synapsecns/sanguine

package inbox

import (
    "fmt"

    "github.com/ethereum/go-ethereum/common"
    ethTypes "github.com/ethereum/go-ethereum/core/types"
    "github.com/synapsecns/sanguine/agents/types"
)

// Parser parses events from the inbox contract.
type Parser interface {
    // EventType is the event type.
    EventType(log ethTypes.Log) (_ EventType, ok bool)
    // ParseSnapshotAccepted parses a SnapshotAccepted event.
    ParseSnapshotAccepted(log ethTypes.Log) (_ *types.SnapshotWithMetadata, err error)
    // ParseReceiptAccepted parses a ReceiptAccepted event.
    ParseReceiptAccepted(log ethTypes.Log) (_ *InboxReceiptAccepted, err error)
}

type parserImpl struct {
    // filterer is the parser filterer we use to parse events
    filterer *InboxFilterer
}

// NewParser creates a new parser for the inbox contract.
func NewParser(inboxAddress common.Address) (Parser, error) {
    parser, err := NewInboxFilterer(inboxAddress, nil)
    if err != nil {
        return nil, fmt.Errorf("could not create %T: %w", InboxFilterer{}, err)
    }

    return &parserImpl{filterer: parser}, nil
}

func (p parserImpl) EventType(log ethTypes.Log) (_ EventType, ok bool) {
    for _, logTopic := range log.Topics {
        eventType := eventTypeFromTopic(logTopic)
        if eventType == nil {
            continue
        }

        return *eventType, true
    }
    // return an unknown event to avoid cases where user failed to check the event type
    return EventType(len(AllEventTypes) + 2), false
}

// ParseSnapshotAccepted parses a SnapshotAccepted event.
func (p parserImpl) ParseSnapshotAccepted(log ethTypes.Log) (_ *types.SnapshotWithMetadata, err error) {
    inboxSnapshot, err := p.filterer.ParseSnapshotAccepted(log)
    if err != nil {
        return nil, fmt.Errorf("could not parse snapshot accepted event: %w", err)
    }

    snapshotData, err := types.NewSnapshotWithMetadata(inboxSnapshot.SnapPayload, inboxSnapshot.Domain, inboxSnapshot.Agent, inboxSnapshot.SnapSignature)
    if err != nil {
        return nil, fmt.Errorf("could not create fraud snapshot from payload: %w", err)
    }

    return snapshotData, nil
}

// ParseReceiptAccepted parses a ReceiptAccepted event.
func (p parserImpl) ParseReceiptAccepted(log ethTypes.Log) (_ *InboxReceiptAccepted, err error) {
    inboxReceipt, err := p.filterer.ParseReceiptAccepted(log)
    if err != nil {
        return nil, fmt.Errorf("could not parse snapshot accepted event: %w", err)
    }

    return inboxReceipt, nil
}

// EventType is the type of the summit events
//
//go:generate go run golang.org/x/tools/cmd/stringer -type=EventType
type EventType uint

const (
    // SnapshotAcceptedEvent is a SnapshotAccepted event.
    SnapshotAcceptedEvent EventType = iota
    // ReceiptAcceptedEvent is a ReceiptAccepted event.
    ReceiptAcceptedEvent
)

// Int gets the int for an event type.
func (i EventType) Int() uint8 {
    return uint8(i)
}

// AllEventTypes contains all event types.
var AllEventTypes = []EventType{SnapshotAcceptedEvent, ReceiptAcceptedEvent}