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/**
* Tests that the server properly respects the maxBSONDepth parameter, and will fail to start up if
* given an invalid depth.
*/
(function() {
"use strict";
const maxBSONDepth = 21;
// Start mongod with a valid BSON depth, then test that it accepts and rejects command
// appropriately based on the depth.
const conn = MongoRunner.runMongod({setParameter: {maxBSONDepth: maxBSONDepth}});
const testDB = conn.getDB("test");
assert.commandWorked(testDB.runCommand({ping: 1}), "Failed to run a command on the server");
assert.commandFailedWithCode(
testDB.runCommand({
find: "coll",
filter: function nestedObj(depth) {
return {x: depth > 1 ? nestedObj(depth - 1) : 1};
}(maxBSONDepth + 1),
}),
ErrorCodes.Overflow,
"Expected server to reject command for exceeding the nesting depth limit");
// Confirm depth limits for $lookup.
assert.commandWorked(testDB.coll1.insert({_id: 1}));
assert.commandWorked(testDB.coll2.insert({_id: 1}));
assert.commandWorked(testDB.runCommand({
aggregate: "coll1",
pipeline: [{$lookup: {from: "coll2", as: "as", pipeline: []}}],
cursor: {}
}));
assert.commandFailedWithCode(
testDB.runCommand(
{
aggregate: "coll1",
pipeline: function nestedPipeline(depth) {
return [{$lookup: {from: "coll2", as: "as", pipeline: depth > 3 ? nestedPipeline(depth - 3) : []}}];
}(maxBSONDepth),
cursor: {}
}),
ErrorCodes.Overflow,
"Expected server to reject command for exceeding the nesting depth limit");
// Restart mongod with a negative maximum BSON depth and test that it fails to start.
MongoRunner.stopMongod(conn);
assert.throws(() => MongoRunner.runMongod({setParameter: "maxBSONDepth=-4"}),
[],
"Expected mongod to fail at startup because depth was negative");
assert.throws(() => MongoRunner.runMongod({setParameter: "maxBSONDepth=20"}),
[],
"Expected mongod to fail at startup because depth was too low");
}());
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