Add database configuration store

CODEOWNERS

@@ -1,3 +1,4 @@
 **/* @github/codeql-vscode-reviewers
 **/remote-queries/ @github/code-scanning-secexp-reviewers
 **/variant-analysis/ @github/code-scanning-secexp-reviewers
+**/databases/ @github/code-scanning-secexp-reviewers

extensions/ql-vscode/src/databases/README.md

@@ -0,0 +1,3 @@
+### Databases
+
+This folder contains code for the new experimental databases panel and new query run experience.

extensions/ql-vscode/src/databases/db-config-store.ts

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+import * as fs from 'fs-extra';
+import * as path from 'path';
+import { cloneDbConfig, DbConfig } from './db-config';
+
+export class DbConfigStore {
+  private readonly configPath: string;
+
+  private config: DbConfig;
+
+  public constructor(workspaceStoragePath: string) {
+    this.configPath = path.join(workspaceStoragePath, 'dbconfig.json');
+
+    this.config = this.createEmptyConfig();
+  }
+
+  public async initialize(): Promise<void> {
+    await this.loadConfig();
+  }
+
+  public getConfig(): DbConfig {
+    // Clone the config so that it's not modified outside of this class.
+    return cloneDbConfig(this.config);
+  }
+
+  private async loadConfig(): Promise<void> {
+    if (!await fs.pathExists(this.configPath)) {
+      await fs.writeJSON(this.configPath, this.createEmptyConfig(), { spaces: 2 });
+    }
+
+    await this.readConfig();
+  }
+
+  private async readConfig(): Promise<void> {
+    this.config = await fs.readJSON(this.configPath);
+  }
+
+  private createEmptyConfig(): DbConfig {
+    return {
+      remote: {
+        repositoryLists: [],
+        owners: [],
+        repositories: [],
+      }
+    };
+  }
+}

extensions/ql-vscode/src/databases/db-config.ts

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+// Contains models for the data we want to store in the database config
+
+export interface DbConfig {
+  remote: RemoteDbConfig;
+}
+
+export interface RemoteDbConfig {
+  repositoryLists: RemoteRepositoryList[];
+  owners: string[];
+  repositories: string[];
+}
+
+export interface RemoteRepositoryList {
+  name: string;
+  repositories: string[];
+}
+
+export function cloneDbConfig(config: DbConfig): DbConfig {
+  return {
+    remote: {
+      repositoryLists: config.remote.repositoryLists.map((list) => ({
+        name: list.name,
+        repositories: [...list.repositories],
+      })),
+      owners: [...config.remote.owners],
+      repositories: [...config.remote.repositories],
+    }
+  };
+}

extensions/ql-vscode/test/pure-tests/databases/data/dbconfig.json

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+{
+  "remote": {
+    "repositoryLists": [
+      {
+        "name": "repoList1",
+        "repositories": ["foo/bar", "foo/baz"]
+      }
+    ],
+    "owners": [],
+    "repositories": ["owner/repo1", "owner/repo2", "owner/repo3"]
+  }
+}

extensions/ql-vscode/test/pure-tests/databases/db-config-store.test.ts

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+import * as fs from 'fs-extra';
+import * as path from 'path';
+import { DbConfigStore } from '../../../src/databases/db-config-store';
+import { expect } from 'chai';
+
+
+describe('db config store', async () => {
+  const workspaceStoragePath = path.join(__dirname, 'test-workspace');
+  const testStoragePath = path.join(__dirname, 'data');
+
+  beforeEach(async () => {
+    await fs.ensureDir(workspaceStoragePath);
+  });
+
+  afterEach(async () => {
+    await fs.remove(workspaceStoragePath);
+  });
+
+  it('should create a new config if one does not exist', async () => {
+    const configPath = path.join(workspaceStoragePath, 'dbconfig.json');
+
+    const configStore = new DbConfigStore(workspaceStoragePath);
+    await configStore.initialize();
+
+    expect(await fs.pathExists(configPath)).to.be.true;
+    const config = configStore.getConfig();
+    expect(config.remote.repositoryLists).to.be.empty;
+    expect(config.remote.owners).to.be.empty;
+    expect(config.remote.repositories).to.be.empty;
+  });
+
+  it('should load an existing config', async () => {
+    const configStore = new DbConfigStore(testStoragePath);
+    await configStore.initialize();
+
+    const config = configStore.getConfig();
+    expect(config.remote.repositoryLists).to.have.length(1);
+    expect(config.remote.repositoryLists[0]).to.deep.equal({
+      'name': 'repoList1',
+      'repositories': ['foo/bar', 'foo/baz']
+    });
+    expect(config.remote.owners).to.be.empty;
+    expect(config.remote.repositories).to.have.length(3);
+    expect(config.remote.repositories).to.deep.equal(['owner/repo1', 'owner/repo2', 'owner/repo3']);
+  });
+
+  it('should not allow modification of the config', async () => {
+    const configStore = new DbConfigStore(testStoragePath);
+    await configStore.initialize();
+
+    const config = configStore.getConfig();
+    config.remote.repositoryLists = [];
+
+    const reRetrievedConfig = configStore.getConfig();
+    expect(reRetrievedConfig.remote.repositoryLists).to.have.length(1);
+  });
+});