mongodb/jstests/noPassthrough/loglong.js

// test for SERVER-5013
// make sure very long long lines get truncated

(function() {
    "use strict";

    const options = {setParameter: "maxLogSizeKB=9"};
    const conn = MongoRunner.runMongod(options);

    var db = conn.getDB('db');
    var res = db.adminCommand({getParameter: 1, maxLogSizeKB: 1});
    assert.eq(9, res.maxLogSizeKB);

    var t = db.loglong;
    t.drop();

    t.insert({x: 1});

    var n = 0;
    var query = {x: []};
    while (Object.bsonsize(query) < 30000) {
        query.x.push(n++);
    }

    assertLogTruncated(db, t, 9);

    var res = db.adminCommand({setParameter: 1, maxLogSizeKB: 8});
    assert.eq(res.ok, 1);

    assertLogTruncated(db, t, 8);

    function assertLogTruncated(db, t, maxLogSize) {
        var before = db.adminCommand({setParameter: 1, logLevel: 1});

        t.findOne(query);

        var x = db.adminCommand({setParameter: 1, logLevel: before.was});
        assert.eq(1, x.was, tojson(x));

        var log = db.adminCommand({getLog: "global"}).log;

        var found = false;
        var toFind = "warning: log line attempted (16kB) over max size (" + maxLogSize + "kB)";
        for (var i = log.length - 1; i >= 0; i--) {
            if (log[i].indexOf(toFind) >= 0) {
                found = true;
                break;
            }
        }

        assert(found, tojson(log));
    }
    MongoRunner.stopMongod(conn);
})();