@opentelemetry/context-async-hooks
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This package provides async-hooks based context manager which is used internally by OpenTelemetry plugins to propagate specific context between function calls and async operations. It only targets NodeJS since async-hooks is only available there.
The definition and why they exist is available on the readme of the context-base package.
NodeJS has a specific API to track async context: async-hooks, it allows to track creation of new async operation and their respective parent. This package only handle storing a specific object for a given async hooks context.
Even if the API is native to NodeJS, it doesn't cover all possible cases of context propagation but there is a big effort from the NodeJS team to fix those. That's why we generally advise to be on the latest LTS to benefit from performance and bug fixes.
There are known modules that break context propagation (some of them are listed there), so it's possible that the context manager doesn't work with them.
Context propagation is a big subject when talking about tracing in NodeJS, if you want more information about that here are some resources:
Apache 2.0 - See LICENSE for more information.
0.8.2
opentelemetry-exporter-collector
opentelemetry-core
opentelemetry-api
global in browser environments (@legendecas)opentelemetry-core
The cls-hooked package provides a similar functionality to @opentelemetry/context-async-hooks by using the async_hooks module to create context-like namespaces that are preserved across asynchronous calls. It differs in its API and is not specifically tailored for OpenTelemetry or tracing but can be used for general context propagation purposes.
While not a separate npm package, Node.js' built-in async_hooks module is the underlying technology that both @opentelemetry/context-async-hooks and cls-hooked rely on for tracking asynchronous operations. It provides the primitives for creating hooks that monitor the lifecycle of asynchronous operations, which can be used directly for custom context propagation implementations.
FAQs
OpenTelemetry AsyncHooks-based Context Manager
The npm package @opentelemetry/context-async-hooks receives a total of 8,031,928 weekly downloads. As such, @opentelemetry/context-async-hooks popularity was classified as popular.
We found that @opentelemetry/context-async-hooks demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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