starlette-context

Middleware for Starlette that allows you to store and access the context data of a request. Can be used with logging so logs automatically use request headers such as x-request-id or x-correlation-id.

Resources

• Source: https://github.com/tomwojcik/starlette-context
• Documentation: https://starlette-context.readthedocs.io/
• Changelog: https://starlette-context.readthedocs.io/en/latest/changelog.html

Installation

# Python 3.9+
pip install starlette-context

Dependencies

• starlette>=0.27.0

Example

import uvicorn

from starlette.applications import Starlette
from starlette.middleware import Middleware
from starlette.requests import Request
from starlette.responses import JSONResponse
from starlette.routing import Route

from starlette_context import context, plugins
from starlette_context.middleware import ContextMiddleware

async def index(request: Request):
    # Access and store data in context
    context["custom_value"] = "example"
    return JSONResponse(context.data)

# Define routes
routes = [
    Route("/", endpoint=index)
]

# Configure middleware
middleware = [
    Middleware(
        ContextMiddleware,
        plugins=(
            plugins.RequestIdPlugin(),
            plugins.CorrelationIdPlugin()
        )
    )
]

# Create application with routes and middleware
app = Starlette(
    routes=routes,
    middleware=middleware
)

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0")

In this example the response contains a JSON with:

{
  "X-Correlation-ID": "5ca2f0b43115461bad07ccae5976a990",
  "X-Request-ID": "21f8d52208ec44948d152dc49a713fdd",
  "custom_value": "example"
}

Context can be updated and accessed at anytime if it's created in the middleware.

Sponsorship

A huge thank you to Adverity for sponsoring the development of this OSS library.

Contribution

See the contributing guide.