syntax = "proto3";

package object;

option go_package = "github.com/nspcc-dev/neofs-api-go/object";
option csharp_namespace = "NeoFS.API.Object";

import "object/types.proto";
import "refs/types.proto";
import "service/meta.proto";
import "service/verify.proto";

// Object service provides API for manipulating with the object.
service Service {
  // Get the object from container. Response uses gRPC stream. First response
  // message carry object of requested address. Chunk messages are parts of
  // the object's payload if it is needed. All messages except first carry
  // chunks. Requested object can be restored by concatenation of object
  // message payload and all chunks keeping receiving order.
  rpc Get(GetRequest) returns (stream GetResponse);

  // Put the object into container. Request uses gRPC stream. First message
  // SHOULD BE type of PutHeader. Container id and Owner id of object SHOULD
  // BE set. Session token SHOULD BE obtained before put operation (see
  // session package). Chunk messages considered by server as part of object
  // payload. All messages except first SHOULD BE chunks. Chunk messages
  // SHOULD BE sent in direct order of fragmentation.
  rpc Put(stream PutRequest) returns (PutResponse);

  // Delete the object from a container
  rpc Delete(DeleteRequest) returns (DeleteResponse);

  // Head returns the object without data payload. Object in the
  // response has system header only. If full headers flag is set, extended
  // headers are also present.
  rpc Head(HeadRequest) returns (HeadResponse);

  // Search objects in container. Version of query language format SHOULD BE
  // set to 1. Search query represented in serialized format (see query
  // package).
  rpc Search(SearchRequest) returns (stream SearchResponse);

  // GetRange of data payload. Range is a pair (offset, length).
  // Requested range can be restored by concatenation of all chunks
  // keeping receiving order.
  rpc GetRange(GetRangeRequest) returns (stream GetRangeResponse);

  // GetRangeHash returns homomorphic hash of object payload range after XOR
  // operation. Ranges are set of pairs (offset, length). Hashes order in
  // response corresponds to ranges order in request. Homomorphic hash is
  // calculated for XORed data.
  rpc GetRangeHash(GetRangeHashRequest) returns (GetRangeHashResponse);
}

message GetRequest {
  message Body {
    // Carries the address of the requested object.
    refs.Address address = 1;

    // Carries the raw option flag of the request.
    // Raw request is sent to receive only the objects
    // that are physically stored on the server.
    bool raw = 2;
  }

  // Body of get object request message.
  Body body = 1;

  // Carries request meta information. Header data is used only to regulate message
  // transport and does not affect request execution.
  service.RequestMetaHeader meta_header = 2;

  // Carries request verification information. This header is used to authenticate
  // the nodes of the message route and check the correctness of transmission.
  service.RequestVerificationHeader verify_header = 3;
}

message GetResponse {
  message Body {
    // Carries the single message of the response stream.
    oneof ObjectPart {
      // Carries the object header.
      Header header = 1;

      // Carries part of the object payload.
      bytes chunk = 2;
    }
  }

  // Body of get object response message.
  Body body = 1;

  // Carries response meta information. Header data is used only to regulate
  // message transport and does not affect request execution.
  service.ResponseMetaHeader meta_header = 2;

  // Carries response verification information. This header is used to
  // authenticate the nodes of the message route and check the correctness
  // of transmission.
  service.ResponseVerificationHeader verify_header = 3;
}

message PutRequest {
  message Body {
    // Groups initialization parameters of object placement in NeoFS.
    message Init {
      // Carries the header of the object to save in the system.
      Header header = 1;

      // Carries the number of the object copies to store
      // within the RPC call. Default zero value is processed according
      // to the container placement rules.
      uint32 copies_number = 2;
    }

    // Carries the single part of the query stream.
    oneof Part {
      // Carries the initialization parameters of the object stream.
      Init init = 1;

      // Carries part of the object payload.
      bytes chunk = 2;
    }
  }

  // Body of put object request message.
  Body body = 1;

  // Carries request meta information. Header data is used only to regulate message
  // transport and does not affect request execution.
  service.RequestMetaHeader meta_header = 2;

  // Carries request verification information. This header is used to authenticate
  // the nodes of the message route and check the correctness of transmission.
  service.RequestVerificationHeader verify_header = 3;
}

message PutResponse {
  message Body {
    // Carries identifier of the saved object.
    // It is used to access an object in the container.
    refs.ObjectID object_id = 1;
  }

  // Body of put object response message.
  Body body = 1;

  // Carries response meta information. Header data is used only to regulate
  // message transport and does not affect request execution.
  service.ResponseMetaHeader meta_header = 2;

  // Carries response verification information. This header is used to
  // authenticate the nodes of the message route and check the correctness
  // of transmission.
  service.ResponseVerificationHeader verify_header = 3;
}

message DeleteRequest {
  message Body {
    // Carries the address of the object to be deleted.
    refs.Address address = 1;

    // Carries identifier the object owner.
    refs.OwnerID owner_id = 2;
  }

  // Body of delete object request message.
  Body body = 1;

  // Carries request meta information. Header data is used only to regulate message
  // transport and does not affect request execution.
  service.RequestMetaHeader meta_header = 2;

  // Carries request verification information. This header is used to authenticate
  // the nodes of the message route and check the correctness of transmission.
  service.RequestVerificationHeader verify_header = 3;
}

// DeleteResponse is empty because we cannot guarantee permanent object removal
// in distributed system.
message DeleteResponse {
  message Body { }

  // Body of delete object response message.
  Body body = 1;

  // Carries response meta information. Header data is used only to regulate
  // message transport and does not affect request execution.
  service.ResponseMetaHeader meta_header = 2;

  // Carries response verification information. This header is used to
  // authenticate the nodes of the message route and check the correctness
  // of transmission.
  service.ResponseVerificationHeader verify_header = 3;
}

message HeadRequest {
  message Body {
    // Carries the address of the object with the requested header.
    refs.Address address = 1;

    // Carries the option to crop header to main part.
    bool main_only = 2;

    // Carries the raw option flag of the request.
    // Raw request is sent to receive only the headers of the objects
    // that are physically stored on the server.
    bool raw = 3;
  }

  // Body of head object request message.
  Body body = 1;

  // Carries request meta information. Header data is used only to regulate message
  // transport and does not affect request execution.
  service.RequestMetaHeader meta_header = 2;

  // Carries request verification information. This header is used to authenticate
  // the nodes of the message route and check the correctness of transmission.
  service.RequestVerificationHeader verify_header = 3;
}

message HeadResponse {
  message Body {
    // Carries the requested object header.
    Header header = 1;
  }

  // Body of head object response message.
  Body body = 1;

  // Carries response meta information. Header data is used only to regulate
  // message transport and does not affect request execution.
  service.ResponseMetaHeader meta_header = 2;

  // Carries response verification information. This header is used to
  // authenticate the nodes of the message route and check the correctness
  // of transmission.
  service.ResponseVerificationHeader verify_header = 3;
}

message SearchRequest {
  message Body {
    // Carries search container identifier.
    refs.ContainerID container_id = 1;

    message Query {
      uint32 version = 1;

      message Filter {
        enum MatchType {
          MATCH_UNKNOWN = 0;
          STRING_EQUAL = 1;
        }

        MatchType match_type = 1;

        string name = 2;

        string value = 3;
      }

      repeated Filter filters = 2;
    }

    Query query = 2;
  }

  // Body of search object request message.
  Body body = 1;

  // Carries request meta information. Header data is used only to regulate message
  // transport and does not affect request execution.
  service.RequestMetaHeader meta_header = 2;

  // Carries request verification information. This header is used to authenticate
  // the nodes of the message route and check the correctness of transmission.
  service.RequestVerificationHeader verify_header = 3;
}

message SearchResponse {
  message Body {
    // Carries list of object identifiers that match the search query.
    repeated refs.ObjectID id_list = 1;
  }

  // Body of search object response message.
  Body body = 1;

  // Carries response meta information. Header data is used only to regulate
  // message transport and does not affect request execution.
  service.ResponseMetaHeader meta_header = 2;

  // Carries response verification information. This header is used to
  // authenticate the nodes of the message route and check the correctness
  // of transmission.
  service.ResponseVerificationHeader verify_header = 3;
}

// Range groups the parameters of object payload range.
message Range {
  // Carries the offset of the range from the object payload start.
  uint64 offset = 1;

  // Carries the length of the object payload range.
  uint64 length = 2;
}

message GetRangeRequest {
  message Body {
    // Address carries address of the object that contains the requested payload range.
    refs.Address address = 1;

    // Range carries the parameters of the requested payload range.
    Range range = 2;
  }

  // Body of get range object request message.
  Body body = 1;

  // Carries request meta information. Header data is used only to regulate message
  // transport and does not affect request execution.
  service.RequestMetaHeader meta_header = 2;

  // Carries request verification information. This header is used to authenticate
  // the nodes of the message route and check the correctness of transmission.
  service.RequestVerificationHeader verify_header = 3;
}

message GetRangeResponse {
  message Body {
    // Carries part of the object payload.
    bytes chunk = 1;
  }

  // Body of get range object response message.
  Body body = 1;

  // Carries response meta information. Header data is used only to regulate
  // message transport and does not affect request execution.
  service.ResponseMetaHeader meta_header = 2;

  // Carries response verification information. This header is used to
  // authenticate the nodes of the message route and check the correctness
  // of transmission.
  service.ResponseVerificationHeader verify_header = 3;
}

message GetRangeHashRequest {
  message Body {
    // Carries address of the object that contains the requested payload range.
    refs.Address address = 1;

    // Carries the list of object payload range to calculate homomorphic hash.
    repeated Range ranges = 2;

    // Carries binary salt to XOR object payload ranges before hash calculation.
    bytes salt = 3;
  }

  // Body of get range hash object request message.
  Body body = 1;

  // Carries request meta information. Header data is used only to regulate message
  // transport and does not affect request execution.
  service.RequestMetaHeader meta_header = 2;

  // Carries request verification information. This header is used to authenticate
  // the nodes of the message route and check the correctness of transmission.
  service.RequestVerificationHeader verify_header = 3;
}

message GetRangeHashResponse {
  message Body {
    // Carries list of homomorphic hashes in a binary format.
    repeated bytes hash_list = 1;
  }

  // Body of get range hash object response message.
  Body body = 1;

  // Carries response meta information. Header data is used only to regulate
  // message transport and does not affect request execution.
  service.ResponseMetaHeader meta_header = 2;

  // Carries response verification information. This header is used to
  // authenticate the nodes of the message route and check the correctness
  // of transmission.
  service.ResponseVerificationHeader verify_header = 3;
}