feat: Mirror Node Contract Queries

contract_function_parameters.go

@@ -8,6 +8,7 @@
 	"errors"
 	"fmt"
 	"math/big"
+	"strings"
 )
 
 // ContractFunctionParameters is a struct which builds a solidity function call
@@ -1718,8 +1719,9 @@
 
 // AddAddress adds an address parameter to the function call
 func (contract *ContractFunctionParameters) AddAddress(value string) (*ContractFunctionParameters, error) {
+	value = strings.TrimPrefix(value, "0x")
 	if len(value) != 40 {
-		return contract, errors.Unwrap(fmt.Errorf("address is required to be 40 characters"))
+		return contract, fmt.Errorf("address is required to be 40 characters")
 	}
 
 	addressBytes, err := hex.DecodeString(value)

contract_function_parameters_e2e_test.go

@@ -304,6 +304,9 @@ func TestUint8Min(t *testing.T) {
 	defer CloseIntegrationTestEnv(env, nil)
 	deployContract(env)
 	value := uint8(0)
+	gas, err := NewMirrorNodeContractEstimateGasQuery().
+		SetContractID(contractID).SetFunction("returnUint8", NewContractFunctionParameters().AddUint8(value)).Execute(env.Client)
+	require.NoError(t, err)
 	contractCal, err := NewContractCallQuery().SetGas(gas).SetQueryPayment(NewHbar(1)).
 		SetContractID(contractID).SetFunction("returnUint8", NewContractFunctionParameters().AddUint8(value)).SetMaxQueryPayment(NewHbar(20)).Execute(env.Client)
 	require.NoError(t, err)
@@ -315,6 +318,9 @@ func TestUint8Max(t *testing.T) {
 	defer CloseIntegrationTestEnv(env, nil)
 	deployContract(env)
 	value := uint8(255)
+	gas, err := NewMirrorNodeContractEstimateGasQuery().
+		SetContractID(contractID).SetFunction("returnUint8", NewContractFunctionParameters().AddUint8(value)).Execute(env.Client)
+	require.NoError(t, err)
 	contractCal, err := NewContractCallQuery().SetGas(gas).SetQueryPayment(NewHbar(1)).
 		SetContractID(contractID).SetFunction("returnUint8", NewContractFunctionParameters().AddUint8(value)).SetMaxQueryPayment(NewHbar(20)).Execute(env.Client)
 	require.NoError(t, err)
@@ -327,6 +333,8 @@ func TestUint16Min(t *testing.T) {
 	defer CloseIntegrationTestEnv(env, nil)
 	deployContract(env)
 	value := uint16(0)
+	gas, err := NewMirrorNodeContractEstimateGasQuery().
+		SetContractID(contractID).SetFunction("returnUint16", NewContractFunctionParameters().AddUint16(value)).Execute(env.Client)
 	contractCal, err := NewContractCallQuery().SetGas(gas).SetQueryPayment(NewHbar(1)).
 		SetContractID(contractID).SetFunction("returnUint16", NewContractFunctionParameters().AddUint16(value)).SetMaxQueryPayment(NewHbar(20)).Execute(env.Client)
 	require.NoError(t, err)
@@ -339,6 +347,8 @@ func TestUint16Max(t *testing.T) {
 	defer CloseIntegrationTestEnv(env, nil)
 	deployContract(env)
 	value := uint16(65535)
+	gas, err := NewMirrorNodeContractEstimateGasQuery().
+		SetContractID(contractID).SetFunction("returnUint16", NewContractFunctionParameters().AddUint16(value)).Execute(env.Client)
 	contractCal, err := NewContractCallQuery().SetGas(gas).SetQueryPayment(NewHbar(1)).
 		SetContractID(contractID).SetFunction("returnUint16", NewContractFunctionParameters().AddUint16(value)).SetMaxQueryPayment(NewHbar(20)).Execute(env.Client)
 	require.NoError(t, err)
@@ -1656,6 +1666,10 @@ func TestAddress(t *testing.T) {
 	value := "1234567890123456789012345678901234567890"
 	params, err := NewContractFunctionParameters().AddAddress(value)
 	require.NoError(t, err)
+	gas, err := NewMirrorNodeContractEstimateGasQuery().
+		SetContractID(contractID).SetFunction("returnAddress", params).Execute(env.Client)
+	require.NoError(t, err)
+
 	contractCal := NewContractCallQuery().SetGas(gas).SetQueryPayment(NewHbar(1)).
 		SetContractID(contractID).SetFunction("returnAddress", params)
 	result, err := contractCal.Execute(env.Client)

crypto_unit_test.go

@@ -661,7 +661,6 @@ func TestUnitPrivateKeyFromBytesDerECDSAUncompressed(t *testing.T) {
 	require.NoError(t, err)
 	key2, err := PrivateKeyFromBytesDer(bytes)
 	require.NoError(t, err)
-	fmt.Printf("key2.String(): %v\n", key2.String())
 	require.True(t, strings.HasPrefix(key2.String(), _ECDSAPrivatePrefix))
 }
 

examples/mirror_node_contract_queries/main.go

@@ -0,0 +1,191 @@
+package main
+
+import (
+	"encoding/hex"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/hiero-ledger/hiero-sdk-go/v2"
+)
+
+var contractBytecode = "60806040526040518060400160405280600581526020017f68656c6c6f0000000000000000000000000000000000000000000000000000008152505f90816100479190610293565b50348015610053575f80fd5b50610362565b5f81519050919050565b7f4e487b71000000000000000000000000000000000000000000000000000000005f52604160045260245ffd5b7f4e487b71000000000000000000000000000000000000000000000000000000005f52602260045260245ffd5b5f60028204905060018216806100d457607f821691505b6020821081036100e7576100e6610090565b5b50919050565b5f819050815f5260205f209050919050565b5f6020601f8301049050919050565b5f82821b905092915050565b5f600883026101497fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff8261010e565b610153868361010e565b95508019841693508086168417925050509392505050565b5f819050919050565b5f819050919050565b5f61019761019261018d8461016b565b610174565b61016b565b9050919050565b5f819050919050565b6101b08361017d565b6101c46101bc8261019e565b84845461011a565b825550505050565b5f90565b6101d86101cc565b6101e38184846101a7565b505050565b5b81811015610206576101fb5f826101d0565b6001810190506101e9565b5050565b601f82111561024b5761021c816100ed565b610225846100ff565b81016020851015610234578190505b610248610240856100ff565b8301826101e8565b50505b505050565b5f82821c905092915050565b5f61026b5f1984600802610250565b1980831691505092915050565b5f610283838361025c565b9150826002028217905092915050565b61029c82610059565b67ffffffffffffffff8111156102b5576102b4610063565b5b6102bf82546100bd565b6102ca82828561020a565b5f60209050601f8311600181146102fb575f84156102e9578287015190505b6102f38582610278565b86555061035a565b601f198416610309866100ed565b5f5b828110156103305784890151825560018201915060208501945060208101905061030b565b8683101561034d5784890151610349601f89168261025c565b8355505b6001600288020188555050505b505050505050565b6102178061036f5f395ff3fe608060405234801561000f575f80fd5b5060043610610029575f3560e01c8063ce6d41de1461002d575b5f80fd5b61003561004b565b6040516100429190610164565b60405180910390f35b60605f8054610059906101b1565b80601f0160208091040260200160405190810160405280929190818152602001828054610085906101b1565b80156100d05780601f106100a7576101008083540402835291602001916100d0565b820191905f5260205f20905b8154815290600101906020018083116100b357829003601f168201915b5050505050905090565b5f81519050919050565b5f82825260208201905092915050565b5f5b838110156101115780820151818401526020810190506100f6565b5f8484015250505050565b5f601f19601f8301169050919050565b5f610136826100da565b61014081856100e4565b93506101508185602086016100f4565b6101598161011c565b840191505092915050565b5f6020820190508181035f83015261017c818461012c565b905092915050565b7f4e487b71000000000000000000000000000000000000000000000000000000005f52602260045260245ffd5b5f60028204905060018216806101c857607f821691505b6020821081036101db576101da610184565b5b5091905056fea26469706673582212202a86c27939bfab6d4a2c61ebbf096d8424e17e22dfdd42320f6e2654863581e964736f6c634300081a0033"
+
+/**
+ * @summary Mirror Node Contract Queries for estimation or simulation of transactions
+ */
+func main() {
+	var client *hiero.Client
+	var err error
+
+	// Retrieving network type from environment variable HEDERA_NETWORK
+	client, err = hiero.ClientForName(os.Getenv("HEDERA_NETWORK"))
+	if err != nil {
+		panic(fmt.Sprintf("%v : error creating client", err))
+	}
+
+	// Retrieving operator ID from environment variable OPERATOR_ID
+	operatorAccountID, err := hiero.AccountIDFromString(os.Getenv("OPERATOR_ID"))
+	if err != nil {
+		panic(fmt.Sprintf("%v : error converting string to AccountID", err))
+	}
+
+	// Retrieving operator key from environment variable OPERATOR_KEY
+	operatorKey, err := hiero.PrivateKeyFromString(os.Getenv("OPERATOR_KEY"))
+	if err != nil {
+		panic(fmt.Sprintf("%v : error converting string to PrivateKey", err))
+	}
+
+	// Setting the client operator ID and key
+	client.SetOperator(operatorAccountID, operatorKey)
+
+	fmt.Println("Example Start!")
+
+	/*
+	 * Step 1: Create a contract
+	 */
+
+	hexBytecode, err := hex.DecodeString(contractBytecode)
+	if err != nil {
+		panic(fmt.Sprintf("%v : error decoding bytecode", err))
+	}
+
+	resp, err := hiero.NewContractCreateTransaction().
+		SetBytecode(hexBytecode).
+		SetGas(2000000).
+		SetTransactionMemo("Create a simple contract instance").
+		Execute(client)
+	if err != nil {
+		panic(fmt.Sprintf("%v : error creating contract", err))
+	}
+
+	receipt, err := resp.GetReceipt(client)
+	if err != nil {
+		panic(fmt.Sprintf("%v : error retrieving receipt", err))
+	}
+	contractId := receipt.ContractID
+	fmt.Println("Created new contract with ID: ", contractId)
+
+	/*
+	 * Step 2: Wait for mirror node to import data
+	 */
+	time.Sleep(5 * time.Second)
+
+	/*
+	 * Step 3: Estimate the gas needed
+	 */
+	gas, err := hiero.NewMirrorNodeContractEstimateGasQuery().
+		SetContractID(*contractId).
+		SetSender(operatorAccountID).
+		SetGasLimit(30_000).
+		SetGasPrice(1234).
+		SetFunction("getMessage", nil).
+		Execute(client)
+	if err != nil {
+		panic(fmt.Sprintf("%v : error estimating gas", err))
+	}
+
+	fmt.Printf("Gas needed for this query: %v\n", gas)
+
+	/*
+	 * Step 4: Do the query against the consensus node using the estimated gas
+	 */
+
+	_, err = hiero.NewContractCallQuery().
+		SetContractID(*contractId).
+		SetGas(gas).
+		SetFunction("getMessage", nil).
+		Execute(client)
+
+	if err != nil {
+		panic(fmt.Sprintf("%v : error executing contract call query", err))
+	}
+
+	/*
+	 * Step 5: Simulate the transaction for free, using the mirror node
+	 */
+
+	result, err := hiero.NewMirrorNodeContractCallQuery().
+		SetContractID(*contractId).
+		SetSender(operatorAccountID).
+		SetGasLimit(30_000).
+		SetGasPrice(1234).
+		SetBlockNumber(10000).
+		SetFunction("getMessage", nil).
+		Execute(client)
+	if err != nil {
+		panic(fmt.Sprintf("%v : error during contract call", err))
+	}
+
+	decodedResult, err := DecodeABIHexString(result)
+	if err != nil {
+		panic(fmt.Sprintf("%v : error decoding result", err))
+	}
+
+	fmt.Println("Simulation result: ", decodedResult)
+	fmt.Println("Contract call result: ", decodedResult)
+
+	/*
+	 * Clean up:
+	 */
+	client.Close()
+
+	fmt.Println("Example Complete!")
+
+}
+
+// DecodeABIHexString decodes a hex-encoded ABI (Application Binary Interface) string into a UTF-8 string.
+// It assumes the input follows the ABI encoding standard for dynamic data.
+func DecodeABIHexString(hexStr string) (string, error) {
+	// Remove the `0x` prefix if present
+	hexStr = strings.TrimPrefix(hexStr, "0x")
+
+	// Ensure the input has at least 128 characters (for metadata and length)
+	if len(hexStr) < 128 {
+		return "", fmt.Errorf("input hex string is too short")
+	}
+
+	// Parse the length of the dynamic data (64 to 128) as a hexadecimal integer
+	lengthHex := hexStr[64:128]
+	length, err := parseHexToInt(lengthHex)
+	if err != nil {
+		return "", fmt.Errorf("failed to parse length from hex string: %w", err)
+	}
+
+	// Calculate the start and end index for the dynamic data
+	startIndex := 128
+	endIndex := startIndex + length*2
+	if len(hexStr) < endIndex {
+		return "", fmt.Errorf("input hex string is too short for the expected dynamic data")
+	}
+
+	// Extract the dynamic data substring
+	hexData := hexStr[startIndex:endIndex]
+
+	// Convert the hex data to bytes
+	bytes, err := hex.DecodeString(hexData)
+	if err != nil {
+		return "", fmt.Errorf("failed to decode hex data: %w", err)
+	}
+
+	// Convert the bytes to a UTF-8 string and return
+	return string(bytes), nil
+}
+
+// parseHexToInt parses a hexadecimal string into an integer
+func parseHexToInt(hexStr string) (int, error) {
+	if len(hexStr) == 0 {
+		return 0, fmt.Errorf("empty hex string")
+	}
+	parsed, err := hex.DecodeString(hexStr)
+	if err != nil {
+		return 0, err
+	}
+	// Convert parsed bytes to an integer
+	result := 0
+	for _, b := range parsed {
+		result = result*256 + int(b)
+	}
+	return result, nil
+}

mirror_node_contract_call_query.go

@@ -0,0 +1,83 @@
+package hiero
+
+// SPDX-License-Identifier: Apache-2.0
+
+// MirrorNodeContractCallQuery returns a result from EVM transient simulation of read-write operations.
+type MirrorNodeContractCallQuery struct {
+	mirrorNodeContractQuery
+}
+
+func NewMirrorNodeContractCallQuery() *MirrorNodeContractCallQuery {
+	mirrorNodeContractCallQuery := new(MirrorNodeContractCallQuery)
+	return mirrorNodeContractCallQuery
+}
+
+// SetContractID sets the contract instance to call.
+func (mirrorNodeContractCallQuery *MirrorNodeContractCallQuery) SetContractID(contractID ContractID) *MirrorNodeContractCallQuery {
+	mirrorNodeContractCallQuery.contractID = &contractID
+	return mirrorNodeContractCallQuery
+}
+
+// SetContractEvmAddress sets the 20-byte EVM address of the contract to call.
+func (mirrorNodeContractCallQuery *MirrorNodeContractCallQuery) SetContractEvmAddress(contractEvmAddress string) *MirrorNodeContractCallQuery {
+	mirrorNodeContractCallQuery.contractEvmAddress = &contractEvmAddress
+	mirrorNodeContractCallQuery.contractID = nil
+	return mirrorNodeContractCallQuery
+}
+
+// SetSender sets the sender of the transaction simulation.
+func (mirrorNodeContractCallQuery *MirrorNodeContractCallQuery) SetSender(sender AccountID) *MirrorNodeContractCallQuery {
+	mirrorNodeContractCallQuery.sender = &sender
+	return mirrorNodeContractCallQuery
+}
+
+// SetSenderEvmAddress sets the 20-byte EVM address of the sender of the transaction simulation.
+func (mirrorNodeContractCallQuery *MirrorNodeContractCallQuery) SetSenderEvmAddress(senderEvmAddress string) *MirrorNodeContractCallQuery {
+	mirrorNodeContractCallQuery.senderEvmAddress = &senderEvmAddress
+	mirrorNodeContractCallQuery.sender = nil
+	return mirrorNodeContractCallQuery
+}
+
+// SetFunction sets the function parameters as their raw bytes.
+func (mirrorNodeContractCallQuery *MirrorNodeContractCallQuery) SetFunction(name string, params *ContractFunctionParameters) *MirrorNodeContractCallQuery {
+	mirrorNodeContractCallQuery.setFunction(name, params)
+	return mirrorNodeContractCallQuery
+}
+
+// SetFunction sets the function parameters as their raw bytes.
+func (mirrorNodeContractCallQuery *MirrorNodeContractCallQuery) SetFunctionParameters(byteArray []byte) *MirrorNodeContractCallQuery {
+	mirrorNodeContractCallQuery.callData = byteArray
+	return mirrorNodeContractCallQuery
+}
+
+// SetValue sets the amount of value (in tinybars or wei) to be sent to the contract in the transaction.
+func (mirrorNodeContractCallQuery *MirrorNodeContractCallQuery) SetValue(value int64) *MirrorNodeContractCallQuery {
+	mirrorNodeContractCallQuery.value = &value
+	return mirrorNodeContractCallQuery
+}
+
+// SetGasLimit sets the gas limit for the contract call.
+// This specifies the maximum amount of gas that the transaction can consume.
+func (mirrorNodeContractCallQuery *MirrorNodeContractCallQuery) SetGasLimit(gasLimit int64) *MirrorNodeContractCallQuery {
+	mirrorNodeContractCallQuery.gasLimit = &gasLimit
+	return mirrorNodeContractCallQuery
+}
+
+// SetGasPrice sets the gas price to be used for the contract call.
+// This specifies the price of each unit of gas used in the transaction.
+func (mirrorNodeContractCallQuery *MirrorNodeContractCallQuery) SetGasPrice(gasPrice int64) *MirrorNodeContractCallQuery {
+	mirrorNodeContractCallQuery.gasPrice = &gasPrice
+	return mirrorNodeContractCallQuery
+}
+
+// SetBlockNumber sets the block number for the simulation of the contract call.
+// The block number determines the context of the contract call simulation within the blockchain.
+func (mirrorNodeContractCallQuery *MirrorNodeContractCallQuery) SetBlockNumber(blockNumber int64) *MirrorNodeContractCallQuery {
+	mirrorNodeContractCallQuery.blockNumber = &blockNumber
+	return mirrorNodeContractCallQuery
+}
+
+// Does transient simulation of read-write operations and returns the result in hexadecimal string format.
+func (mirrorNodeContractCallQuery *MirrorNodeContractCallQuery) Execute(client *Client) (string, error) {
+	return mirrorNodeContractCallQuery.call(client)
+}