Examples with NakadiCursor org.zalando.nakadi.domain.NakadiCursor used on opensource projects

Example 26 with NakadiCursor

use of org.zalando.nakadi.domain.NakadiCursor in project nakadi by zalando.

the class CursorOperationsController method getDistance.

@RequestMapping(path = "/event-types/{eventTypeName}/cursor-distances", method = RequestMethod.POST)
public ResponseEntity<?> getDistance(@PathVariable("eventTypeName") final String eventTypeName, @Valid @RequestBody final ValidListWrapper<CursorDistance> queries) throws InternalNakadiException, NoSuchEventTypeException {
    final EventType eventType = eventTypeRepository.findByName(eventTypeName);
    authorizationValidator.authorizeStreamRead(eventType);
    queries.getList().forEach(query -> {
        try {
            final NakadiCursor initialCursor = cursorConverter.convert(eventTypeName, query.getInitialCursor());
            final NakadiCursor finalCursor = cursorConverter.convert(eventTypeName, query.getFinalCursor());
            final Long distance = cursorOperationsService.calculateDistance(initialCursor, finalCursor);
            query.setDistance(distance);
        } catch (InternalNakadiException | ServiceUnavailableException e) {
            throw new MyNakadiRuntimeException1("problem calculating cursors distance", e);
        } catch (final NoSuchEventTypeException e) {
            throw new NotFoundException("event type not found", e);
        } catch (final InvalidCursorException e) {
            throw new CursorConversionException("problem converting cursors", e);
        }
    });
    return status(OK).body(queries.getList());
}

Example 27 with NakadiCursor

use of org.zalando.nakadi.domain.NakadiCursor in project nakadi by zalando.

the class CursorOperationsController method moveCursors.

@RequestMapping(path = "/event-types/{eventTypeName}/shifted-cursors", method = RequestMethod.POST)
public ResponseEntity<?> moveCursors(@PathVariable("eventTypeName") final String eventTypeName, @Valid @RequestBody final ValidListWrapper<ShiftedCursor> cursors) throws InternalNakadiException, NoSuchEventTypeException {
    final EventType eventType = eventTypeRepository.findByName(eventTypeName);
    authorizationValidator.authorizeStreamRead(eventType);
    final List<ShiftedNakadiCursor> domainCursor = cursors.getList().stream().map(this.toShiftedNakadiCursor(eventTypeName)).collect(Collectors.toList());
    final List<NakadiCursor> domainResultCursors = cursorOperationsService.unshiftCursors(domainCursor);
    final List<Cursor> viewResult = domainResultCursors.stream().map(cursorConverter::convert).collect(Collectors.toList());
    return status(OK).body(viewResult);
}

Example 28 with NakadiCursor

use of org.zalando.nakadi.domain.NakadiCursor in project nakadi by zalando.

the class CursorOperationsController method cursorsLag.

@RequestMapping(path = "/event-types/{eventTypeName}/cursors-lag", method = RequestMethod.POST)
public List<CursorLag> cursorsLag(@PathVariable("eventTypeName") final String eventTypeName, @Valid @RequestBody final ValidListWrapper<Cursor> cursors) throws InternalNakadiException, NoSuchEventTypeException {
    final EventType eventType = eventTypeRepository.findByName(eventTypeName);
    authorizationValidator.authorizeStreamRead(eventType);
    final List<NakadiCursor> domainCursor = cursors.getList().stream().map(toNakadiCursor(eventTypeName)).collect(Collectors.toList());
    final List<NakadiCursorLag> lagResult = cursorOperationsService.cursorsLag(eventTypeName, domainCursor);
    return lagResult.stream().map(this::toCursorLag).collect(Collectors.toList());
}

Example 29 with NakadiCursor

use of org.zalando.nakadi.domain.NakadiCursor in project nakadi by zalando.

the class EventStreamController method streamEvents.

@RequestMapping(value = "/event-types/{name}/events", method = RequestMethod.GET)
public StreamingResponseBody streamEvents(@PathVariable("name") final String eventTypeName, @Nullable @RequestParam(value = "batch_limit", required = false) final Integer batchLimit, @Nullable @RequestParam(value = "stream_limit", required = false) final Integer streamLimit, @Nullable @RequestParam(value = "batch_flush_timeout", required = false) final Integer batchTimeout, @Nullable @RequestParam(value = "stream_timeout", required = false) final Integer streamTimeout, @Nullable @RequestParam(value = "stream_keep_alive_limit", required = false) final Integer streamKeepAliveLimit, @Nullable @RequestHeader(name = "X-nakadi-cursors", required = false) final String cursorsStr, final HttpServletRequest request, final HttpServletResponse response, final Client client) {
    final String flowId = FlowIdUtils.peek();
    return outputStream -> {
        FlowIdUtils.push(flowId);
        if (blacklistService.isConsumptionBlocked(eventTypeName, client.getClientId())) {
            writeProblemResponse(response, outputStream, Problem.valueOf(Response.Status.FORBIDDEN, "Application or event type is blocked"));
            return;
        }
        final AtomicBoolean connectionReady = closedConnectionsCrutch.listenForConnectionClose(request);
        Counter consumerCounter = null;
        EventStream eventStream = null;
        List<ConnectionSlot> connectionSlots = ImmutableList.of();
        final AtomicBoolean needCheckAuthorization = new AtomicBoolean(false);
        LOG.info("[X-NAKADI-CURSORS] \"{}\" {}", eventTypeName, Optional.ofNullable(cursorsStr).orElse("-"));
        try (Closeable ignore = eventTypeChangeListener.registerListener(et -> needCheckAuthorization.set(true), Collections.singletonList(eventTypeName))) {
            final EventType eventType = eventTypeRepository.findByName(eventTypeName);
            authorizeStreamRead(eventTypeName);
            // validate parameters
            final EventStreamConfig streamConfig = EventStreamConfig.builder().withBatchLimit(batchLimit).withStreamLimit(streamLimit).withBatchTimeout(batchTimeout).withStreamTimeout(streamTimeout).withStreamKeepAliveLimit(streamKeepAliveLimit).withEtName(eventTypeName).withConsumingClient(client).withCursors(getStreamingStart(eventType, cursorsStr)).withMaxMemoryUsageBytes(maxMemoryUsageBytes).build();
            // acquire connection slots to limit the number of simultaneous connections from one client
            if (featureToggleService.isFeatureEnabled(LIMIT_CONSUMERS_NUMBER)) {
                final List<String> partitions = streamConfig.getCursors().stream().map(NakadiCursor::getPartition).collect(Collectors.toList());
                connectionSlots = consumerLimitingService.acquireConnectionSlots(client.getClientId(), eventTypeName, partitions);
            }
            consumerCounter = metricRegistry.counter(metricNameFor(eventTypeName, CONSUMERS_COUNT_METRIC_NAME));
            consumerCounter.inc();
            final String kafkaQuotaClientId = getKafkaQuotaClientId(eventTypeName, client);
            response.setStatus(HttpStatus.OK.value());
            response.setHeader("Warning", "299 - nakadi - the Low-level API is deprecated and will " + "be removed from a future release. Please consider migrating to the Subscriptions API.");
            response.setContentType("application/x-json-stream");
            final EventConsumer eventConsumer = timelineService.createEventConsumer(kafkaQuotaClientId, streamConfig.getCursors());
            final String bytesFlushedMetricName = MetricUtils.metricNameForLoLAStream(client.getClientId(), eventTypeName);
            final Meter bytesFlushedMeter = this.streamMetrics.meter(bytesFlushedMetricName);
            eventStream = eventStreamFactory.createEventStream(outputStream, eventConsumer, streamConfig, bytesFlushedMeter);
            // Flush status code to client
            outputStream.flush();
            eventStream.streamEvents(connectionReady, () -> {
                if (needCheckAuthorization.getAndSet(false)) {
                    authorizeStreamRead(eventTypeName);
                }
            });
        } catch (final UnparseableCursorException e) {
            LOG.debug("Incorrect syntax of X-nakadi-cursors header: {}. Respond with BAD_REQUEST.", e.getCursors(), e);
            writeProblemResponse(response, outputStream, BAD_REQUEST, e.getMessage());
        } catch (final NoSuchEventTypeException e) {
            writeProblemResponse(response, outputStream, NOT_FOUND, "topic not found");
        } catch (final NoConnectionSlotsException e) {
            LOG.debug("Connection creation failed due to exceeding max connection count");
            writeProblemResponse(response, outputStream, e.asProblem());
        } catch (final NakadiException e) {
            LOG.error("Error while trying to stream events.", e);
            writeProblemResponse(response, outputStream, e.asProblem());
        } catch (final InvalidCursorException e) {
            writeProblemResponse(response, outputStream, PRECONDITION_FAILED, e.getMessage());
        } catch (final AccessDeniedException e) {
            writeProblemResponse(response, outputStream, FORBIDDEN, e.explain());
        } catch (final Exception e) {
            LOG.error("Error while trying to stream events. Respond with INTERNAL_SERVER_ERROR.", e);
            writeProblemResponse(response, outputStream, INTERNAL_SERVER_ERROR, e.getMessage());
        } finally {
            connectionReady.set(false);
            consumerLimitingService.releaseConnectionSlots(connectionSlots);
            if (consumerCounter != null) {
                consumerCounter.dec();
            }
            if (eventStream != null) {
                eventStream.close();
            }
            try {
                outputStream.flush();
            } finally {
                outputStream.close();
            }
        }
    };
}

Example 30 with NakadiCursor

use of org.zalando.nakadi.domain.NakadiCursor in project nakadi by zalando.

the class EventStreamController method getStreamingStart.

@VisibleForTesting
List<NakadiCursor> getStreamingStart(final EventType eventType, final String cursorsStr) throws UnparseableCursorException, ServiceUnavailableException, InvalidCursorException, InternalNakadiException, NoSuchEventTypeException {
    List<Cursor> cursors = null;
    if (cursorsStr != null) {
        try {
            cursors = jsonMapper.readValue(cursorsStr, new TypeReference<ArrayList<Cursor>>() {
            });
        } catch (final IOException ex) {
            throw new UnparseableCursorException("incorrect syntax of X-nakadi-cursors header", ex, cursorsStr);
        }
        // Unfortunately, In order to have consistent exception checking, one can not just call validator
        for (final Cursor cursor : cursors) {
            if (null == cursor.getPartition()) {
                throw new InvalidCursorException(CursorError.NULL_PARTITION, cursor);
            } else if (null == cursor.getOffset()) {
                throw new InvalidCursorException(CursorError.NULL_OFFSET, cursor);
            }
        }
    }
    final Timeline latestTimeline = timelineService.getActiveTimeline(eventType);
    if (null != cursors) {
        if (cursors.isEmpty()) {
            throw new InvalidCursorException(CursorError.INVALID_FORMAT);
        }
        final List<NakadiCursor> result = new ArrayList<>();
        for (final Cursor c : cursors) {
            result.add(cursorConverter.convert(eventType.getName(), c));
        }
        for (final NakadiCursor c : result) {
            if (c.getTimeline().isDeleted()) {
                throw new InvalidCursorException(CursorError.UNAVAILABLE, c);
            }
        }
        final Map<Storage, List<NakadiCursor>> groupedCursors = result.stream().collect(Collectors.groupingBy(c -> c.getTimeline().getStorage()));
        for (final Map.Entry<Storage, List<NakadiCursor>> entry : groupedCursors.entrySet()) {
            timelineService.getTopicRepository(entry.getKey()).validateReadCursors(entry.getValue());
        }
        return result;
    } else {
        final TopicRepository latestTopicRepository = timelineService.getTopicRepository(latestTimeline);
        // if no cursors provided - read from the newest available events
        return latestTopicRepository.loadTopicStatistics(Collections.singletonList(latestTimeline)).stream().map(PartitionStatistics::getLast).collect(Collectors.toList());
    }
}