mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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0f32efcdaa
* trace sdk initial commit. * fix imports and comments. * remove tracestate * split trace.go * add attribute over limit test. * add comments and restructure span.go and tracer.go * refactor MessageEvent * defer unlock * some more cleanup in span.go * rename *MessageEvent* to *Event* * cleanup comments in trace_test.go * fix typos. * return full string ID for traceID and spanID.
68 lines
2.0 KiB
Go
68 lines
2.0 KiB
Go
// Copyright 2019, OpenTelemetry Authors
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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 trace
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import (
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"math/rand"
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"sync"
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"sync/atomic"
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"go.opentelemetry.io/api/core"
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"go.opentelemetry.io/sdk/trace/internal"
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)
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type defaultIDGenerator struct {
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sync.Mutex
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// Please keep these as the first fields
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// so that these 8 byte fields will be aligned on addresses
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// divisible by 8, on both 32-bit and 64-bit machines when
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// performing atomic increments and accesses.
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// See:
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// * https://github.com/census-instrumentation/opencensus-go/issues/587
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// * https://github.com/census-instrumentation/opencensus-go/issues/865
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// * https://golang.org/pkg/sync/atomic/#pkg-note-BUG
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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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var _ internal.IDGenerator = &defaultIDGenerator{}
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// NewSpanID returns a non-zero span ID from a randomly-chosen sequence.
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func (gen *defaultIDGenerator) NewSpanID() uint64 {
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var id uint64
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for id == 0 {
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id = atomic.AddUint64(&gen.nextSpanID, gen.spanIDInc)
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}
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return id
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}
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// NewTraceID returns a non-zero trace ID from a randomly-chosen sequence.
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// mu should be held while this function is called.
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func (gen *defaultIDGenerator) NewTraceID() core.TraceID {
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gen.Lock()
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defer gen.Unlock()
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// Construct the trace ID from two outputs of traceIDRand, with a constant
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// added to each half for additional entropy.
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tid := core.TraceID{
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High: gen.traceIDRand.Uint64() + gen.traceIDAdd[0],
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Low: gen.traceIDRand.Uint64() + gen.traceIDAdd[1],
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}
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return tid
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}
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