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utils/tracer/generator/id_generator.go

65 lines
1.5 KiB

1 year ago
package generator
import (
"bytes"
"context"
crand "crypto/rand"
"encoding/binary"
"encoding/hex"
"github.com/go-kratos/kratos/v2/transport"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
"go.opentelemetry.io/otel/trace"
"io"
"math/rand"
"sync"
)
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 from a
// randomly-chosen sequence.
func (gen *IDGenerator) NewIDs(ctx context.Context) (trace.TraceID, trace.SpanID) {
gen.Lock()
defer gen.Unlock()
var (
tid = trace.TraceID{}
sid = trace.SpanID{}
tidReader io.Reader
)
tidReader = gen.randSource
if tr, ok := transport.FromServerContext(ctx); ok {
traceId := tr.RequestHeader().Get("Trace-Id")
traceHex, err := hex.DecodeString(traceId)
if err == nil && traceId != "" {
tidReader = bytes.NewBuffer(traceHex)
}
}
_, _ = tidReader.Read(tid[:])
_, _ = gen.randSource.Read(sid[:])
return tid, sid
}
func DefaultIDGenerator() sdktrace.IDGenerator {
gen := &IDGenerator{}
var rngSeed int64
_ = binary.Read(crand.Reader, binary.LittleEndian, &rngSeed)
gen.randSource = rand.New(rand.NewSource(rngSeed))
return gen
}