Arkflow(stream processing engine) will soon support Python processors

3 days ago 2

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"""

Walkthrough

A new Python-based processor plugin was integrated into the project. This involved adding the pyo3 dependency, creating a python processor module, updating the processor initialization logic, and providing an example YAML configuration to demonstrate usage of the new Python processor. Additionally, several dependencies in the arkflow-plugin Cargo.toml were switched from versioned crates to specific Git repository references with fixed commits. The Docker setup was updated to install Python packages, and a .dockerignore file was added.

Changes

File(s) Change Summary

crates/arkflow-plugin/Cargo.toml	Updated dependencies to Git repositories with fixed commits; added pyo3 with auto-initialize and serde features; upgraded object_store and hdfs-native-object-store.
crates/arkflow-plugin/src/processor/mod.rs	Declared new python submodule and updated init to initialize it.
crates/arkflow-plugin/src/processor/python.rs	Added Python processor implementation with async processing via embedded Python using PyO3.
examples/python_processor_example.yaml	Added example YAML config demonstrating the Python processor usage in a data pipeline.
Cargo.toml	Updated versions of datafusion, datafusion-functions-json, and arrow-json; removed MQTT and Kafka-related dependencies.
examples/python/example1.py	Added simple Python functions add(a, b) and process_batch(batch).
crates/arkflow-core/src/lib.rs	Added blank lines before trait implementation; no functional changes.
docker/Dockerfile	Added installation of python3 and python3-dev packages in build and runtime stages.
.dockerignore	Added .dockerignore file to exclude .git, .idea, target, and docs directories from Docker build context.

Sequence Diagram(s)

sequenceDiagram participant Pipeline participant ProcessorRegistry participant PythonProcessorBuilder participant PythonProcessor participant PythonInterpreter Pipeline->>ProcessorRegistry: Register "python" processor (init) Pipeline->>PythonProcessorBuilder: Build processor instance PythonProcessorBuilder->>PythonProcessor: Construct PythonProcessor Pipeline->>PythonProcessor: process(batch) PythonProcessor->>PythonInterpreter: Acquire GIL, setup sys.path, import module PythonProcessor->>PythonInterpreter: Execute optional script and call configured function PythonInterpreter-->>PythonProcessor: Return list of PyArrow record batches PythonProcessor->>Pipeline: Return processed MessageBatch list

Possibly related PRs

chore(deps): Switch ballista dependency from git version to specified version 46 #388: Switches ballista dependency between Git and versioned crates, modifying the same dependency as this PR but in opposite directions.
chore: datafusion-table-providers is replaced with standard crate #247: Changes datafusion-table-providers dependency between Git and versioned crates, directly related to this PR’s dependency modifications.
chore: change organization #204: Updates repository URLs for datafusion-table-providers dependencies, related to this PR’s dependency source changes.

Suggested labels

enhancement

Poem

🐇
A hop and a skip, now Python is here,
Rust shakes hands with snakes—no need to fear!
Base64 encoded, "Hello Rust!" in flight,
With YAML to guide us, everything’s right.
New code, new powers, what fun we’ll devise,
As bunnies and coders together, we rise!

"""

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