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// Test change streams related shell helpers and options passed to them. Note that, while we only
// call the DBCollection.watch helper in this file, it will be redirected to the DB.watch or
// Mongo.watch equivalents in the whole_db and whole_cluster passthroughs.
//
// This test expects each change stream result to have an operationTime based on the clusterTime in
// the oplog entry. When operations get bundled into a transaction, their operationTime is instead
// based on the commit oplog entry, which would cause this test to fail.
// @tags: [change_stream_does_not_expect_txns]
(function() {
"use strict";
load("jstests/libs/collection_drop_recreate.js"); // For assert[Drop|Create]Collection.
load("jstests/libs/fixture_helpers.js"); // For FixtureHelpers.
load("jstests/libs/change_stream_util.js"); // For assertInvalidateOp.
const coll = assertDropAndRecreateCollection(db, "change_stream_shell_helper");
function checkNextChange(cursor, expected) {
assert.soon(() => cursor.hasNext());
const nextObj = cursor.next();
assertChangeStreamEventEq(nextObj, expected);
return nextObj;
}
function testCommandIsCalled(testFunc, checkFunc) {
const mongoRunCommandOriginal = Mongo.prototype.runCommand;
const sentinel = {};
let cmdObjSeen = sentinel;
Mongo.prototype.runCommand = function runCommandSpy(dbName, cmdObj, options) {
cmdObjSeen = cmdObj;
return mongoRunCommandOriginal.apply(this, arguments);
};
try {
assert.doesNotThrow(testFunc);
} finally {
Mongo.prototype.runCommand = mongoRunCommandOriginal;
}
if (cmdObjSeen === sentinel) {
throw new Error("Mongo.prototype.runCommand() was never called: " +
testFunc.toString());
}
checkFunc(cmdObjSeen);
}
jsTestLog("Testing watch() without options");
let changeStreamCursor = coll.watch();
assert(!changeStreamCursor.hasNext());
// Write the first document into the collection. We will save the resume token from this change.
assert.writeOK(coll.insert({_id: 0, x: 1}));
let resumeToken;
// Test that each of the change stream cursors picks up the change.
assert.soon(() => changeStreamCursor.hasNext());
let change = changeStreamCursor.next();
assert(!changeStreamCursor.hasNext());
let expected = {
documentKey: {_id: 0},
fullDocument: {_id: 0, x: 1},
ns: {db: "test", coll: coll.getName()},
operationType: "insert",
};
assert("_id" in change, "Got unexpected change: " + tojson(change));
// Remember the _id of the first op to resume the stream.
resumeToken = change._id;
// Remove the fields we cannot predict, then test that the change is as expected.
delete change._id;
delete change.clusterTime;
assert.docEq(change, expected);
jsTestLog("Testing watch() with pipeline");
changeStreamCursor = coll.watch([{$project: {clusterTime: 1, docId: "$documentKey._id"}}]);
// Store the cluster time of the insert as the timestamp to start from.
const resumeTime =
assert.commandWorked(db.runCommand({insert: coll.getName(), documents: [{_id: 1, x: 1}]}))
.operationTime;
jsTestLog("Insert of document with _id 1 got operationTime " + tojson(resumeTime));
const changeForInsert = checkNextChange(changeStreamCursor, {docId: 1});
jsTestLog("Change stream event for document with _id 1 reports clusterTime " +
tojson(changeForInsert.clusterTime));
// We expect the clusterTime returned by the change stream event and the operationTime returned
// by the insert to be the same.
assert.eq(changeForInsert.clusterTime, resumeTime);
jsTestLog("Testing watch() with pipeline and resumeAfter");
changeStreamCursor =
coll.watch([{$project: {docId: "$documentKey._id"}}], {resumeAfter: resumeToken});
checkNextChange(changeStreamCursor, {docId: 1});
jsTestLog("Testing watch() with pipeline and startAfter");
changeStreamCursor =
coll.watch([{$project: {docId: "$documentKey._id"}}], {startAfter: resumeToken});
checkNextChange(changeStreamCursor, {docId: 1});
jsTestLog("Testing watch() with pipeline and startAtOperationTime");
changeStreamCursor =
coll.watch([{$project: {docId: "$documentKey._id"}}], {startAtOperationTime: resumeTime});
checkNextChange(changeStreamCursor, {docId: 1});
jsTestLog("Testing watch() with updateLookup");
changeStreamCursor = coll.watch([], {fullDocument: "updateLookup"});
assert.writeOK(coll.update({_id: 0}, {$set: {x: 10}}));
expected = {
documentKey: {_id: 0},
fullDocument: {_id: 0, x: 10},
ns: {db: "test", coll: coll.getName()},
operationType: "update",
updateDescription: {removedFields: [], updatedFields: {x: 10}},
};
checkNextChange(changeStreamCursor, expected);
jsTestLog("Testing watch() with batchSize");
// Only test mongod because mongos uses batch size 0 for aggregate commands internally to
// establish cursors quickly. GetMore on mongos doesn't respect batch size due to SERVER-31992.
const isMongos = FixtureHelpers.isMongos(db);
if (!isMongos) {
// Increase a field by 5 times and verify the batch size is respected.
for (let i = 0; i < 5; i++) {
assert.writeOK(coll.update({_id: 1}, {$inc: {x: 1}}));
}
// Only watch the "update" changes of the specific doc since the beginning.
changeStreamCursor =
coll.watch([{$match: {documentKey: {_id: 1}, operationType: "update"}}],
{resumeAfter: resumeToken, batchSize: 2});
// Check the first batch.
assert.eq(changeStreamCursor.objsLeftInBatch(), 2);
// Consume the first batch.
assert(changeStreamCursor.hasNext());
changeStreamCursor.next();
assert(changeStreamCursor.hasNext());
changeStreamCursor.next();
// Confirm that the batch is empty.
assert.eq(changeStreamCursor.objsLeftInBatch(), 0);
// Check the batch returned by getMore.
assert(changeStreamCursor.hasNext());
assert.eq(changeStreamCursor.objsLeftInBatch(), 2);
changeStreamCursor.next();
assert(changeStreamCursor.hasNext());
changeStreamCursor.next();
assert.eq(changeStreamCursor.objsLeftInBatch(), 0);
// There are more changes coming, just not in the batch.
assert(changeStreamCursor.hasNext());
}
jsTestLog("Testing watch() with maxAwaitTimeMS");
changeStreamCursor = coll.watch([], {maxAwaitTimeMS: 500});
testCommandIsCalled(() => assert(!changeStreamCursor.hasNext()), (cmdObj) => {
assert.eq("getMore",
Object.keys(cmdObj)[0],
"expected getMore command, but was: " + tojson(cmdObj));
assert(cmdObj.hasOwnProperty("maxTimeMS"), "unexpected getMore command: " + tojson(cmdObj));
assert.eq(500, cmdObj.maxTimeMS, "unexpected getMore command: " + tojson(cmdObj));
});
jsTestLog("Testing the cursor gets closed when the collection gets dropped");
changeStreamCursor = coll.watch([{$project: {clusterTime: 0}}]);
assert.writeOK(coll.insert({_id: 2, x: 1}));
expected = {
documentKey: {_id: 2},
fullDocument: {_id: 2, x: 1},
ns: {db: "test", coll: coll.getName()},
operationType: "insert",
};
checkNextChange(changeStreamCursor, expected);
assert(!changeStreamCursor.hasNext());
assert(!changeStreamCursor.isClosed());
assert(!changeStreamCursor.isExhausted());
// Dropping the collection should trigger a drop notification.
assertDropCollection(db, coll.getName());
assert.soon(() => changeStreamCursor.hasNext());
assert(!changeStreamCursor.isExhausted());
expected = {operationType: "drop", ns: {db: db.getName(), coll: coll.getName()}};
checkNextChange(changeStreamCursor, expected);
// For single collection change streams, the drop should invalidate the stream.
const invalidateDoc = assertInvalidateOp({cursor: changeStreamCursor, opType: "drop"});
if (invalidateDoc) {
jsTestLog("Testing using the 'startAfter' option from the invalidate entry");
assert.commandWorked(coll.insert({_id: "After drop"}));
let resumedFromInvalidate =
coll.watch([], {startAfter: invalidateDoc._id, collation: {locale: "simple"}});
// We should see the new insert after starting over. However, in sharded cluster
// passthroughs we may see more drop and invalidate notifications before we see the insert.
let firstChangeAfterDrop;
assert.soon(() => {
if (!resumedFromInvalidate.hasNext()) {
return false;
}
const next = resumedFromInvalidate.next();
if (next.operationType == "invalidate") {
// Start again!
resumedFromInvalidate =
coll.watch([], {startAfter: next._id, collation: {locale: "simple"}});
return false;
}
if (next.operationType == "drop") {
return false;
}
// THIS is the change we wanted.
firstChangeAfterDrop = next;
return true;
});
assert.eq(firstChangeAfterDrop.documentKey._id, "After drop", tojson(change));
}
}());
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