SERVER-24817 Hook up clusterID into places that need it

1 files changed, 101 insertions, 0 deletions

diff --git a/src/mongo/s/cluster_identity_loader.cpp b/src/mongo/s/cluster_identity_loader.cpp
new file mode 100644
index 00000000000..b97c30bab08
--- /dev/null
+++ b/src/mongo/s/cluster_identity_loader.cpp
@@ -0,0 +1,101 @@
+/**
+ *    Copyright (C) 2016 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.
+ */
+
+#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/s/cluster_identity_loader.h"
+
+#include "mongo/base/status_with.h"
+#include "mongo/db/operation_context.h"
+#include "mongo/db/service_context.h"
+#include "mongo/s/catalog/sharding_catalog_client.h"
+#include "mongo/s/catalog/type_config_version.h"
+#include "mongo/s/grid.h"
+
+namespace mongo {
+namespace {
+
+const auto getClusterIdentity = ServiceContext::declareDecoration<ClusterIdentityLoader>();
+
+}  // namespace
+
+ClusterIdentityLoader* ClusterIdentityLoader::get(ServiceContext* serviceContext) {
+    return &getClusterIdentity(serviceContext);
+}
+
+ClusterIdentityLoader* ClusterIdentityLoader::get(OperationContext* operationContext) {
+    return ClusterIdentityLoader::get(operationContext->getServiceContext());
+}
+
+StatusWith<OID> ClusterIdentityLoader::getClusterId(OperationContext* txn) {
+    stdx::unique_lock<stdx::mutex> lk(_mutex);
+    if (_initializationState == InitializationState::kInitialized) {
+        invariant(_lastLoadResult.isOK());
+        return _lastLoadResult;
+    }
+
+    if (_initializationState == InitializationState::kLoading) {
+        while (_initializationState == InitializationState::kLoading) {
+            _inReloadCV.wait(lk);
+        }
+        return _lastLoadResult;
+    }
+
+    invariant(_initializationState == InitializationState::kUninitialized);
+    _initializationState = InitializationState::kLoading;
+
+    lk.unlock();
+    auto loadStatus = _loadClusterId(txn);
+    lk.lock();
+
+    invariant(_initializationState == InitializationState::kLoading);
+    _lastLoadResult = std::move(loadStatus);
+    if (_lastLoadResult.isOK()) {
+        _initializationState = InitializationState::kInitialized;
+    } else {
+        _initializationState = InitializationState::kUninitialized;
+    }
+    _inReloadCV.notify_all();
+    return _lastLoadResult;
+}
+
+StatusWith<OID> ClusterIdentityLoader::_loadClusterId(OperationContext* txn) {
+    auto catalogClient = Grid::get(txn)->catalogClient(txn);
+    auto loadResult =
+        catalogClient->getConfigVersion(txn, repl::ReadConcernLevel::kMajorityReadConcern);
+    if (!loadResult.isOK()) {
+        return Status(loadResult.getStatus().code(),
+                      str::stream() << "Error loading clusterID"
+                                    << causedBy(loadResult.getStatus().reason()));
+    }
+    return loadResult.getValue().getClusterId();
+}
+
+}  // namespace mongo