spring cloud gateway 自定义负载均衡
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相关类及接口
LoadbalancerClientFilter:使用ribbon负载均衡,默认使用该类(已不推荐使用)
/** @deprecated */
@Deprecated
public class LoadBalancerClientFilter implements GlobalFilter, Ordered {
public static final int LOAD_BALANCER_CLIENT_FILTER_ORDER = 10100;
private static final Log log = LogFactory.getLog(LoadBalancerClientFilter.class);
protected final LoadBalancerClient loadBalancer;
private LoadBalancerProperties properties;
public LoadBalancerClientFilter(LoadBalancerClient loadBalancer, LoadBalancerProperties properties) {
this.loadBalancer = loadBalancer;
this.properties = properties;
}
public int getOrder() {
return 10100;
}
public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
URI url = (URI)exchange.getAttribute(ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR);
String schemePrefix = (String)exchange.getAttribute(ServerWebExchangeUtils.GATEWAY_SCHEME_PREFIX_ATTR);
if (url != null && ("lb".equals(url.getScheme()) || "lb".equals(schemePrefix))) {
ServerWebExchangeUtils.addOriginalRequestUrl(exchange, url);
if (log.isTraceEnabled()) {
log.trace("LoadBalancerClientFilter url before: " + url);
}
ServiceInstance instance = this.choose(exchange);
if (instance == null) {
throw NotFoundException.create(this.properties.isUse404(), "Unable to find instance for " + url.getHost());
} else {
URI uri = exchange.getRequest().getURI();
String overrideScheme = instance.isSecure() ? "https" : "http";
if (schemePrefix != null) {
overrideScheme = url.getScheme();
}
URI requestUrl = this.loadBalancer.reconstructURI(new DelegatingServiceInstance(instance, overrideScheme), uri);
if (log.isTraceEnabled()) {
log.trace("LoadBalancerClientFilter url chosen: " + requestUrl);
}
exchange.getAttributes().put(ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR, requestUrl);
return chain.filter(exchange);
}
} else {
return chain.filter(exchange);
}
}
protected ServiceInstance choose(ServerWebExchange exchange) {
return this.loadBalancer.choose(((URI)exchange.getAttribute(ServerWebExchangeUtils.GATEWAY_REQUEST_URL_ATTR)).getHost());
}
}
说明:默认使用该类,可通过下述方法使用ReactiveLoadbalancerClientFilter
"You already have RibbonLoadBalancerClient on your classpath. It will be used by default.
As Spring Cloud Ribbon is in maintenance mode. We recommend switching to " + BlockingLoadBalancerClient.class.getSimpleName() + " instead.
In order to use it, set the value of `spring.cloud.loadbala