chore : add selected channel version to MsgChanOpenInitResponse and M…

…sgChanOpenTryResponse (cosmos#1279)

## Description
 - Add a version field to MsgChannelOpenInitResponse and MsgChannelOpenTryResponse in proto and gen proto
 - Set the selected channel version in the [MsgChannelOpenInitResponse](https://github.com/notional-labs/ibc-go/blob/ed7a082565fadb9ce27067fa1efb56c23fafc8ef/modules/core/keeper/msg_server.go#L197) and [MsgChannelOpenTryResponse](https://github.com/notional-labs/ibc-go/blob/ed7a082565fadb9ce27067fa1efb56c23fafc8ef/modules/core/keeper/msg_server.go#L237) 


---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

- [ ] Targeted PR against correct branch (see [CONTRIBUTING.md](https://github.com/cosmos/ibc-go/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
- [ ] Code follows the [module structure standards](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules/structure.md).
- [ ] Wrote unit and integration [tests](https://github.com/cosmos/ibc-go/blob/master/CONTRIBUTING.md#testing)
- [ ] Updated relevant documentation (`docs/`) or specification (`x/<module>/spec/`)
- [ ] Added relevant `godoc` [comments](https://blog.golang.org/godoc-documenting-go-code).
- [ ] Added a relevant changelog entry to the `Unreleased` section in `CHANGELOG.md`
- [ ] Re-reviewed `Files changed` in the Github PR explorer
- [ ] Review `Codecov Report` in the comment section below once CI passes


closes: cosmos#1204

CHANGELOG.md

@@ -50,7 +50,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * (middleware) [\#1022](https://github.com/cosmos/ibc-go/pull/1022) Add `GetAppVersion` to the ICS4Wrapper interface. This function should be used by IBC applications to obtain their own version since the version set in the channel structure may be wrapped many times by middleware. 
 * (modules/core/04-channel) [\#1160](https://github.com/cosmos/ibc-go/pull/1160) Improve `uint64 -> string` performance in `Logger`.
-* (modules/core/04-channel) [\#1232](https://github.com/cosmos/ibc-go/pull/1232) Updating params on `NewPacketId` and moving to bottom of file.   
+* (modules/core/04-channel) [\#1232](https://github.com/cosmos/ibc-go/pull/1232) Updating params on `NewPacketId` and moving to bottom of file. 
+* (modules/core/04-channel) [\#1279](https://github.com/cosmos/ibc-go/pull/1279) Add selected channel version to MsgChanOpenInitResponse and MsgChanOpenTryResponse. Emit channel version during OpenInit/OpenTry
 
 ### Features
 

docs/ibc/proto-docs.md

@@ -2809,6 +2809,7 @@ MsgChannelOpenInitResponse defines the Msg/ChannelOpenInit response type.
 | Field | Type | Label | Description |
 | ----- | ---- | ----- | ----------- |
 | `channel_id` | [string](#string) |  |  |
+| `version` | [string](#string) |  |  |
 
 
 
@@ -2844,6 +2845,11 @@ value will be ignored by core IBC.
 MsgChannelOpenTryResponse defines the Msg/ChannelOpenTry response type.
 
 
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| `version` | [string](#string) |  |  |
+
+
 
 
 

modules/core/04-channel/keeper/events.go

@@ -20,6 +20,7 @@ func EmitChannelOpenInitEvent(ctx sdk.Context, portID string, channelID string,
 			sdk.NewAttribute(types.AttributeCounterpartyPortID, channel.Counterparty.PortId),
 			sdk.NewAttribute(types.AttributeCounterpartyChannelID, channel.Counterparty.ChannelId),
 			sdk.NewAttribute(types.AttributeKeyConnectionID, channel.ConnectionHops[0]),
+			sdk.NewAttribute(types.AttributeVersion, channel.Version),
 		),
 	})
 
@@ -41,6 +42,7 @@ func EmitChannelOpenTryEvent(ctx sdk.Context, portID string, channelID string, c
 			sdk.NewAttribute(types.AttributeCounterpartyPortID, channel.Counterparty.PortId),
 			sdk.NewAttribute(types.AttributeCounterpartyChannelID, channel.Counterparty.ChannelId),
 			sdk.NewAttribute(types.AttributeKeyConnectionID, channel.ConnectionHops[0]),
+			sdk.NewAttribute(types.AttributeVersion, channel.Version),
 		),
 	})
 	ctx.EventManager().EmitEvents(sdk.Events{

modules/core/04-channel/types/events.go

@@ -11,6 +11,7 @@ const (
 	AttributeKeyConnectionID       = "connection_id"
 	AttributeKeyPortID             = "port_id"
 	AttributeKeyChannelID          = "channel_id"
+	AttributeVersion               = "version"
 	AttributeCounterpartyPortID    = "counterparty_port_id"
 	AttributeCounterpartyChannelID = "counterparty_channel_id"
 

modules/core/keeper/msg_server.go

@@ -194,6 +194,7 @@ func (k Keeper) ChannelOpenInit(goCtx context.Context, msg *channeltypes.MsgChan
 
 	return &channeltypes.MsgChannelOpenInitResponse{
 		ChannelId: channelID,
+		Version:   msg.Channel.Version,
 	}, nil
 }
 
@@ -232,7 +233,9 @@ func (k Keeper) ChannelOpenTry(goCtx context.Context, msg *channeltypes.MsgChann
 	// Write channel into state
 	k.ChannelKeeper.WriteOpenTryChannel(ctx, msg.PortId, channelID, msg.Channel.Ordering, msg.Channel.ConnectionHops, msg.Channel.Counterparty, version)
 
-	return &channeltypes.MsgChannelOpenTryResponse{}, nil
+	return &channeltypes.MsgChannelOpenTryResponse{
+		Version: version,
+	}, nil
 }
 
 // ChannelOpenAck defines a rpc handler method for MsgChannelOpenAck.

proto/ibc/core/channel/v1/tx.proto

@@ -68,6 +68,7 @@ message MsgChannelOpenInit {
 // MsgChannelOpenInitResponse defines the Msg/ChannelOpenInit response type.
 message MsgChannelOpenInitResponse {
   string channel_id = 1 [(gogoproto.moretags) = "yaml:\"channel_id\""];
+  string version    = 2;
 }
 
 // MsgChannelOpenInit defines a msg sent by a Relayer to try to open a channel
@@ -91,7 +92,9 @@ message MsgChannelOpenTry {
 }
 
 // MsgChannelOpenTryResponse defines the Msg/ChannelOpenTry response type.
-message MsgChannelOpenTryResponse {}
+message MsgChannelOpenTryResponse {
+  string version = 1;
+}
 
 // MsgChannelOpenAck defines a msg sent by a Relayer to Chain A to acknowledge
 // the change of channel state to TRYOPEN on Chain B.