Examples with PublisherInterface com.google.cloud.pubsub.v1.PublisherInterface used on opensource projects

Example 1 with PublisherInterface

use of com.google.cloud.pubsub.v1.PublisherInterface in project micronaut-gcp by micronaut-projects.

the class PubSubClientIntroductionAdvice method intercept.

@Override
public Object intercept(MethodInvocationContext<Object, Object> context) {
    if (context.hasAnnotation(Topic.class)) {
        PubSubPublisherState publisherState = publisherStateCache.computeIfAbsent(context.getExecutableMethod(), method -> {
            String projectId = method.stringValue(PubSubClient.class).orElse(googleCloudConfiguration.getProjectId());
            Optional<Argument> orderingArgument = Arrays.stream(method.getArguments()).filter(argument -> argument.getAnnotationMetadata().hasAnnotation(OrderingKey.class)).findFirst();
            String topic = method.stringValue(Topic.class).orElse(context.getName());
            String endpoint = method.stringValue(Topic.class, "endpoint").orElse("");
            String configurationName = method.stringValue(Topic.class, "configuration").orElse("");
            String contentType = method.stringValue(Topic.class, "contentType").orElse(MediaType.APPLICATION_JSON);
            ProjectTopicName projectTopicName = PubSubTopicUtils.toProjectTopicName(topic, projectId);
            Map<String, String> staticMessageAttributes = new HashMap<>();
            List<AnnotationValue<MessageHeader>> headerAnnotations = context.getAnnotationValuesByType(MessageHeader.class);
            headerAnnotations.forEach((header) -> {
                String name = header.stringValue("name").orElse(null);
                String value = header.stringValue().orElse(null);
                if (StringUtils.isNotEmpty(name) && StringUtils.isNotEmpty(value)) {
                    staticMessageAttributes.put(name, value);
                }
            });
            Argument<?> bodyArgument = findBodyArgument(method).orElseThrow(() -> new PubSubClientException("No valid message body argument found for method: " + context.getExecutableMethod()));
            PubSubPublisherState.TopicState topicState = new PubSubPublisherState.TopicState(contentType, projectTopicName, configurationName, endpoint, orderingArgument.isPresent());
            logger.debug("Created a new publisher[{}] for topic: {}", context.getExecutableMethod().getName(), topic);
            PublisherInterface publisher = publisherFactory.createPublisher(new PublisherFactoryConfig(topicState, pubSubConfigurationProperties.getPublishingExecutor()));
            return new PubSubPublisherState(topicState, staticMessageAttributes, bodyArgument, publisher, orderingArgument);
        });
        Map<String, String> messageAttributes = new HashMap<>(publisherState.getStaticMessageAttributes());
        String contentType = publisherState.getTopicState().getContentType();
        Argument<?> bodyArgument = publisherState.getBodyArgument();
        Map<String, Object> parameterValues = context.getParameterValueMap();
        final ReturnType<Object> returnTypeInfo = context.getReturnType();
        ReturnType<Object> returnType = returnTypeInfo;
        Class<?> javaReturnType = returnType.getType();
        Argument[] arguments = context.getArguments();
        for (Argument arg : arguments) {
            AnnotationValue<MessageHeader> headerAnn = arg.getAnnotation(MessageHeader.class);
            if (headerAnn != null) {
                Map.Entry<String, String> entry = getNameAndValue(arg, headerAnn, parameterValues);
                messageAttributes.put(entry.getKey(), entry.getValue());
            }
        }
        PublisherInterface publisher = publisherState.getPublisher();
        Object body = parameterValues.get(bodyArgument.getName());
        PubsubMessage pubsubMessage = null;
        if (body.getClass() == PubsubMessage.class) {
            pubsubMessage = (PubsubMessage) body;
        } else {
            // if target type is byte[] we bypass serdes completely
            byte[] serialized = null;
            if (body.getClass() == byte[].class) {
                serialized = (byte[]) body;
            } else {
                PubSubMessageSerDes serDes = serDesRegistry.find(contentType).orElseThrow(() -> new PubSubClientException("Could not locate a valid SerDes implementation for type: " + contentType));
                serialized = serDes.serialize(body);
            }
            messageAttributes.put("Content-Type", contentType);
            PubsubMessage.Builder messageBuilder = PubsubMessage.newBuilder();
            messageBuilder.setData(ByteString.copyFrom(serialized)).putAllAttributes(messageAttributes);
            if (publisherState.getOrderingArgument().isPresent()) {
                String orderingKey = conversionService.convert(parameterValues.get(publisherState.getOrderingArgument().get().getName()), String.class).orElseThrow(() -> new PubSubClientException("Could not convert argument annotated with @OrderingKey to String type"));
                messageBuilder.setOrderingKey(orderingKey);
            }
            pubsubMessage = messageBuilder.build();
        }
        PubsubMessage finalPubsubMessage = pubsubMessage;
        Mono<String> reactiveResult = Mono.create(sink -> {
            ApiFuture<String> future = publisher.publish(finalPubsubMessage);
            future.addListener(() -> {
                try {
                    final String result = future.get();
                    sink.success(result);
                } catch (Throwable e) {
                    sink.error(e);
                }
            }, executorService);
        });
        if (javaReturnType == void.class || javaReturnType == Void.class) {
            String result = reactiveResult.block();
            return null;
        } else {
            if (returnTypeInfo.isReactive()) {
                return Publishers.convertPublisher(reactiveResult, javaReturnType);
            } else if (returnTypeInfo.isAsync()) {
                return reactiveResult.toFuture();
            } else {
                String result = reactiveResult.block();
                return conversionService.convert(result, javaReturnType).orElseThrow(() -> new PubSubClientException("Could not convert publisher result to method return type: " + javaReturnType));
            }
        }
    } else {
        return context.proceed();
    }
}