41 lines
880 B
Go
41 lines
880 B
Go
// Package uid generates unique IDs.
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package uid
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import (
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"github.com/speps/go-hashids"
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"go.uber.org/atomic"
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)
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// Generator generates unique incrementing IDs. These IDs are only comparable
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// with other IDs from this generator.
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type Generator struct {
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hid *hashids.HashID
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next atomic.Int64
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}
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// NewGenerator creates a new Generator with the specified salt. Generators
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// with the same salt generate the same IDs in order.
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func NewGenerator(salt string) *Generator {
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hd := hashids.NewData()
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hd.MinLength = 8
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hd.Salt = salt
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hid, err := hashids.NewWithData(hd)
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if err != nil {
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panic(err)
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}
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return &Generator{
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hid: hid,
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}
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}
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// Next gets the next ID, in both an encoded string form and the raw integer form.
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func (g *Generator) Next() (string, int64) {
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v := g.next.Inc()
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id, err := g.hid.EncodeInt64([]int64{v})
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if err != nil {
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panic(err)
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}
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return id, v
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}
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