Encointer Parachain:

This is the repository for the encointer collator to operate a parachain. It is forked from the Cumulus repository.

Demos

• Sybil Defense Demo
• Native Downward-/ Upward Token Tx Demo

Launch a local setup with polkadot-launch

###Build sudo-patched polkadot binary
Inside the parent directory of this repo, execute the following commands:

git clone https://github.com/paritytech/polkadot
cd polkadot
git fetch
git checkout v0.9.18
# add sudo to all types of relaychain to simplify and accelerate testing
git cherry-pick 755a4b69c94ba75618080c76d25133b11c1d58db
# use `cargo install diener` if not done already
diener update --substrate --branch polkadot-v0.9.18
cargo build --release

Run: cp target/release/polkadot ../../bin/polkadot-0.9.24-sudo
It is assumed that the bin directory exists at this relative path. Note: When using the launch-rococo-local-with-encointer setup it is assumed that the bin folder also contains a polkadot-v0.9.28 binary.

Setup local testnet with polkadot-launch

polkadot-launch lets you easily setup a local testnet. The following procedure will setup a local testnet with three relay chain nodes and two encointer parachains. It will also setup up a XCM (cross chain messaging) channel between the two chains.

Note 2: The polkadot-launch-config.json and the commands below assume that the polkadot-launch directory is on the same level as this repo's directory.

Preliminaries: you need to have yarn and node installed

Inside the parent directory of this repo, execute the following commands:

# We need to build it from source. The one from the yarn registry does not work with our code.
git clone https://github.com/paritytech/polkadot-launch
cd polkadot-launch
yarn install
yarn build

cd ../encointer-parachain
cargo build --release
node ../polkadot-launch/dist/cli.js ./polkadot-launch/launch-rococo-local-with-launch.json

This launches the local testnet and creates 5 log files: alice.log, bob.log, charlie.log, which are the logs of the relay chain nodes and 9944.log, 9955.log, which are the logs of the two parachains.

Executing the ./tmux_setup.sh script at the project root will set up tmux with three panes that tailing the logs of alice.log, 9944.log and 9955.log.

manual test setup step by step

# Generate a raw chain spec
./target/release/polkadot build-spec --chain rococo-local --disable-default-bootnode --raw > rococo-local-cfde.json

# Alice
./target/release/polkadot --chain rococo-local-cfde.json --alice --tmp

# Bob (In a separate terminal)
./target/release/polkadot --chain rococo-local-cfde.json --bob --tmp --port 30334

Launch the Parachain

# Compile
git clone https://github.com/encointer/encointer-parachain.git
git checkout master
cargo build --release

# Export genesis state
./target/release/encointer-collator export-genesis-state --chain launch-rococo-local --parachain-id 2000 > encointer-local-genesis.state

# Export genesis wasm
./target/release/encointer-collator export-genesis-wasm --chain launch-rococo-local > encointer-local-genesis.wasm

# Collator
./target/release/encointer-collator --collator --tmp --parachain-id 2000 --chain launch-rococo-local --port 40335 --ws-port 9946 -- --execution wasm --chain ../polkadot/rococo-local-cfde.json --port 30337 --ws-port 9981

Register the Parachain

Go to Polkadot Apps connect to the default local port (Alice) and register the parachain via the paraSudoWrapper pallet. After registering, the collator should start producing blocks when the next era starts.

Note: Change the ParaId to 1862 when registering the parachain.

Test Encointer Client

git clone https://github.com/encointer/encointer-node.git
cargo build --release
./target/release/encointer-client-notee -p 9946 get-phase
# should print the phase
./target/release/encointer-client-notee -p 9946 next-phase
# should progress phase

Deploy on rococo

Prepare genesis state and wasm as follows:

# Export genesis state
# --parachain-id 1862 as an example that can be chosen freely. Make sure to everywhere use the same parachain id
./target/release/encointer-collator export-genesis-state --chain encointer-rococo --parachain-id 1862 > encointer-rococo-genesis.state

# Export genesis wasm
./target/release/encointer-collator export-genesis-wasm --chain encointer-rococo > encointer-rococo-genesis.wasm

then propose the parachain on rococo relay-chain

run collator

encointer-collator \
        --collator \
        --chain encointer-rococo \
        --parachain-id 1862 \
        --rpc-cors all \
        --name encointer-rococo-collator-1 \
        -- --execution wasm --chain rococo 

Caveats

• Don't forget to enable file upload if you perform drag and drop for the genesisHead and validationCode. If it is not enabled, Polkadot-js will interpret the path as a string and won't complain but the registration will fail.
• Don't forget to add the argument --chain encointer-rococo for the custom chain config. This argument is omitted in the Cumulus Workshop.
• The relay chain and the collator need to be about equally recent. This might require frequent rebasing of this repository on the rococo-v1 branch.
• Sanity check: The genesis state is printed when starting the collator. Make sure it matches the one from the genesis.state file.

Benchmark the runtimes

In ./scripts we have two scripts for benchmarking the runtimes.

Current benchmark

The current weights have been benchmarked with the following reference hardware:

2.3 GHz 8-Core Intel Core i9
16 GB 2400 MHz DDR4

Running benchmark

1. Compile the node with: cargo build --release --features runtime-benchmarks
2. run: ./scripts/benchmark_launch_runtime.sh and ./scripts/benchmark_encointer_runtime.sh.
3. If changed, update the reference hardware above.

Adding new pallets to be benchmarked

Every pallet with a type WeightInfo parameter in its config must be benchmarked.

1. [Cargo.toml] add <new_pallet>/runtime-benchmarks in the runtime-benchmarks feature section.
2. [runtime] Add the new pallet to be benchmarked to the define_benchmarks! macro in the runtime.
3. Run the benchmark as advised above.
4. [runtime/src/weights] add the new file to the modules
5. [runtime] replace the placeholder type WeightInfo = () with type WeightInfo = weights::<new_pallet>::WeightInfo<Runtime>

Update hardcoded chain-specs

We have some hardcoded chain-specs to be sure that independent binaries can work with the same genesis_hash. However, sometimes we need to update the nodes' (i.e. the client's) spec, when we perform a substrate update. The following script creates new hard-coded chain-specs while migrating relevant data.

./scripts/update_hardcoded_chain_specs.py --migrate-genesis

More Resources

• Thorough Readme about Rococo and Collators in general in the original repository of this fork.
• Parachains on Rococo in the Polkadot Wiki