eggress Python bindings

Python bindings for the eggress proxy framework, powered by PyO3 and the Rust embed API.

Installation (local development)

pip install maturin
cd crates/eggress-python
rm -f ../../target/wheels/eggress-*.whl   # stale wheels break the install glob below
maturin build --target x86_64-apple-darwin   # adjust target for your platform
pip install --force-reinstall target/wheels/eggress-*.whl

Prebuilt wheels

Prebuilt wheels are published to PyPI for:

Linux x86_64 and aarch64 (manylinux)
macOS x86_64 and arm64
Windows x86_64

The wheel uses the Python stable ABI (abi3-py39), so one wheel per platform supports all declared Python versions (3.9–3.13). Other platforms can install from the source distribution (requires Rust toolchain).

Supported Python versions: 3.9, 3.10, 3.11, 3.12, 3.13.

Quick start

from eggress import EggressService

with EggressService.from_toml("""
    version = 1
    [[listeners]]
    name = "socks"
    bind = "127.0.0.1:0"
    protocols = ["socks5"]
""").start() as handle:
    addr = handle.bound_addresses["socks"]
    print(f"SOCKS5 listening on {addr}")
    print(handle.metrics_text())

Async usage

import asyncio
from eggress import EggressService

async def main():
    async with await EggressService.from_toml(TOML).astart() as handle:
        print("Listening on", await handle.bound_addresses)

asyncio.run(main())

API

EggressConfig.from_toml(toml) / EggressConfig.from_file(path) — parse config
EggressService(config) / EggressService.from_toml(toml) — create service
service.start() — start proxy, returns EggressHandle
handle.bound_addresses — dict of listener name -> address
handle.status() — generation, readiness, uptime, connections
handle.metrics_text() — Prometheus metrics
handle.reload_toml(toml) — hot-reload config
handle.shutdown() — graceful shutdown (idempotent; safe to call twice)
Context manager support: with service.start() as handle: ...

Always use explicit lifecycle management. Prefer context managers or explicit handle.shutdown() in a finally block. Do not rely on Python garbage collection to shut down the service — object destruction is a best-effort fallback, not the lifecycle API.

pproxy Compatibility

Eggress provides a pproxy compatibility surface validated against pproxy==2.7.9 and bounded by the canonical capability manifest. Legacy cipher implementations and unsupported native transports fail explicitly rather than being silently substituted:

URI Translation: translate_pproxy_args() converts pproxy CLI arguments to eggress TOML
Same Protocols: HTTP, SOCKS4/4a, SOCKS5, Shadowsocks (AEAD), Trojan
Same Schedulers: Round-robin, least-connections, first-available
Enhanced Features: Hot-reload, structured errors, context managers

See docs/python/PPROXY_EMBEDDED_USAGE_PATTERNS.md for migration guidance.

pproxy drop-in API

from eggress import PPProxyService, start_pproxy, check_pproxy_args

# Check compatibility before starting
report = check_pproxy_args(["-l", "socks5://:1080", "-r", "http://proxy:8080"])
print(f"Tier: {report.tier}, OK: {report.ok}")

# Start from pproxy args
with start_pproxy(["-l", "socks5://127.0.0.1:0"]) as handle:
    print(handle.bound_addresses)

# Start from local URI
with PPProxyService.from_uri("socks5://127.0.0.1:0") as handle:
    print(handle.bound_addresses)

# Start from TOML
with PPProxyService.from_toml(toml_str) as handle:
    print(handle.bound_addresses)

The optional eggress-pproxy-compat distribution additionally provides python -m pproxy, a pproxy console script, and the top-level pproxy package backed by the same compatibility entry point. pproxy.server helper calls reuse the existing protocol/proxy adapters, while pproxy.sysproxy delegates system-proxy apply/rollback to the native backend where the platform supports it. See the namespace strategy below before installing it.

API Contract (Phase C1)

A machine-readable contract of the bounded pproxy adapter is maintained at python/compat/pproxy_api_contract.json. The exact upstream installed-package inventory is maintained separately in compat/pproxy-2.7.9/namespace-baseline.json and the active parity manifest. Use scripts/pproxy_surface_probe.py with isolated oracle and wheel interpreters to compare module names, top-level exports, tracked signatures, async classification, and class bases. Importability is not a claim that private pproxy internals are functionally reproduced.

Classification summary

Tier	Count	Examples
adapted_target	3	Connection, Server, Rule → PPProxyService
intentional_non_parity	1	DIRECT sentinel
internal_observed	87	Protocol classes, cipher classes, server internals

Validation

# Regenerate the contract
python3.11 python/compat/extract_api.py

# Run 56 contract validation tests
python3.11 -m pytest tests/compat/test_pproxy_api_contract.py -v

# Run 46 behavioral probes
python3.11 python/compat/behavioral_probes.py

Namespace strategy

The optional eggress-pproxy-compat distribution installs a bounded top-level pproxy package containing the documented connection/server factories and protocol/cipher submodules. The canonical eggress distribution retains eggress.pproxy and eggress.start_pproxy() for translation and managed-service workflows. Do not install the compatibility distribution alongside upstream pproxy in the same environment. See docs/python/PPROXY_NAMESPACE_STRATEGY.md for the compatibility boundary.

Migrating from pproxy

from eggress import start_pproxy

# Same arguments you'd pass to pproxy
with start_pproxy(["-l", "socks5://:1080", "-r", "http://proxy:8080"]) as handle:
    print(handle.bound_addresses)

Or inspect the translation first:

from eggress import translate_pproxy_args

result = translate_pproxy_args(["-l", "socks5://:1080", "-r", "http://proxy:8080"])
print(result.toml)         # generated eggress TOML
print(result.warnings)     # partial-behavior notes
print(result.unsupported)  # unsupported features

Error model

Exception	Meaning
`EggressError`	Base exception
`ConfigError`	TOML parsing or validation error
`StartupError`	Listener bind or readiness timeout
`ReloadError`	Config reload failure
`ShutdownError`	Runtime shutdown error
`UnsupportedFeatureError`	Feature not supported
`InternalError`	Unexpected internal error

Limitations

GIL is released for blocking Rust calls
Requires Python >= 3.9
Listener bind changes require restart (not reloadable)
No logging initialization unless configured in TOML

Non-parity with pproxy

Shadowsocks TCP uses standard SIP003 AEAD framing (wire-compatible with shadowsocks-rust/ssserver/sslocal); single-hop upstream only
No inbound Shadowsocks or Trojan listeners (upstream-only) — inbound Shadowsocks listener is available in the Rust binary; Python bindings expose the embed API which omits this for now
No legacy stream ciphers (aes-ctr, aes-cfb, rc4-md5, etc.)
No SSH, Unix socket, or transparent proxy (redir) transport
No pproxy daemon mode (--daemon)
No -ul/-ur standalone UDP relay (uses SOCKS5 UDP ASSOCIATE)
Multiple remotes default to round-robin (matches pproxy behavior)
Direct fallback requires explicit config

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1.0.6

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This release

1.0.5 This release

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1.0.1

Jul 29, 2026 1 file

eggress 1.0.5

eggress Python bindings

Installation (local development)

Prebuilt wheels

Quick start

Async usage

API

pproxy Compatibility

pproxy drop-in API

API Contract (Phase C1)

Classification summary

Validation

Namespace strategy

Migrating from pproxy

Error model

Limitations

Non-parity with pproxy

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