A modified version of fork-off-substrate to work with the nodle chain

README.md

Fork off substrate

This script allows bootstrapping a new substrate chain with the current state of a live chain. Using this, you can create a fork of Polkadot, Kusama and other substrate chain for development purposes.

Usage

1. Clone this repository and install dependencies

   git clone https://github.com/maxsam4/fork-off-substrate.git
   cd fork-off-substrate
   npm i

2. Create a folder called data inside the top folder (fork-off-substrate).

   mkdir data

3. Copy the executable/binary of your substrate node inside the data folder and rename it to binary.

4. Copy the runtime WASM blob of your substrate chain inside the data folder and rename it to runtime.wasm. To get the WASM blob, compile your substrate chain and look for ./target/release/wbuild/runtime/runtime.compact.wasm. If you are forking Polkadot/Kusama/Westend, you can download the WASM blobs from Polkadot's release page.

5. If your substrate chain uses additional custom types than what are available in polkadot.js, define them in a JSON file of format { "types": "{ <YOUR_TYPES> }" }. Copy the file to the data folder and rename it to schema.json.

6. Either run a full node for your blockchain locally(Recommended) or have an eternal endpoint handy.

7. Run the script

   • If using a local node, simply run the script using

     npm start

   • If you are using an external/non-default endpoint, you need to provide it to the script via the HTTP_RPC_ENDPOINT environment variable

     HTTP_RPC_ENDPOINT=https://example.com npm start

8. You should have the genesis file for the forked chain inside the data folder. It will be called fork.json.

9. You can now run a new chain using this genesis file

   ./binary --chain fork.json --alice

Read more

If you would like to understand how this script works, please read this blog post

Credits

This script is based on a script shared in the substrate riot channel

index.js

const fs = require('fs');
const path = require('path');
const chalk = require('chalk');
const { ApiPromise } = require('@polkadot/api');
const { HttpProvider } = require('@polkadot/rpc-provider');
const { xxhashAsHex } = require('@polkadot/util-crypto');
const execFileSync = require('child_process').execFileSync;
const execSync = require('child_process').execSync;
const binaryPath = path.join(__dirname, 'data', 'binary');
const wasmPath = path.join(__dirname, 'data', 'runtime.wasm');
const schemaPath = path.join(__dirname, 'data', 'schema.json');
const hexPath = path.join(__dirname, 'data', 'runtime.hex');
const originalSpecPath = path.join(__dirname, 'data', 'genesis.json');
const forkedSpecPath = path.join(__dirname, 'data', 'fork.json');
const storagePath = path.join(__dirname, 'data', 'storage.json');

// Using http endpoint since substrate's Ws endpoint has a size limit.
const provider = new HttpProvider(process.env.HTTP_RPC_ENDPOINT || 'http://localhost:9933')

/**
 * All module prefixes except those mentioned in the skippedModulesPrefix will be added to this by the script.
 * If you want to add any past module or part of a skipped module, add the prefix here manually.
 *
 * Any storage value’s hex can be logged via console.log(api.query.<module>.<call>.key([...opt params])),
 * e.g. console.log(api.query.timestamp.now.key()).
 *
 * If you want a map/doublemap key prefix, you can do it via .keyPrefix(),
 * e.g. console.log(api.query.system.account.keyPrefix()).
 *
 * For module hashing, do it via xxhashAsHex,
 * e.g. console.log(xxhashAsHex('System', 128)).
 */
let prefixes = ['0x26aa394eea5630e07c48ae0c9558cef7b99d880ec681799c0cf30e8886371da9' /* System.Account */];
// 0x26aa394eea5630e07c48ae0c9558cef7b99d880ec681799c0cf30e8886371da9177fb71c87f1ab63aff7ab5bf4335a65de9e8e08d48b46c9ea7a3a6d24c0e868ba88d31d731323c480f950c2f01d7045
const skippedModulesPrefix = ['System', 'Session', 'Babe', 'Grandpa', 'GrandpaFinality', 'FinalityTracker', 'Poa', 'Instance2Membership'];

async function main() {
  if (!fs.existsSync(binaryPath)) {
    console.log(chalk.red('Binary missing. Please copy the binary of your substrate node to the data folder and rename the binary to "binary"'));
    process.exit(1);
  }
  execFileSync('chmod', ['+x', binaryPath]);

  if (!fs.existsSync(wasmPath)) {
    console.log(chalk.red('WASM missing. Please copy the WASM blob of your substrate node to the data folder and rename it to "runtime.wasm"'));
    process.exit(1);
  }
  execSync('cat ' + wasmPath + ' | hexdump -ve \'/1 "%02x"\' > ' + hexPath);

  let api;
  console.log(chalk.green('We are intentionally using the HTTP endpoint. If you see any warnings about that, please ignore them.'));
  if (!fs.existsSync(schemaPath)) {
    console.log(chalk.yellow('Custom Schema missing, using default schema.'));
    api = await ApiPromise.create({ provider });
  } else {
    api = await ApiPromise.create({
      provider,
      types: require(schemaPath)
    });
  }

  // Download state of original chain
  console.log(chalk.green('Fetching current state of the live chain. Please wait, it can take a while depending on the size of your chain.'));
  const pairs = await provider.send('state_getPairs', ["0x"]);
  fs.writeFileSync(storagePath, JSON.stringify(pairs));

  // Populate the prefixes array
  const modules = JSON.parse(await api.rpc.state.getMetadata()).metadata.V11.modules;
  modules.forEach((module) => {
    if (module.storage) {
      if (!skippedModulesPrefix.includes(module.storage.prefix)) {
        prefixes.push(xxhashAsHex(module.storage.prefix, 128));
      }
    }
  });

  // Generate chain spec for original and forked chains
  execSync(binaryPath + ' build-spec --chain main --raw > ' + originalSpecPath);
  execSync(binaryPath + ' build-spec --chain dev --raw > ' + forkedSpecPath);

  let storage = JSON.parse(fs.readFileSync(storagePath, 'utf8'));
  let originalSpec = JSON.parse(fs.readFileSync(originalSpecPath, 'utf8'));
  let forkedSpec = JSON.parse(fs.readFileSync(forkedSpecPath, 'utf8'));

  // Modify chain name and id
  forkedSpec.name = originalSpec.name + '-fork';
  forkedSpec.id = originalSpec.id + '-fork';
  forkedSpec.protocolId = originalSpec.protocolId;

  // Grab the items to be moved, then iterate through and insert into storage
  storage
    .filter((i) => prefixes.some((prefix) => i[0].startsWith(prefix)))
    .forEach(([key, value]) => (forkedSpec.genesis.raw.top[key] = value));

  // Delete System.LastRuntimeUpgrade to ensure that the on_runtime_upgrade event is triggered
  delete forkedSpec.genesis.raw.top['0x26aa394eea5630e07c48ae0c9558cef7f9cce9c888469bb1a0dceaa129672ef8'];

  // Set the code to the current runtime code
  forkedSpec.genesis.raw.top['0x3a636f6465'] = '0x' + fs.readFileSync(hexPath, 'utf8').trim();

  // To prevent the validator set from changing mid-test, set Staking.ForceEra to ForceNone ('0x02')
  //forkedSpec.genesis.raw.top['0x5f3e4907f716ac89b6347d15ececedcaf7dad0317324aecae8744b87fc95f2f3'] = '0x02';

  fs.writeFileSync(forkedSpecPath, JSON.stringify(forkedSpec, null, 4));

  console.log('Forked genesis generated successfully. Find it at ./data/fork.json');
  process.exit();
}

main();

LICENSE

MIT License

Copyright (c) 2020 Mudit Gupta

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

package-lock.json

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package.json

{
  "name": "fork-off-substrate",
  "version": "1.0.0",
  "description": "This script allows bootstrapping a new substrate chain with the current state of a live chain",
  "main": "index.js",
  "scripts": {
    "start": "node index.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/maxsam4/fork-off-substrate.git"
  },
  "keywords": [
    "substrate",
    "polkadot",
    "kusama",
    "fork"
  ],
  "author": "Mudit Gupta <hi@mudit.blog>",
  "license": "MIT",
  "bugs": {
    "url": "https://github.com/maxsam4/fork-off-substrate/issues"
  },
  "homepage": "https://github.com/maxsam4/fork-off-substrate#readme",
  "dependencies": {
    "@polkadot/api": "^1.24.1",
    "chalk": "^4.1.0"
  }
}