180 lines
3.2 KiB
JavaScript
180 lines
3.2 KiB
JavaScript
/**
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* Action.
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*/
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var EventEmitter = require('events').EventEmitter;
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var util = require('util');
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/**
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* Constructor.
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*/
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function Action(name) {
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logger.debug('new Action');
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EventEmitter.call(this);
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//
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// ATTRIBUTES
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//
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this.name = name;
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//
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// INIT
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//
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};
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// injerits EventEmitter
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Action.prototype = Object.create(EventEmitter.prototype, {
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//
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// FUNCTIONS
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//
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/**
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* @return action needs request body data.
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*/
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withReqData: {
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value: function() {
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return false;
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},
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enumerable: true,
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configurable: true,
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writable: true
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},
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/**
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* Listen request data event.
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*/
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reqData: {
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value: function(chunk) {
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//TODO
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},
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enumerable: true,
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configurable: true,
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writable: true
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},
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/**
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* Prepare action.
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* @param callback (err, statusCode, headers)
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*/
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prepare: {
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value: function(callback) {
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logger.debug('prepare Action');
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// TODO impl per action type
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// default: OK, no headers
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callback(null, 200, {});
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},
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enumerable: true,
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configurable: true,
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writable: true
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},
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doAction: {
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value: function(){
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logger.debug('doAction');
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//TODO emit data end events
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this.emit('end');
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},
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enumerable: true,
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configurable: true,
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writable: true
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}
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});
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/**
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* Action show single resource.
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*/
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function ShowAction() {
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logger.debug('new ShowAction');
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Action.call(this, 'show');
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};
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// inherits Action
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ShowAction.prototype = Object.create(Action.prototype, {
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/**
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* Resource id.
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*/
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resId: { value: null, enumerable: true, configurable: true, writable: true },
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/**
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* Resource.
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*/
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res: { value: null, enumerable: true, configurable: true, writable: true },
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/**
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* Prepare show action.
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* Headers:
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* - Link: related resource.
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*/
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prepare: {
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value: function(callback) {
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var self = this;
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if (this.resId) {
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this.loadResource(this.resId, function(err, res) {
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self.res = res;
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logger.debug('resource loaded: ' + res);
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//TODO err
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var link = '';
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var rels = self.getRelated(res); // { type: 'author', path: '/author/id'}
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logger.debug(rels);
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rels.forEach(function (e) {
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if (link.length > 0) link+=', ';
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link += '<' + config.urlPrefix + e.path + '>; rel=' + e.type;
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});
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var headers = {};
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if (link.length > 0) {
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headers.Link = link;
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}
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callback(null, 200, headers);
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});
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} else {
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//TODO error?
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callback(null, '5OO', {});
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}
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},
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enumerable: true,
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configurable: true,
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writable: true
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},
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/**
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* Load resource.
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* @param resource id
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* @param callback <function(err, resource)>
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*/
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loadResource: {
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value: function(resId, callback){
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//implement
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callback(new Error('Cannot load resource ' + resId));
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},
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enumerable: true,
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configurable: true,
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writable: true
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},
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/**
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* Get related resources.
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* @param res resource
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* @return related resources { type: 'author', path: '/author/id'}
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*/
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getRelated: {
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value: function(res){
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return [];
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},
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enumerable: true,
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configurable: true,
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writable: true
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},
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doAction: {
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value: function(){
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logger.debug('doAction');
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this.emit('data', this.res);
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this.emit('end');
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},
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enumerable: true,
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configurable: true,
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writable: true
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}
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});
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module.exports = {
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ShowAction: ShowAction
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};
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