feat: Add InfluxLoggingHandler to use the InfluxClient in python nati…

…ve logging (#405)

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ### Features
 1. [#412](https://github.com/influxdata/influxdb-client-python/pull/412): `DeleteApi` uses default value from `InfluxDBClient.org` if an `org` parameter is not specified
+2. [#405](https://github.com/influxdata/influxdb-client-python/pull/405): Add `InfluxLoggingHandler`. A handler to use the client in native python logging.
 
 ### CI
 1. [#411](https://github.com/influxdata/influxdb-client-python/pull/411): Use new Codecov uploader for reporting code coverage
@@ -45,6 +46,7 @@ This release introduces a support for new version of InfluxDB OSS API definition
 1. [#408](https://github.com/influxdata/influxdb-client-python/pull/408): Improve error message when the client cannot find organization by name
 1. [#407](https://github.com/influxdata/influxdb-client-python/pull/407): Use `pandas.concat()` instead of deprecated `DataFrame.append()` [DataFrame]
 
+
 ## 1.25.0 [2022-01-20]
 
 ### Features

examples/README.md

@@ -9,6 +9,7 @@
 - [import_data_set_sync_batching.py](import_data_set_sync_batching.py) - How to use [RxPY](https://rxpy.readthedocs.io/en/latest/) to prepare batches for synchronous write into InfluxDB
 - [write_api_callbacks.py](write_api_callbacks.py) - How to handle batch events
 - [write_structured_data.py](write_structured_data.py) - How to write structured data - [NamedTuple](https://docs.python.org/3/library/collections.html#collections.namedtuple), [Data Classes](https://docs.python.org/3/library/dataclasses.html) - (_requires Python v3.8+_)
+- [logging_handler.py](logging_handler.py) - How to set up a python native logging handler that writes to InfluxDB
 
 ## Queries
 - [query.py](query.py) - How to query data into `FluxTable`s, `Stream` and `CSV`
@@ -28,4 +29,4 @@
 - [influxdb_18_example.py](influxdb_18_example.py) - How to connect to InfluxDB 1.8
 - [nanosecond_precision.py](nanosecond_precision.py) - How to use nanoseconds precision
 - [invocable_scripts.py](invocable_scripts.py) - How to use Invocable scripts Cloud API to create custom endpoints that query data
-
+

examples/logging_handler.py

@@ -0,0 +1,54 @@
+"""
+Show the usage of influx with python native logging.
+
+This is useful if you
+* want to log to influx and a local file.
+* want to set up influx logging in a project without specifying it in submodules
+"""
+import datetime
+import logging
+import time
+
+from influxdb_client import InfluxLoggingHandler, WritePrecision, Point
+from influxdb_client.client.write_api import SYNCHRONOUS
+
+DATA_LOGGER_NAME = '…'
+
+
+def setup_logger():
+    """
+    Set up data logger with the influx logging handler.
+
+    This can happen in your core module.
+    """
+    influx_logging_handler = InfluxLoggingHandler(
+        url="http://localhost:8086", token="my-token", org="my-org", bucket="my-bucket",
+        client_args={'timeout': 30_000},  # optional configuration of the client
+        write_api_args={'write_options': SYNCHRONOUS})  # optional configuration of the write api
+    influx_logging_handler.setLevel(logging.DEBUG)
+
+    data_logger = logging.getLogger(DATA_LOGGER_NAME)
+    data_logger.setLevel(logging.DEBUG)
+    data_logger.addHandler(influx_logging_handler)
+    # feel free to add other handlers here.
+    # if you find yourself writing filters e.g. to only log points to influx, think about adding a PR :)
+
+
+def use_logger():
+    """Use the logger. This can happen in any submodule."""
+    # `data_logger` will have the influx_logging_handler attached if setup_logger was called somewhere.
+    data_logger = logging.getLogger(DATA_LOGGER_NAME)
+    # write a line yourself
+    data_logger.debug(f"my-measurement,host=host1 temperature=25.3 {int(time.time() * 1e9)}")
+    # or make use of the influxdb helpers like Point
+    data_logger.debug(
+        Point('my-measurement')
+            .tag('host', 'host1')
+            .field('temperature', 25.3)
+            .time(datetime.datetime.utcnow(), WritePrecision.MS)
+    )
+
+
+if __name__ == "__main__":
+    setup_logger()
+    use_logger()

influxdb_client/__init__.py

@@ -383,6 +383,7 @@
 from influxdb_client.client.users_api import UsersApi
 from influxdb_client.client.write_api import WriteApi, WriteOptions
 from influxdb_client.client.influxdb_client import InfluxDBClient
+from influxdb_client.client.loggingHandler import InfluxLoggingHandler
 from influxdb_client.client.write.point import Point
 
 from influxdb_client.version import CLIENT_VERSION

influxdb_client/client/loggingHandler.py

@@ -0,0 +1,64 @@
+"""Use the influxdb_client with python native logging."""
+import logging
+
+from influxdb_client import InfluxDBClient
+
+
+class InfluxLoggingHandler(logging.Handler):
+    """
+    InfluxLoggingHandler instances dispatch logging events to influx.
+
+    There is no need to set a Formatter.
+    The raw input will be passed on to the influx write api.
+    """
+
+    DEFAULT_LOG_RECORD_KEYS = list(logging.makeLogRecord({}).__dict__.keys()) + ['message']
+
+    def __init__(self, *, url, token, org, bucket, client_args=None, write_api_args=None):
+        """
+        Initialize defaults.
+
+        The arguments `client_args` and `write_api_args` can be dicts of kwargs.
+        They are passed on to the InfluxDBClient and write_api calls respectively.
+        """
+        super().__init__()
+
+        self.bucket = bucket
+
+        client_args = {} if client_args is None else client_args
+        self.client = InfluxDBClient(url=url, token=token, org=org, **client_args)
+
+        write_api_args = {} if write_api_args is None else write_api_args
+        self.write_api = self.client.write_api(**write_api_args)
+
+    def __del__(self):
+        """Make sure all resources are closed."""
+        self.close()
+
+    def close(self) -> None:
+        """Close the write_api, client and logger."""
+        self.write_api.close()
+        self.client.close()
+        super().close()
+
+    def emit(self, record: logging.LogRecord) -> None:
+        """Emit a record via the influxDB WriteApi."""
+        try:
+            message = self.format(record)
+            extra = self._get_extra_values(record)
+            return self.write_api.write(record=message, **extra)
+        except (KeyboardInterrupt, SystemExit):
+            raise
+        except (Exception,):
+            self.handleError(record)
+
+    def _get_extra_values(self, record: logging.LogRecord) -> dict:
+        """
+        Extract all items from the record that were injected via extra.
+
+        Example: `logging.debug(msg, extra={key: value, ...})`.
+        """
+        extra = {'bucket': self.bucket}
+        extra.update({key: value for key, value in record.__dict__.items()
+                      if key not in self.DEFAULT_LOG_RECORD_KEYS})
+        return extra

influxdb_client/client/write/point.py

@@ -1,6 +1,5 @@
 """Point data structure to represent LineProtocol."""
 
-
 import math
 from builtins import int
 from datetime import datetime, timedelta
@@ -146,7 +145,6 @@ def __init__(self, measurement_name):
         self._name = measurement_name
         self._time = None
         self._write_precision = DEFAULT_WRITE_PRECISION
-        pass
 
     def time(self, time, write_precision=DEFAULT_WRITE_PRECISION):
         """
@@ -195,6 +193,15 @@ def write_precision(self):
         """Get precision."""
         return self._write_precision
 
+    @classmethod
+    def set_str_rep(cls, rep_function):
+        """Set the string representation for all Points."""
+        cls.__str___rep = rep_function
+
+    def __str__(self):
+        """Create string representation of this Point."""
+        return self.to_line_protocol()
+
 
 def _append_tags(tags):
     _return = []

tests/test_loggingHandler.py

@@ -0,0 +1,149 @@
+import logging
+import unittest
+import unittest.mock
+
+import urllib3
+
+from influxdb_client import InfluxLoggingHandler, InfluxDBClient, WriteApi, WritePrecision, Point
+
+
+class LoggingBaseTestCase(unittest.TestCase):
+    fake_line_record = "tag,field=value 123456"
+    URL_TOKEN_ORG = {
+        'url': 'http://example.com',
+        'token': 'my-token',
+        'org': 'my-org',
+    }
+    BUCKET = 'my-bucket'
+
+    def setUp(self) -> None:
+        self.mock_InfluxDBClient = unittest.mock.patch("influxdb_client.client.loggingHandler.InfluxDBClient").start()
+        self.mock_client = unittest.mock.MagicMock(spec=InfluxDBClient)
+        self.mock_write_api = unittest.mock.MagicMock(spec=WriteApi)
+        self.mock_client.write_api.return_value = self.mock_write_api
+        self.mock_InfluxDBClient.return_value = self.mock_client
+
+    def gen_handler_and_logger(self):
+        self.handler = InfluxLoggingHandler(**self.URL_TOKEN_ORG, bucket=self.BUCKET)
+        self.handler.setLevel(logging.DEBUG)
+
+        self.logger = logging.getLogger("test-logger")
+        self.logger.setLevel(logging.DEBUG)
+
+    def tearDown(self) -> None:
+        unittest.mock.patch.stopall()
+
+
+class TestHandlerCreation(LoggingBaseTestCase):
+    def test_can_create_handler(self):
+        self.handler = InfluxLoggingHandler(**self.URL_TOKEN_ORG, bucket=self.BUCKET)
+        self.mock_InfluxDBClient.assert_called_once_with(**self.URL_TOKEN_ORG)
+        self.assertEqual(self.BUCKET, self.handler.bucket)
+        self.mock_client.write_api.assert_called_once_with()
+
+    def test_can_create_handler_with_optional_args_for_client(self):
+        self.handler = InfluxLoggingHandler(**self.URL_TOKEN_ORG, bucket=self.BUCKET,
+                                            client_args={'arg2': 2.90, 'optArg': 'whot'})
+        self.mock_InfluxDBClient.assert_called_once_with(**self.URL_TOKEN_ORG, arg2=2.90, optArg="whot")
+        self.mock_client.write_api.assert_called_once_with()
+
+    def test_can_create_handler_with_args_for_write_api(self):
+        self.handler = InfluxLoggingHandler(**self.URL_TOKEN_ORG, bucket=self.BUCKET,
+                                            client_args={'arg2': 2.90, 'optArg': 'whot'},
+                                            write_api_args={'foo': 'bar'})
+        self.mock_InfluxDBClient.assert_called_once_with(**self.URL_TOKEN_ORG, arg2=2.90, optArg="whot")
+        self.mock_client.write_api.assert_called_once_with(foo='bar')
+
+
+class CreatedHandlerTestCase(LoggingBaseTestCase):
+    def setUp(self) -> None:
+        super().setUp()
+        self.gen_handler_and_logger()
+
+
+class LoggingSetupAndTearDown(CreatedHandlerTestCase):
+    def test_is_handler(self):
+        self.assertIsInstance(self.handler, logging.Handler)
+
+    def test_set_up_client(self):
+        self.mock_InfluxDBClient.assert_called_once()
+
+    def test_closes_connections_on_close(self):
+        self.handler.close()
+        self.mock_write_api.close.assert_called_once()
+        self.mock_client.close.assert_called_once()
+
+    def test_handler_can_be_attached_to_logger(self):
+        self.logger.addHandler(self.handler)
+        self.assertTrue(self.logger.hasHandlers())
+        self.assertTrue(self.handler in self.logger.handlers)
+
+
+class LoggingWithAttachedHandler(CreatedHandlerTestCase):
+
+    def setUp(self) -> None:
+        super().setUp()
+        self.logger.addHandler(self.handler)
+
+
+class LoggingHandlerTest(LoggingWithAttachedHandler):
+
+    def test_can_log_str(self):
+        self.logger.debug(self.fake_line_record)
+        self.mock_write_api.write.assert_called_once_with(bucket="my-bucket", record=self.fake_line_record)
+
+    def test_can_log_points(self):
+        point = Point("measurement").field("field_name", "field_value").time(333, WritePrecision.NS)
+        self.logger.debug(point)
+        self.mock_write_api.write.assert_called_once_with(bucket="my-bucket", record=str(point))
+
+    def test_catches_urllib_exceptions(self):
+        self.mock_write_api.write.side_effect = urllib3.exceptions.HTTPError()
+        try:
+            with unittest.mock.patch("logging.sys.stderr") as _:
+                # Handler writes logging errors to stderr. Don't display it in the test output.
+                self.logger.debug(self.fake_line_record)
+        finally:
+            self.mock_write_api.write.side_effect = None
+
+    def test_raises_on_exit(self):
+        try:
+            self.mock_write_api.write.side_effect = KeyboardInterrupt()
+            self.assertRaises(KeyboardInterrupt, self.logger.debug, self.fake_line_record)
+            self.mock_write_api.write.side_effect = SystemExit()
+            self.assertRaises(SystemExit, self.logger.debug, self.fake_line_record)
+        finally:
+            self.mock_write_api.write.side_effect = None
+
+    def test_can_set_bucket(self):
+        self.handler.bucket = "new-bucket"
+        self.logger.debug(self.fake_line_record)
+        self.mock_write_api.write.assert_called_once_with(bucket="new-bucket", record=self.fake_line_record)
+
+    def test_can_pass_bucket_on_log(self):
+        self.logger.debug(self.fake_line_record, extra={'bucket': "other-bucket"})
+        self.mock_write_api.write.assert_called_once_with(bucket="other-bucket", record=self.fake_line_record)
+
+    def test_can_pass_optional_params_on_log(self):
+        self.logger.debug(self.fake_line_record, extra={'org': "other-org", 'write_precision': WritePrecision.S,
+                                                        "arg3": 3, "arg2": "two"})
+        self.mock_write_api.write.assert_called_once_with(bucket="my-bucket", org='other-org',
+                                                          record=self.fake_line_record,
+                                                          write_precision=WritePrecision.S,
+                                                          arg3=3, arg2="two")
+
+    def test_formatter(self):
+        class MyFormatter(logging.Formatter):
+            def format(self, record: logging.LogRecord) -> str:
+                time_ns = int(record.created * 1e9) * 0 + 123
+                return f"{record.name},level={record.levelname} message=\"{record.msg}\" {time_ns}"
+
+        self.handler.setFormatter(MyFormatter())
+        msg = "a debug message"
+        self.logger.debug(msg)
+        expected_record = f"test-logger,level=DEBUG message=\"{msg}\" 123"
+        self.mock_write_api.write.assert_called_once_with(bucket="my-bucket", record=expected_record)
+
+
+if __name__ == "__main__":
+    unittest.main()