bottender-compose/lib/logger.js

An utility library for bottender and higher-order handlers

"use strict";

const {
  isValidTemplate,
  compileTemplate
} = require('./utils');

function createLoggerAction(fn, name) {
  return (...args) => {
    const Action = (context, props) => fn(...args.map(arg => {
      if (typeof arg === 'function') {
        return arg(context, props);
      }

      if (typeof arg === 'string' && isValidTemplate(arg)) {
        return compileTemplate(arg)(context);
      }

      return arg;
    }));

    const firstArg = args[0];
    const actionName = firstArg && typeof firstArg === 'string' ? `${name}(${firstArg.length > 15 ? `${firstArg.slice(0, 15)}...` : args})` : name;
    Object.defineProperty(Action, 'name', {
      value: actionName
    });
    return Action;
  };
}

function createLogger(adapter) {
  return {
    log: createLoggerAction(adapter.log, 'Log'),
    info: createLoggerAction(adapter.info, 'Info'),
    warn: createLoggerAction(adapter.warn, 'Warn'),
    error: createLoggerAction(adapter.error, 'Error')
  };
}

const {
  log,
  info,
  warn,
  error
} = createLogger(console);
exports.log = log;
exports.info = info;
exports.warn = warn;
exports.error = error;
exports.createLogger = createLogger;