// Runner for checkDBHashes() that runs the dbhash command on all replica set nodes
// to ensure all nodes have the same data.
'use strict';

(function() {
load('jstests/libs/discover_topology.js');  // For Topology and DiscoverTopology.
load('jstests/libs/parallelTester.js');     // For Thread.

function checkReplicatedDataHashesThread(hosts) {
    load('jstests/libs/override_methods/implicitly_retry_on_background_op_in_progress.js');

    try {
        const excludedDBs = jsTest.options().excludedDBsFromDBHash;
        const rst = new ReplSetTest(hosts[0]);
        rst.checkReplicatedDataHashes(undefined, excludedDBs);
        return {ok: 1};
    } catch (e) {
        return {ok: 0, hosts: hosts, error: e.toString(), stack: e.stack};
    }
}

const startTime = Date.now();
assert.neq(typeof db, 'undefined', 'No `db` object, is the shell connected to a mongod?');

let skipped = false;
try {
    const conn = db.getMongo();
    const topology = DiscoverTopology.findConnectedNodes(conn);

    if (topology.type === Topology.kStandalone) {
        print('Skipping data consistency checks for cluster because we are connected to a' +
              ' stand-alone mongod: ' + tojsononeline(topology));
        skipped = true;
        return;
    }

    if (topology.type === Topology.kReplicaSet) {
        if (topology.nodes.length === 1) {
            print('Skipping data consistency checks for cluster because we are connected to a' +
                  ' 1-node replica set: ' + tojsononeline(topology));
            skipped = true;
            return;
        }

        const excludedDBs = jsTest.options().excludedDBsFromDBHash;
        new ReplSetTest(topology.nodes[0]).checkReplicatedDataHashes(undefined, excludedDBs);
        return;
    }

    if (topology.type !== Topology.kShardedCluster) {
        throw new Error('Unrecognized topology format: ' + tojson(topology));
    }

    const threads = [];
    try {
        if (topology.configsvr.nodes.length > 1) {
            const thread = new Thread(checkReplicatedDataHashesThread, topology.configsvr.nodes);
            threads.push(thread);
            thread.start();
        } else {
            print('Skipping data consistency checks for 1-node CSRS: ' + tojsononeline(topology));
        }

        for (let shardName of Object.keys(topology.shards)) {
            const shard = topology.shards[shardName];

            if (shard.type === Topology.kStandalone) {
                print('Skipping data consistency checks for stand-alone shard: ' +
                      tojsononeline(topology));
                continue;
            }

            if (shard.type !== Topology.kReplicaSet) {
                throw new Error('Unrecognized topology format: ' + tojson(topology));
            }

            if (shard.nodes.length > 1) {
                const thread = new Thread(checkReplicatedDataHashesThread, shard.nodes);
                threads.push(thread);
                thread.start();
            } else {
                print('Skipping data consistency checks for 1-node replica set shard: ' +
                      tojsononeline(topology));
            }
        }
    } finally {
        // Wait for each thread to finish. Throw an error if any thread fails.
        const returnData = threads.map(thread => {
            thread.join();
            return thread.returnData();
        });

        returnData.forEach(res => {
            assert.commandWorked(res, 'data consistency checks failed');
        });
    }
} finally {
    if (!skipped) {
        const totalTime = Date.now() - startTime;
        print('Finished data consistency checks for cluster in ' + totalTime + ' ms.');
    }
}
})();
