Add a dedicated GQL server for metadata available on /meta (#1820)

server/src/metadata/data-source-metadata/data-source-metadata.entity.ts

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+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  PrimaryGeneratedColumn,
+  UpdateDateColumn,
+  DataSourceOptions,
+} from 'typeorm';
+
+type DataSourceType = DataSourceOptions['type'];
+
+@Entity('data_source_metadata')
+export class DataSourceMetadata {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ nullable: true })
+  url: string;
+
+  @Column({ nullable: true })
+  schema: string;
+
+  @Column({ type: 'enum', enum: ['postgres'], default: 'postgres' })
+  type: DataSourceType;
+
+  @Column({ nullable: true, name: 'display_name' })
+  displayName: string;
+
+  @Column({ default: false, name: 'is_remote' })
+  isRemote: boolean;
+
+  @Column({ nullable: false, name: 'workspace_id' })
+  workspaceId: string;
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at' })
+  updatedAt: Date;
+}

server/src/metadata/data-source-metadata/data-source-metadata.module.ts

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+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+
+import { DataSourceMetadataService } from './data-source-metadata.service';
+import { DataSourceMetadata } from './data-source-metadata.entity';
+
+@Module({
+  imports: [TypeOrmModule.forFeature([DataSourceMetadata], 'metadata')],
+  providers: [DataSourceMetadataService],
+  exports: [DataSourceMetadataService],
+})
+export class DataSourceMetadataModule {}

server/src/metadata/data-source-metadata/data-source-metadata.service.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { getRepositoryToken } from '@nestjs/typeorm';
+
+import { DataSourceMetadataService } from './data-source-metadata.service';
+import { DataSourceMetadata } from './data-source-metadata.entity';
+
+describe('DataSourceMetadataService', () => {
+  let service: DataSourceMetadataService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [
+        DataSourceMetadataService,
+        {
+          provide: getRepositoryToken(DataSourceMetadata, 'metadata'),
+          useValue: {},
+        },
+      ],
+    }).compile();
+
+    service = module.get<DataSourceMetadataService>(DataSourceMetadataService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

server/src/metadata/data-source-metadata/data-source-metadata.service.ts

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+import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+
+import { Repository } from 'typeorm';
+
+import { DataSourceMetadata } from './data-source-metadata.entity';
+
+@Injectable()
+export class DataSourceMetadataService {
+  constructor(
+    @InjectRepository(DataSourceMetadata, 'metadata')
+    private readonly dataSourceMetadataRepository: Repository<DataSourceMetadata>,
+  ) {}
+
+  async createDataSourceMetadata(workspaceId: string, workspaceSchema: string) {
+    // TODO: Double check if this is the correct way to do this
+    const dataSource = await this.dataSourceMetadataRepository.findOne({
+      where: { workspaceId },
+    });
+
+    if (dataSource) {
+      return dataSource;
+    }
+
+    return this.dataSourceMetadataRepository.save({
+      workspaceId,
+      schema: workspaceSchema,
+    });
+  }
+
+  async getDataSourcesMetadataFromWorkspaceId(workspaceId: string) {
+    return this.dataSourceMetadataRepository.find({
+      where: { workspaceId },
+      order: { createdAt: 'DESC' },
+    });
+  }
+
+  async getLastDataSourceMetadataFromWorkspaceIdOrFail(workspaceId: string) {
+    return this.dataSourceMetadataRepository.findOneOrFail({
+      where: { workspaceId },
+      order: { createdAt: 'DESC' },
+    });
+  }
+}