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Implement support for NDJSON streaming in vertex-web
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90 changes: 90 additions & 0 deletions
90
...ions/vertx-web/runtime/src/main/java/io/quarkus/vertx/web/runtime/MultiNdjsonSupport.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| package io.quarkus.vertx.web.runtime; | ||
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| import org.reactivestreams.Subscriber; | ||
| import org.reactivestreams.Subscription; | ||
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| import io.smallrye.mutiny.Multi; | ||
| import io.vertx.core.AsyncResult; | ||
| import io.vertx.core.MultiMap; | ||
| import io.vertx.core.buffer.Buffer; | ||
| import io.vertx.core.http.HttpHeaders; | ||
| import io.vertx.core.http.HttpServerResponse; | ||
| import io.vertx.core.json.Json; | ||
| import io.vertx.ext.web.RoutingContext; | ||
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| @SuppressWarnings("ReactiveStreamsSubscriberImplementation") | ||
| public class MultiNdjsonSupport { | ||
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| private MultiNdjsonSupport() { | ||
| // Avoid direct instantiation. | ||
| } | ||
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| private static void initialize(HttpServerResponse response, RoutingContext rc) { | ||
| if (response.bytesWritten() == 0) { | ||
| MultiMap headers = response.headers(); | ||
| if (rc.getAcceptableContentType() == null) { | ||
| headers.set(HttpHeaders.CONTENT_TYPE, "application/x-ndjson"); | ||
| } | ||
| response.setChunked(true); | ||
| } | ||
| } | ||
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| public static void subscribeString(Multi<String> multi, RoutingContext rc) { | ||
| write(multi.map(s -> Buffer.buffer("\"" + s + "\"")), rc); | ||
| } | ||
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| public static void subscribeObject(Multi<Object> multi, RoutingContext rc) { | ||
| write(multi.map(o -> Buffer.buffer(Json.encode(o) + "\n")), rc); | ||
| } | ||
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| private static void onWriteDone(Subscription subscription, AsyncResult<Void> ar, RoutingContext rc) { | ||
| if (ar.failed()) { | ||
| rc.fail(ar.cause()); | ||
| } else { | ||
| subscription.request(1); | ||
| } | ||
| } | ||
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| public static void write(Multi<Buffer> multi, RoutingContext rc) { | ||
| HttpServerResponse response = rc.response(); | ||
| multi.subscribe().withSubscriber(new Subscriber<Buffer>() { | ||
| Subscription upstream; | ||
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| @Override | ||
| public void onSubscribe(Subscription subscription) { | ||
| this.upstream = subscription; | ||
| this.upstream.request(1); | ||
| } | ||
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| @Override | ||
| public void onNext(Buffer item) { | ||
| initialize(response, rc); | ||
| response.write(item, ar -> onWriteDone(upstream, ar, rc)); | ||
| } | ||
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| @Override | ||
| public void onError(Throwable throwable) { | ||
| rc.fail(throwable); | ||
| } | ||
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| @Override | ||
| public void onComplete() { | ||
| endOfStream(response, rc); | ||
| } | ||
| }); | ||
| } | ||
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| private static void endOfStream(HttpServerResponse response, RoutingContext rc) { | ||
| if (response.bytesWritten() == 0) { // No item | ||
| MultiMap headers = response.headers(); | ||
| if (rc.getAcceptableContentType() == null) { | ||
| headers.set(HttpHeaders.CONTENT_TYPE, "application/x-ndjson"); | ||
| } | ||
| } | ||
| response.end(); | ||
| } | ||
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| public static boolean isNdjson(Multi<?> multi) { | ||
| return multi instanceof NdjsonMulti; | ||
| } | ||
| } |
25 changes: 25 additions & 0 deletions
25
extensions/vertx-web/runtime/src/main/java/io/quarkus/vertx/web/runtime/NdjsonMulti.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| package io.quarkus.vertx.web.runtime; | ||
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| import io.smallrye.mutiny.Multi; | ||
| import io.smallrye.mutiny.infrastructure.Infrastructure; | ||
| import io.smallrye.mutiny.operators.AbstractMulti; | ||
| import io.smallrye.mutiny.subscription.MultiSubscriber; | ||
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| /** | ||
| * Just a wrapped to capture the fact that the items must be written as SSE. | ||
| * | ||
| * @param <T> the type of item. | ||
| */ | ||
| public class NdjsonMulti<T> extends AbstractMulti<T> { | ||
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| private final Multi<T> multi; | ||
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| public NdjsonMulti(Multi<T> multi) { | ||
| this.multi = multi; | ||
| } | ||
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| @Override | ||
| public void subscribe(MultiSubscriber<? super T> subscriber) { | ||
| multi.subscribe(Infrastructure.onMultiSubscription(multi, subscriber)); | ||
| } | ||
| } |