Examples with DeserializerProcessor com.nextdoor.bender.deserializer.DeserializerProcessor used on opensource projects

Example 1 with DeserializerProcessor

use of com.nextdoor.bender.deserializer.DeserializerProcessor in project bender by Nextdoor.

the class BaseHandler method processInternal.

/**
 * Method called by Handler implementations to process records.
 *
 * @param context Lambda invocation context.
 * @throws HandlerException
 */
private void processInternal(Context context) throws HandlerException {
    Stat runtime = new Stat("runtime.ns");
    runtime.start();
    Source source = this.getSource();
    DeserializerProcessor deser = source.getDeserProcessor();
    List<OperationProcessor> operations = source.getOperationProcessors();
    List<String> containsStrings = source.getContainsStrings();
    List<Pattern> regexPatterns = source.getRegexPatterns();
    this.getIpcService().setContext(context);
    Iterator<InternalEvent> events = this.getInternalEventIterator();
    /*
     * For logging purposes log when the function started running
     */
    this.monitor.invokeTimeNow();
    AtomicLong eventCount = new AtomicLong(0);
    AtomicLong oldestArrivalTime = new AtomicLong(System.currentTimeMillis());
    AtomicLong oldestOccurrenceTime = new AtomicLong(System.currentTimeMillis());
    /*
     * Process each record
     */
    int characteristics = Spliterator.IMMUTABLE;
    Spliterator<InternalEvent> spliterator = Spliterators.spliteratorUnknownSize(events, characteristics);
    Stream<InternalEvent> input = StreamSupport.stream(spliterator, false);
    /*
     * Filter out raw events
     */
    Stream<InternalEvent> filtered = input.filter(/*
         * Perform regex filter
         */
    ievent -> {
        eventCount.incrementAndGet();
        String eventStr = ievent.getEventString();
        /*
           * Apply String contains filters before deserialization
           */
        for (String containsString : containsStrings) {
            if (eventStr.contains(containsString)) {
                return false;
            }
        }
        /*
           * Apply regex patterns before deserialization
           */
        for (Pattern regexPattern : regexPatterns) {
            Matcher m = regexPattern.matcher(eventStr);
            if (m.find()) {
                return false;
            }
        }
        return true;
    });
    /*
     * Deserialize
     */
    Stream<InternalEvent> deserialized = filtered.map(ievent -> {
        DeserializedEvent data = deser.deserialize(ievent.getEventString());
        if (data == null || data.getPayload() == null) {
            logger.warn("Failed to deserialize: " + ievent.getEventString());
            return null;
        }
        ievent.setEventObj(data);
        return ievent;
    }).filter(Objects::nonNull);
    /*
     * Perform Operations
     */
    Stream<InternalEvent> operated = deserialized;
    for (OperationProcessor operation : operations) {
        operated = operation.perform(operated);
    }
    /*
     * Serialize
     */
    Stream<InternalEvent> serialized = operated.map(ievent -> {
        try {
            String raw = null;
            raw = this.ser.serialize(this.wrapper.getWrapped(ievent));
            ievent.setSerialized(raw);
            return ievent;
        } catch (SerializationException e) {
            return null;
        }
    }).filter(Objects::nonNull);
    /*
     * Transport
     */
    serialized.forEach(ievent -> {
        /*
       * Update times
       */
        updateOldest(oldestArrivalTime, ievent.getArrivalTime());
        updateOldest(oldestOccurrenceTime, ievent.getEventTime());
        try {
            this.getIpcService().add(ievent);
        } catch (TransportException e) {
            logger.warn("error adding event", e);
        }
    });
    /*
     * Wait for transporters to finish
     */
    try {
        this.getIpcService().shutdown();
    } catch (TransportException e) {
        throw new HandlerException("encounted TransportException while shutting down ipcService", e);
    } catch (InterruptedException e) {
        throw new HandlerException("thread was interruptedwhile shutting down ipcService", e);
    } finally {
        String evtSource = this.getSourceName();
        runtime.stop();
        if (!this.skipWriteStats) {
            writeStats(eventCount.get(), oldestArrivalTime.get(), oldestOccurrenceTime.get(), evtSource, runtime);
        }
        if (logger.isTraceEnabled()) {
            getGCStats();
        }
    }
}

Example 2 with DeserializerProcessor

use of com.nextdoor.bender.deserializer.DeserializerProcessor in project bender by Nextdoor.

the class BaseHandlerTest method testFilterNullDeserialization.

@Test
public void testFilterNullDeserialization() throws HandlerException {
    BaseHandler.CONFIG_FILE = "/config/handler_config.json";
    handler.skipWriteStats = true;
    List<DummyEvent> events = new ArrayList<DummyEvent>(1);
    events.add(new DummyEvent("foo", 0));
    TestContext context = new TestContext();
    context.setInvokedFunctionArn("arn:aws:lambda:us-east-1:123:function:test:tag");
    handler.init(context);
    DeserializerProcessor proc = handler.sources.get(0).getDeserProcessor();
    Deserializer deserSpy = spy(proc.getDeserializer());
    when(deserSpy.deserialize(anyString())).thenReturn(null);
    proc.setDeserializer(deserSpy);
    handler.handler(events, context);
    assertEquals(0, BufferedTransporter.output.size());
}

Example 3 with DeserializerProcessor

use of com.nextdoor.bender.deserializer.DeserializerProcessor in project bender by Nextdoor.

the class BaseHandlerTest method testFilterFailedDeserialization.

@Test
public void testFilterFailedDeserialization() throws HandlerException {
    BaseHandler.CONFIG_FILE = "/config/handler_config.json";
    handler.skipWriteStats = true;
    List<DummyEvent> events = new ArrayList<DummyEvent>(1);
    events.add(new DummyEvent("foo", 0));
    TestContext context = new TestContext();
    context.setInvokedFunctionArn("arn:aws:lambda:us-east-1:123:function:test:tag");
    handler.init(context);
    DeserializerProcessor proc = handler.sources.get(0).getDeserProcessor();
    Deserializer deserSpy = spy(proc.getDeserializer());
    doThrow(new DeserializationException("expected")).when(deserSpy).deserialize(anyString());
    proc.setDeserializer(deserSpy);
    handler.handler(events, context);
    assertEquals(0, BufferedTransporter.output.size());
}

Example 4 with DeserializerProcessor

use of com.nextdoor.bender.deserializer.DeserializerProcessor in project bender by Nextdoor.

the class BaseHandlerTest method testDeserializationException.

@Test
public void testDeserializationException() throws HandlerException {
    BaseHandler.CONFIG_FILE = "/config/handler_config.json";
    handler.skipWriteStats = true;
    List<DummyEvent> events = new ArrayList<DummyEvent>(1);
    events.add(new DummyEvent("foo", 0));
    TestContext context = new TestContext();
    context.setInvokedFunctionArn("arn:aws:lambda:us-east-1:123:function:test:tag");
    handler.init(context);
    DeserializerProcessor proc = handler.sources.get(0).getDeserProcessor();
    Deserializer deserSpy = spy(proc.getDeserializer());
    doThrow(new DeserializationException("expected")).when(deserSpy).deserialize(anyString());
    proc.setDeserializer(deserSpy);
    handler.handler(events, context);
    assertEquals(1, proc.getErrorCountStat().getValue());
}