@nestjs/microservices/factories/rpc-params-factory.js

Nest - modern, fast, powerful node.js web framework (@microservices)

import { RpcParamtype } from '../enums/rpc-paramtype.enum.js';
import { isNil, isObject } from '@nestjs/common/internal';
/**
 * A key picks a property of an object payload. Of an array, a Buffer or a
 * primitive the peer sent instead, it picks only an own property (an element,
 * a length), not a prototype member: `Buffer#parent` exposes memory shared
 * with other requests, and a built-in function such as
 * `Array.prototype.values` passes for a DTO without required properties.
 * Objects keep resolving inherited properties, as a custom deserializer may
 * build class instances.
 */
const getPayloadProperty = (payload, key) => (isObject(payload) &&
    !Array.isArray(payload) &&
    !ArrayBuffer.isView(payload)) ||
    (!isNil(payload) && Object.hasOwn(Object(payload), key))
    ? payload[key]
    : undefined;
export class RpcParamsFactory {
    exchangeKeyForValue(type, data, args) {
        if (!args) {
            return null;
        }
        switch (type) {
            case RpcParamtype.PAYLOAD:
                return data ? getPayloadProperty(args[0], data) : args[0];
            case RpcParamtype.CONTEXT:
                return args[1];
            case RpcParamtype.GRPC_CALL:
                return args[2];
            default:
                return null;
        }
    }
}