526 lines
14 KiB
JavaScript
526 lines
14 KiB
JavaScript
/**
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* Module dependencies
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*/
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var ADL = require('./adl.js').Schema;
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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 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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ADL.call(this);
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this.setup(name, settings);
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};
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util.inherits(DataSource, ADL);
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// Copy over statics
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for (var m in ADL) {
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if (!DataSource.hasOwnProperty(m) && 'super_' !== m) {
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DataSource[m] = ADL[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 = ADL.prototype.define.call(this, className, properties, settings);
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// inherit DataAccessObject methods
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for (var m in DataAccessObject) {
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NewClass[m] = DataAccessObject[m];
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}
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for (var n in DataAccessObject.prototype) {
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NewClass.prototype[n] = DataAccessObject.prototype[n];
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}
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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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* 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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ADL.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 options An object that contains the following settings:
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* model: The model name
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* limit: The page size
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* offset: The starting index
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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 (options, cb) {
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this.freeze();
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if (this.adapter.discoverModelProperties) {
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this.adapter.discoverModelProperties(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 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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* TABLE_SCHEM String => table schema (may be null)
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* TABLE_NAME String => table name
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* COLUMN_NAME String => column name
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* KEY_SEQ short => 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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* PK_NAME String => primary key name (may be null)
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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.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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* PKTABLE_SCHEM String => primary key table schema being imported (may be null)
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* PKTABLE_NAME String => primary key table name being imported
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* PKCOLUMN_NAME String => primary key column name being imported
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* FKTABLE_CAT String => foreign key table catalog (may be null)
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* FKTABLE_SCHEM String => foreign key table schema (may be null)
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* FKTABLE_NAME String => foreign key table name
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* FKCOLUMN_NAME String => foreign key column name
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* KEY_SEQ 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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* FK_NAME String => foreign key name (may be null)
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* PK_NAME String => primary key name (may be null)
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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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/**
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* Check whether migrations needed
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* This method make sense only for sql adapters.
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*/
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DataSource.prototype.isActual = function (cb) {
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this.freeze();
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if (this.adapter.isActual) {
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this.adapter.isActual(cb);
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} else if (cb) {
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cb(null, true);
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}
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};
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/**
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* Log benchmarked message. Do not redefine this method, if you need to grab
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* chema logs, use `schema.on('log', ...)` emitter event
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*
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* @private used by adapters
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*/
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DataSource.prototype.log = function (sql, t) {
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this.emit('log', sql, t);
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};
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/**
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* Freeze schema. Behavior depends on adapter
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*/
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DataSource.prototype.freeze = function freeze() {
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if (this.adapter.freezeSchema) {
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this.adapter.freezeSchema();
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}
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}
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/**
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* Return table name for specified `modelName`
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* @param {String} modelName
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*/
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DataSource.prototype.tableName = function (modelName) {
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return this.definitions[modelName].settings.table = this.definitions[modelName].settings.table || modelName
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};
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/**
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* Define foreign key
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* @param {String} className
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* @param {String} key - name of key field
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*/
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DataSource.prototype.defineForeignKey = function defineForeignKey(className, key, foreignClassName) {
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// quit if key already defined
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if (this.definitions[className].properties[key]) return;
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if (this.adapter.defineForeignKey) {
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var cb = function (err, keyType) {
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if (err) throw err;
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this.definitions[className].properties[key] = {type: keyType};
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}.bind(this);
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switch (this.adapter.defineForeignKey.length) {
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case 4:
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this.adapter.defineForeignKey(className, key, foreignClassName, cb);
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break;
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default:
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case 3:
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this.adapter.defineForeignKey(className, key, cb);
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break;
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}
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} else {
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this.definitions[className].properties[key] = {type: Number};
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}
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this.models[className].registerProperty(key);
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};
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/**
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* Close database connection
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*/
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DataSource.prototype.disconnect = function disconnect(cb) {
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if (typeof this.adapter.disconnect === 'function') {
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this.connected = false;
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this.adapter.disconnect(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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DataSource.prototype.copyModel = function copyModel(Master) {
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var schema = this;
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var className = Master.modelName;
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var md = Master.schema.definitions[className];
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var Slave = function SlaveModel() {
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Master.apply(this, [].slice.call(arguments));
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this.schema = schema;
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};
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util.inherits(Slave, Master);
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Slave.__proto__ = Master;
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hiddenProperty(Slave, 'schema', schema);
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hiddenProperty(Slave, 'modelName', className);
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hiddenProperty(Slave, 'relations', Master.relations);
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if (!(className in schema.models)) {
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// store class in model pool
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schema.models[className] = Slave;
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schema.definitions[className] = {
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properties: md.properties,
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settings: md.settings
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};
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if (!schema.isTransaction) {
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schema.adapter.define({
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model: Slave,
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properties: md.properties,
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settings: md.settings
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});
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}
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}
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return Slave;
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};
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DataSource.prototype.transaction = function() {
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var schema = this;
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var transaction = new EventEmitter;
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transaction.isTransaction = true;
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transaction.origin = schema;
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transaction.name = schema.name;
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transaction.settings = schema.settings;
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transaction.connected = false;
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transaction.connecting = false;
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transaction.adapter = schema.adapter.transaction();
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// create blank models pool
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transaction.models = {};
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transaction.definitions = {};
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for (var i in schema.models) {
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schema.copyModel.call(transaction, schema.models[i]);
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}
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transaction.connect = schema.connect;
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transaction.exec = function(cb) {
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transaction.adapter.exec(cb);
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};
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return transaction;
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};
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/**
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* Define hidden property
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*/
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function hiddenProperty(where, property, value) {
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Object.defineProperty(where, property, {
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writable: false,
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enumerable: false,
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configurable: false,
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value: value
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});
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}
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/**
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* Define readonly property on object
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*
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* @param {Object} obj
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* @param {String} key
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* @param {Mixed} value
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*/
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function defineReadonlyProp(obj, key, value) {
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Object.defineProperty(obj, key, {
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writable: false,
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enumerable: true,
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configurable: true,
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value: value
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});
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}
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