SERVER-29131 Support resumeAfter option to control where to start returning notifications from, which always errors if no entry with the given resumeToken exists

1 files changed, 191 insertions, 0 deletions

diff --git a/src/mongo/db/pipeline/document_source_check_resume_token_test.cpp b/src/mongo/db/pipeline/document_source_check_resume_token_test.cpp
new file mode 100644
index 00000000000..a9f057ee353
--- /dev/null
+++ b/src/mongo/db/pipeline/document_source_check_resume_token_test.cpp
@@ -0,0 +1,191 @@
+/**
+ * Copyright (C) 2017 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.
+ */
+
+#include "mongo/platform/basic.h"
+
+#include <boost/intrusive_ptr.hpp>
+#include <memory>
+
+#include "mongo/bson/bsonelement.h"
+#include "mongo/bson/bsonobj.h"
+#include "mongo/bson/bsonobjbuilder.h"
+#include "mongo/db/pipeline/aggregation_context_fixture.h"
+#include "mongo/db/pipeline/document_source_check_resume_token.h"
+#include "mongo/db/pipeline/document_source_mock.h"
+#include "mongo/db/pipeline/document_value_test_util.h"
+#include "mongo/db/pipeline/expression_context.h"
+#include "mongo/db/pipeline/resume_token.h"
+#include "mongo/db/service_context.h"
+#include "mongo/stdx/memory.h"
+#include "mongo/unittest/death_test.h"
+#include "mongo/unittest/unittest.h"
+
+using boost::intrusive_ptr;
+
+namespace mongo {
+namespace {
+static constexpr StringData kTestNs = "test.ns"_sd;
+
+class CheckResumeTokenTest : public AggregationContextFixture {
+public:
+    CheckResumeTokenTest() : _mock(DocumentSourceMock::create()) {}
+
+protected:
+    /**
+     * Puts an arbitrary document with resume token corresponding to the given timestamp, id, and
+     * namespace in the mock queue.
+     */
+    void addDocument(Timestamp ts, std::string id, StringData ns = kTestNs) {
+        _mock->queue.push_back(
+            Document({{"_id", Document({{"ts", ts}, {"ns", ns}, {"_id", id}})}}));
+    }
+
+    void addPause() {
+        _mock->queue.push_back(DocumentSource::GetNextResult::makePauseExecution());
+    }
+
+    /**
+     * Convenience method to create the class under test with a given timestamp, id, and namespace.
+     */
+    intrusive_ptr<DocumentSourceCheckResumeToken> createCheckResumeToken(Timestamp ts,
+                                                                         StringData id,
+                                                                         StringData ns = kTestNs) {
+        auto token = ResumeToken::parse(BSON("ts" << ts << "_id" << id << "ns" << ns));
+        DocumentSourceCheckResumeTokenSpec spec;
+        spec.setResumeToken(token);
+        auto checkResumeToken = DocumentSourceCheckResumeToken::create(getExpCtx(), spec);
+        checkResumeToken->setSource(_mock.get());
+        return checkResumeToken;
+    }
+
+private:
+    intrusive_ptr<DocumentSourceMock> _mock;
+};
+
+TEST_F(CheckResumeTokenTest, ShouldSucceedWithOnlyResumeToken) {
+    Timestamp resumeTimestamp(100, 1);
+
+    auto checkResumeToken = createCheckResumeToken(resumeTimestamp, "1");
+    addDocument(resumeTimestamp, "1");
+    // We should not see the resume token.
+    ASSERT_TRUE(checkResumeToken->getNext().isEOF());
+}
+
+TEST_F(CheckResumeTokenTest, ShouldSucceedWithPausesBeforeResumeToken) {
+    Timestamp resumeTimestamp(100, 1);
+
+    auto checkResumeToken = createCheckResumeToken(resumeTimestamp, "1");
+    addPause();
+    addDocument(resumeTimestamp, "1");
+
+    // We see the pause we inserted, but not the resume token.
+    ASSERT_TRUE(checkResumeToken->getNext().isPaused());
+    ASSERT_TRUE(checkResumeToken->getNext().isEOF());
+}
+
+TEST_F(CheckResumeTokenTest, ShouldSucceedWithPausesAfterResumeToken) {
+    Timestamp resumeTimestamp(100, 1);
+    Timestamp doc1Timestamp(100, 2);
+
+    auto checkResumeToken = createCheckResumeToken(resumeTimestamp, "1");
+    addDocument(resumeTimestamp, "1");
+    addPause();
+    addDocument(doc1Timestamp, "2");
+
+    // Pause added explicitly.
+    ASSERT_TRUE(checkResumeToken->getNext().isPaused());
+    // The document after the resume token should be the first.
+    auto result1 = checkResumeToken->getNext();
+    ASSERT_TRUE(result1.isAdvanced());
+    auto& doc1 = result1.getDocument();
+    ASSERT_VALUE_EQ(Value(doc1Timestamp), doc1["_id"].getDocument()["ts"]);
+    ASSERT_TRUE(checkResumeToken->getNext().isEOF());
+}
+
+TEST_F(CheckResumeTokenTest, ShouldSucceedWithMultipleDocumentsAfterResumeToken) {
+    Timestamp resumeTimestamp(100, 1);
+
+    auto checkResumeToken = createCheckResumeToken(resumeTimestamp, "0");
+    addDocument(resumeTimestamp, "0");
+
+    Timestamp doc1Timestamp(100, 2);
+    Timestamp doc2Timestamp(101, 1);
+    addDocument(doc1Timestamp, "1");
+    addDocument(doc2Timestamp, "2");
+
+    auto result1 = checkResumeToken->getNext();
+    ASSERT_TRUE(result1.isAdvanced());
+    auto& doc1 = result1.getDocument();
+    ASSERT_VALUE_EQ(Value(doc1Timestamp), doc1["_id"].getDocument()["ts"]);
+    auto result2 = checkResumeToken->getNext();
+    ASSERT_TRUE(result2.isAdvanced());
+    auto& doc2 = result2.getDocument();
+    ASSERT_VALUE_EQ(Value(doc2Timestamp), doc2["_id"].getDocument()["ts"]);
+    ASSERT_TRUE(checkResumeToken->getNext().isEOF());
+}
+
+TEST_F(CheckResumeTokenTest, ShouldFailIfFirstDocHasWrongResumeToken) {
+    Timestamp resumeTimestamp(100, 1);
+
+    auto checkResumeToken = createCheckResumeToken(resumeTimestamp, "1");
+
+    Timestamp doc1Timestamp(100, 2);
+    Timestamp doc2Timestamp(101, 1);
+    addDocument(doc1Timestamp, "1");
+    addDocument(doc2Timestamp, "2");
+    ASSERT_THROWS_CODE(checkResumeToken->getNext(), UserException, 40585);
+}
+
+TEST_F(CheckResumeTokenTest, ShouldFailIfTokenHasWrongDocumentId) {
+    Timestamp resumeTimestamp(100, 1);
+
+    auto checkResumeToken = createCheckResumeToken(resumeTimestamp, "0");
+    addDocument(resumeTimestamp, "1");
+    ASSERT_THROWS_CODE(checkResumeToken->getNext(), UserException, 40585);
+}
+
+TEST_F(CheckResumeTokenTest, ShouldFailIfTokenHasWrongNamespace) {
+    Timestamp resumeTimestamp(100, 1);
+
+    auto checkResumeToken = createCheckResumeToken(resumeTimestamp, "1", "test1.ns");
+    addDocument(resumeTimestamp, "1", "test2.ns");
+    ASSERT_THROWS_CODE(checkResumeToken->getNext(), UserException, 40585);
+}
+
+/**
+ * We should _error_ on the no-document case, because that means the resume token was not found.
+ */
+TEST_F(CheckResumeTokenTest, ShouldFailWithNoDocuments) {
+    Timestamp resumeTimestamp(100, 1);
+
+    auto checkResumeToken = createCheckResumeToken(resumeTimestamp, "0");
+    ASSERT_THROWS_CODE(checkResumeToken->getNext(), UserException, 40584);
+}
+
+}  // namespace
+}  // namespace mongo