synapsecns/sanguine

package cctp

import (
    "bytes"
    "strings"

    "github.com/ethereum/go-ethereum/accounts/abi"
    "github.com/ethereum/go-ethereum/common"
    "github.com/synapsecns/sanguine/services/explorer/types/cctp"
)

func init() {
    var err error
    parsedCCTPEvent, err := abi.JSON(strings.NewReader(SynapseCCTPMetaData.ABI))
    if err != nil {
        panic(err)
    }

    CircleRequestSentTopic = parsedCCTPEvent.Events["CircleRequestSent"].ID

    CircleRequestFulfilledTopic = parsedCCTPEvent.Events["CircleRequestFulfilled"].ID
}

// CircleRequestSentTopic is when a Circle token is sent with an attached action request.
var CircleRequestSentTopic common.Hash

// CircleRequestFulfilledTopic is when a Circle token is received with an attached action request.
var CircleRequestFulfilledTopic common.Hash

// TopicMap maps events to topics.
// this is returned as a function to assert immutability.
func TopicMap() map[cctp.EventType]common.Hash {
    return map[cctp.EventType]common.Hash{
        cctp.CircleRequestSentEvent:      CircleRequestSentTopic,
        cctp.CircleRequestFulfilledEvent: CircleRequestFulfilledTopic,
    }
}

// EventTypeFromTopic gets the event type from the topic
// returns nil if the topic is not found.
func EventTypeFromTopic(ogTopic common.Hash) *cctp.EventType {
    for eventType, topic := range TopicMap() {
        if bytes.Equal(ogTopic.Bytes(), topic.Bytes()) {
            return &eventType
        }
    }
    return nil
}

// Topic gets the topic from the event type.
func Topic(eventType cctp.EventType) common.Hash {
    topicHash, ok := TopicMap()[cctp.EventType(eventType.Int())]
    if !ok {
        panic("unknown event")
    }
    return topicHash
}