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ZenSoftware avatar ZenSoftware commented on May 18, 2024
  • Implemented client side GraphQL Subscription over WebSockets
  • Implemented server side sample of a pub/sub Nest GraphQL Subscription service
  • Works with the @Roles(roles: string | string[]) authorization to be used in conjunction with the JWT @UseGuards(GqlGuard) decorator.

zen/libs/main/src/lib/zen-portal/zen-super/zen-sample-subscription/zen-sample-subscription.component.ts

Lines 22 to 26 in 1019403

constructor(private sampleSubscriptionGQL: SampleSubscriptionGQL) {
this.#sub = this.sampleSubscriptionGQL.subscribe().subscribe(({ data }) => {
this.recentValue = data?.sampleSubscription.message;
});
}

zen/apps/api/src/app/graphql/resolvers/Sample.ts

Lines 11 to 56 in 1019403

export const typeDefs = gql`
extend type Mutation {
sampleUpload(file: Upload!): Boolean!
}
type SampleSubscriptionResult {
message: String!
}
type Subscription {
sampleSubscription: SampleSubscriptionResult!
}
`;
const pubSub = new PubSub();
interval(1000).subscribe(i =>
pubSub.publish('sampleSubscription', {
sampleSubscription: {
message: `Server ticker ${i}`,
},
})
);
@Resolver()
@UseGuards(GqlGuard)
@Roles('Super')
export class SampleResolver {
@Mutation()
async sampleUpload(@Args('file', { type: () => GraphQLUpload }) file: FileInfo) {
const readStream = file.file.createReadStream();
const chunks = [];
for await (const chunk of readStream) {
chunks.push(chunk);
}
const buffer = Buffer.concat(chunks);
Logger.log(`Recieved '${file.file.filename}' ${buffer.byteLength} bytes`);
return true;
}
@Subscription()
async sampleSubscription(@GqlUser() user: RequestUser) {
Logger.log(`sampleSubscription subscribed to by user with id ${user.id}`);
return pubSub.asyncIterator('sampleSubscription');
}
}

from zen.

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