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NettyRoutingFilter.java
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NettyRoutingFilter.java
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/*
* Copyright 2013-2019 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cloud.gateway.filter;
import java.net.URI;
import java.time.Duration;
import java.util.List;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelOption;
import io.netty.handler.codec.http.DefaultHttpHeaders;
import io.netty.handler.codec.http.HttpMethod;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.netty.http.client.HttpClient;
import reactor.netty.http.client.HttpClientResponse;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.cloud.gateway.config.HttpClientProperties;
import org.springframework.cloud.gateway.filter.headers.HttpHeadersFilter;
import org.springframework.cloud.gateway.filter.headers.HttpHeadersFilter.Type;
import org.springframework.cloud.gateway.route.Route;
import org.springframework.cloud.gateway.support.TimeoutException;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DefaultDataBuffer;
import org.springframework.core.io.buffer.NettyDataBuffer;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.AbstractServerHttpResponse;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.http.server.reactive.ServerHttpResponseDecorator;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ResponseStatusException;
import org.springframework.web.server.ServerWebExchange;
import static org.springframework.cloud.gateway.filter.headers.HttpHeadersFilter.filterRequest;
import static org.springframework.cloud.gateway.support.RouteMetadataUtils.CONNECT_TIMEOUT_ATTR;
import static org.springframework.cloud.gateway.support.RouteMetadataUtils.RESPONSE_TIMEOUT_ATTR;
import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.CLIENT_RESPONSE_ATTR;
import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.CLIENT_RESPONSE_CONN_ATTR;
import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.CLIENT_RESPONSE_HEADER_NAMES;
import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR;
import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR;
import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.ORIGINAL_RESPONSE_CONTENT_TYPE_ATTR;
import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.PRESERVE_HOST_HEADER_ATTRIBUTE;
import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.isAlreadyRouted;
import static org.springframework.cloud.gateway.support.ServerWebExchangeUtils.setAlreadyRouted;
/**
* @author Spencer Gibb
* @author Biju Kunjummen
*/
public class NettyRoutingFilter implements GlobalFilter, Ordered {
private static final Log log = LogFactory.getLog(NettyRoutingFilter.class);
private final HttpClient httpClient;
private final ObjectProvider<List<HttpHeadersFilter>> headersFiltersProvider;
private final HttpClientProperties properties;
// do not use this headersFilters directly, use getHeadersFilters() instead.
private volatile List<HttpHeadersFilter> headersFilters;
public NettyRoutingFilter(HttpClient httpClient,
ObjectProvider<List<HttpHeadersFilter>> headersFiltersProvider,
HttpClientProperties properties) {
this.httpClient = httpClient;
this.headersFiltersProvider = headersFiltersProvider;
this.properties = properties;
}
public List<HttpHeadersFilter> getHeadersFilters() {
if (headersFilters == null) {
headersFilters = headersFiltersProvider.getIfAvailable();
}
return headersFilters;
}
@Override
public int getOrder() {
return Ordered.LOWEST_PRECEDENCE;
}
@Override
@SuppressWarnings("Duplicates")
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
URI requestUrl = exchange.getRequiredAttribute(GATEWAY_REQUEST_URL_ATTR);
String scheme = requestUrl.getScheme();
if (isAlreadyRouted(exchange)
|| (!"http".equals(scheme) && !"https".equals(scheme))) {
return chain.filter(exchange);
}
setAlreadyRouted(exchange);
ServerHttpRequest request = exchange.getRequest();
final HttpMethod method = HttpMethod.valueOf(request.getMethodValue());
final String url = requestUrl.toASCIIString();
HttpHeaders filtered = filterRequest(getHeadersFilters(), exchange);
final DefaultHttpHeaders httpHeaders = new DefaultHttpHeaders();
filtered.forEach(httpHeaders::set);
boolean preserveHost = exchange
.getAttributeOrDefault(PRESERVE_HOST_HEADER_ATTRIBUTE, false);
Route route = exchange.getAttribute(GATEWAY_ROUTE_ATTR);
Flux<HttpClientResponse> responseFlux = httpClientWithTimeoutFrom(route)
.headers(headers -> {
headers.add(httpHeaders);
// Will either be set below, or later by Netty
headers.remove(HttpHeaders.HOST);
if (preserveHost) {
String host = request.getHeaders().getFirst(HttpHeaders.HOST);
headers.add(HttpHeaders.HOST, host);
}
}).request(method).uri(url).send((req, nettyOutbound) -> {
if (log.isTraceEnabled()) {
nettyOutbound
.withConnection(connection -> log.trace("outbound route: "
+ connection.channel().id().asShortText()
+ ", inbound: " + exchange.getLogPrefix()));
}
return nettyOutbound.send(request.getBody().map(this::getByteBuf));
}).responseConnection((res, connection) -> {
// Defer committing the response until all route filters have run
// Put client response as ServerWebExchange attribute and write
// response later NettyWriteResponseFilter
exchange.getAttributes().put(CLIENT_RESPONSE_ATTR, res);
exchange.getAttributes().put(CLIENT_RESPONSE_CONN_ATTR, connection);
ServerHttpResponse response = exchange.getResponse();
// put headers and status so filters can modify the response
HttpHeaders headers = new HttpHeaders();
res.responseHeaders().forEach(
entry -> headers.add(entry.getKey(), entry.getValue()));
String contentTypeValue = headers.getFirst(HttpHeaders.CONTENT_TYPE);
if (StringUtils.hasLength(contentTypeValue)) {
exchange.getAttributes().put(ORIGINAL_RESPONSE_CONTENT_TYPE_ATTR,
contentTypeValue);
}
setResponseStatus(res, response);
// make sure headers filters run after setting status so it is
// available in response
HttpHeaders filteredResponseHeaders = HttpHeadersFilter.filter(
getHeadersFilters(), headers, exchange, Type.RESPONSE);
if (!filteredResponseHeaders
.containsKey(HttpHeaders.TRANSFER_ENCODING)
&& filteredResponseHeaders
.containsKey(HttpHeaders.CONTENT_LENGTH)) {
// It is not valid to have both the transfer-encoding header and
// the content-length header.
// Remove the transfer-encoding header in the response if the
// content-length header is present.
response.getHeaders().remove(HttpHeaders.TRANSFER_ENCODING);
}
exchange.getAttributes().put(CLIENT_RESPONSE_HEADER_NAMES,
filteredResponseHeaders.keySet());
response.getHeaders().putAll(filteredResponseHeaders);
return Mono.just(res);
});
Duration responseTimeout = getResponseTimeout(route);
if (responseTimeout != null) {
responseFlux = responseFlux
.timeout(responseTimeout, Mono.error(new TimeoutException(
"Response took longer than timeout: " + responseTimeout)))
.onErrorMap(TimeoutException.class,
th -> new ResponseStatusException(HttpStatus.GATEWAY_TIMEOUT,
th.getMessage(), th));
}
return responseFlux.then(chain.filter(exchange));
}
protected ByteBuf getByteBuf(DataBuffer dataBuffer) {
if (dataBuffer instanceof NettyDataBuffer) {
NettyDataBuffer buffer = (NettyDataBuffer) dataBuffer;
return buffer.getNativeBuffer();
}
// MockServerHttpResponse creates these
else if (dataBuffer instanceof DefaultDataBuffer) {
DefaultDataBuffer buffer = (DefaultDataBuffer) dataBuffer;
return Unpooled.wrappedBuffer(buffer.getNativeBuffer());
}
throw new IllegalArgumentException(
"Unable to handle DataBuffer of type " + dataBuffer.getClass());
}
private void setResponseStatus(HttpClientResponse clientResponse,
ServerHttpResponse response) {
HttpStatus status = HttpStatus.resolve(clientResponse.status().code());
if (status != null) {
response.setStatusCode(status);
}
else {
while (response instanceof ServerHttpResponseDecorator) {
response = ((ServerHttpResponseDecorator) response).getDelegate();
}
if (response instanceof AbstractServerHttpResponse) {
((AbstractServerHttpResponse) response)
.setStatusCodeValue(clientResponse.status().code());
}
else {
// TODO: log warning here, not throw error?
throw new IllegalStateException("Unable to set status code "
+ clientResponse.status().code() + " on response of type "
+ response.getClass().getName());
}
}
}
private HttpClient httpClientWithTimeoutFrom(Route route) {
Integer connectTimeout = (Integer) route.getMetadata().get(CONNECT_TIMEOUT_ATTR);
if (connectTimeout != null) {
return this.httpClient.tcpConfiguration((tcpClient) -> tcpClient
.option(ChannelOption.CONNECT_TIMEOUT_MILLIS, connectTimeout));
}
return httpClient;
}
private Duration getResponseTimeout(Route route) {
Number responseTimeout = (Number) route.getMetadata().get(RESPONSE_TIMEOUT_ATTR);
return responseTimeout != null ? Duration.ofMillis(responseTimeout.longValue())
: properties.getResponseTimeout();
}
}