package org.springframework.boot.actuate.web.mappings.reactive;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import reactor.core.publisher.Mono;
import org.springframework.boot.actuate.web.mappings.HandlerMethodDescription;
import org.springframework.boot.actuate.web.mappings.MappingDescriptionProvider;
import org.springframework.context.ApplicationContext;
import org.springframework.core.io.Resource;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.reactive.DispatcherHandler;
import org.springframework.web.reactive.HandlerMapping;
import org.springframework.web.reactive.function.server.HandlerFunction;
import org.springframework.web.reactive.function.server.RequestPredicate;
import org.springframework.web.reactive.function.server.RouterFunction;
import org.springframework.web.reactive.function.server.RouterFunctions.Visitor;
import org.springframework.web.reactive.function.server.ServerRequest;
import org.springframework.web.reactive.function.server.support.RouterFunctionMapping;
import org.springframework.web.reactive.handler.AbstractUrlHandlerMapping;
import org.springframework.web.reactive.result.method.RequestMappingInfo;
import org.springframework.web.reactive.result.method.RequestMappingInfoHandlerMapping;
import org.springframework.web.util.pattern.PathPattern;
public class DispatcherHandlersMappingDescriptionProvider implements MappingDescriptionProvider {
private static final List<HandlerMappingDescriptionProvider<? extends HandlerMapping>> descriptionProviders = Arrays
.asList(new RequestMappingInfoHandlerMappingDescriptionProvider(),
new UrlHandlerMappingDescriptionProvider(), new RouterFunctionMappingDescriptionProvider());
@Override
public String getMappingName() {
return "dispatcherHandlers";
}
@Override
public Map<String, List<DispatcherHandlerMappingDescription>> describeMappings(ApplicationContext context) {
Map<String, List<DispatcherHandlerMappingDescription>> mappings = new HashMap<>();
context.getBeansOfType(DispatcherHandler.class)
.forEach((name, handler) -> mappings.put(name, describeMappings(handler)));
return mappings;
}
private List<DispatcherHandlerMappingDescription> describeMappings(DispatcherHandler dispatcherHandler) {
return dispatcherHandler.getHandlerMappings().stream().flatMap(this::describe).collect(Collectors.toList());
}
@SuppressWarnings("unchecked")
private <T extends HandlerMapping> Stream<DispatcherHandlerMappingDescription> describe(T handlerMapping) {
for (HandlerMappingDescriptionProvider<?> descriptionProvider : descriptionProviders) {
if (descriptionProvider.getMappingClass().isInstance(handlerMapping)) {
return ((HandlerMappingDescriptionProvider<T>) descriptionProvider).describe(handlerMapping).stream();
}
}
return Stream.empty();
}
private interface HandlerMappingDescriptionProvider<T extends HandlerMapping> {
Class<T> getMappingClass();
List<DispatcherHandlerMappingDescription> describe(T handlerMapping);
}
private static final class RequestMappingInfoHandlerMappingDescriptionProvider
implements HandlerMappingDescriptionProvider<RequestMappingInfoHandlerMapping> {
@Override
public Class<RequestMappingInfoHandlerMapping> getMappingClass() {
return RequestMappingInfoHandlerMapping.class;
}
@Override
public List<DispatcherHandlerMappingDescription> describe(RequestMappingInfoHandlerMapping handlerMapping) {
Map<RequestMappingInfo, HandlerMethod> handlerMethods = handlerMapping.getHandlerMethods();
return handlerMethods.entrySet().stream().map(this::describe).collect(Collectors.toList());
}
private DispatcherHandlerMappingDescription describe(Entry<RequestMappingInfo, HandlerMethod> mapping) {
DispatcherHandlerMappingDetails handlerMapping = new DispatcherHandlerMappingDetails();
handlerMapping.setHandlerMethod(new HandlerMethodDescription(mapping.getValue()));
handlerMapping.setRequestMappingConditions(new RequestMappingConditionsDescription(mapping.getKey()));
return new DispatcherHandlerMappingDescription(mapping.getKey().toString(), mapping.getValue().toString(),
handlerMapping);
}
}
private static final class UrlHandlerMappingDescriptionProvider
implements HandlerMappingDescriptionProvider<AbstractUrlHandlerMapping> {
@Override
public Class<AbstractUrlHandlerMapping> getMappingClass() {
return AbstractUrlHandlerMapping.class;
}
@Override
public List<DispatcherHandlerMappingDescription> describe(AbstractUrlHandlerMapping handlerMapping) {
return handlerMapping.getHandlerMap().entrySet().stream().map(this::describe).collect(Collectors.toList());
}
private DispatcherHandlerMappingDescription describe(Entry<PathPattern, Object> mapping) {
return new DispatcherHandlerMappingDescription(mapping.getKey().getPatternString(),
mapping.getValue().toString(), null);
}
}
private static final class RouterFunctionMappingDescriptionProvider
implements HandlerMappingDescriptionProvider<RouterFunctionMapping> {
@Override
public Class<RouterFunctionMapping> getMappingClass() {
return RouterFunctionMapping.class;
}
@Override
public List<DispatcherHandlerMappingDescription> describe(RouterFunctionMapping handlerMapping) {
MappingDescriptionVisitor visitor = new MappingDescriptionVisitor();
RouterFunction<?> routerFunction = handlerMapping.getRouterFunction();
if (routerFunction != null) {
routerFunction.accept(visitor);
}
return visitor.descriptions;
}
}
private static final class MappingDescriptionVisitor implements Visitor {
private final List<DispatcherHandlerMappingDescription> descriptions = new ArrayList<>();
@Override
public void startNested(RequestPredicate predicate) {
}
@Override
public void endNested(RequestPredicate predicate) {
}
@Override
public void route(RequestPredicate predicate, HandlerFunction<?> handlerFunction) {
DispatcherHandlerMappingDetails details = new DispatcherHandlerMappingDetails();
details.setHandlerFunction(new HandlerFunctionDescription(handlerFunction));
this.descriptions.add(
new DispatcherHandlerMappingDescription(predicate.toString(), handlerFunction.toString(), details));
}
@Override
public void resources(Function<ServerRequest, Mono<Resource>> lookupFunction) {
}
@Override
public void unknown(RouterFunction<?> routerFunction) {
}
}
}