implement changes

src/admin.ts

@@ -11,11 +11,10 @@ import {
 } from './operations/list_databases';
 import { executeOperation } from './operations/execute_operation';
 import { RunCommandOperation, RunCommandOptions } from './operations/run_command';
-import type { Callback } from './utils';
+import { Callback, getTopology } from './utils';
 import type { Document } from './bson';
 import type { CommandOperationOptions } from './operations/command';
 import type { Db } from './db';
-import { getTopology } from './sdam/topology';
 
 /** @internal */
 export interface AdminPrivate {

src/bulk/common.ts

@@ -1,22 +1,23 @@
 import { PromiseProvider } from '../promise_provider';
 import { Long, ObjectId, Document } from '../bson';
-import { MongoError, MongoWriteConcernError, AnyError, MongoClientClosedError } from '../error';
+import { MongoError, MongoWriteConcernError, AnyError } from '../error';
 import {
   applyWriteConcern,
   applyRetryableWrites,
   executeLegacyOperation,
   hasAtomicOperators,
   Callback,
   MongoDBNamespace,
-  maxWireVersion
+  maxWireVersion,
+  getTopology
 } from '../utils';
 import { executeOperation } from '../operations/execute_operation';
 import { InsertOperation } from '../operations/insert';
 import { UpdateOperation } from '../operations/update';
 import { DeleteOperation } from '../operations/delete';
 import { WriteConcern } from '../write_concern';
 import type { Collection } from '../collection';
-import { getTopology, Topology } from '../sdam/topology';
+import type { Topology } from '../sdam/topology';
 import type { CommandOperationOptions } from '../operations/command';
 import type { CollationOptions } from '../cmap/wire_protocol/write_command';
 import type { Hint } from '../operations/operation';
@@ -909,7 +910,6 @@ export abstract class BulkOperationBase {
     this.isOrdered = isOrdered;
 
     const topology = getTopology(collection);
-    if (!topology) throw new MongoClientClosedError();
     options = options == null ? {} : options;
     // TODO Bring from driver information in isMaster
     // Get the namespace for the write operations

src/change_stream.ts

@@ -1,23 +1,27 @@
 import Denque = require('denque');
 import { EventEmitter } from 'events';
-import { MongoError, AnyError, isResumableError, MongoClientClosedError } from './error';
+import { MongoError, AnyError, isResumableError } from './error';
 import { Cursor, CursorOptions, CursorStream, CursorStreamOptions } from './cursor/cursor';
 import { AggregateOperation, AggregateOptions } from './operations/aggregate';
-import { loadCollection, loadDb, loadMongoClient } from './dynamic_loaders';
 import {
   relayEvents,
   maxWireVersion,
   calculateDurationInMs,
   now,
   maybePromise,
   MongoDBNamespace,
-  Callback
+  Callback,
+  getTopology
 } from './utils';
 import type { ReadPreference } from './read_preference';
 import type { Timestamp, Document } from './bson';
-import { getTopology, Topology } from './sdam/topology';
+import type { Topology } from './sdam/topology';
 import type { OperationParent } from './operations/command';
 import type { CollationOptions } from './cmap/wire_protocol/write_command';
+import { MongoClient } from './mongo_client';
+import { Db } from './db';
+import { Collection } from './collection';
+
 const kResumeQueue = Symbol('resumeQueue');
 const kCursorStream = Symbol('cursorStream');
 
@@ -171,10 +175,9 @@ export class ChangeStreamStream extends CursorStream {
 export class ChangeStream extends EventEmitter {
   pipeline: Document[];
   options: ChangeStreamOptions;
-  parent: OperationParent;
+  parent: MongoClient | Db | Collection;
   namespace: MongoDBNamespace;
   type: symbol;
-  topology: Topology;
   cursor?: ChangeStreamCursor;
   closed: boolean;
   streamOptions?: CursorStreamOptions;
@@ -211,16 +214,13 @@ export class ChangeStream extends EventEmitter {
   ) {
     super();
 
-    const Collection = loadCollection();
-    const Db = loadDb();
-    const MongoClient = loadMongoClient();
+    // const Collection = loadCollection();
+    // const Db = loadDb();
+    // const MongoClient = loadMongoClient();
 
     this.pipeline = pipeline;
     this.options = options;
 
-    this.parent = parent;
-    this.namespace = parent.s.namespace;
-
     if (parent instanceof Collection) {
       this.type = CHANGE_DOMAIN_TYPES.COLLECTION;
     } else if (parent instanceof Db) {
@@ -233,10 +233,8 @@ export class ChangeStream extends EventEmitter {
       );
     }
 
-    const topology = getTopology(parent);
-    if (!topology) throw new MongoClientClosedError();
-    this.topology = topology;
-
+    this.parent = parent;
+    this.namespace = parent.s.namespace;
     if (!this.options.readPreference && parent.readPreference) {
       this.options.readPreference = parent.readPreference;
     }
@@ -480,7 +478,7 @@ function createChangeStreamCursor(
   const pipeline = [{ $changeStream: changeStreamStageOptions } as Document].concat(self.pipeline);
   const cursorOptions = applyKnownOptions({}, options, CURSOR_OPTIONS);
   const changeStreamCursor = new ChangeStreamCursor(
-    self.topology,
+    getTopology(self.parent),
     new AggregateOperation(self.parent, pipeline, options),
     cursorOptions
   );
@@ -590,7 +588,7 @@ function processNewChange(
 }
 
 function processError(changeStream: ChangeStream, error: AnyError, callback?: Callback) {
-  const topology = changeStream.topology;
+  const topology = getTopology(changeStream.parent);
   const cursor = changeStream.cursor;
 
   // If the change stream has been closed explicitly, do not process error.

src/collection.ts

@@ -6,10 +6,11 @@ import {
   checkCollectionName,
   deprecateOptions,
   MongoDBNamespace,
-  Callback
+  Callback,
+  getTopology
 } from './utils';
 import { ObjectId, Document, BSONSerializeOptions, resolveBSONOptions } from './bson';
-import { MongoError, MongoClientClosedError } from './error';
+import { MongoError } from './error';
 import { UnorderedBulkOperation } from './bulk/unordered';
 import { OrderedBulkOperation } from './bulk/ordered';
 import { ChangeStream, ChangeStreamOptions } from './change_stream';
@@ -86,7 +87,6 @@ import type { PkFactory } from './mongo_client';
 import type { Logger, LoggerOptions } from './logger';
 import type { OperationParent } from './operations/command';
 import type { Sort } from './sort';
-import { getTopology } from './sdam/topology';
 
 /** @public */
 export interface Collection {
@@ -646,10 +646,8 @@ export class Collection implements OperationParent {
       throw new TypeError('`options` parameter must not be function');
     }
 
-    const topology = getTopology(this);
-    if (!topology) throw new MongoClientClosedError('Collection.prototype.find');
     return new Cursor(
-      topology,
+      getTopology(this),
       new FindOperation(this, this.s.namespace, filter, options),
       options
     );
@@ -858,9 +856,11 @@ export class Collection implements OperationParent {
    * @param options - Optional settings for the command
    */
   listIndexes(options?: ListIndexesOptions): CommandCursor {
-    const topology = getTopology(this);
-    if (!topology) throw new MongoClientClosedError('Collection.prototype.listIndexes');
-    const cursor = new CommandCursor(topology, new ListIndexesOperation(this, options), options);
+    const cursor = new CommandCursor(
+      getTopology(this),
+      new ListIndexesOperation(this, options),
+      options
+    );
 
     return cursor;
   }
@@ -1204,10 +1204,8 @@ export class Collection implements OperationParent {
 
     options = options || {};
 
-    const topology = getTopology(this);
-    if (!topology) throw new MongoClientClosedError('Collection.prototype.aggregate');
     return new AggregationCursor(
-      topology,
+      getTopology(this),
       new AggregateOperation(this, pipeline, options),
       options
     );

src/db.ts

@@ -4,7 +4,7 @@ import { loadAdmin } from './dynamic_loaders';
 import { AggregationCursor, CommandCursor } from './cursor';
 import { ObjectId, Code, Document, BSONSerializeOptions, resolveBSONOptions } from './bson';
 import { ReadPreference, ReadPreferenceLike } from './read_preference';
-import { MongoClientClosedError, MongoError } from './error';
+import { MongoError } from './error';
 import { Collection, CollectionOptions } from './collection';
 import { ChangeStream, ChangeStreamOptions } from './change_stream';
 import * as CONSTANTS from './constants';
@@ -15,7 +15,8 @@ import {
   filterOptions,
   mergeOptionsAndWriteConcern,
   deprecateOptions,
-  MongoDBNamespace
+  MongoDBNamespace,
+  getTopology
 } from './utils';
 import { AggregateOperation, AggregateOptions } from './operations/aggregate';
 import { AddUserOperation, AddUserOptions } from './operations/add_user';
@@ -53,7 +54,6 @@ import { executeOperation } from './operations/execute_operation';
 import { EvalOperation, EvalOptions } from './operations/eval';
 import type { IndexInformationOptions } from './operations/common_functions';
 import type { MongoClient, PkFactory } from './mongo_client';
-import { getTopology, Topology } from './sdam/topology';
 import type { OperationParent } from './operations/command';
 import type { Admin } from './admin';
 
@@ -148,11 +148,11 @@ export class Db implements OperationParent {
   /**
    * Creates a new Db instance
    *
-   * @param databaseName - The name of the database this instance represents.
    * @param client - The MongoClient for the database.
+   * @param databaseName - The name of the database this instance represents.
    * @param options - Optional settings for Db construction
    */
-  constructor(databaseName: string, client: MongoClient, options?: DbOptions) {
+  constructor(client: MongoClient, databaseName: string, options?: DbOptions) {
     options = options || {};
     emitDeprecatedOptionWarning(options, ['promiseLibrary']);
 
@@ -193,11 +193,6 @@ export class Db implements OperationParent {
     return this.s.namespace.db;
   }
 
-  // Topology
-  get topology(): Topology | undefined {
-    return this.s.client.topology;
-  }
-
   // Options
   get options(): DbOptions | undefined {
     return this.s.options;
@@ -314,10 +309,8 @@ export class Db implements OperationParent {
 
     options = options || {};
 
-    const topology = getTopology(this);
-    if (!topology) throw new MongoClientClosedError('Db.prototype.aggregate');
     const cursor = new AggregationCursor(
-      topology,
+      getTopology(this),
       new AggregateOperation(this, pipeline, options),
       options
     );
@@ -381,8 +374,7 @@ export class Db implements OperationParent {
     }
 
     // Did the user destroy the topology
-    const topology = getTopology(this);
-    if (topology && topology.isDestroyed()) {
+    if (getTopology(this).isDestroyed()) {
       return callback(new MongoError('topology was destroyed'));
     }
 
@@ -437,10 +429,8 @@ export class Db implements OperationParent {
     filter = filter || {};
     options = options || {};
 
-    const topology = getTopology(this);
-    if (!topology) throw new MongoClientClosedError('Db.prototype.listCollections');
     return new CommandCursor(
-      topology,
+      getTopology(this),
       new ListCollectionsOperation(this, filter, options),
       options
     );
@@ -785,10 +775,7 @@ export class Db implements OperationParent {
 
   /** Unref all sockets */
   unref(): void {
-    const topology = getTopology(this);
-    if (topology) {
-      topology.unref();
-    }
+    getTopology(this).unref();
   }
 
   /**

src/error.ts

@@ -124,19 +124,6 @@ export function isNetworkErrorBeforeHandshake(err: MongoNetworkError): boolean {
   return err[kBeforeHandshake] === true;
 }
 
-/**
- * An error thrown when an operation requiring a connected client was called on a closed client.
- * @public
- * @category Error
- */
-export class MongoClientClosedError extends MongoError {
-  constructor(message?: string) {
-    message = `MongoClient must be connected to perform this operation ${message}`;
-    super(message);
-    this.name = 'MongoClientClosedError';
-  }
-}
-
 /**
  * An error indicating an issue with the network, including TCP errors and timeouts.
  * @public

src/gridfs-stream/index.ts

@@ -6,7 +6,7 @@ import {
   GridFSBucketReadStreamOptionsWithRevision
 } from './download';
 import { GridFSBucketWriteStream, GridFSBucketWriteStreamOptions, TFileId } from './upload';
-import { executeLegacyOperation, Callback } from '../utils';
+import { executeLegacyOperation, Callback, getTopology } from '../utils';
 import { WriteConcernOptions, WriteConcern } from '../write_concern';
 import type { Document } from '../bson';
 import type { Db } from '../db';
@@ -16,7 +16,6 @@ import type { Cursor } from './../cursor/cursor';
 import type { FindOptions } from './../operations/find';
 import type { Sort } from '../sort';
 import type { Logger } from '../logger';
-import { getTopology } from '../sdam/topology';
 
 const DEFAULT_GRIDFS_BUCKET_OPTIONS: {
   bucketName: string;

src/mongo_client.ts

@@ -2,7 +2,7 @@ import { Db, DbOptions } from './db';
 import { EventEmitter } from 'events';
 import { ChangeStream, ChangeStreamOptions } from './change_stream';
 import { ReadPreference, ReadPreferenceMode } from './read_preference';
-import { MongoError, AnyError, MongoClientClosedError } from './error';
+import { MongoError, AnyError } from './error';
 import { WriteConcern, WriteConcernOptions } from './write_concern';
 import { maybePromise, MongoDBNamespace, Callback } from './utils';
 import { deprecate } from 'util';
@@ -403,10 +403,12 @@ export class MongoClient extends EventEmitter implements OperationParent {
     }
 
     // If no topology throw an error message
-    if (!this.topology) throw new MongoClientClosedError('MongoClient.prototype.db');
+    if (!this.topology) {
+      throw new MongoError('MongoClient must be connected before calling MongoClient.prototype.db');
+    }
 
     // Return the db object
-    const db = new Db(dbName, this, finalOptions);
+    const db = new Db(this, dbName, finalOptions);
 
     // Add the db to the cache
     this.s.dbCache.set(dbName, db);

src/operations/add_user.ts

@@ -1,12 +1,11 @@
 import * as crypto from 'crypto';
 import { Aspect, defineAspects } from './operation';
 import { CommandOperation, CommandOperationOptions } from './command';
-import { MongoClientClosedError, MongoError } from '../error';
-import type { Callback } from '../utils';
+import { MongoError } from '../error';
+import { Callback, getTopology } from '../utils';
 import type { Document } from '../bson';
 import type { Server } from '../sdam/server';
 import type { Db } from '../db';
-import { getTopology } from '../sdam/topology';
 
 /** @public */
 export interface AddUserOptions extends CommandOperationOptions {
@@ -75,9 +74,7 @@ export class AddUserOperation extends CommandOperation<AddUserOptions, Document>
       roles = ['dbOwner'];
     }
 
-    const topology = getTopology(db);
-    if (!topology) return callback(new MongoClientClosedError());
-    const digestPassword = topology.lastIsMaster().maxWireVersion >= 7;
+    const digestPassword = getTopology(db).lastIsMaster().maxWireVersion >= 7;
 
     let userPassword = password;