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// Basic tests for resuming a $changeStream that is open against all databases in a cluster.
(function() {
"use strict";
load("jstests/libs/collection_drop_recreate.js"); // For assert[Drop|Create]Collection.
load("jstests/libs/change_stream_util.js"); // For ChangeStreamTest.
load("jstests/libs/fixture_helpers.js"); // For FixtureHelpers.
// Create two databases, with one collection in each.
const testDBs = [db.getSiblingDB(jsTestName()), db.getSiblingDB(jsTestName() + "_other")];
let [db1Coll, db2Coll] = testDBs.map((db) => assertDropAndRecreateCollection(db, "test"));
const adminDB = db.getSiblingDB("admin");
let cst = new ChangeStreamTest(adminDB);
let resumeCursor = cst.startWatchingAllChangesForCluster();
// Insert a document in the first database and save the resulting change stream.
assert.writeOK(db1Coll.insert({_id: 1}));
const firstInsertChangeDoc = cst.getOneChange(resumeCursor);
assert.docEq(firstInsertChangeDoc.fullDocument, {_id: 1});
// Test resume after the first insert.
resumeCursor = cst.startWatchingChanges({
pipeline:
[{$changeStream: {resumeAfter: firstInsertChangeDoc._id, allChangesForCluster: true}}],
collection: 1,
aggregateOptions: {cursor: {batchSize: 0}},
});
// Write the next document into the second database.
assert.writeOK(db2Coll.insert({_id: 2}));
const secondInsertChangeDoc = cst.getOneChange(resumeCursor);
assert.docEq(secondInsertChangeDoc.fullDocument, {_id: 2});
// Write the third document into the first database again.
assert.writeOK(db1Coll.insert({_id: 3}));
const thirdInsertChangeDoc = cst.getOneChange(resumeCursor);
assert.docEq(thirdInsertChangeDoc.fullDocument, {_id: 3});
// Test resuming after the first insert again.
resumeCursor = cst.startWatchingChanges({
pipeline:
[{$changeStream: {resumeAfter: firstInsertChangeDoc._id, allChangesForCluster: true}}],
collection: 1,
aggregateOptions: {cursor: {batchSize: 0}},
});
assert.docEq(cst.getOneChange(resumeCursor), secondInsertChangeDoc);
assert.docEq(cst.getOneChange(resumeCursor), thirdInsertChangeDoc);
// Test resume after second insert.
resumeCursor = cst.startWatchingChanges({
pipeline:
[{$changeStream: {resumeAfter: secondInsertChangeDoc._id, allChangesForCluster: true}}],
collection: 1,
aggregateOptions: {cursor: {batchSize: 0}},
});
assert.docEq(cst.getOneChange(resumeCursor), thirdInsertChangeDoc);
// Rename the collection and obtain a resume token from the 'rename' notification. Skip this
// test when running on a sharded collection, since these cannot be renamed.
if (!FixtureHelpers.isSharded(db1Coll)) {
assertDropAndRecreateCollection(db1Coll.getDB(), db1Coll.getName());
const renameColl = db1Coll.getDB().getCollection("rename_coll");
assertDropCollection(renameColl.getDB(), renameColl.getName());
resumeCursor = cst.startWatchingChanges({
collection: 1,
pipeline: [{$changeStream: {allChangesForCluster: true}}],
aggregateOptions: {cursor: {batchSize: 0}}
});
assert.writeOK(db1Coll.renameCollection(renameColl.getName()));
const renameChanges = cst.assertNextChangesEqual({
cursor: resumeCursor,
expectedChanges: [
{
operationType: "rename",
ns: {db: db1Coll.getDB().getName(), coll: db1Coll.getName()},
to: {db: renameColl.getDB().getName(), coll: renameColl.getName()}
},
]
});
const resumeTokenRename = renameChanges[0]._id;
// Insert into the renamed collection.
assert.writeOK(renameColl.insert({_id: "after rename"}));
// Resume from the rename notification using 'resumeAfter' and verify that the change stream
// returns the next insert.
let expectedInsert = {
operationType: "insert",
ns: {db: renameColl.getDB().getName(), coll: renameColl.getName()},
fullDocument: {_id: "after rename"},
documentKey: {_id: "after rename"}
};
resumeCursor = cst.startWatchingChanges({
collection: 1,
pipeline:
[{$changeStream: {resumeAfter: resumeTokenRename, allChangesForCluster: true}}],
aggregateOptions: {cursor: {batchSize: 0}}
});
cst.assertNextChangesEqual({cursor: resumeCursor, expectedChanges: expectedInsert});
// Resume from the rename notification using 'startAfter' and verify that the change stream
// returns the next insert.
expectedInsert = {
operationType: "insert",
ns: {db: renameColl.getDB().getName(), coll: renameColl.getName()},
fullDocument: {_id: "after rename"},
documentKey: {_id: "after rename"}
};
resumeCursor = cst.startWatchingChanges({
collection: 1,
pipeline:
[{$changeStream: {startAfter: resumeTokenRename, allChangesForCluster: true}}],
aggregateOptions: {cursor: {batchSize: 0}}
});
cst.assertNextChangesEqual({cursor: resumeCursor, expectedChanges: expectedInsert});
// Rename back to the original collection for reliability of the collection drops when
// dropping the database.
assert.writeOK(renameColl.renameCollection(db1Coll.getName()));
}
// Dropping a database should generate a 'drop' notification for the collection followed by a
// 'dropDatabase' notification.
resumeCursor = cst.startWatchingAllChangesForCluster();
assert.commandWorked(testDBs[0].dropDatabase());
const dropDbChanges = cst.assertDatabaseDrop({cursor: resumeCursor, db: testDBs[0]});
const resumeTokenDbDrop = dropDbChanges[dropDbChanges.length - 1]._id;
// Recreate the collection and insert a document.
assert.writeOK(db1Coll.insert({_id: "after recreate"}));
let expectedInsert = {
operationType: "insert",
ns: {db: testDBs[0].getName(), coll: db1Coll.getName()},
fullDocument: {_id: "after recreate"},
documentKey: {_id: "after recreate"}
};
// Resume from the database drop using 'resumeAfter', and verify the change stream picks up
// the insert.
resumeCursor = cst.startWatchingChanges({
collection: 1,
pipeline: [{$changeStream: {resumeAfter: resumeTokenDbDrop, allChangesForCluster: true}}],
aggregateOptions: {cursor: {batchSize: 0}}
});
cst.consumeDropUpTo({
cursor: resumeCursor,
dropType: "dropDatabase",
expectedNext: expectedInsert,
});
// Resume from the database drop using 'startAfter', and verify the change stream picks up the
// insert.
resumeCursor = cst.startWatchingChanges({
collection: 1,
pipeline: [{$changeStream: {startAfter: resumeTokenDbDrop, allChangesForCluster: true}}],
aggregateOptions: {cursor: {batchSize: 0}}
});
cst.consumeDropUpTo({
cursor: resumeCursor,
dropType: "dropDatabase",
expectedNext: expectedInsert,
});
cst.cleanUp();
})();
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