frostfs-api/proto-docs/object.md
Leonard Lyubich 8e8d9f0982 [#26] object: Replace Epoch to ExtendedHeader
This commit replaces CreationEpoch field to ExtendedHeader message.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-08-06 21:59:42 +03:00

20 KiB

Protocol Documentation

Table of Contents

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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

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
CreationEpoch uint64 CreationEpoch carries number of NeoFS epoch on which the object was created.

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

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