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// Tests the ability to resume a change stream at different points in the stream.
// @tags: [uses_resume_after]
(function() {
"use strict";
load("jstests/libs/collection_drop_recreate.js"); // For assert[Drop|Create]Collection.
load("jstests/libs/change_stream_util.js");
let cst = new ChangeStreamTest(db);
assertDropAndRecreateCollection(db, "resume_after");
// Note we do not project away 'id.ts' as it is part of the resume token.
let resumeCursor = cst.startWatchingChanges(
{pipeline: [{$changeStream: {}}], collection: db.resume_after, includeToken: true});
// Insert a document and save the resulting change stream.
assert.writeOK(db.resume_after.insert({_id: 1}));
const firstInsertChangeDoc = cst.getOneChange(resumeCursor);
assert.docEq(firstInsertChangeDoc.fullDocument, {_id: 1});
jsTestLog("Testing resume after one document.");
resumeCursor = cst.startWatchingChanges({
pipeline: [{$changeStream: {resumeAfter: firstInsertChangeDoc._id}}],
collection: db.resume_after,
includeToken: true,
aggregateOptions: {cursor: {batchSize: 0}},
});
jsTestLog("Inserting additional documents.");
assert.writeOK(db.resume_after.insert({_id: 2}));
const secondInsertChangeDoc = cst.getOneChange(resumeCursor);
assert.docEq(secondInsertChangeDoc.fullDocument, {_id: 2});
assert.writeOK(db.resume_after.insert({_id: 3}));
const thirdInsertChangeDoc = cst.getOneChange(resumeCursor);
assert.docEq(thirdInsertChangeDoc.fullDocument, {_id: 3});
jsTestLog("Testing resume after first document of three.");
resumeCursor = cst.startWatchingChanges({
pipeline: [{$changeStream: {resumeAfter: firstInsertChangeDoc._id}}],
collection: db.resume_after,
includeToken: true,
aggregateOptions: {cursor: {batchSize: 0}},
});
assert.docEq(cst.getOneChange(resumeCursor), secondInsertChangeDoc);
assert.docEq(cst.getOneChange(resumeCursor), thirdInsertChangeDoc);
jsTestLog("Testing resume after second document of three.");
resumeCursor = cst.startWatchingChanges({
pipeline: [{$changeStream: {resumeAfter: secondInsertChangeDoc._id}}],
collection: db.resume_after,
includeToken: true,
aggregateOptions: {cursor: {batchSize: 0}},
});
assert.docEq(cst.getOneChange(resumeCursor), thirdInsertChangeDoc);
cst.cleanUp();
}());
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