use dockerode to get container ip address

docker-ip.js

const Docker = require('dockerode');
const fs = require('fs');

const socket = process.env.DOCKER_SOCKET || '/var/run/docker.sock';
const stats = fs.statSync(socket);

if (!stats.isSocket()) {
  throw new Error('Are you sure the docker is running?');
}

const docker = new Docker({ socketPath: socket });

module.exports.getFrontendIP = function() {
  return new Promise((resolve, reject) => {
    docker.listContainers({}, (err, containers) => {
      if (err) reject(err);

      const container = containers.find(
        node => node.Image === 'toolchain-web_frontend',
      );
      resolve(
        container.NetworkSettings.Networks['toolchain-web_default'].IPAddress,
      );
    });
  });
};