snowflake

Documentation

Overview

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

Index

• Variables
• type ID
  • 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 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) 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) 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 Nov 04 2010 01:42:54 UTC in milliseconds
	// You may customize this to set a different epoch for your application.
	Epoch int64 = 1288834974657

	// 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

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 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 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) 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) 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 DEPRECATED: the below function will be removed in a future release.

func (ID) Step

func (f ID) Step() int64

Step returns an int64 of the snowflake step (or sequence) number DEPRECATED: the below function will be removed in a future release.

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 DEPRECATED: the below function will be removed in a future release.

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