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transaction.test.js
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var chai = require('chai'),
spies = require('chai-spies'),
AWS = require('aws-sdk'),
_= require('underscore'),
dyngo= require('../index.js');
chai.use(spies);
var should= chai.should(),
assert= chai.assert;
const noerr= function (done)
{
return function (err)
{
should.not.exist(err);
done();
};
},
accept= function (code,done)
{
return function (err)
{
if (err.code==code)
done();
else
done(err);
};
};
describe('transactions',function ()
{
var db;
before(function (done)
{
dyngo({ dynamo: { endpoint: new AWS.Endpoint('http://localhost:8000') }, hints: false },
function (err,_db)
{
db= _db;
db.ensureTransactionTable().success(done).error(done);
});
});
beforeEach(function (done)
{
db.test.remove().success(done)
.error(done);
});
describe('insert',function ()
{
it('If transaction A inserts a new object transaction B cannot see it while not committed (transient)',
function (done)
{
db.transaction().transaction(function (A)
{
db.transaction().transaction(function (B)
{
A.test.save({ _id: 'transient' }).success(function ()
{
B.test.findOne({ _id: 'transient' })
.result(should.not.exist)
.error(accept('notfound',done));
}).error(done);
}).error(done);
}).error(done);
});
it('If transaction A inserts a new object, while there was a transient object already present, transaction B cannot see it while not committed (transient)',
function (done)
{
db.transaction().transaction(function (A)
{
db.transaction().transaction(function (B)
{
A.test.save({ _id: 'transient2' }).success(function ()
{
A.test.save({ _id: 'transient2' }).success(function ()
{
B.test.findOne({ _id: 'transient2' })
.result(should.not.exist)
.error(accept('notfound',done));
}).error(done);
}).error(done);
}).error(done);
}).error(done);
});
it('If transaction A inserts a new object, and commit, transaction B can see the new object',
function (done)
{
db.transaction().transaction(function (A)
{
db.transaction().transaction(function (B)
{
A.test.save({ _id: 'transient3' }).success(function ()
{
A.commit().committed(function ()
{
B.test.findOne({ _id: 'transient3' })
.result(function (r)
{
should.exist(r);
r._id.should.equal('transient3');
done();
})
.error(done);
}).error(done);
}).error(done);
}).error(done);
}).error(done);
});
});
describe('delete',function ()
{
it('If transaction A deletes an object and does not commit, transaction B can see the object, but transaction A can\'t',
function (done)
{
db.test.save({ _id: 'delete1' }).success(function ()
{
db.transaction().transaction(function (A)
{
db.transaction().transaction(function (B)
{
A.test.remove({ _id: 'delete1' }).success(function ()
{
B.test.findOne({ _id: 'delete1' })
.result(function (r)
{
should.exist(r);
r._id.should.equal('delete1');
A.test.findOne({ _id: 'delete1' })
.result(should.not.exist)
.error(accept('notfound',done));
})
.error(done);
}).error(done);
}).error(done);
}).error(done);
}).error(done);
});
it('If transaction A deletes an object and commit, transaction B cannot see the object',
function (done)
{
db.test.save({ _id: 'delete2' }).success(function ()
{
db.transaction().transaction(function (A)
{
db.transaction().transaction(function (B)
{
A.test.remove({ _id: 'delete2' }).success(function ()
{
A.commit().committed(function ()
{
B.test.findOne({ _id: 'delete2' })
.result(should.not.exist)
.error(accept('notfound',done));
}).error(done);
}).error(done);
}).error(done);
}).error(done);
}).error(done);
});
});
describe('update',function ()
{
it('If transaction A updates an object and does not commit, transaction B still see the old version of the object, when A commits, B sees the new version',
function (done)
{
var obj= { _id: 'update1', n: 0 };
db.test.save(obj).success(function ()
{
db.transaction().transaction(function (A)
{
db.transaction().transaction(function (B)
{
obj.name= 'Update2';
obj.n++;
A.test.save(obj).success(function ()
{
B.test.findOne({ _id: 'update1' })
.result(function (copy)
{
should.not.exist(copy.name);
copy.n.should.equal(0);
A.test.findOne({ _id: 'update1' })
.result(function (copy)
{
copy.name.should.equal('Update2');
copy.n.should.equal(1);
A.commit().committed(function ()
{
B.test.findOne({ _id: 'update1' })
.result(function (copy)
{
copy.name.should.equal('Update2');
copy.n.should.equal(1);
done();
})
.error(done);
})
.error(done);
})
.error(done);
})
.error(done);
}).error(done);
}).error(done);
}).error(done);
}).error(done);
});
it('If transaction A incs an object and does not commit, transaction B still see the old version of the object, when A commits, B sees the new version',
function (done)
{
var obj= { _id: 'update2', n: 0 };
db.test.save(obj).success(function ()
{
db.transaction().transaction(function (A)
{
db.transaction().transaction(function (B)
{
A.test.update({},{ $inc: { n: 1 } }).success(function ()
{
B.test.findOne({ _id: 'update2' })
.result(function (copy)
{
copy.n.should.equal(0);
A.test.findOne({ _id: 'update2' })
.result(function (copy)
{
copy.n.should.equal(1);
A.commit().committed(function ()
{
B.test.findOne({ _id: 'update2' })
.result(function (copy)
{
copy.n.should.equal(1);
done();
})
.error(done);
})
.error(done);
})
.error(done);
})
.error(done);
}).error(done);
}).error(done);
}).error(done);
}).error(done);
});
it('When some object is updated more than one time the original copy is rolled back',function (done)
{
db.test.save({ _id: 'update-orig', n: 1 })
.success(function ()
{
db.transaction().transaction(function (tx)
{
tx.test.findOne({ _id: 'update-orig' })
.result(function (obj)
{
obj.n++;
tx.test.save(obj)
.success(function ()
{
obj.n++;
tx.test.save(obj)
.success(function ()
{
tx.rollback().rolledback(function ()
{
db.test.findOne({ _id: 'update-orig' })
.result(function (obj)
{
obj.n.should.equal(1);
done();
})
.error(done);
})
.error(done);
})
.error(done);
})
.error(done);
})
.error(done);
})
.error(done);
})
.error(done);
});
});
describe('query',function ()
{
it('If transaction A inserts an item without committing, transaction B should not see the inserted item until commited',
function (done)
{
var items= _.collect(_.range(10),function (n) { return { _id: 'item'+n, n: n+1 } });
db.test.save(items).success(function ()
{
db.transaction().transaction(function (A)
{
db.transaction().transaction(function (B)
{
A.test.save({ _id: 'itemS', n: 0 }).success(function ()
{
B.test.find().sort({ n: 1 }).limit(3)
.results(function (objs)
{
objs[0].n.should.equal(1);
objs.length.should.equal(3);
})
.error(done)
.end(function ()
{
A.test.find().sort({ n: 1 }).limit(3)
.results(function (objs)
{
objs[0].n.should.equal(0);
objs.length.should.equal(3);
})
.error(done)
.end(function ()
{
A.commit().committed(function ()
{
B.test.find().sort({ n: 1 }).limit(3)
.results(function (objs)
{
objs[0].n.should.equal(0);
objs.length.should.equal(3);
})
.error(done)
.end(done);
});
});
});
}).error(done);
});
});
});
});
});
describe('concurrency',function ()
{
it('rollsback competing transaction',
function (done)
{
db.test.save({ _id: 'hot', name: 'Hot' }).success(function ()
{
db.transaction().transaction(function (A)
{
db.transaction().transaction(function (B)
{
A.test.findOne({ _id: 'hot' })
.result(function (hotA)
{
hotA.name= 'HotA';
B.test.findOne({ _id: 'hot' })
.result(function (hotB)
{
hotB.name= 'HotB';
A.test.save(hotA).success(function ()
{
B.test.save(hotB).success(function ()
{
var committedA= chai.spy();
A.commit()
.committed(committedA)
.error(function (err)
{
if (err.code=='rolledback')
B.commit().committed(function ()
{
db.test.findOne({ _id: 'hot' })
.result(function (obj)
{
committedA.should.not.have.been.called();
obj.name.should.equal('HotB');
done();
})
.error(done);
})
.error(done);
else
done(err);
});
})
.error(done);
})
.error(done);
})
.error(done);
})
.error(done);
}).error(done);
}).error(done);
}).error(done);
});
});
});