first commit

libs/api/tracker/presenters/src/lib/graphql/subscription.resolver.ts

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+import { Args, ID, Resolver, Subscription } from '@nestjs/graphql';
+import { User } from '@task-stream/api/identity/domain';
+import { CurrentUser } from '@task-stream/api/identity/presenters';
+import { ChangesService } from '@task-stream/api/tracker/application';
+import {
+  ActivityGql,
+  CommentChangeGql,
+  IssueChangeGql,
+  ProjectChangeGql,
+  ReleaseChangeGql,
+} from './types';
+
+const asIs = { resolve: <T>(payload: T) => payload };
+
+/**
+ * Realtime API (graphql-ws). Events are emitted after the read model is
+ * updated, so a client can refetch and always see the new state.
+ */
+@Resolver()
+export class SubscriptionResolver {
+  constructor(private readonly changes: ChangesService) {}
+
+  @Subscription(() => IssueChangeGql, {
+    ...asIs,
+    description:
+      'Tickets created/updated/moved in a project (board in realtime)',
+  })
+  issueChanged(
+    @CurrentUser() me: User,
+    @Args('projectId', { type: () => ID }) projectId: string,
+  ) {
+    return this.changes.watchIssues(me.id, projectId);
+  }
+
+  @Subscription(() => CommentChangeGql, asIs)
+  commentChanged(
+    @CurrentUser() me: User,
+    @Args('issueId', { type: () => ID }) issueId: string,
+  ) {
+    return this.changes.watchComments(me.id, issueId);
+  }
+
+  @Subscription(() => ActivityGql, {
+    ...asIs,
+    description: 'Live activity feed',
+  })
+  activityAdded(
+    @CurrentUser() me: User,
+    @Args('projectId', { type: () => ID }) projectId: string,
+  ) {
+    return this.changes.watchActivity(me.id, projectId);
+  }
+
+  @Subscription(() => ReleaseChangeGql, asIs)
+  releaseChanged(
+    @CurrentUser() me: User,
+    @Args('projectId', { type: () => ID }) projectId: string,
+  ) {
+    return this.changes.watchReleases(me.id, projectId);
+  }
+
+  @Subscription(() => ProjectChangeGql, asIs)
+  projectChanged(
+    @CurrentUser() me: User,
+    @Args('projectId', { type: () => ID }) projectId: string,
+  ) {
+    return this.changes.watchProject(me.id, projectId);
+  }
+
+  @Subscription(() => ProjectChangeGql, {
+    ...asIs,
+    description: 'Projects I am added to / removed from',
+  })
+  myProjectsChanged(@CurrentUser() me: User) {
+    return this.changes.watchMyProjects(me.id);
+  }
+}