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