jstests/core/txns/prepare_prepared_transaction.js


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/**
 * Tests that we can successfully prepare a prepared transaction.
 *
 * @tags: [uses_transactions, uses_prepare_transaction]
 */
(function() {
    "use strict";
    load("jstests/core/txns/libs/prepare_helpers.js");

    const dbName = "test";
    const collName = "prepare_prepared_transaction";
    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 = testDB.getMongo().startSession({causalConsistency: false});
    const sessionDB = session.getDatabase(dbName);
    const sessionColl = sessionDB.getCollection(collName);

    const doc1 = {_id: 1, x: 1};

    // Attempting to prepare an already prepared transaction should return successfully with a
    // prepareTimestamp.

    // Client's opTime is later than the prepareOpTime, so just return the prepareTimestamp.
    session.startTransaction();
    assert.commandWorked(sessionColl.insert(doc1));
    const firstTimestamp = PrepareHelpers.prepareTransaction(session);
    const secondTimestamp = PrepareHelpers.prepareTransaction(session);
    // Both prepareTimestamps should be equal.
    assert.eq(firstTimestamp, secondTimestamp);
    session.abortTransaction_forTesting();

    session.endSession();
}());