Module interceptors 

Aspect-oriented interceptors.

An Interceptor sits around a handler: it sees the inbound RequestContext before extraction and the Response on the way out. Use it for logging, timing, response envelopes, caching — anything that shouldn’t live in handler bodies.

Apply with the #[UseInterceptors(...)] attribute on a handler or controller impl block. Multiple interceptors compose in declaration order (first listed = outermost layer).

Structs

EnvelopeResponse

Wrap successful JSON responses in { "data": ... }. Errors pass through untouched so RFC 7807 ProblemDetails reaches the client verbatim.

LatencyLog

Log method + path + status + latency on each request.

NextHandler

Continuation handed to an interceptor. Calling .run(ctx) invokes the next layer (or the handler itself if this is the innermost interceptor).

TelemetryLog

Emit a structured log line for every request via the tracing crate.

TraceInterceptor

Full-stack observability interceptor: structured log + OTLP span + Prometheus.

Traits

Interceptor

One layer of the aspect chain.