3 files changed, 72 insertions, 0 deletions

diff --git a/src/mongo/logv2/log_format.h b/src/mongo/logv2/log_format.h
new file mode 100644
index 00000000000..cfd575af6ef
--- /dev/null
+++ b/src/mongo/logv2/log_format.h
@@ -0,0 +1,36 @@
+/**
+ *    Copyright (C) 2019-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    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
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    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 Server Side 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.
+ */
+
+#pragma once
+
+namespace mongo {
+namespace logv2 {
+enum class LogFormat { kDefault, kText, kJson };
+}  // namespace logv2
+}  // namespace mongo
diff --git a/src/mongo/logv2/log_manager.cpp b/src/mongo/logv2/log_manager.cpp
index 420665fa62f..b7887864867 100644
--- a/src/mongo/logv2/log_manager.cpp
+++ b/src/mongo/logv2/log_manager.cpp
@@ -145,6 +145,19 @@ struct LogManager::Impl {
         _rotatableFileBackend->set_formatter(TextFormatter());
     }
 
+    template <class Formatter>
+    void setFormatterToAllBackends() {
+        _consoleBackend->set_formatter(Formatter());
+        _globalLogCacheBackend->set_formatter(Formatter());
+        _startupWarningsBackend->set_formatter(Formatter());
+        if (_rotatableFileBackend)
+            _rotatableFileBackend->set_formatter(Formatter());
+#ifndef _WIN32
+        if (_syslogBackend)
+            _syslogBackend->set_formatter(Formatter());
+#endif
+    }
+
     LogDomain _globalDomain{std::make_unique<LogDomainGlobal>()};
     // I think that, technically, these are logging front ends
     // and that they get to hold or wrap a backend
@@ -155,6 +168,7 @@ struct LogManager::Impl {
 #endif
     boost::shared_ptr<RamLogBackend> _globalLogCacheBackend;
     boost::shared_ptr<RamLogBackend> _startupWarningsBackend;
+    LogFormat _format{LogFormat::kDefault};
     bool _defaultBackendsAttached{false};
 };
 
@@ -182,6 +196,24 @@ LogDomain& LogManager::getGlobalDomain() {
     return _impl->_globalDomain;
 }
 
+void LogManager::setOutputFormat(LogFormat format) {
+    if (_impl->_format != format) {
+        switch (format) {
+            case LogFormat::kText:
+                _impl->setFormatterToAllBackends<TextFormatter>();
+                break;
+
+            case LogFormat::kJson:
+                _impl->setFormatterToAllBackends<JsonFormatter>();
+                break;
+
+            default:
+                break;
+        };
+        _impl->_format = format;
+    }
+}
+
 void LogManager::detachDefaultBackends() {
     invariant(isDefaultBackendsAttached());
 
diff --git a/src/mongo/logv2/log_manager.h b/src/mongo/logv2/log_manager.h
index 69df533ab9a..7e8f1499154 100644
--- a/src/mongo/logv2/log_manager.h
+++ b/src/mongo/logv2/log_manager.h
@@ -29,6 +29,8 @@
 
 #pragma once
 
+#include "mongo/logv2/log_format.h"
+
 #include <memory>
 #include <string>
 
@@ -58,6 +60,8 @@ public:
      */
     LogDomain& getGlobalDomain();
 
+    void setOutputFormat(LogFormat format);
+
     /**
      * Detaches the default log backends
      *