mirror of
https://github.com/balena-os/balena-supervisor.git
synced 2024-12-22 06:57:49 +00:00
48e0733c7e
The supervisor uses the following pattern for async module
initialization
```typescript
// module.ts
export const initialised = (async () => {
// do some async initialization
})();
// somewhere else
import * as module from 'module';
async function setup() {
await module.initialise;
}
```
The above pattern means that whenever the module is imported, the
initialisation procedure will be ran, which is an anti-pattern.
This converts any instance of this pattern into a function
```typescript
export const initialised = _.once(async () => {
// do some async initialization
});
```
And anywhere else on the code it replaces the call with a
```typescript
await module.initialised();
```
Change-type: patch
85 lines
2.4 KiB
TypeScript
85 lines
2.4 KiB
TypeScript
import * as constants from '~/lib/constants';
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import * as db from '~/src/db';
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import * as sinon from 'sinon';
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// Creates a test database and returns a query builder
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export async function createDB() {
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const oldDatabasePath = process.env.DATABASE_PATH;
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// for testing we use an in memory database
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process.env.DATABASE_PATH = ':memory:';
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// @ts-ignore
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constants.databasePath = process.env.DATABASE_PATH;
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// Cleanup the module cache in order to have it reloaded in the local context
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delete require.cache[require.resolve('~/src/db')];
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// Initialize the database module
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await db.initialized();
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// Get the knex instance to allow queries to the db
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const { models, upsertModel } = db;
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// This is hacky but haven't found another way to do it,
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// stubbing the db methods here ensures the module under test
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// is using the database we want
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sinon.stub(db, 'models').callsFake(models);
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sinon.stub(db, 'upsertModel').callsFake(upsertModel);
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return {
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// Returns a query builder instance for the given
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// table in order perform data operations
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models,
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// Resets the database to initial value post
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// migrations
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async reset() {
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// Reset the contents of the db
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await db.transaction(async (trx: any) => {
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const result = await trx.raw(`
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SELECT name, sql
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FROM sqlite_master
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WHERE type='table'`);
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for (const r of result) {
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// We don't run the migrations again
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if (r.name !== 'knex_migrations') {
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await trx.raw(`DELETE FROM ${r.name}`);
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}
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}
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// The supervisor expects this value to already have
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// been pre-populated
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await trx('deviceConfig').insert({ targetValues: '{}' });
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});
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// Reset stub call history
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(db.models as sinon.SinonStub).resetHistory();
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(db.upsertModel as sinon.SinonStub).resetHistory();
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},
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// Destroys the in-memory database and resets environment
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async destroy() {
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// Remove data from the in memory database just in case
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this.reset();
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// Restore the old datbase path
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process.env.DATABASE_PATH = oldDatabasePath;
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// Restore stubs
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(db.models as sinon.SinonStub).restore();
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(db.upsertModel as sinon.SinonStub).restore();
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// Restore the constants
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// @ts-ignore
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constants.databasePath = process.env.DATABASE_PATH;
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// Cleanup the module cache in order to have it reloaded
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// correctly next time it's used
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delete require.cache[require.resolve('~/src/db')];
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},
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};
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}
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export type TestDatabase = UnwrappedPromise<ReturnType<typeof createDB>>;
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