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HIP-423: Long Term Scheduled Transactions (#2123)
Signed-off-by: Ivan Ivanov <ivanivanov.ii726@gmail.com>
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.../src/main/java/com/hedera/hashgraph/sdk/examples/LongTermScheduledTransactionExample.java
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| /*- | ||
| * | ||
| * Hedera Java SDK | ||
| * | ||
| * Copyright (C) 2020 - 2024 Hedera Hashgraph, LLC | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| */ | ||
| package com.hedera.hashgraph.sdk.examples; | ||
|
|
||
| import com.hedera.hashgraph.sdk.AccountBalanceQuery; | ||
| import com.hedera.hashgraph.sdk.AccountCreateTransaction; | ||
| import com.hedera.hashgraph.sdk.AccountId; | ||
| import com.hedera.hashgraph.sdk.AccountUpdateTransaction; | ||
| import com.hedera.hashgraph.sdk.Client; | ||
| import com.hedera.hashgraph.sdk.Hbar; | ||
| import com.hedera.hashgraph.sdk.KeyList; | ||
| import com.hedera.hashgraph.sdk.PrivateKey; | ||
| import com.hedera.hashgraph.sdk.ScheduleInfo; | ||
| import com.hedera.hashgraph.sdk.ScheduleInfoQuery; | ||
| import com.hedera.hashgraph.sdk.ScheduleSignTransaction; | ||
| import com.hedera.hashgraph.sdk.TransferTransaction; | ||
| import com.hedera.hashgraph.sdk.logger.LogLevel; | ||
| import com.hedera.hashgraph.sdk.logger.Logger; | ||
| import io.github.cdimascio.dotenv.Dotenv; | ||
| import java.time.Instant; | ||
| import java.util.Objects; | ||
|
|
||
| /** | ||
| * How to long term schedule transactions (HIP-423). | ||
| */ | ||
| class LongTermScheduledTransactionExample { | ||
|
|
||
| /* | ||
| * See .env.sample in the examples folder root for how to specify values below | ||
| * or set environment variables with the same names. | ||
| */ | ||
|
|
||
| /** | ||
| * Operator's account ID. Used to sign and pay for operations on Hedera. | ||
| */ | ||
| private static final AccountId OPERATOR_ID = AccountId.fromString( | ||
| Objects.requireNonNull(Dotenv.load().get("OPERATOR_ID"))); | ||
|
|
||
| /** | ||
| * Operator's private key. | ||
| */ | ||
| private static final PrivateKey OPERATOR_KEY = PrivateKey.fromString( | ||
| Objects.requireNonNull(Dotenv.load().get("OPERATOR_KEY"))); | ||
|
|
||
| /** | ||
| * HEDERA_NETWORK defaults to testnet if not specified in dotenv file. Network can be: localhost, testnet, | ||
| * previewnet or mainnet. | ||
| */ | ||
| private static final String HEDERA_NETWORK = Dotenv.load().get("HEDERA_NETWORK", "testnet"); | ||
|
|
||
| /** | ||
| * SDK_LOG_LEVEL defaults to SILENT if not specified in dotenv file. Log levels can be: TRACE, DEBUG, INFO, WARN, | ||
| * ERROR, SILENT. | ||
| * <p> | ||
| * Important pre-requisite: set simple logger log level to same level as the SDK_LOG_LEVEL, for example via VM | ||
| * options: -Dorg.slf4j.simpleLogger.log.com.hedera.hashgraph=trace | ||
| */ | ||
| private static final String SDK_LOG_LEVEL = Dotenv.load().get("SDK_LOG_LEVEL", "SILENT"); | ||
|
|
||
| public static void main(String[] args) throws Exception { | ||
| System.out.println("Long Term Scheduled Transaction Example Start!"); | ||
|
|
||
| /* | ||
| * Step 0: | ||
| * Create and configure the SDK Client. | ||
| */ | ||
| Client client = ClientHelper.forName(HEDERA_NETWORK); | ||
| // All generated transactions will be paid by this account and signed by this key. | ||
| client.setOperator(OPERATOR_ID, OPERATOR_KEY); | ||
| // Attach logger to the SDK Client. | ||
| client.setLogger(new Logger(LogLevel.valueOf(SDK_LOG_LEVEL))); | ||
|
|
||
| /* | ||
| * Step 1: | ||
| * Create key pairs | ||
| */ | ||
| var privateKey1 = PrivateKey.generateED25519(); | ||
| var publicKey1 = privateKey1.getPublicKey(); | ||
| var privateKey2 = PrivateKey.generateED25519(); | ||
|
|
||
| System.out.println("Creating a Key List..." + | ||
| "(with threshold, it will require 2 of 2 keys we generated to sign on anything modifying this account)."); | ||
| KeyList thresholdKey = KeyList.withThreshold(2); | ||
| thresholdKey.add(privateKey1); | ||
| thresholdKey.add(privateKey2); | ||
| System.out.println("Created a Key List: " + thresholdKey); | ||
|
|
||
| /* | ||
| * Step 2: | ||
| * Create the account | ||
| */ | ||
| System.out.println("Creating new account...(with the above Key List as an account key)."); | ||
| var alice = new AccountCreateTransaction() | ||
| .setKey(thresholdKey) | ||
| .setInitialBalance(new Hbar(2)) | ||
| .execute(client) | ||
| .getReceipt(client).accountId; | ||
| System.out.println("Created new account with ID: " + alice); | ||
|
|
||
| /* | ||
| * Step 3: | ||
| * Schedule a transfer transaction of 1 Hbar from the created account to the | ||
| * operator account with an expirationTime of | ||
| * 24 hours in the future and waitForExpiry=false | ||
| */ | ||
| System.out.println("Creating new scheduled transaction with 1 day expiry"); | ||
| TransferTransaction transfer = new TransferTransaction() | ||
| .addHbarTransfer(alice, new Hbar(1).negated()) | ||
| .addHbarTransfer(client.getOperatorAccountId(), new Hbar(1)); | ||
|
|
||
| int oneDayInSecs = 86400; | ||
| var scheduleId = transfer | ||
| .schedule() | ||
| .setWaitForExpiry(false) | ||
| .setExpirationTime(Instant.now().plusSeconds(oneDayInSecs)) | ||
| .execute(client) | ||
| .getReceipt(client) | ||
| .scheduleId; | ||
|
|
||
| /* | ||
| * Step 4: | ||
| * Sign the transaction with one key and verify the transaction is not executed | ||
| */ | ||
| System.out.println("Signing the new scheduled transaction with 1 key"); | ||
| new ScheduleSignTransaction() | ||
| .setScheduleId(scheduleId) | ||
| .freezeWith(client) | ||
| .sign(privateKey1) | ||
| .execute(client) | ||
| .getReceipt(client); | ||
|
|
||
| ScheduleInfo info = new ScheduleInfoQuery() | ||
| .setScheduleId(scheduleId) | ||
| .execute(client); | ||
| System.out.println("Scheduled transaction is not yet executed. Executed at: " + info.executedAt); | ||
|
|
||
| /* | ||
| * Step 5: | ||
| * Sign the transaction with the other key and verify the transaction executes successfully | ||
| */ | ||
| var accountBalance = new AccountBalanceQuery() | ||
| .setAccountId(alice) | ||
| .execute(client); | ||
| System.out.println("Alice's account balance before schedule transfer: " + accountBalance.hbars); | ||
|
|
||
| System.out.println("Signing the new scheduled transaction with the 2nd key"); | ||
| new ScheduleSignTransaction() | ||
| .setScheduleId(scheduleId) | ||
| .freezeWith(client) | ||
| .sign(privateKey2) | ||
| .execute(client) | ||
| .getReceipt(client); | ||
|
|
||
| accountBalance = new AccountBalanceQuery() | ||
| .setAccountId(alice) | ||
| .execute(client); | ||
| System.out.println("Alice's account balance after schedule transfer: " + accountBalance.hbars); | ||
|
|
||
| info = new ScheduleInfoQuery() | ||
| .setScheduleId(scheduleId) | ||
| .execute(client); | ||
| System.out.println("Scheduled transaction is executed. Executed at: " + info.executedAt); | ||
|
|
||
| /* | ||
| * Step 6: | ||
| * Schedule another transfer transaction of 1 Hbar from the account to the operator account | ||
| * with an expirationTime of 10 seconds in the future and waitForExpiry=true . | ||
| */ | ||
| System.out.println("Creating new scheduled transaction with 10 seconds expiry"); | ||
| transfer = new TransferTransaction() | ||
| .addHbarTransfer(alice, new Hbar(1).negated()) | ||
| .addHbarTransfer(client.getOperatorAccountId(), new Hbar(1)); | ||
|
|
||
| var scheduleId2 = transfer | ||
| .schedule() | ||
| .setWaitForExpiry(true) | ||
| .setExpirationTime(Instant.now().plusSeconds(10)) | ||
| .execute(client) | ||
| .getReceipt(client) | ||
| .scheduleId; | ||
| long startTime = System.currentTimeMillis(); | ||
| long elapsedTime = 0; | ||
|
|
||
| /* | ||
| * Step 7: | ||
| * Sign the transaction with one key and verify the transaction is not executed | ||
| */ | ||
| System.out.println("Signing the new scheduled transaction with 1 key"); | ||
| new ScheduleSignTransaction() | ||
| .setScheduleId(scheduleId2) | ||
| .freezeWith(client) | ||
| .sign(privateKey1) | ||
| .execute(client) | ||
| .getReceipt(client); | ||
|
|
||
| info = new ScheduleInfoQuery() | ||
| .setScheduleId(scheduleId2) | ||
| .execute(client); | ||
| System.out.println("Scheduled transaction is not yet executed. Executed at: " + info.executedAt); | ||
|
|
||
| /* | ||
| * Step 8: | ||
| * Update the account’s key to be only the one key | ||
| * that has already signed the scheduled transfer. | ||
| */ | ||
| System.out.println("Updating Alice's key to be the 1st key"); | ||
| new AccountUpdateTransaction() | ||
| .setAccountId(alice) | ||
| .setKey(publicKey1) | ||
| .freezeWith(client) | ||
| .sign(privateKey1) | ||
| .sign(privateKey2) | ||
| .execute(client) | ||
| .getReceipt(client); | ||
|
|
||
| /* | ||
| * Step 9: | ||
| * Verify that the transfer successfully executes roughly at the time of its expiration. | ||
| */ | ||
| accountBalance = new AccountBalanceQuery() | ||
| .setAccountId(alice) | ||
| .execute(client); | ||
|
|
||
| System.out.println("Alice's account balance before schedule transfer: " + accountBalance.hbars); | ||
| while (elapsedTime < 10 * 1000) { | ||
| elapsedTime = System.currentTimeMillis() - startTime; | ||
| System.out.printf("Elapsed time: %.1f seconds\r", elapsedTime / 1000.0); | ||
| Thread.sleep(100); // Pause briefly to reduce CPU usage | ||
| } | ||
| accountBalance = new AccountBalanceQuery() | ||
| .setAccountId(alice) | ||
| .execute(client); | ||
| System.out.println("Alice's account balance after schedule transfer: " + accountBalance.hbars); | ||
|
|
||
| System.out.println("Long Term Scheduled Transaction Example Complete!"); | ||
| } | ||
| } |
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