This is a project for learning exploring blockchain runtime development with Substrate, Cumulus Parachain and the FRAME.
This project implements a simple XCMP protocol between two parachains where one parachain makes pallet call of another parachain.
This pallet defines a simple logic to set , increment and make xcm calls. Same pallet is used on both the parachain for testing xcmp functionality.
Requirements
- Follow Below steps to set up Relay Node and Parachain Node
- Only sudo user can make pallet call
- Build HRMP channel between( Parachain(2000) , Parachain(2001))
set_counter(origin, para, value)
set_counter method takes paraid and value as input and makes set_counter_value() pallet call of Parachain(paraID) by sending xcm message.
increment_counter(origin,para)
increment_counter method takes paraId and makes increment_counter_value() pallet call of Parachain(ParaId) by sending xcm message.
Counter: StorageValue => u32
CounterSet(ParaId, u32)CounterIncremented(ParaId)
ErrorSettingCounterErrorIncrementingCounter
# Clone the Polkadot Repository
$ git clone https://github.com/paritytech/polkadot.git
# Switch into the Polkadot directory
$ cd polkadot
# Checkout the proper commit
git checkout v0.9.16
# Build the relay chain Node
$ cargo build --release
# Check if the help page prints to ensure the node is built correctly
$ ./target/release/polkadot --help
There must be minimum 2 validator for 1 parachain. In this project we will be using two parachains , so therefore we will require 3 validator nodes Check here to learn more here.
./target/release/polkadot build-spec \
--chain rococo-local \
--raw \
--disable-default-bootnode \
> rococo_local.jsonYou can use pre configured chain spec file for testing from here
- Alice
./target/release/polkadot \
--alice \
--validator \
--base-path /tmp/relay/alice \
--chain ./rococo-custom-3-raw.json \
--port 30333 \
--ws-port 9944- Bob
./target/release/polkadot \
--bob \
--validator \
--base-path /tmp/relay-bob \
--chain ./rococo-custom-3-raw.json \
--bootnodes /ip4/127.0.0.1/tcp/30333/p2p/<ALICE NODE IDENTIFIER> \
--port 30334 \
--ws-port 9945- Charlie
./target/release/polkadot \
--charlie \
--validator \
--base-path /tmp/relay-charlie \
--chain /Users/salman01z/Crypto/parachains/chain_spec_files/rococo-custom-3-raw.json \
--bootnodes /ip4/127.0.0.1/tcp/30333/p2p/<ALICE NODE IDENTIFIER>\
--port 30335 \
--ws-port 9946
Resure Parachain ID using [Polkadot-js](https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A9944#/parachains/parathreads)
Parachain ids start with 2000
- Generate Plain spec with:
./target/release/parachain-collator build-spec --disable-default-bootnode > rococo-local-parachain-plain.json- Update Para ID in Plain Spec file
// --snip--
"para_id": 2000, // <--- your already registered ID
// --snip--
"parachainInfo": {
"parachainId": 2000 // <--- your already registered ID
},
// --snip--- Generate Raw spec file from Plain Spec file
./target/release/parachain-collator build-spec --chain rococo-local-parachain-plain.json --raw --disable-default-bootnode > rococo-local-parachain-2000-raw.json- Generate Wasm runtime blob
./target/release/parachain-collator export-genesis-wasm --chain rococo-local-parachain-2000-raw.json > para-2000-wasm- Generate Parachain Genesis State (hex encoded)
./target/release/parachain-collator export-genesis-state --chain rococo-local-parachain-2000-raw.json > para-2000-genesis ./target/release/parachain-collator \
--alice \
--collator \
--force-authoring \
--chain rococo-local-parachain-2000-raw.json \
--base-path /tmp/parachain1/alice \
--port 40333 \
--ws-port 8844 \
-- \
--execution wasm \
--chain ./rococo-custom-3-raw.json \
--bootnodes /ip4/127.0.0.1/tcp/30333/p2p/<Bootnode Identifier> \
--port 30343 \
--ws-port 9977Repeat All the above steps with different Para ID, base path and ports. Use same relay chain spec.