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main.go
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main.go
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package main
import (
"encoding/json"
"io"
"log"
"net/http"
"net/url"
"os"
"os/exec"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/ethereum/go-ethereum/rpc"
"github.com/sinakhalili/abigenz/abis"
)
type EtherscanResponse struct {
Status string `json:"status"`
Message string `json:"message"`
Result string `json:"result"`
}
func main() {
log.Println("Hello, sailor")
etherscan_api_key := os.Getenv("ETHERSCAN_API_KEY")
if etherscan_api_key == "" {
log.Printf("Error: ")
log.Println("Please set the environment variable ETHERSCAN_API_KEY")
return
}
linkpool_free_rpc := "wss://main-light.eth.linkpool.io/ws"
log.Println("Websocket url: ", linkpool_free_rpc)
// Connect to the RPC.
rpcClient, err := rpc.Dial(linkpool_free_rpc)
if err != nil {
log.Fatalln("Unable to connect to the RPC!")
}
ethClient := ethclient.NewClient(rpcClient)
if len(os.Args) < 2 {
log.Println("Usage: abigenz [CONTRACT ADDRESS]")
return
}
contract_address := os.Args[1]
log.Printf("Looking for contract %s\n", contract_address)
contract_hex := common.HexToAddress(contract_address)
contract, err := abis.NewERC20(contract_hex, ethClient)
if err != nil {
log.Fatalln(err)
}
tokenName, err := contract.Name(&bind.CallOpts{})
if err != nil {
log.Fatalln(err)
}
log.Println("Contract name: ", tokenName)
/*
etherscan calls are made in the following format
(https://docs.etherscan.io/api-endpoints/contracts)
*/
base, err := url.Parse("https://api.etherscan.io/api")
if err != nil {
return
}
params := url.Values{}
params.Add("module", "contract")
params.Add("action", "getabi")
params.Add("address", contract_address)
params.Add("apiKey", etherscan_api_key)
base.RawQuery = params.Encode()
resp, err := http.Get(base.String())
if err != nil {
log.Println("Oh no! Got: ")
body, err := io.ReadAll(resp.Body)
log.Println(string(body))
log.Fatalln(err)
}
body, err := io.ReadAll(resp.Body)
if err != nil {
log.Fatalln(err)
}
var etherscan_response EtherscanResponse
err = json.Unmarshal(body, ðerscan_response)
if err != nil {
log.Fatal(err)
}
log.Printf("Etherscan says: %s\n", etherscan_response.Message)
if etherscan_response.Message == "NOTOK" {
log.Fatal("Error: ", etherscan_response.Result)
}
filename := tokenName + ".json"
if err := os.WriteFile(filename, []byte(etherscan_response.Result), 0666); err != nil {
log.Fatal(err)
}
log.Println("Abi in ", filename)
// abigen --pkg main --abi abi.json --out out.go
go_filename := tokenName + ".go"
cmd := exec.Command("abigen", "--pkg", "abis", "--abi", filename, "--out", go_filename)
err = cmd.Run()
if err != nil {
log.Fatal(err)
}
log.Println("Go file in ", go_filename)
}