check_for_interrupt_hook.js

// Hook to disable the failpoint that creates random interrupts on a particular thread. We disable
// the failpoint for the duration of the serverInfo section of the fuzzer's preamble.
import {defineFuzzerHooks} from "jstests/libs/jstestfuzz/hook_utils.js";

(function() {
let threadName;

const disableCheckForInterruptFailFP = function() {
    // There is no synchronization between fuzzer clients so this hook cannot run with the
    // concurrent fuzzer.
    assert.eq(TestData.numTestClients,
              1,
              'Cannot run the check for interrupt hook when there is more than 1 client');

    const myUriRes = assert.commandWorked(db.runCommand({whatsmyuri: 1}));
    const myUri = myUriRes.you;

    const curOpRes = assert.commandWorked(db.adminCommand({currentOp: 1, client: myUri}));
    threadName = curOpRes.inprog[0].desc;

    assert.commandWorked(db.adminCommand({
        configureFailPoint: 'checkForInterruptFail',
        mode: 'off',
    }));
};

const enableCheckForInterruptFailFP = function() {
    const chance = TestData.checkForInterruptFailpointChance;

    assert.gte(chance, 0, "checkForInterruptFailpointChance must be >= 0");
    assert.lte(chance, 1, "checkForInterruptFailpointChance must be <= 1");

    assert.commandWorked(db.adminCommand({
        configureFailPoint: 'checkForInterruptFail',
        mode: 'alwaysOn',
        data: {threadName, chance},
    }));
};

defineFuzzerHooks({
    beforeServerInfo: disableCheckForInterruptFailFP,
    afterServerInfo: enableCheckForInterruptFailFP,
});
})();