From aa7260c8f699c3c691f836bf2286606b2a8eac93 Mon Sep 17 00:00:00 2001
From: Ben Caimano <ben.caimano@mongodb.com>
Date: Tue, 31 Dec 2019 20:19:14 +0000
Subject: SERVER-44167 Added ability to kill operations by key

There are two patches here really. One of which makes killOp fast to use
and visible. The other adds OperationKey to various places and maps it
to an internal OpId.
---
 src/mongo/db/operation_killer.cpp | 99 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 src/mongo/db/operation_killer.cpp

(limited to 'src/mongo/db/operation_killer.cpp')

diff --git a/src/mongo/db/operation_killer.cpp b/src/mongo/db/operation_killer.cpp
new file mode 100644
index 00000000000..742a9d142e3
--- /dev/null
+++ b/src/mongo/db/operation_killer.cpp
@@ -0,0 +1,99 @@
+/**
+ *    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.
+ */
+
+#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand
+
+#include "mongo/platform/basic.h"
+
+#include "mongo/db/operation_killer.h"
+
+#include "mongo/db/audit.h"
+#include "mongo/db/auth/authorization_session.h"
+#include "mongo/db/client.h"
+#include "mongo/db/operation_key_manager.h"
+#include "mongo/util/assert_util.h"
+#include "mongo/util/log.h"
+
+namespace mongo {
+
+OperationKiller::OperationKiller(Client* myClient) : _myClient(myClient) {
+    invariant(_myClient);
+}
+
+bool OperationKiller::isGenerallyAuthorizedToKill() const {
+    AuthorizationSession* authzSession = AuthorizationSession::get(_myClient);
+    if (authzSession->isAuthorizedForActionsOnResource(ResourcePattern::forClusterResource(),
+                                                       ActionType::killop)) {
+        return true;
+    }
+
+    return false;
+}
+
+bool OperationKiller::isAuthorizedToKill(const LockedClient& target) const {
+    AuthorizationSession* authzSession = AuthorizationSession::get(_myClient);
+
+    if (target && authzSession->isCoauthorizedWithClient(target.client(), target)) {
+        return true;
+    }
+
+    return false;
+}
+
+void OperationKiller::killOperation(OperationId opId) {
+    auto serviceContext = _myClient->getServiceContext();
+
+    auto target = serviceContext->getLockedClient(opId);
+    if (!target) {
+        // There is no operation for opId
+        return;
+    }
+
+    if (!isGenerallyAuthorizedToKill() && !isAuthorizedToKill(target)) {
+        // The client is not authotized to kill this operation
+        return;
+    }
+
+    serviceContext->killOperation(target, target->getOperationContext());
+
+    log() << "Killed operation: " << opId;
+}
+
+void OperationKiller::killOperation(const OperationKey& opKey) {
+    auto opId = OperationKeyManager::get(_myClient).at(opKey);
+
+    if (!opId) {
+        // There is no operation for opKey
+        return;
+    }
+
+    killOperation(*opId);
+}
+
+}  // namespace mongo
-- 
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