/**
 * This test demonstrates that rollback via refetch always increments the rollback id as soon as it
 * resolves the common point and before proceeding with other operations.
 *
 * This is a regression test that makes sure we avoid the scenario where we truncate our oplog (at
 * which point the rollback is effectively finished), then shut down uncleanly before we get a
 * chance to update the rollbackId.
 *
 * @tags: [requires_journaling]
 */

(function() {
"use strict";
load("jstests/libs/fail_point_util.js");
load("jstests/replsets/libs/rollback_test.js");
load("jstests/replsets/rslib.js");

const name = jsTestName();
TestData.allowUncleanShutdowns = true;

jsTest.log("Set up a RollbackTest with enableMajorityReadConcern=false");
const rst = new ReplSetTest({
    name,
    nodes: [{}, {}, {rsConfig: {priority: 0}}],
    useBridge: true,
    nodeOptions: {enableMajorityReadConcern: "false"},
    settings: {chainingAllowed: false}
});

rst.startSet();
rst.initiateWithHighElectionTimeout();

const rollbackTest = new RollbackTest(name, rst);
const rollbackNode = rollbackTest.transitionToRollbackOperations();

const baseRBID = assert.commandWorked(rollbackNode.adminCommand("replSetGetRBID")).rbid;

rollbackTest.transitionToSyncSourceOperationsBeforeRollback();

jsTestLog("Make rollback-via-refetch exit early after truncating the oplog");
assert.commandWorked(rollbackNode.adminCommand(
    {configureFailPoint: "rollbackExitEarlyAfterCollectionDrop", mode: "alwaysOn"}));

rollbackTest.transitionToSyncSourceOperationsDuringRollback();

jsTestLog("Wait until we hit the failpoint");
assert.soonNoExcept(function() {
    assert.commandWorked(rollbackNode.adminCommand({
        waitForFailPoint: "rollbackExitEarlyAfterCollectionDrop",
        timesEntered: 1,
        maxTimeMS: kDefaultWaitForFailPointTimeout
    }));
    return true;
}, "failed to reconnect for waitForFailPoint");

// Check that the RBID has still managed to advance.
// Looking at the RBID directly is our first line of defense.
assert.eq(baseRBID + 1, assert.commandWorked(rollbackNode.adminCommand("replSetGetRBID")).rbid);

assert.commandWorked(rollbackNode.adminCommand(
    {configureFailPoint: "rollbackExitEarlyAfterCollectionDrop", mode: "off"}));

// Verify that the node can rejoin the set as normal.
rollbackTest.transitionToSteadyStateOperations();
rollbackTest.stop();
}());