hiproxy/src/flows/errorHandler.js

hiproxy - lightweight and powerful proxy tool for front-end developer based on Node.js.

/**
 * @file Initialize work flow error handler
 * @author zdying
 */

var fs = require('fs');
var path = require('path');
var dirTool = require('../helpers/dirTool');

/* istanbul ignore next */
module.exports = function (err, ctx) {
  var server = this;
  var options = server.options;
  var onError = options.onError;
  var errDetail = getErrorDetail(err);
  var tmpDir = dirTool.getTmpDir();
  var fileName = (new Date()).toISOString() + '_' + Math.ceil(Math.random() * 1000) + '.log';
  var filePath = path.join(tmpDir, fileName.replace(/[:-]/g, '_'));
  var res = ctx.res;

  if (onError.length > 0) {
    onError.forEach(function (fn) {
      fn.call(server, err, ctx);
    });
  }

  var messages = [
    '\n****************** ' + 'hiproxy Error'.red + ' ******************\n',
    'Error: ' + (err.message || '').red.underline,
    '',
    'If you need help, you may report this error at:',
    '  ' + 'https://github.com/hiproxy/hiproxy/issues/new'.cyan.underline,
    ''
  ];
  var detail = '';

  fs.writeFile(filePath, errDetail, function (error) {
    if (!error) {
      messages.push(
        'Please include the following file with any support request:'
      );
      detail = filePath.cyan.underline;
    } else {
      messages.push(
        'Please include the following detail with any support request:'
      );
      detail = errDetail;
    }

    // TODO add documentation
    if (options.errorTips !== false) {
      console.log(messages.join('\n'));
      console.log('  ' + detail);
      console.log('');
    }

    if (!res) {
      // only exit the process when it's initialize flow.
      // hiproxy has two work flow: initialize and proxy.
      // only the proxy flow's context has the `res` property.
      process.exit();
    } else {
      // TODO update error page
      res.end(
        '<pre>' + messages.concat('  ' + detail).join('\n').replace(/\[\d+m/g, '') + '</pre>'
      );
    }
  });
};

function getErrorDetail (err) {
  var msg = [];
  var pkg = require('../../package.json');

  msg.push('hiproxy ' + pkg.version);
  msg.push('argv: ' + process.argv.slice(2).join(' '));

  msg.push('error message: ' + err.message);
  msg.push('error stack: ' + err.stack);
  msg.push('');

  return msg.join('\n');
}