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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.
*/
/**
* This file contains tests for mongo/db/exec/projection_exec.cpp
*/
#include "mongo/db/exec/projection_exec.h"
#include <memory>
#include "mongo/db/json.h"
#include "mongo/db/exec/working_set_computed_data.h"
#include "mongo/db/matcher/expression_parser.h"
#include "mongo/unittest/unittest.h"
using namespace mongo;
namespace {
using std::unique_ptr;
/**
* Utility function to create MatchExpression
*/
MatchExpression* parseMatchExpression(const BSONObj& obj) {
StatusWithMatchExpression status = MatchExpressionParser::parse(obj);
ASSERT_TRUE(status.isOK());
MatchExpression* expr(status.getValue());
return expr;
}
//
// transform tests
//
/**
* test function to verify results of transform()
* on a working set member.
*
* specStr - projection specification
* queryStr - query
* objStr - object to run projection on
* data - computed data. Owned by working set member created in this function if not null.
* expectedStatusOK - expected status of transformation
* expectedObjStr - expected object after successful projection.
* Ignored if expectedStatusOK is false.
*/
void testTransform(const char* specStr, const char* queryStr, const char* objStr,
WorkingSetComputedData* data,
bool expectedStatusOK, const char* expectedObjStr) {
// Create projection exec object.
BSONObj spec = fromjson(specStr);
BSONObj query = fromjson(queryStr);
unique_ptr<MatchExpression> queryExpression(parseMatchExpression(query));
ProjectionExec exec(spec, queryExpression.get());
// Create working set member.
WorkingSetMember wsm;
wsm.state = WorkingSetMember::OWNED_OBJ;
wsm.obj = Snapshotted<BSONObj>(SnapshotId(), fromjson(objStr));
if (data) {
wsm.addComputed(data);
}
// Transform object
Status status = exec.transform(&wsm);
// There are fewer checks to perform if we are expected a failed status.
if (!expectedStatusOK) {
if (status.isOK()) {
mongoutils::str::stream ss;
ss << "expected transform() to fail but got success instead."
<< "\nprojection spec: " << specStr
<< "\nquery: " << queryStr
<< "\nobject before projection: " << objStr;
FAIL(ss);
}
return;
}
// If we are expecting a successful transformation but got a failed status instead,
// print out status message in assertion message.
if (!status.isOK()) {
mongoutils::str::stream ss;
ss << "transform() test failed: unexpected failed status: " << status.toString()
<< "\nprojection spec: " << specStr
<< "\nquery: " << queryStr
<< "\nobject before projection: " << objStr
<< "\nexpected object after projection: " << expectedObjStr;
FAIL(ss);
}
// Finally, we compare the projected object.
const BSONObj& obj = wsm.obj.value();
BSONObj expectedObj = fromjson(expectedObjStr);
if (obj != expectedObj) {
mongoutils::str::stream ss;
ss << "transform() test failed: unexpected projected object."
<< "\nprojection spec: " << specStr
<< "\nquery: " << queryStr
<< "\nobject before projection: " << objStr
<< "\nexpected object after projection: " << expectedObjStr
<< "\nactual object after projection: " << obj.toString();
FAIL(ss);
}
}
/**
* testTransform without computed data argument.
*/
void testTransform(const char* specStr, const char* queryStr, const char* objStr,
bool expectedStatusOK, const char* expectedObjStr) {
testTransform(specStr, queryStr, objStr, NULL, expectedStatusOK, expectedObjStr);
}
//
// position $
//
TEST(ProjectionExecTest, TransformPositionalDollar) {
// Valid position $ projections.
testTransform("{'a.$': 1}", "{a: 10}", "{a: [10, 20, 30]}", true, "{a: [10]}");
testTransform("{'a.$': 1}", "{a: 20}", "{a: [10, 20, 30]}", true, "{a: [20]}");
testTransform("{'a.$': 1}", "{a: 30}", "{a: [10, 20, 30]}", true, "{a: [30]}");
testTransform("{'a.$': 1}", "{a: {$gt: 4}}", "{a: [5]}", true, "{a: [5]}");
// Invalid position $ projections.
testTransform("{'a.$': 1}", "{a: {$size: 1}}", "{a: [5]}", false, "");
}
//
// $elemMatch
//
TEST(ProjectionExecTest, TransformElemMatch) {
const char* s = "{a: [{x: 1, y: 10}, {x: 1, y: 20}, {x: 2, y: 10}]}";
// Valid $elemMatch projections.
testTransform("{a: {$elemMatch: {x: 1}}}", "{}", s, true, "{a: [{x: 1, y: 10}]}");
testTransform("{a: {$elemMatch: {x: 1, y: 20}}}", "{}", s, true, "{a: [{x: 1, y: 20}]}");
testTransform("{a: {$elemMatch: {x: 2}}}", "{}", s, true, "{a: [{x: 2, y: 10}]}");
testTransform("{a: {$elemMatch: {x: 3}}}", "{}", s, true, "{}");
// $elemMatch on unknown field z
testTransform("{a: {$elemMatch: {z: 1}}}", "{}", s, true, "{}");
}
//
// $slice
//
TEST(ProjectionExecTest, TransformSliceCount) {
// Valid $slice projections using format {$slice: count}.
testTransform("{a: {$slice: -10}}", "{}", "{a: [4, 6, 8]}", true, "{a: [4, 6, 8]}");
testTransform("{a: {$slice: -3}}", "{}", "{a: [4, 6, 8]}", true, "{a: [4, 6, 8]}");
testTransform("{a: {$slice: -1}}", "{}", "{a: [4, 6, 8]}", true, "{a: [8]}");
testTransform("{a: {$slice: 0}}", "{}", "{a: [4, 6, 8]}", true, "{a: []}");
testTransform("{a: {$slice: 1}}", "{}", "{a: [4, 6, 8]}", true, "{a: [4]}");
testTransform("{a: {$slice: 3}}", "{}", "{a: [4, 6, 8]}", true, "{a: [4, 6, 8]}");
testTransform("{a: {$slice: 10}}", "{}", "{a: [4, 6, 8]}", true, "{a: [4, 6, 8]}");
}
TEST(ProjectionExecTest, TransformSliceSkipLimit) {
// Valid $slice projections using format {$slice: [skip, limit]}.
// Non-positive limits are rejected at the query parser and therefore not handled by
// the projection execution stage. In fact, it will abort on an invalid limit.
testTransform("{a: {$slice: [-10, 10]}}", "{}", "{a: [4, 6, 8]}", true, "{a: [4, 6, 8]}");
testTransform("{a: {$slice: [-3, 5]}}", "{}", "{a: [4, 6, 8]}", true, "{a: [4, 6, 8]}");
testTransform("{a: {$slice: [-1, 1]}}", "{}", "{a: [4, 6, 8]}", true, "{a: [8]}");
testTransform("{a: {$slice: [0, 2]}}", "{}", "{a: [4, 6, 8]}", true, "{a: [4, 6]}");
testTransform("{a: {$slice: [0, 1]}}", "{}", "{a: [4, 6, 8]}", true, "{a: [4]}");
testTransform("{a: {$slice: [1, 1]}}", "{}", "{a: [4, 6, 8]}", true, "{a: [6]}");
testTransform("{a: {$slice: [3, 5]}}", "{}", "{a: [4, 6, 8]}", true, "{a: []}");
testTransform("{a: {$slice: [10, 10]}}", "{}", "{a: [4, 6, 8]}", true, "{a: []}");
}
//
// $meta
// $meta projections add computed values to the projected object.
//
TEST(ProjectionExecTest, TransformMetaTextScore) {
// Query {} is ignored.
testTransform("{b: {$meta: 'textScore'}}", "{}", "{a: 'hello'}",
new mongo::TextScoreComputedData(100),
true, "{a: 'hello', b: 100}");
// Projected meta field should overwrite existing field.
testTransform("{b: {$meta: 'textScore'}}", "{}", "{a: 'hello', b: -1}",
new mongo::TextScoreComputedData(100),
true, "{a: 'hello', b: 100}");
}
} // namespace
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