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// Basic $changeStream tests.
(function() {
"use strict";
load("jstests/libs/change_stream_util.js");
load('jstests/libs/uuid_util.js');
let cst = new ChangeStreamTest(db);
jsTestLog("Testing single insert");
db.t1.drop();
let cursor = cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: db.t1});
// Test that if there are no changes, we return an empty batch.
assert.eq(0, cursor.firstBatch.length, "Cursor had changes: " + tojson(cursor));
assert.writeOK(db.t1.insert({_id: 0, a: 1}));
const t1Uuid = getUUIDFromListCollections(db, db.t1.getName());
let expected = {
documentKey: {_id: 0},
fullDocument: {_id: 0, a: 1},
ns: {db: "test", coll: "t1"},
operationType: "insert",
};
cst.assertNextChangesEqual({cursor: cursor, expectedChanges: [expected]});
// Test that if there are no changes during a subsequent 'getMore', we return an empty batch.
cursor = cst.getNextBatch(cursor);
assert.eq(0, cursor.nextBatch.length, "Cursor had changes: " + tojson(cursor));
jsTestLog("Testing second insert");
cursor = cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: db.t1});
assert.writeOK(db.t1.insert({_id: 1, a: 2}));
expected = {
documentKey: {_id: 1},
fullDocument: {_id: 1, a: 2},
ns: {db: "test", coll: "t1"},
operationType: "insert",
};
cst.assertNextChangesEqual({cursor: cursor, expectedChanges: [expected]});
jsTestLog("Testing update");
cursor = cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: db.t1});
assert.writeOK(db.t1.update({_id: 0}, {a: 3}));
expected = {
documentKey: {_id: 0},
fullDocument: {_id: 0, a: 3},
ns: {db: "test", coll: "t1"},
operationType: "replace",
};
cst.assertNextChangesEqual({cursor: cursor, expectedChanges: [expected]});
jsTestLog("Testing update of another field");
cursor = cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: db.t1});
assert.writeOK(db.t1.update({_id: 0}, {b: 3}));
expected = {
documentKey: {_id: 0},
fullDocument: {_id: 0, b: 3},
ns: {db: "test", coll: "t1"},
operationType: "replace",
};
cst.assertNextChangesEqual({cursor: cursor, expectedChanges: [expected]});
jsTestLog("Testing upsert");
cursor = cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: db.t1});
assert.writeOK(db.t1.update({_id: 2}, {a: 4}, {upsert: true}));
expected = {
documentKey: {_id: 2},
fullDocument: {_id: 2, a: 4},
ns: {db: "test", coll: "t1"},
operationType: "insert",
};
cst.assertNextChangesEqual({cursor: cursor, expectedChanges: [expected]});
jsTestLog("Testing partial update with $inc");
assert.writeOK(db.t1.insert({_id: 3, a: 5, b: 1}));
cursor = cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: db.t1});
assert.writeOK(db.t1.update({_id: 3}, {$inc: {b: 2}}));
expected = {
documentKey: {_id: 3},
ns: {db: "test", coll: "t1"},
operationType: "update",
updateDescription: {removedFields: [], updatedFields: {b: 3}},
};
cst.assertNextChangesEqual({cursor: cursor, expectedChanges: [expected]});
jsTestLog("Testing delete");
cursor = cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: db.t1});
assert.writeOK(db.t1.remove({_id: 1}));
expected = {
documentKey: {_id: 1},
ns: {db: "test", coll: "t1"},
operationType: "delete",
};
cst.assertNextChangesEqual({cursor: cursor, expectedChanges: [expected]});
jsTestLog("Testing intervening write on another collection");
cursor = cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: db.t1});
let t2cursor = cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: db.t2});
assert.writeOK(db.t2.insert({_id: 100, c: 1}));
const t2Uuid = getUUIDFromListCollections(db, db.t2.getName());
cst.assertNextChangesEqual({cursor: cursor, expectedChanges: []});
expected = {
documentKey: {_id: 100},
fullDocument: {_id: 100, c: 1},
ns: {db: "test", coll: "t2"},
operationType: "insert",
};
cst.assertNextChangesEqual({cursor: t2cursor, expectedChanges: [expected]});
jsTestLog("Testing drop of unrelated collection");
assert.writeOK(db.dropping.insert({}));
db.dropping.drop();
// Should still see the previous change from t2, shouldn't see anything about 'dropping'.
jsTestLog("Testing rename");
db.t3.drop();
t2cursor = cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: db.t2});
assert.writeOK(db.t2.renameCollection("t3"));
expected = {operationType: "invalidate"};
cst.assertNextChangesEqual(
{cursor: t2cursor, expectedChanges: [expected], expectInvalidate: true});
jsTestLog("Testing insert that looks like rename");
db.dne1.drop();
db.dne2.drop();
const dne1cursor =
cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: db.dne1});
const dne2cursor =
cst.startWatchingChanges({pipeline: [{$changeStream: {}}], collection: db.dne2});
assert.writeOK(db.t3.insert({_id: 101, renameCollection: "test.dne1", to: "test.dne2"}));
cst.assertNextChangesEqual({cursor: dne1cursor, expectedChanges: []});
cst.assertNextChangesEqual({cursor: dne2cursor, expectedChanges: []});
const isMongos = db.runCommand({isdbgrid: 1}).isdbgrid;
if (!isMongos) {
jsTestLog("Ensuring attempt to read with legacy operations fails.");
db.getMongo().forceReadMode('legacy');
const legacyCursor = db.tailable2.aggregate([{$changeStream: {}}, cst.oplogProjection],
{cursor: {batchSize: 0}});
assert.throws(function() {
legacyCursor.next();
}, [], "Legacy getMore expected to fail on changeStream cursor.");
db.getMongo().forceReadMode('commands');
}
jsTestLog("Testing resumability");
db.resume1.drop();
assert.commandWorked(db.createCollection("resume1"));
// Note we do not project away 'id.ts' as it is part of the resume token.
let resumeCursor = cst.startWatchingChanges(
{pipeline: [{$changeStream: {}}], collection: db.resume1, includeToken: true});
// Insert a document and save the resulting change stream.
assert.writeOK(db.resume1.insert({_id: 1}));
const firstInsertChangeDoc = cst.getOneChange(resumeCursor);
assert.docEq(firstInsertChangeDoc.fullDocument, {_id: 1});
jsTestLog("Testing resume after one document.");
resumeCursor = cst.startWatchingChanges({
pipeline: [{$changeStream: {resumeAfter: firstInsertChangeDoc._id}}],
collection: db.resume1,
includeToken: true,
aggregateOptions: {cursor: {batchSize: 0}},
});
jsTestLog("Inserting additional documents.");
assert.writeOK(db.resume1.insert({_id: 2}));
const secondInsertChangeDoc = cst.getOneChange(resumeCursor);
assert.docEq(secondInsertChangeDoc.fullDocument, {_id: 2});
assert.writeOK(db.resume1.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: [{$changeStream: {resumeAfter: firstInsertChangeDoc._id}}],
collection: db.resume1,
includeToken: true,
aggregateOptions: {cursor: {batchSize: 0}},
});
assert.docEq(cst.getOneChange(resumeCursor), secondInsertChangeDoc);
assert.docEq(cst.getOneChange(resumeCursor), thirdInsertChangeDoc);
jsTestLog("Testing resume after second document of three.");
resumeCursor = cst.startWatchingChanges({
pipeline: [{$changeStream: {resumeAfter: secondInsertChangeDoc._id}}],
collection: db.resume1,
includeToken: true,
aggregateOptions: {cursor: {batchSize: 0}},
});
assert.docEq(cst.getOneChange(resumeCursor), thirdInsertChangeDoc);
cst.cleanUp();
}());
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