now-cli/lib/alias.js

import retry from 'async-retry';
import Now from '../lib';

export default class Alias extends Now {
  async ls () {
    return retry(async (bail) => {
      const res = await this._fetch('/now/aliases');

      if (200 !== res.status && (400 <= res.status || 500 > res.status)) {
        if (this._debug) console.log('> [debug] bailing on creating due to %s', res.status);
        return bail(responseError(res));
      }

      return await res.json();
    }, { retries: 3, minTimeout: 2500, onRetry: this._onRetry });
  }

  async rm (url, aliases) {
    console.log('rm', url, aliases);
    const deploymentId = url; // TODO get from API
    return await Promise.all(aliases.map(async (alias) => {
      retry(async (bail) => {
        const res = await this._fetch(`/now/aliases/${deploymentId}/${alias}`, {
          method: 'DELETE'
        });

        if (200 !== res.status && (400 <= res.status || 500 > res.status)) {
          if (this._debug) console.log('> [debug] bailing on creating due to %s', res.status);
          return bail(responseError(res));
        }

        return await res.json();
      }, { retries: 3, minTimeout: 2500, onRetry: this._onRetry });
    }));
  }

  async set (url, aliases) {
    console.log('set', url, aliases);
    const deploymentId = url; // TODO get from API
    return retry(async (bail) => {
      const res = await this._fetch(`/now/aliases/${deploymentId}/`, {
        method: 'POST',
        body: {
          aliases: aliases
        }
      });

      if (200 !== res.status && (400 <= res.status || 500 > res.status)) {
        if (this._debug) console.log('> [debug] bailing on creating due to %s', res.status);
        return bail(responseError(res));
      }

      return await res.json();
    }, { retries: 3, minTimeout: 2500, onRetry: this._onRetry });
  }
}

function responseError (res) {
  const err = new Error('Response error');
  err.status = res.status;

  if (429 === res.status) {
    const retryAfter = res.headers.get('Retry-After');
    if (retryAfter) {
      err.retryAfter = parseInt(retryAfter, 10);
    }
  }

  return err;
}