858 lines
23 KiB
JavaScript
858 lines
23 KiB
JavaScript
/**
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* Module dependencies
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*/
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var ModelBuilder = require('./model-builder.js').ModelBuilder;
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var jutil = require('./jutil');
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var ModelBaseClass = require('./model.js');
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var DataAccessObject = require('./dao.js');
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var List = require('./list.js');
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var EventEmitter = require('events').EventEmitter;
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var util = require('util');
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var path = require('path');
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var fs = require('fs');
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var async = require('async');
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var existsSync = fs.existsSync || path.existsSync;
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/**
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* Export public API
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*/
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exports.DataSource = DataSource;
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/**
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* Helpers
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*/
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var slice = Array.prototype.slice;
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/**
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* DataSource - adapter-specific classes factory.
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*
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* All classes in single schema shares same adapter type and
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* one database connection
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*
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* @param name - type of schema adapter (mysql, mongoose, sequelize, redis)
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* @param settings - any database-specific settings which we need to
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* establish connection (of course it depends on specific adapter)
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*
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* - host
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* - port
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* - username
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* - password
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* - database
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* - debug {Boolean} = false
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*
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* @example DataSource creation, waiting for connection callback
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* ```
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* var schema = new DataSource('mysql', { database: 'myapp_test' });
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* schema.define(...);
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* schema.on('connected', function () {
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* // work with database
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* });
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* ```
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*/
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function DataSource(name, settings) {
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if (!(this instanceof DataSource)) {
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return new DataSource(name, settings);
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}
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ModelBuilder.call(this, arguments);
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this.setup(name, settings);
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// default DataAccessObject
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this.DataAccessObject = this.constructor.DataAccessObject;
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this.DataAccessObject.call(this, arguments);
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};
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util.inherits(DataSource, ModelBuilder);
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// allow child classes to supply a data access object
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DataSource.DataAccessObject = DataAccessObject;
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// Copy over statics
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for (var m in ModelBuilder) {
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if (!DataSource.hasOwnProperty(m) && 'super_' !== m) {
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DataSource[m] = ModelBuilder[m];
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}
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}
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DataSource.prototype.setup = function(name, settings) {
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var schema = this;
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// just save everything we get
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this.name = name;
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this.settings = settings;
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// Disconnected by default
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this.connected = false;
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this.connecting = false;
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if (name) {
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// and initialize schema using adapter
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// this is only one initialization entry point of adapter
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// this module should define `adapter` member of `this` (schema)
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var adapter;
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if (typeof name === 'object') {
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adapter = name;
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this.name = adapter.name;
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} else if (name.match(/^\//)) {
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// try absolute path
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adapter = require(name);
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} else if (existsSync(__dirname + '/adapters/' + name + '.js')) {
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// try built-in adapter
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adapter = require('./adapters/' + name);
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} else {
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// try foreign adapter
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try {
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adapter = require('jugglingdb-' + name);
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} catch (e) {
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return console.log('\nWARNING: JugglingDB adapter "' + name + '" is not installed,\nso your models would not work, to fix run:\n\n npm install jugglingdb-' + name, '\n');
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}
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}
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}
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if (adapter) {
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adapter.initialize(this, function () {
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// we have an adaper now?
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if (!this.adapter) {
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throw new Error('Adapter is not defined correctly: it should create `adapter` member of schema');
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}
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this.adapter.log = function (query, start) {
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schema.log(query, start);
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};
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this.adapter.logger = function (query) {
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var t1 = Date.now();
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var log = this.log;
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return function (q) {
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log(q || query, t1);
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};
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};
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this.connected = true;
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this.emit('connected');
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}.bind(this));
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}
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schema.connect = function(cb) {
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var schema = this;
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if(schema.connected) {
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if (cb) {
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process.nextTick(cb);
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}
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return;
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}
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schema.connecting = true;
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if (schema.adapter.connect) {
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schema.adapter.connect(function(err) {
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if (!err) {
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schema.connected = true;
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schema.connecting = false;
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schema.emit('connected');
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}
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if (cb) {
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cb(err);
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}
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});
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} else {
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if (cb) {
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process.nextTick(cb);
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}
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}
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};
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}
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/**
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* Define class
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*
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* @param {String} className
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* @param {Object} properties - hash of class properties in format
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* `{property: Type, property2: Type2, ...}`
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* or
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* `{property: {type: Type}, property2: {type: Type2}, ...}`
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* @param {Object} settings - other configuration of class
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* @return newly created class
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*
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* @example simple case
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* ```
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* var User = schema.define('User', {
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* email: String,
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* password: String,
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* birthDate: Date,
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* activated: Boolean
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* });
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* ```
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* @example more advanced case
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* ```
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* var User = schema.define('User', {
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* email: { type: String, limit: 150, index: true },
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* password: { type: String, limit: 50 },
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* birthDate: Date,
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* registrationDate: {type: Date, default: function () { return new Date }},
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* activated: { type: Boolean, default: false }
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* });
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* ```
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*/
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DataSource.prototype.define = function defineClass(className, properties, settings) {
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var args = slice.call(arguments);
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if (!className) throw new Error('Class name required');
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if (args.length == 1) properties = {}, args.push(properties);
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if (args.length == 2) settings = {}, args.push(settings);
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properties = properties || {};
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settings = settings || {};
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var NewClass = ModelBuilder.prototype.define.call(this, className, properties, settings);
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// add data access objects
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this.mixin(NewClass);
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if(this.adapter) {
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// pass control to adapter
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this.adapter.define({
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model: NewClass,
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properties: properties,
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settings: settings
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});
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}
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return NewClass;
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};
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/**
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* Mixin DataAccessObject methods.
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*/
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DataSource.prototype.mixin = function (ModelCtor) {
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// inherit DataAccessObject methods
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jutil.mixin(ModelCtor, this.DataAccessObject);
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}
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/**
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* Attach an existing model to a data source.
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*/
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DataSource.prototype.attach = function (ModelCtor) {
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var properties = ModelCtor.schema.definitions[ModelCtor.modelName].properties;
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var settings = ModelCtor.schema.definitions[ModelCtor.modelName].settings;
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var className = ModelCtor.modelName;
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this.mixin(ModelCtor);
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if(this.adapter) {
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// pass control to adapter
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this.adapter.define({
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model: ModelCtor,
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properties: properties,
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settings: settings
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});
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}
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// redefine the schema
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hiddenProperty(ModelCtor, 'schema', this);
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// add to def
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this.definitions[className] = {
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properties: properties,
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settings: settings
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};
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this.models[className] = ModelCtor;
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return this;
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}
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/**
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* Define single property named `prop` on `model`
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*
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* @param {String} model - name of model
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* @param {String} prop - name of propery
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* @param {Object} params - property settings
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*/
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DataSource.prototype.defineProperty = function (model, prop, params) {
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ModelBuilder.prototype.defineProperty.call(this, model, prop, params);
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if (this.adapter.defineProperty) {
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this.adapter.defineProperty(model, prop, params);
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}
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};
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/**
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* Drop each model table and re-create.
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* This method make sense only for sql adapters.
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*
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* @warning All data will be lost! Use autoupdate if you need your data.
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*/
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DataSource.prototype.automigrate = function (cb) {
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this.freeze();
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if (this.adapter.automigrate) {
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this.adapter.automigrate(cb);
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} else if (cb) {
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cb();
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}
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};
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/**
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* Update existing database tables.
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* This method make sense only for sql adapters.
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*/
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DataSource.prototype.autoupdate = function (cb) {
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this.freeze();
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if (this.adapter.autoupdate) {
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this.adapter.autoupdate(cb);
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} else if (cb) {
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cb();
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}
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};
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/**
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* Discover existing database tables.
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* This method returns an array of model objects, including {type, name, onwer}
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*
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* @param options An object that contains the following settings:
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* all: true - Discovering all models, false - Discovering the models owned by the current user
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* views: true - Including views, false - only tables
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* limit: The page size
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* offset: The starting index
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*/
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DataSource.prototype.discoverModels = function (options, cb) {
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this.freeze();
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if (this.adapter.discoverModels) {
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this.adapter.discoverModels(options, cb);
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} else if (cb) {
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cb();
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}
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};
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/**
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* Discover properties for a given model.
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* @param owner The owner
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* @param table The table/view name
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* @param cb Callback
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* The method return an array of properties, including {owner, tableName, columnName, dataType, dataLength, nullable}
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*/
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DataSource.prototype.discoverModelProperties = function (owner, table, cb) {
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this.freeze();
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if (this.adapter.discoverModelProperties) {
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this.adapter.discoverModelProperties(owner, table, cb);
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} else if (cb) {
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cb();
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}
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};
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/**
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* Discover primary keys for a given owner/table
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*
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* Each primary key column description has the following columns:
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* owner String => table schema (may be null)
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* tableName String => table name
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* columnName String => column name
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* keySeq Number => sequence number within primary key( a value of 1 represents the first column of the primary key, a value of 2 would represent the second column within the primary key).
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* pkName String => primary key name (may be null)
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*
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* @param owner The owner, default to current user
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* @param table The table name
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* @param cb Callback
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*/
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DataSource.prototype.discoverPrimaryKeys= function(owner, table, cb) {
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this.freeze();
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if (this.adapter.discoverPrimaryKeys) {
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this.adapter.discoverPrimaryKeys(owner, table, cb);
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} else if (cb) {
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cb();
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}
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}
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/**
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* Discover foreign keys for a given owner/table
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*
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* fkOwner String => foreign key table schema (may be null)
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* fkName String => foreign key name (may be null)
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* fkTableName String => foreign key table name
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* fkColumnName String => foreign key column name
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* keySeq short => sequence number within a foreign key( a value of 1 represents the first column of the foreign key, a value of 2 would represent the second column within the foreign key).
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* pkOwner String => primary key table schema being imported (may be null)
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* pkName String => primary key name (may be null)
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* pkTableName String => primary key table name being imported
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* pkColumnName String => primary key column name being imported
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*
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* @param owner
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* @param table
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* @param cb
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*/
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DataSource.prototype.discoverForeignKeys= function(owner, table, cb) {
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this.freeze();
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if (this.adapter.discoverForeignKeys) {
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this.adapter.discoverForeignKeys(owner, table, cb);
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} else if (cb) {
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cb();
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}
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}
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function capitalize(str) {
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if (!str) {
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return str;
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}
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return str.charAt(0).toUpperCase() + ((str.length > 1) ? str.slice(1).toLowerCase() : '');
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}
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function fromDBName(dbName, camelCase) {
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if (!dbName) {
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return dbName;
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}
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var parts = dbName.split(/-|_/);
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parts[0] = camelCase ? parts[0].toLowerCase() : capitalize(parts[0]);
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for (var i = 1; i < parts.length; i++) {
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parts[i] = capitalize(parts[i]);
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}
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return parts.join('');
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}
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DataSource.prototype.discoverSchema = function (owner, table, cb) {
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this.discoverSchemas(owner, table, {visited: {}, associations: false}, function(err, schemas) {
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if(err) {
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cb && cb(err, schemas);
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return;
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}
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for(var s in schemas) {
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cb && cb(null, schemas[s]);
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return;
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}
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});
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}
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/**
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* Discover schema from a given table/view
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* @param owner
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* @param table
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* @param cb
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*/
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DataSource.prototype.discoverSchemas = function (owner, table, options, cb) {
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var self = this;
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var dataSourceName = this.name || this.adapter.name;
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var tasks = [
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this.discoverModelProperties.bind(this, owner, table),
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this.discoverPrimaryKeys.bind(this, owner, table) ];
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if (options.associations) {
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tasks.push(this.discoverForeignKeys.bind(this, owner, table));
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}
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async.parallel(tasks, function (err, results) {
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if (err) {
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cb && cb(err);
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return;
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}
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var columns = results[0];
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if (!columns) {
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cb && cb();
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return;
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}
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// Handle primary keys
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var primaryKeys = results[1];
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var pks = {};
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primaryKeys.forEach(function (pk) {
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pks[pk.columnName] = pk.keySeq;
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});
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if (self.settings.debug) {
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console.log('Primary keys: ', pks);
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}
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var schema = {
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name: fromDBName(table, false),
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options: {
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idInjection: false // DO NOT add id property
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},
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properties: {
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}
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};
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schema.options[dataSourceName] = {
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schema: columns[0].owner,
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table: table
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};
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columns.forEach(function (item) {
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var i = item;
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var propName = fromDBName(item.columnName, true);
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schema.properties[propName] = {
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type: item.type,
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required: (item.nullable === 'N'),
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length: item.dataLength
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};
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if (pks[item.columnName]) {
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schema.properties[propName].id = pks[item.columnName];
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}
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schema.properties[propName][dataSourceName] = {
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columnName: i.columnName,
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dataType: i.dataType,
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dataLength: i.dataLength,
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nullable: i.nullable
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};
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});
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// Add current table to the visited tables
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options.visited = options.visited || {};
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var schemaKey = columns[0].owner + '.' + table;
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if (!options.visited.hasOwnProperty(schemaKey)) {
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if(self.settings.debug) {
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console.log('Adding schema for ' + schemaKey);
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}
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options.visited[schemaKey] = schema;
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}
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var otherTables = {};
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if (options.associations) {
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// Handle foreign keys
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var fks = {};
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var foreignKeys = results[2];
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foreignKeys.forEach(function (fk) {
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var fkInfo = {
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keySeq: fk.keySeq,
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owner: fk.pkOwner,
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tableName: fk.pkTableName,
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columnName: fk.pkColumnName
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};
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if (fks[fk.fkName]) {
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fks[fk.fkName].push(fkInfo);
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} else {
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fks[fk.fkName] = [fkInfo];
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}
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});
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if (self.settings.debug) {
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console.log('Foreign keys: ', fks);
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}
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foreignKeys.forEach(function (fk) {
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var propName = fromDBName(fk.pkTableName, true);
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schema.properties[propName] = {
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type: fromDBName(fk.pkTableName, false),
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association: {
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type: 'belongsTo',
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foreignKey: fromDBName(fk.pkColumnName, true)
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}
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};
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var key = fk.pkOwner + '.' + fk.pkTableName;
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if (!options.visited.hasOwnProperty(key) && !otherTables.hasOwnProperty(key)) {
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otherTables[key] = {owner: fk.pkOwner, tableName: fk.pkTableName};
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}
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});
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}
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if (Object.keys(otherTables).length === 0) {
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cb && cb(null, options.visited);
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} else {
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var moreTasks = [];
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for (var t in otherTables) {
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if(self.settings.debug) {
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console.log('Discovering related schema for ' + schemaKey);
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}
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moreTasks.push(DataSource.prototype.discoverSchemas.bind(self, otherTables[t].owner, otherTables[t].tableName, options));
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}
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async.parallel(moreTasks, function (err, results) {
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var result = results && results[0];
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cb && cb(err, result);
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});
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}
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});
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}
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/**
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* Check whether migrations needed
|
|
* This method make sense only for sql adapters.
|
|
*/
|
|
DataSource.prototype.isActual = function (cb) {
|
|
this.freeze();
|
|
if (this.adapter.isActual) {
|
|
this.adapter.isActual(cb);
|
|
} else if (cb) {
|
|
cb(null, true);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Log benchmarked message. Do not redefine this method, if you need to grab
|
|
* chema logs, use `schema.on('log', ...)` emitter event
|
|
*
|
|
* @private used by adapters
|
|
*/
|
|
DataSource.prototype.log = function (sql, t) {
|
|
this.emit('log', sql, t);
|
|
};
|
|
|
|
/**
|
|
* Freeze schema. Behavior depends on adapter
|
|
*/
|
|
DataSource.prototype.freeze = function freeze() {
|
|
if (this.adapter.freezeSchema) {
|
|
this.adapter.freezeSchema();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return table name for specified `modelName`
|
|
* @param {String} modelName
|
|
*/
|
|
DataSource.prototype.tableName = function (modelName) {
|
|
var settings = this.definitions[modelName].settings;
|
|
if(settings[this.adapter.name]) {
|
|
return settings[this.adapter.name].table || modelName;
|
|
} else {
|
|
return modelName;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Return column name for specified modelName and propertyName
|
|
* @param modelName
|
|
* @param propertyName
|
|
* @returns {String} columnName
|
|
*/
|
|
DataSource.prototype.columnName = function (modelName, propertyName) {
|
|
if(!propertyName) {
|
|
return propertyName;
|
|
}
|
|
var property = this.definitions[modelName].properties[propertyName];
|
|
if(property && property[this.adapter.name]) {
|
|
return property[this.adapter.name].columnName || propertyName;
|
|
} else {
|
|
return propertyName;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Return column metadata for specified modelName and propertyName
|
|
* @param modelName
|
|
* @param propertyName
|
|
* @returns {Object} column metadata
|
|
*/
|
|
DataSource.prototype.columnMetadata = function (modelName, propertyName) {
|
|
if(!propertyName) {
|
|
return propertyName;
|
|
}
|
|
var property = this.definitions[modelName].properties[propertyName];
|
|
if(property && property[this.adapter.name]) {
|
|
return property[this.adapter.name];
|
|
} else {
|
|
return null;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Return column names for specified modelName
|
|
* @param modelName
|
|
* @returns {[String]} column names
|
|
*/
|
|
DataSource.prototype.columnNames = function (modelName) {
|
|
var props = this.definitions[modelName].properties;
|
|
var cols = [];
|
|
for(var p in props) {
|
|
if(props[p][this.adapter.name]) {
|
|
cols.push(props[p][this.adapter.name].columnName || p);
|
|
} else {
|
|
cols.push(p);
|
|
}
|
|
}
|
|
return cols;
|
|
};
|
|
|
|
/**
|
|
* Find the ID column name
|
|
* @param modelName
|
|
* @returns {String} columnName for ID
|
|
*/
|
|
DataSource.prototype.idColumnName = function(modelName) {
|
|
return this.columnName(modelName, this.idName(modelName));
|
|
}
|
|
|
|
/**
|
|
* Find the ID property name
|
|
* @param modelName
|
|
* @returns {String} property for ID
|
|
*/
|
|
DataSource.prototype.idName = function(modelName) {
|
|
var props = this.definitions[modelName].properties;
|
|
for(var key in props) {
|
|
if(props[key].id) {
|
|
return key;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Find the ID property names sorted by the index
|
|
* @param modelName
|
|
* @returns {[String]} property names for IDs
|
|
*/
|
|
DataSource.prototype.idNames = function (modelName) {
|
|
var ids = [];
|
|
var props = this.definitions[modelName].properties;
|
|
for (var key in props) {
|
|
if (props[key].id && props[key].id > 0) {
|
|
ids.push({name: key, id: props[key].id});
|
|
}
|
|
}
|
|
ids.sort(function (a, b) {
|
|
return a.key - b.key;
|
|
});
|
|
var names = ids.map(function (id) {
|
|
return id.name;
|
|
});
|
|
return names;
|
|
}
|
|
|
|
|
|
/**
|
|
* Define foreign key
|
|
* @param {String} className
|
|
* @param {String} key - name of key field
|
|
*/
|
|
DataSource.prototype.defineForeignKey = function defineForeignKey(className, key, foreignClassName) {
|
|
// quit if key already defined
|
|
if (this.definitions[className].properties[key]) return;
|
|
|
|
if (this.adapter.defineForeignKey) {
|
|
var cb = function (err, keyType) {
|
|
if (err) throw err;
|
|
this.definitions[className].properties[key] = {type: keyType};
|
|
}.bind(this);
|
|
switch (this.adapter.defineForeignKey.length) {
|
|
case 4:
|
|
this.adapter.defineForeignKey(className, key, foreignClassName, cb);
|
|
break;
|
|
default:
|
|
case 3:
|
|
this.adapter.defineForeignKey(className, key, cb);
|
|
break;
|
|
}
|
|
} else {
|
|
this.definitions[className].properties[key] = {type: Number};
|
|
}
|
|
|
|
this.models[className].registerProperty(key);
|
|
};
|
|
|
|
/**
|
|
* Close database connection
|
|
*/
|
|
DataSource.prototype.disconnect = function disconnect(cb) {
|
|
if (typeof this.adapter.disconnect === 'function') {
|
|
this.connected = false;
|
|
this.adapter.disconnect(cb);
|
|
} else if (cb) {
|
|
cb();
|
|
}
|
|
};
|
|
|
|
DataSource.prototype.copyModel = function copyModel(Master) {
|
|
var schema = this;
|
|
var className = Master.modelName;
|
|
var md = Master.schema.definitions[className];
|
|
var Slave = function SlaveModel() {
|
|
Master.apply(this, [].slice.call(arguments));
|
|
this.schema = schema;
|
|
};
|
|
|
|
util.inherits(Slave, Master);
|
|
|
|
Slave.__proto__ = Master;
|
|
|
|
hiddenProperty(Slave, 'schema', schema);
|
|
hiddenProperty(Slave, 'modelName', className);
|
|
hiddenProperty(Slave, 'relations', Master.relations);
|
|
|
|
if (!(className in schema.models)) {
|
|
|
|
// store class in model pool
|
|
schema.models[className] = Slave;
|
|
schema.definitions[className] = {
|
|
properties: md.properties,
|
|
settings: md.settings
|
|
};
|
|
|
|
if (!schema.isTransaction) {
|
|
schema.adapter.define({
|
|
model: Slave,
|
|
properties: md.properties,
|
|
settings: md.settings
|
|
});
|
|
}
|
|
|
|
}
|
|
|
|
return Slave;
|
|
};
|
|
|
|
DataSource.prototype.transaction = function() {
|
|
var schema = this;
|
|
var transaction = new EventEmitter;
|
|
transaction.isTransaction = true;
|
|
transaction.origin = schema;
|
|
transaction.name = schema.name;
|
|
transaction.settings = schema.settings;
|
|
transaction.connected = false;
|
|
transaction.connecting = false;
|
|
transaction.adapter = schema.adapter.transaction();
|
|
|
|
// create blank models pool
|
|
transaction.models = {};
|
|
transaction.definitions = {};
|
|
|
|
for (var i in schema.models) {
|
|
schema.copyModel.call(transaction, schema.models[i]);
|
|
}
|
|
|
|
transaction.connect = schema.connect;
|
|
|
|
transaction.exec = function(cb) {
|
|
transaction.adapter.exec(cb);
|
|
};
|
|
|
|
return transaction;
|
|
};
|
|
|
|
/**
|
|
* Define hidden property
|
|
*/
|
|
function hiddenProperty(where, property, value) {
|
|
Object.defineProperty(where, property, {
|
|
writable: false,
|
|
enumerable: false,
|
|
configurable: false,
|
|
value: value
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Define readonly property on object
|
|
*
|
|
* @param {Object} obj
|
|
* @param {String} key
|
|
* @param {Mixed} value
|
|
*/
|
|
function defineReadonlyProp(obj, key, value) {
|
|
Object.defineProperty(obj, key, {
|
|
writable: false,
|
|
enumerable: true,
|
|
configurable: true,
|
|
value: value
|
|
});
|
|
}
|
|
|