5a9d8c792b
V2 is compliant with api.openshift.com design guidelines. Errors are predefined, have codes, and are queryable. All requests have an operationId set: a unique identifier which is sortable by time. This is added to the response in case of an error. All returned objects have the href, id, and kind field set.
55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
package ksuid
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import (
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cryptoRand "crypto/rand"
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"encoding/binary"
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"io"
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"math/rand"
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)
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// FastRander is an io.Reader that uses math/rand and is optimized for
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// generating 16 bytes KSUID payloads. It is intended to be used as a
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// performance improvements for programs that have no need for
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// cryptographically secure KSUIDs and are generating a lot of them.
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var FastRander = newRBG()
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func newRBG() io.Reader {
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r, err := newRandomBitsGenerator()
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if err != nil {
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panic(err)
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}
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return r
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}
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func newRandomBitsGenerator() (r io.Reader, err error) {
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var seed int64
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if seed, err = readCryptoRandomSeed(); err != nil {
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return
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}
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r = &randSourceReader{source: rand.NewSource(seed).(rand.Source64)}
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return
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}
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func readCryptoRandomSeed() (seed int64, err error) {
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var b [8]byte
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if _, err = io.ReadFull(cryptoRand.Reader, b[:]); err != nil {
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return
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}
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seed = int64(binary.LittleEndian.Uint64(b[:]))
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return
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}
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type randSourceReader struct {
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source rand.Source64
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}
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func (r *randSourceReader) Read(b []byte) (int, error) {
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// optimized for generating 16 bytes payloads
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binary.LittleEndian.PutUint64(b[:8], r.source.Uint64())
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binary.LittleEndian.PutUint64(b[8:], r.source.Uint64())
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return 16, nil
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}
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