feat: add example for estimates from mirror node

Signed-off-by: Ivaylo Nikolov <[email protected]>

examples/mirror-node-contract-queries-example.js

@@ -0,0 +1,97 @@
+import ABI from "@ethersproject/abi";
+import {
+    PrivateKey,
+    MirrorNodeContractCallQuery,
+    MirrorNodeContractEstimateQuery,
+    ContractCallQuery,
+    Hbar,
+    ContractCreateTransaction,
+    Client,
+    ContractFunctionParameters,
+    AccountId,
+    FileCreateTransaction,
+    Long,
+} from "@hashgraph/sdk";
+import { setTimeout } from "timers/promises";
+import dotenv from "dotenv";
+
+dotenv.config();
+
+const OPERATOR_ID = AccountId.fromString(process.env.OPERATOR_ID);
+const OPERATOR_KEY = PrivateKey.fromStringECDSA(process.env.OPERATOR_KEY);
+const HEDERA_NETWORK = process.env.HEDERA_NETWORK || "testnet";
+
+async function main() {
+    console.log("Mirror Node contract queries Example Start!");
+
+    // Step 0: Create and configure the SDK Client.
+    const client = Client.forName(HEDERA_NETWORK);
+    client.setOperator(OPERATOR_ID, OPERATOR_KEY);
+
+    const BYTECODE =
+        "60806040526040518060400160405280600581526020017f68656c6c6f0000000000000000000000000000000000000000000000000000008152505f90816100479190610293565b50348015610053575f80fd5b50610362565b5f81519050919050565b7f4e487b71000000000000000000000000000000000000000000000000000000005f52604160045260245ffd5b7f4e487b71000000000000000000000000000000000000000000000000000000005f52602260045260245ffd5b5f60028204905060018216806100d457607f821691505b6020821081036100e7576100e6610090565b5b50919050565b5f819050815f5260205f209050919050565b5f6020601f8301049050919050565b5f82821b905092915050565b5f600883026101497fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff8261010e565b610153868361010e565b95508019841693508086168417925050509392505050565b5f819050919050565b5f819050919050565b5f61019761019261018d8461016b565b610174565b61016b565b9050919050565b5f819050919050565b6101b08361017d565b6101c46101bc8261019e565b84845461011a565b825550505050565b5f90565b6101d86101cc565b6101e38184846101a7565b505050565b5b81811015610206576101fb5f826101d0565b6001810190506101e9565b5050565b601f82111561024b5761021c816100ed565b610225846100ff565b81016020851015610234578190505b610248610240856100ff565b8301826101e8565b50505b505050565b5f82821c905092915050565b5f61026b5f1984600802610250565b1980831691505092915050565b5f610283838361025c565b9150826002028217905092915050565b61029c82610059565b67ffffffffffffffff8111156102b5576102b4610063565b5b6102bf82546100bd565b6102ca82828561020a565b5f60209050601f8311600181146102fb575f84156102e9578287015190505b6102f38582610278565b86555061035a565b601f198416610309866100ed565b5f5b828110156103305784890151825560018201915060208501945060208101905061030b565b8683101561034d5784890151610349601f89168261025c565b8355505b6001600288020188555050505b505050505050565b6102178061036f5f395ff3fe608060405234801561000f575f80fd5b5060043610610029575f3560e01c8063ce6d41de1461002d575b5f80fd5b61003561004b565b6040516100429190610164565b60405180910390f35b60605f8054610059906101b1565b80601f0160208091040260200160405190810160405280929190818152602001828054610085906101b1565b80156100d05780601f106100a7576101008083540402835291602001916100d0565b820191905f5260205f20905b8154815290600101906020018083116100b357829003601f168201915b5050505050905090565b5f81519050919050565b5f82825260208201905092915050565b5f5b838110156101115780820151818401526020810190506100f6565b5f8484015250505050565b5f601f19601f8301169050919050565b5f610136826100da565b61014081856100e4565b93506101508185602086016100f4565b6101598161011c565b840191505092915050565b5f6020820190508181035f83015261017c818461012c565b905092915050565b7f4e487b71000000000000000000000000000000000000000000000000000000005f52602260045260245ffd5b5f60028204905060018216806101c857607f821691505b6020821081036101db576101da610184565b5b5091905056fea26469706673582212202a86c27939bfab6d4a2c61ebbf096d8424e17e22dfdd42320f6e2654863581e964736f6c634300081a0033";
+
+    const { fileId } = await (
+        await new FileCreateTransaction().setContents(BYTECODE).execute(client)
+    ).getReceipt(client);
+
+    const { contractId } = await (
+        await new ContractCreateTransaction()
+            .setBytecodeFileId(fileId)
+            .setGas(200000)
+            .execute(client)
+    ).getReceipt(client);
+
+    console.log("Created new contract with ID: " + contractId.toString());
+
+    // Step 3: Wait for mirror node to import data
+    await setTimeout(5000);
+
+    const gasLimit = Long.fromNumber(30000);
+    const gasPrice = Long.fromNumber(1234);
+
+    // Step 4: Estimate the gas needed
+    const gas = await new MirrorNodeContractEstimateQuery()
+        .setContractId(contractId)
+        .setSender(client.operatorAccountId)
+        .setGasLimit(gasLimit)
+        .setGasPrice(gasPrice)
+        .setFunction("getMessage", new ContractFunctionParameters())
+        .execute();
+
+    // Step 5: Do the query against the consensus node using the estimated gas
+    const callQuery = new ContractCallQuery()
+        .setContractId(contractId)
+        .setGas(gas)
+        .setFunction("getMessage")
+        .setQueryPayment(new Hbar(1));
+
+    const result = await callQuery.execute(client);
+
+    // Step 6: Simulate the transaction for free, using the mirror node
+    const simulationResult = await new MirrorNodeContractCallQuery()
+        .setContractId(contractId)
+        .setSender(client.operatorAccountId)
+        .setGasLimit(Long.fromString("30000"))
+        .setBlockNumber(Long.fromString("10000"))
+        .setGasPrice(Long.fromString("1234"))
+        .setFunction("getMessage", new ContractFunctionParameters())
+        .execute();
+
+    // need to do this to remove the readonly property of the array
+    /**
+     * @type {string[]}
+     */
+    const decodedSimulationResult = ABI.defaultAbiCoder
+        .decode(["string"], simulationResult)
+        .concat();
+
+    /**
+     * @type {string}
+     */
+    const decodedStringMessage = decodedSimulationResult[0];
+    console.log("Simulation result: " + decodedStringMessage);
+    console.log("Contract call result: " + result.getString(0));
+}
+
+void main();