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