/**
 * TODO (SERVER-69813): Evaluate to get rid of this when ShardServerCatalogCacheLoader will be
 * removed.
 * This test is a simplified version that tries to simulate the condition described in
 * SERVER-42737. It is very hard to replicate the exact condition because of:
 *
 * https://github.com/mongodb/mongo/blob/r4.3.0/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L293
 *
 * This means that secondary should be replicating a newer refresh after that line
 * above and hit the condition described in the ticket to hit the bug.
 */
import {ShardingTest} from "jstests/libs/shardingtest.js";

let rsOptions = {nodes: 2};
let st = new ShardingTest({shards: {rs0: rsOptions, rs1: rsOptions}});

assert.commandWorked(st.s.adminCommand({enableSharding: "test", primaryShard: st.shard0.shardName}));
assert.commandWorked(st.s.adminCommand({shardCollection: "test.user", key: {x: 1}}));
assert.commandWorked(st.s.adminCommand({split: "test.user", middle: {x: 0}}));

let coll = st.s.getDB("test").user;

assert.commandWorked(coll.insert({x: -1}));
assert.commandWorked(coll.insert({x: 1}));

assert.commandWorked(st.s.adminCommand({moveChunk: "test.user", find: {x: 0}, to: st.shard1.shardName}));

// Manually set refreshing flag to true so secondary cache refresh will block.

st.rs0
    .getPrimary()
    .getDB("config")
    .cache.collections.update({_id: "test.user", fake: {"$exists": false}}, {$set: {refreshing: true}});

// Add a delay (sleep) to make sure that secondary will have the {refreshing: true}
// in the lastApplied snapshot and is blocked waiting for refreshing to become false
// before sending update to primary.

let joinUpdate = startParallelShell(
    "sleep(1000);" +
        'db.getSiblingDB("config").cache.collections.update(' +
        '{_id: "test.user", fake: {"$exists": false}},' +
        "{$set: {refreshing: false, lastRefreshedCollectionVersion: Timestamp(5, 0)}});",
    st.rs0.getPrimary().port,
);

// This secondary read should not cause a hang.
st.s.setReadPref("secondary");
st.rs0.awaitReplication();
let res = assert.commandWorked(
    coll
        .getDB("test")
        .runReadCommand({find: "user", filter: {dummy: {"$exists": false}}, readConcern: {level: "local"}}),
);

assert.eq(2, res.cursor.firstBatch.length, tojson(res));

joinUpdate();

st.stop();