milvus/internal/proto/milvus.proto

syntax = "proto3";
package milvus.proto.milvus;

option go_package = "github.com/milvus-io/milvus/internal/proto/milvuspb";

option java_multiple_files = true;
option java_package = "io.milvus.grpc";
option java_outer_classname = "MilvusProto";
option java_generate_equals_and_hash = true;

import "common.proto";
import "schema.proto";

service MilvusService {
  rpc CreateCollection(CreateCollectionRequest) returns (common.Status) {}
  rpc DropCollection(DropCollectionRequest) returns (common.Status) {}
  rpc HasCollection(HasCollectionRequest) returns (BoolResponse) {}
  rpc LoadCollection(LoadCollectionRequest) returns (common.Status) {}
  rpc ReleaseCollection(ReleaseCollectionRequest) returns (common.Status) {}
  rpc DescribeCollection(DescribeCollectionRequest) returns (DescribeCollectionResponse) {}
  rpc GetCollectionStatistics(GetCollectionStatisticsRequest) returns (GetCollectionStatisticsResponse) {}
  rpc ShowCollections(ShowCollectionsRequest) returns (ShowCollectionsResponse) {}

  rpc CreatePartition(CreatePartitionRequest) returns (common.Status) {}
  rpc DropPartition(DropPartitionRequest) returns (common.Status) {}
  rpc HasPartition(HasPartitionRequest) returns (BoolResponse) {}
  rpc LoadPartitions(LoadPartitionsRequest) returns (common.Status) {}
  rpc ReleasePartitions(ReleasePartitionsRequest) returns (common.Status) {}
  rpc GetPartitionStatistics(GetPartitionStatisticsRequest) returns (GetPartitionStatisticsResponse) {}
  rpc ShowPartitions(ShowPartitionsRequest) returns (ShowPartitionsResponse) {}

  rpc CreateAlias(CreateAliasRequest) returns (common.Status) {}
  rpc DropAlias(DropAliasRequest) returns (common.Status) {}
  rpc AlterAlias(AlterAliasRequest) returns (common.Status) {}

  rpc CreateIndex(CreateIndexRequest) returns (common.Status) {}
  rpc DescribeIndex(DescribeIndexRequest) returns (DescribeIndexResponse) {}
  rpc GetIndexState(GetIndexStateRequest) returns (GetIndexStateResponse) {}
  rpc GetIndexBuildProgress(GetIndexBuildProgressRequest) returns (GetIndexBuildProgressResponse) {}
  rpc DropIndex(DropIndexRequest) returns (common.Status) {}

  rpc Insert(InsertRequest) returns (MutationResult) {}
  rpc Delete(DeleteRequest) returns (MutationResult) {}
  rpc Search(SearchRequest) returns (SearchResults) {}
  rpc Flush(FlushRequest) returns (FlushResponse) {}
  rpc Query(QueryRequest) returns (QueryResults) {}
  rpc CalcDistance(CalcDistanceRequest) returns (CalcDistanceResults) {}

  rpc GetFlushState(GetFlushStateRequest) returns (GetFlushStateResponse) {}
  rpc GetPersistentSegmentInfo(GetPersistentSegmentInfoRequest) returns (GetPersistentSegmentInfoResponse) {}
  rpc GetQuerySegmentInfo(GetQuerySegmentInfoRequest) returns (GetQuerySegmentInfoResponse) {}
  rpc GetReplicas(GetReplicasRequest) returns (GetReplicasResponse) {}

  rpc Dummy(DummyRequest) returns (DummyResponse) {}

  // TODO: remove
  rpc RegisterLink(RegisterLinkRequest) returns (RegisterLinkResponse) {}

  // https://wiki.lfaidata.foundation/display/MIL/MEP+8+--+Add+metrics+for+proxy
  rpc GetMetrics(GetMetricsRequest) returns (GetMetricsResponse) {}
  rpc LoadBalance(LoadBalanceRequest) returns (common.Status) {}
  rpc GetCompactionState(GetCompactionStateRequest) returns (GetCompactionStateResponse) {}
  rpc ManualCompaction(ManualCompactionRequest) returns (ManualCompactionResponse) {}
  rpc GetCompactionStateWithPlans(GetCompactionPlansRequest) returns (GetCompactionPlansResponse) {}

  // https://wiki.lfaidata.foundation/display/MIL/MEP+24+--+Support+bulk+load
  rpc Import(ImportRequest) returns (ImportResponse) {}
  rpc GetImportState(GetImportStateRequest) returns (GetImportStateResponse) {}

  // https://wiki.lfaidata.foundation/display/MIL/MEP+27+--+Support+Basic+Authentication
  rpc CreateCredential(CreateCredentialRequest) returns (common.Status) {}
  rpc UpdateCredential(UpdateCredentialRequest) returns (common.Status) {}
  rpc DeleteCredential(DeleteCredentialRequest) returns (common.Status) {}
  rpc ListCredUsers(ListCredUsersRequest) returns (ListCredUsersResponse) {}
}

message CreateAliasRequest {
  common.MsgBase base = 1;
  string db_name = 2;
  string collection_name = 3;
  string alias = 4;
}

message DropAliasRequest {
  common.MsgBase base = 1;
  string db_name = 2;
  string alias = 3;
}

message AlterAliasRequest{
  common.MsgBase base = 1;
  string db_name = 2;
  string collection_name = 3;
  string alias = 4;
}

/**
* Create collection in milvus
*/
message CreateCollectionRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The unique collection name in milvus.(Required)
  string collection_name = 3; 
  // The serialized `schema.CollectionSchema`(Required)
  bytes schema = 4; 
  // Once set, no modification is allowed (Optional)
  // https://github.com/milvus-io/milvus/issues/6690
  int32 shards_num = 5;
  // The consistency level that the collection used, modification is not supported now.
  common.ConsistencyLevel consistency_level = 6;
}

/**
* Drop collection in milvus, also will drop data in collection. 
*/
message DropCollectionRequest {
  // Not useful for now
  common.MsgBase base = 1; 
  // Not useful for now
  string db_name = 2;
  // The unique collection name in milvus.(Required)
  string collection_name = 3;
}

/**
* Check collection exist in milvus or not.
*/
message HasCollectionRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The collection name you want to check.
  string collection_name = 3; 
  // If time_stamp is not zero, will return true when time_stamp >= created collection timestamp, otherwise will return false.
  uint64 time_stamp = 4;
}


message BoolResponse {
  common.Status status = 1;
  bool value = 2;
}

message StringResponse {
  common.Status status = 1;
  string value = 2;
}

/**
* Get collection meta datas like: schema, collectionID, shards number ...
*/
message DescribeCollectionRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The collection name you want to describe, you can pass collection_name or collectionID
  string collection_name = 3;
  // The collection ID you want to describe
  int64 collectionID = 4;
  // If time_stamp is not zero, will describe collection success when time_stamp >= created collection timestamp, otherwise will throw error.
  uint64 time_stamp = 5;
}

/**
* DescribeCollection Response
*/
message DescribeCollectionResponse {
  // Contain error_code and reason
  common.Status status = 1;
  // The schema param when you created collection.
  schema.CollectionSchema schema = 2;
  // The collection id
  int64 collectionID = 3;
  // System design related, users should not perceive
  repeated string virtual_channel_names = 4;
  // System design related, users should not perceive
  repeated string physical_channel_names = 5;
  // Hybrid timestamp in milvus
  uint64 created_timestamp = 6;
  // The utc timestamp calculated by created_timestamp
  uint64 created_utc_timestamp = 7;
  // The shards number you set.
  int32 shards_num = 8;
  // The aliases of this collection
  repeated string aliases = 9;
  // The message ID/posititon when collection is created
  repeated common.KeyDataPair start_positions = 10;
  // The consistency level that the collection used, modification is not supported now.
  common.ConsistencyLevel consistency_level = 11;
  // The collection name
  string collection_name = 12;
}

/**
* Load collection data into query nodes, then you can do vector search on this collection.
*/
message LoadCollectionRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The collection name you want to load
  string collection_name = 3;
  // The replica number to load, default by 1
  int32 replica_number = 4;
}

/**
* Release collection data from query nodes, then you can't do vector search on this collection.
*/
message ReleaseCollectionRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The collection name you want to release
  string collection_name = 3;
}

/**
* Get collection statistics like row_count.
*/
message GetCollectionStatisticsRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The collection name you want get statistics
  string collection_name = 3;
}

/**
* Will return collection statistics in stats field like [{key:"row_count",value:"1"}]
*/
message GetCollectionStatisticsResponse {
  // Contain error_code and reason
  common.Status status = 1;
  // Collection statistics data
  repeated common.KeyValuePair stats = 2;
}

/*
* This is for ShowCollectionsRequest type field.
*/
enum ShowType {
  // Will return all colloections 
  All = 0;
  // Will return loaded collections with their inMemory_percentages
  InMemory = 1;
}

/*
* List collections 
*/
message ShowCollectionsRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // Not useful for now
  uint64 time_stamp = 3;
  // Decide return Loaded collections or All collections(Optional)
  ShowType type = 4;
  // When type is InMemory, will return these collection's inMemory_percentages.(Optional)
  repeated string collection_names = 5; 
}

/*
* Return basic collection infos.
*/
message ShowCollectionsResponse {
  // Contain error_code and reason
  common.Status status = 1;
  // Collection name array
  repeated string collection_names = 2;
  // Collection Id array
  repeated int64 collection_ids = 3;
  // Hybrid timestamps in milvus
  repeated uint64 created_timestamps = 4;
  // The utc timestamp calculated by created_timestamp
  repeated uint64 created_utc_timestamps = 5;
  // Load percentage on querynode when type is InMemory
  repeated int64 inMemory_percentages = 6; 
}

/*
* Create partition in created collection.
*/
message CreatePartitionRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The collection name in milvus
  string collection_name = 3;
  // The partition name you want to create.
  string partition_name = 4;
}

/*
* Drop partition in created collection.
*/
message DropPartitionRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The collection name in milvus
  string collection_name = 3;
  // The partition name you want to drop
  string partition_name = 4; 
}

/*
* Check if partition exist in collection or not.
*/
message HasPartitionRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The collection name in milvus
  string collection_name = 3;
  // The partition name you want to check
  string partition_name = 4;
}

/*
* Load specific partitions data of one collection into query nodes
* Then you can get these data as result when you do vector search on this collection.
*/
message LoadPartitionsRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The collection name in milvus
  string collection_name = 3;
  // The partition names you want to load
  repeated string partition_names = 4;
  // The replicas number you would load, 1 by default
  int32 replica_number = 5;
}

/*
* Release specific partitions data of one collection from query nodes.
* Then you can not get these data as result when you do vector search on this collection.
*/
message ReleasePartitionsRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The collection name in milvus
  string collection_name = 3;
  // The partition names you want to release
  repeated string partition_names = 4;
}

/*
* Get partition statistics like row_count.
*/
message GetPartitionStatisticsRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The collection name in milvus
  string collection_name = 3;
  // The partition name you want to collect statistics
  string partition_name = 4; 
}

message GetPartitionStatisticsResponse {
  common.Status status = 1;
  repeated common.KeyValuePair stats = 2;
}

/*
* List all partitions for particular collection
*/
message ShowPartitionsRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The collection name you want to describe, you can pass collection_name or collectionID
  string collection_name = 3;
  // The collection id in milvus
  int64 collectionID = 4;
  // When type is InMemory, will return these patitions's inMemory_percentages.(Optional)
  repeated string partition_names = 5;
  // Decide return Loaded partitions or All partitions(Optional)
  ShowType type = 6;
}

/*
* List all partitions for particular collection response.
* The returned datas are all rows, we can format to columns by therir index.
*/
message ShowPartitionsResponse {
  // Contain error_code and reason
  common.Status status = 1;
  // All partition names for this collection
  repeated string partition_names = 2;
  // All partition ids for this collection
  repeated int64 partitionIDs = 3;
  // All hybrid timestamps
  repeated uint64 created_timestamps = 4;
  // All utc timestamps calculated by created_timestamps
  repeated uint64 created_utc_timestamps = 5;
  // Load percentage on querynode
  repeated int64 inMemory_percentages = 6;
}

message DescribeSegmentRequest {
  common.MsgBase base = 1;
  int64 collectionID = 2;
  int64 segmentID = 3;
}

message DescribeSegmentResponse {
  common.Status status = 1;
  int64 indexID = 2;
  int64 buildID = 3;
  bool enable_index = 4;
  int64 fieldID = 5;
}

message ShowSegmentsRequest {
  common.MsgBase base = 1;
  int64 collectionID = 2;
  int64 partitionID = 3;
}

message ShowSegmentsResponse {
  common.Status status = 1;
  repeated int64 segmentIDs = 2;
}

/*
* Create index for vector datas
*/
message CreateIndexRequest {
  // Not useful for now
  common.MsgBase base = 1; 
  // Not useful for now
  string db_name = 2;
  // The particular collection name you want to create index.
  string collection_name = 3;
  // The vector field name in this particular collection
  string field_name = 4;
  // Support keys: index_type,metric_type, params. Different index_type may has different params.
  repeated common.KeyValuePair extra_params = 5;
  // Version before 2.0.2 doesn't contain index_name, we use default index name.
  string index_name = 6;
}

/*
* Get created index information. 
* Current release of Milvus only supports showing latest built index.
*/
message DescribeIndexRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2;
  // The particular collection name in Milvus
  string collection_name = 3;
   // The vector field name in this particular collection
  string field_name = 4;
  // No need to set up for now @2021.06.30
  string index_name = 5; 
}

/*
* Index informations
*/
message IndexDescription {
  // Index name
  string index_name = 1;
  // Index id
  int64 indexID = 2;
  // Will return index_type, metric_type, params(like nlist).
  repeated common.KeyValuePair params = 3;
  // The vector field name
  string field_name = 4;
}

/*
* Describe index response
*/
message DescribeIndexResponse {
  // Response status
  common.Status status = 1;
  // All index informations, for now only return tha latest index you created for the collection.
  repeated IndexDescription index_descriptions = 2;
}

/*
*  Get index building progress 
*/
message GetIndexBuildProgressRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string db_name = 2 ;
  // The collection name in milvus
  string collection_name = 3;
  // The vector field name in this collection
  string field_name = 4;
  // Not useful for now
  string index_name = 5;
}

message GetIndexBuildProgressResponse {
  common.Status status = 1;
  int64 indexed_rows = 2;
  int64 total_rows = 3;
}

message GetIndexStateRequest {
  common.MsgBase base = 1; // must
  string db_name = 2 ;
  string collection_name = 3; // must
  string field_name = 4;
  string index_name = 5; // No need to set up for now @2021.06.30
}

message GetIndexStateResponse {
  common.Status status = 1;
  common.IndexState state = 2;
  string fail_reason = 3;
}

message DropIndexRequest {
  common.MsgBase base = 1; // must
  string db_name = 2;
  string collection_name = 3; // must
  string field_name = 4;
  string index_name = 5; // No need to set up for now @2021.06.30
}

message InsertRequest {
  common.MsgBase base = 1;
  string db_name = 2;
  string collection_name = 3;
  string partition_name = 4;
  repeated schema.FieldData fields_data = 5;
  repeated uint32 hash_keys = 6;
  uint32 num_rows = 7;
}

message MutationResult {
  common.Status status = 1;
  schema.IDs IDs = 2; // required for insert, delete
  repeated uint32 succ_index = 3; // error indexes indicate
  repeated uint32 err_index = 4; // error indexes indicate
  bool acknowledged = 5;
  int64 insert_cnt = 6;
  int64 delete_cnt = 7;
  int64 upsert_cnt = 8;
  uint64 timestamp = 9;
}

message DeleteRequest {
  common.MsgBase base = 1;
  string db_name = 2;
  string collection_name = 3;
  string partition_name = 4;
  string expr = 5;
  repeated uint32 hash_keys = 6;
}

enum PlaceholderType {
  None = 0;
  BinaryVector = 100;
  FloatVector = 101;
}

message PlaceholderValue {
  string tag = 1;
  PlaceholderType type = 2;
  // values is a 2d-array, every array contains a vector
  repeated bytes values = 3;
}

message PlaceholderGroup {
  repeated PlaceholderValue placeholders = 1;
}

message SearchRequest {
  common.MsgBase base = 1; // must
  string db_name = 2;
  string collection_name = 3; // must
  repeated string partition_names = 4; // must
  string dsl = 5; // must
  // serialized `PlaceholderGroup`
  bytes placeholder_group = 6; // must
  common.DslType dsl_type = 7; // must
  repeated string output_fields = 8;
  repeated common.KeyValuePair search_params = 9; // must
  uint64 travel_timestamp = 10;
  uint64 guarantee_timestamp = 11; // guarantee_timestamp
}

message Hits {
  repeated int64 IDs = 1;
  repeated bytes row_data = 2;
  repeated float scores = 3;
}

message SearchResults {
  common.Status status = 1;
  schema.SearchResultData results = 2;
  string collection_name = 3;
}

message FlushRequest {
  common.MsgBase base = 1;
  string db_name = 2;
  repeated string collection_names = 3;
}

message FlushResponse{
  common.Status status = 1;
  string db_name = 2;
  map<string, schema.LongArray> coll_segIDs = 3;
}

message QueryRequest {
  common.MsgBase base = 1;
  string db_name = 2;
  string collection_name = 3;
  string expr = 4;
  repeated string output_fields = 5;
  repeated string partition_names = 6;
  uint64 travel_timestamp = 7;
  uint64 guarantee_timestamp = 8; // guarantee_timestamp
}

message QueryResults {
  common.Status status = 1;
  repeated schema.FieldData fields_data = 2;
  string collection_name = 3;
}

message VectorIDs {
  string collection_name = 1;
  string field_name = 2;
  schema.IDs id_array = 3;
  repeated string partition_names = 4;
}

message VectorsArray {
  oneof array {
    VectorIDs id_array = 1; // vector ids
    schema.VectorField data_array = 2; // vectors data
  } 
}

message CalcDistanceRequest {
  common.MsgBase base = 1;
  VectorsArray op_left = 2; // vectors on the left of operator
  VectorsArray op_right = 3; // vectors on the right of operator
  repeated common.KeyValuePair params = 4; // "metric":"L2"/"IP"/"HAMMIN"/"TANIMOTO"
}

message CalcDistanceResults {
  common.Status status = 1;
  // num(op_left)*num(op_right) distance values, "HAMMIN" return integer distance
  oneof array {
    	schema.IntArray int_dist = 2;
	schema.FloatArray float_dist = 3;
  }
}

message PersistentSegmentInfo {
  int64 segmentID = 1;
  int64 collectionID = 2;
  int64 partitionID = 3;
  int64 num_rows = 4;
  common.SegmentState state = 5;
}

message GetPersistentSegmentInfoRequest {
  common.MsgBase base = 1; // must
  string dbName = 2;
  string collectionName = 3; // must
}

message GetPersistentSegmentInfoResponse {
  common.Status status = 1;
  repeated PersistentSegmentInfo infos = 2;
}

message QuerySegmentInfo {
  int64 segmentID = 1;
  int64 collectionID = 2;
  int64 partitionID = 3;
  int64 mem_size = 4;
  int64 num_rows = 5;
  string index_name = 6;
  int64 indexID = 7;
  int64 nodeID = 8;
  common.SegmentState state = 9;
}

message GetQuerySegmentInfoRequest {
  common.MsgBase base = 1; // must
  string dbName = 2;
  string collectionName = 3; // must
}

message GetQuerySegmentInfoResponse {
  common.Status status = 1;
  repeated QuerySegmentInfo infos = 2;
}

message DummyRequest {
  string request_type = 1;
}

message DummyResponse {
  string response = 1;
}

message RegisterLinkRequest {
}

message RegisterLinkResponse {
  common.Address address = 1;
  common.Status status = 2;
}

message GetMetricsRequest {
  common.MsgBase base = 1;
  string request = 2; // request is of jsonic format
}

message GetMetricsResponse {
  common.Status status = 1;
  string response = 2;  // response is of jsonic format
  string component_name = 3; // metrics from which component
}

/*
* Do load balancing operation from src_nodeID to dst_nodeID.
*/
message LoadBalanceRequest {
  common.MsgBase base = 1;
  int64 src_nodeID = 2;
  repeated int64 dst_nodeIDs = 3;
  repeated int64 sealed_segmentIDs = 4;
  string collectionName = 5;
}

message ManualCompactionRequest {
  int64 collectionID = 1;
  uint64 timetravel = 2;
}

message ManualCompactionResponse {
  common.Status status = 1;
  int64 compactionID = 2;
}

message GetCompactionStateRequest {
  int64 compactionID = 1;
}

message GetCompactionStateResponse {
  common.Status status = 1;
  common.CompactionState state = 2;
  int64 executingPlanNo = 3;
  int64 timeoutPlanNo = 4;
  int64 completedPlanNo = 5;
}

message GetCompactionPlansRequest {
  int64 compactionID = 1;
}

message GetCompactionPlansResponse {
  common.Status status = 1;
  common.CompactionState state = 2;
  repeated CompactionMergeInfo mergeInfos = 3;
}

message CompactionMergeInfo {
  repeated int64 sources = 1;
  int64 target = 2;
}

message GetFlushStateRequest {
  repeated int64 segmentIDs = 1;
}

message GetFlushStateResponse {
  common.Status status = 1;
  bool flushed = 2;
}

message ImportRequest {
  string collection_name = 1;                // target collection
  string partition_name = 2;                 // target partition
  repeated string channel_names = 3;         // channel names for the collection
  bool row_based = 4;                        // the file is row-based or column-based
  repeated string files = 5;                 // file paths to be imported
  repeated common.KeyValuePair options = 6;  // import options, bucket, etc.
}
 
message ImportResponse {
  common.Status status = 1;
  repeated int64 tasks = 2;  // id array of import tasks
}
 
message GetImportStateRequest {
  int64 task = 1;  // id of an import task
}
 
message GetImportStateResponse {
  common.Status status = 1;
  common.ImportState state = 2;            // is this import task finished or not
  int64 row_count = 3;                     // if the task is finished, this value is how many rows are imported. if the task is not finished, this value is how many rows are parsed. return 0 if failed.
  repeated int64 id_list = 4;              // auto generated ids if the primary key is autoid
  repeated common.KeyValuePair infos = 5;  // more informations about the task, progress percent, file path, failed reason, etc.
}

message GetReplicasRequest {
  common.MsgBase base = 1;
  int64 collectionID = 2;
  bool with_shard_nodes = 3;
}

message GetReplicasResponse {
  common.Status status = 1;
  repeated ReplicaInfo replicas = 2;
}

message ReplicaInfo {    // ReplicaGroup
  int64 replicaID = 1;
  int64 collectionID = 2;
  repeated int64 partition_ids = 3;    // empty indicates to load collection
  repeated ShardReplica shard_replicas = 4;
  repeated int64 node_ids = 5; // include leaders
}

message ShardReplica {
    int64 leaderID = 1;
    string leader_addr = 2; // IP:port
    string dm_channel_name = 3;
    // optional, DO NOT save it in meta, set it only for GetReplicas()
    // if with_shard_nodes is true
    repeated int64 node_ids = 4;
}

service ProxyService {
  rpc RegisterLink(RegisterLinkRequest) returns (RegisterLinkResponse) {}
}

// https://wiki.lfaidata.foundation/display/MIL/MEP+27+--+Support+Basic+Authentication

message CreateCredentialRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // username
  string username = 2;
  // ciphertext password
  string password = 3;
  // create time
  uint64 created_utc_timestamps = 4;
  // modify time
  uint64 modified_utc_timestamps = 5;
}

message UpdateCredentialRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // username
  string username = 2;
  // old password
  string oldPassword = 3;
  // new password
  string newPassword = 4;
  // create time
  uint64 created_utc_timestamps = 5;
  // modify time
  uint64 modified_utc_timestamps = 6;
}

message DeleteCredentialRequest {
  // Not useful for now
  common.MsgBase base = 1;
  // Not useful for now
  string username = 2;
}

message ListCredUsersResponse {
  // Contain error_code and reason
  common.Status status = 1;
  // username array
  repeated string usernames = 2;
}

message ListCredUsersRequest {
  // Not useful for now
  common.MsgBase base = 1;
}