frostfs-api-go-pogpp/refs/types.go
2020-03-31 10:05:26 +03:00

106 lines
2.7 KiB
Go

// This package contains basic structures implemented in Go, such as
//
// CID - container id
// OwnerID - owner id
// ObjectID - object id
// SGID - storage group id
// Address - contains object id and container id
// UUID - a 128 bit (16 byte) Universal Unique Identifier as defined in RFC 4122
package refs
import (
"crypto/sha256"
"github.com/google/uuid"
"github.com/nspcc-dev/neofs-api-go/chain"
"github.com/nspcc-dev/neofs-api-go/internal"
)
type (
// CID is implementation of ContainerID.
CID [CIDSize]byte
// UUID wrapper over github.com/google/uuid.UUID.
UUID uuid.UUID
// SGID is type alias of UUID.
SGID = UUID
// ObjectID is type alias of UUID.
ObjectID = UUID
// MessageID is type alias of UUID.
MessageID = UUID
// OwnerID is wrapper over neofs-proto/chain.WalletAddress.
OwnerID chain.WalletAddress
)
const (
// UUIDSize contains size of UUID.
UUIDSize = 16
// SGIDSize contains size of SGID.
SGIDSize = UUIDSize
// CIDSize contains size of CID.
CIDSize = sha256.Size
// OwnerIDSize contains size of OwnerID.
OwnerIDSize = chain.AddressLength
// ErrWrongDataSize is raised when passed bytes into Unmarshal have wrong size.
ErrWrongDataSize = internal.Error("wrong data size")
// ErrEmptyOwner is raised when empty OwnerID is passed into container.New.
ErrEmptyOwner = internal.Error("owner cant be empty")
// ErrEmptyCapacity is raised when empty Capacity is passed container.New.
ErrEmptyCapacity = internal.Error("capacity cant be empty")
// ErrEmptyContainer is raised when it CID method is called for an empty container.
ErrEmptyContainer = internal.Error("cannot return ID for empty container")
)
var (
emptyCID = (CID{}).Bytes()
emptyUUID = (UUID{}).Bytes()
emptyOwner = (OwnerID{}).Bytes()
_ internal.Custom = (*CID)(nil)
_ internal.Custom = (*SGID)(nil)
_ internal.Custom = (*UUID)(nil)
_ internal.Custom = (*OwnerID)(nil)
_ internal.Custom = (*ObjectID)(nil)
_ internal.Custom = (*MessageID)(nil)
// NewSGID method alias.
NewSGID = NewUUID
// NewObjectID method alias.
NewObjectID = NewUUID
// NewMessageID method alias.
NewMessageID = NewUUID
)
// NewUUID returns a Random (Version 4) UUID.
//
// The strength of the UUIDs is based on the strength of the crypto/rand
// package.
//
// A note about uniqueness derived from the UUID Wikipedia entry:
//
// Randomly generated UUIDs have 122 random bits. One's annual risk of being
// hit by a meteorite is estimated to be one chance in 17 billion, that
// means the probability is about 0.00000000006 (6 × 10−11),
// equivalent to the odds of creating a few tens of trillions of UUIDs in a
// year and having one duplicate.
func NewUUID() (UUID, error) {
id, err := uuid.NewRandom()
if err != nil {
return UUID{}, err
}
return UUID(id), nil
}