KafPy

A Python Kafka library built with Rust and PyO3 for high-performance message consumption.

Overview

KafPy provides a handler-based API for building Kafka consumers in Python. It combines Rust's performance for the Kafka core with a clean Python interface for writing business logic.

Key capabilities:

Signal-driven offset commits with interval/batch throttle
Sync handlers (async not supported — raises TypeError)
Batch message processing via @app.batch_handler() decorator
Built-in retry and dead-letter queue (DLQ) support
Prometheus metrics and OTLP tracing
Middleware for logging, metrics, and custom extensions

Architecture

KafPy uses a Rust core for high-performance message ingestion with a Python API for handler logic.

flowchart LR
    K[Kafka] --> rdkafka[librdkafka]
    rdkafka --> RustConsumer[Rust Consumer]
    RustConsumer --> Dispatcher[Dispatcher]
    Dispatcher --> WorkerPool[Worker Pool]
    WorkerPool --> Handler[Python Handler]
    Handler --> Action[ack / nack / dlq / retry]

Key characteristics:

Rust core: Handles Kafka protocol, message batching, offset tracking, and worker threads
Python handlers: Execute in worker threads (GIL applies)
No async support: Async def handlers raise TypeError — use sync handlers

Quick Start

import kafpy

config = kafpy.ConsumerConfig(
    bootstrap_servers="localhost:9092",
    group_id="my-group",
    topics=["my-topic"],
)

consumer = kafpy.Consumer(config)
app = kafpy.KafPy(consumer)

@app.handler(topic="my-topic")
def handle(msg: kafpy.KafkaMessage, ctx: kafpy.HandlerContext) -> kafpy.HandlerResult:
    print(f"Received: {msg.key} @ {ctx.topic}:{ctx.partition}:{ctx.offset}")
    return kafpy.HandlerResult(action="ack")

app.start()

Installation

Prerequisites

Python 3.11+
Rust toolchain
librdkafka

Install librdkafka before building:

# macOS
brew install librdkafka

# Ubuntu / Debian
apt install librdkafka-dev

# Fedora
dnf install librdkafka-devel

From PyPI

pip install kafpy

From source

git clone https://github.com/DVNghiem/KafPy.git
cd KafPy
pip install maturin
maturin develop --release

Full Documentation

Detailed guides and API reference are available at the KafPy documentation site.

Guide	Description
Getting Started	Build your first Kafka consumer
Configuration	Consumer and retry configuration
Handlers	Writing sync and batch handlers
Error Handling	Retry, DLQ, and timeout strategies
API Reference	Full API documentation

License

BSD-3-Clause. See LICENSE.

Metadata

Release files for kafpy 0.1.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for kafpy 0.1.0
File	Size	Uploaded
kafpy-0.1.0.tar.gz	187.4 kB	May 25, 2026	Details

Built distributions (wheels)

Table of built distributions (wheels) for kafpy 0.1.0
File	Interpreter	ABI	Platform	Reset
kafpy-0.1.0-cp314-cp314-win_amd64.whl 1.6 MB May 25, 2026	CPython 3.14	CPython 3.14	Windows x86-64	Details
kafpy-0.1.0-cp314-cp314-musllinux_1_2_x86_64.whl 1.6 MB May 25, 2026	CPython 3.14	CPython 3.14	Linux musl 1.2+ x86-64	Details
kafpy-0.1.0-cp314-cp314-musllinux_1_2_aarch64.whl 1.5 MB May 25, 2026	CPython 3.14	CPython 3.14	Linux musl 1.2+ ARM64	Details
kafpy-0.1.0-cp314-cp314-manylinux_2_28_x86_64.whl 1.4 MB May 25, 2026	CPython 3.14	CPython 3.14	Linux glibc 2.28+ x86-64	Details
kafpy-0.1.0-cp314-cp314-manylinux_2_28_aarch64.whl 1.3 MB May 25, 2026	CPython 3.14	CPython 3.14	Linux glibc 2.28+ ARM64	Details
kafpy-0.1.0-cp314-cp314-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl 2.3 MB May 25, 2026	CPython 3.14	CPython 3.14	macOS 11.0+ ARM64, macOS 10.12+ universal2 (ARM64, x86-64), macOS 10.12+ x86-64	Details
kafpy-0.1.0-cp313-cp313-win_amd64.whl 1.6 MB May 25, 2026	CPython 3.13	CPython 3.13	Windows x86-64	Details
kafpy-0.1.0-cp313-cp313-musllinux_1_2_x86_64.whl 1.6 MB May 25, 2026	CPython 3.13	CPython 3.13	Linux musl 1.2+ x86-64	Details
kafpy-0.1.0-cp313-cp313-musllinux_1_2_aarch64.whl 1.5 MB May 25, 2026	CPython 3.13	CPython 3.13	Linux musl 1.2+ ARM64	Details
kafpy-0.1.0-cp313-cp313-manylinux_2_28_x86_64.whl 1.4 MB May 25, 2026	CPython 3.13	CPython 3.13	Linux glibc 2.28+ x86-64	Details
kafpy-0.1.0-cp313-cp313-manylinux_2_28_aarch64.whl 1.3 MB May 25, 2026	CPython 3.13	CPython 3.13	Linux glibc 2.28+ ARM64	Details
kafpy-0.1.0-cp313-cp313-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl 2.3 MB May 25, 2026	CPython 3.13	CPython 3.13	macOS 10.12+ universal2 (ARM64, x86-64), macOS 11.0+ ARM64, macOS 10.12+ x86-64	Details
kafpy-0.1.0-cp312-cp312-win_amd64.whl 1.6 MB May 25, 2026	CPython 3.12	CPython 3.12	Windows x86-64	Details
kafpy-0.1.0-cp312-cp312-musllinux_1_2_x86_64.whl 1.6 MB May 25, 2026	CPython 3.12	CPython 3.12	Linux musl 1.2+ x86-64	Details
kafpy-0.1.0-cp312-cp312-musllinux_1_2_aarch64.whl 1.5 MB May 25, 2026	CPython 3.12	CPython 3.12	Linux musl 1.2+ ARM64	Details
kafpy-0.1.0-cp312-cp312-manylinux_2_28_x86_64.whl 1.4 MB May 25, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.28+ x86-64	Details
kafpy-0.1.0-cp312-cp312-manylinux_2_28_aarch64.whl 1.3 MB May 25, 2026	CPython 3.12	CPython 3.12	Linux glibc 2.28+ ARM64	Details
kafpy-0.1.0-cp312-cp312-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl 2.3 MB May 25, 2026	CPython 3.12	CPython 3.12	macOS 11.0+ ARM64, macOS 10.12+ x86-64, macOS 10.12+ universal2 (ARM64, x86-64)	Details
kafpy-0.1.0-cp311-cp311-win_amd64.whl 1.6 MB May 25, 2026	CPython 3.11	CPython 3.11	Windows x86-64	Details
kafpy-0.1.0-cp311-cp311-musllinux_1_2_x86_64.whl 1.6 MB May 25, 2026	CPython 3.11	CPython 3.11	Linux musl 1.2+ x86-64	Details
kafpy-0.1.0-cp311-cp311-musllinux_1_2_aarch64.whl 1.5 MB May 25, 2026	CPython 3.11	CPython 3.11	Linux musl 1.2+ ARM64	Details
kafpy-0.1.0-cp311-cp311-manylinux_2_28_x86_64.whl 1.4 MB May 25, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.28+ x86-64	Details
kafpy-0.1.0-cp311-cp311-manylinux_2_28_aarch64.whl 1.3 MB May 25, 2026	CPython 3.11	CPython 3.11	Linux glibc 2.28+ ARM64	Details
kafpy-0.1.0-cp311-cp311-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl 2.3 MB May 25, 2026	CPython 3.11	CPython 3.11	macOS 10.12+ universal2 (ARM64, x86-64), macOS 11.0+ ARM64, macOS 10.12+ x86-64	Details

Total release size: 39.5 MB

Release files / kafpy-0.1.0.tar.gz

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Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Publishing platform: GitHub Actions
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Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Release files / kafpy-0.1.0-cp313-cp313-manylinux_2_28_aarch64.whl

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Publishing platform: GitHub Actions
Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Release files / kafpy-0.1.0-cp313-cp313-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl

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Publishing platform: GitHub Actions
Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Release files / kafpy-0.1.0-cp312-cp312-win_amd64.whl

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Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Release files / kafpy-0.1.0-cp312-cp312-musllinux_1_2_x86_64.whl

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Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Release files / kafpy-0.1.0-cp312-cp312-manylinux_2_28_x86_64.whl

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Publishing platform: GitHub Actions
Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Release files / kafpy-0.1.0-cp312-cp312-manylinux_2_28_aarch64.whl

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Publishing platform: GitHub Actions
Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Release files / kafpy-0.1.0-cp312-cp312-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl

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Uploaded via	`twine/6.1.0 CPython/3.13.12`

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Publishing platform: GitHub Actions
Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Release files / kafpy-0.1.0-cp311-cp311-win_amd64.whl

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Uploaded via	`twine/6.1.0 CPython/3.13.12`

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Publishing platform: GitHub Actions
Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Release files / kafpy-0.1.0-cp311-cp311-musllinux_1_2_x86_64.whl

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Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

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Publishing platform: GitHub Actions
Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Release files / kafpy-0.1.0-cp311-cp311-musllinux_1_2_aarch64.whl

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Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

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Publishing platform: GitHub Actions
Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Release files / kafpy-0.1.0-cp311-cp311-manylinux_2_28_x86_64.whl

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Upload date	May 25, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

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Publishing platform: GitHub Actions
Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Release files / kafpy-0.1.0-cp311-cp311-manylinux_2_28_aarch64.whl

Download URL	kafpy-0.1.0-cp311-cp311-manylinux_2_28_aarch64.whl
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Upload date	May 25, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

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Publishing platform: GitHub Actions
Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Publishing configuration: github.com/DVNghiem/KafPy/blob/ef5ffdf2d6f764005a3795a804407762876c7fac/.github/workflows/release.yml
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Release files / kafpy-0.1.0-cp311-cp311-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl

Download URL	kafpy-0.1.0-cp311-cp311-macosx_10_12_x86_64.macosx_11_0_arm64.macosx_10_12_universal2.whl
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Upload date	May 25, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	Yes
Uploaded via	`twine/6.1.0 CPython/3.13.12`

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Publishing platform: GitHub Actions
Publishing repository: github.com/DVNghiem/KafPy
Publishing commit: github.com/DVNghiem/KafPy/tree/ef5ffdf2d6f764005a3795a804407762876c7fac

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Publishing configuration: github.com/DVNghiem/KafPy/blob/ef5ffdf2d6f764005a3795a804407762876c7fac/.github/workflows/release.yml
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SHA-256 checksum: 564c9f1f481e8a1435f74097b55ccc28ab2544128a072c06d49b3b01229fd914 Verifying attestations

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This release

0.1.0 This release

May 25, 2026 25 release files

kafpy 0.1.0

KafPy

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