parachain

BTC Parachain

This repository is based on the Substrate Node Template.

Build

Install Rust:

curl https://sh.rustup.rs -sSf | sh

Initialize your Wasm Build environment:

./scripts/init.sh

Build WASM and native code:

cargo build --release

Test

To download the recent 100 Bitcoin blocks run:

python ./scripts/fetch_bitcoin_data.py

Execute tests:

cargo test --release

Run

Single Node Development Chain

Purge any existing developer chain state:

./target/release/node-template purge-chain --dev

Start a development chain with:

./target/release/node-template --dev

Detailed logs may be shown by running the node with the following environment variables set: RUST_LOG=debug RUST_BACKTRACE=1 cargo run -- --dev.

Multi-Node Local Testnet

If you want to see the multi-node consensus algorithm in action locally, then you can create a local testnet with two validator nodes for Alice and Bob, who are the initial authorities of the genesis chain that have been endowed with testnet units.

Optionally, give each node a name and expose them so they are listed on the Polkadot telemetry site.

You'll need two terminal windows open.

We'll start Alice's substrate node first on default TCP port 30333 with her chain database stored locally at /tmp/alice. The bootnode ID of her node is QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR, which is generated from the --node-key value that we specify below:

cargo run -- \
  --base-path /tmp/alice \
  --chain=local \
  --alice \
  --node-key 0000000000000000000000000000000000000000000000000000000000000001 \
  --telemetry-url ws://telemetry.polkadot.io:1024 \
  --validator

In the second terminal, we'll start Bob's substrate node on a different TCP port of 30334, and with his chain database stored locally at /tmp/bob. We'll specify a value for the --bootnodes option that will connect his node to Alice's bootnode ID on TCP port 30333:

cargo run -- \
  --base-path /tmp/bob \
  --bootnodes /ip4/127.0.0.1/tcp/30333/p2p/QmRpheLN4JWdAnY7HGJfWFNbfkQCb6tFf4vvA6hgjMZKrR \
  --chain=local \
  --bob \
  --port 30334 \
  --telemetry-url ws://telemetry.polkadot.io:1024 \
  --validator

Runtime Upgrades

1. Implement storage migration logic using the module's on_runtime_upgrade hook.
2. Bump the module's default storage Version.
3. Increment the runtime spec_version.
4. Compile the WASM runtime: cargo build --release -p btc-parachain-runtime.
5. Use the sudo module to wrap a call to system setCode(code).

The WASM file can be found here:

/btc-parachain/target/release/wbuild/btc-parachain-runtime/btc_parachain_runtime.compact.wasm

Additional instructions can be found here:

• https://substrate.dev/docs/en/knowledgebase/runtime/upgrades
• https://substrate.dev/docs/en/tutorials/upgrade-a-chain/sudo-upgrade

Benchmarks

To run benchmarks for a particular module (e.g. issue):

cd ./parachain
cargo run --features runtime-benchmarks --release -- \
  benchmark \
  --chain dev \
  --execution=wasm \
  --wasm-execution=compiled \
  --pallet "issue" \
  --extrinsic "*" \
  --steps 100 \
  --repeat 10 \
  --output ../crates/issue/src/default_weights.rs \
  --template ../.deploy/weight-template.hbs

This will overwrite the default weights (i.e. in the example, ../crates/issue/src/default_weights.rs).

Code Coverage

To generate a code coverage report, install and run tarpaulin:

cargo install cargo-tarpaulin
cargo tarpaulin -v \
  --exclude-files '/test,/mock.rs,/mock/mod.rs,/default_weights.rs,/weights.rs,/ext.rs,/runtime-api/,/benchmarking.rs,parachain/*' \
  --out Html \
  --output-dir "./cov"