traverson/lib/transforms/fetch_last_resource.js

Hypermedia API/HATEOAS client for Node.js and the browser

'use strict';

// TODO Only difference to lib/transform/fetch_resource is the continuation
// checking, which is missing here. Maybe we can delete this transform and use
// fetch_resource in its place everywhere?

var minilog = require('minilog')
  , log = minilog('traverson')
  , abortTraversal = require('../abort_traversal')
  , httpRequests = require('../http_requests');

/*
 * Execute the last step in a traversal that ends with an HTTP GET.
 */
// This is similar to lib/transforms/fetch_resource.js - refactoring potential?
function fetchLastResource(t, callback) {
  // always check for aborted before doing an HTTP request
  if (t.aborted) {
    return abortTraversal.callCallbackOnAbort(t);
  }
  httpRequests.fetchResource(t, function(err, t) {
    log.debug('fetchResource returned (fetchLastResource).');
    if (err) {
      if (!err.aborted) {
        log.debug('error while executing http request');
        log.error(err);
      }
      return t.callback(err);
    }
    callback(t);
  });
}

fetchLastResource.isAsync = true;

module.exports = fetchLastResource;