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io.syndesis.integration.runtime.IntegrationRouteBuilder Maven / Gradle / Ivy
/*
* Copyright (C) 2016 Red Hat, Inc.
*
* 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
*
* http://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 io.syndesis.integration.runtime;
import java.io.IOException;
import java.io.InputStream;
import java.net.URISyntaxException;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Deque;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.BiFunction;
import io.syndesis.common.model.action.StepAction;
import io.syndesis.common.model.integration.Flow;
import io.syndesis.common.model.integration.Flow.FlowType;
import io.syndesis.common.model.integration.Integration;
import io.syndesis.common.model.integration.Scheduler;
import io.syndesis.common.model.integration.Step;
import io.syndesis.common.model.integration.StepKind;
import io.syndesis.common.util.Properties;
import io.syndesis.common.util.KeyGenerator;
import io.syndesis.common.util.Resources;
import io.syndesis.common.util.json.JsonUtils;
import io.syndesis.integration.runtime.capture.OutMessageCaptureProcessor;
import io.syndesis.integration.runtime.logging.IntegrationLoggingConstants;
import org.apache.camel.CamelContext;
import org.apache.camel.Processor;
import org.apache.camel.builder.DefaultErrorHandlerBuilder;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.model.ExpressionNode;
import org.apache.camel.model.LogDefinition;
import org.apache.camel.model.ModelHelper;
import org.apache.camel.model.OnExceptionDefinition;
import org.apache.camel.model.PipelineDefinition;
import org.apache.camel.model.ProcessorDefinition;
import org.apache.camel.model.RouteDefinition;
import org.apache.camel.model.RoutesDefinition;
import org.apache.camel.runtimecatalog.RuntimeCamelCatalog;
import org.apache.camel.spi.RoutePolicy;
import org.apache.camel.util.ObjectHelper;
import org.apache.camel.util.ResourceHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A Camel {@link RouteBuilder} which maps an Integration to Camel routes
*/
@SuppressWarnings("PMD.GodClass")
public class IntegrationRouteBuilder extends RouteBuilder {
private static final Logger LOGGER = LoggerFactory.getLogger(IntegrationRouteBuilder.class);
private final String configurationUri;
private final SourceProvider sourceProvider;
private final List stepHandlerList;
private final Set resources;
private final List activityTrackingPolicyFactories;
public IntegrationRouteBuilder(String configurationUri) {
this(configurationUri, Resources.loadServices(IntegrationStepHandler.class));
}
public IntegrationRouteBuilder(String configurationUri, Collection handlers) {
this(configurationUri, handlers, Collections.emptyList());
}
public IntegrationRouteBuilder(String configurationUri, Collection handlers, List activityTrackingPolicyFactories) {
this.configurationUri = configurationUri;
this.sourceProvider = null;
this.resources = new HashSet<>();
this.stepHandlerList = new ArrayList<>();
this.stepHandlerList.addAll(handlers);
this.activityTrackingPolicyFactories = activityTrackingPolicyFactories;
}
public IntegrationRouteBuilder(SourceProvider sourceProvider, Collection handlers, List activityTrackingPolicyFactories) {
this.configurationUri = null;
this.sourceProvider = sourceProvider;
this.resources = new HashSet<>();
this.stepHandlerList = new ArrayList<>();
this.stepHandlerList.addAll(handlers);
this.activityTrackingPolicyFactories = activityTrackingPolicyFactories;
}
protected Integration loadIntegration() throws IOException {
final Integration integration;
try (InputStream is = createIntegrationInputStream()) {
if (is != null) {
integration = JsonUtils.reader().forType(Integration.class).readValue(is);
} else {
throw new IllegalStateException("Unable to load deployment: " + configurationUri);
}
}
return integration;
}
protected InputStream createIntegrationInputStream() throws IOException {
if (sourceProvider != null) {
try {
return sourceProvider.getSource(getContext());
} catch (Exception e) {
throw ObjectHelper.wrapRuntimeCamelException(e);
}
}
LOGGER.info("Loading integration from: {}", configurationUri);
return ResourceHelper.resolveResourceAsInputStream(getContext().getClassResolver(), configurationUri);
}
@Override
public void configure() throws Exception {
final Integration integration = loadIntegration();
final List flows = integration.getFlows();
for (int f = 0; f < flows.size(); f++) {
configureFlow(flows.get(f), String.valueOf(f));
}
}
private void configureFlow(Flow flow, final String flowIndex) throws URISyntaxException {
final List steps = flow.getSteps();
if (steps.isEmpty()) {
return;
}
final String flowId = flow.getId().orElseGet(KeyGenerator::createKey);
ProcessorDefinition parent = configureRouteScheduler(flow);
final Deque splitStack = new ArrayDeque<>();
for (int stepIndex = 0; stepIndex < steps.size(); stepIndex++) {
final Step step = steps.get(stepIndex);
final Optional nextStep = stepIndex < steps.size() -1 ? Optional.of(steps.get(stepIndex + 1)) : Optional.empty();
final String stepId = step.getId().orElseGet(KeyGenerator::createKey);
final IntegrationStepHandler handler = findHandler(step);
// Load route fragments eventually defined by extensions.
loadFragments(step);
if (parent == null) {
if (!(handler instanceof IntegrationStepHandler.Consumer)) {
throw new IllegalStateException("The handler for step kind " + step.getKind() + " is not a consumer");
}
Optional> definition = handler.handle(step, null, this, flowIndex, String.valueOf(stepIndex));
if (definition.isPresent()) {
parent = definition.get();
parent = configureRouteDefinition(parent, flow, flowId, stepId);
parent = createPipeline(parent, stepId);
parent = parent.setHeader(IntegrationLoggingConstants.FLOW_ID, constant(flowId));
parent = parent.end();
if (nextStep.map(Step::getStepKind)
.map(kind -> kind.equals(StepKind.split)).orElse(false)) {
parent = findHandler(nextStep.get()).handle(nextStep.get(), parent, this, flowIndex, String.valueOf(stepIndex)).orElse(parent);
String splitStepId = nextStep.get().getId().orElseGet(KeyGenerator::createKey);
splitStack.push(splitStepId);
parent.id(getStepId(splitStepId));
parent = captureOutMessage(parent, splitStepId);
stepIndex++;
} else {
parent = captureOutMessage(parent, stepId);
}
}
} else {
parent = configureRouteDefinition(parent, flow, flowId, stepId);
if (StepKind.aggregate.equals(step.getStepKind())) {
if (!splitStack.isEmpty()) {
String splitStepId = splitStack.pop();
while (!getStepId(splitStepId).equals(parent.getId())) {
if (parent instanceof ExpressionNode) {
parent = parent.end();
parent = parent.endParent();
} else {
parent = parent.getParent();
}
}
if (parent instanceof ExpressionNode) {
parent = parent.end();
parent = parent.endParent();
}
parent = handler.handle(step, parent, this, flowIndex, String.valueOf(stepIndex)).orElse(parent);
parent = captureOutMessage(parent, stepId);
}
} else {
if (stepIndex == 0) {
// If parent is not null and this is the first step, a scheduler
// has been created as route initiator so now its is time to set the flow id
parent = createPipeline(parent, stepId);
parent = parent.setHeader(IntegrationLoggingConstants.FLOW_ID, constant(flowId));
parent = parent.end();
} else {
parent = createPipeline(parent, stepId);
}
parent = handler.handle(step, parent, this, flowIndex, String.valueOf(stepIndex)).orElse(parent);
if (nextStep.map(Step::getStepKind)
.map(kind -> kind.equals(StepKind.split)).orElse(false)) {
if (stepIndex > 0) {
parent = closeParent(parent, stepId, (processorDefinition, id) -> processorDefinition);
}
parent = findHandler(nextStep.get()).handle(nextStep.get(), parent, this, flowIndex, String.valueOf(stepIndex)).orElse(parent);
String splitStepId = nextStep.get().getId().orElseGet(KeyGenerator::createKey);
splitStack.push(splitStepId);
parent.id(getStepId(splitStepId));
parent = captureOutMessage(parent, splitStepId);
stepIndex++;
} else {
parent = closeParent(parent, stepId, this::captureOutMessage);
}
}
}
}
}
private ProcessorDefinition closeParent(final ProcessorDefinition parent, final String stepId,
final BiFunction, String, ProcessorDefinition> fallback) {
ProcessorDefinition definition;
if (parent instanceof PipelineDefinition) {
definition = captureOutMessage(parent, stepId);
definition = parent.end();
} else if (parent instanceof ExpressionNode) {
definition = captureOutMessage(parent, stepId);
definition = parent.endParent();
} else {
definition = fallback.apply(parent, stepId);
}
return definition;
}
/**
* Adds out message capture message processor to save current message to memory for later usage.
* @param parent
* @param stepId
* @return
*/
private ProcessorDefinition captureOutMessage(final ProcessorDefinition parent, String stepId) {
ProcessorDefinition definition;
if (parent instanceof PipelineDefinition &&
ObjectHelper.isNotEmpty(parent.getOutputs())) {
ProcessorDefinition lastInPipeline = parent.getOutputs().get(parent.getOutputs().size() - 1);
if (lastInPipeline instanceof LogDefinition) {
// skip our message capture for log steps
return parent;
}
} else {
// not in a pipeline so set the step id header to be sure it is there
definition = parent.setHeader(IntegrationLoggingConstants.STEP_ID, constant(stepId));
}
definition = parent.process(OutMessageCaptureProcessor.INSTANCE)
.id(String.format("capture-out:%s", stepId));
return definition;
}
private ProcessorDefinition configureRouteDefinition(ProcessorDefinition definition, Flow flow, String flowId, String stepId) {
if (definition instanceof RouteDefinition) {
final RouteDefinition rd = (RouteDefinition)definition;
if (containsConfiguredActivityTrackingPolicies(rd)) {
// Route has already been configured so no need to go ahead
return definition;
}
if (ObjectHelper.isNotEmpty(flow.getName())) {
rd.routeDescription(flow.getName());
}
rd.routeId(flowId);
for (ActivityTrackingPolicyFactory factory : activityTrackingPolicyFactories) {
if (factory.appliesTo(flow)) {
rd.routePolicy(factory.createRoutePolicy(flowId));
}
}
rd.getInputs().get(0).id(stepId);
//Adding an errorHandler on API-Provider integrations
if (FlowType.API_PROVIDER.equals(flow.getType())) {
final OnExceptionDefinition onException = new OnExceptionDefinition(Throwable.class)
.handled(true)
.maximumRedeliveries(0);
final Processor errorHandler = (Processor) mandatoryLoadResource(
this.getContext(), "class:io.syndesis.connector.apiprovider.ApiProviderOnExceptionHandler");
final Step endStep = flow.getSteps().get(flow.getSteps().size()-1);
((Properties) errorHandler).setProperties(endStep.getConfiguredProperties());
final DefaultErrorHandlerBuilder builder = new DefaultErrorHandlerBuilder();
builder.setExceptionPolicyStrategy((exceptionPolicies, exchange, exception) -> onException);
builder.setOnExceptionOccurred(errorHandler);
rd.setErrorHandlerBuilder(builder);
}
}
return definition;
}
/**
* Checks if given route definition has already been configured with activity tracking policies.
* @param routeDefinition the route definition to evaluate.
* @return true if activity tracking policies have already been configured on given route definition.
*/
private boolean containsConfiguredActivityTrackingPolicies(RouteDefinition routeDefinition) {
List routePolicies = routeDefinition.getRoutePolicies();
if (ObjectHelper.isEmpty(routePolicies)) {
return false;
}
return activityTrackingPolicyFactories.stream().anyMatch(policyFactory -> routePolicies.stream().anyMatch(policyFactory::isInstance));
}
private ProcessorDefinition createPipeline(ProcessorDefinition parent, String stepId) {
return parent.pipeline()
.id(getStepId(stepId))
.setHeader(IntegrationLoggingConstants.STEP_ID, constant(stepId));
}
private static String getStepId(String stepId) {
return String.format("step:%s", stepId);
}
/**
* If the integration has a scheduler, start the route with a timer or quartz2
* endpoint.
*/
private ProcessorDefinition configureRouteScheduler(final Flow flow) throws URISyntaxException {
if (flow.getScheduler().isPresent()) {
Scheduler scheduler = flow.getScheduler().get();
// We now support simple timer only, cron support will be supported
// later on.
if (scheduler.isTimer()) {
Map properties = new HashMap<>();
properties.put("timerName", "integration");
properties.put("period", scheduler.getExpression());
final RuntimeCamelCatalog catalog = getContext().getRuntimeCamelCatalog();
final String uri = catalog.asEndpointUri("timer", properties, false);
RouteDefinition route = this.from(uri);
route.getInputs().get(0).setId("integration-scheduler");
flow.getId().ifPresent(route::setId);
return route;
}
throw new IllegalArgumentException("Unsupported scheduler type: " + scheduler.getType());
}
return null;
}
private void loadFragments(Step step) {
if (StepKind.extension != step.getStepKind()) {
return;
}
final StepAction action = step.getActionAs(StepAction.class)
.orElseThrow(() -> new IllegalArgumentException(
String.format("Missing step action on step: %s - %s", step.getId(), step.getName())));
if (action.getDescriptor().getKind() == StepAction.Kind.ENDPOINT) {
final CamelContext context = getContext();
final String resource = action.getDescriptor().getResource();
if (ObjectHelper.isNotEmpty(resource) && resources.add(resource)) {
final Object instance = mandatoryLoadResource(context, resource);
final RoutesDefinition definitions = mandatoryConvertToRoutesDefinition(resource, instance);
LOGGER.debug("Resolved resource: {} as {}", resource, instance.getClass());
try {
context.addRouteDefinitions(definitions.getRoutes());
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
}
}
// Visibility changed for test purpose.
protected IntegrationStepHandler findHandler(Step step) {
for (IntegrationStepHandler handler : stepHandlerList) {
if (handler.canHandle(step)) {
LOGGER.debug("Step kind: {}, handler: {}", step.getStepKind(), handler.getClass().getName());
return handler;
}
}
throw new IllegalStateException("Unsupported step kind: " + step.getStepKind());
}
private static Object mandatoryLoadResource(CamelContext context, String resource) {
Object instance = null;
if (resource.startsWith("classpath:")) {
try (InputStream is = ResourceHelper.resolveMandatoryResourceAsInputStream(context, resource)) {
instance = ModelHelper.loadRoutesDefinition(context, is);
} catch (Exception e) {
throw new IllegalArgumentException(e);
}
} else if (resource.startsWith("class:")) {
Class type = context.getClassResolver().resolveClass(resource.substring("class:".length()));
instance = context.getInjector().newInstance(type);
} else if (resource.startsWith("bean:")) {
instance = context.getRegistry().lookupByName(resource.substring("bean:".length()));
}
if (instance == null) {
throw new IllegalArgumentException("Unable to resolve resource: " + resource);
}
return instance;
}
private static RoutesDefinition mandatoryConvertToRoutesDefinition(String resource, Object instance) {
final RoutesDefinition definitions;
if (instance instanceof RoutesDefinition) {
definitions = (RoutesDefinition)instance;
} else if (instance instanceof RouteDefinition) {
definitions = new RoutesDefinition();
definitions.route((RouteDefinition)instance);
} else if (instance instanceof RouteBuilder) {
RouteBuilder builder = (RouteBuilder)instance;
try {
builder.configure();
definitions = builder.getRouteCollection();
} catch (Exception e) {
LOGGER.warn("Unable to configure resource: " + resource, e);
throw ObjectHelper.wrapRuntimeCamelException(e);
}
} else {
throw new IllegalArgumentException("Unable to convert instance: " + instance);
}
return definitions;
}
}
