SERVER-48815 Create TenantAllDatabaseCloner

1 files changed, 125 insertions, 0 deletions

diff --git a/src/mongo/db/repl/tenant_all_database_cloner.h b/src/mongo/db/repl/tenant_all_database_cloner.h
new file mode 100644
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+++ b/src/mongo/db/repl/tenant_all_database_cloner.h
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+/**
+ *    Copyright (C) 2020-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
+
+#include <vector>
+
+#include "mongo/db/repl/base_cloner.h"
+#include "mongo/db/repl/tenant_database_cloner.h"
+
+namespace mongo {
+namespace repl {
+
+class TenantAllDatabaseCloner final : public BaseCloner {
+public:
+    struct Stats {
+        size_t databasesCloned{0};
+        std::vector<TenantDatabaseCloner::Stats> databaseStats;
+
+        std::string toString() const;
+        BSONObj toBSON() const;
+        void append(BSONObjBuilder* builder) const;
+    };
+
+    TenantAllDatabaseCloner(InitialSyncSharedData* sharedData,
+                            const HostAndPort& source,
+                            DBClientConnection* client,
+                            StorageInterface* storageInterface,
+                            ThreadPool* dbPool,
+                            StringData databasePrefix);
+
+    virtual ~TenantAllDatabaseCloner() = default;
+
+    Stats getStats() const;
+
+    std::string toString() const;
+
+    Timestamp getOperationTime_forTest();
+
+protected:
+    ClonerStages getStages() final;
+
+private:
+    friend class TenantAllDatabaseClonerTest;
+
+    class TenantAllDatabaseClonerStage : public ClonerStage<TenantAllDatabaseCloner> {
+    public:
+        TenantAllDatabaseClonerStage(std::string name,
+                                     TenantAllDatabaseCloner* cloner,
+                                     ClonerRunFn stageFunc)
+            : ClonerStage<TenantAllDatabaseCloner>(name, cloner, stageFunc) {}
+
+        bool isTransientError(const Status& status) override {
+            // Always abort on error.
+            return false;
+        }
+    };
+
+    /**
+     * Stage function that retrieves database information from the sync source.
+     */
+    AfterStageBehavior listDatabasesStage();
+
+    /**
+     *
+     * The postStage creates and runs the individual TenantDatabaseCloners on each database found on
+     * the sync source.
+     */
+    void postStage() final;
+
+    std::string describeForFuzzer(BaseClonerStage* stage) const final {
+        return "admin db: { " + stage->getName() + ": 1 }";
+    }
+
+    // All member variables are labeled with one of the following codes indicating the
+    // synchronization rules for accessing them.
+    //
+    // (R)  Read-only in concurrent operation; no synchronization required.
+    // (S)  Self-synchronizing; access according to classes own rules.
+    // (M)  Reads and writes guarded by _mutex (defined in base class).
+    // (X)  Access only allowed from the main flow of control called from run() or constructor.
+    // (MX) Write access with mutex from main flow of control, read access with mutex from other
+    //      threads, read access allowed from main flow without mutex.
+    std::vector<std::string> _databases;                           // (X)
+    std::unique_ptr<TenantDatabaseCloner> _currentDatabaseCloner;  // (MX)
+
+    // The database name prefix of the tenant associated with this migration.
+    std::string _databasePrefix;  // (R)
+
+    TenantAllDatabaseClonerStage _listDatabasesStage;  // (R)
+
+    // The operationTime returned with the listDatabases result.
+    Timestamp _operationTime;  // (X)
+
+    Stats _stats;  // (MX)
+};
+
+}  // namespace repl
+}  // namespace mongo