subscrape

This is a growing library of Python facilities to scrape Substrate and Moonbeam-based chains. Substrate chains are scraped using Subscan while EVM-based chains use Moonscan.io and Blockscout.io.

Roadmap: https://app.subsocial.network/@alice_und_bob/subscrape-releasing-v1-0-and-roadmap-for-v2-0-32075

The basic workflow of bin/scrape.py considers the configuration presented in data/scrape_config.json to traverse through the given chains and perform the operations for each chain. For Substrate, scraping extrinsics and transfers is supported.

Data is stored locally using SubscanDB and can be used to use the data and transform it. The application works in a way that subsequent runs will only fetch deltas.

bin/transfers_all_chains.py takes addresses and chains from data/transfers_config.json to create a CSV of all transfers associated with that accounts.

Links

• v2.0 Milestones
• Roadmap
• Initial announcement and important updates

Documentation

• Configuration
• Architecture

Limitations

Error handling is not very sophisticated, so if the scrape is interrupted by an uncaught exception, the delta might be incomplete and subsequent runs might miss some data. To remedy the issue, the delta must be deleted and the scraper run again.

Usage

Installation

virtualenv venv venv\scripts\activate pip install -Ur .\PipRequirements.txt bin\scrape.py

Subscan API Key

If you have a Subscan API key, drop it in a file named config/subscan-key. Similarly, if you have a Moonscan.io API key, drop it in a file named config/moonscan-key.

Example applications

Take a look at the /bin/ folder. There are some sample applications there.

Using scrape.py as application

• copy config/sample_scrape_config.json to config/scrape_config.json
• configure to your desire. See configuration
• run scrape.py
• corresponding files will be created in data/

Consuming scrape.py as helper

• from scrape import scrape
• create a dict analogouos to config/sample_scrape_config.json
• call it inline via scrape(config)

Extracting all transfers across chains for an address

• copy config/sample_transfers_config.json to config/transfers_config.json
• configure as needed.
• run bin/transfers_all_chains.py
• output is in data/transfers.csv