High-performance asset caching for multi-page applications

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JensRoland

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Project description

Skybolt Python

Python adapter for Skybolt - High-performance asset caching for multi-page applications.

Installation

pip install skybolt

Or with uv:

uv add skybolt

Prerequisites

Install and configure the Vite plugin: npm install @skybolt/vite-plugin
Build your project: npm run build
Ensure render-map.json is generated in your build output

Usage

from skybolt import Skybolt

# Initialize with render map path and cookies
sb = Skybolt("dist/.skybolt/render-map.json", cookies=request.cookies)

<!DOCTYPE html>
<html>
<head>
    {{ sb.css("src/css/critical.css")|safe }}
    {{ sb.launch_script()|safe }}
    {{ sb.css("src/css/main.css")|safe }}
</head>
<body>
    <h1>Hello Skybolt!</h1>
    {{ sb.script("src/js/app.js")|safe }}
</body>
</html>

API

`Skybolt(render_map_path, cookies=None, cdn_url=None)`

Create a new Skybolt instance.

render_map_path - Path to render-map.json generated by Vite plugin
cookies - Cookie dictionary (defaults to None)
cdn_url - Optional CDN URL prefix (e.g., 'https://cdn.example.com')

# Basic usage
sb = Skybolt("dist/.skybolt/render-map.json", cookies=request.cookies)

# With CDN
sb = Skybolt(
    "dist/.skybolt/render-map.json",
    cookies=request.cookies,
    cdn_url="https://cdn.example.com"
)

`css(entry: str, async_load: bool = False) -> str`

Render CSS asset.

First visit: Inlines CSS with caching attributes
Repeat visit: Outputs <link> tag (Service Worker serves from cache)

When async_load is True, CSS loads non-blocking:

First visit: Uses media="print" trick, swaps to all on load
Repeat visit: Uses <link rel="preload"> with onload

# Blocking (default) - for critical CSS
sb.css("src/css/critical.css")

# Non-blocking - for non-critical CSS
sb.css("src/css/main.css", async_load=True)

`script(entry: str, module: bool = True) -> str`

Render JavaScript asset.

First visit: Inlines JS with caching attributes
Repeat visit: Outputs <script> tag (Service Worker serves from cache)

# ES module (default)
sb.script("src/js/app.js")

# Classic script
sb.script("src/js/legacy.js", module=False)

`launch_script() -> str`

Render the Skybolt client launcher. Call once in <head> before other assets.

<head>
    {{ sb.launch_script()|safe }}
</head>

`get_asset_url(entry: str) -> str | None`

Get the URL for an asset (for manual use cases).

url = sb.get_asset_url("src/css/main.css")
# "/assets/main-Pw3rT8vL.css"

`get_asset_hash(entry: str) -> str | None`

Get the content hash for an asset.

hash = sb.get_asset_hash("src/css/main.css")
# "Pw3rT8vL"

`preload(entry, as_type, mime_type=None, crossorigin=None, fetchpriority=None) -> str`

Render preload link for critical resources like fonts and images.

# Preload hero image with high priority
sb.preload("images/hero.jpg", as_type="image", fetchpriority="high")

# Preload font
sb.preload("fonts/inter.woff2", as_type="font", mime_type="font/woff2", crossorigin="anonymous")

# Preload a Vite-built asset (resolved from render-map)
sb.preload("src/css/main.css", as_type="style")

Parameters:

entry - Source file path or direct URL
as_type - Resource type ('image', 'font', 'style', 'script', 'fetch')
mime_type - MIME type (e.g., 'font/woff2', 'image/webp')
crossorigin - Crossorigin attribute ('anonymous', 'use-credentials')
fetchpriority - Fetch priority ('high', 'low', 'auto')

Service Worker Setup

The Service Worker must be served from your domain root. Configure your web server:

Nginx:

location = /skybolt-sw.js {
    alias /path/to/dist/skybolt-sw.js;
}

Apache (.htaccess):

RewriteRule ^skybolt-sw\.js$ dist/skybolt-sw.js [L]

Framework Integration

Django

# views.py
from skybolt import Skybolt

def index(request):
    sb = Skybolt("static/.skybolt/render-map.json", cookies=request.COOKIES)
    return render(request, "index.html", {"sb": sb})

<!-- templates/index.html -->
<!DOCTYPE html>
<html>
<head>
    {{ sb.css("src/css/critical.css")|safe }}
    {{ sb.launch_script()|safe }}
    {{ sb.css("src/css/app.css")|safe }}
</head>
<body>
    <!-- content -->
    {{ sb.script("src/js/app.js")|safe }}
</body>
</html>

Flask

from flask import Flask, render_template, request
from skybolt import Skybolt

app = Flask(__name__)

@app.route("/")
def index():
    sb = Skybolt("static/.skybolt/render-map.json", cookies=request.cookies)
    return render_template("index.html", sb=sb)

FastAPI

from fastapi import FastAPI, Request
from fastapi.responses import HTMLResponse
from fastapi.templating import Jinja2Templates
from skybolt import Skybolt

app = FastAPI()
templates = Jinja2Templates(directory="templates")

@app.get("/", response_class=HTMLResponse)
async def index(request: Request):
    sb = Skybolt("static/.skybolt/render-map.json", cookies=request.cookies)
    return templates.TemplateResponse("index.html", {"request": request, "sb": sb})

Requirements

Python 3.10+
Vite with @skybolt/vite-plugin

License

MIT

Project details

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Maintainers

JensRoland

These details have not been verified by PyPI

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3.4.0

Dec 1, 2025

This version

3.3.0

Nov 30, 2025

3.2.0

Nov 27, 2025

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Source repository:
- Permalink: JensRoland/skybolt-python@e562113c4ec85c17d630603cda5dfdd5e415fa30
- Branch / Tag: refs/heads/main
- Owner: https://github.com/JensRoland
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: tag-and-publish.yml@e562113c4ec85c17d630603cda5dfdd5e415fa30
- Trigger Event: push

skybolt 3.3.0

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Project description

Skybolt Python

Installation

Prerequisites

Usage

API

Skybolt(render_map_path, cookies=None, cdn_url=None)

css(entry: str, async_load: bool = False) -> str

script(entry: str, module: bool = True) -> str

launch_script() -> str

get_asset_url(entry: str) -> str | None

get_asset_hash(entry: str) -> str | None

preload(entry, as_type, mime_type=None, crossorigin=None, fetchpriority=None) -> str

Service Worker Setup

Framework Integration

Django

Flask

FastAPI

Requirements

License

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GitHub Statistics

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Unverified details

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Release history Release notifications | RSS feed

Download files

Source Distribution

Built Distribution

File details

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Provenance

File details

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Provenance

`Skybolt(render_map_path, cookies=None, cdn_url=None)`

`css(entry: str, async_load: bool = False) -> str`

`script(entry: str, module: bool = True) -> str`

`launch_script() -> str`

`get_asset_url(entry: str) -> str | None`

`get_asset_hash(entry: str) -> str | None`

`preload(entry, as_type, mime_type=None, crossorigin=None, fetchpriority=None) -> str`