Add handling of downstream automation events

src/main/java/org/hibernate/infra/replicate/jira/JiraConfig.java

@@ -192,6 +192,11 @@ interface JiraProject {
 		 * Allows enabling signature verification.
 		 */
 		WebHookSecurity security();
+
+		/**
+		 * Allows enabling signature verification of downstream events.
+		 */
+		WebHookSecurity downstreamSecurity();
 	}
 
 	interface WebHookSecurity {
@@ -205,11 +210,20 @@ interface WebHookSecurity {
 		@WithDefault("false")
 		boolean enabled();
 
+		@WithDefault("SIGNATURE")
+		Type type();
+
 		/**
-		 * The secret used to sing the web hook request body.
+		 * Verification secret, e.g. the secret used to sing the web hook request body.
+		 * Can also be just some token that we will compare. Depends on the security
+		 * type.
 		 */
 		@WithDefault("not-a-secret")
 		String secret();
+
+		enum Type {
+			SIGNATURE, TOKEN
+		}
 	}
 
 	interface Instance {
@@ -374,6 +388,9 @@ interface UserValueMapping extends ValueMapping {
 		 */
 		@WithDefault("not-a-user")
 		Set<String> ignoredUpstreamUsers();
+
+		@WithDefault("not-a-user")
+		Set<String> ignoredDownstreamUsers();
 	}
 
 	/**

src/main/java/org/hibernate/infra/replicate/jira/resource/JiraWebHookListenerResource.java

@@ -1,6 +1,7 @@
 package org.hibernate.infra.replicate.jira.resource;
 
 import org.hibernate.infra.replicate.jira.service.jira.JiraService;
+import org.hibernate.infra.replicate.jira.service.jira.model.action.JiraActionEvent;
 import org.hibernate.infra.replicate.jira.service.jira.model.hook.JiraWebHookEvent;
 import org.hibernate.infra.replicate.jira.service.validation.ConfiguredProject;
 
@@ -30,4 +31,14 @@ public String somethingHappenedUpstream(@RestPath @NotNull @ConfiguredProject St
 		jiraService.acknowledge(project, event, triggeredByUser);
 		return "ack";
 	}
+
+	@POST
+	@Path("/downstream/{project}")
+	@Consumes(MediaType.APPLICATION_JSON)
+	public String somethingHappenedDownstream(@RestPath @NotNull @ConfiguredProject(upstream = false) String project,
+			JiraActionEvent data) {
+		Log.infof("Received a downstream notification about %s project: %s...", project, data);
+		jiraService.downstreamAcknowledge(project, data);
+		return "ack";
+	}
 }

src/main/java/org/hibernate/infra/replicate/jira/service/jira/HandlerProjectContext.java

@@ -181,6 +181,10 @@ public void startProcessingEvent() throws InterruptedException {
 		projectGroupContext.startProcessingEvent();
 	}
 
+	public void startProcessingDownstreamEvent() throws InterruptedException {
+		projectGroupContext.startProcessingDownstreamEvent();
+	}
+
 	public JiraUser notMappedAssignee() {
 		return notMappedAssignee;
 	}
@@ -229,6 +233,14 @@ public void submitTask(Runnable runnable) {
 		projectGroupContext.submitTask(runnable);
 	}
 
+	public int pendingDownstreamEventsInCurrentContext() {
+		return projectGroupContext.pendingDownstreamEventsInCurrentContext();
+	}
+
+	public void submitDownstreamTask(Runnable runnable) {
+		projectGroupContext.submitDownstreamTask(runnable);
+	}
+
 	public Optional<HandlerProjectContext> contextForProjectInSameGroup(String project) {
 		if (!projectGroup().projects().containsKey(project)) {
 			// different project group, don't bother
@@ -351,4 +363,12 @@ private static boolean versionNeedsUpdate(JiraVersion upstreamVersion, JiraVersi
 	public boolean isUserIgnored(String triggeredByUser) {
 		return projectGroupContext.projectGroup().users().ignoredUpstreamUsers().contains(triggeredByUser);
 	}
+
+	public boolean isDownstreamUserIgnored(String triggeredByUser) {
+		return projectGroupContext.projectGroup().users().ignoredDownstreamUsers().contains(triggeredByUser);
+	}
+
+	public String upstreamUser(String mappedValue) {
+		return projectGroupContext.upstreamUser(mappedValue);
+	}
 }

src/main/java/org/hibernate/infra/replicate/jira/service/jira/HandlerProjectGroupContext.java

@@ -1,5 +1,8 @@
 package org.hibernate.infra.replicate.jira.service.jira;
 
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.LinkedBlockingDeque;
@@ -17,9 +20,14 @@ public final class HandlerProjectGroupContext implements AutoCloseable {
 
 	private final ExecutorService eventHandlingExecutor;
 	private final Supplier<Integer> workQueueSize;
+
+	private final ExecutorService downstreamEventHandlingExecutor;
+	private final Supplier<Integer> downstreamWorkQueueSize;
 	private final ScheduledExecutorService rateLimiterExecutor = Executors.newScheduledThreadPool(1);
 	private final Semaphore rateLimiter;
+	private final Semaphore downstreamRateLimiter;
 	private final JiraConfig.JiraProjectGroup projectGroup;
+	private final Map<String, String> invertedUsers;
 
 	public HandlerProjectGroupContext(JiraConfig.JiraProjectGroup projectGroup) {
 		this.projectGroup = projectGroup;
@@ -28,21 +36,39 @@ public HandlerProjectGroupContext(JiraConfig.JiraProjectGroup projectGroup) {
 
 		final int permits = processing.eventsPerTimeframe();
 		this.rateLimiter = new Semaphore(permits);
+		this.downstreamRateLimiter = new Semaphore(permits);
 		rateLimiterExecutor.scheduleAtFixedRate(() -> {
 			rateLimiter.drainPermits();
 			rateLimiter.release(permits);
+			downstreamRateLimiter.drainPermits();
+			downstreamRateLimiter.release(permits);
 		}, processing.timeframeInSeconds(), processing.timeframeInSeconds(), TimeUnit.SECONDS);
 
 		LinkedBlockingDeque<Runnable> workQueue = new LinkedBlockingDeque<>(processing.queueSize());
 		workQueueSize = workQueue::size;
 		eventHandlingExecutor = new ThreadPoolExecutor(processing.threads(), processing.threads(), 0L,
 				TimeUnit.MILLISECONDS, workQueue);
+
+		LinkedBlockingDeque<Runnable> downstreamWorkQueue = new LinkedBlockingDeque<>(processing.queueSize());
+		downstreamWorkQueueSize = downstreamWorkQueue::size;
+		downstreamEventHandlingExecutor = new ThreadPoolExecutor(processing.threads(), processing.threads(), 0L,
+				TimeUnit.MILLISECONDS, downstreamWorkQueue);
+
+		Map<String, String> invertedUsers = new HashMap<>();
+		for (var entry : projectGroup.users().mapping().entrySet()) {
+			invertedUsers.put(entry.getValue(), entry.getKey());
+		}
+		this.invertedUsers = Collections.unmodifiableMap(invertedUsers);
 	}
 
 	public void startProcessingEvent() throws InterruptedException {
 		rateLimiter.acquire(1);
 	}
 
+	public void startProcessingDownstreamEvent() throws InterruptedException {
+		downstreamRateLimiter.acquire(1);
+	}
+
 	public JiraConfig.JiraProjectGroup projectGroup() {
 		return projectGroup;
 	}
@@ -51,26 +77,43 @@ public int pendingEventsInCurrentContext() {
 		return workQueueSize.get();
 	}
 
+	public int pendingDownstreamEventsInCurrentContext() {
+		return downstreamWorkQueueSize.get();
+	}
+
 	public void submitTask(Runnable task) {
 		eventHandlingExecutor.submit(task);
 	}
 
+	public void submitDownstreamTask(Runnable task) {
+		downstreamEventHandlingExecutor.submit(task);
+	}
+
 	@Override
 	public void close() {
 		// when requesting to close the context we aren't expecting to process any other
 		// events hence there's no point in continuing "releasing" more "permits":
 		if (!rateLimiterExecutor.isShutdown()) {
 			rateLimiterExecutor.shutdownNow();
 		}
-		if (!eventHandlingExecutor.isShutdown()) {
+		closeEventExecutor(eventHandlingExecutor);
+		closeEventExecutor(downstreamEventHandlingExecutor);
+	}
+
+	private static void closeEventExecutor(ExecutorService executor) {
+		if (!executor.isShutdown()) {
 			try {
-				eventHandlingExecutor.shutdown();
-				if (!eventHandlingExecutor.awaitTermination(2, TimeUnit.MINUTES)) {
+				executor.shutdown();
+				if (!executor.awaitTermination(2, TimeUnit.MINUTES)) {
 					Log.warnf("Not all events were processed before the shutdown");
 				}
 			} catch (InterruptedException e) {
 				Thread.currentThread().interrupt();
 			}
 		}
 	}
+
+	public String upstreamUser(String mappedValue) {
+		return invertedUsers.get(mappedValue);
+	}
 }

src/main/java/org/hibernate/infra/replicate/jira/service/jira/JiraService.java

@@ -18,6 +18,7 @@
 import org.hibernate.infra.replicate.jira.service.jira.handler.JiraIssueDeleteEventHandler;
 import org.hibernate.infra.replicate.jira.service.jira.handler.JiraIssueSimpleUpsertEventHandler;
 import org.hibernate.infra.replicate.jira.service.jira.handler.JiraIssueTransitionOnlyEventHandler;
+import org.hibernate.infra.replicate.jira.service.jira.model.action.JiraActionEvent;
 import org.hibernate.infra.replicate.jira.service.jira.model.hook.JiraWebHookEvent;
 import org.hibernate.infra.replicate.jira.service.jira.model.hook.JiraWebHookIssue;
 import org.hibernate.infra.replicate.jira.service.jira.model.hook.JiraWebHookIssueLink;
@@ -322,6 +323,29 @@ public void acknowledge(String project, JiraWebHookEvent event, String triggered
 		}, () -> Log.infof("Event type %s is not supported and cannot be handled.", event.webhookEvent));
 	}
 
+	public void downstreamAcknowledge(String project, JiraActionEvent event) {
+		event.eventType().ifPresentOrElse(eventType -> {
+			var context = contextPerProject.get(project);
+			if (context == null) {
+				FailureCollector failureCollector = FailureCollector.collector(reportingConfig);
+				failureCollector.critical("Unable to determine handler context for project %s. Was it not configured ?"
+						.formatted(project));
+				failureCollector.close();
+				throw new ConstraintViolationException("Project " + project + " is not configured.", Set.of());
+			}
+
+			if (context.isDownstreamUserIgnored(event.triggeredByUser)) {
+				Log.infof("Event was triggered by %s user that is in the ignore list.", event.triggeredByUser);
+				return;
+			}
+
+			for (Runnable handler : eventType.handlers(reportingConfig, event, context)) {
+				context.submitDownstreamTask(handler);
+			}
+		}, () -> Log.infof("Event type %s is not supported and cannot be handled.", event.event));
+
+	}
+
 	public void syncLastUpdated(String projectGroup) {
 		try (FailureCollector failureCollector = FailureCollector.collector(reportingConfig)) {
 			Log.infof("Starting scheduled sync of issues for the project group %s", projectGroup);

src/main/java/org/hibernate/infra/replicate/jira/service/jira/handler/action/JiraActionEventHandler.java

@@ -0,0 +1,49 @@
+package org.hibernate.infra.replicate.jira.service.jira.handler.action;
+
+import org.hibernate.infra.replicate.jira.service.jira.HandlerProjectContext;
+import org.hibernate.infra.replicate.jira.service.jira.model.action.JiraActionEvent;
+import org.hibernate.infra.replicate.jira.service.jira.model.rest.JiraIssue;
+import org.hibernate.infra.replicate.jira.service.reporting.FailureCollector;
+import org.hibernate.infra.replicate.jira.service.reporting.ReportingConfig;
+
+import io.quarkus.logging.Log;
+
+public abstract class JiraActionEventHandler implements Runnable {
+
+	protected final JiraActionEvent event;
+	protected final FailureCollector failureCollector;
+	protected final HandlerProjectContext context;
+
+	protected JiraActionEventHandler(ReportingConfig reportingConfig, HandlerProjectContext context,
+			JiraActionEvent event) {
+		this.event = event;
+		this.failureCollector = FailureCollector.collector(reportingConfig);
+		this.context = context;
+	}
+
+	@Override
+	public final void run() {
+		try {
+			context.startProcessingDownstreamEvent();
+			doRun();
+		} catch (RuntimeException e) {
+			failureCollector.critical("Failed to handled the event: %s".formatted(this), e);
+		} catch (InterruptedException e) {
+			failureCollector.critical("Interrupted while waiting in the queue", e);
+			Thread.currentThread().interrupt();
+		} finally {
+			failureCollector.close();
+			Log.infof("Finished processing %s. Pending events in %s to process: %s", this.toString(),
+					context.projectGroupName(), context.pendingDownstreamEventsInCurrentContext());
+		}
+	}
+
+	protected String toSourceKey(String key) {
+		return "%s-%d".formatted(context.project().originalProjectKey(), JiraIssue.keyToLong(key));
+	}
+
+	protected abstract void doRun();
+
+	public abstract String toString();
+
+}

src/main/java/org/hibernate/infra/replicate/jira/service/jira/handler/action/JiraAssigneeActionEventHandler.java

@@ -0,0 +1,41 @@
+package org.hibernate.infra.replicate.jira.service.jira.handler.action;
+
+import org.hibernate.infra.replicate.jira.service.jira.HandlerProjectContext;
+import org.hibernate.infra.replicate.jira.service.jira.model.action.JiraActionEvent;
+import org.hibernate.infra.replicate.jira.service.jira.model.rest.JiraFields;
+import org.hibernate.infra.replicate.jira.service.jira.model.rest.JiraIssue;
+import org.hibernate.infra.replicate.jira.service.jira.model.rest.JiraUser;
+import org.hibernate.infra.replicate.jira.service.reporting.ReportingConfig;
+
+public class JiraAssigneeActionEventHandler extends JiraActionEventHandler {
+
+	public JiraAssigneeActionEventHandler(ReportingConfig reportingConfig, HandlerProjectContext context,
+			JiraActionEvent event) {
+		super(reportingConfig, context, event);
+	}
+
+	@Override
+	protected void doRun() {
+		JiraIssue issue = context.destinationJiraClient().getIssue(event.key);
+
+		JiraIssue updated = new JiraIssue();
+		updated.fields = JiraFields.empty();
+		if (issue.fields.assignee != null) {
+			String accountId = context.upstreamUser(
+					issue.fields.assignee.mappedIdentifier(context.projectGroup().users().mappedPropertyName()));
+
+			if (accountId != null) {
+				updated.fields.assignee = new JiraUser(accountId);
+
+			}
+		} else {
+			updated.fields.assignee = new JiraUser("-1");
+		}
+		context.sourceJiraClient().update(toSourceKey(event.key), updated);
+	}
+
+	@Override
+	public String toString() {
+		return "JiraAssigneeActionEventHandler[" + "event=" + event + ", project=" + context.projectName() + ']';
+	}
+}

src/main/java/org/hibernate/infra/replicate/jira/service/jira/model/action/JiraActionEvent.java

@@ -0,0 +1,26 @@
+package org.hibernate.infra.replicate.jira.service.jira.model.action;
+
+import java.util.Optional;
+
+import org.hibernate.infra.replicate.jira.service.jira.model.JiraBaseObject;
+import org.hibernate.infra.replicate.jira.service.jira.model.hook.JiraActionEventType;
+
+public class JiraActionEvent extends JiraBaseObject {
+	public String id;
+	public String key;
+	public String event;
+	public String assignee;
+	public String status;
+
+	public String triggeredByUser;
+
+	public Optional<JiraActionEventType> eventType() {
+		return JiraActionEventType.of(event);
+	}
+
+	@Override
+	public String toString() {
+		return "JiraActionEvent{" + "id='" + id + '\'' + ", key='" + key + '\'' + ", event='" + event + '\''
+				+ ", assignee='" + assignee + '\'' + ", status='" + status + '\'' + '}';
+	}
+}