@opentelemetry/instrumentation-express/build/src/internal-types.js

OpenTelemetry instrumentation for `express` http web application framework

"use strict";
/*
 * Copyright The OpenTelemetry Authors
 * SPDX-License-Identifier: Apache-2.0
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports._LAYERS_STORE_PROPERTY = exports.kLayerPatched = void 0;
/**
 * This symbol is used to mark express layer as being already instrumented
 * since its possible to use a given layer multiple times (ex: middlewares)
 */
exports.kLayerPatched = Symbol('express-layer-patched');
/**
 * This const define where on the `request` object the Instrumentation will mount the
 * current stack of express layer.
 *
 * It is necessary because express doesn't store the different layers
 * (ie: middleware, router etc) that it called to get to the current layer.
 * Given that, the only way to know the route of a given layer is to
 * store the path of where each previous layer has been mounted.
 *
 * ex: bodyParser > auth middleware > /users router > get /:id
 *  in this case the stack would be: ["/users", "/:id"]
 *
 * ex2: bodyParser > /api router > /v1 router > /users router > get /:id
 *  stack: ["/api", "/v1", "/users", ":id"]
 *
 */
exports._LAYERS_STORE_PROPERTY = '__ot_middlewares';
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