1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package internal
import (
"fmt"
"math/rand"
"sync"
)
// TraceIDGenerator creates identifiers for distributed tracing.
type TraceIDGenerator struct {
sync.Mutex
rnd *rand.Rand
}
// NewTraceIDGenerator creates a new trace identifier generator.
func NewTraceIDGenerator(seed int64) *TraceIDGenerator {
return &TraceIDGenerator{
rnd: rand.New(rand.NewSource(seed)),
}
}
// GenerateTraceID creates a new trace identifier.
func (tg *TraceIDGenerator) GenerateTraceID() string {
tg.Lock()
defer tg.Unlock()
u1 := tg.rnd.Uint32()
u2 := tg.rnd.Uint32()
bits := (uint64(u1) << 32) | uint64(u2)
return fmt.Sprintf("%016x", bits)
}
|
