This library helps to process streaming data using Polars.

Installation

pip install polars-streaming

Install from sources

Alternatively, you can also clone the latest version from the repository and install it directly from the source code:

pip install -e .

Quick tour

Socket

>>> from polars_streaming import StreamProcessor

>>> s = StreamProcessor()
>>> s.readStream.format('socket').options({'host':'localhost','port':12345}).load()

>>> def transformation(df):
>>>     # Add your transformation code here
>>>     df = df.sum() # For example purpose, I am calculating the sum.
>>>     return df # Return the transformed dataframe

>>> s.add_transform(transformation)
>>> s.writeStream.format('console').trigger('3 seconds')

>>> s.start()

Kafka

>>> from polars_streaming import StreamProcessor

>>> s = StreamProcessor()
>>> s.readStream.format('kafka').options({'kafka.bootstrap.servers':'localhost','subscribe': 'topic_name',
                                          'startingOffsets': 'earliest',
                                          'kafka.group.id': 'g1'}).load()

>>> def transformation(df):
>>>     # Add your transformation code here
>>>     df = df.sum() # For example purpose, I am calculating the sum.
>>>     return df # Return the transformed dataframe

>>> s.add_transform(transformation)
>>> s.writeStream.format('console').trigger('10 seconds')

>>> s.start()

File Sources

>>> from polars_streaming import StreamProcessor

>>> s = StreamProcessor()
>>> s.readStream.format('csv').load('read_path_of_file_source') # Reads the csv file from the path once it is created

>>> def transformation(df):
>>>     # Add your transformation code here
>>>     df = df.sum() # For example purpose, I am calculating the sum.
>>>     return df # Return the transformed dataframe

>>> s.add_transform(transformation)
>>> s.writeStream.option('path','write_path').format('avro') # Write the processed data to the write path in avro format

>>> s.start()

Sources

• Socket
• File Sources
  • CSV
  • JSON
  • AVRO
  • PARQUET
• Kafka

Sinks

• Console
• File Sources
  • CSV
  • JSON
  • AVRO
  • PARQUET
• MongoDB
• ElasticSearch