briareus/lib/utilities.js

Briareus assists with Feature Branch deploys to ECS

'use strict'

const crypto = require('crypto');
const fs = require('fs');

const async = require('async');

const taskDefinitionValidator = require('./taskDefinitionValidator');

let utilities = module.exports = {
  awsRetry(fn, cb) {
    let params = {
      times: 10,
      interval: function (retryCount) {
        return 100 * Math.pow(2, retryCount);
      }
    };

    async.retry(params, fn, cb);
  },

  hashSlug(slug) {
    return crypto.createHash('md5').update(slug).digest("hex").substr(0, 22);
  },

  getProjectBriareusDir(projectRootDir) {
    return `${projectRootDir}/.briareus`;
  },

  getProjectConfigPath(projectRootDir) {
    return `${utilities.getProjectBriareusDir(projectRootDir)}/config.json`;
  },

  getProjectTaskDefinitionPath(projectRootDir) {
    return `${utilities.getProjectBriareusDir(projectRootDir)}/task-definition.json`;
  },

  getProjectConfigRaw(projectRootDir) {
    let projectBriareusConfig = `${utilities.getProjectConfigPath(projectRootDir)}`;

    if (!fs.existsSync(projectBriareusConfig)) {
      throw new Error(`config.json file not found in .briareus directory`);
    }

    try { var config = JSON.parse(fs.readFileSync(projectBriareusConfig)); }
    catch (e) {
      throw new Error(`Error parsing json at ${projectBriareusConfig}. ${e.message}`);
    }

    return config;
  },

  packageBriareusConfig(projectRootDir) {
    let projectTaskDefinition = `${utilities.getProjectTaskDefinitionPath(projectRootDir)}`;
    let config = utilities.getProjectConfigRaw(projectRootDir);

    if (!fs.existsSync(projectTaskDefinition)) {
      throw new Error(`task-definition.json file not found in .briareus directory`);
    }

    try { var taskDefinition = JSON.parse(fs.readFileSync(projectTaskDefinition, 'utf8')); }
    catch (e) {
      throw new Error(`Error parsing json at ${projectTaskDefinition}. ${e.message}`);
    }

    let result = taskDefinitionValidator(taskDefinition);
    if (result) throw result;

    config.taskDefinition = taskDefinition;

    return config;
  }
}