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utils.go
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utils.go
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package core
import (
"encoding/hex"
"fmt"
"strconv"
"strings"
abci "github.com/cometbft/cometbft/abci/types"
clienttypes "github.com/cosmos/ibc-go/v7/modules/core/02-client/types"
channeltypes "github.com/cosmos/ibc-go/v7/modules/core/04-channel/types"
)
func GetPacketsFromEvents(events []abci.Event, eventType string) ([]channeltypes.Packet, error) {
var packets []channeltypes.Packet
for _, ev := range events {
if ev.Type != eventType {
continue
}
// NOTE: Attributes of packet are included in one event.
var (
packet channeltypes.Packet
err error
)
for i, attr := range ev.Attributes {
v := string(attr.Value)
switch string(attr.Key) {
case channeltypes.AttributeKeyData:
// AttributeKeyData key indicates a start of packet attributes
packet = channeltypes.Packet{}
packet.Data = []byte(attr.Value)
err = assertIndex(i, 0)
case channeltypes.AttributeKeyDataHex:
var bz []byte
bz, err = hex.DecodeString(attr.Value)
if err != nil {
panic(err)
}
packet.Data = bz
err = assertIndex(i, 1)
case channeltypes.AttributeKeyTimeoutHeight:
parts := strings.Split(v, "-")
packet.TimeoutHeight = clienttypes.NewHeight(
strToUint64(parts[0]),
strToUint64(parts[1]),
)
err = assertIndex(i, 2)
case channeltypes.AttributeKeyTimeoutTimestamp:
packet.TimeoutTimestamp = strToUint64(v)
err = assertIndex(i, 3)
case channeltypes.AttributeKeySequence:
packet.Sequence = strToUint64(v)
err = assertIndex(i, 4)
case channeltypes.AttributeKeySrcPort:
packet.SourcePort = v
err = assertIndex(i, 5)
case channeltypes.AttributeKeySrcChannel:
packet.SourceChannel = v
err = assertIndex(i, 6)
case channeltypes.AttributeKeyDstPort:
packet.DestinationPort = v
err = assertIndex(i, 7)
case channeltypes.AttributeKeyDstChannel:
packet.DestinationChannel = v
err = assertIndex(i, 8)
}
if err != nil {
return nil, err
}
}
if err := packet.ValidateBasic(); err != nil {
return nil, err
}
packets = append(packets, packet)
}
return packets, nil
}
func FindPacketFromEventsBySequence(events []abci.Event, eventType string, seq uint64) (*channeltypes.Packet, error) {
packets, err := GetPacketsFromEvents(events, eventType)
if err != nil {
return nil, err
}
for _, packet := range packets {
if packet.Sequence == seq {
return &packet, nil
}
}
return nil, nil
}
type packetAcknowledgement struct {
srcPortID string
srcChannelID string
dstPortID string
dstChannelID string
sequence uint64
data []byte
}
func (ack packetAcknowledgement) Data() []byte {
return ack.data
}
func GetPacketAcknowledgementsFromEvents(events []abci.Event) ([]packetAcknowledgement, error) {
var acks []packetAcknowledgement
for _, ev := range events {
if ev.Type != channeltypes.EventTypeWriteAck {
continue
}
var (
ack packetAcknowledgement
err error
)
for i, attr := range ev.Attributes {
v := string(attr.Value)
switch string(attr.Key) {
case channeltypes.AttributeKeySequence:
ack.sequence = strToUint64(v)
err = assertIndex(i, 4)
case channeltypes.AttributeKeySrcPort:
ack.srcPortID = v
err = assertIndex(i, 5)
case channeltypes.AttributeKeySrcChannel:
ack.srcChannelID = v
err = assertIndex(i, 6)
case channeltypes.AttributeKeyDstPort:
ack.dstPortID = v
err = assertIndex(i, 7)
case channeltypes.AttributeKeyDstChannel:
ack.dstChannelID = v
err = assertIndex(i, 8)
case channeltypes.AttributeKeyAck:
ack.data = []byte(attr.Value)
err = assertIndex(i, 9)
}
if err != nil {
return nil, err
}
}
acks = append(acks, ack)
}
return acks, nil
}
func FindPacketAcknowledgementFromEventsBySequence(events []abci.Event, seq uint64) (*packetAcknowledgement, error) {
acks, err := GetPacketAcknowledgementsFromEvents(events)
if err != nil {
return nil, err
}
for _, ack := range acks {
if ack.sequence == seq {
return &ack, nil
}
}
return nil, nil
}
func assertIndex(actual, expected int) error {
if actual == expected {
return nil
} else {
return fmt.Errorf("assertion error: %v != %v", actual, expected)
}
}
func strToUint64(s string) uint64 {
v, err := strconv.ParseUint(s, 10, 64)
if err != nil {
panic(err)
}
return uint64(v)
}