@opentelemetry/instrumentation-ioredis

What is @opentelemetry/instrumentation-ioredis?

@opentelemetry/instrumentation-ioredis is an npm package that provides automatic tracing and monitoring for applications using the ioredis library. It integrates with OpenTelemetry to collect and report metrics and traces for Redis operations, helping developers gain insights into the performance and behavior of their Redis interactions.

What are @opentelemetry/instrumentation-ioredis's main functionalities?

Automatic Tracing

This feature allows you to automatically trace Redis operations using the ioredis library. The code sample demonstrates how to set up the OpenTelemetry NodeTracerProvider and register the IORedisInstrumentation to start collecting traces for Redis commands.

const { NodeTracerProvider } = require('@opentelemetry/node');
const { registerInstrumentations } = require('@opentelemetry/instrumentation');
const { IORedisInstrumentation } = require('@opentelemetry/instrumentation-ioredis');

const provider = new NodeTracerProvider();
provider.register();

registerInstrumentations({
  instrumentations: [
    new IORedisInstrumentation(),
  ],
});

const Redis = require('ioredis');
const redis = new Redis();

redis.set('key', 'value');
redis.get('key', (err, result) => {
  console.log(result);
});

Custom Attributes

This feature allows you to add custom attributes to the spans created for Redis operations. The code sample shows how to use the responseHook option to add the Redis response as an attribute to the span.

const { IORedisInstrumentation } = require('@opentelemetry/instrumentation-ioredis');

const instrumentation = new IORedisInstrumentation({
  responseHook: (span, cmdName, args, response) => {
    span.setAttribute('redis.response', response);
  },
});

const { NodeTracerProvider } = require('@opentelemetry/node');
const { registerInstrumentations } = require('@opentelemetry/instrumentation');

const provider = new NodeTracerProvider();
provider.register();

registerInstrumentations({
  instrumentations: [instrumentation],
});

const Redis = require('ioredis');
const redis = new Redis();

redis.set('key', 'value');
redis.get('key', (err, result) => {
  console.log(result);
});

Other packages similar to @opentelemetry/instrumentation-ioredis

@opentelemetry/instrumentation-redis

@opentelemetry/instrumentation-redis provides similar functionality for the 'redis' library instead of 'ioredis'. It allows automatic tracing and monitoring of Redis operations using the 'redis' library, integrating with OpenTelemetry to collect and report metrics and traces.

README

OpenTelemetry ioredis Instrumentation for Node.js

This module provides automatic instrumentation for ioredis.

For automatic instrumentation see the @opentelemetry/sdk-trace-node package.

Compatible with OpenTelemetry JS API and SDK 1.0+.

Installation

npm install --save @opentelemetry/instrumentation-ioredis

Supported Versions

• >=2.0.0

Usage

To load a specific instrumentation (ioredis in this case), specify it in the registerInstrumentations's configuration

const { NodeTracerProvider } = require('@opentelemetry/sdk-trace-node');
const {
  IORedisInstrumentation,
} = require('@opentelemetry/instrumentation-ioredis');
const { registerInstrumentations } = require('@opentelemetry/instrumentation');

const provider = new NodeTracerProvider();
provider.register();

registerInstrumentations({
  instrumentations: [
    new IORedisInstrumentation({
      // see under for available configuration
    }),
  ],
});

IORedis Instrumentation Options

IORedis instrumentation has few options available to choose from. You can set the following:

Options	Type	Description
dbStatementSerializer	DbStatementSerializer	IORedis instrumentation will serialize db.statement using the specified function.
requestHook	RedisRequestCustomAttributeFunction (function)	Function for adding custom attributes on db request. Receives params: span, { moduleVersion, cmdName, cmdArgs }
responseHook	RedisResponseCustomAttributeFunction (function)	Function for adding custom attributes on db response
requireParentSpan	boolean	Require parent to create ioredis span, default when unset is true

Custom db.statement Serializer

The instrumentation serializes the whole command into a Span attribute called db.statement. The standard serialization format is {cmdName} {cmdArgs.join(',')}. It is also possible to define a custom serialization function. The function will receive the command name and arguments and must return a string.

Here is a simple example to serialize the command name skipping arguments:

const { IORedisInstrumentation } = require('@opentelemetry/instrumentation-ioredis');

const ioredisInstrumentation = new IORedisInstrumentation({
  dbStatementSerializer: function (cmdName, cmdArgs) {
    return cmdName;
  },
});

Using requestHook

Instrumentation user can configure a custom "hook" function which will be called on every request with the relevant span and request information. User can then set custom attributes on the span or run any instrumentation-extension logic per request.

Here is a simple example that adds a span attribute of ioredis instrumented version on each request:

const { IORedisInstrumentation } = require('@opentelemetry/instrumentation-ioredis');

const ioredisInstrumentation = new IORedisInstrumentation({
requestHook: function (
    span: Span,
    requestInfo: IORedisRequestHookInformation
  ) {
    if (requestInfo.moduleVersion) {
      span.setAttribute(
        'instrumented_library.version',
        requestInfo.moduleVersion
      );
    }
  }
});

Useful links

• For more information on OpenTelemetry, visit: https://opentelemetry.io/
• For more about OpenTelemetry JavaScript: https://github.com/open-telemetry/opentelemetry-js
• For help or feedback on this project, join us in GitHub Discussions

License

Apache 2.0 - See LICENSE for more information.