94 lines
3.4 KiB
TypeScript
94 lines
3.4 KiB
TypeScript
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import { Inject, Injectable, Logger } from '@nestjs/common';
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import { type Dispatcher, request } from 'undici';
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import { AppConfigService } from '../config/app-config.service.js';
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import { SAP_DISPATCHER } from './sap.constants.js';
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import { describeConnectionError, toSapException } from './sap-errors.js';
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import { type SapSession, SapSessionService } from './sap-session.service.js';
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export type SapQuery = Record<string, string | number | boolean | undefined>;
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export interface SapRequest {
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method: 'GET' | 'POST' | 'PATCH' | 'PUT' | 'DELETE';
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/** Ruta relativa al Service Layer, ej. `Items('A001')` o `Orders`. */
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path: string;
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query?: SapQuery;
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body?: unknown;
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/** Cabeceras B1S-* u otras que decide quien llama. */
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headers?: Record<string, string>;
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}
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export interface SapResponse<T = unknown> {
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status: number;
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headers: Dispatcher.ResponseData['headers'];
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data: T;
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}
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/** Proxy centralizado hacia el Service Layer con reautenticación transparente. */
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@Injectable()
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export class SapClientService {
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private readonly logger = new Logger(SapClientService.name);
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constructor(
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private readonly config: AppConfigService,
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private readonly sessions: SapSessionService,
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@Inject(SAP_DISPATCHER) private readonly dispatcher: Dispatcher,
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) {}
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async request<T = unknown>(req: SapRequest): Promise<SapResponse<T>> {
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let session = await this.sessions.getSession();
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let res = await this.send(session, req);
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if (res.status === 401) {
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this.logger.warn(`Sesión SAP expirada (401) en ${req.method} ${req.path}; reautenticando`);
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session = await this.sessions.renew(session);
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res = await this.send(session, req);
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}
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if (res.status >= 400) throw toSapException(res.status, res.text);
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return {
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status: res.status,
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headers: res.headers,
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data: (res.text ? JSON.parse(res.text) : undefined) as T,
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};
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}
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get<T = unknown>(path: string, query?: SapQuery, headers?: Record<string, string>) {
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return this.request<T>({ method: 'GET', path, query, headers });
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}
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private async send(session: SapSession, req: SapRequest) {
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const timeout = this.config.get('SAPB1_SL_TIMEOUT_MS');
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const url = `${this.config.get('SAPB1_SL_URL')}/${req.path}${buildQuery(req.query)}`;
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const started = Date.now();
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try {
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const res = await request(url, {
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method: req.method,
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dispatcher: this.dispatcher,
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headers: {
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'content-type': 'application/json',
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accept: 'application/json',
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...req.headers,
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cookie: session.cookie,
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},
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body: req.body === undefined ? undefined : JSON.stringify(req.body),
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headersTimeout: timeout,
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bodyTimeout: timeout,
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});
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const text = await res.body.text();
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this.logger.debug(`${req.method} ${req.path} -> ${res.statusCode} (${Date.now() - started} ms)`);
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return { status: res.statusCode, headers: res.headers, text };
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} catch (err) {
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this.logger.error(`${req.method} ${req.path}: ${(err as Error).message}`);
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throw describeConnectionError(err);
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}
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}
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}
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/** Codifica los valores (no las claves `$filter`, `$top`...) con %20 para espacios. */
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export function buildQuery(query?: SapQuery): string {
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if (!query) return '';
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const parts = Object.entries(query)
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.filter(([, v]) => v !== undefined && v !== '')
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.map(([k, v]) => `${k}=${encodeURIComponent(String(v))}`);
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return parts.length ? `?${parts.join('&')}` : '';
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}
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