(headers)
| 46 | * @category decoding |
| 47 | */ |
| 48 | export const b3: FromHeaders = (headers) => { |
| 49 | if (!("b3" in headers)) { |
| 50 | return Option.none() |
| 51 | } |
| 52 | const parts = headers["b3"].split("-") |
| 53 | if (parts.length < 2) { |
| 54 | return Option.none() |
| 55 | } |
| 56 | return Option.some(Tracer.externalSpan({ |
| 57 | traceId: parts[0], |
| 58 | spanId: parts[1], |
| 59 | sampled: parts[2] ? parts[2] === "1" : true |
| 60 | })) |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * @since 1.0.0 |