feat(unstable): replace SpanExporter with TracerProvider (#27473)

cli/main.rs

@@ -447,8 +447,9 @@ fn resolve_flags_and_init(
     }
   };
 
-  deno_telemetry::init(crate::args::otel_runtime_config())?;
-  util::logger::init(flags.log_level, Some(flags.otel_config()));
+  let otel_config = flags.otel_config();
+  deno_telemetry::init(crate::args::otel_runtime_config(), &otel_config)?;
+  util::logger::init(flags.log_level, Some(otel_config));
 
   // TODO(bartlomieju): remove in Deno v2.5 and hard error then.
   if flags.unstable_config.legacy_flag_enabled {

cli/mainrt.rs

@@ -89,7 +89,10 @@ fn main() {
   let future = async move {
     match standalone {
       Ok(Some(data)) => {
-        deno_telemetry::init(crate::args::otel_runtime_config())?;
+        deno_telemetry::init(
+          crate::args::otel_runtime_config(),
+          &data.metadata.otel_config,
+        )?;
         util::logger::init(
           data.metadata.log_level,
           Some(data.metadata.otel_config.clone()),

cli/tsc/dts/lib.deno.unstable.d.ts

@@ -1301,20 +1301,43 @@ declare namespace Deno {
    */
   export namespace telemetry {
     /**
-     * A SpanExporter compatible with OpenTelemetry.js
-     * https://open-telemetry.github.io/opentelemetry-js/interfaces/_opentelemetry_sdk_trace_base.SpanExporter.html
+     * A TracerProvider compatible with OpenTelemetry.js
+     * https://open-telemetry.github.io/opentelemetry-js/interfaces/_opentelemetry_api.TracerProvider.html
+     *
+     * This is a singleton object that implements the OpenTelemetry
+     * TracerProvider interface.
+     *
      * @category Telemetry
      * @experimental
      */
-    export class SpanExporter {}
+    // deno-lint-ignore no-explicit-any
+    export const tracerProvider: any;
 
     /**
      * A ContextManager compatible with OpenTelemetry.js
      * https://open-telemetry.github.io/opentelemetry-js/interfaces/_opentelemetry_api.ContextManager.html
+     *
+     * This is a singleton object that implements the OpenTelemetry
+     * ContextManager interface.
+     *
+     * @category Telemetry
+     * @experimental
+     */
+    // deno-lint-ignore no-explicit-any
+    export const contextManager: any;
+
+    /**
+     * A MeterProvider compatible with OpenTelemetry.js
+     * https://open-telemetry.github.io/opentelemetry-js/interfaces/_opentelemetry_api.MeterProvider.html
+     *
+     * This is a singleton object that implements the OpenTelemetry
+     * MeterProvider interface.
+     *
      * @category Telemetry
      * @experimental
      */
-    export class ContextManager {}
+    // deno-lint-ignore no-explicit-any
+    export const meterProvider: any;
 
     export {}; // only export exports
   }

ext/fetch/26_fetch.js

@@ -59,10 +59,9 @@ import {
 } from "ext:deno_fetch/23_response.js";
 import * as abortSignal from "ext:deno_web/03_abort_signal.js";
 import {
-  endSpan,
+  builtinTracer,
   enterSpan,
-  exitSpan,
-  Span,
+  restoreContext,
   TRACING_ENABLED,
 } from "ext:deno_telemetry/telemetry.ts";
 import {
@@ -320,10 +319,10 @@ function httpRedirectFetch(request, response, terminator) {
   // Drop confidential headers when redirecting to a less secure protocol
   // or to a different domain that is not a superdomain
   if (
-    locationURL.protocol !== currentURL.protocol &&
-      locationURL.protocol !== "https:" ||
-    locationURL.host !== currentURL.host &&
-      !isSubdomain(locationURL.host, currentURL.host)
+    (locationURL.protocol !== currentURL.protocol &&
+      locationURL.protocol !== "https:") ||
+    (locationURL.host !== currentURL.host &&
+      !isSubdomain(locationURL.host, currentURL.host))
   ) {
     for (let i = 0; i < request.headerList.length; i++) {
       if (
@@ -352,10 +351,11 @@ function httpRedirectFetch(request, response, terminator) {
  */
 function fetch(input, init = { __proto__: null }) {
   let span;
+  let context;
   try {
     if (TRACING_ENABLED) {
-      span = new Span("fetch", { kind: 2 });
-      enterSpan(span);
+      span = builtinTracer().startSpan("fetch", { kind: 2 });
+      context = enterSpan(span);
     }
 
     // There is an async dispatch later that causes a stack trace disconnect.
@@ -454,9 +454,7 @@ function fetch(input, init = { __proto__: null }) {
           await opPromise;
           return result;
         } finally {
-          if (span) {
-            endSpan(span);
-          }
+          span?.end();
         }
       })();
     }
@@ -469,19 +467,17 @@ function fetch(input, init = { __proto__: null }) {
       // XXX: This should always be true, otherwise `opPromise` would be present.
       if (op_fetch_promise_is_settled(result)) {
         // It's already settled.
-        endSpan(span);
+        span?.end();
       } else {
         // Not settled yet, we can return a new wrapper promise.
         return SafePromisePrototypeFinally(result, () => {
-          endSpan(span);
+          span?.end();
         });
       }
     }
     return result;
   } finally {
-    if (span) {
-      exitSpan(span);
-    }
+    if (context) restoreContext(context);
   }
 }
 
@@ -508,8 +504,11 @@ function abortFetch(request, responseObject, error) {
  */
 function isSubdomain(subdomain, domain) {
   const dot = subdomain.length - domain.length - 1;
-  return dot > 0 && subdomain[dot] === "." &&
-    StringPrototypeEndsWith(subdomain, domain);
+  return (
+    dot > 0 &&
+    subdomain[dot] === "." &&
+    StringPrototypeEndsWith(subdomain, domain)
+  );
 }
 
 /**

ext/http/00_serve.ts

@@ -43,10 +43,7 @@ const {
   Uint8Array,
   Promise,
 } = primordials;
-const {
-  getAsyncContext,
-  setAsyncContext,
-} = core;
+const { getAsyncContext, setAsyncContext } = core;
 
 import { InnerBody } from "ext:deno_fetch/22_body.js";
 import { Event } from "ext:deno_web/02_event.js";
@@ -90,9 +87,8 @@ import {
 import { hasTlsKeyPairOptions, listenTls } from "ext:deno_net/02_tls.js";
 import { SymbolAsyncDispose } from "ext:deno_web/00_infra.js";
 import {
-  endSpan,
+  builtinTracer,
   enterSpan,
-  Span,
   TRACING_ENABLED,
 } from "ext:deno_telemetry/telemetry.ts";
 import {
@@ -288,28 +284,28 @@ class InnerRequest {
 
     // * is valid for OPTIONS
     if (path === "*") {
-      return this.#urlValue = "*";
+      return (this.#urlValue = "*");
     }
 
     // If the path is empty, return the authority (valid for CONNECT)
     if (path == "") {
-      return this.#urlValue = this.#methodAndUri[1];
+      return (this.#urlValue = this.#methodAndUri[1]);
     }
 
     // CONNECT requires an authority
     if (this.#methodAndUri[0] == "CONNECT") {
-      return this.#urlValue = this.#methodAndUri[1];
+      return (this.#urlValue = this.#methodAndUri[1]);
     }
 
     const hostname = this.#methodAndUri[1];
     if (hostname) {
       // Construct a URL from the scheme, the hostname, and the path
-      return this.#urlValue = this.#context.scheme + hostname + path;
+      return (this.#urlValue = this.#context.scheme + hostname + path);
     }
 
     // Construct a URL from the scheme, the fallback hostname, and the path
-    return this.#urlValue = this.#context.scheme + this.#context.fallbackHost +
-      path;
+    return (this.#urlValue = this.#context.scheme + this.#context.fallbackHost +
+      path);
   }
 
   get completed() {
@@ -414,10 +410,7 @@ class InnerRequest {
       return;
     }
 
-    PromisePrototypeThen(
-      op_http_request_on_cancel(this.#external),
-      callback,
-    );
+    PromisePrototypeThen(op_http_request_on_cancel(this.#external), callback);
   }
 }
 
@@ -521,12 +514,7 @@ function fastSyncResponseOrStream(
     autoClose = true;
   }
   PromisePrototypeThen(
-    op_http_set_response_body_resource(
-      req,
-      rid,
-      autoClose,
-      status,
-    ),
+    op_http_set_response_body_resource(req, rid, autoClose, status),
     (success) => {
       innerRequest?.close(success);
       op_http_close_after_finish(req);
@@ -556,10 +544,7 @@ function mapToCallback(context, callback, onError) {
         updateSpanFromRequest(span, request);
       }
 
-      response = await callback(
-        request,
-        new ServeHandlerInfo(innerRequest),
-      );
+      response = await callback(request, new ServeHandlerInfo(innerRequest));
 
       // Throwing Error if the handler return value is not a Response class
       if (!ObjectPrototypeIsPrototypeOf(ResponsePrototype, response)) {
@@ -636,12 +621,12 @@ function mapToCallback(context, callback, onError) {
     mapped = function (req, _span) {
       const oldCtx = getAsyncContext();
       setAsyncContext(context.asyncContext);
-      const span = new Span("deno.serve", { kind: 1 });
+      const span = builtinTracer().startSpan("deno.serve", { kind: 1 });
       try {
         enterSpan(span);
         return SafePromisePrototypeFinally(
           origMapped(req, span),
-          () => endSpan(span),
+          () => span.end(),
         );
       } finally {
         // equiv to exitSpan.
@@ -688,7 +673,7 @@ function formatHostName(hostname: string): string {
   // because browsers in Windows don't resolve "0.0.0.0".
   // See the discussion in https://github.com/denoland/deno_std/issues/1165
   if (
-    (Deno.build.os === "windows") &&
+    Deno.build.os === "windows" &&
     (hostname == "0.0.0.0" || hostname == "::")
   ) {
     return "localhost";
@@ -730,11 +715,12 @@ function serve(arg1, arg2) {
   const wantsHttps = hasTlsKeyPairOptions(options);
   const wantsUnix = ObjectHasOwn(options, "path");
   const signal = options.signal;
-  const onError = options.onError ?? function (error) {
-    // deno-lint-ignore no-console
-    console.error(error);
-    return internalServerError();
-  };
+  const onError = options.onError ??
+    function (error) {
+      // deno-lint-ignore no-console
+      console.error(error);
+      return internalServerError();
+    };
 
   if (wantsUnix) {
     const listener = listen({
@@ -843,10 +829,7 @@ function serveHttpOn(context, addr, callback) {
   const promiseErrorHandler = (error) => {
     // Abnormal exit
     // deno-lint-ignore no-console
-    console.error(
-      "Terminating Deno.serve loop due to unexpected error",
-      error,
-    );
+    console.error("Terminating Deno.serve loop due to unexpected error", error);
     context.close();
   };
 
@@ -964,7 +947,7 @@ function registerDeclarativeServer(exports) {
         port: servePort,
         hostname: serveHost,
         [kLoadBalanced]: (serveIsMain && serveWorkerCount > 1) ||
-          (serveWorkerCount !== null),
+          serveWorkerCount !== null,
         onListen: ({ port, hostname }) => {
           if (serveIsMain) {
             const nThreads = serveWorkerCount > 1