Make uuid middleware work with other service-registry than mdns

[IljaN]

See https://github.com/owncloud-docker/compose-playground/blob/master/examples/services/add-user/add-user.go#L17 for an example. Maybe there is even a better way which does not require instantiation of a new service?

Micro controls the service-registry type with the environment variable MICRO_REGISTRY. This setting does not work because the proxy is not wrapped in a micro-service.

Two possible routes to fix this:

• Use the micro way and wrap the proxy in to a service.
• Manually instantiate a dummy service and use it`s client. (like in the example above)

[butonic]

AFAIU the default registry is mdns, but it can be changed to etcd by setting MICRO_REGISTRY="etcd".
Other implementations, eg consul or nats are available as plugins

but ... we need to pass the registry Option to the micro client as well, because the exampleso use the micre cmd which parses the env variable and passes it accordingly https://github.com/micro/go-micro/blob/4f0f4326df8bef9c0d1b81d79792500b38a942f2/config/cmd/cmd.go#L440

[phil-davis]

@IljaN @butonic this is an old issue that was transferred from the archived ocis-proxy repo a few weeks ago.
Please close if no longer relevant.