/**
 * Confirms inclusion of query, command object and planSummary in currentOp() for CRUD operations.
 * This test should not be run in the parallel suite as it sets fail points.
 * @tags: [requires_replication, requires_sharding]
 */
(function() {
"use strict";

// This test runs manual getMores using different connections, which will not inherit the
// implicit session of the cursor establishing command.
TestData.disableImplicitSessions = true;

load("jstests/libs/fixture_helpers.js");  // For FixtureHelpers.

// Set up a 2-shard cluster. Configure 'internalQueryExecYieldIterations' on both shards such
// that operations will yield on each PlanExecuter iteration.
const st = new ShardingTest({
    name: jsTestName(),
    shards: 2,
    rs: {nodes: 1, setParameter: {internalQueryExecYieldIterations: 1}}
});

// Obtain one mongoS connection and a second direct to the shard.
const rsConn = st.rs0.getPrimary();
const mongosConn = st.s;

const mongosDB = mongosConn.getDB("currentop_query");
const mongosColl = mongosDB.currentop_query;

// Enable sharding on the the test database and ensure that the primary is on shard0.
assert.commandWorked(mongosDB.adminCommand({enableSharding: mongosDB.getName()}));
st.ensurePrimaryShard(mongosDB.getName(), rsConn.name);

// On a sharded cluster, aggregations which are dispatched to multiple shards first establish
// zero-batch cursors and only hit the failpoints on the following getMore. This helper takes a
// generic command object and creates an appropriate filter given the use-case.
function commandOrOriginatingCommand(cmdObj, isRemoteShardCurOp) {
    const cmdFieldName = (isRemoteShardCurOp ? "cursor.originatingCommand" : "command");
    const cmdFilter = {};
    for (let subFieldName in cmdObj) {
        cmdFilter[`${cmdFieldName}.${subFieldName}`] = cmdObj[subFieldName];
    }
    return cmdFilter;
}

// Drops and re-creates the sharded test collection.
function dropAndRecreateTestCollection() {
    assert(mongosColl.drop());
    assert.commandWorked(
        mongosDB.adminCommand({shardCollection: mongosColl.getFullName(), key: {_id: "hashed"}}));
}

/**
 * @param {connection} conn - The connection through which to run the test suite.
 * @param {string} readMode - The read mode to use for the parallel shell. This allows
 * testing currentOp() output for both OP_QUERY and OP_GET_MORE queries, as well as "find" and
 * "getMore" commands.
 * @params {function} currentOp - Function which takes a database object and a filter, and
 * returns an array of matching current operations. This allows us to test output for both the
 * currentOp command and the $currentOp aggregation stage.
 * @params {boolean} truncatedOps - if true, we expect operations that exceed the maximum
 * currentOp size to be truncated in the output 'command' field, and we run only a subset of
 * tests designed to exercise that scenario. If false, we expect the entire operation to be
 * returned.
 * @params {boolean} localOps - if true, we expect currentOp to return operations running on a
 * mongoS itself rather than on the shards.
 */
function runTests({conn, readMode, currentOp, truncatedOps, localOps}) {
    const testDB = conn.getDB("currentop_query");
    const coll = testDB.currentop_query;
    dropAndRecreateTestCollection();

    for (let i = 0; i < 5; ++i) {
        assert.commandWorked(coll.insert({_id: i, a: i}));
    }

    const isLocalMongosCurOp = (FixtureHelpers.isMongos(testDB) && localOps);
    const isRemoteShardCurOp = (FixtureHelpers.isMongos(testDB) && !localOps);

    // If 'truncatedOps' is true, run only the subset of tests designed to validate the
    // truncation behaviour. Otherwise, run the standard set of tests which assume that
    // truncation will not occur.
    if (truncatedOps) {
        runTruncationTests();
    } else {
        runStandardTests();
    }

    /**
     * Captures currentOp() for a given test command/operation and confirms that namespace,
     * operation type and planSummary are correct.
     *
     *  @param {Object} testObj - Contains test arguments.
     *  @param {function} testObj.test - A function that runs the desired test op/cmd.
     *  @param {string} testObj.planSummary - A string containing the expected planSummary.
     *  @param {Object} testObj.currentOpFilter - A filter to be used to narrow currentOp()
     *  output to only the relevant operation or command.
     *  @param {string} [testObj.command] - The command to test against. Will look for this to
     *  be a key in the currentOp().query object.
     *  @param {string} [testObj.operation] - The operation to test against. Will look for this
     *  to be the value of the currentOp().op field.
     */
    function confirmCurrentOpContents(testObj) {
        // Force queries to hang on yield to allow for currentOp capture.
        FixtureHelpers.runCommandOnEachPrimary({
            db: conn.getDB("admin"),
            cmdObj: {
                configureFailPoint: "setYieldAllLocksHang",
                mode: "alwaysOn",
                data: {namespace: mongosColl.getFullName()}
            }
        });

        // Set the test configuration in TestData for the parallel shell test.
        TestData.shellReadMode = readMode;
        TestData.currentOpTest = testObj.test;
        TestData.currentOpCollName = "currentop_query";

        // Wrapper function which sets the readMode and DB before running the test function
        // found at TestData.currentOpTest.
        function doTest() {
            const testDB = db.getSiblingDB(TestData.currentOpCollName);
            testDB.getMongo().forceReadMode(TestData.shellReadMode);
            TestData.currentOpTest(testDB);
        }

        // Run the operation in the background.
        var awaitShell = startParallelShell(doTest, testDB.getMongo().port);

        // Augment the currentOpFilter with additional known predicates.
        if (!testObj.currentOpFilter.ns) {
            testObj.currentOpFilter.ns = coll.getFullName();
        }
        if (!isLocalMongosCurOp) {
            testObj.currentOpFilter.planSummary = testObj.planSummary;
        }
        if (testObj.hasOwnProperty("command")) {
            testObj.currentOpFilter["command." + testObj.command] = {$exists: true};
        } else if (testObj.hasOwnProperty("operation")) {
            testObj.currentOpFilter.op = testObj.operation;
        }

        // Capture currentOp record for the query and confirm that the 'query' and 'planSummary'
        // fields contain the content expected. We are indirectly testing the 'ns' field as well
        // with the currentOp query argument.
        assert.soon(
            function() {
                var result = currentOp(testDB, testObj.currentOpFilter, truncatedOps, localOps);
                assert.commandWorked(result);

                if (result.inprog.length > 0) {
                    result.inprog.forEach((op) => {
                        assert.eq(op.appName, "MongoDB Shell", tojson(result));
                        assert.eq(
                            op.clientMetadata.application.name, "MongoDB Shell", tojson(result));
                    });
                    return true;
                }

                return false;
            },
            function() {
                return "Failed to find operation from " + tojson(testObj.currentOpFilter) +
                    " in currentOp() output: " +
                    tojson(currentOp(testDB, {}, truncatedOps, localOps)) +
                    (isLocalMongosCurOp ? ", with localOps=false: " +
                             tojson(currentOp(testDB, {}, truncatedOps, false))
                                        : "");
            });

        // Allow the query to complete.
        FixtureHelpers.runCommandOnEachPrimary({
            db: conn.getDB("admin"),
            cmdObj: {configureFailPoint: "setYieldAllLocksHang", mode: "off"}
        });

        awaitShell();
        delete TestData.currentOpCollName;
        delete TestData.currentOpTest;
        delete TestData.shellReadMode;
    }

    /**
     * Runs a set of tests to verify that the currentOp output appears as expected. These tests
     * assume that the 'truncateOps' parameter is false, so no command objects in the currentOp
     * output will be truncated to string.
     */
    function runStandardTests() {
        //
        // Confirm currentOp content for commands defined in 'testList'.
        //
        var testList = [
            {
                test: function(db) {
                    assert.eq(db.currentop_query
                                  .aggregate([{$match: {a: 1, $comment: "currentop_query"}}], {
                                      collation: {locale: "fr"},
                                      hint: {_id: 1},
                                      comment: "currentop_query_2"
                                  })
                                  .itcount(),
                              1);
                },
                planSummary: "IXSCAN { _id: 1 }",
                currentOpFilter: commandOrOriginatingCommand({
                    "aggregate": {$exists: true},
                    "pipeline.0.$match.$comment": "currentop_query",
                    "comment": "currentop_query_2",
                    "collation.locale": "fr",
                    "hint": {_id: 1}
                },
                                                             isRemoteShardCurOp)
            },
            {
                test: function(db) {
                    assert.eq(db.currentop_query.find({a: 1, $comment: "currentop_query"})
                                  .collation({locale: "fr"})
                                  .count(),
                              1);
                },
                command: "count",
                planSummary: "COLLSCAN",
                currentOpFilter:
                    {"command.query.$comment": "currentop_query", "command.collation.locale": "fr"}
            },
            {
                test: function(db) {
                    assert.eq(
                        db.currentop_query.distinct(
                            "a", {a: 1, $comment: "currentop_query"}, {collation: {locale: "fr"}}),
                        [1]);
                },
                command: "distinct",
                planSummary: "COLLSCAN",
                currentOpFilter:
                    {"command.query.$comment": "currentop_query", "command.collation.locale": "fr"}
            },
            {
                test: function(db) {
                    assert.eq(db.currentop_query.find({a: 1}).comment("currentop_query").itcount(),
                              1);
                },
                command: "find",
                planSummary: "COLLSCAN",
                currentOpFilter: {"command.comment": "currentop_query"}
            },
            {
                test: function(db) {
                    assert.eq(db.currentop_query.findAndModify({
                        query: {_id: 1, a: 1, $comment: "currentop_query"},
                        update: {$inc: {b: 1}},
                        collation: {locale: "fr"}
                    }),
                              {"_id": 1, "a": 1});
                },
                command: "findandmodify",
                planSummary: "IXSCAN { _id: 1 }",
                currentOpFilter:
                    {"command.query.$comment": "currentop_query", "command.collation.locale": "fr"}
            },
            {
                test: function(db) {
                    assert.commandWorked(db.currentop_query.mapReduce(() => {}, (a, b) => {}, {
                        query: {$comment: "currentop_query_mr"},
                        out: {inline: 1},
                    }));
                },
                planSummary: "COLLSCAN",
                // A mapReduce which gets sent to the shards is internally translated to an
                // aggregation.
                currentOpFilter:
                    (isRemoteShardCurOp ? {
                        "cursor.originatingCommand.aggregate": "currentop_query",
                        "cursor.originatingCommand.pipeline.0.$match.$comment": "currentop_query_mr"
                    }
                                        : {
                                              "command.query.$comment": "currentop_query_mr",
                                              "ns": /^currentop_query.*currentop_query/
                                          }),
            },
            {
                test: function(db) {
                    assert.commandWorked(db.currentop_query.remove(
                        {a: 2, $comment: "currentop_query"}, {collation: {locale: "fr"}}));
                },
                operation: "remove",
                planSummary: "COLLSCAN",
                currentOpFilter: (isLocalMongosCurOp
                                      ? {"command.delete": coll.getName(), "command.ordered": true}
                                      : {
                                            "command.q.$comment": "currentop_query",
                                            "command.collation.locale": "fr"
                                        })
            },
            {
                test: function(db) {
                    assert.commandWorked(
                        db.currentop_query.update({a: 1, $comment: "currentop_query"},
                                                  {$inc: {b: 1}},
                                                  {collation: {locale: "fr"}, multi: true}));
                },
                operation: "update",
                planSummary: "COLLSCAN",
                currentOpFilter: (isLocalMongosCurOp
                                      ? {"command.update": coll.getName(), "command.ordered": true}
                                      : {
                                            "command.q.$comment": "currentop_query",
                                            "command.collation.locale": "fr"
                                        })
            }
        ];

        testList.forEach(confirmCurrentOpContents);

        //
        // Confirm currentOp contains collation for find command.
        //
        if (readMode === "commands") {
            confirmCurrentOpContents({
                test: function(db) {
                    assert.eq(db.currentop_query.find({a: 1})
                                  .comment("currentop_query")
                                  .collation({locale: "fr"})
                                  .itcount(),
                              1);
                },
                command: "find",
                planSummary: "COLLSCAN",
                currentOpFilter:
                    {"command.comment": "currentop_query", "command.collation.locale": "fr"}
            });
        }

        //
        // Confirm currentOp content for the $geoNear aggregation stage.
        //
        dropAndRecreateTestCollection();
        for (let i = 0; i < 10; ++i) {
            assert.commandWorked(coll.insert({a: i, loc: {type: "Point", coordinates: [i, i]}}));
        }
        assert.commandWorked(coll.createIndex({loc: "2dsphere"}));
        confirmCurrentOpContents({
            test: function(db) {
                assert.commandWorked(db.runCommand({
                    aggregate: "currentop_query",
                    cursor: {},
                    pipeline: [{
                        $geoNear: {
                            near: {type: "Point", coordinates: [1, 1]},
                            distanceField: "dist",
                            spherical: true,
                            query: {$comment: "currentop_query"},
                        }
                    }],
                    collation: {locale: "fr"},
                    comment: "currentop_query",
                }));
            },
            planSummary: "GEO_NEAR_2DSPHERE { loc: \"2dsphere\" }",
            currentOpFilter: commandOrOriginatingCommand({
                "aggregate": {$exists: true},
                "pipeline.0.$geoNear.query.$comment": "currentop_query",
                "collation.locale": "fr",
                "comment": "currentop_query",
            },
                                                         isRemoteShardCurOp)
        });

        //
        // Confirm currentOp content for getMore. This case tests command and legacy getMore
        // with originating find and aggregate commands.
        //
        dropAndRecreateTestCollection();
        for (let i = 0; i < 10; ++i) {
            assert.commandWorked(coll.insert({a: i}));
        }

        const originatingCommands = {
            find: {find: "currentop_query", filter: {}, comment: "currentop_query", batchSize: 0},
            aggregate: {
                aggregate: "currentop_query",
                pipeline: [{$match: {}}],
                comment: "currentop_query",
                cursor: {batchSize: 0}
            }
        };

        for (let cmdName in originatingCommands) {
            const cmdObj = originatingCommands[cmdName];
            const cmdRes = testDB.runCommand(cmdObj);
            assert.commandWorked(cmdRes);

            TestData.commandResult = cmdRes;

            // If this is a non-localOps test running via mongoS, then the cursorID we obtained
            // above is the ID of the mongoS cursor, and will not match the IDs of any of the
            // individual shard cursors in the currentOp output. We therefore don't perform an
            // exact match on 'command.getMore', but only verify that the cursor ID is non-zero.
            const filter = {
                "command.getMore":
                    (isRemoteShardCurOp ? {$gt: 0} : TestData.commandResult.cursor.id),
                [`cursor.originatingCommand.${cmdName}`]: {$exists: true},
                "cursor.originatingCommand.comment": "currentop_query"
            };

            confirmCurrentOpContents({
                test: function(db) {
                    const cursor = new DBCommandCursor(db, TestData.commandResult, 5);
                    assert.eq(cursor.itcount(), 10);
                },
                command: "getMore",
                planSummary: "COLLSCAN",
                currentOpFilter: filter
            });

            delete TestData.commandResult;
        }

        //
        // Confirm that currentOp displays upconverted getMore and originatingCommand in the
        // case of a legacy query.
        //
        if (readMode === "legacy") {
            let filter = {
                "command.getMore": {$gt: 0},
                "command.collection": "currentop_query",
                "command.batchSize": 2,
                "cursor.originatingCommand.find": "currentop_query",
                "cursor.originatingCommand.ntoreturn": 2,
                "cursor.originatingCommand.comment": "currentop_query"
            };

            confirmCurrentOpContents({
                test: function(db) {
                    load("jstests/libs/fixture_helpers.js");  // For FixtureHelpers.

                    // Temporarily disable hanging yields so that we can iterate the first
                    // batch.
                    FixtureHelpers.runCommandOnEachPrimary({
                        db: db.getSiblingDB("admin"),
                        cmdObj: {configureFailPoint: "setYieldAllLocksHang", mode: "off"}
                    });

                    let cursor =
                        db.currentop_query.find({}).comment("currentop_query").batchSize(2);

                    // Exhaust the current batch so that the next request will force a getMore.
                    while (cursor.objsLeftInBatch() > 0) {
                        cursor.next();
                    }

                    // Set yields to hang so that we can check currentOp output.
                    FixtureHelpers.runCommandOnEachPrimary({
                        db: db.getSiblingDB("admin"),
                        cmdObj: {
                            configureFailPoint: "setYieldAllLocksHang",
                            mode: "alwaysOn",
                            data: {namespace: db.currentop_query.getFullName()}
                        }
                    });

                    assert.eq(cursor.itcount(), 8);
                },
                operation: "getmore",
                planSummary: "COLLSCAN",
                currentOpFilter: filter
            });
        }

        //
        // Confirm that a legacy query whose filter contains a field named 'query' appears as
        // expected in currentOp. This test ensures that upconverting a legacy query correctly
        // identifies this as a user field rather than a wrapped filter spec.
        //
        if (readMode === "legacy") {
            confirmCurrentOpContents({
                test: function(db) {
                    assert.eq(db.currentop_query.find({query: "foo", $comment: "currentop_query"})
                                  .itcount(),
                              0);
                },
                command: "find",
                planSummary: "COLLSCAN",
                currentOpFilter:
                    {"command.filter.$comment": "currentop_query", "command.filter.query": "foo"}
            });
        }
    }

    /**
     * Runs a set of tests to verify that currentOp will serialize objects exceeding ~1000 bytes
     * to string when the 'truncateOps' parameter is set.
     */
    function runTruncationTests() {
        dropAndRecreateTestCollection();
        assert.commandWorked(coll.insert({a: 1}));

        // When the currentOp command serializes the query object as a string, individual string
        // values inside it are truncated at 150 characters. To test "total length" truncation
        // we need to pass multiple values, each smaller than 150 bytes.
        TestData.queryFilter = {
            "1": "1".repeat(149),
            "2": "2".repeat(149),
            "3": "3".repeat(149),
            "4": "4".repeat(149),
            "5": "5".repeat(149),
            "6": "6".repeat(149),
            "7": "7".repeat(149),
        };

        var truncatedQueryString = "^\\{ find: \"currentop_query\", filter: \\{ " +
            "1: \"1{149}\", 2: \"2{149}\", 3: \"3{149}\", 4: \"4{149}\", 5: \"5{149}\", " +
            "6: \"6{149}\", 7: \"7+\\.\\.\\.";

        let currentOpFilter;

        currentOpFilter = {
            "command.$truncated": {$regex: truncatedQueryString},
            "command.comment": "currentop_query"
        };

        confirmCurrentOpContents({
            test: function(db) {
                assert.eq(db.currentop_query.find(TestData.queryFilter)
                              .comment("currentop_query")
                              .itcount(),
                          0);
            },
            planSummary: "COLLSCAN",
            currentOpFilter: currentOpFilter
        });

        // Verify that an originatingCommand truncated by currentOp appears as { $truncated:
        // <string>, comment: <string> }.
        const cmdRes = testDB.runCommand({
            find: "currentop_query",
            filter: TestData.queryFilter,
            comment: "currentop_query",
            batchSize: 0
        });
        assert.commandWorked(cmdRes);

        TestData.commandResult = cmdRes;

        currentOpFilter = {
            "command.getMore": (isRemoteShardCurOp ? {$gt: 0} : TestData.commandResult.cursor.id),
            "cursor.originatingCommand.$truncated": {$regex: truncatedQueryString},
            "cursor.originatingCommand.comment": "currentop_query"
        };

        confirmCurrentOpContents({
            test: function(db) {
                var cursor = new DBCommandCursor(db, TestData.commandResult, 5);
                assert.eq(cursor.itcount(), 0);
            },
            planSummary: "COLLSCAN",
            currentOpFilter: currentOpFilter
        });

        delete TestData.commandResult;

        // Verify that an aggregation truncated by currentOp appears as { $truncated: <string>,
        // comment: <string> } when a comment parameter is present.
        truncatedQueryString =
            "^\\{ aggregate: \"currentop_query\", pipeline: \\[ \\{ \\$match: \\{ " +
            "1: \"1{149}\", 2: \"2{149}\", 3: \"3{149}\", 4: \"4{149}\", 5: \"5{149}\", " +
            "6: \"6{149}\", 7: \"7+\\.\\.\\.";

        currentOpFilter = commandOrOriginatingCommand(
            {"$truncated": {$regex: truncatedQueryString}, "comment": "currentop_query"},
            isRemoteShardCurOp);

        confirmCurrentOpContents({
            test: function(db) {
                assert.eq(
                    db.currentop_query
                        .aggregate([{$match: TestData.queryFilter}], {comment: "currentop_query"})
                        .itcount(),
                    0);
            },
            planSummary: "COLLSCAN",
            currentOpFilter: currentOpFilter
        });

        delete TestData.queryFilter;
    }
}

function currentOpCommand(inputDB, filter, truncatedOps, localOps) {
    return inputDB.currentOp(Object.assign(filter, {$truncateOps: truncatedOps}));
}

function currentOpAgg(inputDB, filter, truncatedOps, localOps) {
    return {
        inprog:
            inputDB.getSiblingDB("admin")
                .aggregate([
                    {
                        $currentOp:
                            {localOps: (localOps || false), truncateOps: (truncatedOps || false)}
                    },
                    {$match: filter}
                ])
                .toArray(),
        ok: 1
    };
}

for (let connType of [rsConn, mongosConn]) {
    for (let readMode of ["commands", "legacy"]) {
        for (let truncatedOps of [false, true]) {
            for (let localOps of [false, true]) {
                // Run all tests using the $currentOp aggregation stage.
                runTests({
                    conn: connType,
                    readMode: readMode,
                    currentOp: currentOpAgg,
                    localOps: localOps,
                    truncatedOps: truncatedOps
                });
            }
            // Run tests using the currentOp command. The 'localOps' parameter is not supported.
            runTests({
                conn: connType,
                readMode: readMode,
                currentOp: currentOpCommand,
                localOps: false,
                truncatedOps: truncatedOps
            });
        }
    }
}

st.stop();
})();