wip - golang tests

.env.sample

@@ -0,0 +1,3 @@
+PRIVATE_KEY=YOUR_PRIVATE_KEY
+INFURA_URL='https://testnet.hashio.io/api'
+CHAIN_ID=296

.gitignore

@@ -0,0 +1,2 @@
+.env
+hedera-golang-example-project

README.md

@@ -0,0 +1,13 @@
+1. Install go: https://go.dev/doc/install
+2. sudo apt install solc
+3. https://docs.soliditylang.org/en/latest/installing-solidity.html
+2. go get github.com/ethereum/go-ethereum/ethclient
+3. go get github.com/ethereum/go-ethereum
+   go get github.com/ethereum/go-ethereum/accounts/abi/bind
+   go get github.com/ethereum/go-ethereum/crypto
+4. go get github.com/joho/godotenv
+5. export GOPATH=$HOME/go
+   export PATH=$PATH:$GOPATH/bin
+5. go install github.com/ethereum/go-ethereum/cmd/abigen@latest
+3. go build .
+4. ./hedera-golang-example-project - run tests

cache/.gitignore

@@ -0,0 +1 @@
+*

client.go

@@ -0,0 +1,208 @@
+package main
+
+import (
+    "bytes"
+    "context"
+    "crypto/ecdsa"
+    "encoding/json"
+    "fmt"
+    "log"
+    "math/big"
+    "os"
+    "os/exec"
+    "strings"
+    "io/ioutil"
+    "path/filepath"
+    "github.com/ethereum/go-ethereum"
+    "github.com/ethereum/go-ethereum/accounts/abi"
+    "github.com/ethereum/go-ethereum/accounts/abi/bind"
+    "github.com/ethereum/go-ethereum/common"
+    "github.com/ethereum/go-ethereum/crypto"
+    "github.com/ethereum/go-ethereum/ethclient"
+    "github.com/joho/godotenv"
+)
+
+type CompilationResult struct {
+    Contracts map[string]struct {
+        ABI      json.RawMessage
+        Bin      string
+        Metadata string
+    } `json:"contracts"`
+}
+
+func compileContract(filePath string) (string, []byte, error) {
+    cmd := exec.Command("solc", "--combined-json", "abi,bin", filePath)
+    var out bytes.Buffer
+    cmd.Stdout = &out
+    err := cmd.Run()
+    if err != nil {
+        return "", nil, fmt.Errorf("failed to compile contract: %v", err)
+    }
+    var result CompilationResult
+    err = json.Unmarshal(out.Bytes(), &result)
+    if err != nil {
+        return "", nil, fmt.Errorf("failed to parse solc output: %v", err)
+    }
+    for _, contract := range result.Contracts {
+        abiBytes, err := json.Marshal(contract.ABI)
+        if err != nil {
+            return "", nil, fmt.Errorf("failed to marshal ABI: %v", err)
+        }
+        bin := contract.Bin
+        return bin, abiBytes, nil
+    }
+
+    return "", nil, fmt.Errorf("no contract found in solc output")
+}
+
+func loadFromFile(filename string) (string, error) {
+    data, err := ioutil.ReadFile(filename)
+    if err != nil {
+        return "", err
+    }
+    return string(data), nil
+}
+
+func saveToFile(filename string, data []byte) error {
+    return ioutil.WriteFile(filename, data, 0644)
+}
+
+func main() {
+    err := godotenv.Load()
+    if err != nil {
+        log.Fatalf("Error loading .env file")
+    }
+    infuraURL := os.Getenv("INFURA_URL")
+    privateKeyHex := os.Getenv("PRIVATE_KEY")
+    client, err := ethclient.Dial(infuraURL)
+    if err != nil {
+        log.Fatal(err)
+    }
+    fmt.Println("we have a connection")
+    privateKeyHex = strings.TrimPrefix(privateKeyHex, "0x")
+    privateKey, err := crypto.HexToECDSA(privateKeyHex)
+    if err != nil {
+        log.Fatalf("Failed to parse private key: %v", err)
+    }
+    publicKey := privateKey.Public()
+    publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
+    if !ok {
+        log.Fatal("Failed to cast public key to ECDSA")
+    }
+    fromAddress := crypto.PubkeyToAddress(*publicKeyECDSA)
+    fmt.Printf("Using address: %s\n", fromAddress.Hex())
+    balance, err := client.BalanceAt(context.Background(), fromAddress, nil)
+    if err != nil {
+        log.Fatalf("Failed to get balance: %v", err)
+    }
+    fmt.Printf("Account balance: %s\n", balance.String())
+    nonce, err := client.PendingNonceAt(context.Background(), fromAddress)
+    if err != nil {
+        log.Fatalf("Failed to get nonce: %v", err)
+    }
+    fmt.Printf("Using nonce: %d\n", nonce)
+    gasPrice, err := client.SuggestGasPrice(context.Background())
+    if err != nil {
+        log.Fatalf("Failed to get gas price: %v", err)
+    }
+    fmt.Printf("Using gas price: %s\n", gasPrice.String())
+    bin, abiBytes, err := compileContract("contracts/Greeter.sol")
+    if err != nil {
+        log.Fatalf("Failed to compile contract: %v", err)
+    }
+    cacheDir := "cache"
+    if _, err := os.Stat(cacheDir); os.IsNotExist(err) {
+        err = os.Mkdir(cacheDir, 0755)
+        if err != nil {
+            log.Fatalf("Failed to create cache directory: %v", err)
+        }
+    }
+    err = saveToFile(filepath.Join(cacheDir, "Greeter.bin"), []byte(bin))
+    if err != nil {
+        log.Fatalf("Failed to save bytecode: %v", err)
+    }
+    err = saveToFile(filepath.Join(cacheDir, "Greeter.abi"), abiBytes)
+    if err != nil {
+        log.Fatalf("Failed to save ABI: %v", err)
+    }
+    fmt.Println("Saved ABI and bytecode to cache files.")
+    parsedABI, err := abi.JSON(bytes.NewReader(abiBytes))
+    if err != nil {
+        log.Fatalf("Failed to parse ABI: %v", err)
+    }
+    bytecode := common.FromHex(bin)
+    auth := bind.NewKeyedTransactor(privateKey)
+    auth.Nonce = big.NewInt(int64(nonce))
+    auth.Value = big.NewInt(0)
+    auth.GasLimit = uint64(3000000)
+    auth.GasPrice = gasPrice
+    totalCost := new(big.Int).Mul(big.NewInt(int64(auth.GasLimit)), gasPrice)
+    fmt.Printf("Total transaction cost: %s\n", totalCost.String())
+
+    if balance.Cmp(totalCost) < 0 {
+        log.Fatalf("Insufficient funds: balance %s, needed %s", balance.String(), totalCost.String())
+    }
+    initialGreeting := "Hello, World!"
+    fmt.Printf("Transaction details:\n")
+    fmt.Printf("  From Address: %s\n", fromAddress.Hex())
+    fmt.Printf("  Nonce: %d\n", nonce)
+    fmt.Printf("  Gas Price: %s\n", gasPrice.String())
+    fmt.Printf("  Gas Limit: %d\n", auth.GasLimit)
+    fmt.Printf("  Initial Greeting: %s\n", initialGreeting)
+    addressFilePath := "cache/address"
+    var contractAddress common.Address
+    if _, err := os.Stat(addressFilePath); err == nil {
+        address, err := loadFromFile(addressFilePath)
+        if err != nil {
+            log.Fatalf("Failed to load contract address: %v", err)
+        }
+        contractAddress = common.HexToAddress(address)
+        fmt.Printf("Contract already deployed at address: %s\n", address)
+    } else {
+        address, tx, _, err := bind.DeployContract(auth, parsedABI, bytecode, client, initialGreeting)
+        if err != nil {
+            log.Fatalf("Failed to deploy contract: %v", err)
+        }
+        contractAddress = address
+
+        fmt.Printf("Contract deployed to address: %s\n", address.Hex())
+        fmt.Printf("Transaction hash: %s\n", tx.Hash().Hex())
+
+        err = saveToFile(addressFilePath, []byte(address.Hex()))
+        if err != nil {
+            log.Fatalf("Failed to save contract address: %v", err)
+        }
+        fmt.Println("Saved contract address to file.")
+    }
+    interactWithContract(client, contractAddress, privateKey, parsedABI)
+}
+
+func interactWithContract(client *ethclient.Client, contractAddress common.Address, privateKey *ecdsa.PrivateKey, parsedABI abi.ABI) {
+    chainId := big.NewInt(296)
+    auth, err := bind.NewKeyedTransactorWithChainID(privateKey, chainId)
+    auth.GasLimit = uint64(3000000)
+    newGreeting := "Hello, Ethereum!"
+    fmt.Printf("Setting new greeting to: %s\n", newGreeting)
+
+    boundContract := bind.NewBoundContract(contractAddress, parsedABI, client, client, client)
+
+    setGreetingTx, err := boundContract.Transact(auth, "setGreeting", newGreeting)
+    if err != nil {
+        log.Fatalf("Failed to set greeting: %v", err)
+    }
+    fmt.Printf("Set greeting transaction hash: %s\n", setGreetingTx.Hash().Hex())
+    callMsg := ethereum.CallMsg{
+        To:   &contractAddress,
+        Data: common.FromHex("0xcfae3217"), // greeting method selector.
+    }
+
+    res, err := client.CallContract(context.Background(), callMsg, nil)
+    if err != nil {
+        log.Fatalf("Failed to get greeting: %v", err)
+    }
+    length := new(big.Int).SetBytes(res[32:64]).Int64()
+    greeting := string(res[64 : 64+length])
+    greeting = strings.TrimRight(greeting, "\x00")
+
+    log.Printf("Greeting: %s", greeting)
+}

contracts/Greeter.sol

@@ -0,0 +1,27 @@
+//SPDX-License-Identifier: MIT
+pragma solidity ^0.8.9;
+
+contract Greeter {
+    string private greeting;
+
+    event GreetingSet(string greeting);
+
+    //This constructor assigns the initial greeting and emit GreetingSet event
+    constructor(string memory _greeting) {
+        greeting = _greeting;
+
+        emit GreetingSet(_greeting);
+    }
+
+    //This function returns the current value stored in greeting variable
+    function greet() public view returns (string memory) {
+        return greeting;
+    }
+
+    //This function sets the new greeting msg from the one passed down as parameter and emit event
+    function setGreeting(string memory _greeting) public {
+        greeting = _greeting;
+
+        emit GreetingSet(_greeting);
+    }
+}

go.mod

@@ -0,0 +1,34 @@
+module hedera-golang-example-project
+
+go 1.22.3
+
+require (
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/StackExchange/wmi v1.2.1 // indirect
+	github.com/bits-and-blooms/bitset v1.10.0 // indirect
+	github.com/btcsuite/btcd/btcec/v2 v2.2.0 // indirect
+	github.com/consensys/bavard v0.1.13 // indirect
+	github.com/consensys/gnark-crypto v0.12.1 // indirect
+	github.com/crate-crypto/go-kzg-4844 v1.0.0 // indirect
+	github.com/deckarep/golang-set/v2 v2.1.0 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect
+	github.com/ethereum/c-kzg-4844 v1.0.0 // indirect
+	github.com/ethereum/go-ethereum v1.14.3 // indirect
+	github.com/fsnotify/fsnotify v1.6.0 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/holiman/uint256 v1.2.4 // indirect
+	github.com/joho/godotenv v1.5.1 // indirect
+	github.com/mmcloughlin/addchain v0.4.0 // indirect
+	github.com/shirou/gopsutil v3.21.4-0.20210419000835-c7a38de76ee5+incompatible // indirect
+	github.com/supranational/blst v0.3.11 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
+	golang.org/x/crypto v0.22.0 // indirect
+	golang.org/x/mod v0.17.0 // indirect
+	golang.org/x/sync v0.7.0 // indirect
+	golang.org/x/sys v0.19.0 // indirect
+	golang.org/x/tools v0.20.0 // indirect
+	rsc.io/tmplfunc v0.0.3 // indirect
+)

go.sum

@@ -0,0 +1,65 @@
+github.com/Microsoft/go-winio v0.6.1 h1:9/kr64B9VUZrLm5YYwbGtUJnMgqWVOdUAXu6Migciow=
+github.com/Microsoft/go-winio v0.6.1/go.mod h1:LRdKpFKfdobln8UmuiYcKPot9D2v6svN5+sAH+4kjUM=
+github.com/StackExchange/wmi v1.2.1 h1:VIkavFPXSjcnS+O8yTq7NI32k0R5Aj+v39y29VYDOSA=
+github.com/StackExchange/wmi v1.2.1/go.mod h1:rcmrprowKIVzvc+NUiLncP2uuArMWLCbu9SBzvHz7e8=
+github.com/bits-and-blooms/bitset v1.10.0 h1:ePXTeiPEazB5+opbv5fr8umg2R/1NlzgDsyepwsSr88=
+github.com/bits-and-blooms/bitset v1.10.0/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
+github.com/btcsuite/btcd/btcec/v2 v2.2.0 h1:fzn1qaOt32TuLjFlkzYSsBC35Q3KUjT1SwPxiMSCF5k=
+github.com/btcsuite/btcd/btcec/v2 v2.2.0/go.mod h1:U7MHm051Al6XmscBQ0BoNydpOTsFAn707034b5nY8zU=
+github.com/consensys/bavard v0.1.13 h1:oLhMLOFGTLdlda/kma4VOJazblc7IM5y5QPd2A/YjhQ=
+github.com/consensys/bavard v0.1.13/go.mod h1:9ItSMtA/dXMAiL7BG6bqW2m3NdSEObYWoH223nGHukI=
+github.com/consensys/gnark-crypto v0.12.1 h1:lHH39WuuFgVHONRl3J0LRBtuYdQTumFSDtJF7HpyG8M=
+github.com/consensys/gnark-crypto v0.12.1/go.mod h1:v2Gy7L/4ZRosZ7Ivs+9SfUDr0f5UlG+EM5t7MPHiLuY=
+github.com/crate-crypto/go-kzg-4844 v1.0.0 h1:TsSgHwrkTKecKJ4kadtHi4b3xHW5dCFUDFnUp1TsawI=
+github.com/crate-crypto/go-kzg-4844 v1.0.0/go.mod h1:1kMhvPgI0Ky3yIa+9lFySEBUBXkYxeOi8ZF1sYioxhc=
+github.com/deckarep/golang-set/v2 v2.1.0 h1:g47V4Or+DUdzbs8FxCCmgb6VYd+ptPAngjM6dtGktsI=
+github.com/deckarep/golang-set/v2 v2.1.0/go.mod h1:VAky9rY/yGXJOLEDv3OMci+7wtDpOF4IN+y82NBOac4=
+github.com/decred/dcrd/crypto/blake256 v1.0.0/go.mod h1:sQl2p6Y26YV+ZOcSTP6thNdn47hh8kt6rqSlvmrXFAc=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 h1:YLtO71vCjJRCBcrPMtQ9nqBsqpA1m5sE92cU+pd5Mcc=
+github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1/go.mod h1:hyedUtir6IdtD/7lIxGeCxkaw7y45JueMRL4DIyJDKs=
+github.com/ethereum/c-kzg-4844 v1.0.0 h1:0X1LBXxaEtYD9xsyj9B9ctQEZIpnvVDeoBx8aHEwTNA=
+github.com/ethereum/c-kzg-4844 v1.0.0/go.mod h1:VewdlzQmpT5QSrVhbBuGoCdFJkpaJlO1aQputP83wc0=
+github.com/ethereum/go-ethereum v1.14.3 h1:5zvnAqLtnCZrU9uod1JCvHWJbPMURzYFHfc2eHz4PHA=
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+github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw=
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+github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
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+github.com/holiman/uint256 v1.2.4 h1:jUc4Nk8fm9jZabQuqr2JzednajVmBpC+oiTiXZJEApU=
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