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add FilterTransferLog TransactionByHash
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| package eth | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/hex" | ||
| "github.com/ethereum/go-ethereum" | ||
| "github.com/ethereum/go-ethereum/common" | ||
| "github.com/ethereum/go-ethereum/ethclient" | ||
| "math/big" | ||
| "strings" | ||
| ) | ||
|
|
||
| const ( | ||
| TokenTypeErc20 = 1 | ||
| TokenTypeErc721 = 2 | ||
| ) | ||
|
|
||
| type TransferEvent struct { | ||
| Txid string | ||
| BlockNumber int64 | ||
| TokenType int | ||
| ContractAddress string | ||
| From string | ||
| To string | ||
| Value string | ||
| } | ||
|
|
||
| func FilterTransferLog(cli *ethclient.Client, fromBlock int64, toBlock int64, contractAddresses []common.Address) ([]TransferEvent, error) { | ||
| //hex.EncodeToString(crypto.Keccak256Hash([]byte("Transfer(address,address,uint256)")).Bytes())) | ||
| transferTopic := "ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef" | ||
| logs, err := cli.FilterLogs(context.Background(), ethereum.FilterQuery{ | ||
| FromBlock: big.NewInt(fromBlock), | ||
| ToBlock: big.NewInt(toBlock), | ||
| Addresses: contractAddresses, | ||
| Topics: [][]common.Hash{[]common.Hash{HexToHash(transferTopic)}}, | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| var evts []TransferEvent | ||
| sz := len(logs) | ||
| if sz > 0 { | ||
| evts = make([]TransferEvent, 0, sz) | ||
| for i := 0; i < sz; i++ { | ||
| log := &logs[i] | ||
| topicLen := len(log.Topics) | ||
| if topicLen == 3 || topicLen == 4 { | ||
| if hex.EncodeToString(log.Topics[0].Bytes()) != transferTopic { // Transfer event | ||
| continue | ||
| } | ||
|
|
||
| from := parseEthLogAddress(hex.EncodeToString(log.Topics[1].Bytes())) | ||
| to := parseEthLogAddress(hex.EncodeToString(log.Topics[2].Bytes())) | ||
|
|
||
| var val string | ||
| var tokenType int | ||
| if topicLen == 3 { // ERC20 Transfer event | ||
| tokenType = TokenTypeErc20 | ||
| val = hex.EncodeToString(log.Data) | ||
| if len(val) == 64 { | ||
| val = parseEthLogValue(val) | ||
| } | ||
| } else if topicLen == 4 { // ERC721 Transfer event | ||
| tokenType = TokenTypeErc721 | ||
| val = parseEthLogValue(hex.EncodeToString(log.Topics[3].Bytes())) | ||
| } | ||
| if val != "" { | ||
| evt := TransferEvent{ | ||
| Txid: log.TxHash.String(), | ||
| BlockNumber: int64(log.BlockNumber), | ||
| TokenType: tokenType, | ||
| ContractAddress: strings.ToLower(log.Address.String()), | ||
| From: from, To: to, Value: val, | ||
| } | ||
| evts = append(evts, evt) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| return evts, nil | ||
| } | ||
|
|
||
| func parseEthLogAddress(addr string) string { | ||
| sz := len(addr) | ||
| if sz >= 40 { | ||
| return "0x" + strings.ToLower(addr[sz-40:]) | ||
| } else { | ||
| return "" | ||
| } | ||
| } | ||
|
|
||
| func parseEthLogValue(val string) string { | ||
| value := strings.TrimLeft(val, "0") | ||
| sz := len(value) | ||
| if sz == 0 { | ||
| value = "00" | ||
| } else if sz%2 == 1 { | ||
| value = "0" + value | ||
| } | ||
| return value | ||
| } |
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