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idgenerator.go
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idgenerator.go
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// Copyright The 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 xray // import "go.opentelemetry.io/contrib/propagators/aws/xray"
import (
"context"
crand "crypto/rand"
"encoding/binary"
"encoding/hex"
"math/rand"
"strconv"
"sync"
"time"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
"go.opentelemetry.io/otel/trace"
)
// IDGenerator is used for generating a new traceID and spanID.
type IDGenerator struct {
sync.Mutex
randSource *rand.Rand
}
var _ sdktrace.IDGenerator = &IDGenerator{}
// NewSpanID returns a non-zero span ID from a randomly-chosen sequence.
func (gen *IDGenerator) NewSpanID(ctx context.Context, traceID trace.TraceID) trace.SpanID {
gen.Lock()
defer gen.Unlock()
sid := trace.SpanID{}
_, _ = gen.randSource.Read(sid[:])
return sid
}
// NewIDs returns a non-zero trace ID and a non-zero span ID.
// trace ID returned is based on AWS X-Ray TraceID format.
// - https://docs.aws.amazon.com/xray/latest/devguide/xray-api-sendingdata.html#xray-api-traceids
//
// span ID is from a randomly-chosen sequence.
func (gen *IDGenerator) NewIDs(ctx context.Context) (trace.TraceID, trace.SpanID) {
gen.Lock()
defer gen.Unlock()
tid := trace.TraceID{}
currentTime := getCurrentTimeHex()
copy(tid[:4], currentTime)
_, _ = gen.randSource.Read(tid[4:])
sid := trace.SpanID{}
_, _ = gen.randSource.Read(sid[:])
return tid, sid
}
// NewIDGenerator returns an IDGenerator reference used for sending traces to AWS X-Ray.
func NewIDGenerator() *IDGenerator {
gen := &IDGenerator{}
var rngSeed int64
_ = binary.Read(crand.Reader, binary.LittleEndian, &rngSeed)
gen.randSource = rand.New(rand.NewSource(rngSeed))
return gen
}
func getCurrentTimeHex() []uint8 {
currentTime := time.Now().Unix()
// Ignore error since no expected error should result from this operation
// Odd-length strings and non-hex digits are the only 2 error conditions for hex.DecodeString()
// strconv.FromatInt() do not produce odd-length strings or non-hex digits
currentTimeHex, _ := hex.DecodeString(strconv.FormatInt(currentTime, 16))
return currentTimeHex
}