frostfs-api/proto-docs/container.md

Protocol Documentation

Table of Contents

• container/service.proto

  • Services

    • ContainerService

  • Messages

    • DeleteRequest
    • DeleteRequest.Body
    • DeleteResponse
    • DeleteResponse.Body
    • GetRequest
    • GetRequest.Body
    • GetResponse
    • GetResponse.Body
    • ListRequest
    • ListRequest.Body
    • ListResponse
    • ListResponse.Body
    • PutRequest
    • PutRequest.Body
    • PutResponse
    • PutResponse.Body

• container/types.proto

  • Messages
    • Container
    • Container.Attribute

• Scalar Value Types

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container/service.proto

Service "frost.fs.container.ContainerService"

ContainerService provides API to interact with Container smart contract in FrostFS sidechain via other FrostFS nodes. All of those actions can be done equivalently by directly issuing transactions and RPC calls to sidechain nodes.

rpc Put(PutRequest) returns (PutResponse);
rpc Delete(DeleteRequest) returns (DeleteResponse);
rpc Get(GetRequest) returns (GetResponse);
rpc List(ListRequest) returns (ListResponse);

Method Put

Put invokes Container smart contract's Put method and returns response immediately. After a new block is issued in sidechain, request is verified by Inner Ring nodes. After one more block in sidechain, the container is added into smart contract storage.

Statuses:

• OK (0, SECTION_SUCCESS):
  request to save the container has been sent to the sidechain;
• Common failures (SECTION_FAILURE_COMMON);
• CONTAINER_ACCESS_DENIED (3074, SECTION_CONTAINER):
  container create access denied.

Name	Input	Output
Put	PutRequest	PutResponse

Method Delete

Delete invokes Container smart contract's Delete method and returns response immediately. After a new block is issued in sidechain, request is verified by Inner Ring nodes. After one more block in sidechain, the container is added into smart contract storage.

Statuses:

• OK (0, SECTION_SUCCESS):
  request to remove the container has been sent to the sidechain;
• Common failures (SECTION_FAILURE_COMMON);
• CONTAINER_ACCESS_DENIED (3074, SECTION_CONTAINER):
  container delete access denied.

Name	Input	Output
Delete	DeleteRequest	DeleteResponse

Method Get

Returns container structure from Container smart contract storage.

Statuses:

• OK (0, SECTION_SUCCESS):
  container has been successfully read;
• Common failures (SECTION_FAILURE_COMMON);
• CONTAINER_NOT_FOUND (3072, SECTION_CONTAINER):
  requested container not found;
• CONTAINER_ACCESS_DENIED (3074, SECTION_CONTAINER):
  access to container is denied.

Name	Input	Output
Get	GetRequest	GetResponse

Method List

Returns all owner's containers from 'Container` smart contract' storage.

Statuses:

• OK (0, SECTION_SUCCESS):
  container list has been successfully read;
• Common failures (SECTION_FAILURE_COMMON);
• CONTAINER_ACCESS_DENIED (3074, SECTION_CONTAINER):
  container list access denied.

Name	Input	Output
List	ListRequest	ListResponse

Message DeleteRequest

Container removal request

Field	Type	Label	Description
body	DeleteRequest.Body		Body of container delete request message.
meta_header	frost.fs.session.RequestMetaHeader		Carries request meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	frost.fs.session.RequestVerificationHeader		Carries request verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message DeleteRequest.Body

Container removal request body has signed ContainerID as a proof of the container owner's intent. The signature will be verified by Container smart contract, so signing algorithm must be supported by NeoVM.

Field	Type	Label	Description
container_id	frost.fs.refs.ContainerID		Identifier of the container to delete from FrostFS
signature	frost.fs.refs.SignatureRFC6979		ContainerID signed with the container owner's key according to RFC-6979.

Message DeleteResponse

DeleteResponse has an empty body because delete operation is asynchronous and done via consensus in Inner Ring nodes.

Field	Type	Label	Description
body	DeleteResponse.Body		Body of container delete response message.
meta_header	frost.fs.session.ResponseMetaHeader		Carries response meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	frost.fs.session.ResponseVerificationHeader		Carries response verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message DeleteResponse.Body

DeleteResponse has an empty body because delete operation is asynchronous and done via consensus in Inner Ring nodes.

Message GetRequest

Get container structure

Field	Type	Label	Description
body	GetRequest.Body		Body of container get request message.
meta_header	frost.fs.session.RequestMetaHeader		Carries request meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	frost.fs.session.RequestVerificationHeader		Carries request verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message GetRequest.Body

Get container structure request body.

Field	Type	Label	Description
container_id	frost.fs.refs.ContainerID		Identifier of the container to get

Message GetResponse

Get container structure

Field	Type	Label	Description
body	GetResponse.Body		Body of container get response message.
meta_header	frost.fs.session.ResponseMetaHeader		Carries response meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	frost.fs.session.ResponseVerificationHeader		Carries response verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message GetResponse.Body

Get container response body does not have container structure signature. It has been already verified upon container creation.

Field	Type	Label	Description
container	Container		Requested container structure
signature	frost.fs.refs.SignatureRFC6979		Signature of a stable-marshalled container according to RFC-6979.
session_token	frost.fs.session.SessionToken		Session token if the container has been created within the session

Message ListRequest

List containers

Field	Type	Label	Description
body	ListRequest.Body		Body of list containers request message
meta_header	frost.fs.session.RequestMetaHeader		Carries request meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	frost.fs.session.RequestVerificationHeader		Carries request verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message ListRequest.Body

List containers request body.

Field	Type	Label	Description
owner_id	frost.fs.refs.OwnerID		Identifier of the container owner

Message ListResponse

List containers

Field	Type	Label	Description
body	ListResponse.Body		Body of list containers response message.
meta_header	frost.fs.session.ResponseMetaHeader		Carries response meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	frost.fs.session.ResponseVerificationHeader		Carries response verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message ListResponse.Body

List containers response body.

Field	Type	Label	Description
container_ids	frost.fs.refs.ContainerID	repeated	List of ContainerIDs belonging to the requested OwnerID

Message PutRequest

New FrostFS Container creation request

Field	Type	Label	Description
body	PutRequest.Body		Body of container put request message.
meta_header	frost.fs.session.RequestMetaHeader		Carries request meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	frost.fs.session.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.Body

Container creation request has container structure's signature as a separate field. It's not stored in sidechain, just verified on container creation by Container smart contract. ContainerID is a SHA256 hash of the stable-marshalled container strucutre, hence there is no need for additional signature checks.

Field	Type	Label	Description
container	Container		Container structure to register in FrostFS
signature	frost.fs.refs.SignatureRFC6979		Signature of a stable-marshalled container according to RFC-6979.

Message PutResponse

New FrostFS Container creation response

Field	Type	Label	Description
body	PutResponse.Body		Body of container put response message.
meta_header	frost.fs.session.ResponseMetaHeader		Carries response meta information. Header data is used only to regulate message transport and does not affect request execution.
verify_header	frost.fs.session.ResponseVerificationHeader		Carries response verification information. This header is used to authenticate the nodes of the message route and check the correctness of transmission.

Message PutResponse.Body

Container put response body contains information about the newly registered container as seen by Container smart contract. ContainerID can be calculated beforehand from the container structure and compared to the one returned here to make sure everything has been done as expected.

Field	Type	Label	Description
container_id	frost.fs.refs.ContainerID		Unique identifier of the newly created container

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container/types.proto

Message Container

Container is a structure that defines object placement behaviour. Objects can be stored only within containers. They define placement rule, attributes and access control information. An ID of a container is a 32 byte long SHA256 hash of stable-marshalled container message.

Field	Type	Label	Description
version	frost.fs.refs.Version		Container format version. Effectively, the version of API library used to create the container.
owner_id	frost.fs.refs.OwnerID		Identifier of the container owner
nonce	bytes		Nonce is a 16 byte UUIDv4, used to avoid collisions of ContainerIDs
basic_acl	uint32		BasicACL contains access control rules for the owner, system and others groups, as well as permission bits for BearerToken and Extended ACL
attributes	Container.Attribute	repeated	Attributes represent immutable container's meta data
placement_policy	frost.fs.netmap.PlacementPolicy		Placement policy for the object inside the container

Message Container.Attribute

Attribute is a user-defined Key-Value metadata pair attached to the container. Container attributes are immutable. They are set at the moment of container creation and can never be added or updated.

Key name must be a container-unique valid UTF-8 string. Value can't be empty. Containers with duplicated attribute names or attributes with empty values will be considered invalid.

There are some "well-known" attributes affecting system behaviour:

• [ __SYSTEM__NAME ]
  String of a human-friendly container name registered as a domain in NNS contract.
• [ __SYSTEM__ZONE ]
  String of a zone for __SYSTEM__NAME. Used as a TLD of a domain name in NNS contract. If no zone is specified, use default zone: container.
• [ __SYSTEM__DISABLE_HOMOMORPHIC_HASHING ]
  Disables homomorphic hashing for the container if the value equals "true" string. Any other values are interpreted as missing attribute. Container could be accepted in a FrostFS network only if the global network hashing configuration value corresponds with that attribute's value. After container inclusion, network setting is ignored.

And some well-known attributes used by applications only:

• Name
  Human-friendly name
• Timestamp
  User-defined local time of container creation in Unix Timestamp format

Field	Type	Label	Description
key	string		Attribute name key
value	string		Attribute value

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