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https://github.com/rclone/rclone.git
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49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
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// Copyright (C) 2015 Space Monkey, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package monkit
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import (
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crand "crypto/rand"
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"encoding/binary"
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"math/rand"
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"sync/atomic"
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"github.com/spacemonkeygo/monkit/v3/monotime"
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)
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var (
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idCounter uint64
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inc uint64
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)
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func init() {
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var buf [16]byte
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if _, err := crand.Read(buf[:]); err == nil {
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idCounter = binary.BigEndian.Uint64(buf[0:8]) >> 1
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inc = binary.BigEndian.Uint64(buf[0:8])>>1 | 3
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} else {
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rng := rand.New(rand.NewSource(monotime.Now().UnixNano()))
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idCounter = uint64(rng.Int63())
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inc = uint64(rng.Int63() | 3)
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}
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}
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// NewId returns a random integer intended for use when constructing new
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// traces. See NewTrace.
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func NewId() int64 {
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id := atomic.AddUint64(&idCounter, inc)
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return int64(id >> 1)
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}
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