commands_preserve_exec_error_code.js

// Tests that an error encountered during PlanExecutor execution will be propagated back to the user
// with the original error code. This is important for retryable errors like
// 'InterruptedDueToReplStateChange',
// and also to ensure that the error is not swallowed and the diagnostic info is not lost.
const kPlanExecAlwaysFailsCode = 4382101;

const mongod = MongoRunner.runMongod({});
assert.neq(mongod, null, "mongod failed to start up");
const db = mongod.getDB("test");
const coll = db.commands_preserve_exec_error_code;
coll.drop();

assert.commandWorked(coll.insert([{_id: 0}, {_id: 1}, {_id: 2}]));
assert.commandWorked(coll.createIndex({geo: "2d"}));

assert.commandWorked(
    db.adminCommand({configureFailPoint: "planExecutorAlwaysFails", mode: "alwaysOn"}));

function assertFailsWithExpectedError(fn) {
    const error = assert.throws(fn);
    assert.eq(error.code, kPlanExecAlwaysFailsCode, tojson(error));
    assert.neq(-1,
               error.message.indexOf("planExecutorAlwaysFails"),
               "Expected error message to be preserved");
}
function assertCmdFailsWithExpectedError(cmd) {
    const res =
        assert.commandFailedWithCode(db.runCommand(cmd), kPlanExecAlwaysFailsCode, tojson(cmd));
    assert.neq(-1,
               res.errmsg.indexOf("planExecutorAlwaysFails"),
               "Expected error message to be preserved");
}

assertFailsWithExpectedError(() => coll.find().itcount());
assertFailsWithExpectedError(() => coll.updateOne({_id: 1}, {$set: {x: 2}}));
assertFailsWithExpectedError(() => coll.deleteOne({_id: 1}));
assertFailsWithExpectedError(() => coll.count({_id: 1}));
assertFailsWithExpectedError(() => coll.aggregate([]).itcount());
assertFailsWithExpectedError(
    () => coll.aggregate([{$geoNear: {near: [0, 0], distanceField: "d"}}]).itcount());
assertCmdFailsWithExpectedError({distinct: coll.getName(), key: "_id"});
assertCmdFailsWithExpectedError(
    {findAndModify: coll.getName(), query: {_id: 1}, update: {$set: {x: 2}}});

const cmdRes = db.runCommand({find: coll.getName(), batchSize: 0});
assert.commandWorked(cmdRes);
assertCmdFailsWithExpectedError(
    {getMore: cmdRes.cursor.id, collection: coll.getName(), batchSize: 1});

assert.commandWorked(db.adminCommand({configureFailPoint: "planExecutorAlwaysFails", mode: "off"}));
MongoRunner.stopMongod(mongod);