Contract name: BoredApeYachtClub
2023-06-13 16:32:57 Info Alamat kontrak: 0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d
The contract with the address ```0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d``` is determined to be ERC721 standard.
In this part, we introduced how to determine ERC721 contracts, so contracts like ERC20, which do not support the ERC165 standard, will have to be identified in another way. Do you know how to check if a contract is ERC20 standard?
## Encoding calldata
What is ```calldata```? By the author's understanding, a simple layman's description here is:
> The "calldata" is the encoding of a function call or parameter in Ethereum, and the "calldata" is encoded according to the ABI (Application Binary Interface) specification of the contract.
For example, we can encode the ```balanceOf``` and ```transfer``` method calls of the ERC20 contract we studied in the previous course, together with the parameters of the calls, into a ```calldata```. In some application scenarios, such as **interaction between contracts**, this scenario will use ```calldata```, and of course there are many other application scenarios that are not listed here.
How to code a smart contract function call to get ```calldata```?
In the FMZ Quant Trading Platform, you can use ```exchange.IO("encode", ...)``` to encode smart contract function calls, the use of exchange.IO("encode", ...) is very simple. The first parameter of the function is the fixed string ```"encode"```; the second parameter is the address of the smart contract; the third parameter is the name of the smart contract method to be encoded; the rest of the parameters are passed to the specific parameter value of the smart contract method to be encoded.
### eth_sendRawTransaction
When we encode a smart contract method call and generate the corresponding ```calldata``` data, if this smart contract method is a Write method (i.e.: write operation), we need to use the generated ```calldata``` data as the data field of the transaction and then use the Ethereum RPC method ```eth_ sendRawTransaction``` to send a request containing the raw data of that transaction to the Ethereum network.
The ```eth_sendRawTransaction``` method has only one parameter, ```data```:
> data: The signed transaction (typically signed with a library, using your private key)
The ```data``` parameter is a transaction data after the signature calculation, and the transaction data structure of Ethereum has the following main fields:
```javascript
{
"nonce": "0x1", // Number of transactions on the account of the sender of the transaction
"gasPrice": "0x12a05f200", // Traded Gas price
"gasLimit": "0x5208", // Gas limit for trading
"to": "0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2", // Target contract address or recipient address
"value": "0x4563918244F40000", // Number of Ethereum transferred
"data": "0x0123456789ABCDEF", // Data to send to the contract
}
Bagaimana untuk menandatangani transaksi Ethereum?
Dalam Platform Dagangan Kuantum FMZ, kami menggunakanEncode()fungsi untuk melakukan pengiraan tandatangan, contoh khusus kita menulis dalam kursus berikutnya
Untuk pelaksanaancalldatadaripada kaedah Baca, kita menggunakan kaedah RPC yang dipelajari sebelumnya:eth_callKami menerangkaneth_callRPC kaedah Ethereum hanya melakukan demonstrasiWritekaedah kontrak pintar, dalam bahagian ini, kita menggunakancalldatabalanceOfkaedah kontrak WETH untuk membaca baki semasa token WETH di dompet.
Kami menggunakan alat debugging untuk menguji pada Ethereum mainnet di:
function toAmount(s, decimals) {
return Number((BigDecimal(BigInt(s)) / BigDecimal(Math.pow(10, decimals))).toString())
}
function main() {
// ABI for WETH contracts
var abiWETH = `[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"guy","type":"address"},{"name":"wad","type":"uint256"}],"name":"approve","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"src","type":"address"},{"name":"dst","type":"address"},{"name":"wad","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"wad","type":"uint256"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"dst","type":"address"},{"name":"wad","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"deposit","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":true,"name":"guy","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":true,"name":"dst","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"dst","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Withdrawal","type":"event"}]`
// WETH contract address
var wethAddress = "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"
// Register ABI for WETH contracts
exchange.IO("abi", wethAddress, abiWETH)
// The wallet address of the currently configured exchange object
var walletAddress = exchange.IO("address")
// Coded WETH contract's deposit method call
var calldataForDeposit = exchange.IO("encode", wethAddress, "balanceOf(address)", walletAddress)
Log("calldataForDeposit:", "0x" + calldataForDeposit)
// Construct the transaction as the first parameter of eth_call
var transaction = {
"from" : walletAddress,
"to" : wethAddress,
"data" : "0x" + calldataForDeposit,
}
// The second parameter of eth_call
var blockNumber = "latest"
// Call with eth_call
var ret = exchange.IO("api", "eth", "eth_call", transaction, blockNumber)
var wethBalance = exchange.IO("decode", "uint256", ret) // You can use exchange.IO("decode", ...) function to decode
Log("wethBalance:", toAmount(wethBalance, 18)) // Converted from wei to WETH units
}
Jalankan dalam alat debugging:
2023-06-15 11:51:31 Info wethBalance: 0.015
2023-06-15 11:51:31 Info calldataForDeposit: 0x70a082310000000000000000000000006b3f11d807809b0b1e5e3243df04a280d9f94bf4
Jika kaedah kontrak pintar mempunyai nilai pulangan, anda boleh menggunakanexchange.IO("decode", ...)Anda boleh melihat bahawa luluscalldatakaedah adalah sama seperti memanggil kontrak pintarbalanceOfkaedah secara langsung, mendapatkan baki WETH 0.015 WETH untuk dompet ujian saya.
Untuk pelaksanaan Calldata kaedah Write, adalah perlu untuk menggunakan kaedah RPC:eth_sendRawTransaction.
Mari kita gunakan alat debugging dan menguji ia pada Ethereum mainnet di:
function toAmount(s, decimals) {
return Number((BigDecimal(BigInt(s)) / BigDecimal(Math.pow(10, decimals))).toString())
}
function toInnerAmount(s, decimals) {
return (BigDecimal(s)*BigDecimal(Math.pow(10, decimals))).toFixed(0)
}
function main() {
// ABI for WETH contracts
var abiWETH = `[{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"guy","type":"address"},{"name":"wad","type":"uint256"}],"name":"approve","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"src","type":"address"},{"name":"dst","type":"address"},{"name":"wad","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"wad","type":"uint256"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"dst","type":"address"},{"name":"wad","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"deposit","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":true,"name":"guy","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":true,"name":"dst","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"dst","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Withdrawal","type":"event"}]`
// WETH contract address
var wethAddress = "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"
// Register ABI for WETH contract
exchange.IO("abi", wethAddress, abiWETH)
// The wallet address of the currently configured exchange object
var walletAddress = exchange.IO("address")
// Coded WETH contract's deposit method call
var calldataForDeposit = exchange.IO("encode", wethAddress, "deposit")
Log("calldataForDeposit:", "0x" + calldataForDeposit)
// Get nonce
var nonce = exchange.IO("api", "eth", "eth_getTransactionCount", walletAddress, "pending")
// Get gasPrice
var gasPrice = exchange.IO("api", "eth", "eth_gasPrice")
// Call the deposit method to change ETH to WETH, you need to transfer ETH, here we convert 0.01ETH to a hexadecimal value in wei
var innerAmount = BigInt(Number(toInnerAmount(0.005, 18))).toString(16)
// The transaction call object:
var obj = {
"from" : walletAddress,
"to" : wethAddress,
"gasPrice" : gasPrice,
"value" : "0x" + innerAmount,
"data" : "0x" + calldataForDeposit,
}
// Calculate gasLimit
var gasLimit = exchange.IO("api", "eth", "eth_estimateGas", obj)
// Construct a transaction
var transaction = {
"to": wethAddress,
"value": toAmount("0x" + innerAmount, 0), // Convert to decimal
"data": "0x" + calldataForDeposit,
"gasLimit": toAmount(gasLimit, 0), // Convert to decimal
"gasPrice": toAmount(gasPrice, 0), // Convert to decimal
"nonce": toAmount(nonce, 0), // Convert to decimal
"chainId": 1, // Ethereum mainnet Id
}
Log("transaction:", transaction)
// Signature, your key is replaced with your private key
var signedTx = Encode("signTx", "string", "hex", JSON.stringify(transaction), "hex", "0x" + "your key")
Log("signedTx:", "0x" + signedTx)
// Call eth_sendRawTransaction to send a transaction
var ret = exchange.IO("api", "eth", "eth_sendRawTransaction", "0x" + signedTx)
return ret
}
Jalankan dalam alat debugging:
2023-06-15 09:58:50 Info signedTx: 0xf86f4f8504202067888...
2023-06-15 09:58:50 Info transaction: {"to":"0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2","value":5000000000000000,"data":"0xd0e30db0","gasLimit":27938,"gasPrice":17718863752,"nonce":79,"chainId":1}
2023-06-15 09:58:50 Info calldataForDeposit: 0xd0e30db0
Melakukanvar ret = exchange.IO("api", "eth", "eth_sendRawTransaction", "0x" + signedTx)fungsi dan Hash Transaksi yang dikembalikan adalah:0x2ff585504b0fe59b0122f696e8808abfe2f3ce263448066533f3bb8a4f55e8e6.eth_sendRawTransactionpanggilan menjalankan calldata di dalamnya, memanggildepositkaedah kontrak WETH untuk menukar 0,005 ETH yang dihantar untuk WETH.
Sebelum transaksi pengguna dikemas ke dalam blockchain Ethereum oleh pelombong, semua transaksi akan dikumpulkan dalamMempool(pembungkusan memori transaksi), di mana
Beberapa skrip transaksi juga akan mengendusMempoolSebagai contoh, jika transaksi ditetapkan dengan seluncur pertukaran yang tinggi, urus niaga boleh menjadi subjek "serangan sandwichpending(yang menunggu, untuk dibungkus) transaksi dalamMempool?
Gunakan kaedah RPC yang kita pelajari sebelum ini:eth_getBlockByNumber, tetapi kita tidak lulus khususblockNumberkali ini, kita menggunakan"pending" tag.
function main() {
var data = exchange.IO("api", "eth", "eth_getBlockByNumber", "pending", true)
if (Array.isArray(data.transactions)) {
for (var i = 0; i < data.transactions.length; i++) {
Log(data.transactions[i])
}
}
}
Jalankan dalam alat debugging:
2023-06-18 19:23:05 Info {"blockNumber":"0x10b2027","type":"0x2","accessList":[],"blockHash":"0xf833ed36435c53d63bd7109bb1e85383075534410c14573881bf26d912f46a89","from":"0xd50521974d62f1fa34b8e81cb742ccf6147d05ff","gasPrice":"0x32ea2db37","hash":"0xf8f10f8f473c340b021298feb48d0affe529e8737a309c4cc1902e8989ef0914","input":"0xa22cb4650000000000000000000000001e0049783f008a0085193e00003d00cd54003c710000000000000000000000000000000000000000000000000000000000000001","v":"0x0","value":"0x0","maxFeePerGas":"0x48a413364","maxPriorityFeePerGas":"0x5f5e100","nonce":"0x8","r":"0x8c1cc36f43b02c9e9e454153588cc9d38757f1da69ec49d3cfdda74ab69e06a8","s":"0x2f3dd3e5ddf9e5d42c128a8e900026aca7568fa83c68cf332e1328066ee8d03a","transactionIndex":"0x3a","chainId":"0x1","gas":"0x1142d","to":"0x8c3c0274c33f263f0a55d129cfc8eaa3667a9e8b"}
2023-06-18 19:23:05 Info {"input":"0x646174613a2c7b2270223a226572632d3230222c226f70223a226d696e74222c227469636b223a2265746873222c226964223a223139323732222c22616d74223a2231303030227d","nonce":"0x1d","blockHash":"0xf833ed36435c53d63bd7109bb1e85383075534410c14573881bf26d912f46a89","from":"0xe7fa86855af674837cea1b58f88b5352543ca27b","gas":"0x81cc","gasPrice":"0x32ea2db37","to":"0xe7fa86855af674837cea1b58f88b5352543ca27b","chainId":"0x1","transactionIndex":"0x39","type":"0x2","value":"0x0","accessList":[],"blockNumber":"0x10b2027","hash":"0x55702f5d14736fc9d0c58fdac2d2052a602db171c46b5e1fa9ff6af5c277f9a2","maxFeePerGas":"0x48a413364","maxPriorityFeePerGas":"0x5f5e100","r":"0x5a703d389d23b51adf8ef0f55db8876e7392636797b68a4be6afe73e76d7e1f2","s":"0x4b4bb11257c4434a0acc2672357f8793476e4bfdf98bc30d2389ce335e7de64e","v":"0x1"}
2023-06-18 19:23:05 Info {"gas":"0x186a0","nonce":"0x46533","r":"0xfeea052a4ac2283ca058a657a806ba0916d8e7d52d2a577f150c40eb1dfbec65","s":"0x5bf0089a3c060ba787b67a205b44e1065a0d11d132b41737ab9adf0f55066811","transactionIndex":"0x38","value":"0x78f0975742c400","blockHash":"0xf833ed36435c53d63bd7109bb1e85383075534410c14573881bf26d912f46a89","chainId":"0x1","hash":"0x56bdf1b38e23db66e8d1c4014d1e9f690a9217d8a0232489210325fc69e25cf9","v":"0x25","input":"0x","type":"0x0","blockNumber":"0x10b2027","gasPrice":"0x4a817c800","from":"0x97b9d2102a9a65a26e1ee82d59e42d1b73b68689","to":"0xcb513e99c020e9d15a6eafef873fef5d9f078221"}
...
Mengekstrak satu bahagian data:
{
"blockNumber": "0x10b2027",
"type": "0x2",
"accessList": [],
"blockHash": "0xf833ed36435c53d63bd7109bb1e85383075534410c14573881bf26d912f46a89",
"from": "0xd50521974d62f1fa34b8e81cb742ccf6147d05ff",
"gasPrice": "0x32ea2db37",
"hash": "0xf8f10f8f473c340b021298feb48d0affe529e8737a309c4cc1902e8989ef0914",
"input": "0xa22cb4650000000000000000000000001e0049783f008a0085193e00003d00cd54003c710000000000000000000000000000000000000000000000000000000000000001",
"v": "0x0",
"value": "0x0",
"maxFeePerGas": "0x48a413364",
"maxPriorityFeePerGas": "0x5f5e100",
"nonce": "0x8",
"r": "0x8c1cc36f43b02c9e9e454153588cc9d38757f1da69ec49d3cfdda74ab69e06a8",
"s": "0x2f3dd3e5ddf9e5d42c128a8e900026aca7568fa83c68cf332e1328066ee8d03a",
"transactionIndex": "0x3a",
"chainId": "0x1",
"gas": "0x1142d",
"to": "0x8c3c0274c33f263f0a55d129cfc8eaa3667a9e8b"
}
Dalam Platform Dagangan Kuantum FMZ, kami menggunakanDialfungsi untuk menciptaWebSocketSambungan, anda boleh memeriksaFMZ APIdokumentasi untuk mempelajariDial function.
Kod ujian dalam bahagian ini berjalan di persekitaran Ethereum mainnet, dan lebih mudah untuk menggunakan FMZ Quant untuk menguji dalam perdagangan langsung kerana penggunaan komunikasi protokol WebSocket.
{"jsonrpc": "2.0", "id": 1, "method": "eth_subscribe", "params": ["newPendingTransactions"]}
Selain daripadanewPendingTransactions, anda juga boleh melanggannewHeads, logs.
Menerima data yang didorong olehWebSocketSambungan:
{
"jsonrpc": "2.0",
"method": "eth_subscription",
"params": {
"subscription": "0x2c5c087b4aa188e008f4747828ef4e61",
"result": "0x69c4251cecb814e17cfe7a5ee41742a616f9a4d1bbf245c49b186b1006fd14d3"
}
}
Kemudian pertanyaan lanjuttransactionmengikut mana:"result": "0x69c4251cecb814e17cfe7a5ee41742a616f9a4d1bbf245c49b186b1006fd14d3"Untuk satu perkara tertentu.transaction, kita menggunakan kaedah Ethereum RPCeth_getTransactionByHashuntuk pertanyaan.
var ws = null
function main () {
// {"jsonrpc": "2.0", "id": 1, "method": "eth_subscribe", "params": ["xxxxx"]} , "xxxxx" is the specific message to subscribe to
var payload = {"jsonrpc": "2.0", "id": 1, "method": "eth_subscribe", "params": ["newPendingTransactions"]}
// wss://mainnet.infura.io/ws/v3/xxxxx , "xxxxx" is your infura key
var infuraKey = "your key"
ws = Dial("wss://mainnet.infura.io/ws/v3/" + infuraKey + "|reconnect=true&payload=" + JSON.stringify(payload))
if (!ws) {
throw "websocket link infura failed!"
}
// eth_getTransactionByHash call count
var getTransactionCounter = 0
var beginTS = new Date().getTime()
// Loop to get messages
while (true) {
// Receive push messages
var data = ws.read()
if (data) {
var ts = new Date().getTime()
if (ts - beginTS >= 1000) {
getTransactionCounter = 0
beginTS = ts
}
// Check transaction details based on txHash
if (ts - beginTS < 1000 && getTransactionCounter >= 100) {
Sleep(1000)
getTransactionCounter = 0
beginTS = ts
}
var obj = JSON.parse(data)
if (obj["params"] && obj["params"]["result"]) {
var transcationInfo = exchange.IO("api", "eth", "eth_getTransactionByHash", obj["params"]["result"])
Log(obj["params"]["result"], "transcationInfo:", transcationInfo)
}
getTransactionCounter++
}
LogStatus(_D())
}
}
function onexit() {
Log("Disconnect WS connection")
ws.close()
}
Buat perdagangan langsung untuk menjalankan kod di atas, anda boleh menerima data yang didorong oleh sambungan WebSocket, data yang didorong sentiasa, kita mengekstrak salah satu daripada mereka -transaction:
{
"maxPriorityFeePerGas": "0x5f5e100",
"nonce": "0x1a9",
"accessList": [],
"blockNumber": "0x10b1c9f",
"from": "0x5888700be02f52c8adf85890886ef84a6b8a7829",
"blockHash": "0x92c3d77ea218cdc0967ab74b6005bb393b92355047f206c7e2d59d41828e7fa9",
"chainId": "0x1",
"gasPrice": "0x34fdbf43d",
"s": "0x7d86ae29a786a61b9e74a7a9e2cc4b39b7913aa3d4c3816ccb07528fed82048a",
"to": "0xfc2068c3d47b575a60f6a4a7bf60dea0ac368e01",
"type": "0x2",
"v": "0x1",
"value": "0x0",
"gas": "0x1aad3",
"hash": "0x2c77c0704aefbb26db460cbb71efdb488df968ad53d2c2b3f1e1172056b40b22",
"input": "0x42842e0e0000000000000000000000005888700be02f52c8adf85890886ef84a6b8a7829000000000000000000000000d2d07e4d1bb0f40ac3e4aa7cc3ad05d348bfd2c3000000000000000000000000000000000000000000000000000000000000180b",
"maxFeePerGas": "0x4712d1273",
"r": "0x8ec58f95f6d9729a6eee075e6976658b6c5346cbc90eb68ac361a40af073b10e",
"transactionIndex": "0xc1"
}
Data log yang diambil (sebahagian ketinggalan):
2023-06-18 16:20:07 Info Disconnect WS connection
2023-06-18 16:20:07 Info 0xba07ca903f9eafbfa7d494bb26197713034b9ca2dd3c19bc0898af3f35b59343 transcationInfo: {"accessList":[],"from":"0xe2977d60182da068dfd78693f96362ee7a2e9644","nonce":"0xf","value":"0x0","blockHash":"0x92c3d77ea218cdc0967ab74b6005bb393b92355047f206c7e2d59d41828e7fa9","blockNumber":"0x10b1c9f","chainId":"0x1","hash":"0xba07ca903f9eafbfa7d494bb26197713034b9ca2dd3c19bc0898af3f35b59343","maxFeePerGas":"0x530c30b70","r":"0xf28bfdf372a5401a2e00675c6ebe8d5e73f2c955db44b1aa56240b9197d6cbc7","type":"0x2","v":"0x0","gas":"0x21079","gasPrice":"0x367b3783d","input":"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","maxPriorityFeePerGas":"0x1dcd6500","s":"0x71d51246bb60e792f963a3c75c46fd8f557921ce6face7224c944e1768a76ca","to":"0x0b51eb9d0e54c562fedc07ceba453f05b70c4b79","transactionIndex":"0x40"}
2023-06-18 16:20:07 Info 0x2c77c0704aefbb26db460cbb71efdb488df968ad53d2c2b3f1e1172056b40b22 transcationInfo: {"maxPriorityFeePerGas":"0x5f5e100","nonce":"0x1a9","accessList":[],"blockNumber":"0x10b1c9f","from":"0x5888700be02f52c8adf85890886ef84a6b8a7829","blockHash":"0x92c3d77ea218cdc0967ab74b6005bb393b92355047f206c7e2d59d41828e7fa9","chainId":"0x1","gasPrice":"0x34fdbf43d","s":"0x7d86ae29a786a61b9e74a7a9e2cc4b39b7913aa3d4c3816ccb07528fed82048a","to":"0xfc2068c3d47b575a60f6a4a7bf60dea0ac368e01","type":"0x2","v":"0x1","value":"0x0","gas":"0x1aad3","hash":"0x2c77c0704aefbb26db460cbb71efdb488df968ad53d2c2b3f1e1172056b40b22","input":"0x42842e0e0000000000000000000000005888700be02f52c8adf85890886ef84a6b8a7829000000000000000000000000d2d07e4d1bb0f40ac3e4aa7cc3ad05d348bfd2c3000000000000000000000000000000000000000000000000000000000000180b","maxFeePerGas":"0x4712d1273","r":"0x8ec58f95f6d9729a6eee075e6976658b6c5346cbc90eb68ac361a40af073b10e","transactionIndex":"0xc1"}
2023-06-18 16:20:07 Info 0xbc42d5db10e5cb2e888c76005c522cb2474a0c0a7325feb867b618f69ff26f2a transcationInfo: {"accessList":[],"blockNumber":"0x10b1c9f","gas":"0x1cc12b","hash":"0xbc42d5db10e5cb2e888c76005c522cb2474a0c0a7325feb867b618f69ff26f2a","maxFeePerGas":"0x6ab262e5c","value":"0x0","v":"0x1","chainId":"0x1","from":"0xc1b634853cb333d3ad8663715b08f41a3aec47cc","input":"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
2023-06-18 16:20:06 Info 0xff0945c3d682a37e18ee433d56c8bedbb93d9ac368af968ed8d53b655575e8e5 transcationInfo: {"gas":"0x5208","s":"0x63572e1fa060841b939cea0849154e55781fe0efcbdfe5ce6979b44ce0980e4a","transactionIndex":"0xa7","value":"0x113e9d515e400","blockHash":"0x92c3d77ea218cdc0967ab74b6005bb393b92355047f206c7e2d59d41828e7fa9","hash":"0xff0945c3d682a37e18ee433d56c8bedbb93d9ac368af968ed8d53b655575e8e5","nonce":"0x2","r":"0x698fe26331ad39ba89c4d30985b707792ea4ab09b25205727f8fac2a6120b54a","gasPrice":"0x35458af00","from":"0x228d93af92d03184c07aa9e39b3d2d61b666686d","input":"0x","to":"0x0246177b98a5e42835cdcfaac1c274d3e6c39486","v":"0x26","blockNumber":"0x10b1c9f","type":"0x0","chainId":"0x1"}
...
Dalam kursus sebelumnya, kami menulis program pemantauan untuk memantau transaksi yang sedang menunggu di Ethereum, mendapatkan hash transaksi yang didorong melalui protokol WebSocket, dan kemudian menanyakan butiran transaksi tertentu berdasarkan hash transaksi.
Seterusnya kita mahu melakukan analisis lanjutinputdata medan dalam data butiran transaksi.inputdata medan kelihatan seperti kekacauan data hexadecimal, tetapi ia sebenarnya mengkodkan kandungan transaksi: termasuk fungsi dipanggil, dan parameter yang dimasukkan, dll
Selepas ujian berulang dan meluas, kami mendapati bahawa ketepatan masa dan kuantiti data yang didorong oleh sambungan WebSocket mempunyai banyak kaitan dengan nod RPC yang kini digunakan, dan data yang didorong yang diterima oleh dua perkhidmatan nod RPC yang berbeza (contohnya, infura, ALCHEMY) ketika membuat sambungan WebSocket pada masa yang sama tidak sama persis, dan kerana senario semasa menghasilkan sebilangan besar permintaan, kita masih perlu menggunakan perkhidmatan RPC yang lebih stabil dan lebih cepat. Sambungan WebSocket juga mendorong banyak hash transaksi yang telah menunggu untuk masa yang lama, dan apabila menggunakaneth_getTransactionByHashuntuk pertanyaan, anda sering mendapat nilai null (diuji di FMZ, node.js).
Kami menggunakanalchemyRPC nod kali ini:wss://eth-mainnet.g.alchemy.com/v2/oKmOQKbneVkxgHZfibs-iFhIlIAl6HDN. Nod menyokong kedua-dua protokol WebSocket dan REST.
Kami memantaumulticall(uint256,bytes[])kaedah kontrak pintar penghala pertukaran terdesentralisasi Uniswap, jadi kita perlu mengira fungsi tanda tangan hash kaedah pertama.
// Take the first 8 characters of the complete hash
// multicall: 0x5ae401dc
var sigHash = "0x" + Encode("keccak256", "string", "hex", "multicall(uint256,bytes[])").slice(0, 8)
Berdasarkan contoh dalam pelajaran sebelumnya, kita telah membuat beberapa pengubahsuaian. Apabila menerima mesej yang didorong oleh sambungan WebSocket, data terkini diterima menggunakanvar data = ws.read(-2)kaedah, danread()parameter fungsi ditetapkan kepada -2 untuk menunjukkan bahawa data terkini dikembalikan dengan segera.Transactionyang mengandungimulticallpanggilan, menggunakanif (tx && tx.input.indexOf(sigHash) ! == -1)untuk menentukan penapis.
2 fungsi tersuai perlu direka:
calcAllFuncSigHash(): Mengira hash tandatangan untuk semua kaedah berdasarkan ABI.decodeCall()Fungsi penyahkodan.Seterusnya, apabilamulticallpanggilan dikesan, operasi decoding boleh bermula, dan parametermulticallkaedah telah di-decode untuk kali pertama:deadlinedandata. deadlineadalah cap masa yang lebih difahami, dandataadalah satu lagi dikodkancalldata, jadi anda masih perlu terus menggunakandecodeCall()Fungsi untuk menyahkodnya.
Contoh pelaksanaan lengkap:
var ws = null
var arrLog = []
const ABI_Route = '[{"inputs":[{"internalType":"address","name":"_factoryV2","type":"address"},{"internalType":"address","name":"factoryV3","type":"address"},{"internalType":"address","name":"_positionManager","type":"address"},{"internalType":"address","name":"_WETH9","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"WETH9","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"approveMax","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"approveMaxMinusOne","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"approveZeroThenMax","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"approveZeroThenMaxMinusOne","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes","name":"data","type":"bytes"}],"name":"callPositionManager","outputs":[{"internalType":"bytes","name":"result","type":"bytes"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes[]","name":"paths","type":"bytes[]"},{"internalType":"uint128[]","name":"amounts","type":"uint128[]"},{"internalType":"uint24","name":"maximumTickDivergence","type":"uint24"},{"internalType":"uint32","name":"secondsAgo","type":"uint32"}],"name":"checkOracleSlippage","outputs":[],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"path","type":"bytes"},{"internalType":"uint24","name":"maximumTickDivergence","type":"uint24"},{"internalType":"uint32","name":"secondsAgo","type":"uint32"}],"name":"checkOracleSlippage","outputs":[],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"bytes","name":"path","type":"bytes"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMinimum","type":"uint256"}],"internalType":"struct IV3SwapRouter.ExactInputParams","name":"params","type":"tuple"}],"name":"exactInput","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"address","name":"tokenOut","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMinimum","type":"uint256"},{"internalType":"uint160","name":"sqrtPriceLimitX96","type":"uint160"}],"internalType":"struct IV3SwapRouter.ExactInputSingleParams","name":"params","type":"tuple"}],"name":"exactInputSingle","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes","name":"path","type":"bytes"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMaximum","type":"uint256"}],"internalType":"struct IV3SwapRouter.ExactOutputParams","name":"params","type":"tuple"}],"name":"exactOutput","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"address","name":"tokenOut","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMaximum","type":"uint256"},{"internalType":"uint160","name":"sqrtPriceLimitX96","type":"uint160"}],"internalType":"struct IV3SwapRouter.ExactOutputSingleParams","name":"params","type":"tuple"}],"name":"exactOutputSingle","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"factory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"factoryV2","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"getApprovalType","outputs":[{"internalType":"enum IApproveAndCall.ApprovalType","name":"","type":"uint8"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"token0","type":"address"},{"internalType":"address","name":"token1","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"amount0Min","type":"uint256"},{"internalType":"uint256","name":"amount1Min","type":"uint256"}],"internalType":"struct IApproveAndCall.IncreaseLiquidityParams","name":"params","type":"tuple"}],"name":"increaseLiquidity","outputs":[{"internalType":"bytes","name":"result","type":"bytes"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"token0","type":"address"},{"internalType":"address","name":"token1","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"int24","name":"tickLower","type":"int24"},{"internalType":"int24","name":"tickUpper","type":"int24"},{"internalType":"uint256","name":"amount0Min","type":"uint256"},{"internalType":"uint256","name":"amount1Min","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"internalType":"struct IApproveAndCall.MintParams","name":"params","type":"tuple"}],"name":"mint","outputs":[{"internalType":"bytes","name":"result","type":"bytes"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"previousBlockhash","type":"bytes32"},{"internalType":"bytes[]","name":"data","type":"bytes[]"}],"name":"multicall","outputs":[{"internalType":"bytes[]","name":"","type":"bytes[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"bytes[]","name":"data","type":"bytes[]"}],"name":"multicall","outputs":[{"internalType":"bytes[]","name":"","type":"bytes[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes[]","name":"data","type":"bytes[]"}],"name":"multicall","outputs":[{"internalType":"bytes[]","name":"results","type":"bytes[]"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"positionManager","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"pull","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"refundETH","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"selfPermit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"selfPermitAllowed","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"selfPermitAllowedIfNecessary","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"selfPermitIfNecessary","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"}],"name":"swapExactTokensForTokens","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"}],"name":"swapTokensForExactTokens","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"name":"sweepToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountMinimum","type":"uint256"}],"name":"sweepToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"uint256","name":"feeBips","type":"uint256"},{"internalType":"address","name":"feeRecipient","type":"address"}],"name":"sweepTokenWithFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"feeBips","type":"uint256"},{"internalType":"address","name":"feeRecipient","type":"address"}],"name":"sweepTokenWithFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"int256","name":"amount0Delta","type":"int256"},{"internalType":"int256","name":"amount1Delta","type":"int256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"uniswapV3SwapCallback","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"name":"unwrapWETH9","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountMinimum","type":"uint256"}],"name":"unwrapWETH9","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"feeBips","type":"uint256"},{"internalType":"address","name":"feeRecipient","type":"address"}],"name":"unwrapWETH9WithFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"uint256","name":"feeBips","type":"uint256"},{"internalType":"address","name":"feeRecipient","type":"address"}],"name":"unwrapWETH9WithFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"name":"wrapETH","outputs":[],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]'
function calcAllFuncSigHash(jsonABI) {
var mapSigHash = {}
for (var i in jsonABI) {
var ele = jsonABI[i]
if (typeof(ele["name"]) != "undefined") {
if (ele["inputs"]) {
var funcName = ele["name"]
if (ele["inputs"].length == 0) {
var methodId = "0x" + Encode("keccak256", "string", "hex", funcName + "()").slice(0, 8)
mapSigHash[methodId] = {"argsTypeList": [], "argsNameList": [], "funcName": funcName}
} else {
var arr = []
var arrName = []
var argPrototype = []
for (var j in ele["inputs"]) {
var inputType = ele["inputs"][j]["type"]
if (inputType == "tuple") {
var components = ele["inputs"][j]["components"]
var tupleType = []
var protoType = []
for (var componentsIdx = 0; componentsIdx < components.length; componentsIdx++) {
tupleType.push(components[componentsIdx]["type"])
protoType.push(components[componentsIdx]["name"] + " " + components[componentsIdx]["type"])
}
arr.push("(" + tupleType.join() + ")")
arrName.push(ele["inputs"][j]["name"])
// Prototype
argPrototype.push("tuple" + "(" + protoType.join() + ")")
} else {
arr.push(inputType)
arrName.push(ele["inputs"][j]["name"])
// Prototype
argPrototype.push(inputType)
}
}
var functionSignature = funcName + "(" + arr.join() + ")"
var methodId = "0x" + Encode("keccak256", "string", "hex", functionSignature).slice(0, 8)
mapSigHash[methodId] = {"argsTypeList": arr, "argsNameList": arrName, "funcName": funcName, "argPrototype": argPrototype}
}
}
}
}
return mapSigHash
}
function decodeCall(input, abi) {
var mapSigHash = calcAllFuncSigHash(JSON.parse(abi))
var methodId = input.slice(0, 10)
var data = input.slice(10)
var decodedArgs = {}
var infoMethod = mapSigHash[methodId]
if (typeof(infoMethod) == "undefined") {
return [methodId, mapSigHash]
}
var arr = []
for (var i = 0; i < infoMethod["argsTypeList"].length; i++) {
if (infoMethod["argsTypeList"][i].startsWith("(")) {
arr.push(infoMethod["argPrototype"][i])
} else {
arr.push(infoMethod["argsTypeList"][i])
}
}
if (arr.length == 0) {
return {"funcName": infoMethod["funcName"], "args": decodedArgs}
}
var args = exchange.IO("decode", arr.join(), data)
if (!Array.isArray(args)) {
args = [args]
}
if (args.length != infoMethod["argsNameList"].length) {
Log("args:", args)
Log("infoMethod:", infoMethod)
throw "The decoded args are not equal to the argsNameList"
}
for (var i = 0; i < infoMethod["argsNameList"].length; i++) {
var key = infoMethod["argsNameList"][i]
var value = args[i]
decodedArgs[key] = value
}
return {"funcName": infoMethod["funcName"], "args": decodedArgs}
}
function main () {
// {"jsonrpc": "2.0", "id": 1, "method": "eth_subscribe", "params": ["xxxxx"]} , "xxxxx" is the specific message of the subscription
var payload = {"jsonrpc": "2.0", "id": 1, "method": "eth_subscribe", "params": ["newPendingTransactions"]}
// Use the alchemy service
ws = Dial("wss://eth-mainnet.g.alchemy.com/v2/oKmOQKbneVkxgHZfibs-iFhIlIAl6HDN" + "|reconnect=true&payload=" + JSON.stringify(payload))
if (!ws) {
throw "websocket link to alchemy failed!"
}
// eth_getTransactionByHash call count
var getTransactionCounter = 0
// Start Timestamp
var beginTS = new Date().getTime()
// Calculate function signature hash
var sigHash = "0x" + Encode("keccak256", "string", "hex", "multicall(uint256,bytes[])").slice(0, 8)
Log("sigHash:", sigHash)
// Loop for messages
while (true) {
var msg = ""
var recv = null
// Receive pushed messages, use the read parameter -2, and return the latest data immediately
var data = ws.read(-2)
if (data && data != "") {
var ts = new Date().getTime()
if (ts - beginTS >= 1000) {
getTransactionCounter = 0
beginTS = ts
}
// Check transaction details based on txHash
if (ts - beginTS < 1000 && getTransactionCounter >= 100) {
Sleep(1000)
getTransactionCounter = 0
beginTS = ts
}
var obj = JSON.parse(data)
if (obj["params"] && obj["params"]["result"]) {
var txHash = obj["params"]["result"]
var tx = exchange.IO("api", "eth", "eth_getTransactionByHash", txHash)
if (tx && tx.input.indexOf(sigHash) !== -1) {
// Decode transaction details
arrLog = []
var decodedInput = decodeCall(tx.input, ABI_Route)
// Log("----------------", txHash, "/", decodedInput["funcName"], "----------------", "#FF0000")
arrLog.push("----------------" + txHash + "/" + decodedInput["funcName"] + "----------------" + "#FF0000")
arrLog.push(tx.from + " -> " + tx.to)
for (var i = 0; i < decodedInput["args"][