caspian-utils 0.2.2

A utility package for Caspian projects

Caspian Utils (casp)

Python is finally reactive.

Caspian Utils is the core utility package behind the Caspian framework ecosystem. It provides the building blocks used by Caspian projects: FastAPI-first plumbing, HTML/template processing, reactive integration patterns, RPC helpers, and common DX utilities.

• PyPI package name: casp
• Framework/brand name: Caspian (Caspian Utils is the shared library)

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Why Caspian Utils?

Modern web stacks often require a separate Node backend, bundlers, and a growing set of conventions. Caspian projects remove that complexity while keeping the power:

• Keep the DOM as the source of truth
• Write async Python for server logic
• Call server functions directly from the UI via RPC
• Ship without a bundler or build pipeline

Caspian Utils exists to make those patterns reusable across apps and tooling.

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Key Capabilities

FastAPI engine (native async)

Run application logic in async Python and leverage the FastAPI ecosystem (middleware, dependency injection, validation, Starlette sessions, etc.).

Reactive DOM (no build step)

Modify HTML and see changes instantly. No Webpack/Vite required. The DOM is the runtime surface.

File-system routing

Create pages like:

app/users/index.py
app/users/index.html

Caspian projects mount routes automatically based on your folder structure.

Type-safe RPC (no API routes)

Call Python functions directly from the frontend without manually creating REST endpoints.

Prisma ORM integration (optional)

Define your schema once and use an auto-generated, type-safe client in Python (no SQL boilerplate).

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Installation

pip install caspian-utils

Python: >=3.11

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Quick Start (Conceptual)

A typical Caspian-style app is split into:

• app/**/index.html for UI
• app/**/index.py (or actions modules) for backend logic / RPC
• optional app/**/layout.html for nested layouts

1) Reactive UI in HTML

<!-- app/todos/index.html -->

<!-- 1. Import Python Components -->
<!-- @import { Badge } from ../components/ui -->

<div class="flex gap-2 mb-4">
  <Badge variant="default">Tasks: {todos.length}</Badge>
</div>

<!-- 2. Reactive loop -->
<ul>
  <template pp-for="todo in todos">
    <li key="{todo.id}" class="p-2 border-b">{todo.title}</li>
  </template>
</ul>

<script>
  // 3. State initialized by Python backend automatically
  const [todos, setTodos] = pp.state([[todos]]);
</script>

2) Direct async RPC in Python

# actions.py

from casp.rpc import rpc
from src.lib.prisma.db import prisma

@rpc(require_auth=True)
async def like_post(post_id: str):
    # 1. Direct DB access (async)
    post = await prisma.post.update(
        where={"id": post_id},
        data={"likes": {"increment": 1}},
    )
    # 2. Return data directly to frontend
    return post.likes

3) Call RPC from the frontend

<button onclick="likePost()">Like Post</button>

<script>
  async function likePost() {
    const newCount = await pp.rpc("like_post", { post_id: "123" });
    setLikes(newCount);
  }
</script>

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What’s Included

Caspian Utils ships with integrations commonly used in Caspian projects:

• fastapi, uvicorn
• jinja2 (templating)
• python-dotenv (env loading)
• slowapi (rate limiting)
• starsessions (session management)
• python-multipart (uploads)
• httpx (HTTP client)
• tailwind-merge (class merging utility)
• werkzeug (helpers; used in some tooling)
• ID utilities: cuid2, nanoid, python-ulid

(Exact dependencies may vary by version; see setup.py in the repository.)

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Packaging Notes

If you are publishing to PyPI under caspian-utils, ensure your setup.py matches:

setup(
    name="caspian-utils",
    # ...
)

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Repository

Repository

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License

MIT

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Author

Jefferson Abraham