Tracing: looking at how incoming messages move through the system - ResponseManager

[hannahhoward]

Goals

It might be nice to understand how long is spent processing incoming requests

Essentially:

• create a span in ResponseManager.processRequests https://github.com/ipfs/go-graphsync/blob/main/responsemanager/server.go#L170
• make a link from the span and for each request being processed:
  • if it's a new request, link it to the new request span:

    go-graphsync/responsemanager/server.go

    Line 183 in 655606b

    ctx, responseSpan := otel.Tracer("graphsync").Start(ctx, "response", trace.WithAttributes(

    
    -if it's an update, link it to the update span --

    go-graphsync/responsemanager/server.go

    Line 67 in 655606b

    _, span := otel.Tracer("graphsync").Start(trace.ContextWithSpan(rm.ctx, response.span), "processUpdate", trace.WithAttributes(

  • if its a cancel, link it to the abortRequest span --

    go-graphsync/responsemanager/server.go

    Line 138 in 655606b

    _, span := otel.Tracer("graphsync").Start(trace.ContextWithSpan(rm.ctx, response.span), "abortRequest")