starlette-cramjam

Cramjam integration for Starlette ASGI framework.

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Source Code: https://github.com/developmentseed/starlette-cramjam

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The starlette-cramjam middleware aims to provide a unique Compression middleware to support Brotli, GZip and Deflate compression algorithms with a minimal requirement.

The middleware will compress responses for any request that includes "br", "gzip" or "deflate" in the Accept-Encoding header.

As for the official Starlette middleware, the one provided by starlette-cramjam will handle both standard and streaming responses.

stralette-cramjam is built on top of pyrus-cramjam an Extremely thin Python bindings to de/compression algorithms in Rust.

Installation

You can install starlette-cramjam from pypi

$ pip install -U pip
$ pip install starlette-cramjam

or install from source:

$ pip install -U pip
$ pip install https://github.com/developmentseed/starlette-cramjam.git

Usage

The following arguments are supported:

• compression (List of Compression) - List of available compression algorithm. This list also defines the order of preference. Defaults to [Compression.gzip, Compression.deflate, Compression.br],
• compression_level (Integer) - Compression level to use, form 0 (None) to 11 (High). Defaults to cramjam internal defaults for each compression backend.
• minimum_size (Integer) - Do not compress responses that are smaller than this minimum size in bytes. Defaults to 500.
• exclude_path (Set of string) - Do not compress responses in response to specific path requests. Entries have to be valid regex expressions. Defaults to {}.
• exclude_mediatype (Set of string) - Do not compress responses of specific media type (e.g image/png). Defaults to {}.

Minimal (defaults) example

import uvicorn

from starlette.applications import Starlette
from starlette.middleware import Middleware
from starlette.responses import PlainTextResponse
from starlette.routing import Route

from starlette_cramjam.middleware import CompressionMiddleware

def index(request):
    return PlainTextResponse("Hello World")


app = Starlette(
    routes=[Route("/", endpoint=index)],
    middleware=[
        Middleware(CompressionMiddleware),
    ],
)

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8000)

Using options

import uvicorn

from starlette.applications import Starlette
from starlette.middleware import Middleware
from starlette.responses import PlainTextResponse, Response
from starlette.routing import Route

from starlette_cramjam.compression import Compression
from starlette_cramjam.middleware import CompressionMiddleware

def index(request):
    return PlainTextResponse("Hello World")

def img(request):
    return Response(b"This is a fake body", status_code=200, media_type="image/jpeg")

def foo(request):
    return PlainTextResponse("Do not compress me.")


app = Starlette(
    routes=[
        Route("/", endpoint=index),
        Route("/image", endpoint=img),
        Route("/foo", endpoint=foo),
    ],
    middleware=[
        Middleware(
            CompressionMiddleware,
            compression=[Compression.gzip],  # Only support `gzip`
            compression_level=6,  # Compression level to use
            minimum_size=0,  # should compress everything
            exclude_path={"^/foo$"},  # do not compress response for the `/foo` request
            exclude_mediatype={"image/jpeg"},  # do not compress jpeg
        ),
    ],
)

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8000)

Performance

import gzip
import sys

import brotli
import cramjam
import httpx

page = httpx.get("https://github.com/developmentseed/starlette-cramjam").content

len(page)
# 347686

%timeit brotli.compress(page, quality=4)
# 1.77 ms ± 19.7 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)

sys.getsizeof(brotli.compress(page, quality=4))
# 48766

%timeit gzip.compress(page, compresslevel=6)
# 4.62 ms ± 28 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

sys.getsizeof(gzip.compress(page, compresslevel=6))
# 54888

# ------------
# With Cramjam
# ------------
%timeit cramjam.gzip.compress(page, level=6)
# 4.12 ms ± 57.3 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

cramjam.gzip.compress(page, level=6).len()
# 55221

%timeit cramjam.brotli.compress(page, level=4)
# 2.3 ms ± 48.5 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)

cramjam.brotli.compress(page, level=4).len()
# 48742

Ref: https://github.com/fullonic/brotli-asgi?tab=readme-ov-file#performance

Changes

See CHANGES.md.

Contribution & Development

See CONTRIBUTING.md

License

See LICENSE

Authors

Created by Development Seed

See contributors for a listing of individual contributors.