Crate futures_zipkin

Futures support for Zipkin tracing.

The Tracer type uses thread local storage to track the current span. This works well in blocking applications where a unit of work "owns" a thread while it's running. However, it is less appropriate for futures-based applications where multiple distinct futures are being evaluated on the same thread in an interleaved fashion.

This crate provides a wrapper Future which ensures that the thread-local current span is set appropriately whenever the inner Future is running.

Structs

SpannedFuture

A wrapping Future which ensures that a Zipkin span is active while its inner future runs.