[resteasy-dev] Microprofile OpenTracing integration for WF Swarm

[Pavol Loffay]

Hi,

I am looking at microprofile-opentracing integration for Wildfly Swarm.
Briefly, it is a distributed tracing for JAX-RS both server and client.

Issue [1] describes what is necessary. But I will repeat here:

Server
1. register server jax-rs filters (no problem, server features are
auto-discovered)
2. use servlet filter to finish the span and log any exception to the span
- because jax-rs filters do not capture exceptions

Client
1. register tracing filters
2. use OpenTracing-aware ExecutorService - it's needed for async API to
correctly propagate parent.
(3.) TCK is not defined yet. However, if they want to create spans for
UnknownHostException then we cannot use jax-rs client filters because they
are not executed. Network attempt happens before the filter when the
exception is thrown. To solve this we have to implement tracing in
resteasy or supply apache HC with tracing filters enabled (it also has some
problems).


The biggest issue is with client because we need
`ClientBuilder.newBuilder()` to return client/builder with enabled tracing.

[1] https://issues.jboss.org/browse/SWARM-1691


-- 

PAVOL LOFFAY

Red Hat Česká republika <https://www.redhat.com/>

Purkyňova 115 TPB-B 612 00 Brno

M: +421948286055
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