// db.js

let _defaultWriteConcern = {w: "majority", wtimeout: 10 * 60 * 1000};

const kWireVersionSupportingScramSha256Fallback = 15;

const DB =

globalThis.DB ??

function (mongo, name) {

this._mongo = mongo;

this._name = name;

};

/**

* Rotate certificates, CRLs, and CA files.

* @param {String} message optional message for server to log at rotation time

*/

DB.prototype.rotateCertificates = function (message) {

return this._adminCommand({rotateCertificates: 1, message});

};

/**

* @this {DB}

*/

DB.prototype.getMongo = function () {

assert(this._mongo, "why no mongo!");

return this._mongo;

};

/**

* @this {DB}

*/

DB.prototype.getSiblingDB = function (name) {

return this.getSession().getDatabase(name);

};

DB.prototype.getSisterDB = DB.prototype.getSiblingDB;

/**

* @this {DB}

*/

DB.prototype.getName = function () {

return this._name;

};

/**

* Gets DB level statistics. opt can be a number representing the scale for backwards compatibility

* or a document with options passed along to the dbstats command.

* @this {DB}

*/

DB.prototype.stats = function (opt) {

let cmd = {dbstats: 1};

if (opt === undefined) return this.runCommand(cmd);

if (typeof opt !== "object") return this.runCommand(Object.extend(cmd, {scale: opt}));

return this.runCommand(Object.extend(cmd, opt));

};

/**

* @this {DB}

*/

DB.prototype.getCollection = function (name) {

return new DBCollection(this._mongo, this, name, this._name + "." + name);

};

DB.prototype.commandHelp = function (name) {

let c = {};

c[name] = 1;

c.help = true;

let res = this.runCommand(c);

if (!res.ok) throw _getErrorWithCode(res, res.errmsg);

return res.help;

};

const kAggStagesThatNotSupportSecondaryReadPreference = new Set([

// Can't set a secondary read preference on $listClusterCatalog collection because it

// only accepts 'local' read concern.

"$listClusterCatalog",

]);

// Utility to attach readPreference if needed.

DB.prototype._attachReadPreferenceToCommand = function (cmdObj, readPref) {

"use strict";

// If the user has not set a read pref, return the original 'cmdObj'.

if (readPref === null || typeof readPref !== "object") {

return cmdObj;

}

// If user specifies $readPreference manually, then don't change it.

if (cmdObj.hasOwnProperty("$readPreference")) {

return cmdObj;

}

const cmdName = Object.keys(cmdObj)[0];

// Prevent setting `secondary` read preference if it's not allowed on specific aggregate stages.

if (

cmdName === "aggregate" &&

readPref?.mode === "secondary" &&

cmdObj.pipeline &&

Array.isArray(cmdObj.pipeline) &&

cmdObj.pipeline.length !== 0

) {

const stages = cmdObj.pipeline.map((obj) => (obj instanceof Object ? Object.keys(obj)[0] : ""));

if (stages.some((stage) => kAggStagesThatNotSupportSecondaryReadPreference.has(stage))) {

return cmdObj;

}

}

// Copy object so we don't mutate the original.

let clonedCmdObj = Object.extend({}, cmdObj);

clonedCmdObj["$readPreference"] = readPref;

return clonedCmdObj;

};

/**

* If someone passes i.e. runCommand("foo", {bar: "baz"}), we merge it in to

* runCommand({foo: 1, bar: "baz"}).

* If we already have a command object in the first argument, we ensure that the second

* argument 'extraKeys' is either null or an empty object. This prevents users from accidentally

* calling runCommand({foo: 1}, {bar: 1}) and expecting the final command invocation to be

* runCommand({foo: 1, bar: 1}).

* This helper abstracts that logic.

*/

DB.prototype._mergeCommandOptions = function (obj, extraKeys) {

"use strict";

if (typeof obj === "object") {

if (Object.keys(extraKeys || {}).length > 0) {

throw Error(

"Unexpected second argument to DB.runCommand(): (type: " + typeof extraKeys + "): " + tojson(extraKeys),

);

}

return obj;

} else if (typeof obj !== "string") {

throw Error(

"First argument to DB.runCommand() must be either an object or a string: " +

"(type: " +

typeof obj +

"): " +

tojson(obj),

);

}

let commandName = obj;

let mergedCmdObj = {};

mergedCmdObj[commandName] = 1;

if (!extraKeys) {

return mergedCmdObj;

} else if (typeof extraKeys === "object") {

// this will traverse the prototype chain of extra, but keeping

// to maintain legacy behavior

for (let key in extraKeys) {

mergedCmdObj[key] = extraKeys[key];

}

} else {

throw Error(

"Second argument to DB.runCommand(" +

commandName +

") must be an object: (type: " +

typeof extraKeys +

"): " +

tojson(extraKeys),

);

}

return mergedCmdObj;

};

// Like runCommand but applies readPreference if one has been set

// on the connection. Also sets slaveOk if a (non-primary) readPref has been set.

/**

* Run a read command with appropriate read preference.

* @this {DB}

*/

DB.prototype.runReadCommand = function (obj, extra, queryOptions) {

"use strict";

// Support users who call this function with a string commandName, e.g.

// db.runReadCommand("commandName", {arg1: "value", arg2: "value"}).

obj = this._mergeCommandOptions(obj, extra);

queryOptions = queryOptions !== undefined ? queryOptions : this.getQueryOptions();

{

const session = this.getSession();

const readPreference = session._getSessionAwareClient().getReadPreference(session);

if (readPreference !== null) {

obj = this._attachReadPreferenceToCommand(obj, readPreference);

if (readPreference.mode !== "primary") {

// Set slaveOk if readPrefMode has been explicitly set with a readPreference

// other than primary.

queryOptions |= 4;

}

}

}

// The 'extra' parameter is not used as we have already created a merged command object.

return this.runCommand(obj, null, queryOptions);

};

/**

* Run command implementation. Used internally by runCommand.

* @this {DB}

*/

DB.prototype._runCommandImpl = function (name, obj, options) {

const session = this.getSession();

const result = session._getSessionAwareClient().runCommand(session, name, obj, options);

// Set change stream version into the result object for easier assertions.

if (obj.pipeline && obj.pipeline.length > 0 && obj.pipeline[0].$changeStream) {

// TODO: SERVER-52253 Enable feature flag for Improved change stream handling of cluster topology changes.

const changeStreamVersion = obj.pipeline[0].$changeStream.version ?? "v1";

result._changeStreamVersion = changeStreamVersion;

}

return result;

};

/**

* Run a database command.

* @this {DB}

*/

DB.prototype.runCommand = function (obj, extra, queryOptions) {

"use strict";

// Support users who call this function with a string commandName, e.g.

// db.runCommand("commandName", {arg1: "value", arg2: "value"}).

let mergedObj = this._mergeCommandOptions(obj, extra);

// if options were passed (i.e. because they were overridden on a collection), use them.

// Otherwise use getQueryOptions.

let options = typeof queryOptions !== "undefined" ? queryOptions : this.getQueryOptions();

try {

return this._runCommandImpl(this._name, mergedObj, options);

} catch (ex) {

// When runCommand flowed through query, a connection error resulted in the message

// "error doing query: failed". Even though this message is arguably incorrect

// for a command failing due to a connection failure, we preserve it for backwards

// compatibility. See SERVER-18334 for details.

if (ex.hasOwnProperty("message") && ex.message.indexOf("network error") >= 0) {

throw new Error("error doing query: failed: " + ex.message);

}

throw ex;

}

};

DB.prototype._dbCommand = DB.prototype.runCommand;

DB.prototype._dbReadCommand = DB.prototype.runReadCommand;

/**

* Run a command on the admin database.

* @this {DB}

*/

DB.prototype.adminCommand = function (obj, extra) {

if (this._name == "admin") return this.runCommand(obj, extra);

return this.getSiblingDB("admin").runCommand(obj, extra);

};

DB.prototype._adminCommand = DB.prototype.adminCommand; // alias old name

DB.prototype._helloOrLegacyHello = function (args) {

let cmd = this.getMongo().getApiParameters().version ? {hello: 1} : {isMaster: 1};

if (args) {

Object.assign(cmd, args);

}

return this.runCommand(cmd);

};

DB.prototype._runCommandWithoutApiStrict = function (command) {

let commandWithoutApiStrict = {...command};

if (this.getMongo().getApiParameters().strict) {

// Permit this command invocation, even if it's not in the requested API version.

commandWithoutApiStrict["apiStrict"] = false;

}

return this.runCommand(commandWithoutApiStrict);

};

DB.prototype._runAggregate = function (cmdObj, aggregateOptions) {

assert(cmdObj.pipeline instanceof Array, "cmdObj must contain a 'pipeline' array");

assert(cmdObj.aggregate !== undefined, "cmdObj must contain 'aggregate' field");

assert(

aggregateOptions === undefined || aggregateOptions instanceof Object,

"'aggregateOptions' argument must be an object",

);

// Disallow explicit API parameters on the aggregate shell helper; callers should use runCommand

// directly if they want to test this.

assert.noAPIParams(aggregateOptions);

// Make a copy of the initial command object, i.e. {aggregate: x, pipeline: [...]}.

cmdObj = Object.extend({}, cmdObj);

// Make a copy of the aggregation options.

let optcpy = Object.extend({}, aggregateOptions || {});

if ("batchSize" in optcpy) {

if (optcpy.cursor == null) {

optcpy.cursor = {};

}

optcpy.cursor.batchSize = optcpy["batchSize"];

delete optcpy["batchSize"];

} else if ("useCursor" in optcpy) {

if (optcpy.cursor == null) {

optcpy.cursor = {};

}

delete optcpy["useCursor"];

}

const maxAwaitTimeMS = optcpy.maxAwaitTimeMS;

delete optcpy.maxAwaitTimeMS;

// Reassign the cleaned-up options.

aggregateOptions = optcpy;

// Add the options to the command object.

Object.extend(cmdObj, aggregateOptions);

if (!("cursor" in cmdObj)) {

cmdObj.cursor = {};

}

const res = this.runReadCommand(cmdObj);

assert.commandWorked(res, "aggregate failed");

if ("cursor" in res) {

let batchSizeValue = undefined;

if (cmdObj["cursor"]["batchSize"] > 0) {

batchSizeValue = cmdObj["cursor"]["batchSize"];

}

return new DBCommandCursor(this, res, batchSizeValue, maxAwaitTimeMS);

}

return res;

};

DB.prototype.aggregate = function (pipeline, aggregateOptions) {

assert(pipeline instanceof Array, "pipeline argument must be an array");

const cmdObj = this._mergeCommandOptions("aggregate", {pipeline});

return this._runAggregate(cmdObj, aggregateOptions || {});

};

/**

Create a new collection in the database. Normally, collection creation is automatic. You

would

use this function if you wish to specify special options on creation.

If the collection already exists, no action occurs.

<p>Options:</p>

<ul>

<li>

size: desired initial extent size for the collection. Must be <= 1000000000.

for fixed size (capped) collections, this size is the total/max size of the

collection.

</li>

<li>

capped: if true, this is a capped collection (where old data rolls out).

</li>

<li> max: maximum number of objects if capped (optional).</li>

<li>

storageEngine: BSON document containing storage engine specific options. Format:

{

storageEngine: {

storageEngine1: {

...

},

storageEngine2: {

...

},

...

}

}

</li>

</ul>

<p>Example:</p>

<code>db.createCollection("movies", { size: 10 * 1024 * 1024, capped:true } );</code>

* @param {String} name Name of new collection to create

* @param {Object} options Object with options for call. Options are listed above.

* @return {Object} returned has member ok set to true if operation succeeds, false otherwise.

*/

DB.prototype.createCollection = function (name, opt) {

let options = opt || {};

let cmd = {create: name};

Object.extend(cmd, options);

return this._dbCommand(cmd);

};

/**

* Command to create a view based on the specified aggregation pipeline.

* Usage: db.createView(name, viewOn, pipeline: [{ $operator: {...}}, ... ])

*

* @param name String - name of the new view to create

* @param viewOn String - name of the backing view or collection

* @param pipeline [{ $operator: {...}}, ... ] - the aggregation pipeline that defines the view

* @param options { } - options on the view, e.g., collations

*/

DB.prototype.createView = function (name, viewOn, pipeline, opt) {

let options = opt || {};

let cmd = {create: name};

if (viewOn == undefined) {

throw Error("Must specify a backing view or collection");

}

// Since we allow a single stage pipeline to be specified as an object

// in aggregation, we need to account for that here for consistency.

if (pipeline != undefined) {

if (!Array.isArray(pipeline)) {

pipeline = [pipeline];

}

}

options.pipeline = pipeline;

options.viewOn = viewOn;

Object.extend(cmd, options);

return this._dbCommand(cmd);

};

/**

* @deprecated use getProfilingStatus

* Returns the current profiling level of this database

* @return SOMETHING_FIXME or null on error

*/

DB.prototype.getProfilingLevel = function () {

let res = assert.commandWorked(this._dbCommand({profile: -1}));

return res ? res.was : null;

};

/**

* @return the current profiling status

* example { was : 0, slowms : 100 }

* @return SOMETHING_FIXME or null on error

*/

DB.prototype.getProfilingStatus = function () {

let res = this._dbCommand({profile: -1});

if (!res.ok) throw _getErrorWithCode(res, "profile command failed: " + tojson(res));

delete res.ok;

return res;

};

/**

* Erase the entire database.

* @params writeConcern: (document) expresses the write concern of the drop command.

* @return Object returned has member ok set to true if operation succeeds, false otherwise.

*/

DB.prototype.dropDatabase = function (writeConcern) {

return this._dbCommand({dropDatabase: 1, writeConcern: writeConcern ? writeConcern : _defaultWriteConcern});

};

/**

* Shuts down the database. Must be run while using the admin database.

* @param opts Options for shutdown. Possible options are:

* - force: (boolean) if the server should shut down, even if there is no

* up-to-date secondary

* - timeoutSecs: (number) the server will continue checking over timeoutSecs

* if any other servers have caught up enough for it to shut down.

*/

DB.prototype.shutdownServer = function (opts) {

if ("admin" != this._name) {

return "shutdown command only works with the admin database; try 'use admin'";

}

let cmd = {"shutdown": 1};

opts ||= {};

for (let o in opts) {

cmd[o] = opts[o];

}

try {

let res = this.runCommand(cmd);

if (!res.ok) {

throw _getErrorWithCode(res, "shutdownServer failed: " + tojson(res));

}

throw Error("shutdownServer failed: server is still up.");

} catch (e) {

// we expect the command to not return a response, as the server will shut down

// immediately.

if (isNetworkError(e)) {

print("server should be down...");

return;

}

throw e;

}

};

DB.prototype.help = function () {

print("DB methods:");

print(

"\tdb.adminCommand(nameOrDocument) - switches to 'admin' db, and runs command [just calls db.runCommand(...)]",

);

print(

"\tdb.aggregate([pipeline], {options}) - performs a collectionless aggregation on this database; returns a cursor",

);

print("\tdb.auth(username, password)");

print("\tdb.commandHelp(name) returns the help for the command");

print("\tdb.createUser(userDocument)");

print("\tdb.createView(name, viewOn, [{$operator: {...}}, ...], {viewOptions})");

print("\tdb.currentOp() displays currently executing operations in the db");

print("\tdb.dropDatabase(writeConcern)");

print("\tdb.dropUser(username)");

print("\tdb.eval() - deprecated");

print("\tdb.fsyncLock() flush data to disk and lock server for backups");

print("\tdb.fsyncUnlock() unlocks server following a db.fsyncLock()");

print("\tdb.checkMetadataConsistency() checks the consistency of the metadata in the db");

print("\tdb.getCollection(cname) same as db['cname'] or db.cname");

print(

"\tdb.getCollectionInfos([filter]) - returns a list that contains the names and options" +

" of the db's collections",

);

print("\tdb.getCollectionNames()");

print("\tdb.getLogComponents()");

print("\tdb.getMongo() get the server connection object");

print("\tdb.getMongo().setSecondaryOk() allow queries on a replication secondary server");

print("\tdb.getName()");

print("\tdb.getProfilingLevel() - deprecated");

print("\tdb.getProfilingStatus() - returns if profiling is on and slow threshold");

print("\tdb.getReplicationInfo()");

print("\tdb.getSiblingDB(name) get the db at the same server as this one");

print(

"\tdb.getWriteConcern() - returns the write concern used for any operations on this db, inherited from server object if set",

);

print("\tdb.hostInfo() get details about the server's host");

print("\tdb.isMaster() check replica primary status");

print("\tdb.hello() check replica primary status");

print("\tdb.killOp(opid) kills the current operation in the db");

print("\tdb.listCommands() lists all the db commands");

print("\tdb.loadServerScripts() loads all the scripts in db.system.js");

print("\tdb.logout()");

print("\tdb.printCollectionStats()");

print("\tdb.printReplicationInfo()");

print("\tdb.printShardingStatus()");

print("\tdb.printSecondaryReplicationInfo()");

print("\tdb.rotateCertificates(message) - rotates certificates, CRLs, and CA files and logs an optional message");

print("\tdb.runCommand(cmdObj) run a database command. if cmdObj is a string, turns it into {cmdObj: 1}");

print("\tdb.serverStatus()");

print("\tdb.setLogLevel(level,<component>)");

print("\tdb.setProfilingLevel(level,slowms) 0=off 1=slow 2=all");

print("\tdb.setVerboseShell(flag) display extra information in shell output");

print("\tdb.setWriteConcern(<write concern doc>) - sets the write concern for writes to the db");

print("\tdb.shutdownServer()");

print("\tdb.stats()");

print("\tdb.unsetWriteConcern(<write concern doc>) - unsets the write concern for writes to the db");

print("\tdb.version() current version of the server");

print(

"\tdb.watch() - opens a change stream cursor for a database to report on all " +

" changes to its non-system collections.",

);

return __magicNoPrint;

};

DB.prototype.printCollectionStats = function (scale) {

if (arguments.length > 1) {

print("printCollectionStats() has a single optional argument (scale)");

return;

}

if (typeof scale != "undefined") {

if (typeof scale != "number") {

print("scale has to be a number >= 1");

return;

}

if (scale < 1) {

print("scale has to be >= 1");

return;

}

}

let mydb = this;

this.getCollectionNames().forEach(function (z) {

print(z);

printjson(mydb.getCollection(z).stats(scale));

print("---");

});

};

/**

* Configures settings for capturing operations inside the system.profile collection and in the

* slow query log.

*

* The 'level' can be 0, 1, or 2:

* - 0 means that profiling is off and nothing will be written to system.profile.

* - 1 means that profiling is on for operations slower than the currently configured 'slowms'

* threshold (more on 'slowms' below).

* - 2 means that profiling is on for all operations, regardless of whether or not they are

* slower than 'slowms'.

*

* The 'options' parameter, if a number, is interpreted as the 'slowms' value to send to the

* server. 'slowms' determines the threshold, in milliseconds, above which slow operations get

* profiled at profiling level 1 or logged at logLevel 0.

*

* If 'options' is not a number, it is expected to be an object containing additional parameters

* to get passed to the server. For example, db.setProfilingLevel(2, {foo: "bar"}) will issue

* the command {profile: 2, foo: "bar"} to the server.

*/

DB.prototype.setProfilingLevel = function (level, options) {

if (level < 0 || level > 2) {

let errorText = "input level " + level + " is out of range [0..2]";

let errorObject = new Error(errorText);

errorObject["dbSetProfilingException"] = errorText;

throw errorObject;

}

let cmd = {profile: level};

if (isNumber(options)) {

cmd.slowms = options;

} else {

cmd = Object.extend(cmd, options);

}

return assert.commandWorked(this._dbCommand(cmd));

};

/**

* @deprecated

* <p> Evaluate a js expression at the database server.</p>

*

* <p>Useful if you need to touch a lot of data lightly; in such a scenario

* the network transfer of the data could be a bottleneck. A good example

* is "select count(*)" -- can be done server side via this mechanism.

* </p>

*

* <p>

* If the eval fails, an exception is thrown of the form:

* </p>

* <code>{ dbEvalException: { retval: functionReturnValue, ok: num [, errno: num] [, errmsg:

*str] } }</code>

*

* <p>Example: </p>

* <code>print( "mycount: " + db.eval( function(){db.mycoll.find({},{_id:ObjId()}).length();}

*);</code>

*

* @param {Function} jsfunction Javascript function to run on server. Note this it not a

*closure, but rather just "code".

* @return result of your function, or null if error

*

*/

DB.prototype.eval = function (jsfunction, ...args) {

print("WARNING: db.eval is deprecated");

let cmd = {$eval: jsfunction};

if (args.length > 0) {

cmd.args = args;

}

let res = this._dbCommand(cmd);

if (!res.ok) throw _getErrorWithCode(res, tojson(res));

return res.retval;

};

DB.prototype.dbEval = DB.prototype.eval;

/**

* <p>

* An array of grouped items is returned. The array must fit in RAM, thus this function is not

* suitable when the return set is extremely large.

* </p>

* <p>

* To order the grouped data, simply sort it client side upon return.

* <p>

Defaults

cond may be null if you want to run against all rows in the collection

keyf is a function which takes an object and returns the desired key. set either key or

keyf (not both).

* </p>

*/

DB.prototype.groupeval = function (parmsObj) {

let groupFunction = function () {

var parms = args[0]; // eslint-disable-line

let c = globalThis.db[parms.ns].find(parms.cond || {});

let map = new BSONAwareMap();

let pks = parms.key ? Object.keySet(parms.key) : null;

let pkl = pks ? pks.length : 0;

let key = {};

while (c.hasNext()) {

let obj = c.next();

if (pks) {

for (let i = 0; i < pkl; i++) {

let k = pks[i];

key[k] = obj[k];

}

} else {

key = parms.$keyf(obj);

}

let aggObj = map.get(key);

if (aggObj == null) {

let newObj = Object.extend({}, key); // clone

aggObj = Object.extend(newObj, parms.initial);

map.put(key, aggObj);

}

parms.$reduce(obj, aggObj);

}

return map.values();

};

return this.eval(groupFunction, this._groupFixParms(parmsObj));

};

DB.prototype._groupFixParms = function (parmsObj) {

let parms = Object.extend({}, parmsObj);

if (parms.reduce) {

parms.$reduce = parms.reduce; // must have $ to pass to db

delete parms.reduce;

}

if (parms.keyf) {

parms.$keyf = parms.keyf;

delete parms.keyf;

}

return parms;

};

DB.prototype.forceError = function () {

return this.runCommand({forceerror: 1});

};

DB.prototype._getCollectionInfosCommand = function (

filter,

nameOnly = false,

authorizedCollections = false,

options = {},

) {

filter ||= {};

const cmd = {

listCollections: 1,

filter,

nameOnly,

authorizedCollections,

};

const res = this.runCommand(Object.merge(cmd, options));

if (!res.ok) {

throw _getErrorWithCode(res, "listCollections failed: " + tojson(res));

}

return new DBCommandCursor(this, res).toArray().sort(compareOn("name"));

};

DB.prototype._getCollectionInfosFromPrivileges = function () {

let ret = this.runCommand({connectionStatus: 1, showPrivileges: 1});

if (!ret.ok) {

throw _getErrorWithCode(ret, "Failed to acquire collection information from privileges");

}

// Parse apart collection information.

let result = [];

let privileges = ret.authInfo.authenticatedUserPrivileges;

if (privileges === undefined) {

return result;

}

privileges.forEach((privilege) => {

let resource = privilege.resource;

if (resource === undefined) {

return;

}

let db = resource.db;

if (db === undefined || db !== this.getName()) {

return;

}

let collection = resource.collection;

if (collection === undefined || typeof collection !== "string" || collection === "") {

return;

}

result.push({name: collection});

});

return result.sort(compareOn("name"));

};

/**

* Returns a list that contains the names and options of this database's collections, sorted

* by collection name. An optional filter can be specified to match only collections with

* certain metadata.

*/

DB.prototype.getCollectionInfos = function (filter, nameOnly = false, authorizedCollections = false) {

try {

return this._getCollectionInfosCommand(filter, nameOnly, authorizedCollections);

} catch (ex) {

if (ex.code !== ErrorCodes.Unauthorized) {

// We cannot recover from this error, propagate it.

throw ex;

}

// We may be able to compute a set of *some* collections which exist and we have access

// to from our privileges. For this to work, the previous operation must have failed due

// to authorization, we must be attempting to recover the names of our own collections,

// and no filter can have been provided.

if (

nameOnly &&

authorizedCollections &&

Object.getOwnPropertyNames(filter).length === 0 &&

ex.code === ErrorCodes.Unauthorized

) {

print(

"Warning: unable to run listCollections, attempting to approximate collection names by parsing connectionStatus",

);

return this._getCollectionInfosFromPrivileges();

}

throw ex;

}

};

DB.prototype._getCollectionNamesInternal = function (options) {

return this._getCollectionInfosCommand({}, true, true, options).map(function (infoObj) {

return infoObj.name;

});

};

/**

* Returns this database's list of collection names in sorted order.

*/

DB.prototype.getCollectionNames = function () {

return this._getCollectionNamesInternal({});

};

DB.prototype.tojson = function () {

return this._name;

};

DB.prototype.toString = function () {

return this._name;

};

DB.prototype.isMaster = function () {

return this.runCommand("isMaster");

};

DB.prototype.hello = function () {

return this.runCommand("hello");

};

DB.prototype.currentOp = function (arg) {

try {

const results = this.currentOpCursor(arg).toArray();

let res = {"inprog": results.length > 0 ? results : [], "ok": 1};

Object.defineProperty(res, "fsyncLock", {

get() {

throw Error(

"fsyncLock is no longer included in the currentOp shell helper, run db.runCommand({currentOp: 1}) instead.",

);

},

});

return res;

} catch (e) {

return {"ok": 0, "code": e.code, "errmsg": "Error executing $currentOp: " + e.message};

}

};

DB.prototype.currentOpCursor = function (arg) {

let q = {};

if (arg) {

if (typeof arg == "object") Object.extend(q, arg);

else if (arg) q["$all"] = true;

}

// Convert the incoming currentOp command into an equivalent aggregate command

// of the form {aggregate:1, pipeline: [{$currentOp: {idleConnections: $all, allUsers:

// !$ownOps, truncateOps: false}}, {$match: {<user-defined filter>}}], cursor:{}}.

let pipeline = [];

let currOpArgs = {};

let currOpStage = {"$currentOp": currOpArgs};

currOpArgs["allUsers"] = !q["$ownOps"];

currOpArgs["idleConnections"] = !!q["$all"];

currOpArgs["truncateOps"] = false;

pipeline.push(currOpStage);

let matchArgs = {};

let matchStage = {"$match": matchArgs};

for (const fieldname of Object.keys(q)) {

if (fieldname !== "$all" && fieldname !== "$ownOps" && fieldname !== "$truncateOps") {

matchArgs[fieldname] = q[fieldname];

}

}

pipeline.push(matchStage);

// The legacy db.currentOp() shell helper ignored any explicitly set read preference and used

// the default, with the ability to also run on secondaries. To preserve this behavior we will

// run the aggregate with read preference "primaryPreferred".

return this.getSiblingDB("admin").aggregate(pipeline, {"$readPreference": {"mode": "primaryPreferred"}});

};

DB.prototype.killOp = function (op) {

if (!op) throw Error("no opNum to kill specified");

return this.adminCommand({"killOp": 1, op});

};

DB.prototype.killOP = DB.prototype.killOp;

DB.tsToSeconds = function (x) {

if (x.t && x.i) return x.t;

return x / 4294967296; // low 32 bits are ordinal #s within a second

};

/**

Get a replication log information summary.

<p>

This command is for the database/cloud administer and not applicable to most databases.

It is only used with the local database. One might invoke from the JS shell:

<pre>

use local

db.getReplicationInfo();

</pre>

* @return Object timeSpan: time span of the oplog from start to end if secondary is more out

* of date than that, it can't recover without a complete resync

*/

DB.prototype.getReplicationInfo = function () {

let localdb = this.getSiblingDB("local");

let result = {};

let oplog;

let localCollections = localdb.getCollectionNames();

if (localCollections.indexOf("oplog.rs") >= 0) {

oplog = "oplog.rs";

} else {

result.errmsg = "replication not detected";

return result;

}

let ol = localdb.getCollection(oplog);

let ol_stats = ol.stats();

if (ol_stats && ol_stats.maxSize) {

result.logSizeMB = ol_stats.maxSize / (1024 * 1024);

} else {

result.errmsg =

"Could not get stats for local." + oplog + " collection. " + "collstats returned: " + tojson(ol_stats);

return result;

}

result.usedMB = ol_stats.size / (1024 * 1024);

result.usedMB = Math.ceil(result.usedMB * 100) / 100;

let firstc = ol.find().sort({$natural: 1}).limit(1);

let lastc = ol.find().sort({$natural: -1}).limit(1);

if (!firstc.hasNext() || !lastc.hasNext()) {

result.errmsg = "objects not found in local.oplog.$main -- is this a new and empty db instance?";

result.oplogMainRowCount = ol.count();

return result;

}

let first = firstc.next();

let last = lastc.next();

let tfirst = first.ts;

let tlast = last.ts;

if (tfirst && tlast) {

tfirst = DB.tsToSeconds(tfirst);

tlast = DB.tsToSeconds(tlast);

result.timeDiff = tlast - tfirst;

result.timeDiffHours = Math.round(result.timeDiff / 36) / 100;

result.tFirst = new Date(tfirst * 1000).toString();

result.tLast = new Date(tlast * 1000).toString();

result.now = Date();

} else {

result.errmsg = "ts element not found in oplog objects";

}

return result;

};

DB.prototype.printReplicationInfo = function () {

let result = this.getReplicationInfo();

if (result.errmsg) {

let reply, isPrimary;

if (this.getMongo().getApiParameters().apiVersion) {

reply = this.hello();

isPrimary = reply.isWritablePrimary;

} else {

reply = this.isMaster();

isPrimary = reply.ismaster;

}

if (reply.arbiterOnly) {

print("cannot provide replication status from an arbiter.");

return;