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frostfs-api/proto-docs/object.md
Leonard Lyubich 2c3717bdee [#26] object: Rename Header to ExtendedHeader 
The naming Header obscures its semantic meaning precisely as a subclass of
the general object header. To clarify the layers of typing object headers,
this commit renames the message to ExtendedHeader. As a result, the Headers
field in the Object has been renamed to ExtendedHeaders.

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

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# Protocol Documentation
<a name="top"></a>
## Table of Contents
- [object/service.proto](#object/service.proto)
- Services
- [Service](#object.Service)
- Messages
- [DeleteRequest](#object.DeleteRequest)
- [DeleteResponse](#object.DeleteResponse)
- [GetRangeHashRequest](#object.GetRangeHashRequest)
- [GetRangeHashResponse](#object.GetRangeHashResponse)
- [GetRangeRequest](#object.GetRangeRequest)
- [GetRangeResponse](#object.GetRangeResponse)
- [GetRequest](#object.GetRequest)
- [GetResponse](#object.GetResponse)
- [HeadRequest](#object.HeadRequest)
- [HeadResponse](#object.HeadResponse)
- [PutRequest](#object.PutRequest)
- [PutRequest.PutHeader](#object.PutRequest.PutHeader)
- [PutResponse](#object.PutResponse)
- [Range](#object.Range)
- [SearchRequest](#object.SearchRequest)
- [SearchResponse](#object.SearchResponse)
- [object/types.proto](#object/types.proto)
- Messages
- [Attribute](#object.Attribute)
- [CreationPoint](#object.CreationPoint)
- [ExtendedHeader](#object.ExtendedHeader)
- [IntegrityHeader](#object.IntegrityHeader)
- [Link](#object.Link)
- [Object](#object.Object)
- [PublicKey](#object.PublicKey)
- [SystemHeader](#object.SystemHeader)
- [Tombstone](#object.Tombstone)
- [Transform](#object.Transform)
- [Scalar Value Types](#scalar-value-types)
<a name="object/service.proto"></a>
<p align="right"><a href="#top">Top</a></p>
## object/service.proto
<a name="object.Service"></a>
### 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](#object.GetRequest) | [GetResponse](#object.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](#object.PutRequest) | [PutResponse](#object.PutResponse) |
#### Method Delete
Delete the object from a container
| Name | Input | Output |
| ---- | ----- | ------ |
| Delete | [DeleteRequest](#object.DeleteRequest) | [DeleteResponse](#object.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](#object.HeadRequest) | [HeadResponse](#object.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](#object.SearchRequest) | [SearchResponse](#object.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](#object.GetRangeRequest) | [GetRangeResponse](#object.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](#object.GetRangeHashRequest) | [GetRangeHashResponse](#object.GetRangeHashResponse) |
<!-- end services -->
<a name="object.DeleteRequest"></a>
### Message DeleteRequest
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Address | [refs.Address](#refs.Address) | | Address of object (container id + object id) |
| OwnerID | [bytes](#bytes) | | OwnerID is a wallet address |
| Meta | [service.RequestMetaHeader](#service.RequestMetaHeader) | | RequestMetaHeader contains information about request meta headers (should be embedded into message) |
| Verify | [service.RequestVerificationHeader](#service.RequestVerificationHeader) | | RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message) |
<a name="object.DeleteResponse"></a>
### Message DeleteResponse
DeleteResponse is empty because we cannot guarantee permanent object removal
in distributed system.
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) | | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
<a name="object.GetRangeHashRequest"></a>
### Message GetRangeHashRequest
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Address | [refs.Address](#refs.Address) | | Address of object (container id + object id) |
| Ranges | [Range](#object.Range) | repeated | Ranges of object's payload to calculate homomorphic hash |
| Salt | [bytes](#bytes) | | Salt is used to XOR object's payload ranges before hashing, it can be nil |
| Meta | [service.RequestMetaHeader](#service.RequestMetaHeader) | | RequestMetaHeader contains information about request meta headers (should be embedded into message) |
| Verify | [service.RequestVerificationHeader](#service.RequestVerificationHeader) | | RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message) |
<a name="object.GetRangeHashResponse"></a>
### Message GetRangeHashResponse
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Hashes | [bytes](#bytes) | repeated | Hashes is a homomorphic hashes of all ranges |
| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) | | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
<a name="object.GetRangeRequest"></a>
### Message GetRangeRequest
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Address | [refs.Address](#refs.Address) | | Address of object (container id + object id) |
| Range | [Range](#object.Range) | | Range of object's payload to return |
| Meta | [service.RequestMetaHeader](#service.RequestMetaHeader) | | RequestMetaHeader contains information about request meta headers (should be embedded into message) |
| Verify | [service.RequestVerificationHeader](#service.RequestVerificationHeader) | | RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message) |
<a name="object.GetRangeResponse"></a>
### Message GetRangeResponse
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Fragment | [bytes](#bytes) | | Fragment of object's payload |
| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) | | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
<a name="object.GetRequest"></a>
### Message GetRequest
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Address | [refs.Address](#refs.Address) | | Address of object (container id + object id) |
| Meta | [service.RequestMetaHeader](#service.RequestMetaHeader) | | RequestMetaHeader contains information about request meta headers (should be embedded into message) |
| Verify | [service.RequestVerificationHeader](#service.RequestVerificationHeader) | | RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message) |
<a name="object.GetResponse"></a>
### Message GetResponse
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| object | [Object](#object.Object) | | Object header and some payload |
| Chunk | [bytes](#bytes) | | Chunk of remaining payload |
| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) | | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
<a name="object.HeadRequest"></a>
### Message HeadRequest
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Address | [refs.Address](#refs.Address) | | Address of object (container id + object id) |
| FullHeaders | [bool](#bool) | | FullHeaders can be set true for extended headers in the object |
| Meta | [service.RequestMetaHeader](#service.RequestMetaHeader) | | RequestMetaHeader contains information about request meta headers (should be embedded into message) |
| Verify | [service.RequestVerificationHeader](#service.RequestVerificationHeader) | | RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message) |
<a name="object.HeadResponse"></a>
### Message HeadResponse
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Object | [Object](#object.Object) | | Object without payload |
| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) | | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
<a name="object.PutRequest"></a>
### Message PutRequest
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Header | [PutRequest.PutHeader](#object.PutRequest.PutHeader) | | Header should be the first message in the stream |
| Chunk | [bytes](#bytes) | | Chunk should be a remaining message in stream should be chunks |
| Meta | [service.RequestMetaHeader](#service.RequestMetaHeader) | | RequestMetaHeader contains information about request meta headers (should be embedded into message) |
| Verify | [service.RequestVerificationHeader](#service.RequestVerificationHeader) | | RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message) |
<a name="object.PutRequest.PutHeader"></a>
### Message PutRequest.PutHeader
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Object | [Object](#object.Object) | | Object with at least container id and owner id fields |
| CopiesNumber | [uint32](#uint32) | | Number of the object copies to store within the RPC call (zero is processed according to the placement rules) |
<a name="object.PutResponse"></a>
### Message PutResponse
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Address | [refs.Address](#refs.Address) | | Address of object (container id + object id) |
| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) | | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
<a name="object.Range"></a>
### Message Range
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Offset | [uint64](#uint64) | | Offset of the data range |
| Length | [uint64](#uint64) | | Length of the data range |
<a name="object.SearchRequest"></a>
### Message SearchRequest
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| ContainerID | [bytes](#bytes) | | ContainerID for searching the object |
| Query | [bytes](#bytes) | | Query in the binary serialized format |
| QueryVersion | [uint32](#uint32) | | QueryVersion is a version of search query format |
| Meta | [service.RequestMetaHeader](#service.RequestMetaHeader) | | RequestMetaHeader contains information about request meta headers (should be embedded into message) |
| Verify | [service.RequestVerificationHeader](#service.RequestVerificationHeader) | | RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message) |
<a name="object.SearchResponse"></a>
### Message SearchResponse
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Addresses | [refs.Address](#refs.Address) | repeated | Addresses of found objects |
| Meta | [service.ResponseMetaHeader](#service.ResponseMetaHeader) | | ResponseMetaHeader contains meta information based on request processing by server (should be embedded into message) |
<!-- end messages -->
<!-- end enums -->
<a name="object/types.proto"></a>
<p align="right"><a href="#top">Top</a></p>
## object/types.proto
<!-- end services -->
<a name="object.Attribute"></a>
### Message Attribute
Attribute groups the parameters of the object attributes.
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Key | [string](#string) | | Key carries the string key to the object attribute. |
| Value | [string](#string) | | Value carries the string value of the object attribute. |
<a name="object.CreationPoint"></a>
### Message CreationPoint
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| UnixTime | [int64](#int64) | | UnixTime is a date of creation in unixtime format |
| Epoch | [uint64](#uint64) | | Epoch is a date of creation in NeoFS epochs |
<a name="object.ExtendedHeader"></a>
### Message ExtendedHeader
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Link | [Link](#object.Link) | | Link to other objects |
| Redirect | [refs.Address](#refs.Address) | | Redirect not used yet |
| Attribute | [Attribute](#object.Attribute) | | Attribute is a set of K-V object attributes |
| Transform | [Transform](#object.Transform) | | Transform defines transform operation (e.g. payload split) |
| Tombstone | [Tombstone](#object.Tombstone) | | Tombstone header that set up in deleted objects |
| Token | [service.Token](#service.Token) | | Token header contains token of the session within which the object was created |
| HomoHash | [bytes](#bytes) | | HomoHash is a homomorphic hash of original object payload |
| PayloadChecksum | [bytes](#bytes) | | PayloadChecksum of actual object's payload |
| Integrity | [IntegrityHeader](#object.IntegrityHeader) | | Integrity header with checksum of all above headers in the object |
| StorageGroup | [storagegroup.StorageGroup](#storagegroup.StorageGroup) | | StorageGroup contains meta information for the data audit |
| PublicKey | [PublicKey](#object.PublicKey) | | PublicKey of owner of the object. Key is used for verification and can be based on NeoID or x509 cert. |
<a name="object.IntegrityHeader"></a>
### Message IntegrityHeader
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| HeadersChecksum | [bytes](#bytes) | | HeadersChecksum is a checksum of all above headers in the object |
| ChecksumSignature | [bytes](#bytes) | | ChecksumSignature is an user's signature of checksum to verify if it is correct |
<a name="object.Link"></a>
### Message Link
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| type | [Link.Type](#object.Link.Type) | | Type of link |
| ID | [bytes](#bytes) | | ID is an object identifier, is a valid UUIDv4 |
<a name="object.Object"></a>
### Message Object
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| SystemHeader | [SystemHeader](#object.SystemHeader) | | SystemHeader describes system header |
| ExtendedHeaders | [ExtendedHeader](#object.ExtendedHeader) | repeated | ExtendedHeaders describes a set of an extended headers |
| Payload | [bytes](#bytes) | | Payload is an object's payload |
<a name="object.PublicKey"></a>
### Message PublicKey
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Value | [bytes](#bytes) | | Value contains marshaled ecdsa public key |
<a name="object.SystemHeader"></a>
### Message SystemHeader
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| Version | [uint64](#uint64) | | Version of the object structure |
| PayloadLength | [uint64](#uint64) | | PayloadLength is an object payload length |
| ID | [bytes](#bytes) | | ID is an object identifier, is a valid UUIDv4 |
| OwnerID | [bytes](#bytes) | | OwnerID is a wallet address |
| CID | [bytes](#bytes) | | CID is a SHA256 hash of the container structure (container identifier) |
| CreatedAt | [CreationPoint](#object.CreationPoint) | | CreatedAt is a timestamp of object creation |
<a name="object.Tombstone"></a>
### Message Tombstone
<a name="object.Transform"></a>
### Message Transform
| Field | Type | Label | Description |
| ----- | ---- | ----- | ----------- |
| type | [Transform.Type](#object.Transform.Type) | | Type of object transformation |
<!-- end messages -->
<a name="object.Link.Type"></a>
### Link.Type
| Name | Number | Description |
| ---- | ------ | ----------- |
| Unknown | 0 | |
| Parent | 1 | Parent object created during object transformation |
| Previous | 2 | Previous object in the linked list created during object transformation |
| Next | 3 | Next object in the linked list created during object transformation |
| Child | 4 | Child object created during object transformation |
| StorageGroup | 5 | Object that included into this storage group |
<a name="object.Transform.Type"></a>
### Transform.Type
| Name | Number | Description |
| ---- | ------ | ----------- |
| Unknown | 0 | |
| Split | 1 | Split sets when object created after payload split |
| Sign | 2 | Sign sets when object created after re-signing (doesn't used) |
| Mould | 3 | Mould sets when object created after filling missing headers in the object |
<!-- end enums -->
## Scalar Value Types
| .proto Type | Notes | C++ Type | Java Type | Python Type |
| ----------- | ----- | -------- | --------- | ----------- |
| <a name="double" /> double | | double | double | float |
| <a name="float" /> float | | float | float | float |
| <a name="int32" /> 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 |
| <a name="int64" /> 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 |
| <a name="uint32" /> uint32 | Uses variable-length encoding. | uint32 | int | int/long |
| <a name="uint64" /> uint64 | Uses variable-length encoding. | uint64 | long | int/long |
| <a name="sint32" /> sint32 | Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s. | int32 | int | int |
| <a name="sint64" /> sint64 | Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s. | int64 | long | int/long |
| <a name="fixed32" /> fixed32 | Always four bytes. More efficient than uint32 if values are often greater than 2^28. | uint32 | int | int |
| <a name="fixed64" /> fixed64 | Always eight bytes. More efficient than uint64 if values are often greater than 2^56. | uint64 | long | int/long |
| <a name="sfixed32" /> sfixed32 | Always four bytes. | int32 | int | int |
| <a name="sfixed64" /> sfixed64 | Always eight bytes. | int64 | long | int/long |
| <a name="bool" /> bool | | bool | boolean | boolean |
| <a name="string" /> string | A string must always contain UTF-8 encoded or 7-bit ASCII text. | string | String | str/unicode |
| <a name="bytes" /> bytes | May contain any arbitrary sequence of bytes. | string | ByteString | str |
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