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https://github.com/wavesplatform/WavesJ
Java library for interacting with the Waves blockchain.
https://github.com/wavesplatform/WavesJ
blockchain cryptography java-library
Last synced: 27 days ago
JSON representation
Java library for interacting with the Waves blockchain.
- Host: GitHub
- URL: https://github.com/wavesplatform/WavesJ
- Owner: wavesplatform
- License: mit
- Created: 2017-11-23T08:50:52.000Z (about 7 years ago)
- Default Branch: master
- Last Pushed: 2024-03-06T07:50:15.000Z (9 months ago)
- Last Synced: 2024-04-15T00:16:49.709Z (8 months ago)
- Topics: blockchain, cryptography, java-library
- Language: Java
- Homepage:
- Size: 708 KB
- Stars: 44
- Watchers: 25
- Forks: 32
- Open Issues: 15
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
- awesome-waves - WavesJ - Java library to interact with the Waves blockchain and DEX. (Frameworks and tools / Client libraries)
README
[](https://search.maven.org/artifact/com.wavesplatform/wavesj)
# WavesJ
A Java library for interacting with the Waves blockchain.
Supports node interaction, offline transaction signing and creating addresses and keys.
## Using WavesJ in your project
Use the codes below to add WavesJ as a dependency for your project.
##### Requirements:
- JDK 1.8 or above
##### Maven:
```
com.wavesplatform
wavesj
1.3.0
```
##### Gradle:
```
compile group: 'com.wavesplatform', name: 'wavesj', version: '1.3.0'
```
##### SBT:
```
libraryDependencies += "com.wavesplatform" % "wavesj" % "1.3.0"
```
[This library's page at Maven Central](https://mvnrepository.com/artifact/com.wavesplatform/wavesj)
### Getting started
Create an account from a private key ('T' for testnet) from random seed phrase:
```java
String seed = Crypto.getRandomSeedPhrase();
PrivateKey privateKey = PrivateKey.fromSeed(seed);
PublicKey publicKey = PublicKey.from(privateKey);
Address address = Address.from(publicKey);
```
Create a Node and learn a few things about blockchain:
```java
Node node = new Node(Profile.MAINNET);
System.out.println("Current height is " + node.getHeight());
System.out.println("My balance is " + node.getBalance(address));
System.out.println("With 100 confirmations: " + node.getBalance(address, 100));
```
Send some money to a buddy:
```java
Address buddy = new Address("3N9gDFq8tKFhBDBTQxR3zqvtpXjw5wW3syA");
node.broadcast(TransferTransaction.builder(buddy, Amount.of(1_00000000, Asset.WAVES)).getSignedWith(privateKey));
```
Set a script on an account. Be careful with the script you pass here, as it may lock the account forever!
```java
Base64String script = node
.compile("{-# CONTENT_TYPE EXPRESSION #-} sigVerify(tx.bodyBytes, tx.proofs[0], tx.senderPublicKey)")
.script();
node.broadcast(new SetScriptTransaction(publicKey, script).addProof(privateKey));
```
### Reading transaction info
[Same transaction from REST API](https://nodes-stagenet.wavesnodes.com/transactions/info/CWuFY42te67sLmc5gwt4NxwHmFjVfJdHkKuLyshTwEct)
```java
Id ethTxId = new Id("CWuFY42te67sLmc5gwt4NxwHmFjVfJdHkKuLyshTwEct");
EthereumTransactionInfo ethInvokeTxInfo = node.getTransactionInfo(ethTxId, EthereumTransactionInfo.class);
EthereumTransaction ethInvokeTx = ethInvokeTxInfo.tx();
EthereumTransaction.Invocation payload = (EthereumTransaction.Invocation) ethInvokeTx.payload();
System.out.println("is ethereum invoke transaction: " + ethInvokeTxInfo.isInvokeTransaction());
System.out.println("type: " + ethInvokeTx.type());
System.out.println("id: " + ethInvokeTx.id().encoded());
System.out.println("fee: " + ethInvokeTx.fee().value());
System.out.println("feeAssetId: " + ethInvokeTx.fee().assetId().encoded());
System.out.println("timestamp: " + ethInvokeTx.timestamp());
System.out.println("version: " + ethInvokeTx.version());
System.out.println("chainId: " + ethInvokeTx.chainId());
System.out.println("bytes: " + ethInvokeTxInfo.getBytes());
System.out.println("sender: " + ethInvokeTx.sender().address().encoded());
System.out.println("senderPublicKey: " + ethInvokeTx.sender().encoded());
System.out.println("height: " + ethInvokeTxInfo.height());
System.out.println("applicationStatus: " + ethInvokeTxInfo.applicationStatus());
System.out.println("payload dApp: " + payload.dApp().encoded());
System.out.println("payload call function: " + payload.function().name());
List args = payload.function().args();
System.out.println("payload call function arguments type: " + args.get(0).type());
System.out.println("payload call function arguments value: " + ((StringArg) args.get(0)).value());
DataEntry dataEntry = ethInvokeTxInfo.getStateChanges().data().get(0);
System.out.println("state changes data key: " + dataEntry.key());
System.out.println("state changes data type: " + dataEntry.type().name());
System.out.println("state changes data value: " + ((StringEntry) dataEntry).value());
```
### Broadcasting transactions
#### Creating accounts (see Getting started for more info about account creation)
```java
PrivateKey alice = createAccountWithBalance(10_00000000);
PrivateKey bob = createAccountWithBalance(10_00000000);
```
#### Broadcasting exchange transaction
```java
AssetId assetId = node.waitForTransaction(node.broadcast(
IssueTransaction.builder("Asset", 1000, 2).getSignedWith(alice)).id(),
IssueTransactionInfo.class).tx().assetId();
Amount amount = Amount.of(1);
Amount price = Amount.of(100, assetId);
long matcherFee = 300000;
Order buy = Order.builder(OrderType.BUY, amount, price, alice.publicKey()).getSignedWith(alice);
Order sell = Order.builder(OrderType.SELL, amount, price, alice.publicKey()).getSignedWith(bob);
ExchangeTransaction tx = ExchangeTransaction
.builder(buy, sell, amount.value(), price.value(), matcherFee, matcherFee).getSignedWith(alice);
node.waitForTransaction(node.broadcast(tx).id());
TransactionInfo commonInfo = node.getTransactionInfo(tx.id());
ExchangeTransactionInfo txInfo = node.getTransactionInfo(tx.id(), ExchangeTransactionInfo.class);
```
### Working with dApp
#### Creating accounts (see Getting started for more info about account creation)
```java
PrivateKey alice = createAccountWithBalance(10_00000000);
PrivateKey bob = createAccountWithBalance(10_00000000);
```
#### Broadcasting issue transaction
```java
AssetId assetId = node.waitForTransaction(node.broadcast(
IssueTransaction.builder("Asset", 1000, 2).getSignedWith(alice)).id(),
IssueTransactionInfo.class).tx().assetId();
```
#### Compiling and broadcasting RIDE script
```java
Base64String script = node.compileScript(
"{-# STDLIB_VERSION 5 #-}\n" +
"{-# CONTENT_TYPE DAPP #-}\n" +
"{-# SCRIPT_TYPE ACCOUNT #-}\n" +
"@Callable(inv)\n" +
"func call(bv: ByteVector, b: Boolean, int: Int, str: String, list: List[Int]) = {\n" +
" let asset = Issue(\"Asset\", \"\", 1, 0, true)\n" +
" let assetId = asset.calculateAssetId()\n" +
" let lease = Lease(inv.caller, 7)\n" +
" let leaseId = lease.calculateLeaseId()\n" +
" [\n" +
" BinaryEntry(\"bin\", assetId),\n" +
" BooleanEntry(\"bool\", true),\n" +
" IntegerEntry(\"int\", 100500),\n" +
" StringEntry(\"assetId\", assetId.toBase58String()),\n" +
" StringEntry(\"leaseId\", leaseId.toBase58String()),\n" +
" StringEntry(\"del\", \"\"),\n" +
" DeleteEntry(\"del\"),\n" +
" asset,\n" +
" SponsorFee(assetId, 1),\n" +
" Reissue(assetId, 4, false),\n" +
" Burn(assetId, 3),\n" +
" ScriptTransfer(inv.caller, 2, assetId),\n" +
" lease,\n" +
" LeaseCancel(lease.calculateLeaseId())\n" +
" ]\n" +
"}").script();
node.waitForTransaction(node.broadcast(
SetScriptTransaction.builder(script).getSignedWith(bob)).id());
```
#### Calling dApp
```java
InvokeScriptTransaction tx = InvokeScriptTransaction
.builder(bob.address(), Function.as("call",
BinaryArg.as(alice.address().bytes()),
BooleanArg.as(true),
IntegerArg.as(100500),
StringArg.as(alice.address().toString()),
ListArg.as(IntegerArg.as(100500))
)).payments(
Amount.of(1, assetId),
Amount.of(2, assetId),
Amount.of(3, assetId),
Amount.of(4, assetId),
Amount.of(5, assetId),
Amount.of(6, assetId),
Amount.of(7, assetId),
Amount.of(8, assetId),
Amount.of(9, assetId),
Amount.of(10, assetId)
).extraFee(1_00000000)
.getSignedWith(alice);
node.waitForTransaction(node.broadcast(tx).id());
```
#### Receiving invoke script transaction info
```java
TransactionInfo commonInfo = node.getTransactionInfo(tx.id());
InvokeScriptTransactionInfo txInfo = node.getTransactionInfo(tx.id(), InvokeScriptTransactionInfo.class);
```