opentracing Inject函数分析
与https://bbs.tampermonkey.net.cn/thread-4904-1-1.html逻辑基本一致主要调用carrier的Set函数存储Span数据
```go
func (t *TextMapPropagator) Inject(spanContext MockSpanContext, carrier interface{}) error {
writer, ok := carrier.(opentracing.TextMapWriter)
if !ok {
return opentracing.ErrInvalidCarrier
}
// Ids:
writer.Set(mockTextMapIdsPrefix+"traceid", strconv.Itoa(spanContext.TraceID))
writer.Set(mockTextMapIdsPrefix+"spanid", strconv.Itoa(spanContext.SpanID))
writer.Set(mockTextMapIdsPrefix+"sampled", fmt.Sprint(spanContext.Sampled))
// Baggage:
for baggageKey, baggageVal := range spanContext.Baggage {
safeVal := baggageVal
if t.HTTPHeaders {
safeVal = url.QueryEscape(baggageVal)
}
writer.Set(mockTextMapBaggagePrefix+baggageKey, safeVal)
}
return nil
}
```
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