[](https://pypi.org/project/asgi-correlation-id/)
[](https://github.com/snok/asgi-correlation-id/actions/workflows/test.yml)
[](https://codecov.io/gh/snok/asgi-correlation-id)
# ASGI Correlation ID middleware
Middleware for reading or generating correlation IDs for each incoming request. Correlation IDs can then be added to your
logs, making it simple to retrieve all logs generated from a single HTTP request.
When the middleware detects a correlation ID HTTP header in an incoming request, the ID is stored. If no header is
found, a correlation ID is generated for the request instead.
The middleware checks for the `X-Request-ID` header by default, but can be set to any key.
`X-Correlation-ID` is also pretty commonly used.
## Example
Once logging is configured, your output will go from this:
```
INFO ... project.views This is an info log
WARNING ... project.models This is a warning log
INFO ... project.views This is an info log
INFO ... project.views This is an info log
WARNING ... project.models This is a warning log
WARNING ... project.models This is a warning log
```
to this:
```docker
INFO ... [773fa6885] project.views This is an info log
WARNING ... [773fa6885] project.models This is a warning log
INFO ... [0d1c3919e] project.views This is an info log
INFO ... [99d44111e] project.views This is an info log
WARNING ... [0d1c3919e] project.models This is a warning log
WARNING ... [99d44111e] project.models This is a warning log
```
Now we're actually able to see which logs are related.
# Installation
```
pip install asgi-correlation-id
```
# Setup
To set up the package, you need to add the middleware and configure logging.
## Adding the middleware
The middleware can be added like this:
```python
from fastapi import FastAPI
from asgi_correlation_id import CorrelationIdMiddleware
app = FastAPI()
app.add_middleware(CorrelationIdMiddleware)
```
or any other way your framework allows.
For [Starlette](https://github.com/encode/starlette) apps, just substitute `FastAPI` with `Starlette` in all examples.
## Configure logging
This section assumes you have already started configuring logging in your project. If this is not the case, check out
the section on [setting up logging from scratch](#setting-up-logging-from-scratch) instead.
To set up logging of the correlation ID, you simply have to add the log-filter the package provides.
If your current log-config looked like this:
```python
LOGGING = {
'version': 1,
'disable_existing_loggers': False,
'formatters': {
'web': {
'class': 'logging.Formatter',
'datefmt': '%H:%M:%S',
'format': '%(levelname)s ... %(name)s %(message)s',
},
},
'handlers': {
'web': {
'class': 'logging.StreamHandler',
'formatter': 'web',
},
},
'loggers': {
'my_project': {
'handlers': ['web'],
'level': 'DEBUG',
'propagate': True,
},
},
}
```
You simply have to add the filter, like this:
```diff
LOGGING = {
'version': 1,
'disable_existing_loggers': False,
+ 'filters': {
+ 'correlation_id': {
+ '()': 'asgi_correlation_id.CorrelationIdFilter',
+ 'uuid_length': 32,
+ 'default_value': '-',
+ },
+ },
'formatters': {
'web': {
'class': 'logging.Formatter',
'datefmt': '%H:%M:%S',
+ 'format': '%(levelname)s ... [%(correlation_id)s] %(name)s %(message)s',
},
},
'handlers': {
'web': {
'class': 'logging.StreamHandler',
+ 'filters': ['correlation_id'],
'formatter': 'web',
},
},
'loggers': {
'my_project': {
'handlers': ['web'],
'level': 'DEBUG',
'propagate': True,
},
},
}
```
If you're using a json log-formatter, just add `correlation-id: %(correlation_id)s` to your list of properties.
## Middleware configuration
The middleware can be configured in a few ways, but there are no required arguments.
```python
app.add_middleware(
CorrelationIdMiddleware,
header_name='X-Request-ID',
update_request_header=True,
generator=lambda: uuid4().hex,
validator=is_valid_uuid4,
transformer=lambda a: a,
)
```
Configurable middleware arguments include:
**header_name**
- Type: `str`
- Default: `X-Request-ID`
- Description: The header name decides which HTTP header value to read correlation IDs from. `X-Request-ID` and
`X-Correlation-ID` are common choices.
**update_request_header**
- Type: `bool`
- Default: `True`
- Description: Whether to update incoming request's header value with the generated correlation ID. This is to support
use cases where it's relied on the presence of the request header (like various tracing middlewares).
**generator**
- Type: `Callable[[], str]`
- Default: `lambda: uuid4().hex`
- Description: The generator function is responsible for generating new correlation IDs when no ID is received from an
incoming request's headers. We use UUIDs by default, but if you prefer, you could use libraries
like [nanoid](https://github.com/puyuan/py-nanoid) or your own custom function.
**validator**
- Type: `Callable[[str], bool]`
- Default: `is_valid_uuid4` (
found [here](https://github.com/snok/asgi-correlation-id/blob/main/asgi_correlation_id/middleware.py#L17))
- Description: The validator function is used when reading incoming HTTP header values. By default, we discard non-UUID
formatted header values, to enforce correlation ID uniqueness. If you prefer to allow any header value, you can set
this setting to `None`, or pass your own validator.
**transformer**
- Type: `Callable[[str], str]`
- Default: `lambda a: a`
- Description: Most users won't need a transformer, and by default we do nothing.
The argument was added for cases where users might want to alter incoming or generated ID values in some way. It
provides a mechanism for transforming an incoming ID in a way you see fit. See the middleware code for more context.
## CORS
If you are using cross-origin resource sharing ([CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS)), e.g.
you are making requests to an API from a frontend JavaScript code served from a different origin, you have to ensure
two things:
- permit correlation ID header in the incoming requests' HTTP headers so the value can be reused by the middleware,
- add the correlation ID header to the allowlist in responses' HTTP headers so it can be accessed by the browser.
This can be best accomplished by using a dedicated middleware for your framework of choice. Here are some examples.
### Starlette
Docs: https://www.starlette.io/middleware/#corsmiddleware
```python
from starlette.applications import Starlette
from starlette.middleware import Middleware
from starlette.middleware.cors import CORSMiddleware
middleware = [
Middleware(
CORSMiddleware,
allow_origins=['*'],
allow_methods=['*'],
allow_headers=['X-Requested-With', 'X-Request-ID'],
expose_headers=['X-Request-ID']
)
]
app = Starlette(..., middleware=middleware)
```
### FastAPI
Docs: https://fastapi.tiangolo.com/tutorial/cors/
```python
from app.main import app
from fastapi.middleware.cors import CORSMiddleware
app.add_middleware(
CORSMiddleware,
allow_origins=['*'],
allow_methods=['*'],
allow_headers=['X-Requested-With', 'X-Request-ID'],
expose_headers=['X-Request-ID']
)
```
For more details on the topic, refer to the [CORS protocol](https://fetch.spec.whatwg.org/#http-cors-protocol).
## Exception handling
By default, the `X-Request-ID` response header will be included in all responses from the server, *except* in the case
of unhandled server errors. If you wish to include request IDs in the case of a `500` error you can add a custom
exception handler.
Here are some simple examples to help you get started. See each framework's documentation for more info.
### Starlette
Docs: https://www.starlette.io/exceptions/
```python
from starlette.requests import Request
from starlette.responses import PlainTextResponse
from starlette.applications import Starlette
from asgi_correlation_id import correlation_id
async def custom_exception_handler(request: Request, exc: Exception) -> PlainTextResponse:
return PlainTextResponse(
"Internal Server Error",
status_code=500,
headers={'X-Request-ID': correlation_id.get() or ""}
)
app = Starlette(
...,
exception_handlers={500: custom_exception_handler}
)
```
### FastAPI
Docs: https://fastapi.tiangolo.com/tutorial/handling-errors/
```python
from app.main import app
from fastapi import HTTPException, Request
from fastapi.exception_handlers import http_exception_handler
from fastapi.responses import JSONResponse
from asgi_correlation_id import correlation_id
@app.exception_handler(Exception)
async def unhandled_exception_handler(request: Request, exc: Exception) -> JSONResponse:
return await http_exception_handler(
request,
HTTPException(
500,
'Internal server error',
headers={'X-Request-ID': correlation_id.get() or ""}
))
```
If you are using CORS, you also have to include the `Access-Control-Allow-Origin` and `Access-Control-Expose-Headers`
headers in the error response. For more details, see the [CORS section](#cors) above.
# Setting up logging from scratch
If your project does not have logging configured, this section will explain how to get started. If you want even more
details, take a look
at [this blogpost](https://medium.com/@sondrelg_12432/setting-up-request-id-logging-for-your-fastapi-application-4dc190aac0ea)
.
The Python [docs](https://docs.python.org/3/library/logging.config.html) explain there are a few configuration functions
you may use for simpler setup. For this example we will use `dictConfig`, because that's what, e.g., Django users should
find most familiar, but the different configuration methods are interchangable, so if you want to use another method,
just browse the python docs and change the configuration method as you please.
The benefit of `dictConfig` is that it lets you specify your entire logging configuration in a single data structure,
and it lets you add conditional logic to it. The following example shows how to set up both console and JSON logging:
```python
from logging.config import dictConfig
from app.core.config import settings
def configure_logging() -> None:
dictConfig(
{
'version': 1,
'disable_existing_loggers': False,
'filters': { # correlation ID filter must be added here to make the %(correlation_id)s formatter work
'correlation_id': {
'()': 'asgi_correlation_id.CorrelationIdFilter',
'uuid_length': 8 if not settings.ENVIRONMENT == 'local' else 32,
'default_value': '-',
},
},
'formatters': {
'console': {
'class': 'logging.Formatter',
'datefmt': '%H:%M:%S',
# formatter decides how our console logs look, and what info is included.
# adding %(correlation_id)s to this format is what make correlation IDs appear in our logs
'format': '%(levelname)s:\t\b%(asctime)s %(name)s:%(lineno)d [%(correlation_id)s] %(message)s',
},
},
'handlers': {
'console': {
'class': 'logging.StreamHandler',
# Filter must be declared in the handler, otherwise it won't be included
'filters': ['correlation_id'],
'formatter': 'console',
},
},
# Loggers can be specified to set the log-level to log, and which handlers to use
'loggers': {
# project logger
'app': {'handlers': ['console'], 'level': 'DEBUG', 'propagate': True},
# third-party package loggers
'databases': {'handlers': ['console'], 'level': 'WARNING'},
'httpx': {'handlers': ['console'], 'level': 'INFO'},
'asgi_correlation_id': {'handlers': ['console'], 'level': 'WARNING'},
},
}
)
```
With the logging configuration defined within a function like this, all you have to do is make sure to run the function
on startup somehow, and logging should work for you. You can do this any way you'd like, but passing it to
the `FastAPI.on_startup` list of callables is a good starting point.
# Integration with structlog
[structlog](https://www.structlog.org/) is a Python library that enables structured logging.
It is trivial to configure with `asgi_correlation_id`:
```python
import logging
from typing import Any
import structlog
from asgi_correlation_id import correlation_id
def add_correlation(
logger: logging.Logger, method_name: str, event_dict: dict[str, Any]
) -> dict[str, Any]:
"""Add request id to log message."""
if request_id := correlation_id.get():
event_dict["request_id"] = request_id
return event_dict
structlog.configure(
processors=[
add_correlation,
structlog.stdlib.filter_by_level,
structlog.stdlib.add_logger_name,
structlog.stdlib.add_log_level,
structlog.processors.TimeStamper(fmt="%Y-%m-%d %H:%M.%S"),
structlog.processors.StackInfoRenderer(),
structlog.processors.format_exc_info,
structlog.processors.JSONRenderer(),
],
wrapper_class=structlog.stdlib.BoundLogger,
logger_factory=structlog.stdlib.LoggerFactory(),
cache_logger_on_first_use=True,
)
```
# Integration with [SAQ](https://github.com/tobymao/saq)
If you're using [saq](https://github.com/tobymao/saq/), you
can easily transfer request IDs from the web server to your
workers by using the event hooks provided by the library:
```python
from uuid import uuid4
from asgi_correlation_id import correlation_id
from saq import Job, Queue
CID_TRANSFER_KEY = 'correlation_id'
async def before_enqueue(job: Job) -> None:
"""
Transfer the correlation ID from the current context to the worker.
This might be called from a web server or a worker process.
"""
job.meta[CID_TRANSFER_KEY] = correlation_id.get() or uuid4()
async def before_process(ctx: dict) -> None:
"""
Load correlation ID from the enqueueing process to this one.
"""
correlation_id.set(ctx['job'].meta.get(CID_TRANSFER_KEY, uuid4()))
async def after_process(ctx: dict) -> None:
"""
Reset correlation ID for this process.
"""
correlation_id.set(None)
queue = Queue(...)
queue.register_before_enqueue(before_enqueue)
priority_settings = {
...,
'queue': queue,
'before_process': before_process,
'after_process': after_process,
}
```
# Integration with [hypercorn](https://github.com/pgjones/hypercorn)
To add a correlation ID to your [hypercorn](https://github.com/pgjones/hypercorn) logs, you'll need to add a log filter and change the log formatting. Here's an example of how to configure hypercorn, if you're running a [FastAPI](https://fastapi.tiangolo.com/deployment/manually/) app:
```python
import logging
import os
from fastapi import APIRouter, FastAPI
from hypercorn.config import Config
from hypercorn.asyncio import serve
import asgi_correlation_id
import asyncio
import hypercorn
def configure_logging():
console_handler = logging.StreamHandler()
console_handler.addFilter(asgi_correlation_id.CorrelationIdFilter())
logging.basicConfig(
handlers=[console_handler],
level="INFO",
format="%(levelname)s log [%(correlation_id)s] %(name)s %(message)s")
app = FastAPI(on_startup=[configure_logging])
app.add_middleware(asgi_correlation_id.CorrelationIdMiddleware)
router = APIRouter()
@router.get("/test")
async def test_get():
print("toto")
logger = logging.getLogger()
logger.info("test_get")
app.include_router(router)
if __name__ == "__main__":
logConfig = {
"handlers": {
"hypercorn.access": {
"formatter": "hypercorn.access",
"level": "INFO",
"class": "logging.StreamHandler",
"stream": "ext://sys.stdout",
"filters": [
asgi_correlation_id.CorrelationIdFilter()
],
}},
"formatters": {
"hypercorn.access": {
"format": "%(message)s %(correlation_id)s",
}
},
"loggers": {
"hypercorn.access": {
"handlers": [
"hypercorn.access"
],
"level": "INFO",
},
},
"version": 1
}
config = Config()
# write access log to stdout
config.accesslog = "-"
config.logconfig_dict = logConfig
asyncio.run(serve(app, config))
```
```
# run it
$ python3 test.py
# test it:
$ curl http://localhost:8080/test
# log on stdout:
INFO log [7e7ccfff352a428991920d1da2502674] root test_get
127.0.0.1:34754 - - [14/Dec/2023:10:34:08 +0100] "GET /test 1.1" 200 4 "-" "curl/7.76.1" 7e7ccfff352a428991920d1da2502674
```
# Integration with [Uvicorn](https://github.com/encode/uvicorn)
To add a correlation ID to your [uvicorn](https://github.com/encode/uvicorn) logs, you'll need to add a log filter and change the log formatting. Here's an example of how to configure uvicorn, if you're running a [FastAPI](https://fastapi.tiangolo.com/deployment/manually/) app:
```python
import logging
import os
import asgi_correlation_id
import uvicorn
from fastapi import APIRouter, FastAPI
from uvicorn.config import LOGGING_CONFIG
def configure_logging():
console_handler = logging.StreamHandler()
console_handler.addFilter(asgi_correlation_id.CorrelationIdFilter())
logging.basicConfig(
handlers=[console_handler],
level="INFO",
format="%(levelname)s log [%(correlation_id)s] %(name)s %(message)s")
app = FastAPI(on_startup=[configure_logging])
app.add_middleware(asgi_correlation_id.CorrelationIdMiddleware)
router = APIRouter()
@router.get("/test")
async def test_get():
logger = logging.getLogger()
logger.info("test_get")
app.include_router(router)
if __name__ == "__main__":
LOGGING_CONFIG["handlers"]["access"]["filters"] = [asgi_correlation_id.CorrelationIdFilter()]
LOGGING_CONFIG["formatters"]["access"]["fmt"] = "%(levelname)s access [%(correlation_id)s] %(name)s %(message)s"
uvicorn.run("test:app", port=8080, log_level=os.environ.get("LOGLEVEL", "DEBUG").lower())
```
```
# run it
python test.py
# test it
curl http://localhost:8080/test
# log on stdout
INFO log [16b61d57f9ff4a85ac80f5cd406e0aa2] root test_get
INFO access [16b61d57f9ff4a85ac80f5cd406e0aa2] uvicorn.access 127.0.0.1:24810 - "GET /test HTTP/1.1" 200
```
# Extensions
In addition to the middleware, we've added a couple of extensions for third-party packages.
## Sentry
If your project has [sentry-sdk](https://pypi.org/project/sentry-sdk/)
installed, correlation IDs will automatically be added to Sentry events as a `transaction_id`.
See
this [blogpost](https://blog.sentry.io/2019/04/04/trace-errors-through-stack-using-unique-identifiers-in-sentry#1-generate-a-unique-identifier-and-set-as-a-sentry-tag-on-issuing-service)
for a little bit of detail. The transaction ID is displayed in the event detail view in Sentry and is just an easy way
to connect logs to a Sentry event.
## Celery
> Note: If you're using the celery integration, install the package with `pip install asgi-correlation-id[celery]`
For Celery user's there's one primary issue: workers run as completely separate processes, so correlation IDs are lost
when spawning background tasks from requests.
However, with some Celery signal magic, we can actually transfer correlation IDs to worker processes, like this:
```python
@before_task_publish.connect()
def transfer_correlation_id(headers) -> None:
# This is called before task.delay() finishes
# Here we're able to transfer the correlation ID via the headers kept in our backend
headers[header_key] = correlation_id.get()
@task_prerun.connect()
def load_correlation_id(task) -> None:
# This is called when the worker picks up the task
# Here we're able to load the correlation ID from the headers
id_value = task.request.get(header_key)
correlation_id.set(id_value)
```
To configure correlation ID transfer, simply import and run the setup function the package provides:
```python
from asgi_correlation_id.extensions.celery import load_correlation_ids
load_correlation_ids()
```
### Taking it one step further - Adding Celery tracing IDs
In addition to transferring request IDs to Celery workers, we've added one more log filter for improving tracing in
celery processes. This is completely separate from correlation ID functionality, but is something we use ourselves, so
keep in the package with the rest of the signals.
The log filter adds an ID, `celery_current_id` for each worker process, and an ID, `celery_parent_id` for the process
that spawned it.
Here's a quick summary of outputs from different scenarios:
| Scenario | Correlation ID | Celery Current ID | Celery Parent ID |
|------------------------------------------ |--------------------|-------------------|------------------|
| Request | ✅ | | |
| Request -> Worker | ✅ | ✅ | |
| Request -> Worker -> Another worker | ✅ | ✅ | ✅ |
| Beat -> Worker | ✅* | ✅ | | |
| Beat -> Worker -> Worker | ✅* | ✅ | ✅ | ✅ |
*When we're in a process spawned separately from an HTTP request, a correlation ID is still spawned for the first
process in the chain, and passed down. You can think of the correlation ID as an origin ID, while the combination of
current and parent-ids as a way of linking the chain.
To add the current and parent IDs, just alter your `celery.py` to this:
```diff
+ from asgi_correlation_id.extensions.celery import load_correlation_ids, load_celery_current_and_parent_ids
load_correlation_ids()
+ load_celery_current_and_parent_ids()
```
If you wish to correlate celery task IDs through the IDs found in your broker (i.e., the celery `task_id`), use the `use_internal_celery_task_id` argument on `load_celery_current_and_parent_ids`
```diff
from asgi_correlation_id.extensions.celery import load_correlation_ids, load_celery_current_and_parent_ids
load_correlation_ids()
+ load_celery_current_and_parent_ids(use_internal_celery_task_id=True)
```
Note: `load_celery_current_and_parent_ids` will ignore the `generator` argument when `use_internal_celery_task_id` is set to `True`
To set up the additional log filters, update your log config like this:
```diff
LOGGING = {
'version': 1,
'disable_existing_loggers': False,
'filters': {
'correlation_id': {
+ '()': 'asgi_correlation_id.CorrelationIdFilter',
+ 'uuid_length': 32,
+ 'default_value': '-',
+ },
+ 'celery_tracing': {
+ '()': 'asgi_correlation_id.CeleryTracingIdsFilter',
+ 'uuid_length': 32,
+ 'default_value': '-',
+ },
},
'formatters': {
'web': {
'class': 'logging.Formatter',
'datefmt': '%H:%M:%S',
'format': '%(levelname)s ... [%(correlation_id)s] %(name)s %(message)s',
},
+ 'celery': {
+ 'class': 'logging.Formatter',
+ 'datefmt': '%H:%M:%S',
+ 'format': '%(levelname)s ... [%(correlation_id)s] [%(celery_parent_id)s-%(celery_current_id)s] %(name)s %(message)s',
+ },
},
'handlers': {
'web': {
'class': 'logging.StreamHandler',
'filters': ['correlation_id'],
'formatter': 'web',
},
+ 'celery': {
+ 'class': 'logging.StreamHandler',
+ 'filters': ['correlation_id', 'celery_tracing'],
+ 'formatter': 'celery',
+ },
},
'loggers': {
'my_project': {
+ 'handlers': ['celery' if any('celery' in i for i in sys.argv) else 'web'],
'level': 'DEBUG',
'propagate': True,
},
},
}
```
With these IDs configured you should be able to:
1. correlate all logs from a single origin, and
2. piece together the order each log was run, and which process spawned which
#### Example
With everything configured, assuming you have a set of tasks like this:
```python
@celery.task()
def debug_task() -> None:
logger.info('Debug task 1')
second_debug_task.delay()
second_debug_task.delay()
@celery.task()
def second_debug_task() -> None:
logger.info('Debug task 2')
third_debug_task.delay()
fourth_debug_task.delay()
@celery.task()
def third_debug_task() -> None:
logger.info('Debug task 3')
fourth_debug_task.delay()
fourth_debug_task.delay()
@celery.task()
def fourth_debug_task() -> None:
logger.info('Debug task 4')
```
your logs could look something like this:
```
correlation-id current-id
| parent-id |
| | |
INFO [3b162382e1] [ - ] [93ddf3639c] project.tasks - Debug task 1
INFO [3b162382e1] [93ddf3639c] [24046ab022] project.tasks - Debug task 2
INFO [3b162382e1] [93ddf3639c] [cb5595a417] project.tasks - Debug task 2
INFO [3b162382e1] [24046ab022] [08f5428a66] project.tasks - Debug task 3
INFO [3b162382e1] [24046ab022] [32f40041c6] project.tasks - Debug task 4
INFO [3b162382e1] [cb5595a417] [1c75a4ed2c] project.tasks - Debug task 3
INFO [3b162382e1] [08f5428a66] [578ad2d141] project.tasks - Debug task 4
INFO [3b162382e1] [cb5595a417] [21b2ef77ae] project.tasks - Debug task 4
INFO [3b162382e1] [08f5428a66] [8cad7fc4d7] project.tasks - Debug task 4
INFO [3b162382e1] [1c75a4ed2c] [72a43319f0] project.tasks - Debug task 4
INFO [3b162382e1] [1c75a4ed2c] [ec3cf4113e] project.tasks - Debug task 4
```
Raw data
{
"_id": null,
"home_page": "https://github.com/snok/asgi-correlation-id",
"name": "asgi-correlation-id",
"maintainer": "Jonas Kr\u00fcger Svensson",
"docs_url": null,
"requires_python": "<4.0,>=3.8",
"maintainer_email": "jonas-ks@hotmail.com",
"keywords": "asgi, fastapi, starlette, async, correlation, correlation-id, request-id, x-request-id, tracing, logging, middleware, sentry, celery",
"author": "Sondre Lilleb\u00f8 Gundersen",
"author_email": "sondrelg@live.no",
"download_url": "https://files.pythonhosted.org/packages/f4/ff/a6538245ac1eaa7733ec6740774e9d5add019e2c63caa29e758c16c0afdd/asgi_correlation_id-4.3.4.tar.gz",
"platform": null,
"description": "[](https://pypi.org/project/asgi-correlation-id/)\n[](https://github.com/snok/asgi-correlation-id/actions/workflows/test.yml)\n[](https://codecov.io/gh/snok/asgi-correlation-id)\n\n# ASGI Correlation ID middleware\n\nMiddleware for reading or generating correlation IDs for each incoming request. Correlation IDs can then be added to your\nlogs, making it simple to retrieve all logs generated from a single HTTP request.\n\nWhen the middleware detects a correlation ID HTTP header in an incoming request, the ID is stored. If no header is\nfound, a correlation ID is generated for the request instead.\n\nThe middleware checks for the `X-Request-ID` header by default, but can be set to any key.\n`X-Correlation-ID` is also pretty commonly used.\n\n## Example\n\nOnce logging is configured, your output will go from this:\n\n```\nINFO ... project.views This is an info log\nWARNING ... project.models This is a warning log\nINFO ... project.views This is an info log\nINFO ... project.views This is an info log\nWARNING ... project.models This is a warning log\nWARNING ... project.models This is a warning log\n```\n\nto this:\n\n```docker\nINFO ... [773fa6885] project.views This is an info log\nWARNING ... [773fa6885] project.models This is a warning log\nINFO ... [0d1c3919e] project.views This is an info log\nINFO ... [99d44111e] project.views This is an info log\nWARNING ... [0d1c3919e] project.models This is a warning log\nWARNING ... [99d44111e] project.models This is a warning log\n```\n\nNow we're actually able to see which logs are related.\n\n# Installation\n\n```\npip install asgi-correlation-id\n```\n\n# Setup\n\nTo set up the package, you need to add the middleware and configure logging.\n\n## Adding the middleware\n\nThe middleware can be added like this:\n\n```python\nfrom fastapi import FastAPI\n\nfrom asgi_correlation_id import CorrelationIdMiddleware\n\napp = FastAPI()\napp.add_middleware(CorrelationIdMiddleware)\n```\n\nor any other way your framework allows.\n\nFor [Starlette](https://github.com/encode/starlette) apps, just substitute `FastAPI` with `Starlette` in all examples.\n\n## Configure logging\n\nThis section assumes you have already started configuring logging in your project. If this is not the case, check out\nthe section on [setting up logging from scratch](#setting-up-logging-from-scratch) instead.\n\nTo set up logging of the correlation ID, you simply have to add the log-filter the package provides.\n\nIf your current log-config looked like this:\n\n```python\nLOGGING = {\n 'version': 1,\n 'disable_existing_loggers': False,\n 'formatters': {\n 'web': {\n 'class': 'logging.Formatter',\n 'datefmt': '%H:%M:%S',\n 'format': '%(levelname)s ... %(name)s %(message)s',\n },\n },\n 'handlers': {\n 'web': {\n 'class': 'logging.StreamHandler',\n 'formatter': 'web',\n },\n },\n 'loggers': {\n 'my_project': {\n 'handlers': ['web'],\n 'level': 'DEBUG',\n 'propagate': True,\n },\n },\n}\n```\n\nYou simply have to add the filter, like this:\n\n```diff\nLOGGING = {\n 'version': 1,\n 'disable_existing_loggers': False,\n+ 'filters': {\n+ 'correlation_id': {\n+ '()': 'asgi_correlation_id.CorrelationIdFilter',\n+ 'uuid_length': 32,\n+ 'default_value': '-',\n+ },\n+ },\n 'formatters': {\n 'web': {\n 'class': 'logging.Formatter',\n 'datefmt': '%H:%M:%S',\n+ 'format': '%(levelname)s ... [%(correlation_id)s] %(name)s %(message)s',\n },\n },\n 'handlers': {\n 'web': {\n 'class': 'logging.StreamHandler',\n+ 'filters': ['correlation_id'],\n 'formatter': 'web',\n },\n },\n 'loggers': {\n 'my_project': {\n 'handlers': ['web'],\n 'level': 'DEBUG',\n 'propagate': True,\n },\n },\n}\n```\n\nIf you're using a json log-formatter, just add `correlation-id: %(correlation_id)s` to your list of properties.\n\n## Middleware configuration\n\nThe middleware can be configured in a few ways, but there are no required arguments.\n\n```python\napp.add_middleware(\n CorrelationIdMiddleware,\n header_name='X-Request-ID',\n update_request_header=True,\n generator=lambda: uuid4().hex,\n validator=is_valid_uuid4,\n transformer=lambda a: a,\n)\n```\n\nConfigurable middleware arguments include:\n\n**header_name**\n\n- Type: `str`\n- Default: `X-Request-ID`\n- Description: The header name decides which HTTP header value to read correlation IDs from. `X-Request-ID` and\n `X-Correlation-ID` are common choices.\n\n**update_request_header**\n\n- Type: `bool`\n- Default: `True`\n- Description: Whether to update incoming request's header value with the generated correlation ID. This is to support\n use cases where it's relied on the presence of the request header (like various tracing middlewares).\n\n**generator**\n\n- Type: `Callable[[], str]`\n- Default: `lambda: uuid4().hex`\n- Description: The generator function is responsible for generating new correlation IDs when no ID is received from an\n incoming request's headers. We use UUIDs by default, but if you prefer, you could use libraries\n like [nanoid](https://github.com/puyuan/py-nanoid) or your own custom function.\n\n**validator**\n\n- Type: `Callable[[str], bool]`\n- Default: `is_valid_uuid4` (\n found [here](https://github.com/snok/asgi-correlation-id/blob/main/asgi_correlation_id/middleware.py#L17))\n- Description: The validator function is used when reading incoming HTTP header values. By default, we discard non-UUID\n formatted header values, to enforce correlation ID uniqueness. If you prefer to allow any header value, you can set\n this setting to `None`, or pass your own validator.\n\n**transformer**\n\n- Type: `Callable[[str], str]`\n- Default: `lambda a: a`\n- Description: Most users won't need a transformer, and by default we do nothing.\n The argument was added for cases where users might want to alter incoming or generated ID values in some way. It\n provides a mechanism for transforming an incoming ID in a way you see fit. See the middleware code for more context.\n\n## CORS\n\nIf you are using cross-origin resource sharing ([CORS](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS)), e.g.\nyou are making requests to an API from a frontend JavaScript code served from a different origin, you have to ensure\ntwo things:\n\n- permit correlation ID header in the incoming requests' HTTP headers so the value can be reused by the middleware,\n- add the correlation ID header to the allowlist in responses' HTTP headers so it can be accessed by the browser.\n\nThis can be best accomplished by using a dedicated middleware for your framework of choice. Here are some examples.\n\n### Starlette\n\nDocs: https://www.starlette.io/middleware/#corsmiddleware\n\n```python\nfrom starlette.applications import Starlette\nfrom starlette.middleware import Middleware\nfrom starlette.middleware.cors import CORSMiddleware\n\n\nmiddleware = [\n Middleware(\n CORSMiddleware,\n allow_origins=['*'],\n allow_methods=['*'],\n allow_headers=['X-Requested-With', 'X-Request-ID'],\n expose_headers=['X-Request-ID']\n )\n]\n\napp = Starlette(..., middleware=middleware)\n```\n\n### FastAPI\n\nDocs: https://fastapi.tiangolo.com/tutorial/cors/\n\n```python\nfrom app.main import app\nfrom fastapi.middleware.cors import CORSMiddleware\n\n\napp.add_middleware(\n CORSMiddleware,\n allow_origins=['*'],\n allow_methods=['*'],\n allow_headers=['X-Requested-With', 'X-Request-ID'],\n expose_headers=['X-Request-ID']\n)\n```\n\nFor more details on the topic, refer to the [CORS protocol](https://fetch.spec.whatwg.org/#http-cors-protocol).\n\n## Exception handling\n\nBy default, the `X-Request-ID` response header will be included in all responses from the server, *except* in the case\nof unhandled server errors. If you wish to include request IDs in the case of a `500` error you can add a custom\nexception handler.\n\nHere are some simple examples to help you get started. See each framework's documentation for more info.\n\n### Starlette\n\nDocs: https://www.starlette.io/exceptions/\n\n```python\nfrom starlette.requests import Request\nfrom starlette.responses import PlainTextResponse\nfrom starlette.applications import Starlette\n\nfrom asgi_correlation_id import correlation_id\n\n\nasync def custom_exception_handler(request: Request, exc: Exception) -> PlainTextResponse:\n return PlainTextResponse(\n \"Internal Server Error\",\n status_code=500,\n headers={'X-Request-ID': correlation_id.get() or \"\"}\n )\n\n\napp = Starlette(\n ...,\n exception_handlers={500: custom_exception_handler}\n)\n```\n\n### FastAPI\n\nDocs: https://fastapi.tiangolo.com/tutorial/handling-errors/\n\n```python\nfrom app.main import app\nfrom fastapi import HTTPException, Request\nfrom fastapi.exception_handlers import http_exception_handler\nfrom fastapi.responses import JSONResponse\n\nfrom asgi_correlation_id import correlation_id\n\n\n@app.exception_handler(Exception)\nasync def unhandled_exception_handler(request: Request, exc: Exception) -> JSONResponse:\n return await http_exception_handler(\n request,\n HTTPException(\n 500,\n 'Internal server error',\n headers={'X-Request-ID': correlation_id.get() or \"\"}\n ))\n```\n\nIf you are using CORS, you also have to include the `Access-Control-Allow-Origin` and `Access-Control-Expose-Headers`\nheaders in the error response. For more details, see the [CORS section](#cors) above.\n\n# Setting up logging from scratch\n\nIf your project does not have logging configured, this section will explain how to get started. If you want even more\ndetails, take a look\nat [this blogpost](https://medium.com/@sondrelg_12432/setting-up-request-id-logging-for-your-fastapi-application-4dc190aac0ea)\n.\n\nThe Python [docs](https://docs.python.org/3/library/logging.config.html) explain there are a few configuration functions\nyou may use for simpler setup. For this example we will use `dictConfig`, because that's what, e.g., Django users should\nfind most familiar, but the different configuration methods are interchangable, so if you want to use another method,\njust browse the python docs and change the configuration method as you please.\n\nThe benefit of `dictConfig` is that it lets you specify your entire logging configuration in a single data structure,\nand it lets you add conditional logic to it. The following example shows how to set up both console and JSON logging:\n\n```python\nfrom logging.config import dictConfig\n\nfrom app.core.config import settings\n\n\ndef configure_logging() -> None:\n dictConfig(\n {\n 'version': 1,\n 'disable_existing_loggers': False,\n 'filters': { # correlation ID filter must be added here to make the %(correlation_id)s formatter work\n 'correlation_id': {\n '()': 'asgi_correlation_id.CorrelationIdFilter',\n 'uuid_length': 8 if not settings.ENVIRONMENT == 'local' else 32,\n 'default_value': '-',\n },\n },\n 'formatters': {\n 'console': {\n 'class': 'logging.Formatter',\n 'datefmt': '%H:%M:%S',\n # formatter decides how our console logs look, and what info is included.\n # adding %(correlation_id)s to this format is what make correlation IDs appear in our logs\n 'format': '%(levelname)s:\\t\\b%(asctime)s %(name)s:%(lineno)d [%(correlation_id)s] %(message)s',\n },\n },\n 'handlers': {\n 'console': {\n 'class': 'logging.StreamHandler',\n # Filter must be declared in the handler, otherwise it won't be included\n 'filters': ['correlation_id'],\n 'formatter': 'console',\n },\n },\n # Loggers can be specified to set the log-level to log, and which handlers to use\n 'loggers': {\n # project logger\n 'app': {'handlers': ['console'], 'level': 'DEBUG', 'propagate': True},\n # third-party package loggers\n 'databases': {'handlers': ['console'], 'level': 'WARNING'},\n 'httpx': {'handlers': ['console'], 'level': 'INFO'},\n 'asgi_correlation_id': {'handlers': ['console'], 'level': 'WARNING'},\n },\n }\n )\n```\n\nWith the logging configuration defined within a function like this, all you have to do is make sure to run the function\non startup somehow, and logging should work for you. You can do this any way you'd like, but passing it to\nthe `FastAPI.on_startup` list of callables is a good starting point.\n\n# Integration with structlog\n\n[structlog](https://www.structlog.org/) is a Python library that enables structured logging.\n\nIt is trivial to configure with `asgi_correlation_id`:\n\n```python\nimport logging\nfrom typing import Any\n\nimport structlog\nfrom asgi_correlation_id import correlation_id\n\n\ndef add_correlation(\n logger: logging.Logger, method_name: str, event_dict: dict[str, Any]\n) -> dict[str, Any]:\n \"\"\"Add request id to log message.\"\"\"\n if request_id := correlation_id.get():\n event_dict[\"request_id\"] = request_id\n return event_dict\n\n\nstructlog.configure(\n processors=[\n add_correlation,\n structlog.stdlib.filter_by_level,\n structlog.stdlib.add_logger_name,\n structlog.stdlib.add_log_level,\n structlog.processors.TimeStamper(fmt=\"%Y-%m-%d %H:%M.%S\"),\n structlog.processors.StackInfoRenderer(),\n structlog.processors.format_exc_info,\n structlog.processors.JSONRenderer(),\n ],\n wrapper_class=structlog.stdlib.BoundLogger,\n logger_factory=structlog.stdlib.LoggerFactory(),\n cache_logger_on_first_use=True,\n)\n```\n\n# Integration with [SAQ](https://github.com/tobymao/saq)\n\nIf you're using [saq](https://github.com/tobymao/saq/), you\ncan easily transfer request IDs from the web server to your\nworkers by using the event hooks provided by the library:\n\n```python\nfrom uuid import uuid4\n\nfrom asgi_correlation_id import correlation_id\nfrom saq import Job, Queue\n\n\nCID_TRANSFER_KEY = 'correlation_id'\n\n\nasync def before_enqueue(job: Job) -> None:\n \"\"\"\n Transfer the correlation ID from the current context to the worker.\n\n This might be called from a web server or a worker process.\n \"\"\"\n job.meta[CID_TRANSFER_KEY] = correlation_id.get() or uuid4()\n\n\nasync def before_process(ctx: dict) -> None:\n \"\"\"\n Load correlation ID from the enqueueing process to this one.\n \"\"\"\n correlation_id.set(ctx['job'].meta.get(CID_TRANSFER_KEY, uuid4()))\n\n\nasync def after_process(ctx: dict) -> None:\n \"\"\"\n Reset correlation ID for this process.\n \"\"\"\n correlation_id.set(None)\n\nqueue = Queue(...)\nqueue.register_before_enqueue(before_enqueue)\n\npriority_settings = {\n ...,\n 'queue': queue,\n 'before_process': before_process,\n 'after_process': after_process,\n}\n```\n\n# Integration with [hypercorn](https://github.com/pgjones/hypercorn)\nTo add a correlation ID to your [hypercorn](https://github.com/pgjones/hypercorn) logs, you'll need to add a log filter and change the log formatting. Here's an example of how to configure hypercorn, if you're running a [FastAPI](https://fastapi.tiangolo.com/deployment/manually/) app:\n\n```python\nimport logging\nimport os\n\nfrom fastapi import APIRouter, FastAPI\nfrom hypercorn.config import Config\nfrom hypercorn.asyncio import serve\nimport asgi_correlation_id\nimport asyncio\nimport hypercorn\n\n\ndef configure_logging():\n console_handler = logging.StreamHandler()\n console_handler.addFilter(asgi_correlation_id.CorrelationIdFilter())\n logging.basicConfig(\n handlers=[console_handler],\n level=\"INFO\",\n\tformat=\"%(levelname)s log [%(correlation_id)s] %(name)s %(message)s\")\n\n\napp = FastAPI(on_startup=[configure_logging])\napp.add_middleware(asgi_correlation_id.CorrelationIdMiddleware)\nrouter = APIRouter()\n\n\n@router.get(\"/test\")\nasync def test_get():\n print(\"toto\")\n logger = logging.getLogger()\n logger.info(\"test_get\")\n\n\napp.include_router(router)\n\n\nif __name__ == \"__main__\":\n logConfig = {\n \"handlers\": {\n \"hypercorn.access\": {\n \"formatter\": \"hypercorn.access\",\n \"level\": \"INFO\",\n \"class\": \"logging.StreamHandler\",\n \"stream\": \"ext://sys.stdout\",\n \"filters\": [\n asgi_correlation_id.CorrelationIdFilter()\n ],\n }},\n \"formatters\": {\n \"hypercorn.access\": {\n \"format\": \"%(message)s %(correlation_id)s\",\n }\n },\n \"loggers\": {\n \"hypercorn.access\": {\n \"handlers\": [\n \"hypercorn.access\"\n ],\n \"level\": \"INFO\",\n },\n },\n \"version\": 1\n }\n\n config = Config()\n # write access log to stdout\n config.accesslog = \"-\"\n\n config.logconfig_dict = logConfig\n asyncio.run(serve(app, config))\n```\n\n```\n# run it\n$ python3 test.py\n\n# test it:\n$ curl http://localhost:8080/test\n\n# log on stdout:\nINFO log [7e7ccfff352a428991920d1da2502674] root test_get\n127.0.0.1:34754 - - [14/Dec/2023:10:34:08 +0100] \"GET /test 1.1\" 200 4 \"-\" \"curl/7.76.1\" 7e7ccfff352a428991920d1da2502674\n```\n\n# Integration with [Uvicorn](https://github.com/encode/uvicorn)\nTo add a correlation ID to your [uvicorn](https://github.com/encode/uvicorn) logs, you'll need to add a log filter and change the log formatting. Here's an example of how to configure uvicorn, if you're running a [FastAPI](https://fastapi.tiangolo.com/deployment/manually/) app:\n\n```python\nimport logging\nimport os\n\nimport asgi_correlation_id\nimport uvicorn\nfrom fastapi import APIRouter, FastAPI\nfrom uvicorn.config import LOGGING_CONFIG\n\n\ndef configure_logging():\n console_handler = logging.StreamHandler()\n console_handler.addFilter(asgi_correlation_id.CorrelationIdFilter())\n logging.basicConfig(\n handlers=[console_handler],\n level=\"INFO\",\n format=\"%(levelname)s log [%(correlation_id)s] %(name)s %(message)s\")\n\n\napp = FastAPI(on_startup=[configure_logging])\napp.add_middleware(asgi_correlation_id.CorrelationIdMiddleware)\nrouter = APIRouter()\n\n\n@router.get(\"/test\")\nasync def test_get():\n logger = logging.getLogger()\n logger.info(\"test_get\")\n\n\napp.include_router(router)\n\n\nif __name__ == \"__main__\":\n LOGGING_CONFIG[\"handlers\"][\"access\"][\"filters\"] = [asgi_correlation_id.CorrelationIdFilter()]\n LOGGING_CONFIG[\"formatters\"][\"access\"][\"fmt\"] = \"%(levelname)s access [%(correlation_id)s] %(name)s %(message)s\"\n uvicorn.run(\"test:app\", port=8080, log_level=os.environ.get(\"LOGLEVEL\", \"DEBUG\").lower())\n```\n\n```\n# run it\npython test.py\n\n# test it\ncurl http://localhost:8080/test\n\n# log on stdout\nINFO log [16b61d57f9ff4a85ac80f5cd406e0aa2] root test_get\nINFO access [16b61d57f9ff4a85ac80f5cd406e0aa2] uvicorn.access 127.0.0.1:24810 - \"GET /test HTTP/1.1\" 200\n```\n\n# Extensions\n\nIn addition to the middleware, we've added a couple of extensions for third-party packages.\n\n## Sentry\n\nIf your project has [sentry-sdk](https://pypi.org/project/sentry-sdk/)\ninstalled, correlation IDs will automatically be added to Sentry events as a `transaction_id`.\n\nSee\nthis [blogpost](https://blog.sentry.io/2019/04/04/trace-errors-through-stack-using-unique-identifiers-in-sentry#1-generate-a-unique-identifier-and-set-as-a-sentry-tag-on-issuing-service)\nfor a little bit of detail. The transaction ID is displayed in the event detail view in Sentry and is just an easy way\nto connect logs to a Sentry event.\n\n## Celery\n\n> Note: If you're using the celery integration, install the package with `pip install asgi-correlation-id[celery]`\n\nFor Celery user's there's one primary issue: workers run as completely separate processes, so correlation IDs are lost\nwhen spawning background tasks from requests.\n\nHowever, with some Celery signal magic, we can actually transfer correlation IDs to worker processes, like this:\n\n```python\n@before_task_publish.connect()\ndef transfer_correlation_id(headers) -> None:\n # This is called before task.delay() finishes\n # Here we're able to transfer the correlation ID via the headers kept in our backend\n headers[header_key] = correlation_id.get()\n\n\n@task_prerun.connect()\ndef load_correlation_id(task) -> None:\n # This is called when the worker picks up the task\n # Here we're able to load the correlation ID from the headers\n id_value = task.request.get(header_key)\n correlation_id.set(id_value)\n```\n\nTo configure correlation ID transfer, simply import and run the setup function the package provides:\n\n```python\nfrom asgi_correlation_id.extensions.celery import load_correlation_ids\n\nload_correlation_ids()\n```\n\n### Taking it one step further - Adding Celery tracing IDs\n\nIn addition to transferring request IDs to Celery workers, we've added one more log filter for improving tracing in\ncelery processes. This is completely separate from correlation ID functionality, but is something we use ourselves, so\nkeep in the package with the rest of the signals.\n\nThe log filter adds an ID, `celery_current_id` for each worker process, and an ID, `celery_parent_id` for the process\nthat spawned it.\n\nHere's a quick summary of outputs from different scenarios:\n\n| Scenario | Correlation ID | Celery Current ID | Celery Parent ID |\n|------------------------------------------ |--------------------|-------------------|------------------|\n| Request | \u2705 | | |\n| Request -> Worker | \u2705 | \u2705 | |\n| Request -> Worker -> Another worker | \u2705 | \u2705 | \u2705 |\n| Beat -> Worker | \u2705* | \u2705 | | |\n| Beat -> Worker -> Worker | \u2705* | \u2705 | \u2705 | \u2705 |\n\n*When we're in a process spawned separately from an HTTP request, a correlation ID is still spawned for the first\nprocess in the chain, and passed down. You can think of the correlation ID as an origin ID, while the combination of\ncurrent and parent-ids as a way of linking the chain.\n\nTo add the current and parent IDs, just alter your `celery.py` to this:\n\n```diff\n+ from asgi_correlation_id.extensions.celery import load_correlation_ids, load_celery_current_and_parent_ids\n\nload_correlation_ids()\n+ load_celery_current_and_parent_ids()\n```\n\nIf you wish to correlate celery task IDs through the IDs found in your broker (i.e., the celery `task_id`), use the `use_internal_celery_task_id` argument on `load_celery_current_and_parent_ids`\n```diff\nfrom asgi_correlation_id.extensions.celery import load_correlation_ids, load_celery_current_and_parent_ids\n\nload_correlation_ids()\n+ load_celery_current_and_parent_ids(use_internal_celery_task_id=True)\n```\nNote: `load_celery_current_and_parent_ids` will ignore the `generator` argument when `use_internal_celery_task_id` is set to `True`\n\nTo set up the additional log filters, update your log config like this:\n\n```diff\nLOGGING = {\n 'version': 1,\n 'disable_existing_loggers': False,\n 'filters': {\n 'correlation_id': {\n+ '()': 'asgi_correlation_id.CorrelationIdFilter',\n+ 'uuid_length': 32,\n+ 'default_value': '-',\n+ },\n+ 'celery_tracing': {\n+ '()': 'asgi_correlation_id.CeleryTracingIdsFilter',\n+ 'uuid_length': 32,\n+ 'default_value': '-',\n+ },\n },\n 'formatters': {\n 'web': {\n 'class': 'logging.Formatter',\n 'datefmt': '%H:%M:%S',\n 'format': '%(levelname)s ... [%(correlation_id)s] %(name)s %(message)s',\n },\n+ 'celery': {\n+ 'class': 'logging.Formatter',\n+ 'datefmt': '%H:%M:%S',\n+ 'format': '%(levelname)s ... [%(correlation_id)s] [%(celery_parent_id)s-%(celery_current_id)s] %(name)s %(message)s',\n+ },\n },\n 'handlers': {\n 'web': {\n 'class': 'logging.StreamHandler',\n 'filters': ['correlation_id'],\n 'formatter': 'web',\n },\n+ 'celery': {\n+ 'class': 'logging.StreamHandler',\n+ 'filters': ['correlation_id', 'celery_tracing'],\n+ 'formatter': 'celery',\n+ },\n },\n 'loggers': {\n 'my_project': {\n+ 'handlers': ['celery' if any('celery' in i for i in sys.argv) else 'web'],\n 'level': 'DEBUG',\n 'propagate': True,\n },\n },\n}\n```\n\nWith these IDs configured you should be able to:\n\n1. correlate all logs from a single origin, and\n2. piece together the order each log was run, and which process spawned which\n\n#### Example\n\nWith everything configured, assuming you have a set of tasks like this:\n\n```python\n@celery.task()\ndef debug_task() -> None:\n logger.info('Debug task 1')\n second_debug_task.delay()\n second_debug_task.delay()\n\n\n@celery.task()\ndef second_debug_task() -> None:\n logger.info('Debug task 2')\n third_debug_task.delay()\n fourth_debug_task.delay()\n\n\n@celery.task()\ndef third_debug_task() -> None:\n logger.info('Debug task 3')\n fourth_debug_task.delay()\n fourth_debug_task.delay()\n\n\n@celery.task()\ndef fourth_debug_task() -> None:\n logger.info('Debug task 4')\n```\n\nyour logs could look something like this:\n\n```\n correlation-id current-id\n | parent-id |\n | | |\nINFO [3b162382e1] [ - ] [93ddf3639c] project.tasks - Debug task 1\nINFO [3b162382e1] [93ddf3639c] [24046ab022] project.tasks - Debug task 2\nINFO [3b162382e1] [93ddf3639c] [cb5595a417] project.tasks - Debug task 2\nINFO [3b162382e1] [24046ab022] [08f5428a66] project.tasks - Debug task 3\nINFO [3b162382e1] [24046ab022] [32f40041c6] project.tasks - Debug task 4\nINFO [3b162382e1] [cb5595a417] [1c75a4ed2c] project.tasks - Debug task 3\nINFO [3b162382e1] [08f5428a66] [578ad2d141] project.tasks - Debug task 4\nINFO [3b162382e1] [cb5595a417] [21b2ef77ae] project.tasks - Debug task 4\nINFO [3b162382e1] [08f5428a66] [8cad7fc4d7] project.tasks - Debug task 4\nINFO [3b162382e1] [1c75a4ed2c] [72a43319f0] project.tasks - Debug task 4\nINFO [3b162382e1] [1c75a4ed2c] [ec3cf4113e] project.tasks - Debug task 4\n```\n",
"bugtrack_url": null,
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