package handler import ( "context" "math/big" "github.com/celo-org/celo-blockchain/common" "github.com/grassrootseconomics/celo-tracker/internal/pub" "github.com/grassrootseconomics/celo-tracker/pkg/event" "github.com/grassrootseconomics/w3-celo" ) type tokenBurnHandler struct { pub pub.Pub } const burnEventName = "TOKEN_BURN" var ( tokenBurnTopicHash = w3.H("0xcc16f5dbb4873280815c1ee09dbd06736cffcc184412cf7a71a0fdb75d397ca5") tokenBurnEvent = w3.MustNewEvent("Burn(address indexed _tokenBurner, uint256 _value)") tokenBurnToSig = w3.MustNewFunc("Burn(uint256)", "bool") ) func NewTokenBurnHandler(pub pub.Pub) *tokenBurnHandler { return &tokenBurnHandler{ pub: pub, } } func (h *tokenBurnHandler) Name() string { return burnEventName } func (h *tokenBurnHandler) HandleLog(ctx context.Context, msg LogMessage) error { if msg.Log.Topics[0] == tokenBurnTopicHash { var ( tokenBurner common.Address value big.Int ) if err := tokenBurnEvent.DecodeArgs(msg.Log, &tokenBurner, &value); err != nil { return err } tokenBurnEvent := event.Event{ Index: msg.Log.Index, Block: msg.Log.BlockNumber, ContractAddress: msg.Log.Address.Hex(), Success: true, Timestamp: msg.Timestamp, TxHash: msg.Log.TxHash.Hex(), TxType: burnEventName, Payload: map[string]any{ "tokenBurner": tokenBurner.Hex(), "value": value.String(), }, } return h.pub.Send(ctx, tokenBurnEvent) } return nil } func (h *tokenBurnHandler) HandleRevert(ctx context.Context, msg RevertMessage) error { if len(msg.InputData) < 8 { return nil } switch msg.InputData[:8] { case "42966c68": var value big.Int if err := tokenBurnToSig.DecodeArgs(w3.B(msg.InputData), &value); err != nil { return err } tokenBurnEvent := event.Event{ Block: msg.Block, ContractAddress: msg.ContractAddress, Success: false, Timestamp: msg.Timestamp, TxHash: msg.TxHash, TxType: burnEventName, Payload: map[string]any{ "revertReason": msg.RevertReason, "tokenBurner": msg.From, "value": value.String(), }, } return h.pub.Send(ctx, tokenBurnEvent) } return nil }