/**
 * 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 stable.
 * Please see http://wiki.apache.org/hadoop/Compatibility
 * for what changes are allowed for a *stable* .proto interface.
 */

// This file contains protocol buffers that are used throughout HDFS -- i.e.
// by the client, server, and data transfer protocols.


option java_package = "org.apache.hadoop.hdfs.protocol.proto";
option java_outer_classname = "HdfsProtos";
option java_generate_equals_and_hash = true;
package hadoop.hdfs;

import "Security.proto";

/**
 * Extended block idenfies a block
 */
message ExtendedBlockProto {
  required string poolId = 1;   // Block pool id - gloablly unique across clusters
  required uint64 blockId = 2;  // the local id within a pool
  required uint64 generationStamp = 3;
  optional uint64 numBytes = 4 [default = 0];  // len does not belong in ebid 
                                               // here for historical reasons
}

/**
 * Identifies a Datanode
 */
message DatanodeIDProto {
  required string ipAddr = 1;    // IP address
  required string hostName = 2;  // hostname
  required string datanodeUuid = 3;     // UUID assigned to the Datanode. For
                                        // upgraded clusters this is the same
                                        // as the original StorageID of the
                                        // Datanode.
  required uint32 xferPort = 4;  // data streaming port
  required uint32 infoPort = 5;  // datanode http port
  required uint32 ipcPort = 6;   // ipc server port
  optional uint32 infoSecurePort = 7 [default = 0]; // datanode https port
}

/**
 * Datanode local information
 */
message DatanodeLocalInfoProto {
  required string softwareVersion = 1;
  required string configVersion = 2;
  required uint64 uptime = 3;
}

/**
 * DatanodeInfo array
 */
message DatanodeInfosProto {
  repeated DatanodeInfoProto datanodes = 1;
}

/**
 * The status of a Datanode
 */
message DatanodeInfoProto {
  required DatanodeIDProto id = 1;
  optional uint64 capacity = 2 [default = 0];
  optional uint64 dfsUsed = 3 [default = 0];
  optional uint64 remaining = 4 [default = 0];
  optional uint64 blockPoolUsed = 5 [default = 0];
  optional uint64 lastUpdate = 6 [default = 0];
  optional uint32 xceiverCount = 7 [default = 0];
  optional string location = 8;
  enum AdminState {
    NORMAL = 0;
    DECOMMISSION_INPROGRESS = 1;
    DECOMMISSIONED = 2;
  }

  optional AdminState adminState = 10 [default = NORMAL];
  optional uint64 cacheCapacity = 11 [default = 0];
  optional uint64 cacheUsed = 12 [default = 0];
  optional uint64 lastUpdateMonotonic = 13 [default = 0];
  optional string upgradeDomain = 14;
}

/**
 * Represents a storage available on the datanode
 */
message DatanodeStorageProto {
  enum StorageState {
    NORMAL = 0;
    READ_ONLY_SHARED = 1;
  }

  required string storageUuid = 1;
  optional StorageState state = 2 [default = NORMAL];
  optional StorageTypeProto storageType = 3 [default = DISK];
}

message StorageReportProto {
  required string storageUuid = 1 [ deprecated = true ];
  optional bool failed = 2 [ default = false ];
  optional uint64 capacity = 3 [ default = 0 ];
  optional uint64 dfsUsed = 4 [ default = 0 ];
  optional uint64 remaining = 5 [ default = 0 ];
  optional uint64 blockPoolUsed = 6 [ default = 0 ];
  optional DatanodeStorageProto storage = 7; // supersedes StorageUuid
}

/**
 * Summary of a file or directory
 */
message ContentSummaryProto {
  required uint64 length = 1;
  required uint64 fileCount = 2;
  required uint64 directoryCount = 3;
  required uint64 quota = 4;
  required uint64 spaceConsumed = 5;
  required uint64 spaceQuota = 6;
  optional StorageTypeQuotaInfosProto typeQuotaInfos = 7;
}

/**
 * Storage type quota and usage information of a file or directory
 */
message StorageTypeQuotaInfosProto {
  repeated StorageTypeQuotaInfoProto typeQuotaInfo = 1;
}

message StorageTypeQuotaInfoProto {
  required StorageTypeProto type = 1;
  required uint64 quota = 2;
  required uint64 consumed = 3;
}

/**
 * Contains a list of paths corresponding to corrupt files and a cookie
 * used for iterative calls to NameNode.listCorruptFileBlocks.
 *
 */
message CorruptFileBlocksProto {
 repeated string files = 1;
 required string   cookie = 2;
}

/**
 * File or Directory permision - same spec as posix
 */
message FsPermissionProto {
  required uint32 perm = 1;       // Actually a short - only 16bits used
}

/**
 * Types of recognized storage media.
 */
enum StorageTypeProto {
  DISK = 1;
  SSD = 2;
  ARCHIVE = 3;
  RAM_DISK = 4;
}

/**
 * A list of storage types. 
 */
message StorageTypesProto {
  repeated StorageTypeProto storageTypes = 1;
}

/**
 * Block replica storage policy.
 */
message BlockStoragePolicyProto {
  required uint32 policyId = 1;
  required string name = 2;
  // a list of storage types for storing the block replicas when creating a
  // block.
  required StorageTypesProto creationPolicy = 3;
  // A list of storage types for creation fallback storage.
  optional StorageTypesProto creationFallbackPolicy = 4;
  optional StorageTypesProto replicationFallbackPolicy = 5;
}


/**
 * A LocatedBlock gives information about a block and its location.
 */ 
message LocatedBlockProto {
  required ExtendedBlockProto b  = 1;
  required uint64 offset = 2;           // offset of first byte of block in the file
  repeated DatanodeInfoProto locs = 3;  // Locations ordered by proximity to client ip
  required bool corrupt = 4;            // true if all replicas of a block are corrupt, else false
                                        // If block has few corrupt replicas, they are filtered and 
                                        // their locations are not part of this object

  required hadoop.common.TokenProto blockToken = 5;
  repeated bool isCached = 6 [packed=true]; // if a location in locs is cached
  repeated StorageTypeProto storageTypes = 7;
  repeated string storageIDs = 8;

  // striped block related fields
  repeated uint32 blockIndex = 9; // used for striped block to indicate block index for each storage
  repeated hadoop.common.TokenProto blockTokens = 10; // each internal block has a block token
}

message DataEncryptionKeyProto {
  required uint32 keyId = 1;
  required string blockPoolId = 2;
  required bytes nonce = 3;
  required bytes encryptionKey = 4;
  required uint64 expiryDate = 5;
  optional string encryptionAlgorithm = 6;
}

/**
 * Cipher suite.
 */
enum CipherSuiteProto {
    UNKNOWN = 1;
    AES_CTR_NOPADDING = 2;
}

/**
 * Crypto protocol version used to access encrypted files.
 */
enum CryptoProtocolVersionProto {
    UNKNOWN_PROTOCOL_VERSION = 1;
    ENCRYPTION_ZONES = 2;
}

/**
 * Encryption information for a file.
 */
message FileEncryptionInfoProto {
  required CipherSuiteProto suite = 1;
  required CryptoProtocolVersionProto cryptoProtocolVersion = 2;
  required bytes key = 3;
  required bytes iv = 4;
  required string keyName = 5;
  required string ezKeyVersionName = 6;
}

/**
 * Encryption information for an individual
 * file within an encryption zone
 */
message PerFileEncryptionInfoProto {
  required bytes key = 1;
  required bytes iv = 2;
  required string ezKeyVersionName = 3;
}

/**
 * Encryption information for an encryption
 * zone
 */
message ZoneEncryptionInfoProto {
  required CipherSuiteProto suite = 1;
  required CryptoProtocolVersionProto cryptoProtocolVersion = 2;
  required string keyName = 3;
}

/**
 * Cipher option
 */
message CipherOptionProto {
  required CipherSuiteProto suite = 1;
  optional bytes inKey = 2;
  optional bytes inIv = 3;
  optional bytes outKey = 4;
  optional bytes outIv = 5;
}

/**
 * A set of file blocks and their locations.
 */
message LocatedBlocksProto {
  required uint64 fileLength = 1;
  repeated LocatedBlockProto blocks = 2;
  required bool underConstruction = 3;
  optional LocatedBlockProto lastBlock = 4;
  required bool isLastBlockComplete = 5;
  optional FileEncryptionInfoProto fileEncryptionInfo = 6;

  // Optional field for erasure coding
  optional ErasureCodingPolicyProto ecPolicy = 7;
}

/**
 * ECSchema options entry
 */
message ECSchemaOptionEntryProto {
  required string key = 1;
  required string value = 2;
}

/**
 * ECSchema for erasurecoding
 */
message ECSchemaProto {
  required string codecName = 1;
  required uint32 dataUnits = 2;
  required uint32 parityUnits = 3;
  repeated ECSchemaOptionEntryProto options = 4;
}

message ErasureCodingPolicyProto {
  required string name = 1;
  required ECSchemaProto schema = 2;
  required uint32 cellSize = 3;
}

/**
 * Status of a file, directory or symlink
 * Optionally includes a file's block locations if requested by client on the rpc call.
 */
message HdfsFileStatusProto {
  enum FileType {
    IS_DIR = 1;
    IS_FILE = 2;
    IS_SYMLINK = 3;
  }
  required FileType fileType = 1;
  required bytes path = 2;          // local name of inode encoded java UTF8
  required uint64 length = 3;
  required FsPermissionProto permission = 4;
  required string owner = 5;
  required string group = 6;
  required uint64 modification_time = 7;
  required uint64 access_time = 8;

  // Optional fields for symlink
  optional bytes symlink = 9;             // if symlink, target encoded java UTF8 

  // Optional fields for file
  optional uint32 block_replication = 10 [default = 0]; // only 16bits used
  optional uint64 blocksize = 11 [default = 0];
  optional LocatedBlocksProto locations = 12;  // suppled only if asked by client

  // Optional field for fileId
  optional uint64 fileId = 13 [default = 0]; // default as an invalid id
  optional int32 childrenNum = 14 [default = -1];
  // Optional field for file encryption
  optional FileEncryptionInfoProto fileEncryptionInfo = 15;

  optional uint32 storagePolicy = 16 [default = 0]; // block storage policy id

  // Optional field for erasure coding
  optional ErasureCodingPolicyProto ecPolicy = 17;
}

/**
 * Checksum algorithms/types used in HDFS
 * Make sure this enum's integer values match enum values' id properties defined
 * in org.apache.hadoop.util.DataChecksum.Type
 */
enum ChecksumTypeProto {
  CHECKSUM_NULL = 0;
  CHECKSUM_CRC32 = 1;
  CHECKSUM_CRC32C = 2;
}

/**
 * HDFS Server Defaults
 */
message FsServerDefaultsProto {
  required uint64 blockSize = 1;
  required uint32 bytesPerChecksum = 2;
  required uint32 writePacketSize = 3;
  required uint32 replication = 4; // Actually a short - only 16 bits used
  required uint32 fileBufferSize = 5;
  optional bool encryptDataTransfer = 6 [default = false];
  optional uint64 trashInterval = 7 [default = 0];
  optional ChecksumTypeProto checksumType = 8 [default = CHECKSUM_CRC32];
}


/**
 * Directory listing
 */
message DirectoryListingProto {
  repeated HdfsFileStatusProto partialListing = 1;
  required uint32 remainingEntries  = 2;
}

/**
 * Status of a snapshottable directory: besides the normal information for 
 * a directory status, also include snapshot quota, number of snapshots, and
 * the full path of the parent directory. 
 */
message SnapshottableDirectoryStatusProto {
  required HdfsFileStatusProto dirStatus = 1;

  // Fields specific for snapshottable directory
  required uint32 snapshot_quota = 2;
  required uint32 snapshot_number = 3;
  required bytes parent_fullpath = 4;
}

/**
 * Snapshottable directory listing
 */
message SnapshottableDirectoryListingProto {
  repeated SnapshottableDirectoryStatusProto snapshottableDirListing = 1;
}

/**
 * Snapshot diff report entry
 */
message SnapshotDiffReportEntryProto {
  required bytes fullpath = 1;
  required string modificationLabel = 2;
  optional bytes targetPath = 3;
}

/**
 * Snapshot diff report
 */
message SnapshotDiffReportProto {
  // full path of the directory where snapshots were taken
  required string snapshotRoot = 1;
  required string fromSnapshot = 2;
  required string toSnapshot = 3;
  repeated SnapshotDiffReportEntryProto diffReportEntries = 4;
}

/**
 * Block information
 *
 * Please be wary of adding additional fields here, since INodeFiles
 * need to fit in PB's default max message size of 64MB.
 * We restrict the max # of blocks per file
 * (dfs.namenode.fs-limits.max-blocks-per-file), but it's better
 * to avoid changing this.
 */
message BlockProto {
  required uint64 blockId = 1;
  required uint64 genStamp = 2;
  optional uint64 numBytes = 3 [default = 0];
}

/**
 * Information related to a snapshot
 * TODO: add more information
 */
message SnapshotInfoProto {
  required string snapshotName = 1;
  required string snapshotRoot = 2;
  required FsPermissionProto permission = 3;
  required string owner = 4;
  required string group = 5;
  required string createTime = 6;
  // TODO: do we need access time?
}

/**
 * Rolling upgrade status
 */
message RollingUpgradeStatusProto {
  required string blockPoolId = 1;
  optional bool finalized = 2 [default = false];
}


/**
 * A list of storage IDs.
 */
message StorageUuidsProto {
  repeated string storageUuids = 1;
}