Developer centric, performant and extensible Python ASGI framework

Last update: Dec 27, 2022

Overview

Introduction

xpresso is an ASGI web framework built on top of Starlette, Pydantic and di, with heavy inspiration from FastAPI.

Some of the standout features are:

ASGI support for high performance (within the context of Python web frameworks)
OpenAPI documentation generation
Automatic parsing and validation of request bodies and parameters, with hooks for custom extractors
Full support for OpenAPI parameter serialization
Highly typed and tested codebase with great IDE support
A powerful dependency injection system, backed by di

Requirements

Python 3.7+

Installation

pip install xpresso

You'll also want to install an ASGI server, such as Uvicorn.

pip install uvicorn

Example

Create a file named example.py:

from pydantic import BaseModel
from xpresso import App, Path, FromPath, FromQuery

class Item(BaseModel):
    item_id: int
    name: str

async def read_item(item_id: FromPath[int], name: FromQuery[str]) -> Item:
    return Item(item_id=item_id, name=name)

app = App(
    routes=[
        Path(
            "/items/{item_id}",
            get=read_item,
        )
    ]
)

Run the application:

uvicorn example:app

Navigate to http://127.0.0.1:8000/items/123?name=foobarbaz in your browser. You will get the following JSON response:

{"item_id":123,"name":"foobarbaz"}

Now navigate to http://127.0.0.1:8000/docs to poke around the interactive Swagger UI documentation:

For more examples, tutorials and reference materials, see our documentation.

Comments

Pip can't resolve dependencies
I'm having some trouble installing the following from a requirements file:

jinja2 piccolo[postgres] piccolo_admin xpresso uvicorn

Pip can't resolve the dependencies and gets caught in an endless loop.

It only started today - I noticed because the CI started failing. I can't see anything in the latest Xpresso release which may have caused this.

Do you have any ideas?
opened by dantownsend 10
Cannot import name 'DependantBase' from 'di.api.dependencies'
I'm getting this error when running Xpresso:

from di.api.dependencies import DependantBase ImportError: cannot import name 'DependantBase' from 'di.api.dependencies'

I see you renamed something in di recently. How about putting something like this for backwards compatibility:

DependantBase = DependentBase
opened by dantownsend 6
feat/refactor!: router-level middleware, support for lifespans on mounted apps

Closes #32

This is a middle road of where we are now and #32: App is not longer based on Starlette, but Router still inherits from Starlette's Router and adds middleware on top of it

opened by adriangb 6
chore(dev): Improve low Code and Refactor Functions
Hello @adriangb It's been a long time we talk about the projects, I just find the right time to do some improvement in code may be related to styling and improving code to use the last Pythonic ways, that's why!

I guess you will find most of the refactor functions are:

Simplifies boolean if expressions by removing unnecessary explicit references to True or False states.

Replaces conditional assignment to a variable with an if expression

And other ones, also sorry for this Big Pull request 😅
opened by yezz123 4
feat: add @Router.get, @Router.put, etc. decorators to Router
Background: https://github.com/encode/starlette/pull/704

There are pros and cons to the decorator / list of routes approach. I think the big pro of the decorator approach is having the path parameters close to the endpoint function. The main con is that it introduces a lot of code paths, for example with App.add_middleware() and the relationship between App and App.router.

A good compromise may be to add decorators only for Path. This gives us the best of both worlds:

Path parameter declarations are close to where they are used

There is no complicated state management (Path is pretty simple)

Other classes are boilerplate free and have simple declarative constructor composability

The main issue is how to deal with Operation. I guess we'd have to make the decorators accept all of the parameters of Operation, which I don't like.
opened by adriangb 3
feat: add App.dependency_overrides

App.dependency_overrides can be used as a mapping or context manager that yields a mapping

This reduces a lot of boilerplate for users by wrapping their callable in Depends for them and shortening the function calls. It also acts as an ExitStack: users can assign overrides without increasing indentation and they all get unwound when the underlaying context manager exits.

opened by adriangb 2
bug: repeated vs comma separated array headers

As per specs, these should be treated as equivalent. But I believe we are only dealing with the latter right now. It might make sense to double check what the ASGI spec, the HTTP specs, the OpenAPI spec, requests/TesClient and finally Starlette have to say about the matter and then fix the issue (if there is one)

opened by adriangb 2
chore(deps): bump certifi from 2022.9.24 to 2022.12.7
Bumps certifi from 2022.9.24 to 2022.12.7.

Commits

9e9e840 2022.12.07

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dependencies
opened by dependabot[bot] 1
chore(deps-dev): bump httpx from 0.18.1 to 0.23.0
Bumps httpx from 0.18.1 to 0.23.0.

Release notes

Sourced from httpx's releases.

Version 0.23.0

0.23.0 (23rd May, 2022)

Changed

Drop support for Python 3.6. (#2097)

Use utf-8 as the default character set, instead of falling back to charset-normalizer for auto-detection. To enable automatic character set detection, see the documentation. (#2165)

Fixed

Fix URL.copy_with for some oddly formed URL cases. (#2185)

Digest authentication should use case-insensitive comparison for determining which algorithm is being used. (#2204)

Fix console markup escaping in command line client. (#1866)

When files are used in multipart upload, ensure we always seek to the start of the file. (#2065)

Ensure that iter_bytes never yields zero-length chunks. (#2068)

Preserve Authorization header for redirects that are to the same origin, but are an http-to-https upgrade. (#2074)

When responses have binary output, don't print the output to the console in the command line client. Use output like <16086 bytes of binary data> instead. (#2076)

Fix display of --proxies argument in the command line client help. (#2125)

Close responses when task cancellations occur during stream reading. (#2156)

Fix type error on accessing .request on HTTPError exceptions. (#2158)

Version 0.22.0

0.22.0 (26th January, 2022)

Added

Support for the SOCKS5 proxy protocol via the socksio package. (#2034)

Support for custom headers in multipart/form-data requests (#1936)

Fixed

Don't perform unreliable close/warning on __del__ with unclosed clients. (#2026)

Fix Headers.update(...) to correctly handle repeated headers (#2038)

Version 0.21.3

0.21.3 (6th January, 2022)

Fixed

Fix streaming uploads using SyncByteStream or AsyncByteStream. Regression in 0.21.2. (#2016)

Version 0.21.2

0.21.2 (5th January, 2022)

Fixed

HTTP/2 support for tunnelled proxy cases. (#2009)

Improved the speed of large file uploads. (#1948)

Version 0.21.1

... (truncated)

Changelog

Sourced from httpx's changelog.

0.23.0 (23rd May, 2022)

Changed

Drop support for Python 3.6. (#2097)

Use utf-8 as the default character set, instead of falling back to charset-normalizer for auto-detection. To enable automatic character set detection, see the documentation. (#2165)

Fixed

Fix URL.copy_with for some oddly formed URL cases. (#2185)

Digest authentication should use case-insensitive comparison for determining which algorithm is being used. (#2204)

Fix console markup escaping in command line client. (#1866)

When files are used in multipart upload, ensure we always seek to the start of the file. (#2065)

Ensure that iter_bytes never yields zero-length chunks. (#2068)

Preserve Authorization header for redirects that are to the same origin, but are an http-to-https upgrade. (#2074)

When responses have binary output, don't print the output to the console in the command line client. Use output like <16086 bytes of binary data> instead. (#2076)

Fix display of --proxies argument in the command line client help. (#2125)

Close responses when task cancellations occur during stream reading. (#2156)

Fix type error on accessing .request on HTTPError exceptions. (#2158)

0.22.0 (26th January, 2022)

Added

Support for the SOCKS5 proxy protocol via the socksio package. (#2034)

Support for custom headers in multipart/form-data requests (#1936)

Fixed

Don't perform unreliable close/warning on __del__ with unclosed clients. (#2026)

Fix Headers.update(...) to correctly handle repeated headers (#2038)

0.21.3 (6th January, 2022)

Fixed

Fix streaming uploads using SyncByteStream or AsyncByteStream. Regression in 0.21.2. (#2016)

0.21.2 (5th January, 2022)

Fixed

HTTP/2 support for tunnelled proxy cases. (#2009)

Improved the speed of large file uploads. (#1948)

0.21.1 (16th November, 2021)

Fixed

The response.url property is now correctly annotated as URL, instead of Optional[URL]. (#1940)

... (truncated)

Commits

89cdd90 Version 0.23.0 (#2214)

1c33a28 Make charset auto-detection optional. (#2165)

940d61b Removed curio from async.md (#2240)

14a1704 Switch to explicit typing.Optional throughout (#2096)

9673a35 Drop async_generator requirement (#2228)

5eba32a Remove RequestBodyUnavailable from module docstring (#2226)

6f31bc4 Bump mkdocs-material from 8.1.4 to 8.2.14 (#2218)

c5eb4b8 Bump cryptography from 36.0.2 to 37.0.2 (#2217)

1a526cf Bump actions/checkout from 2 to 3 (#2216)

7a53543 Bump actions/setup-python from 1 to 3 (#2215)

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dependencies
opened by dependabot[bot] 1
refactor!: change binder API to modify OpenAPI schema in place

This paves the path for more OpenAPI generation (security models and such) without bloating the API, at the cost of shifting some responsibilies to each implementer instead of centralizing them in the OpenAPI generation infra

opened by adriangb 1
chore: simplify binder APIs by dropping support for generic field extractors

BREAKING_CHANGE: removed ExtractField and ExtractRepeatedField. Extracting JSON from a form field is no longer supported. Changes to generated OpenAPI.

I think proving out the idea of very generic extractors (e.g.FromRepeatedFormField[FromJson[Model]]) was interesting. It also helped shape some APIs. But I don't think this is a feature I would use all that often, and so I would prefer to get some real world use cases form users before exposing these sorts of APIs. We can add these APIs in the future, but we can't remove them (without breaking changes).

Removing this functionality (and refactoring the binder APIs and implementations) we can arrive at a much simpler system (2 interfaces / ~2 functions to implement the binder API), and reduce the package's codebase by ~15%.

There's a lot more cleanup that needs to be done with tests after this (e.g. coverage for the file extractor); that will be done in subsequent changes.

opened by adriangb 1
chore(deps): bump setuptools from 65.4.1 to 65.5.1
Bumps setuptools from 65.4.1 to 65.5.1.

Changelog

Sourced from setuptools's changelog.

v65.5.1

Misc ^^^^

#3638: Drop a test dependency on the mock package, always use :external+python:py:mod:unittest.mock -- by :user:hroncok

#3659: Fixed REDoS vector in package_index.

v65.5.0

Changes ^^^^^^^

#3624: Fixed editable install for multi-module/no-package src-layout projects.

#3626: Minor refactorings to support distutils using stdlib logging module.

Documentation changes ^^^^^^^^^^^^^^^^^^^^^

#3419: Updated the example version numbers to be compliant with PEP-440 on the "Specifying Your Project’s Version" page of the user guide.

Misc ^^^^

#3569: Improved information about conflicting entries in the current working directory and editable install (in documentation and as an informational warning).

#3576: Updated version of validate_pyproject.

Commits

a462cb5 Bump version: 65.5.0 → 65.5.1

de35d8b Merge pull request #3656 from bmorris3/typos

58e23de Update changelog. Ref #3659.

43a9c9b Limit the amount of whitespace to search/backtrack. Fixes #3659.

5791343 Add test capturing failed expectation. Ref #3659.

1f97905 ⚫ Fade to black.

6254567 Remove workaround for emacs.

729b180 ⚫ Fade to black.

c068081 Typo corrections

f777a40 Suppress deprecation warning in --rsyncdir. Workaround for #3655.

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dependencies
opened by dependabot[bot] 0
Make response scraping from return values pluggable

https://github.com/adriangb/xpresso/pull/106#discussion_r968491622

While it is currently possible to use a combination of the reponse_factory parameter to Operation and explicitly setting the response schema via the responses parameter to Operation to support non-Pydantic responses, it is super boilerplatey and cumbersome.

opened by adriangb 1
doc: binder example for msgspec

cc @jcrist

I'm not covering a bunch of edge cases and additional features (empty bodies, include_in_schema=False, descriptions, etc.) nor am I covering doing the same thing for query/path/etc. params. I think it would be interesting as a 3rd party package though!

opened by adriangb 3
Add section to the docs about ecosystem / ASGI integration?

I know it's still early days for Xpresso, but how about an ecosystem page in the docs?

I know Piccolo is compatible, and there's bound to be other generic ASGI middleware etc which is known to work.

Just an idea.

opened by dantownsend 1
POC for security classes using Protocol

This uses Protocols to create "template classes": classes that give you errors if you don't implement all of the required class variables.

This at least allows some typechecking of missing parameters and wrongly typed parameters

opened by adriangb 1

Releases(0.46.0)

0.46.0(Dec 21, 2022)
What's Changed

fix: rename things to match di>=0.73.0 and pin di by @adriangb in https://github.com/adriangb/xpresso/pull/112

chore: fix ci by removing httptools (doesn't build 3.11 wheels) by @adriangb in https://github.com/adriangb/xpresso/pull/113

fix: bump minimum Pydantic version for compatibility with 3.11 by @adriangb in https://github.com/adriangb/xpresso/pull/114

feat!: rename FromFile and File to FromRawBody and RawBody by @adriangb in https://github.com/adriangb/xpresso/pull/117

Full Changelog: https://github.com/adriangb/xpresso/compare/0.44.1...0.46.0
Source code(tar.gz)
Source code(zip)
0.44.1(Oct 6, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.44.0...0.44.1
Source code(tar.gz)
Source code(zip)
0.44.0(Oct 6, 2022)
What's Changed

Update Starlette to >=0.21.0 by @adriangb in https://github.com/adriangb/xpresso/pull/108

Full Changelog: https://github.com/adriangb/xpresso/compare/0.43.0...0.44.0
Source code(tar.gz)
Source code(zip)
0.43.0(Oct 5, 2022)
What's Changed

Pin importlib-metadata by @adriangb in https://github.com/adriangb/xpresso/pull/110

don't run sync dependencies in threads by default by @adriangb in https://github.com/adriangb/xpresso/pull/109

Full Changelog: https://github.com/adriangb/xpresso/compare/0.42.3...0.43.0
Source code(tar.gz)
Source code(zip)
0.42.3(Sep 12, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.42.2...0.42.3
Source code(tar.gz)
Source code(zip)
0.42.2(Sep 12, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.42.1...0.42.2
Source code(tar.gz)
Source code(zip)
0.42.1(Sep 9, 2022)
What's Changed

fix minor typo in docs included -> include by @dantownsend in https://github.com/adriangb/xpresso/pull/102

chore: fix nightly tests by @adriangb in https://github.com/adriangb/xpresso/pull/105

doc: update examples to reflect dependency scope inference by @adriangb in https://github.com/adriangb/xpresso/pull/104

Full Changelog: https://github.com/adriangb/xpresso/compare/0.42.0...0.42.1
Source code(tar.gz)
Source code(zip)
0.42.0(Aug 8, 2022)
What's Changed

Incorporate scope inference by @adriangb in https://github.com/adriangb/xpresso/pull/101

Full Changelog: https://github.com/adriangb/xpresso/compare/0.41.2...0.42.0
Source code(tar.gz)
Source code(zip)
0.41.2(Aug 3, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.41.1...0.41.2
Source code(tar.gz)
Source code(zip)
0.41.1(Jun 2, 2022)
What's Changed

chore: update lockfile by @adriangb in https://github.com/adriangb/xpresso/pull/98

chore(deps-dev): bump httpx from 0.18.1 to 0.23.0 by @dependabot in https://github.com/adriangb/xpresso/pull/99

fix: compatibility with pydantic master branch by @adriangb in https://github.com/adriangb/xpresso/pull/100

New Contributors

@dependabot made their first contribution in https://github.com/adriangb/xpresso/pull/99

Full Changelog: https://github.com/adriangb/xpresso/compare/0.41.0...0.41.1
Source code(tar.gz)
Source code(zip)
0.41.0(Apr 27, 2022)
What's Changed

feat: support context managers for extractors by @adriangb in https://github.com/adriangb/xpresso/pull/95

Full Changelog: https://github.com/adriangb/xpresso/compare/0.40.0...0.41.0
Source code(tar.gz)
Source code(zip)
0.40.0(Apr 22, 2022)
What's Changed

refactor!: change binder API to modify OpenAPI schema in place by @adriangb in https://github.com/adriangb/xpresso/pull/94

Full Changelog: https://github.com/adriangb/xpresso/compare/0.39.0...0.40.0
Source code(tar.gz)
Source code(zip)
0.39.0(Apr 22, 2022)
What's Changed

Update query_params.py by @Kludex in https://github.com/adriangb/xpresso/pull/92

feat: allow binding of dependencies from within lifespans by @adriangb in https://github.com/adriangb/xpresso/pull/93

New Contributors

@Kludex made their first contribution in https://github.com/adriangb/xpresso/pull/92

Full Changelog: https://github.com/adriangb/xpresso/compare/0.38.3...0.39.0
Source code(tar.gz)
Source code(zip)
0.38.3(Apr 18, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.38.2...0.38.3
Source code(tar.gz)
Source code(zip)
0.38.2(Apr 15, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.38.1...0.38.2
Source code(tar.gz)
Source code(zip)
0.38.1(Apr 15, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.38.0...0.38.1
Source code(tar.gz)
Source code(zip)
0.38.0(Apr 3, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.37.0...0.38.0
Source code(tar.gz)
Source code(zip)
0.37.0(Apr 2, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.35.0...0.37.0
Source code(tar.gz)
Source code(zip)
0.35.0(Apr 2, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.34.1...0.35.0
Source code(tar.gz)
Source code(zip)
0.34.1(Mar 28, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.34.0...0.34.1
Source code(tar.gz)
Source code(zip)
0.34.0(Mar 26, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.33.0...0.34.0
Source code(tar.gz)
Source code(zip)
0.33.0(Mar 25, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.32.0...0.33.0
Source code(tar.gz)
Source code(zip)
0.32.0(Mar 24, 2022)
What's Changed

chore: simplify binder APIs by dropping support for generic field extractors by @adriangb in https://github.com/adriangb/xpresso/pull/90

Full Changelog: https://github.com/adriangb/xpresso/compare/0.31.1...0.32.0
Source code(tar.gz)
Source code(zip)
0.31.1(Mar 17, 2022)

Full Changelog: https://github.com/adriangb/xpresso/compare/0.31.0...0.31.1
Source code(tar.gz)
Source code(zip)
0.31.0(Mar 17, 2022)
What's Changed

feat: handle merging of response specs by @adriangb in https://github.com/adriangb/xpresso/pull/89

Full Changelog: https://github.com/adriangb/xpresso/compare/0.30.0...0.31.0
Source code(tar.gz)
Source code(zip)
0.30.0(Mar 16, 2022)
What's Changed

fix!: rename Config -> BaseConfig to avoid name collisions with pydantic.BaseSettings.Config by @adriangb in https://github.com/adriangb/xpresso/pull/88

Full Changelog: https://github.com/adriangb/xpresso/compare/0.29.0...0.30.0
Source code(tar.gz)
Source code(zip)
0.29.0(Mar 13, 2022)
What's Changed

feat: accept files as streams by @adriangb in https://github.com/adriangb/xpresso/pull/87

Full Changelog: https://github.com/adriangb/xpresso/compare/0.28.3...0.29.0
Source code(tar.gz)
Source code(zip)
0.28.3(Mar 12, 2022)
What's Changed

chore: cleanup Operation and Path by @adriangb in https://github.com/adriangb/xpresso/pull/86

Full Changelog: https://github.com/adriangb/xpresso/compare/0.28.2...0.28.3
Source code(tar.gz)
Source code(zip)
0.28.2(Mar 11, 2022)
What's Changed

fix: support starlette>=0.17.1 by @adriangb in https://github.com/adriangb/xpresso/pull/85

Full Changelog: https://github.com/adriangb/xpresso/compare/0.28.1...0.28.2
Source code(tar.gz)
Source code(zip)
0.28.1(Mar 11, 2022)
What's Changed

chore: remove importlib-metadata dependency by @adriangb in https://github.com/adriangb/xpresso/pull/84

Full Changelog: https://github.com/adriangb/xpresso/compare/0.28.0...0.28.1
Source code(tar.gz)
Source code(zip)

Owner

Adrian Garcia Badaracco

GitHub Repository https://adriangb.com/xpresso

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