mirror of
https://github.com/golang/go
synced 2024-11-05 16:56:16 -07:00
cf0cb92717
internal/telemetry/event was renamed to internal/event/core Some things were partly moved from internal/telemetry/event straight to internal/event to minimize churn in the following restructuring. Change-Id: I8511241c68d2d05f64c52dbe04748086dd325158 Reviewed-on: https://go-review.googlesource.com/c/tools/+/229237 Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
// Copyright 2019 The Go Authors. 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 export
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import (
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crand "crypto/rand"
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"encoding/binary"
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"fmt"
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"math/rand"
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"sync"
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"sync/atomic"
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)
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type TraceID [16]byte
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type SpanID [8]byte
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func (t TraceID) String() string {
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return fmt.Sprintf("%02x", t[:])
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}
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func (s SpanID) String() string {
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return fmt.Sprintf("%02x", s[:])
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}
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func (s SpanID) IsValid() bool {
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return s != SpanID{}
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}
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var (
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generationMu sync.Mutex
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nextSpanID uint64
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spanIDInc uint64
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traceIDAdd [2]uint64
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traceIDRand *rand.Rand
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)
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func initGenerator() {
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var rngSeed int64
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for _, p := range []interface{}{
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&rngSeed, &traceIDAdd, &nextSpanID, &spanIDInc,
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} {
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binary.Read(crand.Reader, binary.LittleEndian, p)
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}
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traceIDRand = rand.New(rand.NewSource(rngSeed))
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spanIDInc |= 1
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}
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func newTraceID() TraceID {
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generationMu.Lock()
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defer generationMu.Unlock()
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if traceIDRand == nil {
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initGenerator()
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}
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var tid [16]byte
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binary.LittleEndian.PutUint64(tid[0:8], traceIDRand.Uint64()+traceIDAdd[0])
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binary.LittleEndian.PutUint64(tid[8:16], traceIDRand.Uint64()+traceIDAdd[1])
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return tid
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}
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func newSpanID() SpanID {
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var id uint64
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for id == 0 {
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id = atomic.AddUint64(&nextSpanID, spanIDInc)
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}
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var sid [8]byte
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binary.LittleEndian.PutUint64(sid[:], id)
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return sid
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}
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