Marc Mintel
5397309103
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58 lines
2.9 KiB
Plaintext
58 lines
2.9 KiB
Plaintext
"use strict";
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/*
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* Copyright The OpenTelemetry Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.LruMemoizerInstrumentation = void 0;
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const api_1 = require("@opentelemetry/api");
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const instrumentation_1 = require("@opentelemetry/instrumentation");
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/** @knipignore */
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const version_1 = require("./version");
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class LruMemoizerInstrumentation extends instrumentation_1.InstrumentationBase {
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constructor(config = {}) {
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super(version_1.PACKAGE_NAME, version_1.PACKAGE_VERSION, config);
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}
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init() {
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return [
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new instrumentation_1.InstrumentationNodeModuleDefinition('lru-memoizer', ['>=1.3 <3'], moduleExports => {
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// moduleExports is a function which receives an options object,
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// and returns a "memoizer" function upon invocation.
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// We want to patch this "memoizer's" internal function
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const asyncMemoizer = function () {
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// This following function is invoked every time the user wants to get a (possible) memoized value
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// We replace it with another function in which we bind the current context to the last argument (callback)
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const origMemoizer = moduleExports.apply(this, arguments);
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return function () {
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const modifiedArguments = [...arguments];
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// last argument is the callback
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const origCallback = modifiedArguments.pop();
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const callbackWithContext = typeof origCallback === 'function'
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? api_1.context.bind(api_1.context.active(), origCallback)
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: origCallback;
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modifiedArguments.push(callbackWithContext);
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return origMemoizer.apply(this, modifiedArguments);
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};
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};
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// sync function preserves context, but we still need to export it
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// as the lru-memoizer package does
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asyncMemoizer.sync = moduleExports.sync;
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return asyncMemoizer;
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}, undefined // no need to disable as this instrumentation does not create any spans
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),
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];
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}
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}
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exports.LruMemoizerInstrumentation = LruMemoizerInstrumentation;
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//# sourceMappingURL=instrumentation.js.map |