/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * These .proto interfaces are private and unstable.
 * Please see http://wiki.apache.org/hadoop/Compatibility
 * for what changes are allowed for a *unstable* .proto interface.
 */
option java_package = "org.apache.hadoop.cblock.protocol.proto";
option java_outer_classname = "CBlockClientServerProtocolProtos";
option java_generic_services = true;
option java_generate_equals_and_hash = true;
package hadoop.cblock;

import "hdds.proto";
import "CBlockServiceProtocol.proto";
/**
* This message is sent from CBlock client side to CBlock server to
* mount a volume specified by owner name and volume name.
*
* Right now, this is the only communication between client and server.
* After the volume is mounted, CBlock client will talk to containers
* by itself, nothing to do with CBlock server.
*/
message MountVolumeRequestProto {
    required string userName = 1;
    required string volumeName = 2;
}

/**
* This message is sent from CBlock server to CBlock client as response
* of mount a volume. It checks the whether the volume is valid to access
* at all.(e.g. volume exist)
*
* And include enough information (volume size, block size, list of
* containers for this volume) for client side to perform read/write on
* the volume.
*/
message MountVolumeResponseProto {
    required bool isValid = 1;
    optional string userName = 2;
    optional string volumeName = 3;
    optional uint64 volumeSize = 4;
    optional uint32 blockSize = 5;
    repeated ContainerIDProto allContainerIDs = 6;
}

/**
* This message include ID of container which can be used to locate the
* container. Since the order of containers needs to be maintained, also
* includes a index field to verify the correctness of the order.
*/
message ContainerIDProto {
    required string containerID = 1;
    required uint64 index = 2;
    // making pipeline optional to be compatible with exisiting tests
    optional hadoop.hdds.Pipeline pipeline = 3;
}


message ListVolumesRequestProto {

}

message ListVolumesResponseProto {
    repeated VolumeInfoProto volumeEntry = 1;
}


service CBlockClientServerProtocolService {
    /**
    * mount the volume.
    */
    rpc mountVolume(MountVolumeRequestProto) returns (MountVolumeResponseProto);

    rpc listVolumes(ListVolumesRequestProto) returns(ListVolumesResponseProto);

}