SERVER-27543 Create new metadata for oplog queries

1 files changed, 117 insertions, 0 deletions

diff --git a/src/mongo/rpc/metadata/oplog_query_metadata.cpp b/src/mongo/rpc/metadata/oplog_query_metadata.cpp
new file mode 100644
index 00000000000..6ac3f91ea00
--- /dev/null
+++ b/src/mongo/rpc/metadata/oplog_query_metadata.cpp
@@ -0,0 +1,117 @@
+/**
+ *    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/rpc/metadata/oplog_query_metadata.h"
+
+#include "mongo/bson/util/bson_check.h"
+#include "mongo/bson/util/bson_extract.h"
+#include "mongo/db/jsobj.h"
+#include "mongo/db/repl/bson_extract_optime.h"
+#include "mongo/rpc/metadata.h"
+
+namespace mongo {
+namespace rpc {
+
+using repl::OpTime;
+
+const char kOplogQueryMetadataFieldName[] = "$oplogQueryData";
+
+namespace {
+
+const char kLastOpCommittedFieldName[] = "lastOpCommitted";
+const char kLastOpAppliedFieldName[] = "lastOpApplied";
+const char kPrimaryIndexFieldName[] = "primaryIndex";
+const char kSyncSourceIndexFieldName[] = "syncSourceIndex";
+const char kRBIDFieldName[] = "rbid";
+
+}  // unnamed namespace
+
+const int OplogQueryMetadata::kNoPrimary;
+
+OplogQueryMetadata::OplogQueryMetadata(OpTime lastOpCommitted,
+                                       OpTime lastOpApplied,
+                                       int rbid,
+                                       int currentPrimaryIndex,
+                                       int currentSyncSourceIndex)
+    : _lastOpCommitted(std::move(lastOpCommitted)),
+      _lastOpApplied(std::move(lastOpApplied)),
+      _rbid(rbid),
+      _currentPrimaryIndex(currentPrimaryIndex),
+      _currentSyncSourceIndex(currentSyncSourceIndex) {}
+
+StatusWith<OplogQueryMetadata> OplogQueryMetadata::readFromMetadata(const BSONObj& metadataObj) {
+    BSONElement oqMetadataElement;
+
+    Status status = bsonExtractTypedField(
+        metadataObj, rpc::kOplogQueryMetadataFieldName, Object, &oqMetadataElement);
+    if (!status.isOK())
+        return status;
+    BSONObj oqMetadataObj = oqMetadataElement.Obj();
+
+    long long primaryIndex;
+    status = bsonExtractIntegerField(oqMetadataObj, kPrimaryIndexFieldName, &primaryIndex);
+    if (!status.isOK())
+        return status;
+
+    long long syncSourceIndex;
+    status = bsonExtractIntegerField(oqMetadataObj, kSyncSourceIndexFieldName, &syncSourceIndex);
+    if (!status.isOK())
+        return status;
+
+    long long rbid;
+    status = bsonExtractIntegerField(oqMetadataObj, kRBIDFieldName, &rbid);
+    if (!status.isOK())
+        return status;
+
+    repl::OpTime lastOpCommitted;
+    status = bsonExtractOpTimeField(oqMetadataObj, kLastOpCommittedFieldName, &lastOpCommitted);
+    if (!status.isOK())
+        return status;
+
+    repl::OpTime lastOpApplied;
+    status = bsonExtractOpTimeField(oqMetadataObj, kLastOpAppliedFieldName, &lastOpApplied);
+    if (!status.isOK())
+        return status;
+
+    return OplogQueryMetadata(lastOpCommitted, lastOpApplied, rbid, primaryIndex, syncSourceIndex);
+}
+
+Status OplogQueryMetadata::writeToMetadata(BSONObjBuilder* builder) const {
+    BSONObjBuilder oqMetadataBuilder(builder->subobjStart(kOplogQueryMetadataFieldName));
+    _lastOpCommitted.append(&oqMetadataBuilder, kLastOpCommittedFieldName);
+    _lastOpApplied.append(&oqMetadataBuilder, kLastOpAppliedFieldName);
+    oqMetadataBuilder.append(kRBIDFieldName, _rbid);
+    oqMetadataBuilder.append(kPrimaryIndexFieldName, _currentPrimaryIndex);
+    oqMetadataBuilder.append(kSyncSourceIndexFieldName, _currentSyncSourceIndex);
+    oqMetadataBuilder.doneFast();
+
+    return Status::OK();
+}
+
+}  // namespace rpc
+}  // namespace mongo