79 lines
2.1 KiB
TypeScript
79 lines
2.1 KiB
TypeScript
import * as plugins from '../../plugins.js';
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import type { ICommandHandler, IHandlerContext } from '../CommandRouter.js';
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/**
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* HelloHandler - Handles hello/isMaster handshake commands
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*
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* This is the first command sent by MongoDB drivers to establish a connection.
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* It returns server capabilities and configuration.
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*/
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export class HelloHandler implements ICommandHandler {
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async handle(context: IHandlerContext): Promise<plugins.bson.Document> {
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const { command, server } = context;
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// Build response with server capabilities
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const response: plugins.bson.Document = {
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ismaster: true,
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ok: 1,
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// Maximum sizes
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maxBsonObjectSize: 16777216, // 16 MB
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maxMessageSizeBytes: 48000000, // 48 MB
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maxWriteBatchSize: 100000, // 100k documents per batch
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// Timestamps
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localTime: new Date(),
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// Session support
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logicalSessionTimeoutMinutes: 30,
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// Connection info
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connectionId: 1,
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// Wire protocol versions (support MongoDB 3.6 through 7.0)
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minWireVersion: 0,
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maxWireVersion: 21,
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// Server mode
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readOnly: false,
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// Topology info (standalone mode)
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isWritablePrimary: true,
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// Additional info
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topologyVersion: {
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processId: new plugins.bson.ObjectId(),
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counter: plugins.bson.Long.fromNumber(0),
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},
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};
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// Handle hello-specific fields
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if (command.hello || command.hello === 1) {
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response.helloOk = true;
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}
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// Handle client metadata
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if (command.client) {
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// Client is providing metadata about itself
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// We just acknowledge it - no need to do anything special
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}
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// Handle SASL mechanisms query
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if (command.saslSupportedMechs) {
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response.saslSupportedMechs = [
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// We don't actually support auth, but the driver needs to see this
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];
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}
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// Compression support (none for now)
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if (command.compression) {
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response.compression = [];
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}
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// Server version info
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response.version = '7.0.0';
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return response;
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}
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}
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