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io.scalecube.services.methods.ServiceMethodInvoker Maven / Gradle / Ivy
package io.scalecube.services.methods;
import static io.scalecube.services.auth.Authenticator.AUTH_CONTEXT_KEY;
import static io.scalecube.services.auth.Authenticator.NULL_AUTH_CONTEXT;
import io.scalecube.services.api.ServiceMessage;
import io.scalecube.services.auth.Authenticator;
import io.scalecube.services.auth.PrincipalMapper;
import io.scalecube.services.exceptions.BadRequestException;
import io.scalecube.services.exceptions.ServiceException;
import io.scalecube.services.exceptions.ServiceProviderErrorMapper;
import io.scalecube.services.exceptions.UnauthorizedException;
import io.scalecube.services.transport.api.ServiceMessageDataDecoder;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.StringJoiner;
import org.reactivestreams.Publisher;
import org.slf4j.Logger;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.util.context.Context;
public final class ServiceMethodInvoker {
private final Method method;
private final Object service;
private final MethodInfo methodInfo;
private final ServiceProviderErrorMapper errorMapper;
private final ServiceMessageDataDecoder dataDecoder;
private final Authenticator authenticator;
private final PrincipalMapper principalMapper;
private final Logger logger;
public ServiceMethodInvoker(
Method method,
Object service,
MethodInfo methodInfo,
ServiceProviderErrorMapper errorMapper,
ServiceMessageDataDecoder dataDecoder,
Authenticator authenticator,
PrincipalMapper principalMapper,
Logger logger) {
this.method = Objects.requireNonNull(method, "method");
this.service = Objects.requireNonNull(service, "service");
this.methodInfo = Objects.requireNonNull(methodInfo, "methodInfo");
this.errorMapper = Objects.requireNonNull(errorMapper, "errorMapper");
this.dataDecoder = Objects.requireNonNull(dataDecoder, "dataDecoder");
this.authenticator = authenticator;
this.principalMapper = principalMapper;
this.logger = logger;
}
/**
* Invokes service method with single response.
*
* @param message request service message
* @return mono of service message
*/
public Mono invokeOne(ServiceMessage message) {
return Mono.deferContextual(context -> authenticate(message, (Context) context))
.flatMap(authData -> invokeOne(message, authData))
.map(response -> toResponse(response, message.qualifier(), message.dataFormat()))
.onErrorResume(
throwable -> Mono.just(errorMapper.toMessage(message.qualifier(), throwable)))
.subscribeOn(methodInfo.scheduler());
}
private Mono invokeOne(ServiceMessage message, Object authData) {
return Mono.deferContextual(
context -> {
final var request = toRequest(message);
final var qualifier = message.qualifier();
return Mono.from(invokeRequest(request))
.doOnSuccess(
response -> {
if (logger != null && logger.isDebugEnabled()) {
logger.debug(
"[{}] request: {}, response: {}", qualifier, request, response);
}
})
.doOnError(
ex -> {
if (logger != null) {
logger.error("[{}] request: {}", qualifier, request, ex);
}
});
})
.contextWrite(context -> enhanceWithRequestContext(context, message))
.contextWrite(context -> enhanceWithAuthContext(context, authData));
}
/**
* Invokes service method with message stream response.
*
* @param message request service message
* @return flux of service messages
*/
public Flux invokeMany(ServiceMessage message) {
return Mono.deferContextual(context -> authenticate(message, (Context) context))
.flatMapMany(authData -> invokeMany(message, authData))
.map(response -> toResponse(response, message.qualifier(), message.dataFormat()))
.onErrorResume(
throwable -> Flux.just(errorMapper.toMessage(message.qualifier(), throwable)))
.subscribeOn(methodInfo.scheduler());
}
private Flux invokeMany(ServiceMessage message, Object authData) {
return Flux.deferContextual(
context -> {
final var request = toRequest(message);
final var qualifier = message.qualifier();
return Flux.from(invokeRequest(request))
.doOnSubscribe(
s -> {
if (logger != null && logger.isDebugEnabled()) {
logger.debug("[{}] request: {}", qualifier, request);
}
})
.doOnError(
ex -> {
if (logger != null) {
logger.error("[{}] request: {}", qualifier, request, ex);
}
});
})
.contextWrite(context -> enhanceWithRequestContext(context, message))
.contextWrite(context -> enhanceWithAuthContext(context, authData));
}
/**
* Invokes service method with bidirectional communication.
*
* @param publisher request service message
* @return flux of service messages
*/
public Flux invokeBidirectional(Publisher publisher) {
return Flux.from(publisher)
.switchOnFirst(
(first, messages) ->
Mono.deferContextual(context -> authenticate(first.get(), (Context) context))
.flatMapMany(authData -> invokeBidirectional(messages, authData))
.map(
response ->
toResponse(response, first.get().qualifier(), first.get().dataFormat()))
.onErrorResume(
throwable ->
Flux.just(errorMapper.toMessage(first.get().qualifier(), throwable)))
.subscribeOn(methodInfo.scheduler()));
}
private Flux invokeBidirectional(Flux messages, Object authData) {
return Flux.deferContextual(
context -> messages.map(this::toRequest).transform(this::invokeRequest))
.contextWrite(context -> enhanceWithAuthContext(context, authData));
}
private Publisher invokeRequest(Object request) {
Publisher result = null;
Throwable throwable = null;
try {
if (methodInfo.parameterCount() == 0) {
result = (Publisher) method.invoke(service);
} else {
Object[] arguments = prepareArguments(request);
result = (Publisher) method.invoke(service, arguments);
}
if (result == null) {
result = Mono.empty();
}
} catch (InvocationTargetException ex) {
throwable = Optional.ofNullable(ex.getCause()).orElse(ex);
} catch (Throwable ex) {
throwable = ex;
}
return throwable != null ? Mono.error(throwable) : result;
}
private Object[] prepareArguments(Object request) {
Object[] arguments = new Object[methodInfo.parameterCount()];
if (methodInfo.requestType() != Void.TYPE) {
arguments[0] = request;
}
return arguments;
}
private Mono authenticate(ServiceMessage message, Context context) {
if (!methodInfo.isSecured()) {
return Mono.just(NULL_AUTH_CONTEXT);
}
if (authenticator == null) {
if (context.hasKey(AUTH_CONTEXT_KEY)) {
return Mono.just(context.get(AUTH_CONTEXT_KEY));
} else {
throw new UnauthorizedException("Authentication failed");
}
}
return authenticator
.apply(message.headers())
.switchIfEmpty(Mono.just(NULL_AUTH_CONTEXT))
.onErrorMap(ServiceMethodInvoker::toUnauthorizedException);
}
private static UnauthorizedException toUnauthorizedException(Throwable th) {
if (th instanceof ServiceException e) {
return new UnauthorizedException(e.errorCode(), e.getMessage());
} else {
return new UnauthorizedException(th);
}
}
private Context enhanceWithAuthContext(Context context, Object authData) {
if (authData == NULL_AUTH_CONTEXT || principalMapper == null) {
return context.put(AUTH_CONTEXT_KEY, authData);
} else {
final var principal = principalMapper.apply(authData);
return context.put(AUTH_CONTEXT_KEY, principal != null ? principal : NULL_AUTH_CONTEXT);
}
}
private Context enhanceWithRequestContext(Context context, ServiceMessage message) {
final var headers = message.headers();
final var principal = context.get(AUTH_CONTEXT_KEY);
final var dynamicQualifier = methodInfo.dynamicQualifier();
Map pathVars = null;
if (dynamicQualifier != null) {
pathVars = dynamicQualifier.matchQualifier(message.qualifier());
}
return context.put(RequestContext.class, new RequestContext(headers, principal, pathVars));
}
private Object toRequest(ServiceMessage message) {
ServiceMessage request = dataDecoder.apply(message, methodInfo.requestType());
if (!methodInfo.isRequestTypeVoid()
&& !methodInfo.isRequestTypeServiceMessage()
&& !request.hasData(methodInfo.requestType())) {
Optional dataOptional = Optional.ofNullable(request.data());
Class clazz = dataOptional.map(Object::getClass).orElse(null);
throw new BadRequestException(
String.format(
"Expected service request data of type: %s, but received: %s",
methodInfo.requestType(), clazz));
}
return methodInfo.isRequestTypeServiceMessage() ? request : request.data();
}
private static ServiceMessage toResponse(Object response, String qualifier, String dataFormat) {
if (response instanceof ServiceMessage message) {
if (dataFormat != null && !dataFormat.equals(message.dataFormat())) {
return ServiceMessage.from(message).qualifier(qualifier).dataFormat(dataFormat).build();
}
return ServiceMessage.from(message).qualifier(qualifier).build();
}
return ServiceMessage.builder()
.qualifier(qualifier)
.data(response)
.dataFormatIfAbsent(dataFormat)
.build();
}
public Object service() {
return service;
}
public MethodInfo methodInfo() {
return methodInfo;
}
@Override
public String toString() {
return new StringJoiner(", ", ServiceMethodInvoker.class.getSimpleName() + "[", "]")
.add("method=" + method)
.add("service=" + service)
.add("methodInfo=" + methodInfo)
.add("errorMapper=" + errorMapper)
.add("dataDecoder=" + dataDecoder)
.add("authenticator=" + authenticator)
.add("principalMapper=" + principalMapper)
.add("logger=" + logger)
.toString();
}
}
