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Sample.ts
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Sample.ts
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import { Logger, UseGuards } from '@nestjs/common';
import { Args, Mutation, Resolver, Subscription } from '@nestjs/graphql';
import { PubSub } from 'graphql-subscriptions';
import gql from 'graphql-tag';
import { GraphQLUpload } from 'graphql-upload';
import { interval } from 'rxjs';
import { GqlGuard, GqlUser, RequestUser, Roles } from '../../auth';
import type { FileInfo } from '../models';
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');
}
}