for document" );
}
/**
* Returns the first ShardEndpoint for the query from the mock ranges. Only can handle
* queries of the form { field : { $gte : <value>, $lt : <value> } }.
*/
Status targetQuery( const BSONObj& query, std::vector<ShardEndpoint*>* endpoints ) const {
KeyRange queryRange = parseRange( query );
const std::vector<MockRange*>& ranges = getRanges();
for ( std::vector<MockRange*>::const_iterator it = ranges.begin(); it != ranges.end();
++it ) {
const MockRange* range = *it;
if ( rangeOverlaps( queryRange.minKey,
queryRange.maxKey,
range->range.minKey,
range->range.maxKey ) ) {
endpoints->push_back( new ShardEndpoint( range->endpoint ) );
}
}
if ( endpoints->empty() ) return Status( ErrorCodes::UnknownError,
"no mock ranges found for query" );
return Status::OK();
}
void noteCouldNotTarget() {
// No-op
}
void noteStaleResponse( const ShardEndpoint& endpoint, const BSONObj& staleInfo ) {
// No-op
}
Status refreshIfNeeded() {
// No-op
return Status::OK();
}
const std::vector<MockRange*>& getRanges() const {
return _mockRanges.vector();
}
private:
KeyRange parseRange( const BSONObj& query ) const {
ASSERT_EQUALS( query.nFields(), 1 );
ASSERT_EQUALS( query.firstElement().type(), Object );
string fieldName = query.firstElement().fieldName();
BSONObj queryRange = query.firstElement().Obj();
ASSERT( !queryRange[GTE.l_].eoo() );
ASSERT( !queryRange[LT.l_].eoo() );
BSONObjBuilder minKeyB;
minKeyB.appendAs( queryRange[GTE.l_], fieldName );
BSONObjBuilder maxKeyB;
maxKeyB.appendAs( queryRange[LT.l_], fieldName );
return KeyRange( "", minKeyB.obj(), maxKeyB.obj(), BSON( fieldName << 1 ) );
}
NamespaceString _nss;
// Manually-stored ranges
OwnedPointerVector<MockRange> _mockRanges;
};
inline void assertEndpointsEqual( const ShardEndpoint& endpointA,
const ShardEndpoint& endpointB ) {
ASSERT_EQUALS( endpointA.shardName, endpointB.shardName );
ASSERT_EQUALS( endpointA.shardVersion.toLong(), endpointB.shardVersion.toLong() );
ASSERT_EQUALS( endpointA.shardVersion.epoch(), endpointB.shardVersion.epoch() );
ASSERT_EQUALS( endpointA.shardHost.toString(), endpointB.shardHost.toString() );
}
} // namespace mongo
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