unstoppabledomains / headlong Goto Github PK

Function f = new Function("baz(uint32,bool)"); // canonicalizes and parses any signature
// or
Function f2 = Function.fromJson("{\"type\":\"function\",\"name\":\"foo\",\"inputs\":[{\"name\":\"complex_nums\",\"type\":\"tuple[]\",\"components\":[{\"name\":\"real\",\"type\":\"decimal\"},{\"name\":\"imaginary\",\"type\":\"decimal\"}]}]}");

Tuple args = new Tuple(69L, true);

// Two equivalent styles:
ByteBuffer one = f.encodeCall(args);
ByteBuffer two = f.encodeCallWithArgs(69L, true);

System.out.println(Function.formatCall(one.array())); // a multi-line hex representation
System.out.println(f.decodeCall((ByteBuffer) two.flip()).equals(args));

Function foo = new Function("foo((fixed[],int8)[1][][5])", "(ufixed,string)");

// decode return type (ufixed,string)
Tuple decoded = foo.decodeReturn(
        FastHex.decode(
                "0000000000000000000000000000000000000000000000000000000000000045"
              + "0000000000000000000000000000000000000000000000000000000000000020"
              + "0000000000000000000000000000000000000000000000000000000000000004"
              + "7730307400000000000000000000000000000000000000000000000000000000"
        )
);
        
System.out.println(decoded.equals(new Tuple(new BigDecimal(BigInteger.valueOf(69L), 18), "w00t")));

// for an example class Student
public Student(byte[] rlp) {
    Iterator<RLPItem> iter = RLP_STRICT.sequenceIterator(rlp);
    
    this.name = iter.next().asString(UTF_8);
    this.gpa = iter.next().asFloat();
    this.publicKey = iter.next().asBytes();
    this.balance = new BigDecimal(iter.next().asBigInt(), iter.next().asInt());
}

@Override
public Object[] toObjectArray() {
    return new Object[] {
            // instances of byte[]
            Strings.decode(name, UTF_8),
            FloatingPoint.toBytes(gpa),
            publicKey,
            balance.unscaledValue().toByteArray(),
            Integers.toBytes(balance.scale())
            // include an Object[] or Iterable and its elements will be encoded as an RLP list (which may include other lists)
    };
}

@Override
public byte[] toRLP() {
    return RLPEncoder.encodeSequentially(toObjectArray());
}