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github.com/ackermanx/ethclient
English | 🇨🇳中文
ethclient is extend go-ethereum client for interact with smart contract.
query token balance
calculate uniswap v2/v3 liquid pool address offline
sort token address
encode uniswap v3 path
uniswap v3 liquid pool x96 price format convert
query smart contract data
build contract transaction and main currency transaction
HD wallet
go get -u github.com/ackermanx/ethclient
Below is an example which shows some common use cases for ethereum/client. Check client_test.go for more usage.
package main
import (
"context"
"log"
"math/big"
"time"
"github.com/ackermanx/ethclient"
"github.com/ackermanx/ethclient/abi"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
)
var (
testKey = "33f46d353f191f8067dc7d256e9d9ee7a2a3300649ff7c70fe1cd7e5d5237da5"
)
func main() {
var binanceMainnet = `https://data-seed-prebsc-1-s1.binance.org:8545`
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
c, err := ethclient.DialContext(ctx, binanceMainnet)
cancel()
if err != nil {
panic(err)
}
// get latest height
ctx, cancel = context.WithTimeout(context.Background(), time.Second*5)
blockNumber, err := c.BlockNumber(ctx)
cancel()
if err != nil {
panic(err)
}
log.Println("latest block number: ", blockNumber)
// get busd balance
busdContractAddress := common.HexToAddress("0xed24fc36d5ee211ea25a80239fb8c4cfd80f12ee")
address := "0xe96e6b50db659935878f6f3b0491B7F192cf5F59"
bnbBalance, err := c.BalanceAt(context.Background(), common.HexToAddress(address), nil)
if err != nil {
panic(err)
}
log.Println("bnbBalance: ", bnbBalance.String())
balance, err := c.BalanceOf(address, busdContractAddress.String())
if err != nil {
panic(err)
}
log.Printf("address busd balance: %s\n", balance.String())
// build contract transfer
tx, err := c.BuildContractTx(
testKey, "transfer",
abi.ERC20Abi,
&busdContractAddress, &bind.TransactOpts{From: common.HexToAddress(address)},
common.HexToAddress("0x38F32C2473a314d447d681D30e1C0f5D07194371"),
big.NewInt(100000000000000000),
)
if err != nil {
panic(err)
}
err = c.SendTransaction(context.Background(), tx)
if err != nil {
panic(err)
}
log.Println(tx.Hash().String())
// send bnb
tx, err = c.BuildTransferTx(testKey, "0x38F32C2473a314d447d681D30e1C0f5D07194371", &bind.TransactOpts{
From: common.HexToAddress("0xe96e6b50db659935878f6f3b0491b7f192cf5f59"),
Value: big.NewInt(20000000000000000),
GasLimit: 21000,
})
if err != nil {
panic(err)
}
log.Println(tx.Hash().String())
err = c.SendTransaction(context.Background(), tx)
if err != nil {
panic(err)
}
}
package main
import (
"fmt"
"math/big"
"github.com/ackermanx/ethclient/uniswap"
)
func main() {
weth := "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2"
dai := "0x6b175474e89094c44da98b954eedeac495271d0f"
pair, err := uniswap.CalculatePoolAddressV2(weth, dai)
if err != nil {
panic(err)
}
fmt.Printf("weth-dai pair address in uniswap v2: %s\n", pair.String())
fee := big.NewInt(3000)
poolAddress, err := uniswap.CalculatePoolAddressV3(weth, dai, fee)
if err != nil {
panic(err)
}
fmt.Printf("weth-dai pool address in uniswap v3: %s\n", poolAddress.String())
}
ethereum
had been being developed with GoLand under the free JetBrains Open Source license(s) granted by JetBrains s.r.o., hence I would like to express my thanks here.
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