SERVER-28300 Implement mock libraries to test logical session cache

1 files changed, 158 insertions, 0 deletions

diff --git a/src/mongo/db/sessions_collection_mock.cpp b/src/mongo/db/sessions_collection_mock.cpp
new file mode 100644
index 00000000000..a56f6dec21a
--- /dev/null
+++ b/src/mongo/db/sessions_collection_mock.cpp
@@ -0,0 +1,158 @@
+/**
+ *    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/db/sessions_collection_mock.h"
+#include "mongo/platform/basic.h"
+#include "mongo/stdx/functional.h"
+
+namespace mongo {
+
+MockSessionsCollectionImpl::MockSessionsCollectionImpl()
+    : _sessions(),
+      _fetch(stdx::bind(&MockSessionsCollectionImpl::_fetchRecord, this, stdx::placeholders::_1)),
+      _insert(stdx::bind(&MockSessionsCollectionImpl::_insertRecord, this, stdx::placeholders::_1)),
+      _refresh(
+          stdx::bind(&MockSessionsCollectionImpl::_refreshSessions, this, stdx::placeholders::_1)),
+      _remove(
+          stdx::bind(&MockSessionsCollectionImpl::_removeRecords, this, stdx::placeholders::_1)) {}
+
+void MockSessionsCollectionImpl::setFetchHook(FetchHook hook) {
+    _fetch = std::move(hook);
+}
+
+void MockSessionsCollectionImpl::setInsertHook(InsertHook hook) {
+    _insert = std::move(hook);
+}
+
+void MockSessionsCollectionImpl::setRefreshHook(RefreshHook hook) {
+    _refresh = std::move(hook);
+}
+
+void MockSessionsCollectionImpl::setRemoveHook(RemoveHook hook) {
+    _remove = std::move(hook);
+}
+
+void MockSessionsCollectionImpl::clearHooks() {
+    _fetch = stdx::bind(&MockSessionsCollectionImpl::_fetchRecord, this, stdx::placeholders::_1);
+    _insert = stdx::bind(&MockSessionsCollectionImpl::_insertRecord, this, stdx::placeholders::_1);
+    _refresh =
+        stdx::bind(&MockSessionsCollectionImpl::_refreshSessions, this, stdx::placeholders::_1);
+    _remove = stdx::bind(&MockSessionsCollectionImpl::_removeRecords, this, stdx::placeholders::_1);
+}
+
+StatusWith<LogicalSessionRecord> MockSessionsCollectionImpl::fetchRecord(LogicalSessionId lsid) {
+    return _fetch(std::move(lsid));
+}
+
+Status MockSessionsCollectionImpl::insertRecord(LogicalSessionRecord record) {
+    return _insert(std::move(record));
+}
+
+MockSessionsCollectionImpl::SessionList MockSessionsCollectionImpl::refreshSessions(
+    SessionList sessions) {
+    return _refresh(std::move(sessions));
+}
+
+void MockSessionsCollectionImpl::removeRecords(SessionList sessions) {
+    _remove(std::move(sessions));
+}
+
+void MockSessionsCollectionImpl::add(LogicalSessionRecord record) {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    _sessions.insert({record.getLsid(), std::move(record)});
+}
+
+void MockSessionsCollectionImpl::remove(LogicalSessionId lsid) {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    _sessions.erase(lsid);
+}
+
+bool MockSessionsCollectionImpl::has(LogicalSessionId lsid) {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    return _sessions.find(lsid) != _sessions.end();
+}
+
+void MockSessionsCollectionImpl::clearSessions() {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    _sessions.clear();
+}
+
+const MockSessionsCollectionImpl::SessionMap& MockSessionsCollectionImpl::sessions() const {
+    return _sessions;
+}
+
+StatusWith<LogicalSessionRecord> MockSessionsCollectionImpl::_fetchRecord(LogicalSessionId lsid) {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+
+    // If we do not have this record, return an error
+    auto it = _sessions.find(lsid);
+    if (it == _sessions.end()) {
+        return {ErrorCodes::NoSuchSession, "No matching record in the sessions collection"};
+    }
+
+    return it->second;
+}
+
+Status MockSessionsCollectionImpl::_insertRecord(LogicalSessionRecord record) {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    auto res = _sessions.insert({record.getLsid(), std::move(record)});
+
+    // We should never try to insert the same record twice. In theory this could
+    // happen because of a UUID conflict.
+    if (!res.second) {
+        return {ErrorCodes::DuplicateSession, "Session already exists in the sessions collection"};
+    }
+
+    return Status::OK();
+}
+
+MockSessionsCollectionImpl::SessionList MockSessionsCollectionImpl::_refreshSessions(
+    SessionList sessions) {
+    SessionList notFound{};
+
+    {
+        stdx::unique_lock<stdx::mutex> lk(_mutex);
+        for (auto& lsid : sessions) {
+            auto it = _sessions.find(lsid);
+            if (it == _sessions.end()) {
+                notFound.push_back(lsid);
+            }
+        }
+    }
+
+    return notFound;
+}
+
+void MockSessionsCollectionImpl::_removeRecords(SessionList sessions) {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    for (auto& lsid : sessions) {
+        _sessions.erase(lsid);
+    }
+}
+
+}  // namespace mongo