55 lines
2 KiB
JavaScript
55 lines
2 KiB
JavaScript
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class MockAsyncLocalStorage {
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getStore() {
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return undefined;
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}
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run(_, callback) {
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return callback();
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}
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}
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const TRACING_ALS_KEY = Symbol.for("ls:tracing_async_local_storage");
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const mockAsyncLocalStorage = new MockAsyncLocalStorage();
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class AsyncLocalStorageProvider {
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getInstance() {
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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return globalThis[TRACING_ALS_KEY] ?? mockAsyncLocalStorage;
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}
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initializeGlobalInstance(instance) {
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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if (globalThis[TRACING_ALS_KEY] === undefined) {
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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globalThis[TRACING_ALS_KEY] = instance;
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}
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}
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}
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export const AsyncLocalStorageProviderSingleton = new AsyncLocalStorageProvider();
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/**
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* Return the current run tree from within a traceable-wrapped function.
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* Will throw an error if called outside of a traceable function.
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*
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* @returns The run tree for the given context.
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*/
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export const getCurrentRunTree = () => {
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const runTree = AsyncLocalStorageProviderSingleton.getInstance().getStore();
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if (runTree === undefined) {
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throw new Error([
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"Could not get the current run tree.",
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"",
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"Please make sure you are calling this method within a traceable function or the tracing is enabled.",
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].join("\n"));
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}
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return runTree;
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};
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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export function withRunTree(runTree, fn) {
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const storage = AsyncLocalStorageProviderSingleton.getInstance();
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return new Promise((resolve, reject) => {
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storage.run(runTree, () => void Promise.resolve(fn()).then(resolve).catch(reject));
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});
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}
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export const ROOT = Symbol.for("langsmith:traceable:root");
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export function isTraceableFunction(x
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// eslint-disable-next-line @typescript-eslint/no-explicit-any
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) {
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return typeof x === "function" && "langsmith:traceable" in x;
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}
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