Axum playground

Axum is an ergonomic and modular web framework in Rust, built with Tokio, Tower and Hyper

This is just a relatively simple hello world app to try things out, specifically:

• main server running on port 3000
  • GET / -> "hello world"
• metrics server running on port 3001 (prometheus format)
  • GET /metrics
• graceful shutdown of both servers in response to ctrl-c (it works, but take a little while, just be patient)
• distributed tracing using OpenTelmetry
  • configured (through ENV) to send spans to a local Jaeger instance via gRPC (can run ./local-tracing.sh to start up an all-in-one jaeger instance in docker)

Running

OTEL_SERVICE_NAME=axum-hello OTEL_TRACES_SAMPLER="always_on" OTEL_EXPORTER_OTLP_PROTOCOL="grpc" OTEL_EXPORTER_OTLP_ENDPOINT="http://localhost:4317" cargo run

TODO

This is really rough, cleanup... especially OTEL startup/env code Figure out dependencies - there were a lot added trying to figure out the error:

OpenTelemetry trace error occurred. Exporter otlp encountered the following error(s): no http client, you must select one from features or provide your own implementation