Examples with FixedPoint org.aion.util.math.FixedPoint used on opensource projects

Example 1 with FixedPoint

use of org.aion.util.math.FixedPoint in project aion by aionnetwork.

the class StakingBlockTimeStampRule method validate.

@Override
public boolean validate(BlockHeader header, BlockHeader dependency, List<RuleError> errors, Object stake) {
    if (!(header instanceof StakingBlockHeader)) {
        BlockHeaderValidatorUtil.addError("Invalid header type", this.getClass(), errors);
        return false;
    }
    if (dependency instanceof StakingBlockHeader) {
        BlockHeaderValidatorUtil.addError("Invalid parent header type", this.getClass(), errors);
        return false;
    }
    if (stake == null) {
        BlockHeaderValidatorUtil.addError("The stake can not be null", this.getClass(), errors);
        return false;
    }
    if (!(stake instanceof BigInteger)) {
        BlockHeaderValidatorUtil.addError("Invalid stake object type", this.getClass(), errors);
        return false;
    }
    long parentTimeStamp = dependency.getTimestamp();
    BigInteger stakes = (BigInteger) stake;
    if (stakes.signum() < 1) {
        return false;
    }
    long timeStamp = header.getTimestamp();
    BigInteger blockDifficulty = header.getDifficultyBI();
    byte[] seed = ((StakingBlockHeader) header).getSeedOrProof();
    if (seed.length == StakingBlockHeader.PROOF_LENGTH) {
        seed = VRF_Ed25519.generateProofHash(seed);
    }
    BigInteger dividend = new BigInteger(1, HashUtil.h256(seed));
    FixedPoint logDifference = logBoundary.subtract(LogApproximator.log(dividend));
    BigInteger delta = logDifference.multiplyInteger(blockDifficulty).toBigInteger().divide(stakes);
    long offset = max(delta.longValueExact(), 1);
    if (timeStamp != (parentTimeStamp + offset)) {
        BlockHeaderValidatorUtil.addError(formatError(timeStamp, parentTimeStamp, offset), this.getClass(), errors);
        return false;
    }
    return true;
}

Example 2 with FixedPoint

use of org.aion.util.math.FixedPoint in project aion by aionnetwork.

the class StakingDeltaCalculator method calculateDelta.

// returns how long a block producer would have to wait, which is
// (difficulty * log(2^256 / hash(seed))) / stake
public static long calculateDelta(byte[] seed, BigInteger difficulty, BigInteger stake) {
    BigInteger dividend = new BigInteger(1, HashUtil.h256(seed));
    FixedPoint logDifference = logBoundary.subtract(LogApproximator.log(dividend));
    BigInteger delta = logDifference.multiplyInteger(difficulty).toBigInteger().divide(stake);
    return max(delta.longValueExact(), 1);
}