feat(deno): add langchain integration

Author: isaacs

dev-packages/deno-integration-tests/suites/orchestrion-langchain/test.ts

@@ -0,0 +1,100 @@
+// <reference lib="deno.ns" />
+
+import { tracingChannel } from 'node:diagnostics_channel';
+import type { TransactionEvent } from '@sentry/core';
+import type { DenoClient } from '@sentry/deno';
+import { getCurrentScope, getGlobalScope, getIsolationScope, init, startSpan } from '@sentry/deno';
+import { assert } from 'https://deno.land/std@0.212.0/assert/assert.ts';
+import { assertExists } from 'https://deno.land/std@0.212.0/assert/assert_exists.ts';
+import { assertEquals } from 'https://deno.land/std@0.212.0/assert/assert_equals.ts';
+
+function resetGlobals(): void {
+  getCurrentScope().clear();
+  getCurrentScope().setClient(undefined);
+  getIsolationScope().clear();
+  getGlobalScope().clear();
+}
+
+/** See deno-redis.test.ts — same sink shape, deduped for clarity. */
+function transactionSink(): {
+  beforeSendTransaction: (event: TransactionEvent) => null;
+  waitFor: (predicate: (event: TransactionEvent) => boolean) => Promise<TransactionEvent>;
+} {
+  const transactions: TransactionEvent[] = [];
+  const waiters: { predicate: (e: TransactionEvent) => boolean; resolve: (e: TransactionEvent) => void }[] = [];
+  return {
+    beforeSendTransaction(event) {
+      transactions.push(event);
+      for (let i = waiters.length - 1; i >= 0; i--) {
+        const w = waiters[i]!;
+        if (w.predicate(event)) {
+          waiters.splice(i, 1);
+          w.resolve(event);
+        }
+      }
+      return null;
+    },
+    waitFor(predicate) {
+      const already = transactions.find(predicate);
+      if (already) return Promise.resolve(already);
+      return new Promise<TransactionEvent>(resolve => {
+        waiters.push({ predicate, resolve });
+      });
+    },
+  };
+}
+
+function withTimeout<T>(p: Promise<T>, ms: number, what: string): Promise<T> {
+  let timer: ReturnType<typeof setTimeout> | undefined;
+  const timeout = new Promise<T>((_, reject) => {
+    timer = setTimeout(() => reject(new Error(`Timed out waiting for ${what} after ${ms}ms`)), ms);
+  });
+  return Promise.race([p, timeout]).finally(() => {
+    if (timer !== undefined) clearTimeout(timer);
+  });
+}
+
+Deno.test('langchain instrumentation: included in default integrations (Deno 2.8.0+)', () => {
+  resetGlobals();
+  const client = init({ dsn: 'https://username@domain/123' }) as DenoClient;
+  const names = client.getOptions().integrations.map(i => i.name);
+  assert(names.includes('LangChain'), `LangChain should be in defaults, got ${names.join(', ')}`);
+});
+
+Deno.test('langchain instrumentation: orchestrion @langchain/openai:embedQuery channel produces a nested embeddings span', async () => {
+  resetGlobals();
+  const sink = transactionSink();
+  init({
+    dsn: 'https://username@domain/123',
+    tracesSampleRate: 1,
+    beforeSendTransaction: sink.beforeSendTransaction,
+  });
+
+  const channel = tracingChannel('orchestrion:@langchain/openai:embedQuery');
+
+  // `self` is the embeddings instance: its constructor name infers the provider
+  // system and `model` names the span. `arguments[0]` is the text to embed.
+  const self = { constructor: { name: 'OpenAIEmbeddings' }, model: 'text-embedding-3-small' };
+  const ctx: Record<string, unknown> = { self, arguments: ['hello world'] };
+
+  startSpan({ name: 'parent', op: 'test' }, () => {
+    channel.start.runStores(ctx, () => undefined);
+    channel.end.publish(ctx);
+    ctx.result = [0.1, 0.2, 0.3];
+    channel.asyncEnd.publish(ctx);
+  });
+
+  const parent = await withTimeout(
+    sink.waitFor(t => t.transaction === 'parent'),
+    5000,
+    "'parent' transaction",
+  );
+
+  const aiSpan = parent.spans?.find(s => s.op === 'gen_ai.embeddings');
+  assertExists(aiSpan, `expected a gen_ai.embeddings child span, got ops: ${parent.spans?.map(s => s.op).join(', ')}`);
+  assertEquals(aiSpan!.description, 'embeddings text-embedding-3-small');
+  assertEquals(aiSpan!.data?.['gen_ai.system'], 'openai');
+  assertEquals(aiSpan!.data?.['gen_ai.operation.name'], 'embeddings');
+  assertEquals(aiSpan!.data?.['gen_ai.request.model'], 'text-embedding-3-small');
+  assertEquals(aiSpan!.data?.['sentry.origin'], 'auto.ai.langchain');
+});

packages/deno/src/index.ts

@@ -129,6 +129,7 @@ export {
   kafkajsChannelIntegration,
   knexChannelIntegration,
   koaChannelIntegration,
+  langChainChannelIntegration,
   lruMemoizerChannelIntegration,
   mongodbChannelIntegration,
   mongooseChannelIntegration,

packages/deno/src/sdk.ts

@@ -23,6 +23,7 @@ import {
   hapiChannelIntegration,
   kafkajsChannelIntegration,
   koaChannelIntegration,
+  langChainChannelIntegration,
   lruMemoizerChannelIntegration,
   mongodbChannelIntegration,
   mongooseChannelIntegration,
@@ -107,6 +108,7 @@ export function getDefaultIntegrations(_options: Options): Integration[] {
           hapiChannelIntegration(),
           kafkajsChannelIntegration(),
           koaChannelIntegration(),
+          langChainChannelIntegration(),
           lruMemoizerChannelIntegration(),
           mongodbChannelIntegration(),
           mongooseChannelIntegration(),

packages/deno/test/__snapshots__/mod.test.ts.snap

@@ -127,6 +127,7 @@ snapshot[`captureException 1`] = `
       "Hapi",
       "Kafka",
       "Koa",
+      "LangChain",
       "LruMemoizer",
       "Mongo",
       "Mongoose",
@@ -223,6 +224,7 @@ snapshot[`captureMessage 1`] = `
       "Hapi",
       "Kafka",
       "Koa",
+      "LangChain",
       "LruMemoizer",
       "Mongo",
       "Mongoose",
@@ -326,6 +328,7 @@ snapshot[`captureMessage twice 1`] = `
       "Hapi",
       "Kafka",
       "Koa",
+      "LangChain",
       "LruMemoizer",
       "Mongo",
       "Mongoose",
@@ -436,6 +439,7 @@ snapshot[`captureMessage twice 2`] = `
       "Hapi",
       "Kafka",
       "Koa",
+      "LangChain",
       "LruMemoizer",
       "Mongo",
       "Mongoose",