frostfs-api/proto-docs/object.md

Protocol Documentation

Table of Contents

• object/service.proto

• Services

  • Service

• Messages

  • DeleteRequest
  • DeleteResponse
  • GetRangeHashRequest
  • GetRangeHashResponse
  • GetRangeRequest
  • GetRangeResponse
  • GetRequest
  • GetResponse
  • HeadRequest
  • HeadResponse
  • PutRequest
  • PutRequest.Init
  • PutResponse
  • Range
  • SearchRequest
  • SearchRequest.Query
  • SearchRequest.Query.Filter
  • SearchResponse

• object/types.proto

  • Messages
    • Header
    • Header.Extended
    • Header.Extended.Attribute
    • Header.Extended.Integrity
    • Header.Extended.Split
    • Header.Extended.StorageGroup
    • Header.Extended.Tombstone
    • Header.Main
    • Object

• Scalar Value Types

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object/service.proto

Service "object.Service"

Object service provides API for manipulating with the object.

rpc Get(GetRequest) returns (stream GetResponse);
rpc Put(stream PutRequest) returns (PutResponse);
rpc Delete(DeleteRequest) returns (DeleteResponse);
rpc Head(HeadRequest) returns (HeadResponse);
rpc Search(SearchRequest) returns (stream SearchResponse);
rpc GetRange(GetRangeRequest) returns (stream GetRangeResponse);
rpc GetRangeHash(GetRangeHashRequest) returns (GetRangeHashResponse);

Method Get

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.

Name	Input	Output
Get	GetRequest	GetResponse

Method Put

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.

Name	Input	Output
Put	PutRequest	PutResponse

Method Delete

Delete the object from a container

Name	Input	Output
Delete	DeleteRequest	DeleteResponse

Method Head

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.

Name	Input	Output
Head	HeadRequest	HeadResponse

Method Search

Search objects in container. Version of query language format SHOULD BE set to 1. Search query represented in serialized format (see query package).

Name	Input	Output
Search	SearchRequest	SearchResponse

Method GetRange

GetRange of data payload. Range is a pair (offset, length). Requested range can be restored by concatenation of all chunks keeping receiving order.

Name	Input	Output
GetRange	GetRangeRequest	GetRangeResponse

Method GetRangeHash

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.

Name	Input	Output
GetRangeHash	GetRangeHashRequest	GetRangeHashResponse

Message DeleteRequest

Field	Type	Label	Description
address	refs.Address		Carries the address of the object to be deleted.
owner_id	refs.OwnerID		Carries identifier the object owner.
meta_header	service.RequestMetaHeader		Carries request meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	service.RequestVerificationHeader		Carries request verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message DeleteResponse

DeleteResponse is empty because we cannot guarantee permanent object removal in distributed system.

Message GetRangeHashRequest

Field	Type	Label	Description
address	refs.Address		Carries address of the object that contains the requested payload range.
ranges	Range	repeated	Carries the list of object payload range to calculate homomorphic hash.
salt	bytes		Carries binary salt to XOR object payload ranges before hash calculation.
meta_header	service.RequestMetaHeader		Carries request meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	service.RequestVerificationHeader		Carries request verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message GetRangeHashResponse

Field	Type	Label	Description
hash_list	bytes	repeated	Carries list of homomorphic hashes in a binary format.

Message GetRangeRequest

Field	Type	Label	Description
address	refs.Address		Address carries address of the object that contains the requested payload range.
range	Range		Range carries the parameters of the requested payload range.
meta_header	service.RequestMetaHeader		Carries request meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	service.RequestVerificationHeader		Carries request verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message GetRangeResponse

Field	Type	Label	Description
chunk	bytes		Carries part of the object payload.

Message GetRequest

Field	Type	Label	Description
address	refs.Address		Carries the address of the requested object.
raw	bool		Carries the raw option flag of the request. Raw request is sent to receive only the objects that are physically stored on the server.
meta_header	service.RequestMetaHeader		Carries request meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	service.RequestVerificationHeader		Carries request verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message GetResponse

Field	Type	Label	Description
header	Header		Carries the object header.
chunk	bytes		Carries part of the object payload.

Message HeadRequest

Field	Type	Label	Description
address	refs.Address		Carries the address of the object with the requested header.
main_only	bool		Carries the option to crop header to main part.
raw	bool		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.
meta_header	service.RequestMetaHeader		Carries request meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	service.RequestVerificationHeader		Carries request verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message HeadResponse

Field	Type	Label	Description
header	Header		Carries the requested object header.

Message PutRequest

Field	Type	Label	Description
init	PutRequest.Init		Carries the initialization parameters of the object stream.
chunk	bytes		Carries part of the object payload.
meta_header	service.RequestMetaHeader		Carries request meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	service.RequestVerificationHeader		Carries request verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message PutRequest.Init

Groups initialization parameters of object placement in NeoFS.

Field	Type	Label	Description
header	Header		Carries the header of the object to save in the system.
copies_number	uint32		Carries the number of the object copies to store within the RPC call. Default zero value is processed according to the container placement rules.

Message PutResponse

Field	Type	Label	Description
object_id	refs.ObjectID		Carries identifier of the saved object. It is used to access an object in the container.

Message Range

Range groups the parameters of object payload range.

Field	Type	Label	Description
offset	uint64		Carries the offset of the range from the object payload start.
length	uint64		Carries the length of the object payload range.

Message SearchRequest

Field	Type	Label	Description
container_id	refs.ContainerID		Carries search container identifier.
query	SearchRequest.Query
meta_header	service.RequestMetaHeader		Carries request meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	service.RequestVerificationHeader		Carries request verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message SearchRequest.Query

Field	Type	Label	Description
version	uint32
filters	SearchRequest.Query.Filter	repeated

Message SearchRequest.Query.Filter

Field	Type	Label	Description
match_type	SearchRequest.Query.Filter.MatchType
name	string
value	string

Message SearchResponse

Field	Type	Label	Description
id_list	refs.ObjectID	repeated	Carries list of object identifiers that match the search query.

SearchRequest.Query.Filter.MatchType

Name	Number	Description
MATCH_UNKNOWN	0
STRING_EQUAL	1

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object/types.proto

Message Header

Header groups the information about the NeoFS object.

Field	Type	Label	Description
main	Header.Main		Main carries the main part of the header. Main MUST NOT be NULL.
extended	Header.Extended		Extended carries the additional part of the header.

Message Header.Extended

Extended groups additional information about the object. It encapsulates both user and system attributes needed to regulate the NeoFS sub-systems.

Field	Type	Label	Description
integrity	Header.Extended.Integrity		integrity carries object integrity evidence.
attributes	Header.Extended.Attribute	repeated	attributes carries list of the object attributes in a string key-value format.
creation_epoch	uint64		creation_epoch carries number of NeoFS epoch on which the object was created.
tombstone	Header.Extended.Tombstone		Tombstone marks the object to be deleted.
homomorphic_hash	bytes		homomorphic_hash carries homomorphic hash of the object payload.
storage_group	Header.Extended.StorageGroup		StorageGroup marks an object containing information about a storage group.
split	Header.Extended.Split		Split carries the position of the object in the split hierarchy.

Message Header.Extended.Attribute

Attribute groups the parameters of the object attributes.

Field	Type	Label	Description
key	string		key carries the string key to the object attribute.
value	string		value carries the string value of the object attribute.

Message Header.Extended.Integrity

Integrity groups evidence of the integrity of an object's structure.

Field	Type	Label	Description
payload_checksum	bytes		payload_checksum carries the checksum of object payload bytes. Changing any byte of the payload changes the checksum. It is calculated as a SHA-256 hash over payload bytes.
header_checksum	bytes		header_checksum carries checksum of the object header structure. It covers all object attributes. Changing any field of the object except CreatorKey and ChecksumSignature changes the checksum. payload_checksum and header_checksum cannot be merged due to the need to verify the header in the absence of a payload (e.g. in object.Head rpc). It is calculated as a SHA-256 hash over marshaled object header with cut creator_key and checksum_signature.
session_token	service.SessionToken		session_token carries token of the session within which the object was created. If session token is presented in object, it acts as the user's proof of the correctness of the creator_key.
creator_key	bytes		creator_key carries public key of the object creator in a binary format.
checksum_signature	bytes		checksum_signature carries signature of the structure checksum by the object creator.

Message Header.Extended.Split

Split groups information about spawning the object through a payload splitting.

Field	Type	Label	Description
parent	refs.ObjectID		Parent carries identifier of the origin object.
previous	refs.ObjectID		Previous carries identifier of the left split neighbor.
next	refs.ObjectID		Next carries identifier of the right split neighbor.
children	refs.ObjectID	repeated	Children carries list of identifiers of the objects generated by splitting the current.
origin	Header		Origin carries the header of the origin object.

Message Header.Extended.StorageGroup

StorageGroup groups meta information about a storage group.

Message Header.Extended.Tombstone

Tombstone groups the options for deleting an object.

Message Header.Main

Main groups mandatory information about the object. Message fields are presented in all NeoFS objects.

Field	Type	Label	Description
payload_length	uint64		payload_length carries length of the object payload. Each object has a fixed payload length since it's immutable.
address	refs.Address		address carries object address in the NeoFS system. It encapsulates the object and the container identifiers.
owner_id	refs.OwnerID		owner_id carries identifier of the object owner.

Message Object

Object groups the information about the NeoFS object. It consists of payload data with additional service information.

Field	Type	Label	Description
header	Header		Header carries the object header.
payload	bytes		Payload carries the object payload bytes.

Scalar Value Types

.proto Type	Notes	C++ Type	Java Type	Python Type
double		double	double	float
float		float	float	float
int32	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead.	int32	int	int
int64	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead.	int64	long	int/long
uint32	Uses variable-length encoding.	uint32	int	int/long
uint64	Uses variable-length encoding.	uint64	long	int/long
sint32	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s.	int32	int	int
sint64	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s.	int64	long	int/long
fixed32	Always four bytes. More efficient than uint32 if values are often greater than 2^28.	uint32	int	int
fixed64	Always eight bytes. More efficient than uint64 if values are often greater than 2^56.	uint64	long	int/long
sfixed32	Always four bytes.	int32	int	int
sfixed64	Always eight bytes.	int64	long	int/long
bool		bool	boolean	boolean
string	A string must always contain UTF-8 encoded or 7-bit ASCII text.	string	String	str/unicode
bytes	May contain any arbitrary sequence of bytes.	string	ByteString	str