poetry-dynamic-caching 0.2.0

Plugin for Poetry to dynamically use one or more repositories based on availability.

poetry-dynamic-caching

A plugin for Poetry that automatically switches to a package cache (like devpi) when it's available, falling back to PyPI when it's not.

Why?

Poetry allows specifying a custom primary repository. However if that repository isn't available Poetry will hang during poetry install or similar commands. This plugin checks if your cache is reachable before each install command and routes traffic accordingly.

[!NOTE] This plugin has been developed and tested for devpi only. Other cache/repository implementations might work as well. If not,let us know and we can look for a solution!

Installation

To install the plugin system wide use:

poetry self add poetry-dynamic-caching

You can also use the plugin only in the context of another Poetry project by adding the following to the pyproject.toml:

[tool.poetry.requires-plugins]
poetry-dynamic-caching = { version = "*" }

After that you can run poetry install --dry-run to install the plugins and not the dependencies.

Configuration

Add the following to your project's pyproject.toml:

[tool.poetry-dynamic-caching]
cache = [
   { type = "devpi", url = "https://my-cache-server.example" },
   { type = "devpi", url = "https://my-cache-server.invalid:1234" }
]

The first available entry in the list will be used.

Alternatively, you can set the DEVPI_URL environment variable.

[!NOTE] The environment variable DEVPI_URL overshadows the cache setting in the pyproject.toml file.

How it works

When you run any installer command (poetry install, poetry add, poetry lock, etc.), the plugin:

1. Sends a request to <devpi_url>/+status
2. If the cache responds with 200, removes any PyPI repositories from the internal state of Poetry
3. Adds the configured cache as a repository to the interal state of Poetry
4. If the cache isn't responding with 200, do nothing

Enable debug output to see what's happening:

poetry install -vvv

Requirements

• Python >= 3.12
• Poetry >= 2.3.1

License

MIT