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datastore: the changes
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+40
-91
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4 files changed

+40
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lines changed

‎lib/common/stream-router.js

Lines changed: 3 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -94,18 +94,14 @@ streamRouter.parseArguments_ = function(args) {
9494
if (is.number(query.maxResults)) {
9595
// `maxResults` is used API-wide.
9696
maxResults = query.maxResults;
97-
} else if (is.number(query.limitVal)) {
98-
// `limitVal` is part of a Datastore query.
99-
maxResults = query.limitVal;
10097
} else if (is.number(query.pageSize)) {
10198
// `pageSize` is Pub/Sub's `maxResults`.
10299
maxResults = query.pageSize;
103100
}
104101

105102
if (callback &&
106103
(maxResults !== -1 || // The user specified a limit.
107-
query.autoPaginate === false ||
108-
query.autoPaginateVal === false)) {
104+
query.autoPaginate === false)) {
109105
autoPaginate = false;
110106
}
111107
}
@@ -159,8 +155,8 @@ streamRouter.router_ = function(parsedArguments, originalMethod) {
159155
* This method simply calls the nextQuery recursively, emitting results to a
160156
* stream. The stream ends when `nextQuery` is null.
161157
*
162-
* `maxResults` and `limitVal` (from Datastore) will act as a cap for how many
163-
* results are fetched and emitted to the stream.
158+
* `maxResults` will act as a cap for how many results are fetched and emitted
159+
* to the stream.
164160
*
165161
* @param {object=|string=} parsedArguments.query - Query object. This is most
166162
* commonly an object, but to make the API more simple, it can also be a

‎lib/datastore/query.js

Lines changed: 0 additions & 29 deletions
Original file line numberDiff line numberDiff line change
@@ -67,41 +67,12 @@ function Query(scope, namespace, kinds) {
6767
this.selectVal = [];
6868

6969
// pagination
70-
this.autoPaginateVal = true;
7170
this.startVal = null;
7271
this.endVal = null;
7372
this.limitVal = -1;
7473
this.offsetVal = -1;
7574
}
7675

77-
/**
78-
* @param {boolean=} autoPaginateVal - Have pagination handled automatically.
79-
* Default: true.
80-
* @return {module:datastore/query}
81-
*
82-
* @example
83-
* //-
84-
* // Retrieve a list of people related to "Dave", with auto-pagination
85-
* // disabled.
86-
* //-
87-
* var query = datastore.createQuery('Person')
88-
* .hasAncestor(datastore.key(['Person', 'Dave']))
89-
* .autoPaginate(false);
90-
*
91-
* function callback(err, entities, nextQuery, apiResponse) {
92-
* if (nextQuery) {
93-
* // More results might exist, so we'll manually fetch them.
94-
* datastore.runQuery(nextQuery, callback);
95-
* }
96-
* }
97-
*
98-
* datastore.runQuery(query, callback);
99-
*/
100-
Query.prototype.autoPaginate = function(autoPaginateVal) {
101-
this.autoPaginateVal = autoPaginateVal !== false;
102-
return this;
103-
};
104-
10576
/**
10677
* Datastore allows querying on properties. Supported comparison operators
10778
* are `=`, `<`, `>`, `<=`, and `>=`. "Not equal" and `IN` operators are

‎lib/datastore/request.js

Lines changed: 16 additions & 37 deletions
Original file line numberDiff line numberDiff line change
@@ -40,12 +40,6 @@ var entity = require('./entity.js');
4040
*/
4141
var Query = require('./query.js');
4242

43-
/**
44-
* @type {module:common/stream-router}
45-
* @private
46-
*/
47-
var streamRouter = require('../common/stream-router.js');
48-
4943
/**
5044
* @type {module:common/util}
5145
* @private
@@ -489,7 +483,6 @@ DatastoreRequest.prototype.runQuery = function(query, options, callback) {
489483
};
490484
}
491485

492-
var originalLimitVal = query.limitVal;
493486
var entities = [];
494487

495488
function onResponse(err, resp) {
@@ -498,43 +491,36 @@ DatastoreRequest.prototype.runQuery = function(query, options, callback) {
498491
return;
499492
}
500493

501-
var nextQuery = null;
502-
503494
if (resp.batch.entityResults) {
504495
entities = entities.concat(entity.formatArray(resp.batch.entityResults));
505496
}
506497

507-
var notFinished = resp.batch.moreResults === 'NOT_FINISHED';
508-
var moreResults = resp.batch.moreResults === 'MORE_RESULTS_AFTER_LIMIT';
498+
var info = {
499+
moreResults: resp.batch.moreResults
500+
};
509501

510-
if (notFinished || moreResults) {
511-
var endCursor = resp.batch.endCursor;
512-
var offset = query.offsetVal === -1 ? 0 : query.offsetVal;
513-
var nextOffset = offset - resp.batch.skippedResults;
514-
nextQuery = extend(true, new Query(), query);
515-
nextQuery.start(endCursor.toString('base64')).offset(nextOffset);
502+
if (resp.batch.endCursor) {
503+
info.endCursor = resp.batch.endCursor;
516504
}
517505

518-
if (notFinished) {
519-
// Run the query again to make sure all of the requested entities are
520-
// returned.
506+
if (resp.batch.moreResults === 'NOT_FINISHED') {
507+
var offset = query.offsetVal === -1 ? 0 : query.offsetVal;
508+
509+
var continuationQuery = extend(true, new Query(), query)
510+
.start(info.endCursor)
511+
.offset(offset - resp.batch.skippedResults);
512+
521513
var limit = reqOpts.query.limit && reqOpts.query.limit.value;
522514
if (limit && limit > -1) {
523-
// Update the limit on the nextQuery to return only the amount of
524-
// results originally asked for.
525-
nextQuery.limit(limit - resp.batch.entityResults.length);
515+
continuationQuery.limit(limit - resp.batch.entityResults.length);
526516
}
527-
reqOpts.query = entity.queryToQueryProto(nextQuery);
517+
518+
reqOpts.query = entity.queryToQueryProto(continuationQuery);
528519
self.request_(protoOpts, reqOpts, onResponse);
529520
return;
530521
}
531522

532-
if (nextQuery && originalLimitVal > -1) {
533-
// Restore the original limit value for the query.
534-
nextQuery.limit(originalLimitVal);
535-
}
536-
537-
callback(null, entities, nextQuery, resp);
523+
callback(null, entities, info, resp);
538524
}
539525

540526
this.request_(protoOpts, reqOpts, onResponse);
@@ -880,11 +866,4 @@ DatastoreRequest.prototype.request_ = function(protoOpts, reqOpts, callback) {
880866
this.request(protoOpts, reqOpts, callback);
881867
};
882868

883-
/*! Developer Documentation
884-
*
885-
* This method can be used with either a callback or as a readable object
886-
* stream. `streamRouter` is used to add this dual behavior.
887-
*/
888-
streamRouter.extend(DatastoreRequest, 'runQuery');
889-
890869
module.exports = DatastoreRequest;

‎system-test/datastore.js

Lines changed: 21 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -23,7 +23,7 @@ var env = require('./env.js');
2323
var Datastore = require('../lib/datastore/index.js');
2424
var entity = require('../lib/datastore/entity.js');
2525

26-
describe('Datastore', function() {
26+
describe.only('Datastore', function() {
2727
var testKinds = [];
2828
var datastore = new Datastore(env);
2929

@@ -431,19 +431,19 @@ describe('Datastore', function() {
431431
});
432432

433433
it('should limit queries', function(done) {
434-
var firstQ = datastore.createQuery('Character')
434+
var q = datastore.createQuery('Character')
435435
.hasAncestor(ancestor)
436-
.limit(5)
437-
.autoPaginate(false);
436+
.limit(5);
438437

439-
datastore.runQuery(firstQ, function(err, firstEntities, secondQ) {
438+
datastore.runQuery(q, function(err, firstEntities, info) {
440439
assert.ifError(err);
441440
assert.strictEqual(firstEntities.length, 5);
442441

443-
datastore.runQuery(secondQ, function(err, secondEntities, thirdQ) {
442+
q.start(info.endCursor).limit(q.limitVal - firstEntities.length);
443+
444+
datastore.runQuery(q, function(err, secondEntities) {
444445
assert.ifError(err);
445446
assert.strictEqual(secondEntities.length, 3);
446-
assert.strictEqual(thirdQ, null);
447447
done();
448448
});
449449
});
@@ -462,7 +462,7 @@ describe('Datastore', function() {
462462
});
463463
});
464464

465-
it('should run a query as a stream', function(done) {
465+
it.skip('should run a query as a stream', function(done) {
466466
var q = datastore.createQuery('Character').hasAncestor(ancestor);
467467

468468
var resultsReturned = 0;
@@ -476,7 +476,7 @@ describe('Datastore', function() {
476476
});
477477
});
478478

479-
it('should not go over a limit with a stream', function(done) {
479+
it.skip('should not go over a limit with a stream', function(done) {
480480
var limit = 3;
481481
var q = datastore.createQuery('Character')
482482
.hasAncestor(ancestor)
@@ -584,18 +584,20 @@ describe('Datastore', function() {
584584
.hasAncestor(ancestor)
585585
.offset(2)
586586
.limit(3)
587-
.order('appearances')
588-
.autoPaginate(false);
587+
.order('appearances');
589588

590-
datastore.runQuery(q, function(err, entities, secondQuery) {
589+
datastore.runQuery(q, function(err, entities, info) {
591590
assert.ifError(err);
592591

593592
assert.strictEqual(entities.length, 3);
594593
assert.strictEqual(entities[0].data.name, 'Robb');
595594
assert.strictEqual(entities[2].data.name, 'Catelyn');
596595

597-
var offsetQuery = secondQuery.offset(0);
598-
datastore.runQuery(offsetQuery, function(err, secondEntities) {
596+
q.start(info.endCursor)
597+
.limit(q.limitVal - entities.length)
598+
.offset(0);
599+
600+
datastore.runQuery(q, function(err, secondEntities) {
599601
assert.ifError(err);
600602

601603
assert.strictEqual(secondEntities.length, 3);
@@ -612,13 +614,14 @@ describe('Datastore', function() {
612614
.hasAncestor(ancestor)
613615
.offset(2)
614616
.limit(2)
615-
.order('appearances')
616-
.autoPaginate(false);
617+
.order('appearances');
617618

618-
datastore.runQuery(q, function(err, entities, nextQuery) {
619+
datastore.runQuery(q, function(err, entities, info) {
619620
assert.ifError(err);
620621

621-
datastore.runQuery(nextQuery.limit(-1), function(err, secondEntities) {
622+
q.start(info.endCursor).limit(-1).offset(-1);
623+
624+
datastore.runQuery(q, function(err, secondEntities, info) {
622625
assert.ifError(err);
623626

624627
assert.strictEqual(secondEntities.length, 4);

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