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substrate-contracts-node

This repository contains Substrate's node-template configured to include Substrate's pallet-contracts ‒ a smart contract module.

This repository is tracking Substrate's master. The last time it was synchronized with Substrate was up to 021f712.

This repository contains a couple of modifications that make it unsuitable for a production deployment, but a great fit for development and testing:

  • The unstable features of the pallet-contracts are enabled by default (see the runtime/Cargo.toml).
  • The consensus algorithm has been switched to manual-seal in #42. Hereby blocks are authored immediately at every transaction, so there is none of the typical six seconds block time associated with grandpa or aura.
  • If no CLI arguments are passed the node is started in development mode by default.
  • A custom logging filter is applied by default that hides block production noise and prints the contracts debug buffer to the console.
  • With each start of the node process the chain starts from genesis ‒ so no chain state is retained, all contracts will be lost! If you want to retain chain state you have to supply a --base-path.
  • For pallet_contracts::Config we increased the allowed contract sizes. This avoids running into CodeTooLarge when uploading contracts during development. See the comment in runtime/src/lib.rs for more details.

If you are looking for a node suitable for production see these configurations:

Installation

Download Binary

The easiest way is to download a binary release from our releases page and just execute ./substrate-contracts-node.

Build Locally

Follow the official installation steps to set up all Substrate prerequisites.

Afterwards you can install this node via

cargo install contracts-node --git https://github.com/paritytech/substrate-contracts-node.git --force --locked

The --locked flag makes the installation use the same versions as the Cargo.lock in those repositories ‒ ensuring that the last known-to-work version of the dependencies are used.

The latest confirmed working Substrate commit which will then be used is 021f712.

Usage

To run a local dev node execute

substrate-contracts-node

A new chain in temporary directory will be created each time the command is executed. This is the default for this node. If you want to persist chain state across runs you need to specify a directory with --base-path.

Show only Errors and Contract Debug Output

To have only errors and contract debug output show up on the console you can supply -lerror,runtime::contracts=debug when starting the node.

Important: Debug output is only printed for RPC calls or off-chain tests ‒ not for transactions!

See our FAQ for more details: How do I print something to the console from the runtime?.

Connect with frontend

Once the node template is running locally, you can connect to it with frontends like Contracts UI or Polkadot-JS Apps and interact with your chain.

How to synchronize with Substrate

  • Check Substrate's node-template for new commits since the last time someone synchronized this repository with Substrate. The commit hash of the last sync is mentioned in this readme.
  • Apply each commit that happened in this node-template folder since the last sync.
  • Check commits for pallet-contracts since the last time someone synchronized this repository with Substrate in order to not miss any important changes.
  • Execute cargo update -p pallet-contracts for this repository. The specific crate which is mentioned here is actually not important: since Substrate uses git references for its Substrate dependencies it means that once one package is updated all are.
  • Increment the minor version number in node/Cargo.toml and runtime/Cargo.toml.
  • Execute cargo run --release -- --tmp. If successful, it should produce blocks and a new, up to date, Cargo.lock will be created.
  • Update this readme with the hash of the Substrate master commit with which you synchronized. The hash appears two times in this readme.
  • Create a PR with the changes, have it reviewed and merged.
  • Replace XX in this command with your incremeted version number and execute it: git checkout main && git pull && git tag v0.XX.0 && git push origin v0.XX.0. This will push a new tag with the version number to this repository.
  • We have set this repository up in a way that tags à la vX.X.X trigger a CI run that creates a GitHub draft release. You can observe CI runs on GitLab. This draft release will contain a binary for Linux and Mac and appear under Releases. Add a description in the style of "Synchronized with Substrate commit c0ee2a." and publish it.