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524 lines
21 KiB
524 lines
21 KiB
var should = require('chai').should()
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, assert = require('chai').assert
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, testDb = 'workspace/test.db'
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, fs = require('fs')
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, path = require('path')
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, _ = require('underscore')
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, async = require('async')
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, model = require('../lib/model')
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, customUtils = require('../lib/customUtils')
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, Datastore = require('../lib/datastore')
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, Persistence = require('../lib/persistence')
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, child_process = require('child_process')
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;
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describe('Persistence', function () {
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var d;
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beforeEach(function (done) {
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d = new Datastore({ filename: testDb });
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d.filename.should.equal(testDb);
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d.inMemoryOnly.should.equal(false);
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async.waterfall([
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function (cb) {
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Persistence.ensureDirectoryExists(path.dirname(testDb), function () {
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fs.exists(testDb, function (exists) {
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if (exists) {
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fs.unlink(testDb, cb);
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} else { return cb(); }
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});
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});
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}
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, function (cb) {
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d.loadDatabase(function (err) {
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assert.isNull(err);
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d.getAllData().length.should.equal(0);
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return cb();
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});
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}
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], done);
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});
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it('Every line represents a document', function () {
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var now = new Date()
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, rawData = model.serialize({ _id: "1", a: 2, ages: [1, 5, 12] }) + '\n' +
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model.serialize({ _id: "2", hello: 'world' }) + '\n' +
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model.serialize({ _id: "3", nested: { today: now } })
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, treatedData = Persistence.treatRawData(rawData)
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;
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treatedData.sort(function (a, b) { return a._id - b._id; });
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treatedData.length.should.equal(3);
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_.isEqual(treatedData[0], { _id: "1", a: 2, ages: [1, 5, 12] }).should.equal(true);
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_.isEqual(treatedData[1], { _id: "2", hello: 'world' }).should.equal(true);
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_.isEqual(treatedData[2], { _id: "3", nested: { today: now } }).should.equal(true);
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});
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it('Badly formatted lines have no impact on the treated data', function () {
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var now = new Date()
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, rawData = model.serialize({ _id: "1", a: 2, ages: [1, 5, 12] }) + '\n' +
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'garbage\n' +
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model.serialize({ _id: "3", nested: { today: now } })
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, treatedData = Persistence.treatRawData(rawData)
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;
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treatedData.sort(function (a, b) { return a._id - b._id; });
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treatedData.length.should.equal(2);
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_.isEqual(treatedData[0], { _id: "1", a: 2, ages: [1, 5, 12] }).should.equal(true);
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_.isEqual(treatedData[1], { _id: "3", nested: { today: now } }).should.equal(true);
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});
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it('Well formatted lines that have no _id are not included in the data', function () {
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var now = new Date()
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, rawData = model.serialize({ _id: "1", a: 2, ages: [1, 5, 12] }) + '\n' +
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model.serialize({ _id: "2", hello: 'world' }) + '\n' +
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model.serialize({ nested: { today: now } })
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, treatedData = Persistence.treatRawData(rawData)
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;
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treatedData.sort(function (a, b) { return a._id - b._id; });
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treatedData.length.should.equal(2);
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_.isEqual(treatedData[0], { _id: "1", a: 2, ages: [1, 5, 12] }).should.equal(true);
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_.isEqual(treatedData[1], { _id: "2", hello: 'world' }).should.equal(true);
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});
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it('If two lines concern the same doc (= same _id), the last one is the good version', function () {
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var now = new Date()
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, rawData = model.serialize({ _id: "1", a: 2, ages: [1, 5, 12] }) + '\n' +
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model.serialize({ _id: "2", hello: 'world' }) + '\n' +
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model.serialize({ _id: "1", nested: { today: now } })
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, treatedData = Persistence.treatRawData(rawData)
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;
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treatedData.sort(function (a, b) { return a._id - b._id; });
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treatedData.length.should.equal(2);
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_.isEqual(treatedData[0], { _id: "1", nested: { today: now } }).should.equal(true);
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_.isEqual(treatedData[1], { _id: "2", hello: 'world' }).should.equal(true);
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});
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it('If a doc contains $$deleted: true, that means we need to remove it from the data', function () {
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var now = new Date()
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, rawData = model.serialize({ _id: "1", a: 2, ages: [1, 5, 12] }) + '\n' +
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model.serialize({ _id: "2", hello: 'world' }) + '\n' +
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model.serialize({ _id: "1", $$deleted: true }) + '\n' +
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model.serialize({ _id: "3", today: now })
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, treatedData = Persistence.treatRawData(rawData)
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;
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treatedData.sort(function (a, b) { return a._id - b._id; });
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treatedData.length.should.equal(2);
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_.isEqual(treatedData[0], { _id: "2", hello: 'world' }).should.equal(true);
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_.isEqual(treatedData[1], { _id: "3", today: now }).should.equal(true);
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});
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it('If a doc contains $$deleted: true, no error is thrown if the doc wasnt in the list before', function () {
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var now = new Date()
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, rawData = model.serialize({ _id: "1", a: 2, ages: [1, 5, 12] }) + '\n' +
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model.serialize({ _id: "2", $$deleted: true }) + '\n' +
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model.serialize({ _id: "3", today: now })
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, treatedData = Persistence.treatRawData(rawData)
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;
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treatedData.sort(function (a, b) { return a._id - b._id; });
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treatedData.length.should.equal(2);
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_.isEqual(treatedData[0], { _id: "1", a: 2, ages: [1, 5, 12] }).should.equal(true);
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_.isEqual(treatedData[1], { _id: "3", today: now }).should.equal(true);
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});
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it('Compact database on load', function (done) {
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d.insert({ a: 2 }, function () {
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d.insert({ a: 4 }, function () {
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d.remove({ a: 2 }, {}, function () {
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// Here, the underlying file is 3 lines long for only one document
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var data = fs.readFileSync(d.filename, 'utf8').split('\n')
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, filledCount = 0;
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data.forEach(function (item) { if (item.length > 0) { filledCount += 1; } });
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filledCount.should.equal(3);
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d.loadDatabase(function (err) {
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assert.isNull(err);
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// Now, the file has been compacted and is only 1 line long
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var data = fs.readFileSync(d.filename, 'utf8').split('\n')
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, filledCount = 0;
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data.forEach(function (item) { if (item.length > 0) { filledCount += 1; } });
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filledCount.should.equal(1);
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done();
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});
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})
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});
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});
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});
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it('Calling loadDatabase after the data was modified doesnt change its contents', function (done) {
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d.loadDatabase(function () {
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d.insert({ a: 1 }, function (err) {
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assert.isNull(err);
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d.insert({ a: 2 }, function (err) {
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var data = d.getAllData()
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, doc1 = _.find(data, function (doc) { return doc.a === 1; })
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, doc2 = _.find(data, function (doc) { return doc.a === 2; })
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;
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assert.isNull(err);
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data.length.should.equal(2);
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doc1.a.should.equal(1);
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doc2.a.should.equal(2);
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d.loadDatabase(function (err) {
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var data = d.getAllData()
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, doc1 = _.find(data, function (doc) { return doc.a === 1; })
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, doc2 = _.find(data, function (doc) { return doc.a === 2; })
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;
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assert.isNull(err);
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data.length.should.equal(2);
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doc1.a.should.equal(1);
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doc2.a.should.equal(2);
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done();
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});
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});
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});
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});
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});
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it('Calling loadDatabase after the datafile was removed will reset the database', function (done) {
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d.loadDatabase(function () {
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d.insert({ a: 1 }, function (err) {
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assert.isNull(err);
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d.insert({ a: 2 }, function (err) {
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var data = d.getAllData()
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, doc1 = _.find(data, function (doc) { return doc.a === 1; })
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, doc2 = _.find(data, function (doc) { return doc.a === 2; })
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;
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assert.isNull(err);
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data.length.should.equal(2);
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doc1.a.should.equal(1);
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doc2.a.should.equal(2);
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fs.unlink(testDb, function (err) {
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assert.isNull(err);
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d.loadDatabase(function (err) {
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assert.isNull(err);
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d.getAllData().length.should.equal(0);
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done();
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});
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});
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});
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});
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});
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});
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it('Calling loadDatabase after the datafile was modified loads the new data', function (done) {
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d.loadDatabase(function () {
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d.insert({ a: 1 }, function (err) {
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assert.isNull(err);
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d.insert({ a: 2 }, function (err) {
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var data = d.getAllData()
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, doc1 = _.find(data, function (doc) { return doc.a === 1; })
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, doc2 = _.find(data, function (doc) { return doc.a === 2; })
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;
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assert.isNull(err);
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data.length.should.equal(2);
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doc1.a.should.equal(1);
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doc2.a.should.equal(2);
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fs.writeFile(testDb, '{"a":3,"_id":"aaa"}', 'utf8', function (err) {
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assert.isNull(err);
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d.loadDatabase(function (err) {
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var data = d.getAllData()
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, doc1 = _.find(data, function (doc) { return doc.a === 1; })
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, doc2 = _.find(data, function (doc) { return doc.a === 2; })
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, doc3 = _.find(data, function (doc) { return doc.a === 3; })
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;
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assert.isNull(err);
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data.length.should.equal(1);
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doc3.a.should.equal(3);
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assert.isUndefined(doc1);
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assert.isUndefined(doc2);
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done();
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});
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});
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});
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});
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});
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});
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describe('Prevent dataloss when persisting data', function () {
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it('Creating a datastore with in memory as true and a bad filename wont cause an error', function () {
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new Datastore({ filename: 'workspace/bad.db~', inMemoryOnly: true });
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})
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it('Creating a persistent datastore with a bad filename will cause an error', function () {
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(function () { new Datastore({ filename: 'workspace/bad.db~' }); }).should.throw();
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})
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it('If no file exists, ensureDatafileIntegrity creates an empty datafile', function (done) {
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var p = new Persistence({ db: { inMemoryOnly: false, filename: 'workspace/it.db' } });
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if (fs.existsSync('workspace/it.db')) { fs.unlinkSync('workspace/it.db'); }
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if (fs.existsSync('workspace/it.db~~')) { fs.unlinkSync('workspace/it.db~~'); }
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fs.existsSync('workspace/it.db').should.equal(false);
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fs.existsSync('workspace/it.db~~').should.equal(false);
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p.ensureDatafileIntegrity(function (err) {
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assert.isNull(err);
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fs.existsSync('workspace/it.db').should.equal(true);
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fs.existsSync('workspace/it.db~~').should.equal(false);
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fs.readFileSync('workspace/it.db', 'utf8').should.equal('');
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done();
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});
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});
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it('If only datafile exists, ensureDatafileIntegrity will use it', function (done) {
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var p = new Persistence({ db: { inMemoryOnly: false, filename: 'workspace/it.db' } });
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if (fs.existsSync('workspace/it.db')) { fs.unlinkSync('workspace/it.db'); }
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if (fs.existsSync('workspace/it.db~~')) { fs.unlinkSync('workspace/it.db~~'); }
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fs.writeFileSync('workspace/it.db', 'something', 'utf8');
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fs.existsSync('workspace/it.db').should.equal(true);
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fs.existsSync('workspace/it.db~~').should.equal(false);
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p.ensureDatafileIntegrity(function (err) {
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assert.isNull(err);
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fs.existsSync('workspace/it.db').should.equal(true);
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fs.existsSync('workspace/it.db~~').should.equal(false);
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fs.readFileSync('workspace/it.db', 'utf8').should.equal('something');
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done();
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});
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});
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it('If old datafile exists and datafile doesnt, ensureDatafileIntegrity will use it', function (done) {
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var p = new Persistence({ db: { inMemoryOnly: false, filename: 'workspace/it.db' } });
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if (fs.existsSync('workspace/it.db')) { fs.unlinkSync('workspace/it.db'); }
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if (fs.existsSync('workspace/it.db~~')) { fs.unlinkSync('workspace/it.db~~'); }
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fs.writeFileSync('workspace/it.db~~', 'something', 'utf8');
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fs.existsSync('workspace/it.db').should.equal(false);
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fs.existsSync('workspace/it.db~~').should.equal(true);
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p.ensureDatafileIntegrity(function (err) {
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assert.isNull(err);
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fs.existsSync('workspace/it.db').should.equal(true);
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fs.existsSync('workspace/it.db~~').should.equal(false);
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fs.readFileSync('workspace/it.db', 'utf8').should.equal('something');
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done();
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});
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});
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it('If both old and current datafiles exist, ensureDatafileIntegrity will use the datafile, it means step 1 of persistence failed', function (done) {
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var theDb = new Datastore({ filename: 'workspace/it.db' });
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if (fs.existsSync('workspace/it.db')) { fs.unlinkSync('workspace/it.db'); }
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if (fs.existsSync('workspace/it.db~~')) { fs.unlinkSync('workspace/it.db~~'); }
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fs.writeFileSync('workspace/it.db', '{"_id":"0","hello":"world"}', 'utf8');
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fs.writeFileSync('workspace/it.db~~', '{"_id":"0","hello":"other"}', 'utf8');
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fs.existsSync('workspace/it.db').should.equal(true);
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fs.existsSync('workspace/it.db~~').should.equal(true);
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theDb.persistence.ensureDatafileIntegrity(function (err) {
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assert.isNull(err);
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fs.existsSync('workspace/it.db').should.equal(true);
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fs.existsSync('workspace/it.db~~').should.equal(true);
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fs.readFileSync('workspace/it.db', 'utf8').should.equal('{"_id":"0","hello":"world"}');
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theDb.loadDatabase(function (err) {
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assert.isNull(err);
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theDb.find({}, function (err, docs) {
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assert.isNull(err);
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docs.length.should.equal(1);
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docs[0].hello.should.equal("world");
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done();
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});
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});
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});
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});
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it('persistCachedDatabase should update the contents of the datafile and leave a clean state', function (done) {
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d.insert({ hello: 'world' }, function () {
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d.find({}, function (err, docs) {
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docs.length.should.equal(1);
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if (fs.existsSync(testDb)) { fs.unlinkSync(testDb); }
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if (fs.existsSync(testDb + '~')) { fs.unlinkSync(testDb + '~'); }
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if (fs.existsSync(testDb + '~~')) { fs.unlinkSync(testDb + '~~'); }
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fs.existsSync(testDb).should.equal(false);
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fs.writeFileSync(testDb + '~', 'something', 'utf8');
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fs.writeFileSync(testDb + '~~', 'something else', 'utf8');
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fs.existsSync(testDb + '~').should.equal(true);
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fs.existsSync(testDb + '~~').should.equal(true);
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d.persistence.persistCachedDatabase(function (err) {
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var contents = fs.readFileSync(testDb, 'utf8');
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assert.isNull(err);
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fs.existsSync(testDb).should.equal(true);
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fs.existsSync(testDb + '~').should.equal(false);
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fs.existsSync(testDb + '~~').should.equal(false);
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if (!contents.match(/^{"hello":"world","_id":"[0-9a-zA-Z]{16}"}\n$/)) {
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throw "Datafile contents not as expected";
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}
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done();
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});
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});
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});
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});
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it('After a persistCachedDatabase, there should be no temp or old filename', function (done) {
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d.insert({ hello: 'world' }, function () {
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d.find({}, function (err, docs) {
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docs.length.should.equal(1);
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if (fs.existsSync(testDb)) { fs.unlinkSync(testDb); }
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if (fs.existsSync(testDb + '~')) { fs.unlinkSync(testDb + '~'); }
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if (fs.existsSync(testDb + '~~')) { fs.unlinkSync(testDb + '~~'); }
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fs.existsSync(testDb).should.equal(false);
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fs.writeFileSync(testDb + '~', 'bloup', 'utf8');
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fs.writeFileSync(testDb + '~~', 'blap', 'utf8');
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fs.existsSync(testDb + '~').should.equal(true);
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fs.existsSync(testDb + '~~').should.equal(true);
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d.persistence.persistCachedDatabase(function (err) {
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var contents = fs.readFileSync(testDb, 'utf8');
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assert.isNull(err);
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fs.existsSync(testDb).should.equal(true);
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fs.existsSync(testDb + '~').should.equal(false);
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fs.existsSync(testDb + '~~').should.equal(false);
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if (!contents.match(/^{"hello":"world","_id":"[0-9a-zA-Z]{16}"}\n$/)) {
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throw "Datafile contents not as expected";
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}
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done();
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});
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});
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});
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});
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it('persistCachedDatabase should update the contents of the datafile and leave a clean state even if there is a temp or old datafile', function (done) {
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d.insert({ hello: 'world' }, function () {
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d.find({}, function (err, docs) {
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docs.length.should.equal(1);
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if (fs.existsSync(testDb)) { fs.unlinkSync(testDb); }
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fs.writeFileSync(testDb + '~', 'blabla', 'utf8');
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fs.writeFileSync(testDb + '~~', 'bloblo', 'utf8');
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fs.existsSync(testDb).should.equal(false);
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fs.existsSync(testDb + '~').should.equal(true);
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fs.existsSync(testDb + '~~').should.equal(true);
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d.persistence.persistCachedDatabase(function (err) {
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var contents = fs.readFileSync(testDb, 'utf8');
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assert.isNull(err);
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fs.existsSync(testDb).should.equal(true);
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fs.existsSync(testDb + '~').should.equal(false);
|
|
fs.existsSync(testDb + '~~').should.equal(false);
|
|
if (!contents.match(/^{"hello":"world","_id":"[0-9a-zA-Z]{16}"}\n$/)) {
|
|
throw "Datafile contents not as expected";
|
|
}
|
|
done();
|
|
});
|
|
});
|
|
});
|
|
});
|
|
|
|
it('persistCachedDatabase should update the contents of the datafile and leave a clean state even if there is a temp or old datafile', function (done) {
|
|
var testDb = 'workspace/test2.db', theDb;
|
|
|
|
if (fs.existsSync(testDb)) { fs.unlinkSync(testDb); }
|
|
if (fs.existsSync(testDb + '~')) { fs.unlinkSync(testDb + '~'); }
|
|
if (fs.existsSync(testDb + '~~')) { fs.unlinkSync(testDb + '~~'); }
|
|
|
|
theDb = new Datastore({ filename: testDb });
|
|
|
|
theDb.loadDatabase(function (err) {
|
|
var contents = fs.readFileSync(testDb, 'utf8');
|
|
assert.isNull(err);
|
|
fs.existsSync(testDb).should.equal(true);
|
|
fs.existsSync(testDb + '~').should.equal(false);
|
|
fs.existsSync(testDb + '~~').should.equal(false);
|
|
if (contents != "") {
|
|
throw "Datafile contents not as expected";
|
|
}
|
|
done();
|
|
});
|
|
});
|
|
|
|
|
|
// This test is a bit complicated since it depends on the time I/O actions take to execute
|
|
// That depends on the machine and the load on the machine when the tests are run
|
|
// It is timed for my machine with nothing else running but may not work as expected on others (it will not fail but may not be a proof)
|
|
// Every new version of NeDB passes it on my machine before rtelease
|
|
it('If system crashes during a loadDatabase, the former version is not lost', function (done) {
|
|
var cp, N = 150000, toWrite = "", i;
|
|
|
|
// Ensuring the state is clean
|
|
if (fs.existsSync('workspace/lac.db')) { fs.unlinkSync('workspace/lac.db'); }
|
|
if (fs.existsSync('workspace/lac.db~')) { fs.unlinkSync('workspace/lac.db~'); }
|
|
|
|
// Creating a db file with 150k records (a bit long to load)
|
|
for (i = 0; i < N; i += 1) {
|
|
toWrite += model.serialize({ _id: customUtils.uid(16), hello: 'world' }) + '\n';
|
|
}
|
|
fs.writeFileSync('workspace/lac.db', toWrite, 'utf8');
|
|
|
|
// Loading it in a separate process that we will crash before finishing the loadDatabase
|
|
cp = child_process.fork('test_lac/loadAndCrash.test')
|
|
|
|
// Kill the child process when we're at step 3 of persistCachedDatabase (during write to datafile)
|
|
setTimeout(function() {
|
|
cp.kill('SIGINT');
|
|
|
|
// If the timing is correct, only the temp datafile contains data
|
|
// The datafile was in the middle of being written and is empty
|
|
|
|
// Let the process crash be finished then load database without a crash, and test we didn't lose data
|
|
setTimeout(function () {
|
|
var db = new Datastore({ filename: 'workspace/lac.db' });
|
|
db.loadDatabase(function (err) {
|
|
assert.isNull(err);
|
|
|
|
db.count({}, function (err, n) {
|
|
// Data has not been lost
|
|
assert.isNull(err);
|
|
n.should.equal(150000);
|
|
|
|
// State is clean, the temp datafile has been erased and the datafile contains all the data
|
|
fs.existsSync('workspace/lac.db').should.equal(true);
|
|
fs.existsSync('workspace/lac.db~').should.equal(false);
|
|
|
|
done();
|
|
});
|
|
});
|
|
}, 100);
|
|
}, 2000);
|
|
});
|
|
|
|
});
|
|
|
|
});
|
|
|