transaction.test.js
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// Copyright IBM Corp. 2015,2016. All Rights Reserved.
// Node module: loopback-connector-mysql
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT
'use strict';
var Transaction = require('loopback-datasource-juggler').Transaction;
require('./init.js');
require('should');
var db, Post, Review;
describe('transactions', function() {
before(function(done) {
db = getDataSource({collation: 'utf8_general_ci', createDatabase: true});
db.once('connected', function() {
Post = db.define('PostTX', {
title: {type: String, length: 255, index: true},
content: {type: String},
}, {mysql: {engine: 'INNODB'}});
Review = db.define('ReviewTX', {
author: String,
content: {type: String},
}, {mysql: {engine: 'INNODB'}});
Post.hasMany(Review, {as: 'reviews', foreignKey: 'postId'});
db.automigrate(['PostTX', 'ReviewTX'], done);
});
});
var currentTx;
var hooks = [];
// Return an async function to start a transaction and create a post
function createPostInTx(post, timeout) {
return function(done) {
// Transaction.begin(db.connector, Transaction.READ_COMMITTED,
Post.beginTransaction({
isolationLevel: Transaction.READ_COMMITTED,
timeout: timeout,
},
function(err, tx) {
if (err) return done(err);
(typeof tx.id).should.be.eql('string');
hooks = [];
tx.observe('before commit', function(context, next) {
hooks.push('before commit');
next();
});
tx.observe('after commit', function(context, next) {
hooks.push('after commit');
next();
});
tx.observe('before rollback', function(context, next) {
hooks.push('before rollback');
next();
});
tx.observe('after rollback', function(context, next) {
hooks.push('after rollback');
next();
});
currentTx = tx;
Post.create(post, {transaction: tx},
function(err, p) {
if (err) {
done(err);
} else {
p.reviews.create({
author: 'John',
content: 'Review for ' + p.title,
}, {transaction: tx},
function(err, c) {
done(err);
});
}
});
});
};
}
// Return an async function to find matching posts and assert number of
// records to equal to the count
function expectToFindPosts(where, count, inTx) {
return function(done) {
var options = {};
if (inTx) {
options.transaction = currentTx;
}
Post.find({where: where}, options,
function(err, posts) {
if (err) return done(err);
posts.length.should.be.eql(count);
if (count) {
// Find related reviews
// Please note the empty {} is required, otherwise, the options
// will be treated as a filter
posts[0].reviews({}, options, function(err, reviews) {
if (err) return done(err);
reviews.length.should.be.eql(count);
done();
});
} else {
done();
}
});
};
}
describe('commit', function() {
var post = {title: 't1', content: 'c1'};
before(createPostInTx(post));
it('should not see the uncommitted insert', expectToFindPosts(post, 0));
it('should see the uncommitted insert from the same transaction',
expectToFindPosts(post, 1, true));
it('should commit a transaction', function(done) {
currentTx.commit(function(err) {
hooks.should.be.eql(['before commit', 'after commit']);
done(err);
});
});
it('should see the committed insert', expectToFindPosts(post, 1));
it('should report error if the transaction is not active', function(done) {
currentTx.commit(function(err) {
(err).should.be.instanceof(Error);
done();
});
});
});
describe('rollback', function() {
var post = {title: 't2', content: 'c2'};
before(createPostInTx(post));
it('should not see the uncommitted insert', expectToFindPosts(post, 0));
it('should see the uncommitted insert from the same transaction',
expectToFindPosts(post, 1, true));
it('should rollback a transaction', function(done) {
currentTx.rollback(function(err) {
hooks.should.be.eql(['before rollback', 'after rollback']);
done(err);
});
});
it('should not see the rolledback insert', expectToFindPosts(post, 0));
it('should report error if the transaction is not active', function(done) {
currentTx.rollback(function(err) {
(err).should.be.instanceof(Error);
done();
});
});
});
describe('timeout', function() {
var post = {title: 't3', content: 'c3'};
before(createPostInTx(post, 500));
it('should invoke the timeout hook', function(done) {
currentTx.observe('timeout', function(context, next) {
next();
// It will only proceed upon timeout
done();
});
});
it('should rollback the transaction if timeout', function(done) {
Post.find({where: {title: 't3'}}, {transaction: currentTx},
function(err, posts) {
if (err) return done(err);
posts.length.should.be.eql(0);
done();
});
});
});
});