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44 lines
1.2 KiB
44 lines
1.2 KiB
// Copyright 2016 Google Inc. All rights reserved. |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file. |
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package uuid |
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import ( |
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"encoding/binary" |
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) |
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// NewUUID returns a Version 1 UUID based on the current NodeID and clock |
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// sequence, and the current time. If the NodeID has not been set by SetNodeID |
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// or SetNodeInterface then it will be set automatically. If the NodeID cannot |
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// be set NewUUID returns nil. If clock sequence has not been set by |
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// SetClockSequence then it will be set automatically. If GetTime fails to |
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// return the current NewUUID returns nil and an error. |
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// |
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// In most cases, New should be used. |
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func NewUUID() (UUID, error) { |
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var uuid UUID |
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now, seq, err := GetTime() |
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if err != nil { |
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return uuid, err |
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} |
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timeLow := uint32(now & 0xffffffff) |
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timeMid := uint16((now >> 32) & 0xffff) |
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timeHi := uint16((now >> 48) & 0x0fff) |
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timeHi |= 0x1000 // Version 1 |
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binary.BigEndian.PutUint32(uuid[0:], timeLow) |
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binary.BigEndian.PutUint16(uuid[4:], timeMid) |
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binary.BigEndian.PutUint16(uuid[6:], timeHi) |
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binary.BigEndian.PutUint16(uuid[8:], seq) |
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nodeMu.Lock() |
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if nodeID == zeroID { |
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setNodeInterface("") |
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} |
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copy(uuid[10:], nodeID[:]) |
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nodeMu.Unlock() |
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return uuid, nil |
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}
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