361 lines
8.1 KiB
JavaScript
361 lines
8.1 KiB
JavaScript
/**
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* Module dependencies.
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*/
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var DataSource = require('loopback-datasource-juggler').DataSource
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, ModelBuilder = require('loopback-datasource-juggler').ModelBuilder
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, assert = require('assert')
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, fs = require('fs')
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, RemoteObjects = require('strong-remoting')
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, swagger = require('strong-remoting/ext/swagger')
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, stringUtils = require('underscore.string')
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, path = require('path');
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/**
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* Export the app prototype.
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*/
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var app = exports = module.exports = {};
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/**
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* Create a set of remote objects.
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*/
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app.remotes = function () {
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if(this._remotes) {
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return this._remotes;
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} else {
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return (this._remotes = RemoteObjects.create());
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}
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}
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/**
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* Remove a route by reference.
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*/
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app.disuse = function (route) {
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if(this.stack) {
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for (var i = 0; i < this.stack.length; i++) {
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if(this.stack[i].route === route) {
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this.stack.splice(i, 1);
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}
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}
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}
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}
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/**
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* App models.
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*/
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app._models = [];
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/**
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* Expose a model.
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*
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* @param Model {Model}
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*/
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app.model = function (Model, config) {
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if(arguments.length === 1) {
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assert(typeof Model === 'function', 'app.model(Model) => Model must be a function / constructor');
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assert(Model.pluralModelName, 'Model must have a "pluralModelName" property');
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this.remotes().exports[Model.pluralModelName] = Model;
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this._models.push(Model);
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Model.shared = true;
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Model.app = this;
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Model.emit('attached', this);
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return;
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}
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var modelName = Model;
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assert(typeof modelName === 'string', 'app.model(name, config) => "name" name must be a string');
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Model =
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this.models[modelName] =
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this.models[classify(modelName)] =
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this.models[camelize(modelName)] = modelFromConfig(modelName, config, this);
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this.model(Model);
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return Model;
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}
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/**
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* Get a Model by name.
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*/
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app.getModel = function (modelName) {
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this.models
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};
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/**
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* Get all exposed models.
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*/
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app.models = function () {
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return this._models;
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}
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/**
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* Define a DataSource.
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*/
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app.dataSource = function (name, config) {
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this.dataSources[name] =
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this.dataSources[classify(name)] =
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this.dataSources[camelize(name)] = dataSourcesFromConfig(config);
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}
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/**
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* Get all remote objects.
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*/
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app.remoteObjects = function () {
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var result = {};
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var models = this.models();
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// add in models
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models.forEach(function (ModelCtor) {
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// only add shared models
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if(ModelCtor.shared && typeof ModelCtor.sharedCtor === 'function') {
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result[ModelCtor.pluralModelName] = ModelCtor;
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}
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});
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return result;
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}
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/**
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* Get the apps set of remote objects.
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*/
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app.remotes = function () {
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return this._remotes || (this._remotes = RemoteObjects.create());
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}
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/**
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* Enable documentation
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*/
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app.docs = function (options) {
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var remotes = this.remotes();
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swagger(remotes, options);
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}
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/*!
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* Get a handler of the specified type from the handler cache.
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*/
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app.handler = function (type) {
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var handlers = this._handlers || (this._handlers = {});
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if(handlers[type]) {
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return handlers[type];
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}
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var remotes = this.remotes();
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var handler = this._handlers[type] = remotes.handler(type);
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return handler;
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}
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/**
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* An object to store dataSource instances.
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*/
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app.dataSources = app.datasources = {};
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/**
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* Initialize the app using JSON and JavaScript files.
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*
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* @throws {Error} If config is not valid
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* @throws {Error} If boot fails
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*/
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app.boot = function(options) {
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options = options || {};
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if(typeof options === 'string') {
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options = {appRootDir: options};
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}
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var app = this;
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var appRootDir = options.appRootDir = options.appRootDir || process.cwd();
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var ctx = {};
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var appConfig = options.app;
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var modelConfig = options.models;
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var dataSourceConfig = options.dataSources;
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if(!appConfig) {
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appConfig = tryReadConfig(appRootDir, 'app') || {};
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}
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if(!modelConfig) {
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modelConfig = tryReadConfig(appRootDir, 'models') || {};
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}
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if(!dataSourceConfig) {
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dataSourceConfig = tryReadConfig(appRootDir, 'datasources') || {};
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}
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assertIsValidConfig('app', appConfig);
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assertIsValidConfig('model', modelConfig);
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assertIsValidConfig('data source', dataSourceConfig);
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if(appConfig.host !== undefined) {
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assert(typeof appConfig.host === 'string', 'app.host must be a string');
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app.set('host', appConfig.host);
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}
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if(appConfig.port !== undefined) {
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var portType = typeof appConfig.port;
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assert(portType === 'string' || portType === 'number', 'app.port must be a string or number');
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app.set('port', appConfig.port);
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}
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// instantiate data sources
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forEachKeyedObject(dataSourceConfig, function(key, obj) {
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app.dataSource(key, obj);
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});
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// instantiate models
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forEachKeyedObject(modelConfig, function(key, obj) {
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app.model(key, obj);
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});
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// require directories
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var requiredModels = requireDir(path.join(appRootDir, 'models'));
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}
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function assertIsValidConfig(name, config) {
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if(config) {
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assert(typeof config === 'object', name + ' config must be a valid JSON object');
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}
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}
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function forEachKeyedObject(obj, fn) {
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if(typeof obj !== 'object') return;
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Object.keys(obj).forEach(function(key) {
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fn(key, obj[key]);
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});
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}
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function classify(str) {
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return stringUtils.classify(str);
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}
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function camelize(str) {
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return stringUtils.camelize(str);
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}
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function dataSourcesFromConfig(config) {
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var connectorPath;
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assert(typeof config === 'object',
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'cannont create data source without config object');
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if(typeof config.connector === 'string') {
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connectorPath = path.join(__dirname, 'connectors', config.connector+'.js');
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if(fs.existsSync(connectorPath)) {
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config.connector = require(connectorPath);
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}
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}
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return require('./loopback').createDataSource(config);
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}
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function modelFromConfig(name, config, app) {
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var ModelCtor = require('./loopback').createModel(name, config.properties, config.options);
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var dataSource = app.dataSources[config.dataSource];
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assert(isDataSource(dataSource), name + ' is referencing a dataSource that does not exist: "'+ config.dataSource +'"');
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ModelCtor.attachTo(dataSource);
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return ModelCtor;
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}
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function requireDir(dir, basenames) {
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assert(dir, 'cannot require directory contents without directory name');
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var requires = {};
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if (arguments.length === 2) {
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// if basenames argument is passed, explicitly include those files
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basenames.forEach(function (basename) {
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var filepath = Path.resolve(Path.join(dir, basename));
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requires[basename] = tryRequire(filepath);
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});
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} else if (arguments.length === 1) {
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// if basenames arguments isn't passed, require all javascript
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// files (except for those prefixed with _) and all directories
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var files = tryReadDir(dir);
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// sort files in lowercase alpha for linux
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files.sort(function (a,b) {
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a = a.toLowerCase();
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b = b.toLowerCase();
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if (a < b) {
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return -1;
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} else if (b < a) {
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return 1;
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} else {
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return 0;
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}
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});
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files.forEach(function (filename) {
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// ignore index.js and files prefixed with underscore
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if ((filename === 'index.js') || (filename[0] === '_')) { return; }
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var filepath = path.resolve(path.join(dir, filename));
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var ext = path.extname(filename);
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var stats = fs.statSync(filepath);
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// only require files supported by require.extensions (.txt .md etc.)
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if (stats.isFile() && !(ext in require.extensions)) { return; }
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var basename = path.basename(filename, ext);
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requires[basename] = tryRequire(filepath);
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});
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}
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return requires;
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};
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function tryRequire(modulePath) {
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try {
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return require.apply(this, arguments);
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} catch(e) {
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console.error('failed to require "%s"', modulePath);
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throw e;
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}
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}
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function tryReadDir() {
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try {
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return fs.readdirSync.apply(fs, arguments);
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} catch(e) {
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return [];
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}
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}
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function isModelCtor(obj) {
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return typeof obj === 'function' && obj.modelName && obj.name === 'ModelCtor';
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}
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function isDataSource(obj) {
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return obj instanceof DataSource;
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}
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function tryReadConfig(cwd, fileName) {
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try {
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return require(path.join(cwd, fileName + '.json'));
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} catch(e) {
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if(e.code !== "MODULE_NOT_FOUND") {
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throw e;
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}
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}
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}
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