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/**
* @tags: [
* requires_sharding,
* uses_change_streams,
* ]
*/
(function() {
"use strict";
const dbName = jsTestName();
const setupShardedCluster = (shards = 1) => {
const st = new ShardingTest(
{shards, mongos: 1, config: 1, rs: {nodes: 1, setParameter: {writePeriodicNoops: false}}});
const sdb = st.s0.getDB(dbName);
assert.commandWorked(sdb.dropDatabase());
sdb.setProfilingLevel(0, -1);
st.shard0.getDB(dbName).setProfilingLevel(0, -1);
// Shard the relevant collections.
assert.commandWorked(st.s.adminCommand({enableSharding: dbName}));
st.ensurePrimaryShard(dbName, st.shard0.name);
if (shards === 2) {
// Shard the collection on {_id: 1}, split at {_id: 0} and move the empty upper chunk to
// shard1.
st.shardColl("coll", {_id: 1}, {_id: 0}, {_id: 0}, dbName);
st.shardColl("coll2", {_id: 1}, {_id: 0}, {_id: 0}, dbName);
} else {
assert(shards === 1, "only 1 or 2 shards supported");
assert.commandWorked(st.s.adminCommand({shardCollection: dbName + ".coll", key: {_id: 1}}));
assert.commandWorked(
st.s.adminCommand({shardCollection: dbName + ".coll2", key: {_id: 1}}));
}
const shardId = st.shard0.shardName;
return [sdb, st, shardId];
};
const pscWatch = (db, coll, shardId, options = {}, csOptions = {}) => {
let cmd = {
aggregate: coll,
cursor: {},
pipeline: [{$changeStream: csOptions}],
$_passthroughToShard: {shard: shardId}
};
cmd = Object.assign({}, cmd, options);
if (options.pipeline) {
cmd.pipeline = [{$changeStream: csOptions}].concat(options.pipeline);
}
const resp = db.runCommand(cmd);
assert.commandWorked(resp);
if (options.explain) {
return resp;
}
return new DBCommandCursor(db, resp);
};
// Parsing
let [sdb, st, shardId] = setupShardedCluster();
// Should not allow pipeline without $changeStream.
assert.commandFailedWithCode(sdb.runCommand({
aggregate: "coll",
cursor: {},
pipeline: [{$match: {perfect: true}}],
$_passthroughToShard: {shard: shardId}
}),
6273801);
// $out can't passthrough so it's not allowed.
assert.commandFailedWithCode(
assert.throws(() => pscWatch(sdb, "coll", shardId, {pipeline: [{$out: "h"}]})), 6273802);
// Shard option should be specified.
assert.commandFailedWithCode(
sdb.runCommand(
{aggregate: "coll", cursor: {}, pipeline: [{$changeStream: {}}], $_passthroughToShard: {}}),
40414);
// The shardId field should be a string.
assert.commandFailedWithCode(assert.throws(() => pscWatch(sdb, "coll", 42)),
ErrorCodes.TypeMismatch);
// Can't open a per shard cursor on the config RS.
assert.commandFailedWithCode(assert.throws(() => pscWatch(sdb, "coll", "config")), 6273803);
// The shardId should be a valid shard.
assert.commandFailedWithCode(
assert.throws(() => pscWatch(sdb, "coll", "Dwane 'the Shard' Johnson")),
ErrorCodes.ShardNotFound);
// Correctness.
// Simple collection level watch
// this insert shouldn't show up since it happens before we make a cursor.
sdb.coll.insertOne({location: 1});
let c = pscWatch(sdb, "coll", shardId);
// these inserts should show up since they're after we make a cursor.
for (let i = 1; i <= 4; i++) {
sdb.coll.insertOne({location: 2, i});
assert(!c.isExhausted());
assert.soon(() => c.hasNext());
c.next();
}
assert(!c.hasNext());
// Simple database level watch
c = pscWatch(sdb, 1, shardId);
sdb.coll.insertOne({location: 3});
assert(!c.isExhausted());
assert.soon(() => c.hasNext());
c.next();
sdb.coll2.insertOne({location: 4});
assert(!c.isExhausted());
assert.soon(() => c.hasNext());
c.next();
assert(!c.hasNext());
// Watching collection that doesn't exist yet.
c = pscWatch(sdb, "toBeCreated", shardId);
assert(!c.isExhausted());
assert(!c.hasNext());
st.s.adminCommand({shardCollection: dbName + ".toBeCreated", key: {_id: 1}});
assert(!c.isExhausted());
assert(!c.hasNext());
sdb.toBeCreated.insertOne({location: 8});
assert(!c.isExhausted());
assert.soon(() => c.hasNext());
c.next();
assert(!c.hasNext());
// Explain output should not have a split pipeline. It should look like mongod explain output.
let explainOut = pscWatch(sdb, "coll", shardId, {explain: true});
assert(!explainOut.hasOwnProperty("splitPipeline"));
assert.hasOwnProperty(explainOut, "stages");
// If we getMore an invalidated cursor the cursor should have been closed on mongos and we should
// get CursorNotFound, even if the invalidate event was never recieved by mongos.
[[], [{$match: {f: "filter out invalidate event"}}]].forEach((pipeline) => {
assert.commandWorked(st.s.adminCommand({shardCollection: dbName + ".toDrop", key: {_id: 1}}));
let c = pscWatch(sdb, "toDrop", shardId, {pipeline});
sdb.toDrop.insertOne({});
sdb.toDrop.drop();
assert.commandFailedWithCode(
assert.throws(() => {
assert.retry(() => {
c._runGetMoreCommand();
return false;
}, "change stream should have been invalidated by now", 4);
}),
ErrorCodes.CursorNotFound);
});
st.stop();
// Isolated from events on other shards.
[sdb, st, shardId] = setupShardedCluster(2);
c = pscWatch(sdb, "coll", shardId);
sdb.coll.insertOne({location: 5, _id: -2});
assert(!c.isExhausted());
assert.soon(() => c.hasNext());
c.next();
sdb.coll.insertOne({location: 6, _id: 2});
assert(!c.isExhausted());
assert(!c.hasNext());
// Isolated from events on other shards with whole db.
c = pscWatch(sdb.getSiblingDB("admin"), 1, shardId, {}, {allChangesForCluster: true});
sdb.coll.insertOne({location: 7, _id: -3});
assert(!c.isExhausted());
assert.soon(() => c.hasNext());
c.next();
sdb.coll2.insertOne({location: 8, _id: -4});
assert(!c.isExhausted());
assert.soon(() => c.hasNext());
c.next();
sdb.coll.insertOne({location: 9, _id: 3});
assert(!c.isExhausted());
assert(!c.hasNext());
sdb.coll2.insertOne({location: 10, _id: 4});
assert(!c.isExhausted());
assert(!c.hasNext());
st.stop();
})();
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