mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Joshy Orndorff
58 lines
2.7 KiB
Markdown
58 lines
2.7 KiB
Markdown
# Cumulus
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A set of tools for writing [Polkadot](https://github.com/paritytech/polkadot) parachains that are based on [Substrate](https://github.com/paritytech/substrate).
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It's easy to write blockchains using Substrate, and the overhead of writing parachains' distribution, p2p, database, and synchronization layers is generally high and should be reusable. This project aims to make it easy to write parachains for Polkadot by leveraging the power of Substrate.
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Cumulus clouds are shaped sort of like dots and are up in the air, like this project (as it is an initial prototype -- expect a rename when it gets cooler.)
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## cumulus-consensus
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For now, this is only project contained in this repo. *cumulus-consensus* is a consensus engine for Substrate which follows a Polkadot relay chain. This will run a Polkadot node internally, and dictate to the client and synchronization algorithms which chain to follow, finalize, and treat as best.
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## cumulus-runtime
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A planned wrapper around substrate runtimes to turn them into parachain validation code and to provide proof-generation routines.
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## cumulus-collator
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A planned Polkadot collator for the parachain.
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## Running a collator
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1. Checkout polkadot at `bkchr-cumulus-branch`.
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2. Run `Alice` and `Bob`:
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`cargo run --release -- --chain=${CUMULUS_REPO}/test/parachain/res/polkadot_chainspec.json --base-path=cumulus_relay_chain_node_0 --alice`
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`cargo run --release -- --chain=${CUMULUS_REPO}/test/parachain/res/polkadot_chainspec.json --base-path=cumulus_relay_chain_node_1 --bob --port 50666`
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Where `CUMULUS_REPO` is the path to the checkout of Cumulus.
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3. Switch back to this repository and generate the parachain genesis state:
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`cargo run --release -p cumulus-test-parachain-collator -- export-genesis-state genesis-state`
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4. Run the collator:
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`cargo run --release -p cumulus-test-parachain-collator -- --base-path cumulus_collator_path --bootnodes /ip4/127.0.0.1/tcp/30333/p2p/PEER_ID --bootnodes /ip4/127.0.0.1/tcp/50666/p2p/PEER_ID`
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`PEER_ID_${NAME}` needs to be replaced with the peer id of the polkadot validator that uses `${NAME}`
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as authority.
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5. Open `https://polkadot.js.org/apps/#/sudo` and register the parachain by calling `Registrar > RegisterPara`
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`id`: `100`
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`ParaInfo`: `Always`
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`code`: `CUMULUS_REPO/target/release/wbuild/cumulus-test-parachain-runtime/cumulus_test_parachain_runtime.compact.wasm`
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`initial_head_data`: Use the file you generated in step 3. (name: genesis-state)
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Now your parachain should be registered and the collator should start building blocks and sending
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them to the relay chain.
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6. Now the `collator` should build blocks and the relay-chain should include them. You can check that the `parachain-header` for parachain `100` is changing.
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