private static Function<ClientResponse, Mono<ClientResponse>> convertClientResponse(Function<Flux<DataBuffer>, Flux<DataBuffer>> bodConverter, MediaType contentType) { return response -> { ClientResponse convertedResponse = ClientResponse.from(response).headers(headers -> { headers.replace(HttpHeaders.CONTENT_TYPE, singletonList(contentType.toString())); headers.remove(HttpHeaders.CONTENT_LENGTH); }).body(response.bodyToFlux(DataBuffer.class).transform(bodConverter)).build(); return Mono.just(convertedResponse); }; }
/** * Consume up to the specified number of bytes from the response body and * cancel if any more data arrives. * <p>Internally delegates to {@link DataBufferUtils#takeUntilByteCount}. * @param maxByteCount the limit as number of bytes * @return the filter to limit the response size with * @since 5.1 */ public static ExchangeFilterFunction limitResponseSize(long maxByteCount) { return (request, next) -> next.exchange(request).map(response -> { Flux<DataBuffer> body = response.body(BodyExtractors.toDataBuffers()); body = DataBufferUtils.takeUntilByteCount(body, maxByteCount); return ClientResponse.from(response).body(body).build(); }); }
@Test public void from() { Flux<DataBuffer> otherBody = Flux.just("foo", "bar") .map(s -> s.getBytes(StandardCharsets.UTF_8)) .map(dataBufferFactory::wrap); ClientResponse other = ClientResponse.create(HttpStatus.BAD_REQUEST, ExchangeStrategies.withDefaults()) .header("foo", "bar") .cookie("baz", "qux") .body(otherBody) .build(); Flux<DataBuffer> body = Flux.just("baz") .map(s -> s.getBytes(StandardCharsets.UTF_8)) .map(dataBufferFactory::wrap); ClientResponse result = ClientResponse.from(other) .headers(httpHeaders -> httpHeaders.set("foo", "baar")) .cookies(cookies -> cookies.set("baz", ResponseCookie.from("baz", "quux").build())) .body(body) .build(); assertEquals(HttpStatus.BAD_REQUEST, result.statusCode()); assertEquals(1, result.headers().asHttpHeaders().size()); assertEquals("baar", result.headers().asHttpHeaders().getFirst("foo")); assertEquals(1, result.cookies().size()); assertEquals("quux", result.cookies().getFirst("baz").getValue()); StepVerifier.create(result.bodyToFlux(String.class)) .expectNext("baz") .verifyComplete(); }
@Override public Mono<ClientResponse> filter(ClientRequest request, ExchangeFunction next) { URI originalUrl = request.url(); String serviceId = originalUrl.getHost(); if(serviceId == null) { String msg = String.format("Request URI does not contain a valid hostname: %s", originalUrl.toString()); logger.warn(msg); return Mono.just(ClientResponse.create(HttpStatus.BAD_REQUEST).body(msg).build()); } //TODO: reactive lb client ServiceInstance instance = this.loadBalancerClient.choose(serviceId); if(instance == null) { String msg = String.format("Load balancer does not contain an instance for the service %s", serviceId); logger.warn(msg); return Mono.just(ClientResponse.create(HttpStatus.SERVICE_UNAVAILABLE).body(msg).build()); } URI uri = this.loadBalancerClient.reconstructURI(instance, originalUrl); ClientRequest newRequest = ClientRequest.method(request.method(), uri) .headers(headers -> headers.addAll(request.headers())) .cookies(cookies -> cookies.addAll(request.cookies())) .attributes(attributes -> attributes.putAll(request.attributes())) .body(request.body()) .build(); return next.exchange(newRequest); }
@Override public void onNext(ClientResponse response) { this.done = true; try { // decorate response body this.actual .onNext(ClientResponse.from(response) .body(response.bodyToFlux(DataBuffer.class) .transform(this.scopePassingTransformer)) .build()); } finally { terminateSpan(response, null); } }
@Override public Mono<ClientResponse> filter(ClientRequest request, ExchangeFunction next) { URI originalUrl = request.url(); String serviceId = originalUrl.getHost(); if(serviceId == null) { String msg = String.format("Request URI does not contain a valid hostname: %s", originalUrl.toString()); logger.warn(msg); return Mono.just(ClientResponse.create(HttpStatus.BAD_REQUEST).body(msg).build()); } //TODO: reactive lb client ServiceInstance instance = this.loadBalancerClient.choose(serviceId); if(instance == null) { String msg = String.format("Load balancer does not contain an instance for the service %s", serviceId); logger.warn(msg); return Mono.just(ClientResponse.create(HttpStatus.SERVICE_UNAVAILABLE).body(msg).build()); } URI uri = this.loadBalancerClient.reconstructURI(instance, originalUrl); ClientRequest newRequest = ClientRequest.method(request.method(), uri) .headers(headers -> headers.addAll(request.headers())) .cookies(cookies -> cookies.addAll(request.cookies())) .attributes(attributes -> attributes.putAll(request.attributes())) .body(request.body()) .build(); return next.exchange(newRequest); }
@Override public void onNext(ClientResponse response) { this.done = true; try { // decorate response body this.actual .onNext(ClientResponse.from(response) .body(response.bodyToFlux(DataBuffer.class) .transform(this.scopePassingTransformer)) .build()); } finally { terminateSpan(response, null); } }
@Test public void normal() { Flux<DataBuffer> body = Flux.just("baz") .map(s -> s.getBytes(StandardCharsets.UTF_8)) .map(dataBufferFactory::wrap); ClientResponse response = ClientResponse.create(HttpStatus.BAD_GATEWAY, ExchangeStrategies.withDefaults()) .header("foo", "bar") .cookie("baz", "qux") .body(body) .build(); assertEquals(HttpStatus.BAD_GATEWAY, response.statusCode()); HttpHeaders responseHeaders = response.headers().asHttpHeaders(); assertEquals("bar", responseHeaders.getFirst("foo")); assertNotNull("qux", response.cookies().getFirst("baz")); assertEquals("qux", response.cookies().getFirst("baz").getValue()); StepVerifier.create(response.bodyToFlux(String.class)) .expectNext("baz") .verifyComplete(); }
@Test public void limitResponseSize() { DefaultDataBufferFactory bufferFactory = new DefaultDataBufferFactory(); DataBuffer b1 = dataBuffer("foo", bufferFactory); DataBuffer b2 = dataBuffer("bar", bufferFactory); DataBuffer b3 = dataBuffer("baz", bufferFactory); ClientRequest request = ClientRequest.create(HttpMethod.GET, DEFAULT_URL).build(); ClientResponse response = ClientResponse.create(HttpStatus.OK).body(Flux.just(b1, b2, b3)).build(); Mono<ClientResponse> result = ExchangeFilterFunctions.limitResponseSize(5) .filter(request, req -> Mono.just(response)); StepVerifier.create(result.flatMapMany(res -> res.body(BodyExtractors.toDataBuffers()))) .consumeNextWith(buffer -> assertEquals("foo", string(buffer))) .consumeNextWith(buffer -> assertEquals("ba", string(buffer))) .expectComplete() .verify(); }