Examples with IonValue com.amazon.ion.IonValue used on opensource projects

Example 1 with IonValue

use of com.amazon.ion.IonValue in project amazon-qldb-dmv-sample-java by aws-samples.

the class GetRevision method queryRegistrationsByVin.

/**
 * Query the registration history for the given VIN.
 *
 * @param txn
 *              The {@link TransactionExecutor} for lambda execute.
 * @param vin
 *              The unique VIN to query.
 * @return a list of {@link IonStruct} representing the registration history.
 * @throws IllegalStateException if failed to convert parameters into {@link IonValue}
 */
public static List<IonStruct> queryRegistrationsByVin(final TransactionExecutor txn, final String vin) {
    log.info(String.format("Let's query the 'VehicleRegistration' table for VIN: %s...", vin));
    log.info("Let's query the 'VehicleRegistration' table for VIN: {}...", vin);
    final String query = String.format("SELECT * FROM _ql_committed_%s WHERE data.VIN = ?", Constants.VEHICLE_REGISTRATION_TABLE_NAME);
    try {
        final List<IonValue> parameters = Collections.singletonList(Constants.MAPPER.writeValueAsIonValue(vin));
        final Result result = txn.execute(query, parameters);
        List<IonStruct> list = ScanTable.toIonStructs(result);
        log.info(String.format("Found %d document(s)!", list.size()));
        return list;
    } catch (IOException ioe) {
        throw new IllegalStateException(ioe);
    }
}

Example 2 with IonValue

use of com.amazon.ion.IonValue in project amazon-qldb-dmv-sample-java by aws-samples.

the class GetRevision method verifyRegistration.

/**
 * Verify each version of the registration for the given VIN.
 *
 * @param driver
 *              A QLDB driver.
 * @param ledgerName
 *              The ledger to get digest from.
 * @param vin
 *              VIN to query the revision history of a specific registration with.
 * @throws Exception if failed to verify digests.
 * @throws AssertionError if document revision verification failed.
 */
public static void verifyRegistration(final QldbDriver driver, final String ledgerName, final String vin) throws Exception {
    log.info(String.format("Let's verify the registration with VIN=%s, in ledger=%s.", vin, ledgerName));
    try {
        log.info("First, let's get a digest.");
        GetDigestResult digestResult = GetDigest.getDigest(ledgerName);
        ValueHolder digestTipAddress = digestResult.getDigestTipAddress();
        byte[] digestBytes = Verifier.convertByteBufferToByteArray(digestResult.getDigest());
        log.info("Got a ledger digest. Digest end address={}, digest={}.", QldbStringUtils.toUnredactedString(digestTipAddress), Verifier.toBase64(digestBytes));
        log.info(String.format("Next, let's query the registration with VIN=%s. " + "Then we can verify each version of the registration.", vin));
        List<IonStruct> documentsWithMetadataList = new ArrayList<>();
        driver.execute(txn -> {
            documentsWithMetadataList.addAll(queryRegistrationsByVin(txn, vin));
        });
        log.info("Registrations queried successfully!");
        log.info(String.format("Found %s revisions of the registration with VIN=%s.", documentsWithMetadataList.size(), vin));
        for (IonStruct ionStruct : documentsWithMetadataList) {
            QldbRevision document = QldbRevision.fromIon(ionStruct);
            log.info(String.format("Let's verify the document: %s", document));
            log.info("Let's get a proof for the document.");
            GetRevisionResult proofResult = getRevision(ledgerName, document.getMetadata().getId(), digestTipAddress, document.getBlockAddress());
            final IonValue proof = Constants.MAPPER.writeValueAsIonValue(proofResult.getProof());
            final IonReader reader = IonReaderBuilder.standard().build(proof);
            reader.next();
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            IonWriter writer = SYSTEM.newBinaryWriter(baos);
            writer.writeValue(reader);
            writer.close();
            baos.flush();
            baos.close();
            byte[] byteProof = baos.toByteArray();
            log.info(String.format("Got back a proof: %s", Verifier.toBase64(byteProof)));
            boolean verified = Verifier.verify(document.getHash(), digestBytes, proofResult.getProof().getIonText());
            if (!verified) {
                throw new AssertionError("Document revision is not verified!");
            } else {
                log.info("Success! The document is verified");
            }
            byte[] alteredDigest = Verifier.flipRandomBit(digestBytes);
            log.info(String.format("Flipping one bit in the digest and assert that the document is NOT verified. " + "The altered digest is: %s", Verifier.toBase64(alteredDigest)));
            verified = Verifier.verify(document.getHash(), alteredDigest, proofResult.getProof().getIonText());
            if (verified) {
                throw new AssertionError("Expected document to not be verified against altered digest.");
            } else {
                log.info("Success! As expected flipping a bit in the digest causes verification to fail.");
            }
            byte[] alteredDocumentHash = Verifier.flipRandomBit(document.getHash());
            log.info(String.format("Flipping one bit in the document's hash and assert that it is NOT verified. " + "The altered document hash is: %s.", Verifier.toBase64(alteredDocumentHash)));
            verified = Verifier.verify(alteredDocumentHash, digestBytes, proofResult.getProof().getIonText());
            if (verified) {
                throw new AssertionError("Expected altered document hash to not be verified against digest.");
            } else {
                log.info("Success! As expected flipping a bit in the document hash causes verification to fail.");
            }
        }
    } catch (Exception e) {
        log.error("Failed to verify digests.", e);
        throw e;
    }
    log.info(String.format("Finished verifying the registration with VIN=%s in ledger=%s.", vin, ledgerName));
}

Example 3 with IonValue

use of com.amazon.ion.IonValue in project amazon-qldb-dmv-sample-java by aws-samples.

the class InsertIonTypes method updateRecordAndVerifyType.

/**
 * Update a document's Name value in the database. Then, query the value of the Name key and verify the expected Ion type was
 * saved.
 *
 * @param txn
 *              The {@link TransactionExecutor} for statement execution.
 * @param ionValue
 *              The {@link IonValue} to set the document's Name value to.
 *
 * @throws AssertionError when no value is returned for the Name key or if the value does not match the expected type.
 */
public static void updateRecordAndVerifyType(final TransactionExecutor txn, final IonValue ionValue) {
    final String updateStatement = String.format("UPDATE %s SET Name = ?", TABLE_NAME);
    final List<IonValue> parameters = Collections.singletonList(ionValue);
    txn.execute(updateStatement, parameters);
    log.info("Updated document.");
    final String searchQuery = String.format("SELECT VALUE Name FROM %s", TABLE_NAME);
    final Result result = txn.execute(searchQuery);
    if (result.isEmpty()) {
        throw new AssertionError("Did not find any values for the Name key.");
    }
    for (IonValue value : result) {
        if (!ionValue.getClass().isInstance(value)) {
            throw new AssertionError(String.format("The queried value, %s, is not an instance of %s.", value.getClass().toString(), ionValue.getClass().toString()));
        }
        if (!value.getType().equals(ionValue.getType())) {
            throw new AssertionError(String.format("The queried value type, %s, does not match %s.", value.getType().toString(), ionValue.getType().toString()));
        }
    }
    log.info("Successfully verified value is instance of {} with type {}.", ionValue.getClass().toString(), ionValue.getType().toString());
}

Example 4 with IonValue

use of com.amazon.ion.IonValue in project amazon-qldb-dmv-sample-java by aws-samples.

the class RegisterDriversLicense method registerNewDriversLicense.

/**
 * Register a new driver's license.
 *
 * @param txn
 *              The {@link TransactionExecutor} for lambda execute.
 * @param govId
 *              The government ID of the new owner.
 * @param license
 *              The new license to register.
 * @param personId
 *              The unique personId of the new owner.
 * @throws IllegalStateException if failed to convert document ID to an IonValue.
 */
public static void registerNewDriversLicense(final TransactionExecutor txn, final String govId, final DriversLicense license, final String personId) {
    try {
        if (personHadDriversLicense(txn, personId)) {
            log.info("Person with government ID '{}' already has a license! No new license added.", govId);
            return;
        }
        final String query = "INSERT INTO DriversLicense ?";
        log.info(new IonObjectMapper().writeValueAsIonValue(license).toPrettyString());
        final List<IonValue> parameters = Collections.singletonList(Constants.MAPPER.writeValueAsIonValue(license));
        txn.execute(query, parameters);
        Result result = queryDriversLicenseByPersonId(txn, govId);
        if (ScanTable.toIonStructs(result).size() > 0) {
            log.info("Problem occurred while inserting new license, please review the results.");
        } else {
            log.info("Successfully registered new driver.");
        }
    } catch (IOException ioe) {
        throw new IllegalStateException(ioe);
    }
}

Example 5 with IonValue

use of com.amazon.ion.IonValue in project amazon-qldb-dmv-sample-java by aws-samples.

the class TransferVehicleOwnership method findPrimaryOwnerForVehicle.

/**
 * Find the primary owner for the given VIN.
 *
 * @param txn
 *              The {@link TransactionExecutor} for lambda execute.
 * @param vin
 *              Unique VIN for a vehicle.
 * @return a {@link Person} object.
 * @throws IllegalStateException if failed to convert parameter into {@link IonValue}.
 */
public static Person findPrimaryOwnerForVehicle(final TransactionExecutor txn, final String vin) {
    try {
        log.info("Finding primary owner for vehicle with Vin: {}...", vin);
        final String query = "SELECT Owners.PrimaryOwner.PersonId FROM VehicleRegistration AS v WHERE v.VIN = ?";
        final List<IonValue> parameters = Collections.singletonList(Constants.MAPPER.writeValueAsIonValue(vin));
        Result result = txn.execute(query, parameters);
        final List<IonStruct> documents = ScanTable.toIonStructs(result);
        ScanTable.printDocuments(documents);
        if (documents.isEmpty()) {
            throw new IllegalStateException("Unable to find registrations with VIN: " + vin);
        }
        final IonReader reader = IonReaderBuilder.standard().build(documents.get(0));
        final String personId = Constants.MAPPER.readValue(reader, LinkedHashMap.class).get("PersonId").toString();
        return findPersonFromDocumentId(txn, personId);
    } catch (IOException ioe) {
        throw new IllegalStateException(ioe);
    }
}