From 3b758994b8922dc99aa891d0b6c5a5ddcbc91307 Mon Sep 17 00:00:00 2001
From: matt dannenberg <matt.dannenberg@10gen.com>
Date: Wed, 15 Jul 2015 08:21:17 -0400
Subject: SERVER-19205 change all ReadAfterOpTime objects to be ReadConcern
 objects

---
 src/mongo/db/repl/read_concern_args.cpp | 127 ++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 src/mongo/db/repl/read_concern_args.cpp

(limited to 'src/mongo/db/repl/read_concern_args.cpp')

diff --git a/src/mongo/db/repl/read_concern_args.cpp b/src/mongo/db/repl/read_concern_args.cpp
new file mode 100644
index 00000000000..34141a5f53b
--- /dev/null
+++ b/src/mongo/db/repl/read_concern_args.cpp
@@ -0,0 +1,127 @@
+/**
+ *    Copyright (C) 2015 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::kReplication
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/db/repl/read_concern_args.h"
+
+#include "mongo/bson/util/bson_extract.h"
+#include "mongo/db/jsobj.h"
+#include "mongo/util/mongoutils/str.h"
+
+using std::string;
+
+namespace mongo {
+namespace repl {
+
+const string ReadConcernArgs::kReadConcernFieldName("readConcern");
+const string ReadConcernArgs::kOpTimeFieldName("afterOpTime");
+const string ReadConcernArgs::kOpTimestampFieldName("ts");
+const string ReadConcernArgs::kOpTermFieldName("term");
+const string ReadConcernArgs::kLevelFieldName("level");
+
+ReadConcernArgs::ReadConcernArgs() : ReadConcernArgs(OpTime(), ReadConcernLevel::kLocalReadConcern) {}
+
+ReadConcernArgs::ReadConcernArgs(OpTime opTime, ReadConcernLevel level)
+    : _opTime(std::move(opTime)), _level(level) {}
+
+ReadConcernArgs::ReadConcernLevel ReadConcernArgs::getLevel() const {
+    return _level;
+}
+
+const OpTime& ReadConcernArgs::getOpTime() const {
+    return _opTime;
+}
+
+Status ReadConcernArgs::initialize(const BSONObj& cmdObj) {
+    auto readConcernElem = cmdObj[ReadConcernArgs::kReadConcernFieldName];
+
+    if (readConcernElem.eoo()) {
+        return Status::OK();
+    }
+
+    if (!readConcernElem.isABSONObj()) {
+        return Status(ErrorCodes::FailedToParse,
+                      str::stream() << kReadConcernFieldName << " field should be an object");
+    }
+
+    BSONObj readConcernObj = readConcernElem.Obj();
+    BSONElement opTimeElem;
+    auto opTimeStatus =
+        bsonExtractTypedField(readConcernObj, kOpTimeFieldName, Object, &opTimeElem);
+
+    if (opTimeStatus.isOK()) {
+        BSONObj opTimeObj = opTimeElem.Obj();
+        BSONElement timestampElem;
+
+        Timestamp timestamp;
+        auto timestampStatus =
+            bsonExtractTimestampField(opTimeObj, kOpTimestampFieldName, &timestamp);
+
+        if (!timestampStatus.isOK()) {
+            return timestampStatus;
+        }
+
+        long long termNumber;
+        auto termStatus = bsonExtractIntegerField(opTimeObj, kOpTermFieldName, &termNumber);
+
+        if (!termStatus.isOK()) {
+            return termStatus;
+        }
+
+        _opTime = OpTime(timestamp, termNumber);
+    } else if (opTimeStatus != ErrorCodes::NoSuchKey) {
+        return opTimeStatus;
+    }
+
+    std::string levelString;
+    auto readCommittedStatus =
+        bsonExtractStringField(readConcernObj, kLevelFieldName, &levelString);
+    if (readCommittedStatus.isOK()) {
+        if (levelString == "local") {
+            _level = ReadConcernLevel::kLocalReadConcern;
+        } else if (levelString == "majority") {
+            _level = ReadConcernLevel::kMajorityReadConcern;
+        } else {
+            return Status(ErrorCodes::FailedToParse,
+                          str::stream() << kReadConcernFieldName << '.' << kLevelFieldName
+                                        << " must be either \"local\" or \"majority\"");
+        }
+    } else if (readCommittedStatus == ErrorCodes::NoSuchKey) {
+        _level = ReadConcernLevel::kLocalReadConcern;
+    } else {
+        return readCommittedStatus;
+    }
+
+    return Status::OK();
+}
+
+}  // namespace repl
+}  // namespace mongo
-- 
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