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/**
* Test that doing an insert on a collection with a unique index causes a prepare conflict if that
* collection has operations from a prepared transaction on it. To make sure that the new document
* doesn't violate the unique index, the node will have to perform reads on documents in the
* collection. Since there are prepared operations on documents in the collection, the read should
* cause a prepare conflict.
*
* @tags: [uses_transactions, uses_prepare_transaction]
*/
(function() {
"use strict";
load("jstests/core/txns/libs/prepare_helpers.js");
const dbName = "test";
const collName = "prepare_transaction_unique_index_conflict";
const testDB = db.getSiblingDB(dbName);
const testColl = testDB.getCollection(collName);
testColl.drop({writeConcern: {w: "majority"}});
assert.commandWorked(testDB.runCommand({create: collName, writeConcern: {w: "majority"}}));
const session = db.getMongo().startSession();
const sessionDB = session.getDatabase(dbName);
const sessionColl = sessionDB.getCollection(collName);
assert.commandWorked(testColl.insert({_id: 1, a: 0}));
// Ensure that the "a" field is unique.
assert.commandWorked(testColl.createIndex({"a": 1}, {unique: true}));
session.startTransaction();
assert.commandWorked(sessionColl.insert({_id: 2, a: 1}));
assert.commandWorked(sessionColl.update({_id: 2}, {$unset: {a: 1}}));
const prepareTimestamp = PrepareHelpers.prepareTransaction(session);
// While trying to insert this document, the node will have to perform reads to check if it
// violates the unique index, which should cause a prepare conflict.
assert.commandFailedWithCode(
testDB.runCommand({insert: collName, documents: [{_id: 3, a: 1}], maxTimeMS: 5000}),
ErrorCodes.MaxTimeMSExpired);
assert.commandWorked(session.abortTransaction_forTesting());
})();
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