// Test TransientTransactionErrors error label in mongos write commands.
//
// @tags: [
//   uses_multi_shard_transaction,
//   uses_transactions,
// ]
(function() {
"use strict";

load("jstests/sharding/libs/failpoint_helpers.js");
load("jstests/sharding/libs/sharded_transactions_helpers.js");

const dbName = "test";
const collName = "foo";
const ns = dbName + "." + collName;

let numCalls = 0;
const startTransaction = function(mongosSession, dbName, collName) {
    numCalls++;
    mongosSession.startTransaction();
    return mongosSession.getDatabase(dbName).runCommand({
        insert: collName,
        // Target both chunks, wherever they may be
        documents: [{_id: -1 * numCalls}, {_id: numCalls}],
        readConcern: {level: "snapshot"},
    });
};

const abortTransactionDirectlyOnParticipant = function(rst, lsid, txnNumber) {
    assert.commandWorked(rst.getPrimary().adminCommand({
        abortTransaction: 1,
        lsid: lsid,
        txnNumber: NumberLong(txnNumber),
        autocommit: false,
    }));
};

const checkMongosResponse = function(
    res, expectedErrorCode, expectedErrorLabel, writeConcernErrorExpected) {
    if (expectedErrorCode) {
        assert.eq(0, res.ok, tojson(res));
        assert.eq(expectedErrorCode, res.code, tojson(res));
    } else {
        assert.eq(1, res.ok, tojson(res));
    }

    if (expectedErrorLabel) {
        assert.neq(null, res.errorLabels, tojson(res));
        assert.contains(expectedErrorLabel, res.errorLabels, tojson(res));
    } else {
        assert.eq(null, res.errorLabels, tojson(res));
    }

    if (writeConcernErrorExpected) {
        assert.neq(null, res.writeConcernError, tojson(res));
    } else {
        assert.eq(null, res.writeConcernError, tojson(res));
    }
};

const runCommitTests = function(commandSentToShard) {
    jsTest.log("Mongos does not attach any error label if " + commandSentToShard +
               " returns success.");
    assert.commandWorked(startTransaction(mongosSession, dbName, collName));
    res = mongosSession.commitTransaction_forTesting();
    checkMongosResponse(res, null, null, null);

    jsTest.log("Mongos does not attach any error label if " + commandSentToShard +
               " returns success with writeConcern error.");
    failCommandWithWriteConcernError(st.rs0, commandSentToShard);
    assert.commandWorked(startTransaction(mongosSession, dbName, collName));
    res = mongosSession.commitTransaction_forTesting();
    checkMongosResponse(res, null, null, true);
    turnOffFailCommand(st.rs0);

    jsTest.log("Mongos attaches 'TransientTransactionError' label if " + commandSentToShard +
               " returns NoSuchTransaction.");
    assert.commandWorked(startTransaction(mongosSession, dbName, collName));
    abortTransactionDirectlyOnParticipant(
        st.rs0, mongosSession.getSessionId(), mongosSession.getTxnNumber_forTesting());
    res = mongosSession.commitTransaction_forTesting();
    checkMongosResponse(res, ErrorCodes.NoSuchTransaction, "TransientTransactionError", null);
    turnOffFailCommand(st.rs0);

    jsTest.log("failCommand with errorLabels but without errorCode or writeConcernError should " +
               "not interfere with mongos' error labels attaching");
    assert.commandWorked(st.s.adminCommand({
        configureFailPoint: "failCommand",
        mode: "alwaysOn",
        data: {failCommands: ["insert"], errorLabels: ["foo"]}
    }));
    assert.commandWorked(startTransaction(mongosSession, dbName, collName));
    abortTransactionDirectlyOnParticipant(
        st.rs0, mongosSession.getSessionId(), mongosSession.getTxnNumber_forTesting());
    res = mongosSession.commitTransaction_forTesting();
    checkMongosResponse(res, ErrorCodes.NoSuchTransaction, "TransientTransactionError", null);
    assert.commandWorked(st.s.adminCommand({configureFailPoint: "failCommand", mode: "off"}));

    jsTest.log("Mongos does not attach any error label if " + commandSentToShard +
               " returns NoSuchTransaction with writeConcern error.");
    failCommandWithWriteConcernError(st.rs0, commandSentToShard);
    assert.commandWorked(startTransaction(mongosSession, dbName, collName));
    abortTransactionDirectlyOnParticipant(
        st.rs0, mongosSession.getSessionId(), mongosSession.getTxnNumber_forTesting());
    res = mongosSession.commitTransaction_forTesting();
    checkMongosResponse(res, ErrorCodes.NoSuchTransaction, null, true);
    turnOffFailCommand(st.rs0);

    jsTest.log("No error label for network error if " + commandSentToShard +
               " returns network error");
    assert.commandWorked(startTransaction(mongosSession, dbName, collName));
    failCommandWithError(st.rs0, {
        commandToFail: commandSentToShard,
        errorCode: ErrorCodes.InternalError,
        closeConnection: true
    });
    res = mongosSession.commitTransaction_forTesting();
    checkMongosResponse(res, ErrorCodes.HostUnreachable, false /* expectedErrorLabel */, null);
    turnOffFailCommand(st.rs0);
};

let st = new ShardingTest({shards: 2, mongosOptions: {verbose: 3}});

// Create a sharded collection with a chunk on each shard:
// shard0: [-inf, 0)
// shard1: [0, +inf)
assert.commandWorked(st.s.adminCommand({enableSharding: dbName}));
assert.commandWorked(st.s.adminCommand({movePrimary: dbName, to: st.shard0.shardName}));
assert.commandWorked(st.s.adminCommand({shardCollection: ns, key: {_id: 1}}));
assert.commandWorked(st.s.adminCommand({split: ns, middle: {_id: 0}}));
st.refreshCatalogCacheForNs(st.s, ns);

// These forced refreshes are not strictly necessary; they just prevent extra TXN log lines
// from the shards starting, aborting, and restarting the transaction due to needing to
// refresh after the transaction has started.
assert.commandWorked(st.shard0.adminCommand({_flushRoutingTableCacheUpdates: ns}));
assert.commandWorked(st.shard1.adminCommand({_flushRoutingTableCacheUpdates: ns}));

let mongosSession = st.s.startSession();

let res;

// write statement
jsTest.log(
    "'TransientTransactionError' label is attached if write statement returns WriteConflict");
failCommandWithError(
    st.rs0, {commandToFail: "insert", errorCode: ErrorCodes.WriteConflict, closeConnection: false});
res = startTransaction(mongosSession, dbName, collName);
checkMongosResponse(res, ErrorCodes.WriteConflict, "TransientTransactionError", null);
turnOffFailCommand(st.rs0);
assert.commandFailedWithCode(mongosSession.abortTransaction_forTesting(),
                             ErrorCodes.NoSuchTransaction);

jsTest.log("'TransientTransactionError' label is attached if write statement returns " +
           "WriteConflict via failCommand on mongos");
assert.commandWorked(st.s.adminCommand({
    configureFailPoint: "failCommand",
    mode: "alwaysOn",
    data: {failCommands: ["insert"], errorCode: ErrorCodes.WriteConflict}
}));
res = startTransaction(mongosSession, dbName, collName);
checkMongosResponse(res, ErrorCodes.WriteConflict, "TransientTransactionError", null);
assert.commandWorked(st.s.adminCommand({configureFailPoint: "failCommand", mode: "off"}));
assert.commandFailedWithCode(mongosSession.abortTransaction_forTesting(),
                             ErrorCodes.NoSuchTransaction);

jsTest.log("failCommand with errorLabels should override labels attached by mongos");
assert.commandWorked(st.s.adminCommand({
    configureFailPoint: "failCommand",
    mode: "alwaysOn",
    data: {failCommands: ["insert"], errorCode: ErrorCodes.WriteConflict, errorLabels: ["foo"]}
}));
res = startTransaction(mongosSession, dbName, collName);
checkMongosResponse(res, ErrorCodes.WriteConflict, "foo", null);
assert.commandWorked(st.s.adminCommand({configureFailPoint: "failCommand", mode: "off"}));
assert.commandFailedWithCode(mongosSession.abortTransaction_forTesting(),
                             ErrorCodes.NoSuchTransaction);

jsTest.log("failCommand with empty errorLabels should suppress labels attached by mongos");
assert.commandWorked(st.s.adminCommand({
    configureFailPoint: "failCommand",
    mode: "alwaysOn",
    data: {failCommands: ["insert"], errorCode: ErrorCodes.WriteConflict, errorLabels: []}
}));
res = startTransaction(mongosSession, dbName, collName);
checkMongosResponse(res, ErrorCodes.WriteConflict, null, null);
assert.commandWorked(st.s.adminCommand({configureFailPoint: "failCommand", mode: "off"}));
assert.commandFailedWithCode(mongosSession.abortTransaction_forTesting(),
                             ErrorCodes.NoSuchTransaction);

// statements prior to commit network error
failCommandWithError(
    st.rs0, {commandToFail: "insert", errorCode: ErrorCodes.InternalError, closeConnection: true});
res = startTransaction(mongosSession, dbName, collName);
checkMongosResponse(res, ErrorCodes.HostUnreachable, "TransientTransactionError", null);
turnOffFailCommand(st.rs0);
assert.commandFailedWithCode(mongosSession.abortTransaction_forTesting(),
                             ErrorCodes.NoSuchTransaction);

// commitTransaction for single-shard transaction (mongos sends commitTransaction)
runCommitTests("commitTransaction");

// commitTransaction for multi-shard transaction (mongos sends coordinateCommitTransaction)
assert.commandWorked(st.s.adminCommand({moveChunk: ns, find: {_id: 0}, to: st.shard1.shardName}));
flushRoutersAndRefreshShardMetadata(st, {ns});
runCommitTests("coordinateCommitTransaction");

st.stop();
}());