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logzio-python-handler

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Python logging handler that sends your logs to Logz.io using the https bulk input

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# The Logz.io Python Handler

### Deprecation announcement

Version 3.0.0 of this project ends support for Python 2.7, 3.3, and 3.4. We recommend migrating your projects to Python
3.5 or newer as soon as possible. We'll be happy to answer any questions you have
in [a GitHub issue](https://github.com/logzio/logzio-python-handler/issues).

Thanks! <br>
The Logz.io Integrations team

</th></tr></table>

This is a Python handler that sends logs in bulk over HTTPS to Logz.io.
The handler uses a subclass named LogzioSender (which can be used without this handler as well, to ship raw data).
The LogzioSender class opens a new Thread, that consumes from the logs queue. Each iteration (its frequency of which can
be configured by the logs_drain_timeout parameter), will try to consume the queue in its entirety.
Logs will get divided into separate bulks, based on their size.
LogzioSender will check if the main thread is alive. In case the main thread quits, it will try to consume the queue one
last time, and then exit. So your program can hang for a few seconds, until the logs are drained.
In case the logs failed to be sent to Logz.io after a couple of tries, they will be written to the local file system.
You can later upload them to Logz.io using curl.

## Installation

```bash
pip install logzio-python-handler
```

If you'd like to use [Trace context](#trace-context), you need to install the OpenTelemetry logging instrumentation
dependency by running the following command:

```bash
pip install logzio-python-handler[opentelemetry-logging]
```

## Tested Python Versions

CI will build this handler and test against:

- "3.5"
- "3.6"
- "3.7"
- "3.8"
- "3.9"
- "3.10"
- "3.11"
- "3.12"
- "3.13"
- "3.14"

We can't ensure compatibility to any other version, as we can't test it automatically.

To run tests:

```bash
$ pip install tox
$ tox
...

```

## Python configuration

#### Config File

```python
[handlers]
keys = LogzioHandler

[handler_LogzioHandler]

class =logzio.handler.LogzioHandler

formatter = logzioFormat

# Parameters must be set in order. Replace these parameters with your configuration.
args = ('<<LOG-SHIPPING-TOKEN>>', '<<LOG-TYPE>>',
        << TIMEOUT >>, 'https://<<LISTENER-HOST>>:8071', << DEBUG-FLAG >>, << NETWORKING-TIMEOUT >>, << RETRY-LIMIT >>, << RETRY-TIMEOUT >>)

[formatters]
keys = logzioFormat

[loggers]
keys = root

[logger_root]
handlers = LogzioHandler
level = INFO

[formatter_logzioFormat]
format = {"additional_field": "value"}
```

*args=() arguments, by order*

- Your logz.io token
- Log type, for searching in logz.io (defaults to "python")
- Time to sleep between draining attempts (defaults to "3")
- Logz.io Listener address (defaults to "https://listener.logz.io:8071")
- Debug flag. Set to True, will print debug messages to stdout. (defaults to "False")
- Backup logs flag. Set to False, will disable the local backup of logs in case of failure. (defaults to "True")
- Network timeout, in seconds, int or float, for sending the logs to logz.io. (defaults to 10)
- Retries number (retry_no, defaults to 4).
- Retry timeout (retry_timeout) in seconds (defaults to 2).

Please note, that you have to configure those parameters by this exact order.
i.e. you cannot set Debug to true, without configuring all of the previous parameters as well.

#### Dict Config

```python
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'logzioFormat': {
            'format': '{"additional_field": "value"}',
            'validate': False
        }
    },
    'handlers': {
        'logzio': {
            'class': 'logzio.handler.LogzioHandler',
            'level': 'INFO',
            'formatter': 'logzioFormat',
            'token': '<<LOGZIO-TOKEN>>',
            'logzio_type': 'python-handler',
            'logs_drain_timeout': 5,
            'url': 'https://<<LOGZIO-URL>>:8071',
            'retries_no': 4,
            'retry_timeout': 2,
        }
    },
    'loggers': {
        '': {
            'level': 'DEBUG',
            'handlers': ['logzio'],
            'propagate': True
        }
    }
}
```

Replace:

* <<LOGZIO-TOKEN>> - your logz.io account token.
* <<LOGZIO-URL>> - logz.io url, as
  described [here](https://docs.logz.io/user-guide/accounts/account-region.html#regions-and-urls).

#### Serverless platforms

If you're using a serverless function, you'll need to import and add the LogzioFlusher annotation before your sender
function. To do this, in the code sample below, uncomment the `import` statement and the `@LogzioFlusher(logger)`
annotation line.  
**Note:** For the LogzioFlusher to work properly, you'll need to make sure that the Logz.io. handler is added to the
root logger. See the configuration above for an example.

#### Dynamic Extra Fields

If you prefer, you can add extra fields to your logs dynamically, and not pre-defining them in the configuration.
This way, you can allow different logs to have different extra fields.
Example in the code below.

#### Code Example

```python
import logging
import logging.config

# If you're using a serverless function, uncomment.
# from logzio.flusher import LogzioFlusher

# If you'd like to leverage the dynamic extra fields feature, uncomment.
# from logzio.handler import ExtraFieldsLogFilter

# Say I have saved my configuration as a dictionary in a variable named 'LOGGING' - see 'Dict Config' sample section
logging.config.dictConfig(LOGGING)
logger = logging.getLogger('superAwesomeLogzioLogger')

# If you're using a serverless function, uncomment.
# @LogzioFlusher(logger)
def my_func():
    logger.info('Test log')
    logger.warning('Warning')

try:
        1 / 0
    except:
        logger.exception("Supporting exceptions too!")

# Example additional code that demonstrates how to dynamically add/remove fields within the code, make sure class is imported.

logger.info("Test log")  # Outputs: {"message":"Test log"}

extra_fields = {"foo": "bar", "counter": 1}
    logger.addFilter(ExtraFieldsLogFilter(extra_fields))
    logger.warning("Warning test log")  # Outputs: {"message":"Warning test log","foo":"bar","counter":1}

error_fields = {"err_msg": "Failed to run due to exception.", "status_code": 500}
    logger.addFilter(ExtraFieldsLogFilter(error_fields))
    logger.error(
        "Error test log")  # Outputs: {"message":"Error test log","foo":"bar","counter":1,"err_msg":"Failed to run due to exception.","status_code":500}

# If you'd like to remove filters from future logs using the logger.removeFilter option:
    logger.removeFilter(ExtraFieldsLogFilter(error_fields))
    logger.debug("Debug test log")  # Outputs: {"message":"Debug test log","foo":"bar","counter":1}

```

#### Extra Fields

In case you need to dynamic metadata to a speific log and not [dynamically to the logger](#dynamic-extra-fields), other
than the constant metadata from the formatter, you can use the "extra" parameter.
All key values in the dictionary passed in "extra" will be presented in Logz.io as new fields in the log you are
sending.
Please note, that you cannot override default fields by the python logger (i.e. lineno, thread, etc..)
For example:

```python
logger.info('Warning', extra={'extra_key': 'extra_value'})
```

#### Trace context

If you're sending traces with OpenTelemetry instrumentation (auto or manual), you can correlate your logs with the trace
context.
That way, your logs will have traces data in it, such as service name, span id and trace id.

Make sure to install the OpenTelemetry logging instrumentation dependecy by running the following command:

```shell
pip install logzio-python-handler[opentelemetry-logging]
```

To enable this feature, set the `add_context` param in your handler configuration to `True`, like in this example:

```python
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'logzioFormat': {
            'format': '{"additional_field": "value"}',
            'validate': False
        }
    },
    'handlers': {
        'logzio': {
            'class': 'logzio.handler.LogzioHandler',
            'level': 'INFO',
            'formatter': 'logzioFormat',
            'token': '<<LOGZIO-TOKEN>>',
            'logzio_type': 'python-handler',
            'logs_drain_timeout': 5,
            'url': 'https://<<LOGZIO-URL>>:8071',
            'retries_no': 4,
            'retry_timeout': 2,
            'add_context': True
        }
    },
    'loggers': {
        '': {
            'level': 'DEBUG',
            'handlers': ['logzio'],
            'propagate': True
        }
    }
}
```

#### Django configuration

```python
LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format': '%(levelname)s %(asctime)s %(module)s %(process)d %(thread)d %(message)s'
        },
        'logzioFormat': {
            'format': '{"additional_field": "value"}',
            'validate': False
        }
    },
    'handlers': {
        'console': {
            'class': 'logging.StreamHandler',
            'level': 'DEBUG',
            'formatter': 'verbose'
        },
        'logzio': {
            'class': 'logzio.handler.LogzioHandler',
            'level': 'INFO',
            'formatter': 'logzioFormat',
            'token': 'token',
            'logzio_type': "django",
            'logs_drain_timeout': 5,
            'url': 'https://listener.logz.io:8071',
            'debug': True,
            'network_timeout': 10,
        },
    },
    'loggers': {
        'django': {
            'handlers': ['console', ],
            'level': os.getenv('DJANGO_LOG_LEVEL', 'INFO')
        },
        'appname': {
            'handlers': ['console', 'logzio'],
            'level': 'INFO'
        }
    }
}

```

## Release Notes
- 4.1.7
    - `logzio/sender.py`: 
      - Added `Lock` import and `_flush_lock` instance variable
      - Modified `_flush_queue()` to use lock for thread-safe flushing
      - Modified `_get_messages_up_to_max_allowed_size()` to use non-blocking `queue.get(block=False)`
    - `tests/test_thread_safety.py`: Added comprehensive tests for thread safety
- 4.1.6
    - Update dependencies
- 4.1.5
    - Update dependencies
- 4.1.4
    - Upgrade trace context opentelemetry-instrumentation-logging package version from v0.39b0 to v4.50b0
- 4.1.3
    - Enhanced LogzioSender to dynamically set the user-agent header using the package version.
    - Adjusted GitHub Actions to trigger on new releases.
    - Streamlined versioning in deployments by automating Git tag extraction for PACKAGE_VERSION.
- 4.1.2
    - Fix DeprecationWarning
    - Adjusted tests to logging:3.12
- 4.1.1
    - Fix flusher issues with serverless
- 4.1.0
    - Add ability to dynamically attach extra fields to the logs.
    - Import opentelemetry logging dependency only if trace context is enabled and dependency is installed manually.
        - Updated `opentelemetry-instrumentation-logging==0.39b0`
    - Updated `setuptools>=68.0.0`
    - Added tests for Python versions: 3.9, 3.10, 3.11
- 4.0.2
    - Fix bug for logging exceptions ([#76](https://github.com/logzio/logzio-python-handler/pull/76))
- 4.0.1
    - Updated `protobuf>=3.20.2`.
    - Added dependency `setuptools>=65.5.1`

- 4.0.0
    - Add ability to automatically attach trace context to the logs.

<details>
  <summary markdown="span"> Expand to check old versions </summary>

- 3.1.1
    - Bug fixes (issue #68, exception message formatting)
    - Added CI: Tests and Auto release

- 3.1.0
    - Bug fixes
    - Retry number and timeout is now configurable

- 3.0.0
    - Deprecated `python2.7` & `python3.4`
    - Changed log levels on `_flush_queue()` method (@hilsenrat)

- 2.0.15
    - Added flusher decorator for serverless platforms(@mcmasty)
    - Add support for `python3.7` and `python3.8`

- 2.0.13
    - Add support for `pypy` and `pypy3`(@rudaporto-olx)
    - Add timeout for requests.post() (@oseemann)
- 2.0.12 - Support disable logs local backup
- 2.0.11 - Completely isolate exception from the message
- 2.0.10 - Not ignoring formatting on exceptions
- 2.0.9 - Support extra fields on exceptions too (Thanks @asafc64!)
- 2.0.8 - Various PEP8, testings and logging changes (Thanks @nir0s!)
- 2.0.7 - Make sure sending thread is alive after fork (Thanks @jo-tham!)
- 2.0.6 - Add "flush()" method to manually drain the queue (Thanks @orenmazor!)
- 2.0.5 - Support for extra fields
- 2.0.4 - Publish package as source along wheel, and supprt python3 packagin (Thanks @cchristous!)
- 2.0.3 - Fix bug that consumed more logs while draining than Logz.io's bulk limit
- 2.0.2 - Support for formatted messages (Thanks @johnraz!)
- 2.0.1 - Added __all__ to __init__.py, so support * imports
- 2.0.0 - Production, stable release.
    - *BREAKING* - Configuration option logs_drain_count was removed, and the order of the parameters has changed for
      better simplicity. Please review the parameters section above.
    - Introducing the LogzioSender class, which is generic and can be used without the handler wrap to ship raw data to
      Logz.io. Just create a new instance of the class, and use the append() method.
    - Simplifications and Robustness
    - Full testing framework
- 1.X - Beta versions

</details>

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