feat(NODE-6338): implement client bulk write error handling

src/cmap/wire_protocol/responses.ts

@@ -354,4 +354,8 @@ export class ClientBulkWriteCursorResponse extends CursorResponse {
   get deletedCount() {
     return this.get('nDeleted', BSONType.int, true);
   }
+
+  get writeConcernError() {
+    return this.get('writeConcernError', BSONType.object, false);
+  }
 }

src/cursor/client_bulk_write_cursor.ts

@@ -1,7 +1,6 @@
 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 ClientBulkWriteCommandBuilder } from '../operations/client_bulk_write/command_builder';
@@ -48,16 +47,11 @@ export class ClientBulkWriteCursor extends AbstractCursor {
    * 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 {
+  get response(): ClientBulkWriteCursorResponse | null {
     if (this.cursorResponse) return this.cursorResponse;
-    throw new MongoClientBulkWriteCursorError(
-      'No client bulk write cursor response returned from the server.'
-    );
+    return null;
   }
 
-  /**
-   * Get the last set of operations the cursor executed.
-   */
   get operations(): Document[] {
     return this.commandBuilder.lastOperations;
   }

src/error.ts

@@ -643,6 +643,33 @@ export class MongoClientBulkWriteCursorError extends MongoRuntimeError {
   }
 }
 
+/**
+ * An error indicating that an error occurred when generating a bulk write update.
+ *
+ * @public
+ * @category Error
+ */
+export class MongoClientBulkWriteUpdateError 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 'MongoClientBulkWriteUpdateError';
+  }
+}
+
 /**
  * An error indicating that an error occurred on the client when executing a client bulk write.
  *

src/index.ts

@@ -47,6 +47,7 @@ export {
   MongoChangeStreamError,
   MongoClientBulkWriteCursorError,
   MongoClientBulkWriteExecutionError,
+  MongoClientBulkWriteUpdateError,
   MongoCompatibilityError,
   MongoCursorExhaustedError,
   MongoCursorInUseError,

src/mongo_client.ts

@@ -493,6 +493,11 @@ export class MongoClient extends TypedEventEmitter<MongoClientEvents> implements
     models: AnyClientBulkWriteModel[],
     options?: ClientBulkWriteOptions
   ): Promise<ClientBulkWriteResult | { ok: 1 }> {
+    if (this.autoEncrypter) {
+      throw new MongoInvalidArgumentError(
+        'MongoClient bulkWrite does not currently support automatic encryption.'
+      );
+    }
     return await new ClientBulkWriteExecutor(this, models, options).execute();
   }
 

src/operations/client_bulk_write/client_bulk_write.ts

@@ -48,7 +48,8 @@ export class ClientBulkWriteOperation extends CommandOperation<ClientBulkWriteCu
         session.pin(connection);
         command = this.commandBuilder.buildBatch(
           connection.hello?.maxMessageSizeBytes,
-          connection.hello?.maxWriteBatchSize
+          connection.hello?.maxWriteBatchSize,
+          connection.hello?.maxBsonObjectSize
         );
       } else {
         throw new MongoClientBulkWriteExecutionError(
@@ -59,14 +60,19 @@ export class ClientBulkWriteOperation extends CommandOperation<ClientBulkWriteCu
       // At this point we have a server and the auto connect code has already
       // run in executeOperation, so the server description will be populated.
       // We can use that to build the command.
-      if (!server.description.maxWriteBatchSize || !server.description.maxMessageSizeBytes) {
+      if (
+        !server.description.maxWriteBatchSize ||
+        !server.description.maxMessageSizeBytes ||
+        !server.description.maxBsonObjectSize
+      ) {
         throw new MongoClientBulkWriteExecutionError(
-          'In order to execute a client bulk write, both maxWriteBatchSize and maxMessageSizeBytes must be provided by the servers hello response.'
+          'In order to execute a client bulk write, both maxWriteBatchSize, maxMessageSizeBytes and maxBsonObjectSize must be provided by the servers hello response.'
         );
       }
       command = this.commandBuilder.buildBatch(
         server.description.maxMessageSizeBytes,
-        server.description.maxWriteBatchSize
+        server.description.maxWriteBatchSize,
+        server.description.maxBsonObjectSize
       );
     }
     return await super.executeCommand(server, session, command, ClientBulkWriteCursorResponse);

src/operations/client_bulk_write/command_builder.ts

@@ -1,5 +1,6 @@
 import { BSON, type Document } from '../../bson';
 import { DocumentSequence } from '../../cmap/commands';
+import { MongoClientBulkWriteUpdateError, MongoInvalidArgumentError } from '../../error';
 import { type PkFactory } from '../../mongo_client';
 import type { Filter, OptionalId, UpdateFilter, WithoutId } from '../../mongo_types';
 import { DEFAULT_PK_FACTORY } from '../../utils';
@@ -82,7 +83,11 @@ export class ClientBulkWriteCommandBuilder {
    * @param maxWriteBatchSize - The max write batch size.
    * @returns The client bulk write command.
    */
-  buildBatch(maxMessageSizeBytes: number, maxWriteBatchSize: number): ClientBulkWriteCommand {
+  buildBatch(
+    maxMessageSizeBytes: number,
+    maxWriteBatchSize: number,
+    maxBsonObjectSize: number
+  ): ClientBulkWriteCommand {
     let commandLength = 0;
     let currentNamespaceIndex = 0;
     const command: ClientBulkWriteCommand = this.baseCommand();
@@ -96,7 +101,16 @@ export class ClientBulkWriteCommandBuilder {
       if (nsIndex != null) {
         // Build the operation and serialize it to get the bytes buffer.
         const operation = buildOperation(model, nsIndex, this.pkFactory);
-        const operationBuffer = BSON.serialize(operation);
+        let operationBuffer;
+        try {
+          operationBuffer = BSON.serialize(operation);
+        } catch (error) {
+          throw new MongoInvalidArgumentError(
+            `Could not serialize operation to BSON: ${error.message}.`
+          );
+        }
+
+        validateBufferSize('ops', operationBuffer, maxBsonObjectSize, maxMessageSizeBytes);
 
         // Check if the operation buffer can fit in the command. If it can,
         // then add the operation to the document sequence and increment the
@@ -119,9 +133,20 @@ export class ClientBulkWriteCommandBuilder {
         // construct our nsInfo and ops documents and buffers.
         namespaces.set(ns, currentNamespaceIndex);
         const nsInfo = { ns: ns };
-        const nsInfoBuffer = BSON.serialize(nsInfo);
         const operation = buildOperation(model, currentNamespaceIndex, this.pkFactory);
-        const operationBuffer = BSON.serialize(operation);
+        let nsInfoBuffer;
+        let operationBuffer;
+        try {
+          nsInfoBuffer = BSON.serialize(nsInfo);
+          operationBuffer = BSON.serialize(operation);
+        } catch (error) {
+          throw new MongoInvalidArgumentError(
+            `Could not serialize ns info and operation to BSON: ${error.message}.`
+          );
+        }
+
+        validateBufferSize('nsInfo', nsInfoBuffer, maxBsonObjectSize, maxMessageSizeBytes);
+        validateBufferSize('ops', operationBuffer, maxBsonObjectSize, maxMessageSizeBytes);
 
         // Check if the operation and nsInfo buffers can fit in the command. If they
         // can, then add the operation and nsInfo to their respective document
@@ -179,6 +204,25 @@ export class ClientBulkWriteCommandBuilder {
   }
 }
 
+function validateBufferSize(
+  name: string,
+  buffer: Uint8Array,
+  maxBsonObjectSize: number,
+  maxMessageSizeBytes: number
+) {
+  if (buffer.length > maxBsonObjectSize) {
+    throw new MongoInvalidArgumentError(
+      `Client bulk write operation ${name} of length ${buffer.length} exceeds the max bson object size of ${maxBsonObjectSize}`
+    );
+  }
+
+  if (buffer.length > maxMessageSizeBytes) {
+    throw new MongoInvalidArgumentError(
+      `Client bulk write operation ${name} of length ${buffer.length} exceeds the max message size size of ${maxMessageSizeBytes}`
+    );
+  }
+}
+
 /** @internal */
 interface ClientInsertOperation {
   insert: number;
@@ -293,6 +337,22 @@ export const buildUpdateManyOperation = (
   return createUpdateOperation(model, index, true);
 };
 
+/**
+ * Validate the update document.
+ * @param update - The update document.
+ */
+function validateUpdate(update: Document) {
+  const keys = Object.keys(update);
+  if (keys.length === 0) {
+    throw new MongoClientBulkWriteUpdateError('Client bulk write update models may not be empty.');
+  }
+  if (!keys[0].startsWith('$')) {
+    throw new MongoClientBulkWriteUpdateError(
+      'Client bulk write update models must only contain atomic modifiers (start with $).'
+    );
+  }
+}
+
 /**
  * Creates a delete operation based on the parameters.
  */
@@ -301,6 +361,22 @@ function createUpdateOperation(
   index: number,
   multi: boolean
 ): ClientUpdateOperation {
+  // Update documents provided in UpdateOne and UpdateMany write models are
+  // required only to contain atomic modifiers (i.e. keys that start with "$").
+  // Drivers MUST throw an error if an update document is empty or if the
+  // document's first key does not start with "$".
+  if (Array.isArray(model.update)) {
+    if (model.update.length === 0) {
+      throw new MongoClientBulkWriteUpdateError(
+        'Client bulk write update model pipelines may not be empty.'
+      );
+    }
+    for (const update of model.update) {
+      validateUpdate(update);
+    }
+  } else {
+    validateUpdate(model.update);
+  }
   const document: ClientUpdateOperation = {
     update: index,
     multi: multi,
@@ -343,6 +419,16 @@ export const buildReplaceOneOperation = (
   model: ClientReplaceOneModel,
   index: number
 ): ClientReplaceOneOperation => {
+  const keys = Object.keys(model.replacement);
+  if (keys.length === 0) {
+    throw new MongoClientBulkWriteUpdateError('Client bulk write replace models may not be empty.');
+  }
+  if (keys[0].startsWith('$')) {
+    throw new MongoClientBulkWriteUpdateError(
+      'Client bulk write replace models must not contain atomic modifiers (start with $).'
+    );
+  }
+
   const document: ClientReplaceOneOperation = {
     update: index,
     multi: false,

src/operations/client_bulk_write/common.ts

@@ -1,4 +1,5 @@
 import { type Document } from '../../bson';
+import { type ErrorDescription, type MongoRuntimeError, MongoServerError } from '../../error';
 import type { Filter, OptionalId, UpdateFilter, WithoutId } from '../../mongo_types';
 import type { CollationOptions, CommandOperationOptions } from '../../operations/command';
 import type { Hint } from '../../operations/operation';
@@ -181,6 +182,55 @@ export interface ClientBulkWriteResult {
   deleteResults?: Map<number, ClientDeleteResult>;
 }
 
+export interface ClientBulkWriteError {
+  code: number;
+  message: string;
+}
+
+/**
+ * An error indicating that an error occurred when executing the bulk write.
+ *
+ * @public
+ * @category Error
+ */
+export class MongoClientBulkWriteError extends MongoServerError {
+  /**
+   * A top-level error that occurred when attempting to communicate with the server or execute
+   * the bulk write. This value may not be populated if the exception was thrown due to errors
+   * occurring on individual writes.
+   */
+  error?: MongoRuntimeError;
+  /**
+   * Write concern errors that occurred while executing the bulk write. This list may have
+   * multiple items if more than one server command was required to execute the bulk write.
+   */
+  writeConcernErrors: Document[];
+  /**
+   * Errors that occurred during the execution of individual write operations. This map will
+   * contain at most one entry if the bulk write was ordered.
+   */
+  writeErrors: Map<number, ClientBulkWriteError>;
+  /**
+   * The results of any successful operations that were performed before the error was
+   * encountered.
+   */
+  partialResult?: ClientBulkWriteResult;
+
+  /**
+   * Initialize the client bulk write error.
+   * @param message - The error message.
+   */
+  constructor(message: ErrorDescription) {
+    super(message);
+    this.writeConcernErrors = [];
+    this.writeErrors = new Map();
+  }
+
+  override get name(): string {
+    return 'MongoClientBulkWriteError';
+  }
+}
+
 /** @public */
 export interface ClientInsertOneResult {
   /**