feat(NODE-6337): implement client bulk write batching

src/cmap/command_monitoring_events.ts

@@ -7,7 +7,12 @@ import {
   LEGACY_HELLO_COMMAND_CAMEL_CASE
 } from '../constants';
 import { calculateDurationInMs, deepCopy } from '../utils';
-import { OpMsgRequest, type OpQueryRequest, type WriteProtocolMessageType } from './commands';
+import {
+  DocumentSequence,
+  OpMsgRequest,
+  type OpQueryRequest,
+  type WriteProtocolMessageType
+} from './commands';
 import type { Connection } from './connection';
 
 /**
@@ -249,7 +254,16 @@ const OP_QUERY_KEYS = [
 /** Extract the actual command from the query, possibly up-converting if it's a legacy format */
 function extractCommand(command: WriteProtocolMessageType): Document {
   if (command instanceof OpMsgRequest) {
-    return deepCopy(command.command);
+    const cmd = deepCopy(command.command);
+    // For OP_MSG with payload type 1 we need to pull the documents
+    // array out of the document sequence for monitoring.
+    if (cmd.ops instanceof DocumentSequence) {
+      cmd.ops = cmd.ops.documents;
+    }
+    if (cmd.nsInfo instanceof DocumentSequence) {
+      cmd.nsInfo = cmd.nsInfo.documents;
+    }
+    return cmd;
   }
 
   if (command.query?.$query) {

src/cmap/commands.ts

@@ -429,10 +429,66 @@ export interface OpMsgOptions {
 
 /** @internal */
 export class DocumentSequence {
+  field: string;
   documents: Document[];
+  serializedDocumentsLength: number;
+  private chunks: Uint8Array[];
+  private header?: Buffer;
 
-  constructor(documents: Document[]) {
-    this.documents = documents;
+  /**
+   * Create a new document sequence for the provided field.
+   * @param field - The field it will replace.
+   */
+  constructor(field: string, documents?: Document[]) {
+    this.field = field;
+    this.documents = [];
+    this.chunks = [];
+    this.serializedDocumentsLength = 0;
+    this.init();
+    if (documents) {
+      for (const doc of documents) {
+        this.push(doc, BSON.serialize(doc));
+      }
+    }
+  }
+
+  /**
+   * Initialize the buffer chunks.
+   */
+  private init() {
+    // Document sequences starts with type 1 at the first byte.
+    const buffer = Buffer.allocUnsafe(1 + 4 + this.field.length + 1);
+    buffer[0] = 1;
+    // Third part is the field name at offset 5 with trailing null byte.
+    encodeUTF8Into(buffer, `${this.field}\0`, 5);
+    this.chunks.push(buffer);
+    this.header = buffer;
+  }
+
+  /**
+   * Push a document to the document sequence. Will serialize the document
+   * as well and return the current serialized length of all documents.
+   * @param document - The document to add.
+   * @param buffer - The serialized document in raw BSON.
+   * @returns The new totoal document sequence length.
+   */
+  push(document: Document, buffer: Uint8Array): number {
+    this.serializedDocumentsLength += buffer.length;
+    // Push the document.
+    this.documents.push(document);
+    // Push the document raw bson.
+    this.chunks.push(buffer);
+    // Write the new length.
+    this.header?.writeInt32LE(4 + this.field.length + 1 + this.serializedDocumentsLength, 1);
+    return this.serializedDocumentsLength + (this.header?.length ?? 0);
+  }
+
+  /**
+   * Get the fully serialized bytes for the document sequence section.
+   * @returns The section bytes.
+   */
+  toBin(): Uint8Array {
+    return Buffer.concat(this.chunks);
   }
 }
 
@@ -543,21 +599,7 @@ export class OpMsgRequest {
     const chunks = [];
     for (const [key, value] of Object.entries(document)) {
       if (value instanceof DocumentSequence) {
-        // Document sequences starts with type 1 at the first byte.
-        const buffer = Buffer.allocUnsafe(1 + 4 + key.length);
-        buffer[0] = 1;
-        // Third part is the field name at offset 5.
-        encodeUTF8Into(buffer, key, 5);
-        chunks.push(buffer);
-        // Fourth part are the documents' bytes.
-        let docsLength = 0;
-        for (const doc of value.documents) {
-          const docBson = this.serializeBson(doc);
-          docsLength += docBson.length;
-          chunks.push(docBson);
-        }
-        // Second part of the sequence is the length at offset 1;
-        buffer.writeInt32LE(key.length + docsLength, 1);
+        chunks.push(value.toBin());
         // Why are we removing the field from the command? This is because it needs to be
         // removed in the OP_MSG request first section, and DocumentSequence is not a
         // BSON type and is specific to the MongoDB wire protocol so there's nothing

src/cmap/wire_protocol/responses.ts

@@ -329,3 +329,29 @@ export class ExplainedCursorResponse extends CursorResponse {
     return this.toObject(options);
   }
 }
+
+/**
+ * Client bulk writes have some extra metadata at the top level that needs to be
+ * included in the result returned to the user.
+ */
+export class ClientBulkWriteCursorResponse extends CursorResponse {
+  get insertedCount() {
+    return this.get('nInserted', BSONType.int, true);
+  }
+
+  get upsertedCount() {
+    return this.get('nUpserted', BSONType.int, true);
+  }
+
+  get matchedCount() {
+    return this.get('nMatched', BSONType.int, true);
+  }
+
+  get modifiedCount() {
+    return this.get('nModified', BSONType.int, true);
+  }
+
+  get deletedCount() {
+    return this.get('nDeleted', BSONType.int, true);
+  }
+}

src/cursor/client_bulk_write_cursor.ts

@@ -0,0 +1,73 @@
+import type { Document } from '../bson';
+import { type ClientBulkWriteCursorResponse } from '../cmap/wire_protocol/responses';
+import { MongoClientBulkWriteCursorError } from '../error';
+import type { MongoClient } from '../mongo_client';
+import { ClientBulkWriteOperation } from '../operations/client_bulk_write/client_bulk_write';
+import { type ClientBulkWriteOptions } from '../operations/client_bulk_write/common';
+import { executeOperation } from '../operations/execute_operation';
+import type { ClientSession } from '../sessions';
+import { mergeOptions, MongoDBNamespace } from '../utils';
+import {
+  AbstractCursor,
+  type AbstractCursorOptions,
+  type InitialCursorResponse
+} from './abstract_cursor';
+
+/** @public */
+export interface ClientBulkWriteCursorOptions
+  extends Omit<AbstractCursorOptions, 'maxAwaitTimeMS' | 'tailable' | 'awaitData'>,
+    ClientBulkWriteOptions {}
+
+/**
+ * This is the cursor that handles client bulk write operations. Note this is never
+ * exposed directly to the user and is always immediately exhausted.
+ * @internal
+ */
+export class ClientBulkWriteCursor extends AbstractCursor {
+  public readonly command: Document;
+  /** @internal */
+  private cursorResponse?: ClientBulkWriteCursorResponse;
+  /** @internal */
+  private clientBulkWriteOptions: ClientBulkWriteOptions;
+
+  /** @internal */
+  constructor(client: MongoClient, command: Document, options: ClientBulkWriteOptions = {}) {
+    super(client, new MongoDBNamespace('admin', '$cmd'), options);
+
+    this.command = command;
+    this.clientBulkWriteOptions = options;
+  }
+
+  /**
+   * We need a way to get the top level cursor response fields for
+   * generating the bulk write result, so we expose this here.
+   */
+  get response(): ClientBulkWriteCursorResponse {
+    if (this.cursorResponse) return this.cursorResponse;
+    throw new MongoClientBulkWriteCursorError(
+      'No client bulk write cursor response returned from the server.'
+    );
+  }
+
+  clone(): ClientBulkWriteCursor {
+    const clonedOptions = mergeOptions({}, this.clientBulkWriteOptions);
+    delete clonedOptions.session;
+    return new ClientBulkWriteCursor(this.client, this.command, {
+      ...clonedOptions
+    });
+  }
+
+  /** @internal */
+  async _initialize(session: ClientSession): Promise<InitialCursorResponse> {
+    const clientBulkWriteOperation = new ClientBulkWriteOperation(this.command, {
+      ...this.clientBulkWriteOptions,
+      ...this.cursorOptions,
+      session
+    });
+
+    const response = await executeOperation(this.client, clientBulkWriteOperation);
+    this.cursorResponse = response;
+
+    return { server: clientBulkWriteOperation.server, session, response };
+  }
+}

src/error.ts

@@ -616,6 +616,60 @@ export class MongoGCPError extends MongoOIDCError {
   }
 }
 
+/**
+ * An error indicating that an error occurred when processing bulk write results.
+ *
+ * @public
+ * @category Error
+ */
+export class MongoClientBulkWriteCursorError extends MongoRuntimeError {
+  /**
+   * **Do not use this constructor!**
+   *
+   * Meant for internal use only.
+   *
+   * @remarks
+   * This class is only meant to be constructed within the driver. This constructor is
+   * not subject to semantic versioning compatibility guarantees and may change at any time.
+   *
+   * @public
+   **/
+  constructor(message: string) {
+    super(message);
+  }
+
+  override get name(): string {
+    return 'MongoClientBulkWriteCursorError';
+  }
+}
+
+/**
+ * An error indicating that an error occurred on the client when executing a client bulk write.
+ *
+ * @public
+ * @category Error
+ */
+export class MongoClientBulkWriteExecutionError extends MongoRuntimeError {
+  /**
+   * **Do not use this constructor!**
+   *
+   * Meant for internal use only.
+   *
+   * @remarks
+   * This class is only meant to be constructed within the driver. This constructor is
+   * not subject to semantic versioning compatibility guarantees and may change at any time.
+   *
+   * @public
+   **/
+  constructor(message: string) {
+    super(message);
+  }
+
+  override get name(): string {
+    return 'MongoClientBulkWriteExecutionError';
+  }
+}
+
 /**
  * An error generated when a ChangeStream operation fails to execute.
  *

src/index.ts

@@ -45,6 +45,8 @@ export {
   MongoAzureError,
   MongoBatchReExecutionError,
   MongoChangeStreamError,
+  MongoClientBulkWriteCursorError,
+  MongoClientBulkWriteExecutionError,
   MongoCompatibilityError,
   MongoCursorExhaustedError,
   MongoCursorInUseError,
@@ -473,6 +475,21 @@ export type {
   AggregateOptions,
   DB_AGGREGATE_COLLECTION
 } from './operations/aggregate';
+export type {
+  AnyClientBulkWriteModel,
+  ClientBulkWriteOptions,
+  ClientBulkWriteResult,
+  ClientDeleteManyModel,
+  ClientDeleteOneModel,
+  ClientDeleteResult,
+  ClientInsertOneModel,
+  ClientInsertOneResult,
+  ClientReplaceOneModel,
+  ClientUpdateManyModel,
+  ClientUpdateOneModel,
+  ClientUpdateResult,
+  ClientWriteModel
+} from './operations/client_bulk_write/common';
 export type {
   CollationOptions,
   CommandOperation,

src/mongo_client.ts

@@ -30,6 +30,12 @@ import {
   SeverityLevel
 } from './mongo_logger';
 import { TypedEventEmitter } from './mongo_types';
+import {
+  type AnyClientBulkWriteModel,
+  type ClientBulkWriteOptions,
+  type ClientBulkWriteResult
+} from './operations/client_bulk_write/common';
+import { ClientBulkWriteExecutor } from './operations/client_bulk_write/executor';
 import { executeOperation } from './operations/execute_operation';
 import { RunAdminCommandOperation } from './operations/run_command';
 import type { ReadConcern, ReadConcernLevel, ReadConcernLike } from './read_concern';
@@ -477,6 +483,19 @@ export class MongoClient extends TypedEventEmitter<MongoClientEvents> implements
     return this.s.bsonOptions;
   }
 
+  /**
+   * Executes a client bulk write operation, available on server 8.0+.
+   * @param models - The client bulk write models.
+   * @param options - The client bulk write options.
+   * @returns A ClientBulkWriteResult for acknowledged writes and ok: 1 for unacknowledged writes.
+   */
+  async bulkWrite(
+    models: AnyClientBulkWriteModel[],
+    options?: ClientBulkWriteOptions
+  ): Promise<ClientBulkWriteResult | { ok: 1 }> {
+    return await new ClientBulkWriteExecutor(this, models, options).execute();
+  }
+
   /**
    * Connect to MongoDB using a url
    *

src/operations/client_bulk_write/client_bulk_write.ts

@@ -0,0 +1,45 @@
+import { type Document } from 'bson';
+
+import { ClientBulkWriteCursorResponse } from '../../cmap/wire_protocol/responses';
+import type { Server } from '../../sdam/server';
+import type { ClientSession } from '../../sessions';
+import { MongoDBNamespace } from '../../utils';
+import { CommandOperation } from '../command';
+import { Aspect, defineAspects } from '../operation';
+import { type ClientBulkWriteOptions } from './common';
+
+/**
+ * Executes a single client bulk write operation within a potential batch.
+ * @internal
+ */
+export class ClientBulkWriteOperation extends CommandOperation<ClientBulkWriteCursorResponse> {
+  command: Document;
+  override options: ClientBulkWriteOptions;
+
+  override get commandName() {
+    return 'bulkWrite' as const;
+  }
+
+  constructor(command: Document, options: ClientBulkWriteOptions) {
+    super(undefined, options);
+    this.command = command;
+    this.options = options;
+    this.ns = new MongoDBNamespace('admin', '$cmd');
+  }
+
+  /**
+   * Execute the command. Superclass will handle write concern, etc.
+   * @param server - The server.
+   * @param session - The session.
+   * @returns The response.
+   */
+  override async execute(
+    server: Server,
+    session: ClientSession | undefined
+  ): Promise<ClientBulkWriteCursorResponse> {
+    return await super.executeCommand(server, session, this.command, ClientBulkWriteCursorResponse);
+  }
+}
+
+// Skipping the collation as it goes on the individual ops.
+defineAspects(ClientBulkWriteOperation, [Aspect.WRITE_OPERATION, Aspect.SKIP_COLLATION]);