opentelemetry-go/sdk/trace/trace.go

// Copyright 2019, OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package trace

import (
	crand "crypto/rand"
	"encoding/binary"
	"math/rand"

	"go.opentelemetry.io/otel/sdk/trace/internal"
)

func defIDGenerator() internal.IDGenerator {
	gen := &defaultIDGenerator{}
	var rngSeed int64
	_ = binary.Read(crand.Reader, binary.LittleEndian, &rngSeed)
	gen.randSource = rand.New(rand.NewSource(rngSeed))
	return gen
}