The JavaScript Database, for Node.js, nw.js, electron and the browser
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nedb/test/persistence.test.js

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var should = require('chai').should()
, assert = require('chai').assert
, testDb = 'workspace/test.db'
, fs = require('fs')
, path = require('path')
, _ = require('underscore')
, async = require('async')
, model = require('../lib/model')
, customUtils = require('../lib/customUtils')
, Datastore = require('../lib/datastore')
, Persistence = require('../lib/persistence')
, child_process = require('child_process')
;
describe('Persistence', function () {
var d;
beforeEach(function (done) {
d = new Datastore({ filename: testDb });
d.filename.should.equal(testDb);
d.inMemoryOnly.should.equal(false);
async.waterfall([
function (cb) {
Persistence.ensureDirectoryExists(path.dirname(testDb), function () {
fs.exists(testDb, function (exists) {
if (exists) {
fs.unlink(testDb, cb);
} else { return cb(); }
});
});
}
, function (cb) {
d.loadDatabase(function (err) {
assert.isNull(err);
d.getAllData().length.should.equal(0);
return cb();
});
}
], done);
});
it('Every line represents a document', function () {
var now = new Date()
, rawData = model.serialize({ _id: "1", a: 2, ages: [1, 5, 12] }) + '\n' +
model.serialize({ _id: "2", hello: 'world' }) + '\n' +
model.serialize({ _id: "3", nested: { today: now } })
, treatedData = Persistence.treatRawData(rawData)
;
treatedData.sort(function (a, b) { return a._id - b._id; });
treatedData.length.should.equal(3);
_.isEqual(treatedData[0], { _id: "1", a: 2, ages: [1, 5, 12] }).should.equal(true);
_.isEqual(treatedData[1], { _id: "2", hello: 'world' }).should.equal(true);
_.isEqual(treatedData[2], { _id: "3", nested: { today: now } }).should.equal(true);
});
it('Badly formatted lines have no impact on the treated data', function () {
var now = new Date()
, rawData = model.serialize({ _id: "1", a: 2, ages: [1, 5, 12] }) + '\n' +
'garbage\n' +
model.serialize({ _id: "3", nested: { today: now } })
, treatedData = Persistence.treatRawData(rawData)
;
treatedData.sort(function (a, b) { return a._id - b._id; });
treatedData.length.should.equal(2);
_.isEqual(treatedData[0], { _id: "1", a: 2, ages: [1, 5, 12] }).should.equal(true);
_.isEqual(treatedData[1], { _id: "3", nested: { today: now } }).should.equal(true);
});
it('Well formatted lines that have no _id are not included in the data', function () {
var now = new Date()
, rawData = model.serialize({ _id: "1", a: 2, ages: [1, 5, 12] }) + '\n' +
model.serialize({ _id: "2", hello: 'world' }) + '\n' +
model.serialize({ nested: { today: now } })
, treatedData = Persistence.treatRawData(rawData)
;
treatedData.sort(function (a, b) { return a._id - b._id; });
treatedData.length.should.equal(2);
_.isEqual(treatedData[0], { _id: "1", a: 2, ages: [1, 5, 12] }).should.equal(true);
_.isEqual(treatedData[1], { _id: "2", hello: 'world' }).should.equal(true);
});
it('If two lines concern the same doc (= same _id), the last one is the good version', function () {
var now = new Date()
, rawData = model.serialize({ _id: "1", a: 2, ages: [1, 5, 12] }) + '\n' +
model.serialize({ _id: "2", hello: 'world' }) + '\n' +
model.serialize({ _id: "1", nested: { today: now } })
, treatedData = Persistence.treatRawData(rawData)
;
treatedData.sort(function (a, b) { return a._id - b._id; });
treatedData.length.should.equal(2);
_.isEqual(treatedData[0], { _id: "1", nested: { today: now } }).should.equal(true);
_.isEqual(treatedData[1], { _id: "2", hello: 'world' }).should.equal(true);
});
it('If a doc contains $$deleted: true, that means we need to remove it from the data', function () {
var now = new Date()
, rawData = model.serialize({ _id: "1", a: 2, ages: [1, 5, 12] }) + '\n' +
model.serialize({ _id: "2", hello: 'world' }) + '\n' +
model.serialize({ _id: "1", $$deleted: true }) + '\n' +
model.serialize({ _id: "3", today: now })
, treatedData = Persistence.treatRawData(rawData)
;
treatedData.sort(function (a, b) { return a._id - b._id; });
treatedData.length.should.equal(2);
_.isEqual(treatedData[0], { _id: "2", hello: 'world' }).should.equal(true);
_.isEqual(treatedData[1], { _id: "3", today: now }).should.equal(true);
});
it('If a doc contains $$deleted: true, no error is thrown if the doc wasnt in the list before', function () {
var now = new Date()
, rawData = model.serialize({ _id: "1", a: 2, ages: [1, 5, 12] }) + '\n' +
model.serialize({ _id: "2", $$deleted: true }) + '\n' +
model.serialize({ _id: "3", today: now })
, treatedData = Persistence.treatRawData(rawData)
;
treatedData.sort(function (a, b) { return a._id - b._id; });
treatedData.length.should.equal(2);
_.isEqual(treatedData[0], { _id: "1", a: 2, ages: [1, 5, 12] }).should.equal(true);
_.isEqual(treatedData[1], { _id: "3", today: now }).should.equal(true);
});
it('Compact database on load', function (done) {
d.insert({ a: 2 }, function () {
d.insert({ a: 4 }, function () {
d.remove({ a: 2 }, {}, function () {
// Here, the underlying file is 3 lines long for only one document
var data = fs.readFileSync(d.filename, 'utf8').split('\n')
, filledCount = 0;
data.forEach(function (item) { if (item.length > 0) { filledCount += 1; } });
filledCount.should.equal(3);
d.loadDatabase(function (err) {
assert.isNull(err);
// Now, the file has been compacted and is only 1 line long
var data = fs.readFileSync(d.filename, 'utf8').split('\n')
, filledCount = 0;
data.forEach(function (item) { if (item.length > 0) { filledCount += 1; } });
filledCount.should.equal(1);
done();
});
})
});
});
});
it('Calling loadDatabase after the data was modified doesnt change its contents', function (done) {
d.loadDatabase(function () {
d.insert({ a: 1 }, function (err) {
assert.isNull(err);
d.insert({ a: 2 }, function (err) {
var data = d.getAllData()
, doc1 = _.find(data, function (doc) { return doc.a === 1; })
, doc2 = _.find(data, function (doc) { return doc.a === 2; })
;
assert.isNull(err);
data.length.should.equal(2);
doc1.a.should.equal(1);
doc2.a.should.equal(2);
d.loadDatabase(function (err) {
var data = d.getAllData()
, doc1 = _.find(data, function (doc) { return doc.a === 1; })
, doc2 = _.find(data, function (doc) { return doc.a === 2; })
;
assert.isNull(err);
data.length.should.equal(2);
doc1.a.should.equal(1);
doc2.a.should.equal(2);
done();
});
});
});
});
});
it('Calling loadDatabase after the datafile was removed will reset the database', function (done) {
d.loadDatabase(function () {
d.insert({ a: 1 }, function (err) {
assert.isNull(err);
d.insert({ a: 2 }, function (err) {
var data = d.getAllData()
, doc1 = _.find(data, function (doc) { return doc.a === 1; })
, doc2 = _.find(data, function (doc) { return doc.a === 2; })
;
assert.isNull(err);
data.length.should.equal(2);
doc1.a.should.equal(1);
doc2.a.should.equal(2);
fs.unlink(testDb, function (err) {
assert.isNull(err);
d.loadDatabase(function (err) {
assert.isNull(err);
d.getAllData().length.should.equal(0);
done();
});
});
});
});
});
});
it('Calling loadDatabase after the datafile was modified loads the new data', function (done) {
d.loadDatabase(function () {
d.insert({ a: 1 }, function (err) {
assert.isNull(err);
d.insert({ a: 2 }, function (err) {
var data = d.getAllData()
, doc1 = _.find(data, function (doc) { return doc.a === 1; })
, doc2 = _.find(data, function (doc) { return doc.a === 2; })
;
assert.isNull(err);
data.length.should.equal(2);
doc1.a.should.equal(1);
doc2.a.should.equal(2);
fs.writeFile(testDb, '{"a":3,"_id":"aaa"}', 'utf8', function (err) {
assert.isNull(err);
d.loadDatabase(function (err) {
var data = d.getAllData()
, doc1 = _.find(data, function (doc) { return doc.a === 1; })
, doc2 = _.find(data, function (doc) { return doc.a === 2; })
, doc3 = _.find(data, function (doc) { return doc.a === 3; })
;
assert.isNull(err);
data.length.should.equal(1);
doc3.a.should.equal(3);
assert.isUndefined(doc1);
assert.isUndefined(doc2);
done();
});
});
});
});
});
});
describe('Prevent dataloss when persisting data', function () {
it('Creating a datastore with in memory as true and a bad filename wont cause an error', function () {
new Datastore({ filename: 'workspace/bad.db~', inMemoryOnly: true });
})
it('Creating a persistent datastore with a bad filename will cause an error', function () {
(function () { new Datastore({ filename: 'workspace/bad.db~' }); }).should.throw();
})
it('If no file exists, ensureDatafileIntegrity creates an empty datafile', function (done) {
var p = new Persistence({ db: { inMemoryOnly: false, filename: 'workspace/it.db' } });
if (fs.existsSync('workspace/it.db')) { fs.unlinkSync('workspace/it.db'); }
if (fs.existsSync('workspace/it.db~~')) { fs.unlinkSync('workspace/it.db~~'); }
fs.existsSync('workspace/it.db').should.equal(false);
fs.existsSync('workspace/it.db~~').should.equal(false);
p.ensureDatafileIntegrity(function (err) {
assert.isNull(err);
fs.existsSync('workspace/it.db').should.equal(true);
fs.existsSync('workspace/it.db~~').should.equal(false);
fs.readFileSync('workspace/it.db', 'utf8').should.equal('');
done();
});
});
it('If only datafile exists, ensureDatafileIntegrity will use it', function (done) {
var p = new Persistence({ db: { inMemoryOnly: false, filename: 'workspace/it.db' } });
if (fs.existsSync('workspace/it.db')) { fs.unlinkSync('workspace/it.db'); }
if (fs.existsSync('workspace/it.db~~')) { fs.unlinkSync('workspace/it.db~~'); }
fs.writeFileSync('workspace/it.db', 'something', 'utf8');
fs.existsSync('workspace/it.db').should.equal(true);
fs.existsSync('workspace/it.db~~').should.equal(false);
p.ensureDatafileIntegrity(function (err) {
assert.isNull(err);
fs.existsSync('workspace/it.db').should.equal(true);
fs.existsSync('workspace/it.db~~').should.equal(false);
fs.readFileSync('workspace/it.db', 'utf8').should.equal('something');
done();
});
});
it('If old datafile exists and datafile doesnt, ensureDatafileIntegrity will use it', function (done) {
var p = new Persistence({ db: { inMemoryOnly: false, filename: 'workspace/it.db' } });
if (fs.existsSync('workspace/it.db')) { fs.unlinkSync('workspace/it.db'); }
if (fs.existsSync('workspace/it.db~~')) { fs.unlinkSync('workspace/it.db~~'); }
fs.writeFileSync('workspace/it.db~~', 'something', 'utf8');
fs.existsSync('workspace/it.db').should.equal(false);
fs.existsSync('workspace/it.db~~').should.equal(true);
p.ensureDatafileIntegrity(function (err) {
assert.isNull(err);
fs.existsSync('workspace/it.db').should.equal(true);
fs.existsSync('workspace/it.db~~').should.equal(false);
fs.readFileSync('workspace/it.db', 'utf8').should.equal('something');
done();
});
});
it('If both old and current datafiles exist, ensureDatafileIntegrity will use the datafile, it means step 1 of persistence failed', function (done) {
var theDb = new Datastore({ filename: 'workspace/it.db' });
if (fs.existsSync('workspace/it.db')) { fs.unlinkSync('workspace/it.db'); }
if (fs.existsSync('workspace/it.db~~')) { fs.unlinkSync('workspace/it.db~~'); }
fs.writeFileSync('workspace/it.db', '{"_id":"0","hello":"world"}', 'utf8');
fs.writeFileSync('workspace/it.db~~', '{"_id":"0","hello":"other"}', 'utf8');
fs.existsSync('workspace/it.db').should.equal(true);
fs.existsSync('workspace/it.db~~').should.equal(true);
theDb.persistence.ensureDatafileIntegrity(function (err) {
assert.isNull(err);
fs.existsSync('workspace/it.db').should.equal(true);
fs.existsSync('workspace/it.db~~').should.equal(true);
fs.readFileSync('workspace/it.db', 'utf8').should.equal('{"_id":"0","hello":"world"}');
theDb.loadDatabase(function (err) {
assert.isNull(err);
theDb.find({}, function (err, docs) {
assert.isNull(err);
docs.length.should.equal(1);
docs[0].hello.should.equal("world");
done();
});
});
});
});
it('persistCachedDatabase should update the contents of the datafile and leave a clean state', function (done) {
d.insert({ hello: 'world' }, function () {
d.find({}, function (err, docs) {
docs.length.should.equal(1);
if (fs.existsSync(testDb)) { fs.unlinkSync(testDb); }
if (fs.existsSync(testDb + '~')) { fs.unlinkSync(testDb + '~'); }
if (fs.existsSync(testDb + '~~')) { fs.unlinkSync(testDb + '~~'); }
fs.existsSync(testDb).should.equal(false);
fs.existsSync(testDb + '~').should.equal(false);
fs.existsSync(testDb + '~~').should.equal(false);
d.persistence.persistCachedDatabase(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.match(/^{"hello":"world","_id":"[0-9a-zA-Z]{16}"}\n$/)) {
throw "Datafile contents not as expected";
}
done();
});
});
});
});
it('After a persistCachedDatabase, there should be no temp or old filename', function (done) {
d.insert({ hello: 'world' }, function () {
d.find({}, function (err, docs) {
docs.length.should.equal(1);
if (fs.existsSync(testDb)) { fs.unlinkSync(testDb); }
if (fs.existsSync(testDb + '~')) { fs.unlinkSync(testDb + '~'); }
if (fs.existsSync(testDb + '~~')) { fs.unlinkSync(testDb + '~~'); }
fs.existsSync(testDb).should.equal(false);
fs.writeFileSync(testDb + '~', 'bloup', 'utf8');
fs.writeFileSync(testDb + '~~', 'blap', 'utf8');
fs.existsSync(testDb + '~').should.equal(true);
fs.existsSync(testDb + '~~').should.equal(true);
d.persistence.persistCachedDatabase(function (err) {
var contents = fs.readFileSync(testDb, 'utf8');
assert.isNull(err);
fs.existsSync(testDb).should.equal(true);
fs.existsSync(testDb + '~').should.equal(false);
fs.existsSync(testDb + '~~').should.equal(false);
if (!contents.match(/^{"hello":"world","_id":"[0-9a-zA-Z]{16}"}\n$/)) {
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) {
d.insert({ hello: 'world' }, function () {
d.find({}, function (err, docs) {
docs.length.should.equal(1);
if (fs.existsSync(testDb)) { fs.unlinkSync(testDb); }
fs.writeFileSync(testDb + '~', 'blabla', 'utf8');
fs.writeFileSync(testDb + '~~', 'bloblo', 'utf8');
fs.existsSync(testDb).should.equal(false);
fs.existsSync(testDb + '~').should.equal(true);
fs.existsSync(testDb + '~~').should.equal(true);
d.persistence.persistCachedDatabase(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.match(/^{"hello":"world","_id":"[0-9a-zA-Z]{16}"}\n$/)) {
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);
});
});
});