middleware

Middleware, authentication and dependencies

main.go registers one existing Nirvana descriptor and one Huma operation on the same Nirvana builder:

• accessLog is a Nirvana node middleware on the root descriptor. It derives the request context with a request ID, rejects requests without Authorization: Bearer demo with 401 before any handler runs, and logs the route template and final status, including Huma errors. When the middleware itself returns an error, Nirvana writes that response after the middleware returns, so it logs the error instead of a status.
• Greeter is created by the application and shared by both handlers. The library does not create or scope dependencies.
• The Huma handler reads the request ID that the Nirvana middleware put in the context.

go run ./examples/middleware -listen 127.0.0.1:18080
curl -i -H 'Authorization: Bearer demo' -H 'X-Request-ID: r1' http://127.0.0.1:18080/legacy/greeting
curl -i -H 'Authorization: Bearer demo' -H 'X-Request-ID: r2' http://127.0.0.1:18080/greetings/ada
curl -i http://127.0.0.1:18080/greetings/ada

For moving an operation between the original and migrated runtime and rolling it back, see the coexistence example in examples/coexist and the migration guide.