1681 lines
56 KiB
JavaScript
1681 lines
56 KiB
JavaScript
/*!
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* Module Dependencies.
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*/
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var runtime = require('./runtime');
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var assert = require('assert');
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var async = require('async');
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var deprecated = require('depd')('loopback');
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var debug = require('debug')('loopback:persisted-model');
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var PassThrough = require('stream').PassThrough;
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var utils = require('./utils');
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module.exports = function(registry) {
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var Model = registry.getModel('Model');
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/**
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* Extends Model with basic query and CRUD support.
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*
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* **Change Event**
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*
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* Listen for model changes using the `change` event.
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*
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* ```js
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* MyPersistedModel.on('changed', function(obj) {
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* console.log(obj) // => the changed model
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* });
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* ```
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*
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* @class PersistedModel
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*/
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var PersistedModel = Model.extend('PersistedModel');
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/*!
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* Setup the `PersistedModel` constructor.
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*/
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PersistedModel.setup = function setupPersistedModel() {
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// call Model.setup first
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Model.setup.call(this);
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var PersistedModel = this;
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// enable change tracking (usually for replication)
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if (this.settings.trackChanges) {
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PersistedModel._defineChangeModel();
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PersistedModel.once('dataSourceAttached', function() {
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PersistedModel.enableChangeTracking();
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});
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} else if (this.settings.enableRemoteReplication) {
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PersistedModel._defineChangeModel();
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}
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PersistedModel.setupRemoting();
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};
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/*!
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* Throw an error telling the user that the method is not available and why.
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*/
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function throwNotAttached(modelName, methodName) {
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throw new Error(
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'Cannot call ' + modelName + '.' + methodName + '().' +
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' The ' + methodName + ' method has not been setup.' +
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' The PersistedModel has not been correctly attached to a DataSource!'
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);
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}
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/*!
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* Convert null callbacks to 404 error objects.
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* @param {HttpContext} ctx
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* @param {Function} cb
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*/
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function convertNullToNotFoundError(ctx, cb) {
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if (ctx.result !== null) return cb();
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var modelName = ctx.method.sharedClass.name;
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var id = ctx.getArgByName('id');
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var msg = 'Unknown "' + modelName + '" id "' + id + '".';
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var error = new Error(msg);
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error.statusCode = error.status = 404;
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error.code = 'MODEL_NOT_FOUND';
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cb(error);
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}
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/**
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* Create new instance of Model, and save to database.
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*
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* @param {Object}|[{Object}] data Optional data argument. Can be either a single model instance or an array of instances.
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*
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* @callback {Function} callback Callback function called with `cb(err, obj)` signature.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Object} models Model instances or null.
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*/
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PersistedModel.create = function(data, callback) {
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throwNotAttached(this.modelName, 'create');
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};
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/**
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* Update or insert a model instance
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* @param {Object} data The model instance data to insert.
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* @callback {Function} callback Callback function called with `cb(err, obj)` signature.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Object} model Updated model instance.
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*/
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PersistedModel.upsert = PersistedModel.updateOrCreate = function upsert(data, callback) {
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throwNotAttached(this.modelName, 'upsert');
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};
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/**
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* Find one record matching the optional `where` filter. The same as `find`, but limited to one object.
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* Returns an object, not collection.
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* If not found, create the object using data provided as second argument.
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*
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* @param {Object} where Where clause, such as `{test: 'me'}`
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* <br/>see
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* [Where filter](https://docs.strongloop.com/display/LB/Where+filter#Wherefilter-Whereclauseforothermethods).
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* @param {Object} data Data to insert if object matching the `where` filter is not found.
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* @callback {Function} callback Callback function called with `cb(err, instance)` arguments. Required.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Object} instance Model instance matching the `where` filter, if found.
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*/
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PersistedModel.findOrCreate = function findOrCreate(query, data, callback) {
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throwNotAttached(this.modelName, 'findOrCreate');
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};
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PersistedModel.findOrCreate._delegate = true;
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/**
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* Check whether a model instance exists in database.
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*
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* @param {id} id Identifier of object (primary key value).
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*
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* @callback {Function} callback Callback function called with `(err, exists)` arguments. Required.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Boolean} exists True if the instance with the specified ID exists; false otherwise.
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*/
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PersistedModel.exists = function exists(id, cb) {
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throwNotAttached(this.modelName, 'exists');
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};
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/**
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* Find object by ID with an optional filter for include/fields.
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*
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* @param {*} id Primary key value
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* @options {Object} [filter] Optional Filter JSON object; see below.
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* @property {String|Object|Array} fields Identify fields to include in return result.
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* <br/>See [Fields filter](http://docs.strongloop.com/display/LB/Fields+filter).
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* @property {String|Object|Array} include See PersistedModel.include documentation.
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* <br/>See [Include filter](http://docs.strongloop.com/display/LB/Include+filter).
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* @callback {Function} callback Callback function called with `(err, instance)` arguments. Required.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Object} instance Model instance matching the specified ID or null if no instance matches.
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*/
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PersistedModel.findById = function find(id, filter, cb) {
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throwNotAttached(this.modelName, 'findById');
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};
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/**
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* Find all model instances that match `filter` specification.
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* See [Querying models](http://docs.strongloop.com/display/LB/Querying+models).
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*
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* @options {Object} [filter] Optional Filter JSON object; see below.
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* @property {String|Object|Array} fields Identify fields to include in return result.
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* <br/>See [Fields filter](http://docs.strongloop.com/display/LB/Fields+filter).
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* @property {String|Object|Array} include See PersistedModel.include documentation.
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* <br/>See [Include filter](http://docs.strongloop.com/display/LB/Include+filter).
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* @property {Number} limit Maximum number of instances to return.
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* <br/>See [Limit filter](http://docs.strongloop.com/display/LB/Limit+filter).
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* @property {String} order Sort order: either "ASC" for ascending or "DESC" for descending.
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* <br/>See [Order filter](http://docs.strongloop.com/display/LB/Order+filter).
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* @property {Number} skip Number of results to skip.
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* <br/>See [Skip filter](http://docs.strongloop.com/display/LB/Skip+filter).
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* @property {Object} where Where clause, like
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* ```
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* { where: { key: val, key2: {gt: 'val2'}, ...} }
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* ```
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* <br/>See
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* [Where filter](https://docs.strongloop.com/display/LB/Where+filter#Wherefilter-Whereclauseforqueries).
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*
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* @callback {Function} callback Callback function called with `(err, returned-instances)` arguments. Required.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Array} models Model instances matching the filter, or null if none found.
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*/
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PersistedModel.find = function find(filter, cb) {
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throwNotAttached(this.modelName, 'find');
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};
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/**
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* Find one model instance that matches `filter` specification.
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* Same as `find`, but limited to one result;
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* Returns object, not collection.
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*
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* @options {Object} [filter] Optional Filter JSON object; see below.
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* @property {String|Object|Array} fields Identify fields to include in return result.
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* <br/>See [Fields filter](http://docs.strongloop.com/display/LB/Fields+filter).
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* @property {String|Object|Array} include See PersistedModel.include documentation.
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* <br/>See [Include filter](http://docs.strongloop.com/display/LB/Include+filter).
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* @property {String} order Sort order: either "ASC" for ascending or "DESC" for descending.
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* <br/>See [Order filter](http://docs.strongloop.com/display/LB/Order+filter).
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* @property {Number} skip Number of results to skip.
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* <br/>See [Skip filter](http://docs.strongloop.com/display/LB/Skip+filter).
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* @property {Object} where Where clause, like
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* ```
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* {where: { key: val, key2: {gt: 'val2'}, ...} }
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* ```
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* <br/>See
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* [Where filter](https://docs.strongloop.com/display/LB/Where+filter#Wherefilter-Whereclauseforqueries).
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*
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* @callback {Function} callback Callback function called with `(err, returned-instance)` arguments. Required.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Array} model First model instance that matches the filter or null if none found.
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*/
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PersistedModel.findOne = function findOne(filter, cb) {
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throwNotAttached(this.modelName, 'findOne');
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};
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/**
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* Destroy all model instances that match the optional `where` specification.
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*
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* @param {Object} [where] Optional where filter, like:
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* ```
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* {key: val, key2: {gt: 'val2'}, ...}
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* ```
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* <br/>See
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* [Where filter](https://docs.strongloop.com/display/LB/Where+filter#Wherefilter-Whereclauseforothermethods).
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*
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* @callback {Function} callback Optional callback function called with `(err, info)` arguments.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Object} info Additional information about the command outcome.
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* @param {Number} info.count Number of instances (rows, documents) destroyed.
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*/
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PersistedModel.destroyAll = function destroyAll(where, cb) {
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throwNotAttached(this.modelName, 'destroyAll');
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};
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/**
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* Alias for `destroyAll`
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*/
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PersistedModel.remove = PersistedModel.destroyAll;
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/**
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* Alias for `destroyAll`
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*/
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PersistedModel.deleteAll = PersistedModel.destroyAll;
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/**
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* Update multiple instances that match the where clause.
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*
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* Example:
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*
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*```js
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* Employee.updateAll({managerId: 'x001'}, {managerId: 'x002'}, function(err, info) {
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* ...
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* });
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* ```
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*
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* @param {Object} [where] Optional `where` filter, like
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* ```
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* { key: val, key2: {gt: 'val2'}, ...}
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* ```
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* <br/>see
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* [Where filter](https://docs.strongloop.com/display/LB/Where+filter#Wherefilter-Whereclauseforothermethods).
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* @param {Object} data Object containing data to replace matching instances, if any.
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*
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* @callback {Function} callback Callback function called with `(err, info)` arguments. Required.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Object} info Additional information about the command outcome.
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* @param {Number} info.count Number of instances (rows, documents) updated.
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*
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*/
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PersistedModel.updateAll = function updateAll(where, data, cb) {
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throwNotAttached(this.modelName, 'updateAll');
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};
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/**
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* Alias for updateAll.
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*/
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PersistedModel.update = PersistedModel.updateAll;
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/**
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* Destroy model instance with the specified ID.
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* @param {*} id The ID value of model instance to delete.
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* @callback {Function} callback Callback function called with `(err)` arguments. Required.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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*/
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PersistedModel.destroyById = function deleteById(id, cb) {
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throwNotAttached(this.modelName, 'deleteById');
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};
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/**
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* Alias for destroyById.
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*/
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PersistedModel.removeById = PersistedModel.destroyById;
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/**
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* Alias for destroyById.
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*/
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PersistedModel.deleteById = PersistedModel.destroyById;
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/**
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* Return the number of records that match the optional "where" filter.
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* @param {Object} [where] Optional where filter, like
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* ```
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* { key: val, key2: {gt: 'val2'}, ...}
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* ```
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* <br/>See
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* [Where filter](https://docs.strongloop.com/display/LB/Where+filter#Wherefilter-Whereclauseforothermethods).
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* @callback {Function} callback Callback function called with `(err, count)` arguments. Required.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Number} count Number of instances updated.
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*/
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PersistedModel.count = function(where, cb) {
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throwNotAttached(this.modelName, 'count');
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};
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/**
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* Save model instance. If the instance doesn't have an ID, then calls [create](#persistedmodelcreatedata-cb) instead.
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* Triggers: validate, save, update, or create.
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* @options {Object} [options] See below.
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* @property {Boolean} validate Perform validation before saving. Default is true.
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* @property {Boolean} throws If true, throw a validation error; WARNING: This can crash Node.
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* If false, report the error via callback. Default is false.
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* @callback {Function} callback Optional callback function called with `(err, obj)` arguments.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Object} instance Model instance saved or created.
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*/
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PersistedModel.prototype.save = function(options, callback) {
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var Model = this.constructor;
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if (typeof options == 'function') {
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callback = options;
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options = {};
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}
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callback = callback || function() {
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};
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options = options || {};
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if (!('validate' in options)) {
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options.validate = true;
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}
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if (!('throws' in options)) {
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options.throws = false;
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}
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var inst = this;
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var data = inst.toObject(true);
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var id = this.getId();
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if (!id) {
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return Model.create(this, callback);
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}
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// validate first
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if (!options.validate) {
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return save();
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}
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inst.isValid(function(valid) {
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if (valid) {
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save();
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} else {
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var err = new Model.ValidationError(inst);
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// throws option is dangerous for async usage
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if (options.throws) {
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throw err;
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}
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callback(err, inst);
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}
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});
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// then save
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function save() {
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inst.trigger('save', function(saveDone) {
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inst.trigger('update', function(updateDone) {
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Model.upsert(inst, function(err) {
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inst._initProperties(data);
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updateDone.call(inst, function() {
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saveDone.call(inst, function() {
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callback(err, inst);
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});
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});
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});
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}, data);
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}, data);
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}
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};
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/**
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* Determine if the data model is new.
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* @returns {Boolean} Returns true if the data model is new; false otherwise.
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*/
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PersistedModel.prototype.isNewRecord = function() {
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throwNotAttached(this.constructor.modelName, 'isNewRecord');
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};
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/**
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* Deletes the model from persistence.
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* Triggers `destroy` hook (async) before and after destroying object.
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* @param {Function} callback Callback function.
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*/
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PersistedModel.prototype.destroy = function(cb) {
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throwNotAttached(this.constructor.modelName, 'destroy');
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};
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/**
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* Alias for destroy.
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* @header PersistedModel.remove
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*/
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PersistedModel.prototype.remove = PersistedModel.prototype.destroy;
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/**
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* Alias for destroy.
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* @header PersistedModel.delete
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*/
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PersistedModel.prototype.delete = PersistedModel.prototype.destroy;
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PersistedModel.prototype.destroy._delegate = true;
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/**
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* Update a single attribute.
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* Equivalent to `updateAttributes({name: 'value'}, cb)`
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*
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* @param {String} name Name of property.
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* @param {Mixed} value Value of property.
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* @callback {Function} callback Callback function called with `(err, instance)` arguments. Required.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Object} instance Updated instance.
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*/
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PersistedModel.prototype.updateAttribute = function updateAttribute(name, value, callback) {
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throwNotAttached(this.constructor.modelName, 'updateAttribute');
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};
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/**
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* Update set of attributes. Performs validation before updating.
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*
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* Triggers: `validation`, `save` and `update` hooks
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* @param {Object} data Data to update.
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* @callback {Function} callback Callback function called with `(err, instance)` arguments. Required.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Object} instance Updated instance.
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*/
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PersistedModel.prototype.updateAttributes = function updateAttributes(data, cb) {
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throwNotAttached(this.modelName, 'updateAttributes');
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};
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/**
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* Reload object from persistence. Requires `id` member of `object` to be able to call `find`.
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* @callback {Function} callback Callback function called with `(err, instance)` arguments. Required.
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* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
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* @param {Object} instance Model instance.
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*/
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PersistedModel.prototype.reload = function reload(callback) {
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throwNotAttached(this.constructor.modelName, 'reload');
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};
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/**
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* Set the correct `id` property for the `PersistedModel`. Uses the `setId` method if the model is attached to
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* connector that defines it. Otherwise, uses the default lookup.
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* Override this method to handle complex IDs.
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*
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* @param {*} val The `id` value. Will be converted to the type that the `id` property specifies.
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*/
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PersistedModel.prototype.setId = function(val) {
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var ds = this.getDataSource();
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this[this.getIdName()] = val;
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};
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/**
|
|
* Get the `id` value for the `PersistedModel`.
|
|
*
|
|
* @returns {*} The `id` value
|
|
*/
|
|
|
|
PersistedModel.prototype.getId = function() {
|
|
var data = this.toObject();
|
|
if (!data) return;
|
|
return data[this.getIdName()];
|
|
};
|
|
|
|
/**
|
|
* Get the `id` property name of the constructor.
|
|
*
|
|
* @returns {String} The `id` property name
|
|
*/
|
|
|
|
PersistedModel.prototype.getIdName = function() {
|
|
return this.constructor.getIdName();
|
|
};
|
|
|
|
/**
|
|
* Get the `id` property name of the constructor.
|
|
*
|
|
* @returns {String} The `id` property name
|
|
*/
|
|
|
|
PersistedModel.getIdName = function() {
|
|
var Model = this;
|
|
var ds = Model.getDataSource();
|
|
|
|
if (ds.idName) {
|
|
return ds.idName(Model.modelName);
|
|
} else {
|
|
return 'id';
|
|
}
|
|
};
|
|
|
|
PersistedModel.setupRemoting = function() {
|
|
var PersistedModel = this;
|
|
var typeName = PersistedModel.modelName;
|
|
var options = PersistedModel.settings;
|
|
|
|
function setRemoting(scope, name, options) {
|
|
var fn = scope[name];
|
|
fn._delegate = true;
|
|
options.isStatic = scope === PersistedModel;
|
|
PersistedModel.remoteMethod(name, options);
|
|
}
|
|
|
|
setRemoting(PersistedModel, 'create', {
|
|
description: 'Create a new instance of the model and persist it into the data source.',
|
|
accessType: 'WRITE',
|
|
accepts: {arg: 'data', type: 'object', description: 'Model instance data', http: {source: 'body'}},
|
|
returns: {arg: 'data', type: typeName, root: true},
|
|
http: {verb: 'post', path: '/'}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'upsert', {
|
|
aliases: ['updateOrCreate'],
|
|
description: 'Update an existing model instance or insert a new one into the data source.',
|
|
accessType: 'WRITE',
|
|
accepts: {arg: 'data', type: 'object', description: 'Model instance data', http: {source: 'body'}},
|
|
returns: {arg: 'data', type: typeName, root: true},
|
|
http: {verb: 'put', path: '/'}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'exists', {
|
|
description: 'Check whether a model instance exists in the data source.',
|
|
accessType: 'READ',
|
|
accepts: {arg: 'id', type: 'any', description: 'Model id', required: true},
|
|
returns: {arg: 'exists', type: 'boolean'},
|
|
http: [
|
|
{verb: 'get', path: '/:id/exists'},
|
|
{verb: 'head', path: '/:id'}
|
|
],
|
|
rest: {
|
|
// After hook to map exists to 200/404 for HEAD
|
|
after: function(ctx, cb) {
|
|
if (ctx.req.method === 'GET') {
|
|
// For GET, return {exists: true|false} as is
|
|
return cb();
|
|
}
|
|
if (!ctx.result.exists) {
|
|
var modelName = ctx.method.sharedClass.name;
|
|
var id = ctx.getArgByName('id');
|
|
var msg = 'Unknown "' + modelName + '" id "' + id + '".';
|
|
var error = new Error(msg);
|
|
error.statusCode = error.status = 404;
|
|
error.code = 'MODEL_NOT_FOUND';
|
|
cb(error);
|
|
} else {
|
|
cb();
|
|
}
|
|
}
|
|
}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'findById', {
|
|
description: 'Find a model instance by id from the data source.',
|
|
accessType: 'READ',
|
|
accepts: [
|
|
{ arg: 'id', type: 'any', description: 'Model id', required: true,
|
|
http: {source: 'path'}},
|
|
{ arg: 'filter', type: 'object',
|
|
description: 'Filter defining fields and include'}
|
|
],
|
|
returns: {arg: 'data', type: typeName, root: true},
|
|
http: {verb: 'get', path: '/:id'},
|
|
rest: {after: convertNullToNotFoundError}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'find', {
|
|
description: 'Find all instances of the model matched by filter from the data source.',
|
|
accessType: 'READ',
|
|
accepts: {arg: 'filter', type: 'object', description: 'Filter defining fields, where, include, order, offset, and limit'},
|
|
returns: {arg: 'data', type: [typeName], root: true},
|
|
http: {verb: 'get', path: '/'}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'findOne', {
|
|
description: 'Find first instance of the model matched by filter from the data source.',
|
|
accessType: 'READ',
|
|
accepts: {arg: 'filter', type: 'object', description: 'Filter defining fields, where, include, order, offset, and limit'},
|
|
returns: {arg: 'data', type: typeName, root: true},
|
|
http: {verb: 'get', path: '/findOne'},
|
|
rest: {after: convertNullToNotFoundError}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'destroyAll', {
|
|
description: 'Delete all matching records.',
|
|
accessType: 'WRITE',
|
|
accepts: {arg: 'where', type: 'object', description: 'filter.where object'},
|
|
returns: {
|
|
arg: 'count',
|
|
type: 'object',
|
|
description: 'The number of instances deleted',
|
|
root: true
|
|
},
|
|
http: {verb: 'del', path: '/'},
|
|
shared: false
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'updateAll', {
|
|
aliases: ['update'],
|
|
description: 'Update instances of the model matched by where from the data source.',
|
|
accessType: 'WRITE',
|
|
accepts: [
|
|
{arg: 'where', type: 'object', http: {source: 'query'},
|
|
description: 'Criteria to match model instances'},
|
|
{arg: 'data', type: 'object', http: {source: 'body'},
|
|
description: 'An object of model property name/value pairs'},
|
|
],
|
|
returns: {
|
|
arg: 'count',
|
|
description: 'The number of instances updated',
|
|
type: 'object',
|
|
root: true
|
|
},
|
|
http: {verb: 'post', path: '/update'}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'deleteById', {
|
|
aliases: ['destroyById', 'removeById'],
|
|
description: 'Delete a model instance by id from the data source.',
|
|
accessType: 'WRITE',
|
|
accepts: {arg: 'id', type: 'any', description: 'Model id', required: true,
|
|
http: {source: 'path'}},
|
|
http: {verb: 'del', path: '/:id'},
|
|
returns: {arg: 'count', type: 'object', root: true}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'count', {
|
|
description: 'Count instances of the model matched by where from the data source.',
|
|
accessType: 'READ',
|
|
accepts: {arg: 'where', type: 'object', description: 'Criteria to match model instances'},
|
|
returns: {arg: 'count', type: 'number'},
|
|
http: {verb: 'get', path: '/count'}
|
|
});
|
|
|
|
setRemoting(PersistedModel.prototype, 'updateAttributes', {
|
|
description: 'Update attributes for a model instance and persist it into the data source.',
|
|
accessType: 'WRITE',
|
|
accepts: {arg: 'data', type: 'object', http: {source: 'body'}, description: 'An object of model property name/value pairs'},
|
|
returns: {arg: 'data', type: typeName, root: true},
|
|
http: {verb: 'put', path: '/'}
|
|
});
|
|
|
|
if (options.trackChanges || options.enableRemoteReplication) {
|
|
setRemoting(PersistedModel, 'diff', {
|
|
description: 'Get a set of deltas and conflicts since the given checkpoint.',
|
|
accessType: 'READ',
|
|
accepts: [
|
|
{arg: 'since', type: 'number', description: 'Find deltas since this checkpoint'},
|
|
{arg: 'remoteChanges', type: 'array', description: 'an array of change objects',
|
|
http: {source: 'body'}}
|
|
],
|
|
returns: {arg: 'result', type: 'object', root: true},
|
|
http: {verb: 'post', path: '/diff'}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'changes', {
|
|
description: 'Get the changes to a model since a given checkpoint.' +
|
|
'Provide a filter object to reduce the number of results returned.',
|
|
accessType: 'READ',
|
|
accepts: [
|
|
{arg: 'since', type: 'number', description: 'Only return changes since this checkpoint'},
|
|
{arg: 'filter', type: 'object', description: 'Only include changes that match this filter'}
|
|
],
|
|
returns: {arg: 'changes', type: 'array', root: true},
|
|
http: {verb: 'get', path: '/changes'}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'checkpoint', {
|
|
description: 'Create a checkpoint.',
|
|
// The replication algorithm needs to create a source checkpoint,
|
|
// even though it is otherwise not making any source changes.
|
|
// We need to allow this method for users that don't have full
|
|
// WRITE permissions.
|
|
accessType: 'REPLICATE',
|
|
returns: {arg: 'checkpoint', type: 'object', root: true},
|
|
http: {verb: 'post', path: '/checkpoint'}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'currentCheckpoint', {
|
|
description: 'Get the current checkpoint.',
|
|
accessType: 'READ',
|
|
returns: {arg: 'checkpoint', type: 'object', root: true},
|
|
http: {verb: 'get', path: '/checkpoint'}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'createUpdates', {
|
|
description: 'Create an update list from a delta list.',
|
|
// This operation is read-only, it does not change any local data.
|
|
// It is called by the replication algorithm to compile a list
|
|
// of changes to apply on the target.
|
|
accessType: 'READ',
|
|
accepts: {arg: 'deltas', type: 'array', http: {source: 'body'}},
|
|
returns: {arg: 'updates', type: 'array', root: true},
|
|
http: {verb: 'post', path: '/create-updates'}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'bulkUpdate', {
|
|
description: 'Run multiple updates at once. Note: this is not atomic.',
|
|
accessType: 'WRITE',
|
|
accepts: {arg: 'updates', type: 'array'},
|
|
http: {verb: 'post', path: '/bulk-update'}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'findLastChange', {
|
|
description: 'Get the most recent change record for this instance.',
|
|
accessType: 'READ',
|
|
accepts: {
|
|
arg: 'id', type: 'any', required: true, http: { source: 'path' },
|
|
description: 'Model id'
|
|
},
|
|
returns: { arg: 'result', type: this.Change.modelName, root: true },
|
|
http: { verb: 'get', path: '/:id/changes/last' }
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'updateLastChange', {
|
|
description: [
|
|
'Update the properties of the most recent change record',
|
|
'kept for this instance.'
|
|
],
|
|
accessType: 'WRITE',
|
|
accepts: [
|
|
{
|
|
arg: 'id', type: 'any', required: true, http: { source: 'path' },
|
|
description: 'Model id'
|
|
},
|
|
{
|
|
arg: 'data', type: 'object', http: {source: 'body'},
|
|
description: 'An object of Change property name/value pairs'
|
|
},
|
|
],
|
|
returns: { arg: 'result', type: this.Change.modelName, root: true },
|
|
http: { verb: 'put', path: '/:id/changes/last' }
|
|
});
|
|
}
|
|
|
|
if (options.trackChanges) {
|
|
// Deprecated (legacy) exports kept for backwards compatibility
|
|
// TODO(bajtos) Hide these two exports in LoopBack 3.0
|
|
setRemoting(PersistedModel, 'rectifyAllChanges', {
|
|
description: 'Rectify all Model changes.',
|
|
accessType: 'WRITE',
|
|
http: {verb: 'post', path: '/rectify-all'}
|
|
});
|
|
|
|
setRemoting(PersistedModel, 'rectifyChange', {
|
|
description: 'Tell loopback that a change to the model with the given id has occurred.',
|
|
accessType: 'WRITE',
|
|
accepts: {arg: 'id', type: 'any', http: {source: 'path'}},
|
|
http: {verb: 'post', path: '/:id/rectify-change'}
|
|
});
|
|
}
|
|
|
|
setRemoting(PersistedModel, 'createChangeStream', {
|
|
description: 'Create a change stream.',
|
|
accessType: 'READ',
|
|
http: [
|
|
{verb: 'post', path: '/change-stream'},
|
|
{verb: 'get', path: '/change-stream'}
|
|
],
|
|
accepts: {
|
|
arg: 'options',
|
|
type: 'object'
|
|
},
|
|
returns: {
|
|
arg: 'changes',
|
|
type: 'ReadableStream',
|
|
json: true
|
|
}
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Get a set of deltas and conflicts since the given checkpoint.
|
|
*
|
|
* See [Change.diff()](#change-diff) for details.
|
|
*
|
|
* @param {Number} since Find deltas since this checkpoint.
|
|
* @param {Array} remoteChanges An array of change objects.
|
|
* @callback {Function} callback Callback function called with `(err, result)` arguments. Required.
|
|
* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
|
|
* @param {Object} result Object with `deltas` and `conflicts` properties; see [Change.diff()](#change-diff) for details.
|
|
*/
|
|
|
|
PersistedModel.diff = function(since, remoteChanges, callback) {
|
|
var Change = this.getChangeModel();
|
|
Change.diff(this.modelName, since, remoteChanges, callback);
|
|
};
|
|
|
|
/**
|
|
* Get the changes to a model since the specified checkpoint. Provide a filter object
|
|
* to reduce the number of results returned.
|
|
* @param {Number} since Return only changes since this checkpoint.
|
|
* @param {Object} filter Include only changes that match this filter, the same as for [#persistedmodel-find](find()).
|
|
* @callback {Function} callback Callback function called with `(err, changes)` arguments. Required.
|
|
* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
|
|
* @param {Array} changes An array of [Change](#change) objects.
|
|
*/
|
|
|
|
PersistedModel.changes = function(since, filter, callback) {
|
|
if (typeof since === 'function') {
|
|
filter = {};
|
|
callback = since;
|
|
since = -1;
|
|
}
|
|
if (typeof filter === 'function') {
|
|
callback = filter;
|
|
since = -1;
|
|
filter = {};
|
|
}
|
|
|
|
var idName = this.dataSource.idName(this.modelName);
|
|
var Change = this.getChangeModel();
|
|
var model = this;
|
|
|
|
filter = filter || {};
|
|
filter.fields = {};
|
|
filter.where = filter.where || {};
|
|
filter.fields[idName] = true;
|
|
|
|
// TODO(ritch) this whole thing could be optimized a bit more
|
|
Change.find({ where: {
|
|
checkpoint: { gte: since },
|
|
modelName: this.modelName
|
|
}}, function(err, changes) {
|
|
if (err) return callback(err);
|
|
if (!Array.isArray(changes) || changes.length === 0) return callback(null, []);
|
|
var ids = changes.map(function(change) {
|
|
return change.getModelId();
|
|
});
|
|
filter.where[idName] = {inq: ids};
|
|
model.find(filter, function(err, models) {
|
|
if (err) return callback(err);
|
|
var modelIds = models.map(function(m) {
|
|
return m[idName].toString();
|
|
});
|
|
callback(null, changes.filter(function(ch) {
|
|
if (ch.type() === Change.DELETE) return true;
|
|
return modelIds.indexOf(ch.modelId) > -1;
|
|
}));
|
|
});
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Create a checkpoint.
|
|
*
|
|
* @param {Function} callback
|
|
*/
|
|
|
|
PersistedModel.checkpoint = function(cb) {
|
|
var Checkpoint = this.getChangeModel().getCheckpointModel();
|
|
this.getSourceId(function(err, sourceId) {
|
|
if (err) return cb(err);
|
|
Checkpoint.create({
|
|
sourceId: sourceId
|
|
}, cb);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Get the current checkpoint ID.
|
|
*
|
|
* @callback {Function} callback Callback function called with `(err, currentCheckpointId)` arguments. Required.
|
|
* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
|
|
* @param {Number} currentCheckpointId Current checkpoint ID.
|
|
*/
|
|
|
|
PersistedModel.currentCheckpoint = function(cb) {
|
|
var Checkpoint = this.getChangeModel().getCheckpointModel();
|
|
Checkpoint.current(cb);
|
|
};
|
|
|
|
/**
|
|
* Replicate changes since the given checkpoint to the given target model.
|
|
*
|
|
* @param {Number} [since] Since this checkpoint
|
|
* @param {Model} targetModel Target this model class
|
|
* @param {Object} [options]
|
|
* @param {Object} [options.filter] Replicate models that match this filter
|
|
* @callback {Function} [callback] Callback function called with `(err, conflicts)` arguments.
|
|
* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
|
|
* @param {Conflict[]} conflicts A list of changes that could not be replicated due to conflicts.
|
|
* @param {Object] checkpoints The new checkpoints to use as the "since"
|
|
* argument for the next replication.
|
|
*/
|
|
|
|
PersistedModel.replicate = function(since, targetModel, options, callback) {
|
|
var lastArg = arguments[arguments.length - 1];
|
|
|
|
if (typeof lastArg === 'function' && arguments.length > 1) {
|
|
callback = lastArg;
|
|
}
|
|
|
|
if (typeof since === 'function' && since.modelName) {
|
|
targetModel = since;
|
|
since = -1;
|
|
}
|
|
|
|
if (typeof since !== 'object') {
|
|
since = { source: since, target: since };
|
|
}
|
|
|
|
options = options || {};
|
|
|
|
var sourceModel = this;
|
|
callback = callback || utils.createPromiseCallback();
|
|
|
|
debug('replicating %s since %s to %s since %s',
|
|
sourceModel.modelName,
|
|
since.source,
|
|
targetModel.modelName,
|
|
since.target);
|
|
if (options.filter) {
|
|
debug('\twith filter %j', options.filter);
|
|
}
|
|
|
|
// In order to avoid a race condition between the replication and
|
|
// other clients modifying the data, we must create the new target
|
|
// checkpoint as the first step of the replication process.
|
|
// As a side-effect of that, the replicated changes are associated
|
|
// with the new target checkpoint. This is actually desired behaviour,
|
|
// because that way clients replicating *from* the target model
|
|
// since the new checkpoint will pick these changes up.
|
|
// However, it increases the likelihood of (false) conflicts being detected.
|
|
// In order to prevent that, we run the replication multiple times,
|
|
// until no changes were replicated, but at most MAX_ATTEMPTS times
|
|
// to prevent starvation. In most cases, the second run will find no changes
|
|
// to replicate and we are done.
|
|
var MAX_ATTEMPTS = 3;
|
|
|
|
run(1, since);
|
|
return callback.promise;
|
|
|
|
function run(attempt, since) {
|
|
debug('\titeration #%s', attempt);
|
|
tryReplicate(sourceModel, targetModel, since, options, next);
|
|
|
|
function next(err, conflicts, cps, updates) {
|
|
var finished = err || conflicts.length ||
|
|
!updates || updates.length === 0 ||
|
|
attempt >= MAX_ATTEMPTS;
|
|
|
|
if (finished)
|
|
return callback(err, conflicts, cps);
|
|
run(attempt + 1, cps);
|
|
}
|
|
}
|
|
};
|
|
|
|
function tryReplicate(sourceModel, targetModel, since, options, callback) {
|
|
var Change = sourceModel.getChangeModel();
|
|
var TargetChange = targetModel.getChangeModel();
|
|
var changeTrackingEnabled = Change && TargetChange;
|
|
|
|
assert(
|
|
changeTrackingEnabled,
|
|
'You must enable change tracking before replicating'
|
|
);
|
|
|
|
var diff;
|
|
var updates;
|
|
var newSourceCp, newTargetCp;
|
|
|
|
var tasks = [
|
|
checkpoints,
|
|
getSourceChanges,
|
|
getDiffFromTarget,
|
|
createSourceUpdates,
|
|
bulkUpdate
|
|
];
|
|
|
|
async.waterfall(tasks, done);
|
|
|
|
function getSourceChanges(cb) {
|
|
sourceModel.changes(since.source, options.filter, debug.enabled ? log : cb);
|
|
|
|
function log(err, result) {
|
|
if (err) return cb(err);
|
|
debug('\tusing source changes');
|
|
result.forEach(function(it) { debug('\t\t%j', it); });
|
|
cb(err, result);
|
|
}
|
|
}
|
|
|
|
function getDiffFromTarget(sourceChanges, cb) {
|
|
targetModel.diff(since.target, sourceChanges, debug.enabled ? log : cb);
|
|
|
|
function log(err, result) {
|
|
if (err) return cb(err);
|
|
if (result.conflicts && result.conflicts.length) {
|
|
debug('\tdiff conflicts');
|
|
result.conflicts.forEach(function(d) { debug('\t\t%j', d); });
|
|
}
|
|
if (result.deltas && result.deltas.length) {
|
|
debug('\tdiff deltas');
|
|
result.deltas.forEach(function(it) { debug('\t\t%j', it); });
|
|
}
|
|
cb(err, result);
|
|
}
|
|
}
|
|
|
|
function createSourceUpdates(_diff, cb) {
|
|
diff = _diff;
|
|
diff.conflicts = diff.conflicts || [];
|
|
if (diff && diff.deltas && diff.deltas.length) {
|
|
debug('\tbuilding a list of updates');
|
|
sourceModel.createUpdates(diff.deltas, cb);
|
|
} else {
|
|
// nothing to replicate
|
|
done();
|
|
}
|
|
}
|
|
|
|
function bulkUpdate(_updates, cb) {
|
|
debug('\tstarting bulk update');
|
|
updates = _updates;
|
|
targetModel.bulkUpdate(updates, function(err) {
|
|
var conflicts = err && err.details && err.details.conflicts;
|
|
if (conflicts && err.statusCode == 409) {
|
|
diff.conflicts = conflicts;
|
|
// filter out updates that were not applied
|
|
updates = updates.filter(function(u) {
|
|
return conflicts
|
|
.filter(function(d) { return d.modelId === u.change.modelId; })
|
|
.length === 0;
|
|
});
|
|
return cb();
|
|
}
|
|
cb(err);
|
|
});
|
|
}
|
|
|
|
function checkpoints() {
|
|
var cb = arguments[arguments.length - 1];
|
|
sourceModel.checkpoint(function(err, source) {
|
|
if (err) return cb(err);
|
|
newSourceCp = source.seq;
|
|
targetModel.checkpoint(function(err, target) {
|
|
if (err) return cb(err);
|
|
newTargetCp = target.seq;
|
|
debug('\tcreated checkpoints');
|
|
debug('\t\t%s for source model %s', newSourceCp, sourceModel.modelName);
|
|
debug('\t\t%s for target model %s', newTargetCp, targetModel.modelName);
|
|
cb();
|
|
});
|
|
});
|
|
}
|
|
|
|
function done(err) {
|
|
if (err) return callback(err);
|
|
|
|
debug('\treplication finished');
|
|
debug('\t\t%s conflict(s) detected', diff.conflicts.length);
|
|
debug('\t\t%s change(s) applied', updates ? updates.length : 0);
|
|
debug('\t\tnew checkpoints: { source: %j, target: %j }',
|
|
newSourceCp, newTargetCp);
|
|
|
|
var conflicts = diff.conflicts.map(function(change) {
|
|
return new Change.Conflict(
|
|
change.modelId, sourceModel, targetModel
|
|
);
|
|
});
|
|
|
|
if (conflicts.length) {
|
|
sourceModel.emit('conflicts', conflicts);
|
|
}
|
|
|
|
if (callback) {
|
|
var newCheckpoints = { source: newSourceCp, target: newTargetCp };
|
|
callback(null, conflicts, newCheckpoints, updates);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Create an update list (for `Model.bulkUpdate()`) from a delta list
|
|
* (result of `Change.diff()`).
|
|
*
|
|
* @param {Array} deltas
|
|
* @param {Function} callback
|
|
*/
|
|
|
|
PersistedModel.createUpdates = function(deltas, cb) {
|
|
var Change = this.getChangeModel();
|
|
var updates = [];
|
|
var Model = this;
|
|
var tasks = [];
|
|
|
|
deltas.forEach(function(change) {
|
|
change = new Change(change);
|
|
var type = change.type();
|
|
var update = {type: type, change: change};
|
|
switch (type) {
|
|
case Change.CREATE:
|
|
case Change.UPDATE:
|
|
tasks.push(function(cb) {
|
|
Model.findById(change.modelId, function(err, inst) {
|
|
if (err) return cb(err);
|
|
if (!inst) {
|
|
return cb &&
|
|
cb(new Error('Missing data for change: ' + change.modelId));
|
|
}
|
|
if (inst.toObject) {
|
|
update.data = inst.toObject();
|
|
} else {
|
|
update.data = inst;
|
|
}
|
|
updates.push(update);
|
|
cb();
|
|
});
|
|
});
|
|
break;
|
|
case Change.DELETE:
|
|
updates.push(update);
|
|
break;
|
|
}
|
|
});
|
|
|
|
async.parallel(tasks, function(err) {
|
|
if (err) return cb(err);
|
|
cb(null, updates);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Apply an update list.
|
|
*
|
|
* **Note: this is not atomic**
|
|
*
|
|
* @param {Array} updates An updates list, usually from [createUpdates()](#persistedmodel-createupdates).
|
|
* @param {Function} callback Callback function.
|
|
*/
|
|
|
|
PersistedModel.bulkUpdate = function(updates, callback) {
|
|
var tasks = [];
|
|
var Model = this;
|
|
var Change = this.getChangeModel();
|
|
var conflicts = [];
|
|
|
|
buildLookupOfAffectedModelData(Model, updates, function(err, currentMap) {
|
|
if (err) return callback(err);
|
|
|
|
updates.forEach(function(update) {
|
|
var id = update.change.modelId;
|
|
var current = currentMap[id];
|
|
switch (update.type) {
|
|
case Change.UPDATE:
|
|
tasks.push(function(cb) {
|
|
applyUpdate(Model, id, current, update.data, update.change, conflicts, cb);
|
|
});
|
|
break;
|
|
|
|
case Change.CREATE:
|
|
tasks.push(function(cb) {
|
|
applyCreate(Model, id, current, update.data, update.change, conflicts, cb);
|
|
});
|
|
break;
|
|
case Change.DELETE:
|
|
tasks.push(function(cb) {
|
|
applyDelete(Model, id, current, update.change, conflicts, cb);
|
|
});
|
|
break;
|
|
}
|
|
});
|
|
|
|
async.parallel(tasks, function(err) {
|
|
if (err) return callback(err);
|
|
if (conflicts.length) {
|
|
err = new Error('Conflict');
|
|
err.statusCode = 409;
|
|
err.details = { conflicts: conflicts };
|
|
return callback(err);
|
|
}
|
|
callback();
|
|
});
|
|
});
|
|
};
|
|
|
|
function buildLookupOfAffectedModelData(Model, updates, callback) {
|
|
var idName = Model.dataSource.idName(Model.modelName);
|
|
var affectedIds = updates.map(function(u) { return u.change.modelId; });
|
|
var whereAffected = {};
|
|
whereAffected[idName] = { inq: affectedIds };
|
|
Model.find({ where: whereAffected }, function(err, affectedList) {
|
|
if (err) return callback(err);
|
|
var dataLookup = {};
|
|
affectedList.forEach(function(it) {
|
|
dataLookup[it[idName]] = it;
|
|
});
|
|
callback(null, dataLookup);
|
|
});
|
|
}
|
|
|
|
function applyUpdate(Model, id, current, data, change, conflicts, cb) {
|
|
var Change = Model.getChangeModel();
|
|
var rev = current ? Change.revisionForInst(current) : null;
|
|
|
|
if (rev !== change.prev) {
|
|
debug('Detected non-rectified change of %s %j',
|
|
Model.modelName, id);
|
|
debug('\tExpected revision: %s', change.rev);
|
|
debug('\tActual revision: %s', rev);
|
|
conflicts.push(change);
|
|
return Change.rectifyModelChanges(Model.modelName, [id], cb);
|
|
}
|
|
|
|
// TODO(bajtos) modify `data` so that it instructs
|
|
// the connector to remove any properties included in "inst"
|
|
// but not included in `data`
|
|
// See https://github.com/strongloop/loopback/issues/1215
|
|
|
|
Model.updateAll(current.toObject(), data, function(err, result) {
|
|
if (err) return cb(err);
|
|
|
|
var count = result && result.count;
|
|
switch (count) {
|
|
case 1:
|
|
// The happy path, exactly one record was updated
|
|
return cb();
|
|
|
|
case 0:
|
|
debug('UpdateAll detected non-rectified change of %s %j',
|
|
Model.modelName, id);
|
|
conflicts.push(change);
|
|
// NOTE(bajtos) updateAll triggers change rectification
|
|
// for all model instances, even when no records were updated,
|
|
// thus we don't need to rectify explicitly ourselves
|
|
return cb();
|
|
|
|
case undefined:
|
|
case null:
|
|
return cb(new Error(
|
|
'Cannot apply bulk updates, ' +
|
|
'the connector does not correctly report ' +
|
|
'the number of updated records.'));
|
|
|
|
default:
|
|
debug('%s.updateAll modified unexpected number of instances: %j',
|
|
Model.modelName, count);
|
|
return cb(new Error(
|
|
'Bulk update failed, the connector has modified unexpected ' +
|
|
'number of records: ' + JSON.stringify(count)));
|
|
}
|
|
});
|
|
}
|
|
|
|
function applyCreate(Model, id, current, data, change, conflicts, cb) {
|
|
Model.create(data, function(createErr) {
|
|
if (!createErr) return cb();
|
|
|
|
// We don't have a reliable way how to detect the situation
|
|
// where he model was not create because of a duplicate id
|
|
// The workaround is to query the DB to check if the model already exists
|
|
Model.findById(id, function(findErr, inst) {
|
|
if (findErr || !inst) {
|
|
// There isn't any instance with the same id, thus there isn't
|
|
// any conflict and we just report back the original error.
|
|
return cb(createErr);
|
|
}
|
|
|
|
return conflict();
|
|
});
|
|
});
|
|
|
|
function conflict() {
|
|
// The instance already exists - report a conflict
|
|
debug('Detected non-rectified new instance of %s %j',
|
|
Model.modelName, id);
|
|
conflicts.push(change);
|
|
|
|
var Change = Model.getChangeModel();
|
|
return Change.rectifyModelChanges(Model.modelName, [id], cb);
|
|
}
|
|
}
|
|
|
|
function applyDelete(Model, id, current, change, conflicts, cb) {
|
|
if (!current) {
|
|
// The instance was either already deleted or not created at all,
|
|
// we are done.
|
|
return cb();
|
|
}
|
|
|
|
var Change = Model.getChangeModel();
|
|
var rev = Change.revisionForInst(current);
|
|
if (rev !== change.prev) {
|
|
debug('Detected non-rectified change of %s %j',
|
|
Model.modelName, id);
|
|
debug('\tExpected revision: %s', change.rev);
|
|
debug('\tActual revision: %s', rev);
|
|
conflicts.push(change);
|
|
return Change.rectifyModelChanges(Model.modelName, [id], cb);
|
|
}
|
|
|
|
Model.deleteAll(current.toObject(), function(err, result) {
|
|
if (err) return cb(err);
|
|
|
|
var count = result && result.count;
|
|
switch (count) {
|
|
case 1:
|
|
// The happy path, exactly one record was updated
|
|
return cb();
|
|
|
|
case 0:
|
|
debug('DeleteAll detected non-rectified change of %s %j',
|
|
Model.modelName, id);
|
|
conflicts.push(change);
|
|
// NOTE(bajtos) deleteAll triggers change rectification
|
|
// for all model instances, even when no records were updated,
|
|
// thus we don't need to rectify explicitly ourselves
|
|
return cb();
|
|
|
|
case undefined:
|
|
case null:
|
|
return cb(new Error(
|
|
'Cannot apply bulk updates, ' +
|
|
'the connector does not correctly report ' +
|
|
'the number of deleted records.'));
|
|
|
|
default:
|
|
debug('%s.deleteAll modified unexpected number of instances: %j',
|
|
Model.modelName, count);
|
|
return cb(new Error(
|
|
'Bulk update failed, the connector has deleted unexpected ' +
|
|
'number of records: ' + JSON.stringify(count)));
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Get the `Change` model.
|
|
* Throws an error if the change model is not correctly setup.
|
|
* @return {Change}
|
|
*/
|
|
|
|
PersistedModel.getChangeModel = function() {
|
|
var changeModel = this.Change;
|
|
var isSetup = changeModel && changeModel.dataSource;
|
|
|
|
assert(isSetup, 'Cannot get a setup Change model for ' + this.modelName);
|
|
|
|
return changeModel;
|
|
};
|
|
|
|
/**
|
|
* Get the source identifier for this model or dataSource.
|
|
*
|
|
* @callback {Function} callback Callback function called with `(err, id)` arguments.
|
|
* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
|
|
* @param {String} sourceId Source identifier for the model or dataSource.
|
|
*/
|
|
|
|
PersistedModel.getSourceId = function(cb) {
|
|
var dataSource = this.dataSource;
|
|
if (!dataSource) {
|
|
this.once('dataSourceAttached', this.getSourceId.bind(this, cb));
|
|
}
|
|
assert(
|
|
dataSource.connector.name,
|
|
'Model.getSourceId: cannot get id without dataSource.connector.name'
|
|
);
|
|
var id = [dataSource.connector.name, this.modelName].join('-');
|
|
cb(null, id);
|
|
};
|
|
|
|
/**
|
|
* Enable the tracking of changes made to the model. Usually for replication.
|
|
*/
|
|
|
|
PersistedModel.enableChangeTracking = function() {
|
|
var Model = this;
|
|
var Change = this.Change || this._defineChangeModel();
|
|
var cleanupInterval = Model.settings.changeCleanupInterval || 30000;
|
|
|
|
assert(this.dataSource, 'Cannot enableChangeTracking(): ' + this.modelName +
|
|
' is not attached to a dataSource');
|
|
|
|
var idName = this.getIdName();
|
|
var idProp = this.definition.properties[idName];
|
|
var idType = idProp && idProp.type;
|
|
var idDefn = idProp && idProp.defaultFn;
|
|
if (idType !== String || !(idDefn === 'uuid' || idDefn === 'guid')) {
|
|
deprecated('The model ' + this.modelName + ' is tracking changes, ' +
|
|
'which requries a string id with GUID/UUID default value.');
|
|
}
|
|
|
|
Model.observe('after save', rectifyOnSave);
|
|
|
|
Model.observe('after delete', rectifyOnDelete);
|
|
|
|
if (runtime.isServer) {
|
|
// initial cleanup
|
|
cleanup();
|
|
|
|
// cleanup
|
|
setInterval(cleanup, cleanupInterval);
|
|
}
|
|
|
|
function cleanup() {
|
|
Model.rectifyAllChanges(function(err) {
|
|
if (err) {
|
|
Model.handleChangeError(err, 'cleanup');
|
|
}
|
|
});
|
|
}
|
|
};
|
|
|
|
function rectifyOnSave(ctx, next) {
|
|
var instance = ctx.instance || ctx.currentInstance;
|
|
var id = instance ? instance.getId() :
|
|
getIdFromWhereByModelId(ctx.Model, ctx.where);
|
|
|
|
if (debug.enabled) {
|
|
debug('rectifyOnSave %s -> ' + (id ? 'id %j' : '%s'),
|
|
ctx.Model.modelName, id ? id : 'ALL');
|
|
debug('context instance:%j currentInstance:%j where:%j data %j',
|
|
ctx.instance, ctx.currentInstance, ctx.where, ctx.data);
|
|
}
|
|
|
|
if (id) {
|
|
ctx.Model.rectifyChange(id, reportErrorAndNext);
|
|
} else {
|
|
ctx.Model.rectifyAllChanges(reportErrorAndNext);
|
|
}
|
|
|
|
function reportErrorAndNext(err) {
|
|
if (err) {
|
|
ctx.Model.handleChangeError(err, 'after save');
|
|
}
|
|
next();
|
|
}
|
|
}
|
|
|
|
function rectifyOnDelete(ctx, next) {
|
|
var id = ctx.instance ? ctx.instance.getId() :
|
|
getIdFromWhereByModelId(ctx.Model, ctx.where);
|
|
|
|
if (debug.enabled) {
|
|
debug('rectifyOnDelete %s -> ' + (id ? 'id %j' : '%s'),
|
|
ctx.Model.modelName, id ? id : 'ALL');
|
|
debug('context instance:%j where:%j', ctx.instance, ctx.where);
|
|
}
|
|
|
|
if (id) {
|
|
ctx.Model.rectifyChange(id, reportErrorAndNext);
|
|
} else {
|
|
ctx.Model.rectifyAllChanges(reportErrorAndNext);
|
|
}
|
|
|
|
function reportErrorAndNext(err) {
|
|
if (err) {
|
|
ctx.Model.handleChangeError(err, 'after delete');
|
|
}
|
|
next();
|
|
}
|
|
}
|
|
|
|
function getIdFromWhereByModelId(Model, where) {
|
|
var idName = Model.getIdName();
|
|
if (!(idName in where)) return undefined;
|
|
|
|
var id = where[idName];
|
|
// TODO(bajtos) support object values that are not LB conditions
|
|
if (typeof id === 'string' || typeof id === 'number') {
|
|
return id;
|
|
}
|
|
return undefined;
|
|
}
|
|
|
|
PersistedModel._defineChangeModel = function() {
|
|
var BaseChangeModel = this.registry.getModel('Change');
|
|
assert(BaseChangeModel,
|
|
'Change model must be defined before enabling change replication');
|
|
|
|
this.Change = BaseChangeModel.extend(this.modelName + '-change',
|
|
{},
|
|
{
|
|
trackModel: this
|
|
}
|
|
);
|
|
|
|
if (this.dataSource) {
|
|
attachRelatedModels(this);
|
|
}
|
|
|
|
// We have to attach related model whenever the datasource changes,
|
|
// this is a workaround for autoAttach called by loopback.createModel
|
|
var self = this;
|
|
this.on('dataSourceAttached', function() {
|
|
attachRelatedModels(self);
|
|
});
|
|
|
|
return this.Change;
|
|
|
|
function attachRelatedModels(self) {
|
|
self.Change.attachTo(self.dataSource);
|
|
self.Change.getCheckpointModel().attachTo(self.dataSource);
|
|
}
|
|
};
|
|
|
|
PersistedModel.rectifyAllChanges = function(callback) {
|
|
this.getChangeModel().rectifyAll(callback);
|
|
};
|
|
|
|
/**
|
|
* Handle a change error. Override this method in a subclassing model to customize
|
|
* change error handling.
|
|
*
|
|
* @param {Error} err Error object; see [Error object](http://docs.strongloop.com/display/LB/Error+object).
|
|
*/
|
|
|
|
PersistedModel.handleChangeError = function(err, operationName) {
|
|
if (!err) return;
|
|
this.emit('error', err, operationName);
|
|
};
|
|
|
|
/**
|
|
* Specify that a change to the model with the given ID has occurred.
|
|
*
|
|
* @param {*} id The ID of the model that has changed.
|
|
* @callback {Function} callback
|
|
* @param {Error} err
|
|
*/
|
|
|
|
PersistedModel.rectifyChange = function(id, callback) {
|
|
var Change = this.getChangeModel();
|
|
Change.rectifyModelChanges(this.modelName, [id], callback);
|
|
};
|
|
|
|
PersistedModel.findLastChange = function(id, cb) {
|
|
var Change = this.getChangeModel();
|
|
Change.findOne({ where: { modelId: id } }, cb);
|
|
};
|
|
|
|
PersistedModel.updateLastChange = function(id, data, cb) {
|
|
var self = this;
|
|
this.findLastChange(id, function(err, inst) {
|
|
if (err) return cb(err);
|
|
if (!inst) {
|
|
err = new Error('No change record found for ' +
|
|
self.modelName + ' with id ' + id);
|
|
err.statusCode = 404;
|
|
return cb(err);
|
|
}
|
|
|
|
inst.updateAttributes(data, cb);
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Create a change stream. [See here for more info](http://docs.strongloop.com/pages/viewpage.action?pageId=6721710)
|
|
*
|
|
* @param {Object} options
|
|
* @param {Object} options.where Only changes to models matching this where filter will be included in the `ChangeStream`.
|
|
* @callback {Function} callback
|
|
* @param {Error} err
|
|
* @param {ChangeStream} changes
|
|
*/
|
|
|
|
PersistedModel.createChangeStream = function(options, cb) {
|
|
if (typeof options === 'function') {
|
|
cb = options;
|
|
options = undefined;
|
|
}
|
|
|
|
var idName = this.getIdName();
|
|
var Model = this;
|
|
var changes = new PassThrough({objectMode: true});
|
|
var writeable = true;
|
|
|
|
changes.destroy = function() {
|
|
changes.removeAllListeners('error');
|
|
changes.removeAllListeners('end');
|
|
writeable = false;
|
|
changes = null;
|
|
};
|
|
|
|
changes.on('error', function() {
|
|
writeable = false;
|
|
});
|
|
changes.on('end', function() {
|
|
writeable = false;
|
|
});
|
|
|
|
process.nextTick(function() {
|
|
cb(null, changes);
|
|
});
|
|
|
|
Model.observe('after save', createChangeHandler('save'));
|
|
Model.observe('after delete', createChangeHandler('delete'));
|
|
|
|
function createChangeHandler(type) {
|
|
return function(ctx, next) {
|
|
// since it might have set to null via destroy
|
|
if (!changes) {
|
|
return next();
|
|
}
|
|
|
|
var where = ctx.where;
|
|
var data = ctx.instance || ctx.data;
|
|
var whereId = where && where[idName];
|
|
|
|
// the data includes the id
|
|
// or the where includes the id
|
|
var target;
|
|
|
|
if (data && (data[idName] || data[idName] === 0)) {
|
|
target = data[idName];
|
|
} else if (where && (where[idName] || where[idName] === 0)) {
|
|
target = where[idName];
|
|
}
|
|
|
|
var hasTarget = target === 0 || !!target;
|
|
|
|
var change = {
|
|
target: target,
|
|
where: where,
|
|
data: data
|
|
};
|
|
|
|
switch (type) {
|
|
case 'save':
|
|
if (ctx.isNewInstance === undefined) {
|
|
change.type = hasTarget ? 'update' : 'create';
|
|
} else {
|
|
change.type = ctx.isNewInstance ? 'create' : 'update';
|
|
}
|
|
|
|
break;
|
|
case 'delete':
|
|
change.type = 'remove';
|
|
break;
|
|
}
|
|
|
|
// TODO(ritch) this is ugly... maybe a ReadableStream would be better
|
|
if (writeable) {
|
|
changes.write(change);
|
|
}
|
|
|
|
next();
|
|
};
|
|
}
|
|
};
|
|
|
|
PersistedModel.setup();
|
|
|
|
return PersistedModel;
|
|
};
|