feat: add tracing suppresing for Metrics Export (open-telemetry#3332)

experimental/CHANGELOG.md

@@ -8,6 +8,7 @@ All notable changes to experimental packages in this project will be documented
 
 ### :rocket: (Enhancement)
 
+* feat(metrics-sdk): Add tracing suppresing for Metrics Export [#3332](https://github.com/open-telemetry/opentelemetry-js/pull/3332) @hectorhdzg
 * feat(instrumentation): implement `require-in-the-middle` singleton [#3161](https://github.com/open-telemetry/opentelemetry-js/pull/3161) @mhassan1
 * feat(sdk-node): configure trace exporter with environment variables [#3143](https://github.com/open-telemetry/opentelemetry-js/pull/3143) @svetlanabrennan
 * feat: enable tree shaking [#3329](https://github.com/open-telemetry/opentelemetry-js/pull/3329) @pkanal

experimental/packages/opentelemetry-sdk-metrics/src/export/PeriodicExportingMetricReader.ts

@@ -16,6 +16,7 @@
 
 import * as api from '@opentelemetry/api';
 import {
+  internal,
   ExportResultCode,
   globalErrorHandler,
   unrefTimer
@@ -85,20 +86,12 @@ export class PeriodicExportingMetricReader extends MetricReader {
       api.diag.error('PeriodicExportingMetricReader: metrics collection errors', ...errors);
     }
 
-    return new Promise((resolve, reject) => {
-      this._exporter.export(resourceMetrics, result => {
-        if (result.code !== ExportResultCode.SUCCESS) {
-          reject(
-            result.error ??
-            new Error(
-              `PeriodicExportingMetricReader: metrics export failed (error ${result.error})`
-            )
-          );
-        } else {
-          resolve();
-        }
-      });
-    });
+    const result = await internal._export(this._exporter, resourceMetrics);
+    if (result.code !== ExportResultCode.SUCCESS) {
+      throw new Error(
+        `PeriodicExportingMetricReader: metrics export failed (error ${result.error})`
+      );
+    }
   }
 
   protected override onInitialized(): void {

packages/opentelemetry-core/src/index.ts

@@ -42,3 +42,7 @@ export * from './utils/url';
 export * from './utils/wrap';
 export * from './utils/callback';
 export * from './version';
+import { _export } from './internal/exporter';
+export const internal = {
+  _export
+};

packages/opentelemetry-core/src/internal/exporter.ts

@@ -0,0 +1,38 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { context } from '@opentelemetry/api';
+import { ExportResult } from '../ExportResult';
+import { suppressTracing } from '../trace/suppress-tracing';
+
+export interface Exporter<T> {
+  export(arg: T, resultCallback: (result: ExportResult) => void): void;
+}
+
+/**
+* @internal
+* Shared functionality used by Exporters while exporting data, including suppresion of Traces.
+*/
+export function _export<T>(exporter: Exporter<T>, arg: T): Promise<ExportResult> {
+  return new Promise(resolve => {
+    // prevent downstream exporter calls from generating spans
+    context.with(suppressTracing(context.active()), () => {
+      exporter.export(arg, (result: ExportResult) => {
+        resolve(result);
+      });
+    });
+  });
+}

packages/opentelemetry-core/test/internal/exporter.test.ts

@@ -0,0 +1,43 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as assert from 'assert';
+import * as sinon from 'sinon';
+import { ExportResult, ExportResultCode } from '../../src';
+import * as suppress from '../../src/trace/suppress-tracing';
+import { _export } from '../../src/internal/exporter';
+
+describe('exporter', () => {
+  const sandbox = sinon.createSandbox();
+
+  afterEach(() => {
+    sandbox.restore();
+  });
+
+  class TestExporter {
+    export(arg: any, resultCallback: (result: ExportResult) => void) {
+      resultCallback({ code: ExportResultCode.SUCCESS });
+    }
+  }
+
+  it('_export should suppress tracing', async () => {
+    const suppressSpy = sandbox.spy(suppress, 'suppressTracing');
+    const exporter = new TestExporter();
+    const result = await _export(exporter, ['Test1']);
+    assert.strictEqual(result.code, ExportResultCode.SUCCESS);
+    assert.ok(suppressSpy.calledOnce);
+  });
+});

packages/opentelemetry-sdk-trace-base/src/export/SimpleSpanProcessor.ts

@@ -14,12 +14,13 @@
  * limitations under the License.
  */
 
-import { context, Context, TraceFlags } from '@opentelemetry/api';
+import { Context, TraceFlags } from '@opentelemetry/api';
 import {
+  internal,
   ExportResultCode,
   globalErrorHandler,
-  suppressTracing,
   BindOnceFuture,
+  ExportResult
 } from '@opentelemetry/core';
 import { Span } from '../Span';
 import { SpanProcessor } from '../SpanProcessor';
@@ -45,7 +46,7 @@ export class SimpleSpanProcessor implements SpanProcessor {
   }
 
   // does nothing.
-  onStart(_span: Span, _parentContext: Context): void {}
+  onStart(_span: Span, _parentContext: Context): void { }
 
   onEnd(span: ReadableSpan): void {
     if (this._shutdownOnce.isCalled) {
@@ -56,18 +57,17 @@ export class SimpleSpanProcessor implements SpanProcessor {
       return;
     }
 
-    // prevent downstream exporter calls from generating spans
-    context.with(suppressTracing(context.active()), () => {
-      this._exporter.export([span], result => {
-        if (result.code !== ExportResultCode.SUCCESS) {
-          globalErrorHandler(
-            result.error ??
-              new Error(
-                `SimpleSpanProcessor: span export failed (status ${result})`
-              )
-          );
-        }
-      });
+    internal._export(this._exporter, [span]).then((result: ExportResult) => {
+      if (result.code !== ExportResultCode.SUCCESS) {
+        globalErrorHandler(
+          result.error ??
+          new Error(
+            `SimpleSpanProcessor: span export failed (status ${result})`
+          )
+        );
+      }
+    }).catch(error => {
+      globalErrorHandler(error);
     });
   }