refactor: channel handshake version improvements #1283

seantking · 2022-04-21T14:43:48Z

Description

closes: #722

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)
Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
Code follows the module structure standards.
Wrote unit and integration tests
Updated relevant documentation (docs/) or specification (x/<module>/spec/)
Added relevant godoc comments.
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

seantking · 2022-04-21T15:27:10Z

modules/core/keeper/msg_server.go

 		return nil, sdkerrors.Wrap(err, "channel open init callback failed")
 	}

 	// Write channel into state
-	k.ChannelKeeper.WriteOpenInitChannel(ctx, msg.PortId, channelID, msg.Channel.Ordering, msg.Channel.ConnectionHops, msg.Channel.Counterparty, msg.Channel.Version)
+	k.ChannelKeeper.WriteOpenInitChannel(ctx, msg.PortId, channelID, msg.Channel.Ordering, msg.Channel.ConnectionHops, msg.Channel.Counterparty, version)


Changing this causes the fee tests to break. Looking into it 👀

Needed: 0178c09

modules/core/05-port/types/module.go

modules/apps/transfer/ibc_module.go

modules/apps/29-fee/ibc_module.go

codecov-commenter · 2022-04-26T11:12:20Z

Codecov Report

Merging #1283 (35f71cf) into main (bd08650) will increase coverage by 0.00%.
The diff coverage is 93.87%.

@@           Coverage Diff           @@
##             main    #1283   +/-   ##
=======================================
  Coverage   80.27%   80.28%           
=======================================
  Files         166      166           
  Lines       12023    12044   +21     
=======================================
+ Hits         9652     9670   +18     
- Misses       1916     1918    +2     
- Partials      455      456    +1

Impacted Files	Coverage Δ
modules/core/keeper/msg_server.go	`58.29% <75.00%> (+0.09%)`	⬆️
modules/apps/29-fee/ibc_middleware.go	`93.75% <92.85%> (-1.43%)`	⬇️
...7-interchain-accounts/controller/ibc_middleware.go	`87.03% <100.00%> (+0.49%)`	⬆️
...les/apps/27-interchain-accounts/host/ibc_module.go	`100.00% <100.00%> (ø)`
modules/apps/transfer/ibc_module.go	`63.88% <100.00%> (+0.76%)`	⬆️

seantking · 2022-04-26T11:16:13Z

modules/apps/transfer/ibc_module.go

+		return "", err
+	}
+
+	if strings.TrimSpace(version) == "" {


I can add a test case for this

modules/apps/27-interchain-accounts/controller/ibc_module.go

modules/apps/27-interchain-accounts/controller/ibc_module_test.go

modules/apps/29-fee/ibc_module.go

modules/apps/transfer/ibc_module_test.go

…anOpenInit

Co-authored-by: colin axnér <[email protected]>

seantking · 2022-04-27T08:28:40Z

CHANGELOG.md

@@ -43,6 +43,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### API Breaking

 * (transfer) [\#1250](https://github.com/cosmos/ibc-go/pull/1250) Deprecate `GetTransferAccount` since the `transfer` module account is never used.
+* (channel) [\#1283](https://github.com/cosmos/ibc-go/pull/1283) `OnChanOpenInit` now returns a version string in line with the latest [spec changes](https://github.com/cosmos/ibc/pull/629).  


Open to improvements on the changelog message.

crodriguezvega

Nice work, @seantking!

I just noticed that in ICA we don't use any types.Version like we have for transfer (ics20-1) or fee. Was there a reason not use one there?

crodriguezvega · 2022-04-27T08:25:30Z

modules/apps/29-fee/ibc_module.go

 	}

 	im.keeper.SetFeeEnabled(ctx, portID, channelID)

 	// call underlying app's OnChanOpenInit callback with the appVersion
-	return im.app.OnChanOpenInit(ctx, order, connectionHops, portID, channelID,
-		chanCap, counterparty, versionMetadata.AppVersion)
+	return string(versionBytes), nil


Why was the call to underlying app's OnChanOpenInit removed here?

Its moved to above on line 53 so that the returned application version (for example: ics20-1) can be inserted into the AppVersion field of types.Metadata, and re-marshalled to a JSON encoded version string. Otherwise we would return directly from the app callback (writing ics20-1 as the channel version into state), we would expect ics29 to be enabled but subsequent handshake callbacks on would fail as the channel version in state would not be the metadata object:

{ "AppVersion": "ics20-1", "FeeVersion": "ics29-1", }

Does that make sense?

crodriguezvega · 2022-04-27T08:37:12Z

modules/apps/transfer/ibc_module_test.go

+			"empty version string", func() {
+				channel.Version = ""
+			}, true,
+		},


Can you also add a test case when channel.Version is not empty but it's a string that does not match the expected types.Version?

We have this test case already, no?

oh, sorry. I missed it.

damiannolan

Nice work! LGTM today, my only concern is the ICA auth module handling of the version string and if it should be given the opportunity to modify it, my initial thinking is no.
Other than that just some minor nits

damiannolan · 2022-04-27T08:59:49Z

CHANGELOG.md

@@ -43,6 +43,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### API Breaking

 * (transfer) [\#1250](https://github.com/cosmos/ibc-go/pull/1250) Deprecate `GetTransferAccount` since the `transfer` module account is never used.
+* (channel) [\#1283](https://github.com/cosmos/ibc-go/pull/1283) `OnChanOpenInit` now returns a version string in line with the latest [spec changes](https://github.com/cosmos/ibc/pull/629).  


Some sugar coating?

Suggested change

* (channel) [\#1283](https://github.com/cosmos/ibc-go/pull/1283) `OnChanOpenInit` now returns a version string in line with the latest [spec changes](https://github.com/cosmos/ibc/pull/629).

* (channel) [\#1283](https://github.com/cosmos/ibc-go/pull/1283) The `OnChanOpenInit` application callback now supports version selection and returns a version string in line with the latest [spec changes](https://github.com/cosmos/ibc/pull/629).

Added the first part but left out the version selection. I found that term confusing personally.

damiannolan · 2022-04-27T09:09:25Z

modules/apps/27-interchain-accounts/controller/ibc_module.go

+	// call underlying app's OnChanOpenInit callback with the passed in version
 	return im.app.OnChanOpenInit(ctx, order, connectionHops, portID, channelID,
 		chanCap, counterparty, version)


This gives an opportunity to the interchain accounts auth module to modify the version string, or perhaps mistakenly return the incorrect string, right?

Is this something we want to support? i.e. providing the auth module the ability to mutate this?
Currently the only expectation from this callback is the claiming of the channel capability.

The code below would complain about appVersion declared but not used...

Suggested change

// call underlying app's OnChanOpenInit callback with the passed in version

return im.app.OnChanOpenInit(ctx, order, connectionHops, portID, channelID,

chanCap, counterparty, version)

// call underlying app's OnChanOpenInit callback with the passed in version

appVersion, err := im.app.OnChanOpenInit(ctx, order, connectionHops, portID, channelID,

chanCap, counterparty, version)

if err != nil {

return "", err

}

return version, nil

Not really following your point with the code example.

What would be the alternative here?

Agreed if ibc-auth is expected not to change the version at all. Then we should ignore it's return value. And if relayer passes in empty string, then just return our default version

Sorry if that was confusing, like @AdityaSripal says, we should ignore the appVersion field from the code example above by discarding it, as we don't want to depend on ica-auth to return the correct string(version) or risk modifying it:

_, err := im.app.OnChanOpenInit(ctx, order, connectionHops, portID, channelID, chanCap, counterparty version) if err != nil { return "", err }

And if relayer passes in empty string, then just return our default version

But for ICA a relayer is never expected to initiate the channel handshake, it should be from some on-chain mechanism, correct?

But for ICA a relayer is never expected to initiate the channel handshake, it should be from some on-chain mechanism, correct?

In our implementation of the controller module, yes. The version string will always be the Metadata struct

Updated this. Good catch 👍

damiannolan · 2022-04-27T09:11:28Z

modules/apps/27-interchain-accounts/controller/ibc_module_test.go

 				path.EndpointA.ChannelConfig.PortID, path.EndpointA.ChannelID, chanCap, channel.Counterparty, channel.GetVersion(),
 			)

 			if tc.expPass {
+				expMetaData := icatypes.NewMetadata(


minor nit: casing

Suggested change

expMetaData := icatypes.NewMetadata(

expMetadata := icatypes.NewMetadata(

damiannolan · 2022-04-27T09:17:12Z

modules/apps/29-fee/ibc_module.go

 	}

 	im.keeper.SetFeeEnabled(ctx, portID, channelID)

 	// call underlying app's OnChanOpenInit callback with the appVersion
-	return im.app.OnChanOpenInit(ctx, order, connectionHops, portID, channelID,
-		chanCap, counterparty, versionMetadata.AppVersion)
+	return string(versionBytes), nil


Its moved to above on line 53 so that the returned application version (for example: ics20-1) can be inserted into the AppVersion field of types.Metadata, and re-marshalled to a JSON encoded version string. Otherwise we would return directly from the app callback (writing ics20-1 as the channel version into state), we would expect ics29 to be enabled but subsequent handshake callbacks on would fail as the channel version in state would not be the metadata object:

{ "AppVersion": "ics20-1", "FeeVersion": "ics29-1", }

Does that make sense?

modules/apps/29-fee/ibc_module.go

damiannolan · 2022-04-27T09:19:54Z

modules/apps/29-fee/ibc_module_test.go

+				} else {
+					suite.Require().Equal(version, ibcmock.Version)
+				}
+
 				suite.Require().NoError(err, "unexpected error from version: %s", tc.version)
 			} else {
 				suite.Require().Error(err, "error not returned for version: %s", tc.version)


Could we also assert version is empty here too?

damiannolan · 2022-04-27T09:20:16Z

modules/apps/transfer/ibc_module_test.go

 				path.EndpointA.ChannelConfig.PortID, path.EndpointA.ChannelID, chanCap, counterparty, channel.GetVersion(),
 			)

 			if tc.expPass {
 				suite.Require().NoError(err)
+				suite.Require().Equal(types.Version, version)
 			} else {
 				suite.Require().Error(err)


ditto on empty version assertion

AdityaSripal

Looks good so far. The default version logic you have in transfer should be extended to the other applications

AdityaSripal · 2022-04-27T10:35:04Z

CHANGELOG.md

@@ -43,6 +43,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### API Breaking

 * (transfer) [\#1250](https://github.com/cosmos/ibc-go/pull/1250) Deprecate `GetTransferAccount` since the `transfer` module account is never used.
+* (channel) [\#1283](https://github.com/cosmos/ibc-go/pull/1283) `OnChanOpenInit` now returns a version string in line with the latest [spec changes](https://github.com/cosmos/ibc/pull/629).  


I would add that it may return a default version string if relayers pass in empty version

I left this out as I don't think the default is applicable to all modules.

Hence the word may, i think it could still be useful but maybe we want to leave that suggestion elsewhere (e.g. release notes or something)

AdityaSripal · 2022-04-27T10:39:04Z

modules/apps/transfer/ibc_module.go

+		return "", err
+	}
+
+	if strings.TrimSpace(version) == "" {


Shouldn't all of the applications/middleware have a similar code block?

responded below

AdityaSripal · 2022-04-27T10:41:41Z

modules/apps/29-fee/ibc_module.go

@@ -36,7 +36,7 @@ func (im IBCModule) OnChanOpenInit(
 	chanCap *capabilitytypes.Capability,
 	counterparty channeltypes.Counterparty,
 	version string,
-) error {
+) (string, error) {
 	var versionMetadata types.Metadata
 	if err := types.ModuleCdc.UnmarshalJSON([]byte(version), &versionMetadata); err != nil {


This will not enable fee by default. If provided string is empty then, get default version from underlying app and wrap with fee version.
If underlying app returns error with empty version then return error as well

Do we want to enable fees by default? Otherwise there's no way to only use the default version of the base application. I'd think middleware applications must be explicitly activated or, the versionMetadata should be specified with an empty fee version

Yes, this was my assumption also. What is the benefit of enabling the fee middleware by default with an empty version passed in?

I do think fees should be enabled by default. My preference is that relayers get the default version of the stack if they don't explicitly specify otherwise. Some middleware will want to be activated by default and some may want to be explicitly activated. For adoption purposes, I think it would be good to make incentivization the default rather than having to explicitly enable it. Because as I think the number of applications scale, most relayers will only be passing in empty strings and use non-empty strings only in very special cases (otherwise they would need to have context on every single port they relay for).

So a relayer that always defaults to what the application prefers will be opening incentivized channels.

Of course, if the relayer wants to explicitly disable fees then they can by passing in a version without the feeVersion. But we should design for a future where relayers are rarely passing in specific strings

Sounds good to me. In favor of @AdityaSripal's approach. It should just be well documented that ics29 is an exceptional middleware application that we believe should be enabled by default, but that other applications (who might be copy/pasting our code) should give good consideration to whether their application should be enabled by default

Thanks for the explanation @AdityaSripal. Makes sense to me!

AdityaSripal · 2022-04-27T10:44:27Z

modules/apps/27-interchain-accounts/controller/ibc_module.go

+	// call underlying app's OnChanOpenInit callback with the passed in version
 	return im.app.OnChanOpenInit(ctx, order, connectionHops, portID, channelID,
 		chanCap, counterparty, version)


Agreed if ibc-auth is expected not to change the version at all. Then we should ignore it's return value. And if relayer passes in empty string, then just return our default version

seantking · 2022-04-27T15:59:43Z

Looks good so far. The default version logic you have in transfer should be extended to the other applications

I left the default only for ics20.

I think ics29 should not be enabled by default as @colin-axner suggests & relayers do not pass a version for ics-27. The controller for ics27 module always passes a metaData struct as a version to the OnChanOpenInit callback, it's not optional.

seantking · 2022-04-27T16:01:48Z

Nice work, @seantking!

I just noticed that in ICA we don't use any types.Version like we have for transfer (ics20-1) or fee. Was there a reason not use one there?

Here :)

damiannolan · 2022-04-28T08:00:33Z

modules/apps/27-interchain-accounts/controller/ibc_module.go

+	// call underlying app's OnChanOpenInit callback with the passed in version
+	if _, err := im.app.OnChanOpenInit(ctx, order, connectionHops, portID, channelID, chanCap, counterparty, version); err != nil {
+		return "", err
 	}


Could be useful to have a small explanation of why this is ignored in the comment.

modules/apps/transfer/ibc_module_test.go

…re stack

colin-axner

Nice work! LGTM!

CHANGELOG.md

modules/apps/27-interchain-accounts/controller/ibc_middleware.go

AdityaSripal

Some testing and documentation nits :)

Would appreciate having them fixed, but doesn't need to happen in this PR

AdityaSripal · 2022-05-04T11:21:47Z

modules/apps/29-fee/ibc_middleware_test.go

+				isFeeEnabled := suite.chainA.GetSimApp().IBCFeeKeeper.IsFeeEnabled(suite.chainA.GetContext(), suite.path.EndpointA.ChannelConfig.PortID, suite.path.EndpointA.ChannelID)
+				if isFeeEnabled {


This is a strange way to test here because you're relying on the result of the callback execution to create your expected value. If the callback incorrectly creates a fee version and incorrectly sets fee enabled you won't catch it here. Similarly if the callback incorrectly doesn't set fee version and incorrectly doesn't set fee enabled you won't catch it.

I think we should add a boolean in the test cases that says feeEnabled. You then can add the expected value for each test case and then check if the feeEnabled flag is true and check if the version contains a fee version

Yup good catch. Thanks for the feedback 🤝

AdityaSripal · 2022-05-04T11:23:51Z

modules/core/05-port/types/module.go

+	// If the provided version string is non-empty, OnChanOpenInit should return
+	// the version string if valid or an error if the provided version is invalid.


Do we require that Init returns the exact same version if version is non-empty? I don't believe that is the case. Applications may want to modify the version string even if it is non-empty

I took this directly from the spec: https://github.com/cosmos/ibc/pull/629/files#diff-508b3e7784a300436fbeb6940be22f31c74e958270a36bb851d06a8782ad7e7aR50

Should we update both? Agree with your assessment.

Yes I agree we should change the spec as well

AdityaSripal

Nice work! Thanks @seantking

Fixes cosmos#1283  ## Summary by CodeRabbit Refactor: - Improvement: Enhanced the transaction handling process in the `TxMempool` module. Transactions are now more accurately filtered based on their gas and data size limits, ensuring that only valid transactions are processed. This update improves the overall efficiency and reliability of transaction processing. Tests: - Test: Added a new test, `TestTxMempoolTxLargerThanMaxBytes`, to verify the correct handling of large transactions. This ensures the robustness of the system when dealing with transactions of varying sizes.  --------- Co-authored-by: Ganesha Upadhyaya <[email protected]>

seantking added 2 commits April 21, 2022 16:27

refactor: returning version from OnChanOpenInit

5b0bc50

refactor: update tests and add version to proto resp

b7088f8

seantking changed the title ~~refactor: channel handshake improvements~~ refactor: channel handshake version improvements Apr 21, 2022

refactor: adding version to msg server resp

6f20ad9

seantking commented Apr 21, 2022

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colin-axner reviewed Apr 21, 2022

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seantking added 3 commits April 26, 2022 12:17

refactor: remove unncessary if & update version on Endpoint.Ack

31a2831

fix: ics29 OnChanOpenInit remake versionMetaData before returning

0178c09

chore: update godoc

8f8ce78

seantking marked this pull request as ready for review April 26, 2022 11:00

seantking requested review from AdityaSripal, damiannolan, fedekunze, crodriguezvega and charleenfei as code owners April 26, 2022 11:00

Merge branch 'main' into sean/issue#722-channel-handshake-improvements

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seantking and others added 5 commits April 26, 2022 19:21

test: adding check for expected version string

2b0cca4

test: adding test case for passing empty version string to ics20 onCh…

2d7f0b8

…anOpenInit

Update modules/apps/29-fee/ibc_module.go

534e00c

Co-authored-by: colin axnér <[email protected]>

chore: comment

8f08760

Merge branch 'main' into sean/issue#722-channel-handshake-improvements

7d6246c

seantking requested a review from colin-axner April 26, 2022 17:29

seantking and others added 2 commits April 27, 2022 10:27

chore: changelog

a03916d

Merge branch 'main' into sean/issue#722-channel-handshake-improvements

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seantking added 2 commits April 27, 2022 17:57

fix: ica now discards auth module version

ce656c4

chore: update changelog

092d3fe

seantking requested review from damiannolan, crodriguezvega and AdityaSripal April 27, 2022 16:02

damiannolan approved these changes Apr 28, 2022

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adding default version for ics29

d30f887

seantking force-pushed the sean/issue#722-channel-handshake-improvements branch from 2f640f3 to d30f887 Compare April 29, 2022 16:42

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fix: using transfer module directly rather than calling full middlewa…

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…re stack

fix testing bug

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seantking added 2 commits May 4, 2022 15:54

refactor: test now uses bool for isFeeEnabled rather than direct check

0b85196

docs: updating comment and migration docs

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seantking enabled auto-merge (squash) May 10, 2022 15:19

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crodriguezvega mentioned this pull request May 16, 2022

Bump package to v4 #1359

Closed

crodriguezvega mentioned this pull request Jun 26, 2022

docs: document that version string can be empty in RegisterInterchainAccount #1582

Merged

9 tasks

	* (channel) [\#1283](https://github.com/cosmos/ibc-go/pull/1283) `OnChanOpenInit` now returns a version string in line with the latest [spec changes](https://github.com/cosmos/ibc/pull/629).
	* (channel) [\#1283](https://github.com/cosmos/ibc-go/pull/1283) The `OnChanOpenInit` application callback now supports version selection and returns a version string in line with the latest [spec changes](https://github.com/cosmos/ibc/pull/629).

	expMetaData := icatypes.NewMetadata(
	expMetadata := icatypes.NewMetadata(

		isFeeEnabled := suite.chainA.GetSimApp().IBCFeeKeeper.IsFeeEnabled(suite.chainA.GetContext(), suite.path.EndpointA.ChannelConfig.PortID, suite.path.EndpointA.ChannelID)
		if isFeeEnabled {

		// If the provided version string is non-empty, OnChanOpenInit should return
		// the version string if valid or an error if the provided version is invalid.

refactor: channel handshake version improvements #1283

refactor: channel handshake version improvements #1283

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