SERVER-22656 Move _recvChunkStart command parsing to separate class

1 files changed, 136 insertions, 0 deletions

diff --git a/src/mongo/db/s/start_chunk_clone_request.h b/src/mongo/db/s/start_chunk_clone_request.h
new file mode 100644
index 00000000000..d88085e764c
--- /dev/null
+++ b/src/mongo/db/s/start_chunk_clone_request.h
@@ -0,0 +1,136 @@
+/**
+ *    Copyright (C) 2016 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.
+ */
+
+#pragma once
+
+#include <string>
+
+#include "mongo/client/connection_string.h"
+#include "mongo/db/namespace_string.h"
+#include "mongo/db/s/migration_session_id.h"
+#include "mongo/s/migration_secondary_throttle_options.h"
+
+namespace mongo {
+
+class BSONObjBuilder;
+template <typename T>
+class StatusWith;
+
+/**
+ * Parses the arguments for a start chunk clone operation.
+ */
+class StartChunkCloneRequest {
+public:
+    /**
+     * Parses the input command and produces a request corresponding to its arguments.
+     */
+    static StatusWith<StartChunkCloneRequest> createFromCommand(NamespaceString nss,
+                                                                const BSONObj& obj);
+
+    /**
+     * Constructs a start chunk clone command with the specified parameters and writes it to the
+     * builder, without closing the builder. The builder must be empty, but callers are free to
+     * append more fields once the command has been constructed.
+     */
+    static void appendAsCommand(BSONObjBuilder* builder,
+                                const NamespaceString& nss,
+                                const MigrationSessionId& sessionId,
+                                const ConnectionString& configServerConnectionString,
+                                const std::string& fromShardId,
+                                const std::string& toShardId,
+                                const BSONObj& chunkMinKey,
+                                const BSONObj& chunkMaxKey,
+                                const BSONObj& shardKeyPattern,
+                                const MigrationSecondaryThrottleOptions& secondaryThrottle);
+
+    const NamespaceString& getNss() const {
+        return _nss;
+    }
+
+    const ConnectionString& getConfigServerCS() const {
+        return _configServerCS;
+    }
+
+    const std::string& getFromShardId() const {
+        return _fromShardId;
+    }
+
+    const std::string& getToShardId() const {
+        return _toShardId;
+    }
+
+    const BSONObj& getMinKey() const {
+        return _minKey;
+    }
+
+    const BSONObj& getMaxKey() const {
+        return _maxKey;
+    }
+
+    const BSONObj& getShardKeyPattern() const {
+        return _shardKeyPattern;
+    }
+
+    const MigrationSecondaryThrottleOptions& getSecondaryThrottle() const {
+        return _secondaryThrottle;
+    }
+
+private:
+    StartChunkCloneRequest(NamespaceString nss,
+                           MigrationSessionId sessionId,
+                           MigrationSecondaryThrottleOptions secondaryThrottle);
+
+    // The collection for which this request applies
+    NamespaceString _nss;
+
+    // The session id of this migration
+    MigrationSessionId _sessionId;
+
+    // Connections string for the config server. This is a legacy field and is used in order to
+    // initialize the sharding state on the donor shard in case it doesn't yet know that it is part
+    // of a sharded system.
+    ConnectionString _configServerCS;
+
+    // The source shard id
+    std::string _fromShardId;
+
+    // The recipient shard id
+    std::string _toShardId;
+
+    // Exact min and max key of the chunk being moved
+    BSONObj _minKey;
+    BSONObj _maxKey;
+
+    // Shard key pattern used by the collection
+    BSONObj _shardKeyPattern;
+
+    // The parsed secondary throttle options
+    MigrationSecondaryThrottleOptions _secondaryThrottle;
+};
+
+}  // namespace mongo