/**
 * 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.ozone.protocol.proto";
option java_outer_classname = "KeySpaceManagerProtocolProtos";
option java_generic_services = true;
option java_generate_equals_and_hash = true;
package hadoop.hdfs.ozone;

/**
This is file contains the protocol to communicate with
Ozone key space manager. Ozone KSM manages the namespace for ozone.
This is similar to Namenode for Ozone.
*/

import "hdfs.proto";
import "Ozone.proto";

enum Status {
    OK = 1;
    VOLUME_NOT_UNIQUE = 2;
    VOLUME_NOT_FOUND = 3;
    VOLUME_NOT_EMPTY = 4;
    VOLUME_ALREADY_EXISTS = 5;
    USER_NOT_FOUND = 6;
    USER_TOO_MANY_VOLUMES = 7;
    BUCKET_NOT_FOUND = 8;
    BUCKET_NOT_EMPTY = 9;
    BUCKET_ALREADY_EXISTS = 10;
    KEY_ALREADY_EXISTS = 11;
    KEY_NOT_FOUND = 12;
    ACCESS_DENIED = 13;
    INTERNAL_ERROR = 14;
}


message VolumeInfo {
    required string adminName = 1;
    required string ownerName = 2;
    required string volume = 3;
    optional uint64 quotaInBytes = 4;
    repeated KeyValue metadata = 5;
    repeated OzoneAclInfo volumeAcls = 6;
}

/**
    Creates a volume
*/
message CreateVolumeRequest {
    required VolumeInfo volumeInfo = 1;
}

message CreateVolumeResponse {

    required Status status = 1;
}

message VolumeList {
    repeated string volumeNames = 1;
}

/**
    Changes the Volume Properties -- like ownership and quota for a volume.
*/
message SetVolumePropertyRequest {
    required string volumeName = 1;
    optional string ownerName = 2;
    optional uint64 quotaInBytes = 3;
}

message SetVolumePropertyResponse {
    required Status status = 1;
}

/**
 * Checks if the user has specified permissions for the volume
 */
message CheckVolumeAccessRequest {
    required string volumeName = 1;
    required OzoneAclInfo userAcl = 2;
}

message CheckVolumeAccessResponse {

    required Status status = 1;
}


/**
    Returns information about a volume.
*/

message InfoVolumeRequest {
    required string volumeName = 1;
}

message InfoVolumeResponse {
    required Status status = 1;
    optional VolumeInfo volumeInfo = 2;

}

/**
    Deletes an existing volume.
*/
message DeleteVolumeRequest {
    required string volumeName = 1;
}

message DeleteVolumeResponse {
    required Status status = 1;
}


/**
    List Volumes -- List all volumes in the cluster or by user.
*/

message ListVolumeRequest {
    enum Scope {
        USER_VOLUMES = 1;   // User volumes -- called by user
        VOLUMES_BY_USER = 2; // User volumes - called by Admin
        VOLUMES_BY_CLUSTER = 3; // All volumes in the cluster
    }
    required Scope scope = 1;
    required string volumeName = 2;
    optional string userName = 3;
    optional string prefix = 4;
    optional string prevKey = 5;
    optional uint64 maxKeys = 6;
}

message ListVolumeResponse {
    enum Status {
        OK = 1;
        ACCESS_DENIED = 2;
        REQUIRED_ARG_MISSING = 3;
    }
    required Status status = 1;
    repeated VolumeInfo volumeInfo = 2;
}

message BucketInfo {
    required string volumeName = 1;
    required string bucketName = 2;
    repeated OzoneAclInfo acls = 3;
    required bool isVersionEnabled = 4 [default = false];
    required StorageTypeProto storageType = 5 [default = DISK];
}

message BucketArgs {
    required string volumeName = 1;
    required string bucketName = 2;
    repeated OzoneAclInfo addAcls = 3;
    repeated OzoneAclInfo removeAcls = 4;
    optional bool isVersionEnabled = 5;
    optional StorageTypeProto storageType = 6;
}

message OzoneAclInfo {
    enum OzoneAclType {
        USER = 1;
        GROUP = 2;
        WORLD = 3;
    }
    enum OzoneAclRights {
        READ = 1;
        WRITE = 2;
        READ_WRITE = 3;
    }
    required OzoneAclType type = 1;
    required string name = 2;
    required OzoneAclRights rights = 3;
}

message CreateBucketRequest {
    required BucketInfo bucketInfo = 1;
}

message CreateBucketResponse {
    required Status status = 1;
}

message InfoBucketRequest {
    required string volumeName = 1;
    required string bucketName = 2;
}

message InfoBucketResponse {
    required Status status = 1;
    optional BucketInfo bucketInfo = 2;

}


message KeyArgs {
    required string volumeName = 1;
    required string bucketName = 2;
    required string keyName = 3;
    optional uint64 dataSize = 4;
}

message KeyInfo {
    required string volumeName = 1;
    required string bucketName = 2;
    required string keyName = 3;
    required uint64 dataSize = 4;
    required string blockKey = 5;
    required string containerName = 6;
    required bool shouldCreateContainer = 7;
}

message LocateKeyRequest {
    required KeyArgs keyArgs = 1;
}

message LocateKeyResponse {
    required Status status = 1;
    optional KeyInfo keyInfo = 2;
}

message SetBucketPropertyRequest {
    required BucketArgs bucketArgs = 1;
}

message SetBucketPropertyResponse {
    required Status status = 1;
}

message DeleteBucketRequest {
    required string volumeName = 1;
    required string bucketName = 2;
}

message DeleteBucketResponse {
    required Status status = 1;
}


/**
 The KSM service that takes care of Ozone namespace.
*/
service KeySpaceManagerService {

    /**
        Creates a Volume.
    */
    rpc createVolume(CreateVolumeRequest)
        returns(CreateVolumeResponse);

    /**
        Allows modificiation of volume properties.
    */
    rpc setVolumeProperty(SetVolumePropertyRequest)
        returns (SetVolumePropertyResponse);

    /**
        Checks if the specified volume is accesible by the specified user.
    */
    rpc checkVolumeAccess(CheckVolumeAccessRequest)
        returns (CheckVolumeAccessResponse);

    /**
        Gets Volume information.
    */
    rpc infoVolume(InfoVolumeRequest)
        returns(InfoVolumeResponse);
    /**
        Deletes a volume if it is empty.
    */
    rpc deleteVolume(DeleteVolumeRequest)
        returns (DeleteVolumeResponse);

    /**
        Lists Volumes
    */
    rpc listVolumes(ListVolumeRequest)
        returns (ListVolumeResponse);

    /**
        Creates a Bucket.
    */
    rpc createBucket(CreateBucketRequest)
        returns(CreateBucketResponse);

    /**
        Get Bucket information.
    */
    rpc infoBucket(InfoBucketRequest)
        returns(InfoBucketResponse);

    /**
        Sets bucket properties.
    */
    rpc setBucketProperty(SetBucketPropertyRequest)
        returns(SetBucketPropertyResponse);

    /**
        Get key.
    */
    rpc createKey(LocateKeyRequest)
        returns(LocateKeyResponse);

    /**
       Look up for an existing key.
    */
    rpc lookupKey(LocateKeyRequest)
        returns(LocateKeyResponse);

    /**
       Delete an existing key.
    */
    rpc deleteKey(LocateKeyRequest)
        returns(LocateKeyResponse);

    /**
       Deletes a bucket from volume if it is empty.
    */
    rpc deleteBucket(DeleteBucketRequest)
        returns (DeleteBucketResponse);
}