refactor(NODE-5473): remove unused callback inheritance in operations…

… layer (#3793)

src/operations/eval.ts

@@ -0,0 +1,74 @@
+import { Code, type Document } from '../bson';
+import type { Collection } from '../collection';
+import type { Db } from '../db';
+import { MongoServerError } from '../error';
+import { ReadPreference } from '../read_preference';
+import type { Server } from '../sdam/server';
+import type { ClientSession } from '../sessions';
+import { CommandOperation, type CommandOperationOptions } from './command';
+
+/** @public */
+export interface EvalOptions extends CommandOperationOptions {
+  nolock?: boolean;
+}
+
+/** @internal */
+export class EvalOperation extends CommandOperation<Document> {
+  override options: EvalOptions;
+  code: Code;
+  parameters?: Document | Document[];
+
+  constructor(
+    db: Db | Collection,
+    code: Code,
+    parameters?: Document | Document[],
+    options?: EvalOptions
+  ) {
+    super(db, options);
+
+    this.options = options ?? {};
+    this.code = code;
+    this.parameters = parameters;
+    // force primary read preference
+    Object.defineProperty(this, 'readPreference', {
+      value: ReadPreference.primary,
+      configurable: false,
+      writable: false
+    });
+  }
+
+  override async execute(server: Server, session: ClientSession | undefined): Promise<Document> {
+    let finalCode = this.code;
+    let finalParameters: Document[] = [];
+
+    // If not a code object translate to one
+    if (!(finalCode && (finalCode as unknown as { _bsontype: string })._bsontype === 'Code')) {
+      finalCode = new Code(finalCode as never);
+    }
+
+    // Ensure the parameters are correct
+    if (this.parameters != null && typeof this.parameters !== 'function') {
+      finalParameters = Array.isArray(this.parameters) ? this.parameters : [this.parameters];
+    }
+
+    // Create execution selector
+    const cmd: Document = { $eval: finalCode, args: finalParameters };
+
+    // Check if the nolock parameter is passed in
+    if (this.options.nolock) {
+      cmd.nolock = this.options.nolock;
+    }
+
+    // Execute the command
+    const result = await super.executeCommand(server, session, cmd);
+    if (result && result.ok === 1) {
+      return result.retval;
+    }
+
+    if (result) {
+      throw new MongoServerError({ message: `eval failed: ${result.errmsg}` });
+    }
+
+    return result;
+  }
+}