redeem

Documentation

Index

• Constants
• Variables
• type Alphabet
  • func NewAlphabet(abc string, seed uint64) *Alphabet
  • func (a *Alphabet) Decode(s string) (uint64, error)
  • func (a *Alphabet) Encode(x uint64) string
• type Generator
  • func New() *Generator
  • func NewEx(abc *Alphabet, randBits uint, injectBits uint) *Generator
  • func (g *Generator) Build(tabID, start, count uint) []string
  • func (g *Generator) Decode(id uint64) (uint64, error)
  • func (g *Generator) Encode(tabID, counter uint64) uint64
  • func (g *Generator) Generate(tabId, counter uint64) string
  • func (g *Generator) Verify(id string) (uint64, error)

Constants

const DefaultABC = "ABCDEFGHJKLMNPQRSTUVWXYZ"

Variables

var (
	ErrBadChecksum = errors.New("bad checksum")
)

var (
	ErrBadData = errors.New("bad data")
)

Types

type Alphabet

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

func NewAlphabet

func NewAlphabet(abc string, seed uint64) *Alphabet

NewAlphabet creates a new alphabet from the passed string.

func (*Alphabet) Decode

func (a *Alphabet) Decode(s string) (uint64, error)

func (*Alphabet) Encode

func (a *Alphabet) Encode(x uint64) string

type Generator

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

生成规则与限制 通过一个表格ID和自增序列生成唯一ID 要求表格ID大于0且不能超过65535,自增ID大于0且不超过2^30 默认没有随机 情况下通常占用5-9位字符,例如 1000000 -> URSVUQHEL 1000001 -> JYVTQZGWG 1000002 -> UMVUFLHWS 1000003 -> JYVTPHEDB 1000004 -> URSDGHEGL 1000005 -> JKHZFUCVU 1000006 -> URSDHAUSK 1000007 -> URSVUVTPB 1000008 -> UMAGWTZAX 1000009 -> UMAGLHWAL

func New

func New() *Generator

func NewEx

func NewEx(abc *Alphabet, randBits uint, injectBits uint) *Generator

func (*Generator) Build

func (g *Generator) Build(tabID, start, count uint) []string

func (*Generator) Decode

func (g *Generator) Decode(id uint64) (uint64, error)

func (*Generator) Encode

func (g *Generator) Encode(tabID, counter uint64) uint64

编码格式:counter(32bit) + tabID(4-16bit) + flag(2bit) + random(4) + checksum(2bit)

func (*Generator) Generate

func (g *Generator) Generate(tabId, counter uint64) string

func (*Generator) Verify

func (g *Generator) Verify(id string) (uint64, error)

验证ID是否合法,并返回隐含的TableID信息