ergane 0.7.1

High-performance async web scraper with selectolax parsing

Ergane

High-performance async web scraper with HTTP/2 support, built with Python.

Named after Ergane, Athena's title as goddess of crafts and weaving in Greek mythology.

Features

• Programmatic API — Crawler, crawl(), and stream() let you embed scraping in any Python application
• Hook System — Intercept requests and responses with the CrawlHook protocol
• HTTP/2 & Async — Fast concurrent connections with per-domain rate limiting and retry logic
• Fast Parsing — Selectolax HTML parsing (16x faster than BeautifulSoup)
• Built-in Presets — Pre-configured schemas for popular sites (no coding required)
• Custom Schemas — Define Pydantic models with CSS selectors and type coercion
• Multi-Format Output — Export to CSV, Excel, Parquet, JSON, JSONL, or SQLite
• Response Caching — SQLite-based caching for faster development and debugging
• MCP Server — Expose scraping tools to LLMs via the Model Context Protocol
• JavaScript Rendering — Render JS-heavy pages via Playwright
• Production Ready — robots.txt compliance, graceful shutdown, checkpoints, proxy support

Installation

pip install ergane

# With JavaScript rendering support
pip install ergane[js]

# With MCP server support
pip install ergane[mcp]

Quick Start

CLI

# Use a built-in preset (no code needed)
ergane --preset quotes -o quotes.csv

# Crawl a custom URL
ergane -u https://example.com -n 100 -o data.parquet

# List available presets
ergane --list-presets

Python

import asyncio
from ergane import Crawler

async def main():
    async with Crawler(
        urls=["https://quotes.toscrape.com"],
        max_pages=20,
    ) as crawler:
        async for item in crawler.stream():
            print(item.url, item.title)

asyncio.run(main())

MCP Server

pip install ergane[mcp]
ergane mcp

Add to your Claude Desktop or Claude Code config:

{
  "mcpServers": {
    "ergane": {
      "command": "ergane",
      "args": ["mcp"]
    }
  }
}

The server exposes four tools: list_presets_tool, extract_tool, scrape_preset_tool, and crawl_tool.

Documentation

Guide	Description
CLI Reference	Commands, flags, presets, schemas, config files, troubleshooting
Python Library	Crawler API, hooks, typed extraction, authentication, advanced usage
MCP Server	Setup, tool reference, error handling, result format

Built-in Presets

Preset	Site	Fields Extracted
hacker-news	news.ycombinator.com	title, link, score, author, comments
github-repos	github.com/search	name, description, stars, language, link
reddit	old.reddit.com	title, subreddit, score, author, comments, link
quotes	quotes.toscrape.com	quote, author, tags
amazon-products	amazon.com	title, price, rating, reviews, link
ebay-listings	ebay.com	title, price, condition, shipping, link
wikipedia-articles	en.wikipedia.org	title, link
bbc-news	bbc.com/news	title, summary, link

Architecture

Ergane separates the engine (pure async library) from its three interfaces: the CLI (Rich progress bars, signal handling), the Python library (direct import), and the MCP server (LLM integration). Hooks plug into the pipeline at two points: after scheduling and after fetching.

         CLI (main.py)              Python Library             MCP Server
    ┌──────────────────────┐  ┌──────────────────────┐  ┌──────────────────────┐
    │  Click options        │  │  from ergane import   │  │  FastMCP (stdio)     │
    │  Rich progress bar    │  │  Crawler / crawl()    │  │  4 tools + resources │
    │  Signal handling      │  │  stream()             │  │  ergane mcp          │
    │  CrawlOptions config  │  │                       │  │                      │
    └──────────┬───────────┘  └────────────┬──────────┘  └──────────┬───────────┘
               │                           │                        │
               └───────────────┬───────────┴────────────────────────┘
                              │
                              ▼
               ┌──────────────────────────────────┐
               │         Crawler  (engine)         │
               │    Pure async · no I/O concerns   │
               │    Spawns N worker coroutines     │
               └──────────────┬───────────────────┘
                              │
              ┌───────────────┼───────────────────┐
              │               │                   │
              ▼               ▼                   ▼
      ┌──────────────┐ ┌───────────┐   ┌──────────────────────┐
      │  Scheduler   │ │  Fetcher  │   │   Pipeline           │
      │  URL frontier│ │  HTTP/2   │   │  BatchWriter strategy│
      │  dedup queue │ │  retries  │   │  per-format writers  │
      └──────┬───────┘ └─────┬─────┘   └──────────────────────┘
             │               │
             ▼               ▼
  ┌──────────────────────────────────────────────────┐
  │                Worker loop (× N)                  │
  │                                                   │
  │  1. Scheduler.get()   → CrawlRequest              │
  │  2. hooks.on_request  → modify / skip             │
  │  3. Fetcher.fetch()   → CrawlResponse             │
  │  4. hooks.on_response → modify / discard          │
  │  5. Parser.extract()  → Pydantic model / dict     │
  │  6. Pipeline.add()    → buffered output           │
  │  7. extract_links()   → new URLs → Scheduler      │
  └──────────────────────────────────────────────────┘

  ┌──────────────────────────────────────────────────┐
  │               Cross-cutting concerns              │
  │                                                   │
  │  Cache ─── SQLite response cache with TTL         │
  │  Checkpoint ─ periodic JSON snapshots for resume  │
  │  Schema ── YAML → FieldConfig → extraction        │
  └──────────────────────────────────────────────────┘

License

MIT