335 lines
8.2 KiB
JavaScript
335 lines
8.2 KiB
JavaScript
var safeRequire = require('../utils').safeRequire;
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/**
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* Module dependencies
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*/
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var cradle = safeRequire('cradle');
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/**
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* Private functions for internal use
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*/
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function CradleAdapter(client) {
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this._models = {};
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this.client = client;
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}
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function createdbif(client, callback) {
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client.exists(function (err, exists) {
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if(err) callback(err);
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if (!exists) { client.create(function() { callback(); }); }
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else { callback(); }
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});
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}
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function naturalize(data, model) {
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data.nature = model;
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//TODO: maybe this is not a really good idea
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if(data.date) data.date = data.date.toString();
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return data;
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}
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function idealize(data) {
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data.id = data._id;
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return data;
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}
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function stringify(data) {
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return data ? data.toString() : data
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}
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function errorHandler(callback, func) {
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return function(err, res) {
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if (err) {
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console.log('cradle', err);
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callback(err);
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} else {
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if(func) {
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func(res, function(res) {
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callback(null, res);
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});
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} else {
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callback(null, res);
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}
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}
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}
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};
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function synchronize(functions, args, callback) {
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if(functions.length === 0) callback();
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if(functions.length > 0 && args.length === functions.length) {
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functions[0](args[0][0], args[0][1], function(err, res) {
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if(err) callback(err);
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functions.splice(0, 1);
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args.splice(0, 1);
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synchronize(functions, args, callback);
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});
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}
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};
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function applyFilter(filter) {
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if (typeof filter.where === 'function') {
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return filter.where;
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}
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var keys = Object.keys(filter.where);
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return function (obj) {
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var pass = true;
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keys.forEach(function (key) {
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if (!test(filter.where[key], obj[key])) {
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pass = false;
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}
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});
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return pass;
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}
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function test(example, value) {
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if (typeof value === 'string' && example && example.constructor.name === 'RegExp') {
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return value.match(example);
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}
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// not strict equality
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return example == value;
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}
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}
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function numerically(a, b) {
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return a[this[0]] - b[this[0]];
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}
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function literally(a, b) {
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return a[this[0]] > b[this[0]];
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}
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function filtering(res, model, filter, instance) {
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if(model) {
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if(filter == null) filter = {};
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if(filter.where == null) filter.where = {};
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filter.where.nature = model;
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}
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// do we need some filtration?
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if (filter.where) {
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res = res ? res.filter(applyFilter(filter)) : res;
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}
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// do we need some sorting?
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if (filter.order) {
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var props = instance[model].properties;
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var allNumeric = true;
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var orders = filter.order;
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var reverse = false;
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if (typeof filter.order === "string") {
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orders = [filter.order];
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}
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orders.forEach(function (key, i) {
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var m = key.match(/\s+(A|DE)SC$/i);
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if (m) {
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key = key.replace(/\s+(A|DE)SC/i, '');
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if (m[1] === 'DE') reverse = true;
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}
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orders[i] = key;
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if (props[key].type.name !== 'Number') {
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allNumeric = false;
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}
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});
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if (allNumeric) {
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res = res.sort(numerically.bind(orders));
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} else {
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res = res.sort(literally.bind(orders));
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}
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if (reverse) res = res.reverse();
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}
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return res;
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}
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/**
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* Connection/Disconnection
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*/
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exports.initialize = function(schema, callback) {
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if (!cradle) return;
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if (!schema.settings.url) {
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var host = schema.settings.host || 'localhost';
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var port = schema.settings.port || '5984';
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var options = schema.settings.options || {
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cache: true,
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raw: false
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};
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if (schema.settings.username) {
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options.auth = {};
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options.auth.username = schema.settings.username;
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if (schema.settings.password) {
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options.auth.password = schema.settings.password;
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}
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}
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var database = schema.settings.database || 'jugglingdb';
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schema.settings.host = host;
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schema.settings.port = port;
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schema.settings.database = database;
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schema.settings.options = options;
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}
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schema.client = new(cradle.Connection)(schema.settings.host, schema.settings.port,schema.settings.options).database(schema.settings.database);
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createdbif(
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schema.client,
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errorHandler(callback, function() {
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schema.adapter = new CradleAdapter(schema.client);
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process.nextTick(callback);
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}));
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};
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CradleAdapter.prototype.disconnect = function() {
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};
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/**
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* Write methods
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*/
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CradleAdapter.prototype.define = function(descr) {
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this._models[descr.model.modelName] = descr;
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};
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CradleAdapter.prototype.create = function(model, data, callback) {
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this.client.save(
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stringify(data.id),
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naturalize(data, model),
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errorHandler(callback, function(res, cb) {
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cb(res.id);
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})
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);
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};
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CradleAdapter.prototype.save = function(model, data, callback) {
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this.client.save(
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stringify(data.id),
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naturalize(data, model),
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errorHandler(callback)
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)
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};
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CradleAdapter.prototype.updateAttributes = function(model, id, data, callback) {
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this.client.merge(
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stringify(id),
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data,
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errorHandler(callback, function(doc, cb) {
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cb(idealize(doc));
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})
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);
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};
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CradleAdapter.prototype.updateOrCreate = function(model, data, callback) {
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this.client.get(
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stringify(data.id),
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function (err, doc) {
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if(err) {
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this.create(model, data, callback);
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} else {
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this.updateAttributes(model, data.id, data, callback);
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}
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}.bind(this)
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)
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};
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/**
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* Read methods
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*/
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CradleAdapter.prototype.exists = function(model, id, callback) {
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this.client.get(
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stringify(id),
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errorHandler(callback, function(doc, cb) {
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cb(!!doc);
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})
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);
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};
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CradleAdapter.prototype.find = function(model, id, callback) {
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this.client.get(
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stringify(id),
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errorHandler(callback, function(doc, cb) {
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cb(idealize(doc));
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})
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);
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};
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CradleAdapter.prototype.count = function(model, callback, where) {
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this.models(
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model,
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{where: where},
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callback,
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function(docs, cb) {
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cb(docs.length);
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}
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);
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};
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CradleAdapter.prototype.models = function(model, filter, callback, func) {
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var limit = 200;
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var skip = 0;
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if (filter != null) {
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limit = filter.limit || limit;
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skip = filter.skip ||skip;
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}
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var self = this;
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self.client.save('_design/'+model, {
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views : {
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all : {
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map : 'function(doc) { if (doc.nature == "'+model+'") { emit(doc._id, doc); } }'
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}
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}
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}, function() {
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self.client.view(model+'/all', {include_docs:true, limit:limit, skip:skip}, errorHandler(callback, function(res, cb) {
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var docs = res.map(function(doc) {
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return idealize(doc);
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});
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var filtered = filtering(docs, model, filter, this._models)
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func ? func(filtered, cb) : cb(filtered);
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}.bind(self)));
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});
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};
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CradleAdapter.prototype.all = function(model, filter, callback) {
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this.models(
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model,
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filter,
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callback
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);
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};
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/**
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* Detroy methods
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*/
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CradleAdapter.prototype.destroy = function(model, id, callback) {
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this.client.remove(
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stringify(id),
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function (err, doc) {
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callback(err);
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}
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);
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};
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CradleAdapter.prototype.destroyAll = function(model, callback) {
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this.models(
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model,
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null,
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callback,
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function(docs, cb) {
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var docIds = docs.map(function(doc) {
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return doc.id;
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});
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this.client.get(docIds, function(err, res) {
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if(err) cb(err);
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var funcs = res.map(function(doc) {
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return this.client.remove.bind(this.client);
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}.bind(this));
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var args = res.map(function(doc) {
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return [doc._id, doc._rev];
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});
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synchronize(funcs, args, cb);
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}.bind(this));
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}.bind(this)
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);
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};
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