nestjs-otel/lib/wide-events/wide-event.middleware.js

NestJS OpenTelemetry Library

"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.WideEventMiddleware = void 0;
const common_1 = require("@nestjs/common");
const api_1 = require("@opentelemetry/api");
const wide_event_context_1 = require("./wide-event.context");
/**
 * Captures the span active at the start of the request (the HTTP server /
 * local-root span, before Nest instrumentation nests guard/interceptor/handler
 * spans) and stashes it on the request so the WideEventInterceptor can flush
 * accumulated attributes onto the root span rather than a nested child.
 *
 * Applied automatically by the OpenTelemetry module for HTTP apps.
 *
 * @publicApi
 */
let WideEventMiddleware = class WideEventMiddleware {
    use(req, _res, next) {
        const span = api_1.trace.getSpan(api_1.context.active());
        if (span) {
            req[wide_event_context_1.WIDE_EVENT_ROOT_SPAN] = span;
        }
        next();
    }
};
exports.WideEventMiddleware = WideEventMiddleware;
exports.WideEventMiddleware = WideEventMiddleware = __decorate([
    (0, common_1.Injectable)()
], WideEventMiddleware);