New gRPC endpoint to query for connection GenesisState

[adizere]

Summary

Is there a way to query for GenesisState of connection?

ibc-go/proto/ibc/core/connection/v1/genesis.proto

Line 11 in d059913

message GenesisState {

In the relayer implementation, we need to programatically obtain the Params in there.

Problem Definition

Why do we need this feature?

We need the Params specifically for max_expected_time_per_block which is essential in the implementation of connection (block) delay

Proposal

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For Admin Use

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[colin-axner]

I believe there is a way. If I understand correctly, the information you want is simply the current value of the max_expected_time_per_block, not necessarily the genesis value (since it is a param, gov can change it over time). If so, params has it's own grpc. I believe the subspace is "ibc" (I may be mistaken), and the key is this

The SDK has plans to remove x/params in the future, so future versions may require IBC to manage our own parameters, in which case we will expose a similar grpc for retrieving this value

[colin-axner]

I opened #2069. We will try to integrate this gRPC early so that when x/params are deprecated, most chains should support the params gRPC associated with 03-connection

[adizere]

Thanks Colin & Carlos for shepherding this request.

I think the present issue #1628 can be closed in favor of #2069. The latter issue should be sufficient for operator needs, in particular for informalsystems/hermes#2037 and implementation of connection delay.

[crodriguezvega]

Thanks, @adizere!