上周在群聊吹牛,吹吹我写的golang 调用solana合约的东西。有人说他要学习go调用solidity的方法。我看了看我在登链的无abi调用合约的方法,写的python的,ethers的,solidity的,就是没写golang的,确实可以写写。
那个群里人都说用chatgpt都会用abigen的方式生成go包的方式调用合约方法。
所以我讲种不需要使用abigen生成go包的方法调用合约。
我还是喜欢使用我的晓道fork版,https://github.com/daog1/ethgo
fork自,umbracle/ethgo
好处我不讲,自己读代码。
合约调用最早都是需要abi文件生成的方式,后面还是有了更简单方式,最早我是ethers里面看到叫
A Human-Readable ABI
ethers是这么写的:
// A Human-Readable ABI; for interacting with the contract, we
// must include any fragment we wish to use
const abi = [
// Read-Only Functions
"function balanceOf(address owner) view returns (uint256)",
"function decimals() view returns (uint8)",
"function symbol() view returns (string)",
// Authenticated Functions
"function transfer(address to, uint amount) returns (bool)",
// Events
"event Transfer(address indexed from, address indexed to, uint amount)"
];
// This can be an address or an ENS name
const address = "0x70ff5c5B1Ad0533eAA5489e0D5Ea01485d530674";
// Read-Only; By connecting to a Provider, allows:
// - Any constant function
// - Querying Filters
// - Populating Unsigned Transactions for non-constant methods
// - Estimating Gas for non-constant (as an anonymous sender)
// - Static Calling non-constant methods (as anonymous sender)
const erc20 = new ethers.Contract(address, abi, provider);
// Read-Write; By connecting to a Signer, allows:
// - Everything from Read-Only (except as Signer, not anonymous)
// - Sending transactions for non-constant functions
const erc20_rw = new ethers.Contract(address, abi, signer);
ethgo 有点fork ethers的意思,所以也支持Human-Readable ABI 的方式。
代码这么写
package main
import (
"fmt"
"math/big"
"github.com/umbracle/ethgo"
"github.com/umbracle/ethgo/abi"
"github.com/umbracle/ethgo/contract"
"github.com/umbracle/ethgo/jsonrpc"
)
func handleErr(err error) {
if err != nil {
panic(err)
}
}
func main() {
var functions = []string{
"function totalSupply() view returns (uint256)", //Human-Readable ABI
}
abiContract, err := abi.NewABIFromList(functions)
handleErr(err)
// Matic token
addr := ethgo.HexToAddress("0x7d1afa7b718fb893db30a3abc0cfc608aacfebb0")
client, err := jsonrpc.NewClient("https://eth.llamarpc.com")
handleErr(err)
c := contract.NewContract(addr, abiContract, contract.WithJsonRPC(client.Eth()))
res, err := c.Call("totalSupply", ethgo.Latest) //call totalSupply
handleErr(err)
fmt.Printf("TotalSupply: %s", res["0"].(*big.Int))
}
原版代码在这里:https://github.com/daog1/ethgo/blob/main/examples/contract-call-basic.go
我的那个fork 版,如果你发现什么问题,可以跟我说。
我一般都用Human-Readable ABI 的方式调用,abigen这种太麻烦了,容易搞错。
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