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ulid.go
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/
ulid.go
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// Copyright (c) Mainflux
// SPDX-License-Identifier: Apache-2.0
// Package ulid provides a ULID identity provider.
package ulid
import (
"time"
"github.com/mainflux/mainflux"
"github.com/mainflux/mainflux/pkg/errors"
"github.com/oklog/ulid/v2"
mathrand "math/rand"
)
// ErrGeneratingID indicates error in generating ULID
var ErrGeneratingID = errors.New("generating id failed")
var _ mainflux.IDProvider = (*ulidProvider)(nil)
type ulidProvider struct {
entropy *mathrand.Rand
}
// New instantiates a ULID provider.
func New() mainflux.IDProvider {
seed := time.Now().UnixNano()
source := mathrand.NewSource(seed)
return &ulidProvider{
entropy: mathrand.New(source),
}
}
func (up *ulidProvider) ID() (string, error) {
id, err := ulid.New(ulid.Timestamp(time.Now()), up.entropy)
if err != nil {
return "", err
}
return id.String(), nil
}