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chore: add ParsePacketFromEvents testing helper function (backport #904) #919

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Feb 15, 2022
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chore: add ParsePacketFromEvents testing helper function (backport #904) #919

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1 change: 1 addition & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,7 @@ Ref: https://keepachangelog.com/en/1.0.0/

### Improvements

* (testing) [\#904](https://github.com/cosmos/ibc-go/pull/904) Add `ParsePacketFromEvents` function to the testing package. Useful when sending/relaying packets via the testing package.
* (testing) [\#893](https://github.com/cosmos/ibc-go/pull/893) Support custom private keys for testing.
* (testing) [\#810](https://github.com/cosmos/ibc-go/pull/810) Additional testing function added to `Endpoint` type called `RecvPacketWithResult`. Performs the same functionality as the existing `RecvPacket` function but also returns the message result. `path.RelayPacket` no longer uses the provided acknowledgement argument and instead obtains the acknowledgement via MsgRecvPacket events.
* (connection) [\#721](https://github.com/cosmos/ibc-go/pull/721) Simplify connection handshake error messages when unpacking client state.
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8 changes: 4 additions & 4 deletions modules/apps/transfer/keeper/relay_test.go
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Expand Up @@ -186,12 +186,12 @@ func (suite *KeeperTestSuite) TestOnRecvPacket() {
// send coin from chainB to chainA, receive them, acknowledge them, and send back to chainB
coinFromBToA := sdk.NewCoin(sdk.DefaultBondDenom, sdk.NewInt(100))
transferMsg := types.NewMsgTransfer(path.EndpointB.ChannelConfig.PortID, path.EndpointB.ChannelID, coinFromBToA, suite.chainB.SenderAccount.GetAddress().String(), suite.chainA.SenderAccount.GetAddress().String(), clienttypes.NewHeight(0, 110), 0)
_, err := suite.chainB.SendMsgs(transferMsg)
res, err := suite.chainB.SendMsgs(transferMsg)
suite.Require().NoError(err) // message committed

// relay send packet
fungibleTokenPacket := types.NewFungibleTokenPacketData(coinFromBToA.Denom, coinFromBToA.Amount.String(), suite.chainB.SenderAccount.GetAddress().String(), suite.chainA.SenderAccount.GetAddress().String())
packet := channeltypes.NewPacket(fungibleTokenPacket.GetBytes(), 1, path.EndpointB.ChannelConfig.PortID, path.EndpointB.ChannelID, path.EndpointA.ChannelConfig.PortID, path.EndpointA.ChannelID, clienttypes.NewHeight(0, 110), 0)
packet, err := ibctesting.ParsePacketFromEvents(res.GetEvents())
suite.Require().NoError(err)

err = path.RelayPacket(packet)
suite.Require().NoError(err) // relay committed

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33 changes: 15 additions & 18 deletions modules/apps/transfer/transfer_test.go
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Expand Up @@ -8,7 +8,6 @@ import (

"github.com/cosmos/ibc-go/v3/modules/apps/transfer/types"
clienttypes "github.com/cosmos/ibc-go/v3/modules/core/02-client/types"
channeltypes "github.com/cosmos/ibc-go/v3/modules/core/04-channel/types"
ibctesting "github.com/cosmos/ibc-go/v3/testing"
)

Expand Down Expand Up @@ -56,13 +55,13 @@ func (suite *TransferTestSuite) TestHandleMsgTransfer() {

// send from chainA to chainB
msg := types.NewMsgTransfer(path.EndpointA.ChannelConfig.PortID, path.EndpointA.ChannelID, coinToSendToB, suite.chainA.SenderAccount.GetAddress().String(), suite.chainB.SenderAccount.GetAddress().String(), timeoutHeight, 0)

_, err := suite.chainA.SendMsgs(msg)
res, err := suite.chainA.SendMsgs(msg)
suite.Require().NoError(err) // message committed

packet, err := ibctesting.ParsePacketFromEvents(res.GetEvents())
suite.Require().NoError(err)

// relay send
fungibleTokenPacket := types.NewFungibleTokenPacketData(coinToSendToB.Denom, coinToSendToB.Amount.String(), suite.chainA.SenderAccount.GetAddress().String(), suite.chainB.SenderAccount.GetAddress().String())
packet := channeltypes.NewPacket(fungibleTokenPacket.GetBytes(), 1, path.EndpointA.ChannelConfig.PortID, path.EndpointA.ChannelID, path.EndpointB.ChannelConfig.PortID, path.EndpointB.ChannelID, timeoutHeight, 0)
err = path.RelayPacket(packet)
suite.Require().NoError(err) // relay committed

Expand All @@ -82,18 +81,18 @@ func (suite *TransferTestSuite) TestHandleMsgTransfer() {

// send from chainB to chainC
msg = types.NewMsgTransfer(pathBtoC.EndpointA.ChannelConfig.PortID, pathBtoC.EndpointA.ChannelID, coinSentFromAToB, suite.chainB.SenderAccount.GetAddress().String(), suite.chainC.SenderAccount.GetAddress().String(), timeoutHeight, 0)

_, err = suite.chainB.SendMsgs(msg)
res, err = suite.chainB.SendMsgs(msg)
suite.Require().NoError(err) // message committed

// relay send
// NOTE: fungible token is prefixed with the full trace in order to verify the packet commitment
fullDenomPath := types.GetPrefixedDenom(pathBtoC.EndpointB.ChannelConfig.PortID, pathBtoC.EndpointB.ChannelID, voucherDenomTrace.GetFullDenomPath())
fungibleTokenPacket = types.NewFungibleTokenPacketData(voucherDenomTrace.GetFullDenomPath(), coinSentFromAToB.Amount.String(), suite.chainB.SenderAccount.GetAddress().String(), suite.chainC.SenderAccount.GetAddress().String())
packet = channeltypes.NewPacket(fungibleTokenPacket.GetBytes(), 1, pathBtoC.EndpointA.ChannelConfig.PortID, pathBtoC.EndpointA.ChannelID, pathBtoC.EndpointB.ChannelConfig.PortID, pathBtoC.EndpointB.ChannelID, timeoutHeight, 0)
packet, err = ibctesting.ParsePacketFromEvents(res.GetEvents())
suite.Require().NoError(err)

err = pathBtoC.RelayPacket(packet)
suite.Require().NoError(err) // relay committed

// NOTE: fungible token is prefixed with the full trace in order to verify the packet commitment
fullDenomPath := types.GetPrefixedDenom(pathBtoC.EndpointB.ChannelConfig.PortID, pathBtoC.EndpointB.ChannelID, voucherDenomTrace.GetFullDenomPath())

coinSentFromBToC := sdk.NewCoin(types.ParseDenomTrace(fullDenomPath).IBCDenom(), amount)
balance = suite.chainC.GetSimApp().BankKeeper.GetBalance(suite.chainC.GetContext(), suite.chainC.SenderAccount.GetAddress(), coinSentFromBToC.Denom)

Expand All @@ -106,14 +105,12 @@ func (suite *TransferTestSuite) TestHandleMsgTransfer() {

// send from chainC back to chainB
msg = types.NewMsgTransfer(pathBtoC.EndpointB.ChannelConfig.PortID, pathBtoC.EndpointB.ChannelID, coinSentFromBToC, suite.chainC.SenderAccount.GetAddress().String(), suite.chainB.SenderAccount.GetAddress().String(), timeoutHeight, 0)

_, err = suite.chainC.SendMsgs(msg)
res, err = suite.chainC.SendMsgs(msg)
suite.Require().NoError(err) // message committed

// relay send
// NOTE: fungible token is prefixed with the full trace in order to verify the packet commitment
fungibleTokenPacket = types.NewFungibleTokenPacketData(fullDenomPath, coinSentFromBToC.Amount.String(), suite.chainC.SenderAccount.GetAddress().String(), suite.chainB.SenderAccount.GetAddress().String())
packet = channeltypes.NewPacket(fungibleTokenPacket.GetBytes(), 1, pathBtoC.EndpointB.ChannelConfig.PortID, pathBtoC.EndpointB.ChannelID, pathBtoC.EndpointA.ChannelConfig.PortID, pathBtoC.EndpointA.ChannelID, timeoutHeight, 0)
packet, err = ibctesting.ParsePacketFromEvents(res.GetEvents())
suite.Require().NoError(err)

err = pathBtoC.RelayPacket(packet)
suite.Require().NoError(err) // relay committed

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60 changes: 60 additions & 0 deletions testing/events.go
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Expand Up @@ -2,6 +2,7 @@ package ibctesting

import (
"fmt"
"strconv"

sdk "github.com/cosmos/cosmos-sdk/types"

Expand Down Expand Up @@ -56,6 +57,65 @@ func ParseChannelIDFromEvents(events sdk.Events) (string, error) {
return "", fmt.Errorf("channel identifier event attribute not found")
}

// ParsePacketFromEvents parses events emitted from a MsgRecvPacket and returns the
// acknowledgement.
func ParsePacketFromEvents(events sdk.Events) (channeltypes.Packet, error) {
for _, ev := range events {
if ev.Type == channeltypes.EventTypeSendPacket {
packet := channeltypes.Packet{}
for _, attr := range ev.Attributes {

switch string(attr.Key) {
case channeltypes.AttributeKeyData:
packet.Data = attr.Value

case channeltypes.AttributeKeySequence:
seq, err := strconv.ParseUint(string(attr.Value), 10, 64)
if err != nil {
return channeltypes.Packet{}, err
}

packet.Sequence = seq

case channeltypes.AttributeKeySrcPort:
packet.SourcePort = string(attr.Value)

case channeltypes.AttributeKeySrcChannel:
packet.SourceChannel = string(attr.Value)

case channeltypes.AttributeKeyDstPort:
packet.DestinationPort = string(attr.Value)

case channeltypes.AttributeKeyDstChannel:
packet.DestinationChannel = string(attr.Value)

case channeltypes.AttributeKeyTimeoutHeight:
height, err := clienttypes.ParseHeight(string(attr.Value))
if err != nil {
return channeltypes.Packet{}, err
}

packet.TimeoutHeight = height

case channeltypes.AttributeKeyTimeoutTimestamp:
timestamp, err := strconv.ParseUint(string(attr.Value), 10, 64)
if err != nil {
return channeltypes.Packet{}, err
}

packet.TimeoutTimestamp = timestamp

default:
continue
}
}

return packet, nil
}
}
return channeltypes.Packet{}, fmt.Errorf("acknowledgement event attribute not found")
}

// ParseAckFromEvents parses events emitted from a MsgRecvPacket and returns the
// acknowledgement.
func ParseAckFromEvents(events sdk.Events) ([]byte, error) {
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