drf-api-logger-with-user 1.3.0
An API Logger for your Django Rest Framework project.
License: Apache 2.0
Requires Python: >=3.6

# DRF API Logger
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An API Logger for your Django Rest Framework project.

It logs all the API information for content type "application/json".
1. URL
2. Request Body
3. Request Headers
4. Request Method
5. API Response
6. Status Code
7. API Call Time
8. Server Execution Time
9. Client IP Address


You can log API information into the database or listen to the logger signals for different use cases, or you can do both.

* The logger uses a separate thread to run, so it won't affect your API response time.

## Installation

Install or add drf-api-logger.
```shell script
pip install drf-api-logger
```

Add in INSTALLED_APPS
```python
INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',

    'drf_api_logger_with_user',  #  Add here
]
```

Add in MIDDLEWARE
```python
MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',

    'drf_api_logger_with_user.middleware.api_logger_middleware.APILoggerMiddleware', # Add here
]
```


#### * Add these lines in the Django Rest Framework settings file.

## Store logs into the database
Log every request into the database.
```python
DRF_API_LOGGER_DATABASE = True  # Default to False
```
* Logs will be available in the Django Admin Panel.

* The search bar will search in Request Body, Response, Headers, and API URL.

* You can also filter the logs based on the "added_on" date, Status Code, and Request Methods.

![Alt text](https://raw.githubusercontent.com/vishalanandl177/DRF-API-Logger/master/logs.png?raw=true, "Logger")

![Alt text](https://raw.githubusercontent.com/vishalanandl177/DRF-API-Logger/master/graph.png?raw=true, "Graph")

![Alt text](https://raw.githubusercontent.com/vishalanandl177/DRF-API-Logger/master/lists.png?raw=true, "Lists")

![Alt text](https://raw.githubusercontent.com/vishalanandl177/DRF-API-Logger/master/details.png?raw=true, "Details")

Note: Make sure to migrate. It will create a table for the logger if "DRF_API_LOGGER_DATABASE" is True else if already exists, it will delete the table.

## To listen for the logger signals.
Listen to the signal as soon as any API is called. So you can log the API data into a file or for different use cases.
```python
DRF_API_LOGGER_SIGNAL = True  # Default to False
```
Example code to listen to the API Logger Signal.
```python
"""
Import API_LOGGER_SIGNAL
"""
from drf_api_logger_with_user import API_LOGGER_SIGNAL


"""
Create a function that is going to listen to the API logger signals.
"""
def listener_one(**kwargs):
    print(kwargs)

def listener_two(**kwargs):
    print(kwargs)

"""
It will listen to all the API logs whenever an API is called.
You can also listen signals in multiple functions.
"""
API_LOGGER_SIGNAL.listen += listener_one
API_LOGGER_SIGNAL.listen += listener_two

"""
Unsubscribe to signals.
"""

API_LOGGER_SIGNAL.listen -= listener_one
```

### Queue

DRF API Logger usage queue to hold the logs before inserting them into the database. Once the queue is full, it bulk inserts into the database.

Specify the queue size.
```python
DRF_LOGGER_QUEUE_MAX_SIZE = 50  # Default to 50 if not specified.
```

### Interval

DRF API Logger also waits for a period of time. If the queue is not full and there are some logs to be inserted, it inserts after the interval ends.

Specify an interval (In Seconds).
```python
DRF_LOGGER_INTERVAL = 10  # In Seconds, Default to 10 seconds if not specified.
```
Note: The API call time (added_on) is a timezone-aware datetime object. It is the actual time of the API call irrespective of interval value or queue size.
### Skip namespace
You can skip the entire app to be logged into the database by specifying the namespace of the app as a list.
```python
DRF_API_LOGGER_SKIP_NAMESPACE = ['APP_NAMESPACE1', 'APP_NAMESPACE2']
```

### Skip URL Name
You can also skip any API to be logged by using the url_name of the API.
```python
DRF_API_LOGGER_SKIP_URL_NAME = ['url_name1', 'url_name2']
```

Note: It does not log Django Admin Panel API calls.

### Hide Sensitive Data From Logs
You may wish to hide sensitive information from being exposed in the logs. 
You do this by setting `DRF_API_LOGGER_EXCLUDE_KEYS` in settings.py to a list of your desired sensitive keys. 
The default is
```python
DRF_API_LOGGER_EXCLUDE_KEYS = ['password', 'token', 'access', 'refresh']
# Sensitive data will be replaced with "***FILTERED***".
```

### Change the default database to store API logs
```python
DRF_API_LOGGER_DEFAULT_DATABASE = 'default'  # Default to "default" if not specified
"""
Make sure to migrate the database specified in DRF_API_LOGGER_DEFAULT_DATABASE.
"""
```

### Want to identify slow APIs? (Optional)
You can also identify slow APIs by specifying `DRF_API_LOGGER_SLOW_API_ABOVE` in settings.py.

A new filter (By API Performance) will be visible, and you can choose a slow or fast API.
```python
DRF_API_LOGGER_SLOW_API_ABOVE = 200  # Default to None
# Specify in milli-seconds.
```

### Want to log only selected request methods? (Optional)
You can log only selected methods by specifying `DRF_API_LOGGER_METHODS` in settings.py.
```python
DRF_API_LOGGER_METHODS = ['GET', 'POST', 'DELETE', 'PUT']  # Default to an empty list (Log all the requests).
```

### Want to log only selected response status codes? (Optional)
You can log only selected responses by specifying `DRF_API_LOGGER_STATUS_CODES` in settings.py.
```python
DRF_API_LOGGER_STATUS_CODES = [200, 400, 404, 500]  # Default to an empty list (Log all responses).
```

### Want to log custom content types? (Optional)
You can log custom content types by specifying `DRF_API_LOGGER_CONTENT_TYPES` in settings.py.
The specified content types will be added alongside with default content types.
```python
DRF_API_LOGGER_CONTENT_TYPES = [
    "application/json",
    "application/vnd.api+json",
    "application/gzip",
    "application/octet-stream",
]  # Default content types.
```

### Want to see the API information in the local timezone? (Optional)
### Want to skip selected response status codes? (Optional)
You can skip selected responses by specifying `DRF_API_LOGGER_SKIP_STATUS_CODES` in settings.py.
```python
DRF_API_LOGGER_SKIP_STATUS_CODES = ['301', '401']  # Default to empty list (Log all responses).
```

### Want to see the API information in local timezone? (Optional)
You can also change the timezone by specifying `DRF_API_LOGGER_TIMEDELTA` in settings.py.
It won't change the Database timezone. It will remain UTC or the timezone you have defined.
```python
DRF_API_LOGGER_TIMEDELTA = 330 # UTC + 330 Minutes = IST (5:Hours, 30:Minutes ahead from UTC) 
# Specify in minutes.
```
```python
# You can specify negative values for the countries behind the UTC timezone.
DRF_API_LOGGER_TIMEDELTA = -30  # Example
```

### Ignore data based on maximum request or response body? (Optional)
Request/Response bodies
By default, DRF API LOGGER will save the request and response bodies for each request for future viewing
no matter how large. If DRF API LOGGER is used in production under heavy volume with
large bodies this can have a huge impact on space/time performance.

This behavior can be configured with the following options additional:
```python
# DRF API LOGGER takes anything < 0 as no limit.
# If response body > 1024 bytes, ignore.
DRF_API_LOGGER_MAX_REQUEST_BODY_SIZE = 1024  # default to -1, no limit.
DRF_API_LOGGER_MAX_RESPONSE_BODY_SIZE = 1024  # default to -1, no limit.
```

### Tracing
You can enable tracing by specifying `DRF_API_LOGGER_ENABLE_TRACING` in settings.py.
This will add a tracing ID (UUID.uuid4()) in the signals of the DRF API Logger (if enabled).

In views, you can use request.tracing_id to get the tracing ID.
```python
DRF_API_LOGGER_ENABLE_TRACING = True  # default to False
```

### Want to generate your tracing uuid?
By default, the DRF API Logger uses uuid.uuid4() to generate tracing id.
If you want to use your custom function to generate uuid, specify DRF_API_LOGGER_TRACING_FUNC in the setting.py file.
```python
DRF_API_LOGGER_TRACING_FUNC = 'foo.bar.func_name'
```

### Tracing already present in headers?
If the tracing ID is already coming as a part of request headers, you can specify the header name.
```python
DRF_API_LOGGER_TRACING_ID_HEADER_NAME: str = 'X_TRACING_ID'  # Replace with actual header name.
```

### API with or without Host
You can specify whether an endpoint of API should have absolute URI or not by setting this variable in the DRF settings.py file.
```python
DRF_API_LOGGER_PATH_TYPE = 'ABSOLUTE'  # Default to ABSOLUTE if not specified
# Possible values are ABSOLUTE, FULL_PATH or RAW_URI
```

Considering we are accessing the following URL: http://127.0.0.1:8000/api/v1/?page=123
DRF_API_LOGGER_PATH_TYPE possible values are:
1. ABSOLUTE (Default) :   

    Function used ```request.build_absolute_uri()```
    
    Output: ```http://127.0.0.1:8000/api/v1/?page=123```
    
2. FULL_PATH

    Function used ```request.get_full_path()```
    
    Output: ```/api/v1/?page=123```
    
3. RAW_URI

    Function used ```request.get_raw_uri()```
    
    Output: ```http://127.0.0.1:8000/api/v1/?page=123```
    
    Note: Similar to ABSOLUTE but skip allowed hosts protection, so may return an insecure URI.


### Use the DRF API Logger Model to query 
You can use the DRF API Logger Model to query some information.

Note: Make sure to set "DRF_API_LOGGER_DATABASE = True" in settings.py file.
```
from drf_api_logger_with_user.models import APILogsModel

"""
Example:
Select records for status_code 200.
"""

result_for_200_status_code = APILogsModel.objects.filter(status_code=200)
```

DRF API Logger Model:
```python
class APILogsModel(Model):
   id = models.BigAutoField(primary_key=True)
   api = models.CharField(max_length=1024, help_text='API URL')
   headers = models.TextField()
   body = models.TextField()
   method = models.CharField(max_length=10, db_index=True)
   client_ip_address = models.CharField(max_length=50)
   response = models.TextField()
   status_code = models.PositiveSmallIntegerField(help_text='Response status code', db_index=True)
   execution_time = models.DecimalField(decimal_places=5, max_digits=8,
                                       help_text='Server execution time (Not complete response time.)')
   added_on = models.DateTimeField()
   
   def __str__(self):
      return self.api

   class Meta:
      db_table = 'drf_api_logs'
      verbose_name = 'API Log'
      verbose_name_plural = 'API Logs'

```

### Note:
After some time, there will be too much data in the database. Searching and filtering may get slower.
If you want, you can delete or archive the older data.
To improve the searching or filtering, try to add indexes in the 'drf_api_logs' table.