Consume ServiceInfo data building ServiceInfoData structure

[Luni-4]

Currently, I'm facing a specific workflow which needs to consume ServiceInfo. In my opinion, it would be helpful to add a ServiceInfoData structure containing all information that can be retrieved through get_* functions.

Something like:

impl ServiceInfo {
  pub fn service_info_data(self) -> ServiceInfoData {
      ServiceInfoData {
             fullname: self.fullname,
             addresses: self.addresses,
             port: self.port,
             properties: self.properties.properties_data(),
             ...
      }
  }
}

The example above is not exhaustive, therefore some public fields are missing. This approach would reduce the amount of allocations to be performed when ServiceInfo must not be saved.

[keepsimple1]

You have a good point. Do you intend to use ServiceInfoData only on the client (browser) side?

I think the problem is that currently the same ServiceInfo struct is used in both the server and the client, i.e. in publishing a service (register) and in resolving a service instance (ServiceEvent::ServiceResolved)

We probably should have defined a different struct for the client side in resolving a service, that contains the attributes as in ServiceInfoData you mentioned. Assuming you intend to use ServiceInfoData only on the client side, I think there are a couple of options going forward:

1. Like you suggested, add a new method in ServiceInfo to return a new struct. The only thing is that I felt the name ServiceInfoData could cause confusions, as data is quite generic and similar to info.

2. Replace the struct in ServiceResolved(ServiceInfo) with a new struct that is smaller than ServiceInfo and it's clearly only used on the client side. The downside is that it will be a breaking change, even if we provide all same getter functions of ServiceInfo.

In both options, how about naming the new struct ResolvedService ? It clearly indicates the purpose of the struct, and will only used by the client side.

What do you think?

[Luni-4]

You have a good point. Do you intend to use ServiceInfoData only on the client (browser) side?

Yep, exactly, only on the client side.

I think the problem is that currently the same ServiceInfo struct is used in both the server and the client, i.e. in publishing a service (register) and in resolving a service instance (ServiceEvent::ServiceResolved)

We probably should have defined a different struct for the client side in resolving a service, that contains the attributes as in ServiceInfoData you mentioned. Assuming you intend to use ServiceInfoData only on the client side, I think there are a couple of options going forward:

1. Like you suggested, add a new method in `ServiceInfo` to return a new struct.  The only thing is that I felt the name `ServiceInfoData` could cause confusions, as `data` is quite generic and similar to `info`.

2. Replace the struct in `ServiceResolved(ServiceInfo)` with a new struct that is smaller than `ServiceInfo` and it's clearly only used on the client side.  The downside is that it will be a breaking change, even if we provide all same `getter` functions  of `ServiceInfo`.

In both options, how about naming the new struct ResolvedService ? It clearly indicates the purpose of the struct, and will only used by the client side.

What do you think?

I agree with differentiating server and client side because they deal with separate things. I really like the first option because it's simpler and ResolvedService is a good name in my opinion. However, I cannot figure out the breaking change issue with the second option though, perhaps are there some problems, that I am not aware of, if we publish the 0.14.0 version?