entry.ts

import { Logger as MatrixLogger } from 'matrix-appservice-bridge';
import yargs from 'yargs/yargs';

import ConfigReader from './src/configuration/ConfigReader';
import DatabaseConfiguration from './src/configuration/DatabaseConfiguration';
import Database from './src/repositories/Database';
import startup from './src/startup';
import logger, { configureLogger, logExt } from './src/util/logger';
import parseBoolean from './src/util/parseBoolean';

const parseArgs = async () => {
  const { argv } = await yargs(process.argv.slice(2))
    .version(false)
    .strict(true)
    .demandCommand(0, 0)
    .usage('$0 [options]')
    .option('config', {
      alias: 'c',
      type: 'string',
      nargs: 1,
      describe: 'Path to the configuration file.',
      default: () => process.env.WEBHOOK_CONFIG ?? './gateway-config.yaml',
      defaultDescription: './gateway-config.yaml',
    })
    .option('appservice-config', {
      alias: 'a',
      type: 'string',
      nargs: 1,
      describe: 'Where the generated appservice.yaml should be placed.',
      default: () =>
        process.env.WEBHOOK_APPSERVICE_CONFIG ?? './appservice.yaml',
      defaultDescription: './appservice.yaml',
    })
    .boolean('clear-plugin-cache')
    .default('clear-plugin-cache', false)
    .describe(
      'clear-plugin-cache',
      'Clear the plugin cache before compiling plugins.',
    )
    .option('migrate', {
      type: 'number',
      description:
        'Apply the specified number of migrations. To migrate up, supply a ' +
        'positive number. To migrate down, supply a negative number. ' +
        'Implies --no-auto-migrate.',
      nargs: 1,
    })
    .option('migrate-status', {
      type: 'boolean',
      description: 'Print the migration status, then exit.',
    })
    .option('auto-migrate', {
      default: () => parseBoolean(process.env.WEBHOOK_AUTO_MIGRATE) ?? true,
      hidden: true,
    })
    .describe(
      'no-auto-migrate',
      'Do not perform automatic migrations. This will cause the application to ' +
        'exit with a non-zero exit code if there are pending migrations.',
    )
    .count('v')
    .alias('v', 'verbose')
    .describe('v', 'Log verbosity, repeat multiple times to raise.')
    .help('h')
    .alias('h', 'help')
    .check((a) => {
      if (a.migrate !== undefined && Number.isNaN(a.migrate)) {
        throw new Error('Invalid number of migrations supplied.');
      }
      return true;
    });

  return argv;
};

const initialiseLogging = (verbose: number) => {
  configureLogger(verbose);

  MatrixLogger.configure({
    console: 'error',
    maxFiles: 1,
  });

  process.on('unhandledRejection', (error) => {
    logger.error('Unhandled error:', (error as Error).message);
    logger.prettyError(error as Error);
    logger.fatal('Unhandled promise rejection, application will now exit');
    process.exit(1);
  });
};

const migrateAndQuit = async (
  databaseConfig: DatabaseConfiguration,
  migrations: number,
) => {
  const database = new Database(databaseConfig);
  try {
    await database.migrateBy(migrations);
  } catch (error) {
    logExt.tryLogMessage(error);
    logger.fatal(
      'Encountered an error performing migrations, application will now exit',
    );
    process.exit(1);
  }
  logger.info('Migration successful, application will now exit');
  process.exit(0);
};

const printMigrationStatus = async (databaseConfig: DatabaseConfiguration) => {
  const database = new Database(databaseConfig);
  const migrations = await database.getMigrationStatus();
  if (migrations.completed.length === 1) {
    logger.info('There is one completed migration');
  } else {
    logger.info(
      `There are ${migrations.completed.length} completed migrations`,
    );
  }
  for (const migration of migrations.completed) {
    logger.info(` - ${migration}`);
  }

  if (migrations.pending.length === 1) {
    logger.info('There is one pending migration');
  } else {
    logger.info(`There are ${migrations.pending.length} pending migrations`);
  }
  for (const migration of migrations.pending) {
    logger.info(` - ${migration.typescriptFileName}`);
  }
  process.exit(1);
};

const entry = async () => {
  const argv = await parseArgs();

  initialiseLogging(argv.verbose);

  const config = ConfigReader.loadConfig(
    // This is a quirk in the type annotations for yargs, it incorrectly determines
    // the type of configuration keys as functions if they have a function as
    // default value generator, even though yargs has already evaluated those
    // generators for us.
    argv.config as unknown as string,
    argv['appservice-config'] as unknown as string,
  );
  if (typeof config === 'undefined') {
    logger.fatal(
      'Could not load configuration file, application will now exit',
    );
    process.exit(1);
  }

  if (argv['migrate-status']) {
    await printMigrationStatus(config.database);
  } else if (argv.migrate) {
    await migrateAndQuit(config.database, argv.migrate);
  } else {
    await startup(
      argv['clear-plugin-cache'],
      argv['auto-migrate'] as unknown as boolean,
      config,
    );
  }
};

entry().catch((error) => {
  logger.prettyError(error);
  logger.fatal(
    'Encountered an error during startup, application will now exit',
  );
  process.exit(1);
});