snowflake

Documentation

Overview

Package snowflake provides a very simple Twitter snowflake generator and parser.

Index

• Variables
• func SetDefaultNode(nodeBit int64)
• type ID
  • func Generate() ID
  • func ParseBase16(id string) (ID, error)
  • func ParseBase2(id string) (ID, error)
  • func ParseBase32(b []byte) (ID, error)
  • func ParseBase36(id string) (ID, error)
  • func ParseBase58(b []byte) (ID, error)
  • func ParseBase64(id string) (ID, error)
  • func ParseBase8(id string) (ID, error)
  • func ParseBytes(id []byte) (ID, error)
  • func ParseInt64(id int64) ID
  • func ParseIntBytes(id [8]byte) ID
  • func ParseString(id string) (ID, error)
  • func (f ID) Base16() string
  • func (f ID) Base2() string
  • func (f ID) Base32() string
  • func (f ID) Base36() string
  • func (f ID) Base58() string
  • func (f ID) Base64() string
  • func (f ID) Base8() string
  • func (f ID) Bytes() []byte
  • func (f ID) Int64() int64
  • func (f ID) IntBytes() [8]byte
  • func (f ID) MarshalJSON() ([]byte, error)
  • func (f ID) Node() int64
  • func (f ID) Step() int64
  • func (f ID) String() string
  • func (f ID) Time() int64
  • func (f *ID) UnmarshalJSON(b []byte) error
• type JSONSyntaxError
  • func (j JSONSyntaxError) Error() string
• type Node
  • func NewNode(node int64) (*Node, error)
  • func (n *Node) Generate() ID

Variables

var (
	// Epoch is set to the twitter snowflake epoch of Jan 01 2012 00:00:00 UTC in milliseconds
	// You may customize this to set a different epoch for your application.
	Epoch int64 = 1640966400000

	// NodeBits holds the number of bits to use for Node
	// Remember, you have a total 22 bits to share between Node/Step
	NodeBits uint8 = 10

	// StepBits holds the number of bits to use for Step
	// Remember, you have a total 22 bits to share between Node/Step
	StepBits uint8 = 12
)

var ErrInvalidBase32 = errors.New("invalid base32")

ErrInvalidBase32 is returned by ParseBase32 when given an invalid []byte

var ErrInvalidBase58 = errors.New("invalid base58")

ErrInvalidBase58 is returned by ParseBase58 when given an invalid []byte

Functions

func SetDefaultNode

func SetDefaultNode(nodeBit int64)

Types

type ID

type ID int64

An ID is a custom type used for a snowflake ID. This is used so we can attach methods onto the ID.

func Generate

func Generate() ID

Generate returns a snowflake ID

func ParseBase16

func ParseBase16(id string) (ID, error)

ParseBase16 converts a Base16 string into a snowflake ID

func ParseBase2

func ParseBase2(id string) (ID, error)

ParseBase2 converts a Base2 string into a snowflake ID

func ParseBase32

func ParseBase32(b []byte) (ID, error)

ParseBase32 parses a base32 []byte into a snowflake ID NOTE: There are many different base32 implementations so becareful when doing any interoperation.

func ParseBase36

func ParseBase36(id string) (ID, error)

ParseBase36 converts a Base36 string into a snowflake ID

func ParseBase58

func ParseBase58(b []byte) (ID, error)

ParseBase58 parses a base58 []byte into a snowflake ID

func ParseBase64

func ParseBase64(id string) (ID, error)

ParseBase64 converts a base64 string into a snowflake ID

func ParseBase8

func ParseBase8(id string) (ID, error)

ParseBase8 converts a Base8 string into a snowflake ID

func ParseBytes

func ParseBytes(id []byte) (ID, error)

ParseBytes converts a byte slice into a snowflake ID

func ParseInt64

func ParseInt64(id int64) ID

ParseInt64 converts an int64 into a snowflake ID

func ParseIntBytes

func ParseIntBytes(id [8]byte) ID

ParseIntBytes converts an array of bytes encoded as big endian integer as a snowflake ID

func ParseString

func ParseString(id string) (ID, error)

ParseString converts a string into a snowflake ID

func (ID) Base16

func (f ID) Base16() string

Base16 returns a string base16 of the snowflake ID

func (ID) Base2

func (f ID) Base2() string

Base2 returns a string base2 of the snowflake ID

func (ID) Base32

func (f ID) Base32() string

Base32 uses the z-base-32 character set but encodes and decodes similar to base58, allowing it to create an even smaller result string. NOTE: There are many different base32 implementations so becareful when doing any interoperation.

func (ID) Base36

func (f ID) Base36() string

Base36 returns a base36 string of the snowflake ID

func (ID) Base58

func (f ID) Base58() string

Base58 returns a base58 string of the snowflake ID

func (ID) Base64

func (f ID) Base64() string

Base64 returns a base64 string of the snowflake ID

func (ID) Base8

func (f ID) Base8() string

Base8 returns a string base8 of the snowflake ID

func (ID) Bytes

func (f ID) Bytes() []byte

Bytes returns a byte slice of the snowflake ID

func (ID) Int64

func (f ID) Int64() int64

Int64 returns an int64 of the snowflake ID

func (ID) IntBytes

func (f ID) IntBytes() [8]byte

IntBytes returns an array of bytes of the snowflake ID, encoded as a big endian integer.

func (ID) MarshalJSON

func (f ID) MarshalJSON() ([]byte, error)

MarshalJSON returns a json byte array string of the snowflake ID.

func (ID) Node

func (f ID) Node() int64

Node returns an int64 of the snowflake ID node number

func (ID) Step

func (f ID) Step() int64

Step returns an int64 of the snowflake step (or sequence) number

func (ID) String

func (f ID) String() string

String returns a string of the snowflake ID

func (ID) Time

func (f ID) Time() int64

Time returns an int64 unix timestamp in milliseconds of the snowflake ID time

func (*ID) UnmarshalJSON

func (f *ID) UnmarshalJSON(b []byte) error

UnmarshalJSON converts a json byte array of a snowflake ID into an ID type.

type JSONSyntaxError

type JSONSyntaxError struct {
	// contains filtered or unexported fields
}

A JSONSyntaxError is returned from UnmarshalJSON if an invalid ID is provided.

func (JSONSyntaxError) Error

func (j JSONSyntaxError) Error() string

type Node

type Node struct {
	// contains filtered or unexported fields
}

A Node struct holds the basic information needed for a snowflake generator node

func NewNode

func NewNode(node int64) (*Node, error)

NewNode returns a new snowflake node that can be used to generate snowflake IDs

func (*Node) Generate

func (n *Node) Generate() ID

Generate creates and returns a unique snowflake ID To help guarantee uniqueness - Make sure your system is keeping accurate system time - Make sure you never have multiple nodes running with the same node ID