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.PutHeader
  • PutResponse
  • Range
  • SearchRequest
  • SearchResponse

• object/types.proto

  • Messages
    • Attribute
    • ExtendedHeader
    • Header
    • IntegrityHeader
    • Object
    • SplitHeader
    • SystemHeader
    • Tombstone

• 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		Address of object (container id + object id)
OwnerID	bytes		OwnerID is a wallet address
Meta	service.RequestMetaHeader		RequestMetaHeader contains information about request meta headers (should be embedded into message)
Verify	service.RequestVerificationHeader		RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message)

Message DeleteResponse

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

Field	Type	Label	Description
Meta	service.ResponseMetaHeader		ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)

Message GetRangeHashRequest

Field	Type	Label	Description
Address	refs.Address		Address of object (container id + object id)
Ranges	Range	repeated	Ranges of object's payload to calculate homomorphic hash
Salt	bytes		Salt is used to XOR object's payload ranges before hashing, it can be nil
Meta	service.RequestMetaHeader		RequestMetaHeader contains information about request meta headers (should be embedded into message)
Verify	service.RequestVerificationHeader		RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message)

Message GetRangeHashResponse

Field	Type	Label	Description
Hashes	bytes	repeated	Hashes is a homomorphic hashes of all ranges
Meta	service.ResponseMetaHeader		ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)

Message GetRangeRequest

Field	Type	Label	Description
Address	refs.Address		Address of object (container id + object id)
Range	Range		Range of object's payload to return
Meta	service.RequestMetaHeader		RequestMetaHeader contains information about request meta headers (should be embedded into message)
Verify	service.RequestVerificationHeader		RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message)

Message GetRangeResponse

Field	Type	Label	Description
Fragment	bytes		Fragment of object's payload
Meta	service.ResponseMetaHeader		ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)

Message GetRequest

Field	Type	Label	Description
Address	refs.Address		Address of object (container id + object id)
Meta	service.RequestMetaHeader		RequestMetaHeader contains information about request meta headers (should be embedded into message)
Verify	service.RequestVerificationHeader		RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message)

Message GetResponse

Field	Type	Label	Description
object	Object		Object header and some payload
Chunk	bytes		Chunk of remaining payload
Meta	service.ResponseMetaHeader		ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)

Message HeadRequest

Field	Type	Label	Description
Address	refs.Address		Address of object (container id + object id)
FullHeaders	bool		FullHeaders can be set true for extended headers in the object
Meta	service.RequestMetaHeader		RequestMetaHeader contains information about request meta headers (should be embedded into message)
Verify	service.RequestVerificationHeader		RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message)

Message HeadResponse

Field	Type	Label	Description
Object	Object		Object without payload
Meta	service.ResponseMetaHeader		ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)

Message PutRequest

Field	Type	Label	Description
Header	PutRequest.PutHeader		Header should be the first message in the stream
Chunk	bytes		Chunk should be a remaining message in stream should be chunks
Meta	service.RequestMetaHeader		RequestMetaHeader contains information about request meta headers (should be embedded into message)
Verify	service.RequestVerificationHeader		RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message)

Message PutRequest.PutHeader

Field	Type	Label	Description
Object	Object		Object with at least container id and owner id fields
CopiesNumber	uint32		Number of the object copies to store within the RPC call (zero is processed according to the placement rules)

Message PutResponse

Field	Type	Label	Description
Address	refs.Address		Address of object (container id + object id)
Meta	service.ResponseMetaHeader		ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)

Message Range

Field	Type	Label	Description
Offset	uint64		Offset of the data range
Length	uint64		Length of the data range

Message SearchRequest

Field	Type	Label	Description
ContainerID	bytes		ContainerID for searching the object
Query	bytes		Query in the binary serialized format
QueryVersion	uint32		QueryVersion is a version of search query format
Meta	service.RequestMetaHeader		RequestMetaHeader contains information about request meta headers (should be embedded into message)
Verify	service.RequestVerificationHeader		RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message)

Message SearchResponse

Field	Type	Label	Description
Addresses	refs.Address	repeated	Addresses of found objects
Meta	service.ResponseMetaHeader		ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message)

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object/types.proto

Message 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 ExtendedHeader

Field	Type	Label	Description
Attributes	Attribute	repeated	Attributes carries list of the object attributes in a string key-value format.
SplitHeader	SplitHeader		Split carries the position of the object in the split hierarchy.
Tombstone	Tombstone		Tombstone header that set up in deleted objects
Token	service.Token		Token header contains token of the session within which the object was created
HomoHash	bytes		HomoHash is a homomorphic hash of original object payload
Integrity	IntegrityHeader		Integrity header with checksum of all above headers in the object
StorageGroup	storagegroup.StorageGroup		StorageGroup contains meta information for the data audit

Message Header

Header groups the information about the NeoFS object.

Field	Type	Label	Description
SystemHeader	SystemHeader		SystemHeader describes system header
ExtendedHeader	ExtendedHeader		ExtendedHeader carries the additional part of the header.

Message IntegrityHeader

Field	Type	Label	Description
PayloadChecksum	bytes		PayloadChecksum 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.
HeaderChecksum	bytes		HeaderChecksum 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. PayloadChecksum and HeaderChecksum 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 CreatorKey and ChecksumSignature.
CreatorKey	bytes		CreatorKey carries public key of the object creator in a binary format.
ChecksumSignature	bytes		ChecksumSignature is an user's signature of checksum to verify if it is correct

Message Object

Field	Type	Label	Description
Header	Header		Header carries the object header.
Payload	bytes		Payload is an object's payload

Message SplitHeader

SplitHeader 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		Previous 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 SystemHeader

Field	Type	Label	Description
PayloadLength	uint64		PayloadLength is an object payload length
Address	refs.Address		Address carries object address in the NeoFS system. It encapsulates the object and the container identifiers.
OwnerID	bytes		OwnerID is a wallet address
CreationEpoch	uint64		CreationEpoch carries number of NeoFS epoch on which the object was created.

Message Tombstone

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