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    Tracing

    source
    pub(all) struct Tracing {
      tracer : 
    Tracer
      now : () -> Int64
      name : (String, String) -> String
      baggage : Bool
      ignore : Array[String]
    }

    One server span per HTTP request, joined to the trace the request arrived with.

    The layer does three things and no more: it reads traceparent and baggage off the request, it opens a span of kind Server as a child of what it read, and it writes the resulting context back on the response. A request that carried no context starts a trace; one that carried a broken context also starts a trace, because refusing the request over a header would be worse than a missing link in the trace.

    The span reaches the sink when the application returns, with the response status on it. A request the application fails is recorded as an exception event before the error is passed on to the server, which is what an ASGI server keeps.
    impl Layer for Tracing

    Tracing::new

    source
    fn Tracing::new(tracer~ : 
    Tracer    , now~ : () -> Int64, name? : (String, String) -> String, baggage? : Bool, ignore? : Array[String]) -> Tracing

    A tracing layer over tracer.

    Tracing::wrap

    source

    method_and_path

    source
    fn method_and_path(http_method : String, path : String) -> String

    The default span name: the method and the path, e.g. GET /orders/42.

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