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imp: simplified BuildMerklePath #7863

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merged 4 commits into from
Jan 23, 2025
Merged

imp: simplified BuildMerklePath #7863

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3d2d4c9
imp: simplified BuildMerklePath
srdtrk Jan 21, 2025
c072134
imp: review item
srdtrk Jan 21, 2025
9444463
test: improved test structure
srdtrk Jan 21, 2025
e4ee0dd
Merge branch 'feat/ibc-eureka' into serdar/7642-fix-build-mp
srdtrk Jan 23, 2025
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10 changes: 3 additions & 7 deletions modules/core/04-channel/v2/keeper/packet.go
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,6 @@ import (

clienttypes "github.com/cosmos/ibc-go/v9/modules/core/02-client/types"
"github.com/cosmos/ibc-go/v9/modules/core/04-channel/v2/types"
commitmenttypes "github.com/cosmos/ibc-go/v9/modules/core/23-commitment/types"
hostv2 "github.com/cosmos/ibc-go/v9/modules/core/24-host/v2"
"github.com/cosmos/ibc-go/v9/modules/core/exported"
)
Expand Down Expand Up @@ -121,8 +120,7 @@ func (k *Keeper) recvPacket(
}

path := hostv2.PacketCommitmentKey(packet.SourceClient, packet.Sequence)
merklePrefix := commitmenttypes.NewMerklePath(counterparty.MerklePrefix...)
merklePath := types.BuildMerklePath(merklePrefix, path)
merklePath := types.BuildMerklePath(counterparty.MerklePrefix, path)

commitment := types.CommitPacket(packet)

Expand Down Expand Up @@ -219,8 +217,7 @@ func (k *Keeper) acknowledgePacket(ctx context.Context, packet types.Packet, ack
}

path := hostv2.PacketAcknowledgementKey(packet.DestinationClient, packet.Sequence)
merklePrefix := commitmenttypes.NewMerklePath(counterparty.MerklePrefix...)
merklePath := types.BuildMerklePath(merklePrefix, path)
merklePath := types.BuildMerklePath(counterparty.MerklePrefix, path)

if err := k.ClientKeeper.VerifyMembership(
ctx,
Expand Down Expand Up @@ -298,8 +295,7 @@ func (k *Keeper) timeoutPacket(

// verify packet receipt absence
path := hostv2.PacketReceiptKey(packet.DestinationClient, packet.Sequence)
merklePrefix := commitmenttypes.NewMerklePath(counterparty.MerklePrefix...)
merklePath := types.BuildMerklePath(merklePrefix, path)
merklePath := types.BuildMerklePath(counterparty.MerklePrefix, path)

if err := k.ClientKeeper.VerifyNonMembership(
ctx,
Expand Down
27 changes: 8 additions & 19 deletions modules/core/04-channel/v2/types/merkle.go
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@@ -1,31 +1,20 @@
package types

import (
commitmenttypes "github.com/cosmos/ibc-go/v9/modules/core/23-commitment/types"
commitmenttypesv2 "github.com/cosmos/ibc-go/v9/modules/core/23-commitment/types/v2"
)

// BuildMerklePath takes the merkle path prefix and an ICS24 path
// and builds a new path by appending the ICS24 path to the last element of the merkle path prefix.
func BuildMerklePath(prefix commitmenttypesv2.MerklePath, path []byte) commitmenttypesv2.MerklePath {
if prefix.Empty() {
return commitmenttypes.NewMerklePath(path)
func BuildMerklePath(prefix [][]byte, path []byte) commitmenttypesv2.MerklePath {
prefixLength := len(prefix)
if prefixLength == 0 {
panic("cannot build merkle path with empty prefix")
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Don't think this should necessarily error. If there's no prefix, the path should just be returned as it was originally. See removed diff

This would be equivalent to a chain storing the ICS24 paths directly under root. Which is potentially possible for a solomachine chain or something equivalent

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What is the reasoning for changing the behavior here?

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Ahh i see it was decided in the original issue! Ok, i mean i suppose we could require all implementations to store under a prefix

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I don't remember the entire context for why we said this, but it was something we mentioned during the alpha audit itself, I believe.

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I could take this back. I don't feel strongly about it. What should we do?

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@AdityaSripal can have the final say on it :)

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I think its more likely that someone accidentally leaves prefix empty than having a counterparty that is genuinely storing everything under root.

So lets have the error for now, and if we ever have a user run into this issue and report it we can change the behavior of this function quite easily

}

// avoid mutating the provided prefix
prefixKeys := make([][]byte, len(prefix.KeyPath))
copy(prefixKeys, prefix.KeyPath)

lastElement := prefixKeys[len(prefixKeys)-1]
// copy prefix to avoid modifying the original slice
fullPath := append([][]byte(nil), prefix...)
// append path to last element
newLastElement := cloneAppend(lastElement, path)
prefixKeys[len(prefixKeys)-1] = newLastElement
return commitmenttypes.NewMerklePath(prefixKeys...)
}

func cloneAppend(bz []byte, tail []byte) []byte {
res := make([]byte, len(bz)+len(tail))
copy(res, bz)
copy(res[len(bz):], tail)
return res
fullPath[prefixLength-1] = append(fullPath[prefixLength-1], path...)
return commitmenttypesv2.NewMerklePath(fullPath...)
}
35 changes: 21 additions & 14 deletions modules/core/04-channel/v2/types/merkle_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,6 @@ package types_test

import (
"github.com/cosmos/ibc-go/v9/modules/core/04-channel/v2/types"
commitmenttypes "github.com/cosmos/ibc-go/v9/modules/core/23-commitment/types"
commitmenttypesv2 "github.com/cosmos/ibc-go/v9/modules/core/23-commitment/types/v2"
host "github.com/cosmos/ibc-go/v9/modules/core/24-host"
ibctesting "github.com/cosmos/ibc-go/v9/testing"
Expand All @@ -12,14 +11,16 @@ func (s *TypesTestSuite) TestBuildMerklePath() {
path := ibctesting.NewPath(s.chainA, s.chainB)
path.SetupV2()

prefixPath := commitmenttypes.NewMerklePath([]byte("ibc"), []byte(""))
prefixPath := [][]byte{[]byte("ibc"), []byte("")}
packetCommitmentKey := host.PacketCommitmentKey(path.EndpointA.ChannelConfig.PortID, path.EndpointA.ChannelID, 1)
emptyPrefixPanicMsg := "cannot build merkle path with empty prefix"

testCases := []struct {
name string
prefix commitmenttypesv2.MerklePath
path []byte
expPath commitmenttypesv2.MerklePath
name string
prefix [][]byte
path []byte
expPath commitmenttypesv2.MerklePath
expPanics *string
}{
{
name: "standard ibc path",
Expand All @@ -29,21 +30,21 @@ func (s *TypesTestSuite) TestBuildMerklePath() {
},
{
name: "non-empty last element prefix path",
prefix: commitmenttypes.NewMerklePath([]byte("ibc"), []byte("abc")),
prefix: [][]byte{[]byte("ibc"), []byte("abc")},
path: packetCommitmentKey,
expPath: commitmenttypesv2.NewMerklePath([]byte("ibc"), append([]byte("abc"), packetCommitmentKey...)),
},
{
name: "many elements in prefix path",
prefix: commitmenttypes.NewMerklePath([]byte("ibc"), []byte("a"), []byte("b"), []byte("c"), []byte("d")),
prefix: [][]byte{[]byte("ibc"), []byte("a"), []byte("b"), []byte("c"), []byte("d")},
path: packetCommitmentKey,
expPath: commitmenttypesv2.NewMerklePath([]byte("ibc"), []byte("a"), []byte("b"), []byte("c"), append([]byte("d"), packetCommitmentKey...)),
},
{
name: "empty prefix",
prefix: commitmenttypesv2.MerklePath{},
path: packetCommitmentKey,
expPath: commitmenttypesv2.NewMerklePath(packetCommitmentKey),
name: "empty prefix",
prefix: [][]byte{},
path: packetCommitmentKey,
expPanics: &emptyPrefixPanicMsg,
},
{
name: "empty path",
Expand All @@ -57,8 +58,14 @@ func (s *TypesTestSuite) TestBuildMerklePath() {
tc := tc

s.Run(tc.name, func() {
merklePath := types.BuildMerklePath(tc.prefix, tc.path)
s.Require().Equal(tc.expPath, merklePath)
if tc.expPanics == nil {
merklePath := types.BuildMerklePath(tc.prefix, tc.path)
s.Require().Equal(tc.expPath, merklePath)
} else {
s.Require().PanicsWithValue(*tc.expPanics, func() {
_ = types.BuildMerklePath(tc.prefix, tc.path)
})
}
})
}
}
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