/**
 * When the oplog size grows during recovery to exceed the configured maximum, the node must
 * truncate the oplog only up to the oldest active transaction timestamp at the time of the last
 * stable checkpoint. The first oplog entry that belongs to an active transaction is preserved, and
 * all entries after it.
 *
 * This tests the oldestActiveTransactionTimestamp, which is calculated from the "startOpTime"
 * field of documents in the config.transactions collection.
 *
 * @tags: [requires_persistence, uses_transactions, uses_prepare_transaction]
 */

(function() {
"use strict";
load("jstests/core/txns/libs/prepare_helpers.js");
load("jstests/libs/storage_helpers.js");  // getOldestRequiredTimestampForCrashRecovery()

// A new replica set for both the commit and abort tests to ensure the same clean state.
function doTest(commitOrAbort) {
    const replSet = new ReplSetTest({
        // Oplog can be truncated each "sync" cycle. Increase its frequency to once per second.
        nodeOptions: {syncdelay: 1, setParameter: {logComponentVerbosity: tojson({storage: 1})}},
        nodes: [{}, {rsConfig: {priority: 0, votes: 0}}]
    });

    replSet.startSet(PrepareHelpers.replSetStartSetOptions);
    replSet.initiate();
    const primary = replSet.getPrimary();
    const primaryOplog = primary.getDB("local").oplog.rs;
    assert.lte(primaryOplog.dataSize(), PrepareHelpers.oplogSizeBytes);

    const coll = primary.getDB("test").test;
    assert.commandWorked(coll.insert({}, {writeConcern: {w: "majority"}}));

    jsTestLog("Prepare a transaction");

    const session = primary.startSession();
    session.startTransaction();
    assert.commandWorked(session.getDatabase("test").test.insert({myTransaction: 1}));
    const prepareTimestamp = PrepareHelpers.prepareTransaction(session);

    const oldestRequiredTimestampForCrashRecovery =
        getOldestRequiredTimestampForCrashRecovery(primary.getDB("test"));
    assert.lte(oldestRequiredTimestampForCrashRecovery, prepareTimestamp);

    jsTestLog("Insert documents until oplog exceeds oplogSize");

    // Oplog with prepared txn grows indefinitely - let it reach twice its supposed max size.
    PrepareHelpers.growOplogPastMaxSize(replSet);

    // Oplog grew past maxSize, and it includes the oldest active transaction's entry.
    var secondary = replSet.getSecondary();
    function checkSecondaryOplog() {
        const secondaryOplog = secondary.getDB("local").oplog.rs;
        assert.soon(() => {
            return secondaryOplog.dataSize() >= PrepareHelpers.oplogSizeBytes;
        }, "waiting for secondary oplog to grow", ReplSetTest.kDefaultTimeoutMS);
        const secondaryOplogEntry = PrepareHelpers.findPrepareEntry(secondaryOplog);
        assert.eq(secondaryOplogEntry.ts, prepareTimestamp, tojson(secondaryOplogEntry));
    }
    checkSecondaryOplog();

    jsTestLog("Restart the secondary");

    const secondaryId = replSet.getSecondary().nodeId;
    // Validation can't complete while the active transaction holds a lock.
    replSet.stop(secondaryId, undefined, {skipValidation: true});
    secondary = replSet.start(secondaryId, {}, true /* restart */);

    jsTestLog("Restarted");

    replSet.awaitSecondaryNodes();
    checkSecondaryOplog();

    if (commitOrAbort === "commit") {
        jsTestLog("Commit prepared transaction and wait for oplog to shrink to max oplogSize");
        PrepareHelpers.commitTransaction(session, prepareTimestamp);
    } else if (commitOrAbort === "abort") {
        jsTestLog("Abort prepared transaction and wait for oplog to shrink to max oplogSize");
        assert.commandWorked(session.abortTransaction_forTesting());
    } else {
        throw new Error(`Unrecognized value for commitOrAbort: ${commitOrAbort}`);
    }

    PrepareHelpers.awaitOplogTruncation(replSet);

    // ReplSetTest reacts poorly to restarting a node, end it manually.
    replSet.stopSet(true, false, {});
}
doTest("commit");
doTest("abort");
})();