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feat(node-tracer): use AsyncLocalStorageContextManager by default starting Node 14.8 #1511 #1525

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merged 4 commits into from Oct 1, 2020
Merged

feat(node-tracer): use AsyncLocalStorageContextManager by default starting Node 14.8 #1511 #1525

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75e551d
feat(node-tracer): use AsyncLocalStorageContextManager by default sta…
vmarchaud Sep 13, 2020
7834677
Merge branch 'master' into use-als-by-default
vmarchaud Sep 19, 2020
02c2997
Merge branch 'master' into use-als-by-default
vmarchaud Sep 23, 2020
ec17416
Merge branch 'master' into use-als-by-default
dyladan Oct 1, 2020
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11 changes: 9 additions & 2 deletions packages/opentelemetry-node/src/NodeTracerProvider.ts
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Expand Up @@ -14,13 +14,17 @@
* limitations under the License.
*/

import { AsyncHooksContextManager } from '@opentelemetry/context-async-hooks';
import {
AsyncHooksContextManager,
AsyncLocalStorageContextManager,
} from '@opentelemetry/context-async-hooks';
import {
BasicTracerProvider,
SDKRegistrationConfig,
} from '@opentelemetry/tracing';
import { DEFAULT_INSTRUMENTATION_PLUGINS, NodeTracerConfig } from './config';
import { PluginLoader, Plugins } from './instrumentation/PluginLoader';
import * as semver from 'semver';

/**
* Register this TracerProvider for use with the OpenTelemetry API.
Expand Down Expand Up @@ -53,7 +57,10 @@ export class NodeTracerProvider extends BasicTracerProvider {

register(config: SDKRegistrationConfig = {}) {
if (config.contextManager === undefined) {
config.contextManager = new AsyncHooksContextManager();
const ContextManager = semver.gte(process.version, '14.8.0')
? AsyncLocalStorageContextManager
: AsyncHooksContextManager;
config.contextManager = new ContextManager();
config.contextManager.enable();
}

Expand Down
18 changes: 11 additions & 7 deletions packages/opentelemetry-node/test/registration.test.ts
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Expand Up @@ -21,11 +21,19 @@ import {
trace,
ProxyTracerProvider,
} from '@opentelemetry/api';
import { AsyncHooksContextManager } from '@opentelemetry/context-async-hooks';
import {
AsyncHooksContextManager,
AsyncLocalStorageContextManager,
} from '@opentelemetry/context-async-hooks';
import { NoopContextManager } from '@opentelemetry/context-base';
import { CompositePropagator } from '@opentelemetry/core';
import * as assert from 'assert';
import { NodeTracerProvider } from '../src';
import * as semver from 'semver';

const DefaultContextManager = semver.gte(process.version, '14.8.0')
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should we rather check if AsyncLocalStorageContextManager is available (feature detection) instead of checking the version using semver. If you already require that it means it will be undefined for lower versions

const DefaultContextManager = AsyncLocalStorageContextManager || AsyncHooksContextManager

should be enough ?

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In the description he mentioned that there is a bug in versions before 14.8. Feature detection would still detect that local storage is available, but he suggests we would want to use the async hooks version anyways.

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sry haven't spotted that

? AsyncLocalStorageContextManager
: AsyncHooksContextManager;

describe('API registration', () => {
beforeEach(() => {
Expand All @@ -38,9 +46,7 @@ describe('API registration', () => {
const tracerProvider = new NodeTracerProvider();
tracerProvider.register();

assert.ok(
context['_getContextManager']() instanceof AsyncHooksContextManager
);
assert.ok(context['_getContextManager']() instanceof DefaultContextManager);
assert.ok(
propagation['_getGlobalPropagator']() instanceof CompositePropagator
);
Expand Down Expand Up @@ -96,9 +102,7 @@ describe('API registration', () => {
propagation['_getGlobalPropagator']() instanceof NoopTextMapPropagator
);

assert.ok(
context['_getContextManager']() instanceof AsyncHooksContextManager
);
assert.ok(context['_getContextManager']() instanceof DefaultContextManager);

const apiTracerProvider = trace.getTracerProvider();
assert.ok(apiTracerProvider instanceof ProxyTracerProvider);
Expand Down
13 changes: 10 additions & 3 deletions packages/opentelemetry-sdk-node/test/sdk.test.ts
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Expand Up @@ -26,7 +26,10 @@ import {
trace,
ProxyTracerProvider,
} from '@opentelemetry/api';
import { AsyncHooksContextManager } from '@opentelemetry/context-async-hooks';
import {
AsyncHooksContextManager,
AsyncLocalStorageContextManager,
} from '@opentelemetry/context-async-hooks';
import { NoopContextManager } from '@opentelemetry/context-base';
import { CompositePropagator } from '@opentelemetry/core';
import { ConsoleMetricExporter, MeterProvider } from '@opentelemetry/metrics';
Expand Down Expand Up @@ -81,6 +84,10 @@ const mockedIdentityResponse = {
};
const mockedHostResponse = 'my-hostname';

const DefaultContextManager = semver.gte(process.version, '14.8.0')
? AsyncLocalStorageContextManager
: AsyncHooksContextManager;

describe('Node SDK', () => {
before(() => {
// Disable attempted load of default plugins
Expand Down Expand Up @@ -127,7 +134,7 @@ describe('Node SDK', () => {
assert.ok(metrics.getMeterProvider() instanceof NoopMeterProvider);

assert.ok(
context['_getContextManager']() instanceof AsyncHooksContextManager
context['_getContextManager']() instanceof DefaultContextManager
);
assert.ok(
propagation['_getGlobalPropagator']() instanceof CompositePropagator
Expand All @@ -151,7 +158,7 @@ describe('Node SDK', () => {
assert.ok(metrics.getMeterProvider() instanceof NoopMeterProvider);

assert.ok(
context['_getContextManager']() instanceof AsyncHooksContextManager
context['_getContextManager']() instanceof DefaultContextManager
);
assert.ok(
propagation['_getGlobalPropagator']() instanceof CompositePropagator
Expand Down