forked from forks/go-multicall
93 lines
2.2 KiB
Markdown
93 lines
2.2 KiB
Markdown
# go-multicall
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A thin Go client for making multiple function calls in single `eth_call` request
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- Uses the go-ethereum tools and libraries
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- Interfaces with the [MakerDAO `Multicall3` contract](https://github.com/mds1/multicall)
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_**Warning:** MakerDAO Multicall contracts are different than the [OpenZeppelin Multicall contract](https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/Multicall.sol). Please see [this thread](https://forum.openzeppelin.com/t/multicall-by-oz-and-makerdao-has-a-difference/9350) in the OpenZeppelin forum if you are looking for an explanation._
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## Install
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```
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go get github.com/forta-network/go-multicall
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```
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## Example
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(See other examples under the `examples` directory!)
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```go
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package main
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import (
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"context"
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"fmt"
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"math/big"
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"github.com/forta-network/go-multicall"
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"github.com/ethereum/go-ethereum/common"
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)
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const (
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APIURL = "https://cloudflare-eth.com"
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ERC20ABI = `[
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{
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"constant":true,
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"inputs":[
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{
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"name":"tokenOwner",
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"type":"address"
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}
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],
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"name":"balanceOf",
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"outputs":[
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{
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"name":"balance",
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"type":"uint256"
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}
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],
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"payable":false,
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"stateMutability":"view",
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"type":"function"
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}
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]`
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)
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type balanceOutput struct {
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Balance *big.Int
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}
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func main() {
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caller, err := multicall.Dial(context.Background(), APIURL)
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if err != nil {
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panic(err)
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}
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contract, err := multicall.NewContract(ERC20ABI, "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48")
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if err != nil {
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panic(err)
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}
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calls, err := caller.Call(nil,
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contract.NewCall(
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new(balanceOutput),
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"balanceOf",
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common.HexToAddress("0xcEe284F754E854890e311e3280b767F80797180d"), // Arbitrum One gateway
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).Name("Arbitrum One gateway balance"),
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contract.NewCall(
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new(balanceOutput),
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"balanceOf",
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common.HexToAddress("0x40ec5B33f54e0E8A33A975908C5BA1c14e5BbbDf"), // Polygon ERC20 bridge
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).Name("Polygon ERC20 bridge balance"),
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)
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if err != nil {
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panic(err)
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}
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for _, call := range calls {
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fmt.Println(call.CallName, ":", call.Outputs.(*balanceOutput).Balance)
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}
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}
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```
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