@opentelemetry/context-base

OpenTelemetry Base Context Manager

This package provides the ContextManager interface (which is used by concrete implementations) and a no-op implementation (which is used internally when no context propagation is defined). It's intended for use both on the server and in the browser.

What is a Context Manager ?

To understand why they exists, we'll need to understand how Javascript works: when you make native function call (networks, setInterval etc) you generally call C++ code that will later callback your own code.

A common issue when tracing a request in javascript is to link the function that have made the native call to the callback that the native code called when the response is there. Imagine you want to track for which user you made the request, you need some sort of "context/context aware storage".

ContextManager's aim to offer exactly that, it's API offer to store an object in the current context (with()) and if needed, bind() to a specific function call to find it back when the callback fire, which can later get retrieved using active().

This package only include the interface and a Noop implementation, for more information please see the async-hooks based ContextManager for NodeJS.

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 on gitter

License

Apache 2.0 - See LICENSE for more information.

Changelog

0.5.2

Released 2020-03-27

:rocket: (Enhancement)

• opentelemetry-exporter-prometheus, opentelemetry-metrics
  • #893 Metrics: Add lastUpdateTimestamp associated with point (@mayurkale22)
• opentelemetry-tracing
  • #896 Do not export empty span lists (@dyladan)
• opentelemetry-api, opentelemetry-tracing
  • #889 feat: start a root span with spanOptions.parent = null (@dyladan)

:bug: (Bug Fix)

• opentelemetry-core, opentelemetry-propagator-jaeger
  • #904 fix: add type checking in propagators (@dyladan)
• opentelemetry-context-base, opentelemetry-core, opentelemetry-plugin-document-load, opentelemetry-plugin-user-interaction, opentelemetry-web
  • #906 chore: fixing documentation for web tracer provider, fixing examples … (@obecny)
• Other
  • #884 chore: fixing main package.json version (@obecny)

:books: (Refine Doc)

• opentelemetry-context-base, opentelemetry-core, opentelemetry-plugin-document-load, opentelemetry-plugin-user-interaction, opentelemetry-web
  • #906 chore: fixing documentation for web tracer provider, fixing examples … (@obecny)

Committers: 4

• Bartlomiej Obecny (@obecny)
• Daniel Dyla (@dyladan)
• Mark Robert Henderson (@aphelionz)
• Mayur Kale (@mayurkale22)