asksuite-core/util/MetaDialogCaller.js

const _ = require('lodash');

const AWSLambdaCaller = require('../services/AWSLambdaCaller');
const CodeSnippetsAccessor = require('../services/CodeSnippetsAccessor');
const CodeSnippetsCache = require('../singletons/CodeSnippetsCache');

const LAMBDA_NAME = 'asksuite-lambda-function-dev-executor';
const DEFAULT_MEMORY_SIZE = 1024;

module.exports = class MetaDialogCaller {
  constructor(snippetId, parameters, resources, config) {
    this.snippetId = snippetId;

    // Parses if it comes as an array
    this.parameters = this.parseParameters(parameters);

    this.resources = resources;

    this.config = config;

    this.accessor = new CodeSnippetsAccessor(this.config);
  }

  parseParameters(parameters) {
    if (Array.isArray(parameters)) {
      return _.chain(parameters)
        .keyBy('id')
        .mapValues('value')
        .value();
    }
    return parameters;
  }

  async mountLambdaRequest() {
    let snippet;
    try {
      const res = await this.accessor.find(this.snippetId);
      snippet = res.toJSON().body;
    } catch (e) {
      // Control off
      snippet = CodeSnippetsCache.get(this.snippetId);
    }

    if (!snippet) {
      throw new Error('Snippet not found');
    } else if (typeof snippet === 'string') {
      snippet = JSON.parse(snippet);
    }

    CodeSnippetsCache.set(snippet.id, snippet);

    const selectedResources = _.pick(this.resources, snippet.resources);
    const mergedParameters = _.assign(this.parseParameters(snippet.parameters), this.parameters);
    const parameters = _.assign(mergedParameters, selectedResources);

    return {
      parameters,
      functionCode: snippet.snippet,
      memorySize: snippet.memorySize,
    };
  }

  mountLambdaName(memorySize) {
    return `${LAMBDA_NAME}_${memorySize}`;
  }

  async call() {
    const awsLambdaCaller = new AWSLambdaCaller(this.config.CORE_LAMBDA_AWS);

    const requestObj = await this.mountLambdaRequest();

    return awsLambdaCaller.call(
      requestObj,
      this.mountLambdaName(requestObj.memorySize || DEFAULT_MEMORY_SIZE),
    );
  }
};