读取区块链event

c, err = nft.NewContract(common.HexToAddress(contractAddr), client)
if err != nil {
	return err
}
query := ethereum.FilterQuery{
	FromBlock: big.NewInt(number + 1),
	ToBlock:   big.NewInt(toBlock),
	Addresses: []common.Address{common.HexToAddress(contractAddr)},
}
vLogs, err = client.FilterLogs(context.Background(), query)
if err != nil {
	return err
}

for _, vLog := range vLogs {
	event, data, err := nft.ParseEventLog(_abi, c, vLog)
	if err != nil {
		return err
	}

	if event != "" {
		err = OnEvent(context.Background(), event, vLog.TxHash.Hex(), vLog.Index, data)
		if err != nil {
			return err
		}
	}
}

func ParseEventLog(abiInstance abi.ABI, c *Contract, vLog types.Log) (event string, data interface{},
err error) {
switch vLog.Topics[0].Hex() {
case abiInstance.Events[EventApproval].ID.Hex():
event = EventApproval
data, err = c.ParseApproval(vLog)
return}