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initial docify readme with some content #6333 #7093
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<div align="center"> | ||
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# Polkadot SDK's Parachain Template | ||
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<img height="70px" alt="Polkadot SDK Logo" src="https://github.com/paritytech/polkadot-sdk/raw/master/docs/images/Polkadot_Logo_Horizontal_Pink_White.png#gh-dark-mode-only"/> | ||
<img height="70px" alt="Polkadot SDK Logo" src="https://github.com/paritytech/polkadot-sdk/raw/master/docs/images/Polkadot_Logo_Horizontal_Pink_Black.png#gh-light-mode-only"/> | ||
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> This is a template for creating a [parachain](https://wiki.polkadot.network/docs/learn-parachains) based on Polkadot SDK. | ||
> | ||
> This template is automatically updated after releases in the main [Polkadot SDK monorepo](https://github.com/paritytech/polkadot-sdk). | ||
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</div> | ||
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## Table of Contents | ||
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- [Intro](#intro) | ||
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- [Template Structure](#template-structure) | ||
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- [Getting Started](#getting-started) | ||
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- [Starting a Development Chain](#starting-a-development-chain) | ||
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- [Omni Node](#omni-node-prerequisites) | ||
- [Zombienet setup with Omni Node](#zombienet-setup-with-omni-node) | ||
- [Parachain Template Node](#parachain-template-node) | ||
- [Connect with the Polkadot-JS Apps Front-End](#connect-with-the-polkadot-js-apps-front-end) | ||
- [Takeaways](#takeaways) | ||
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- [Runtime development](#runtime-development) | ||
- [Contributing](#contributing) | ||
- [Getting Help](#getting-help) | ||
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## Intro | ||
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- ⏫ This template provides a starting point to build a [parachain](https://wiki.polkadot.network/docs/learn-parachains). | ||
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- ☁️ It is based on the | ||
[Cumulus](https://paritytech.github.io/polkadot-sdk/master/polkadot_sdk_docs/polkadot_sdk/cumulus/index.html) framework. | ||
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- 🔧 Its runtime is configured with a single custom pallet as a starting point, and a handful of ready-made pallets | ||
such as a [Balances pallet](https://paritytech.github.io/polkadot-sdk/master/pallet_balances/index.html). | ||
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- 👉 Learn more about parachains [here](https://wiki.polkadot.network/docs/learn-parachains) | ||
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## Template Structure | ||
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A Polkadot SDK based project such as this one consists of: | ||
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- 🧮 the [Runtime](./runtime/README.md) - the core logic of the parachain. | ||
- 🎨 the [Pallets](./pallets/README.md) - from which the runtime is constructed. | ||
- 💿 a [Node](./node/README.md) - the binary application, not part of the project default-members list and not compiled unless | ||
building the project with `--workspace` flag, which builds all workspace members, and is an alternative to | ||
[Omni Node](https://paritytech.github.io/polkadot-sdk/master/polkadot_sdk_docs/reference_docs/omni_node/index.html). | ||
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## Getting Started | ||
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- 🦀 The template is using the Rust language. | ||
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- 👉 Check the | ||
[Rust installation instructions](https://www.rust-lang.org/tools/install) for your system. | ||
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- 🛠️ Depending on your operating system and Rust version, there might be additional | ||
packages required to compile this template - please take note of the Rust compiler output. | ||
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Fetch parachain template code: | ||
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```sh | ||
git clone https://github.com/paritytech/polkadot-sdk-parachain-template.git parachain-template | ||
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cd parachain-template | ||
``` | ||
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## Starting a Development Chain | ||
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### Omni Node Prerequisites | ||
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[Omni Node](https://paritytech.github.io/polkadot-sdk/master/polkadot_sdk_docs/reference_docs/omni_node/index.html) can | ||
be used to run the parachain template's runtime. `polkadot-omni-node` binary crate usage is described at a high-level | ||
[on crates.io](https://crates.io/crates/polkadot-omni-node). | ||
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#### Install `polkadot-omni-node` | ||
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Please see the installation section at [`crates.io/omni-node`](https://crates.io/crates/polkadot-omni-node). | ||
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#### Build `parachain-template-runtime` | ||
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```sh | ||
cargo build --release | ||
``` | ||
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#### Install `staging-chain-spec-builder` | ||
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Please see the installation section at [`crates.io/staging-chain-spec-builder`](https://crates.io/crates/staging-chain-spec-builder). | ||
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#### Use `chain-spec-builder` to generate the `chain_spec.json` file | ||
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```sh | ||
chain-spec-builder create --relay-chain "rococo-local" --para-id <!-- docify::embed!("runtime/src/genesis_config_cmd_list_presets.rs", get_parachain_id)--> --runtime \ | ||
target/release/wbuild/parachain-template-runtime/parachain_template_runtime.wasm named-preset development | ||
``` | ||
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**Note**: the `relay-chain` and `para-id` flags are mandatory information required by | ||
Omni Node, and for parachain template case the value for `para-id` must be set to `{{PARACHAIN_ID}}`, since this | ||
is also the value injected through [ParachainInfo](https://docs.rs/staging-parachain-info/0.17.0/staging_parachain_info/) | ||
pallet into the `parachain-template-runtime`'s storage. The `relay-chain` value is set in accordance | ||
with the relay chain ID where this instantiation of parachain-template will connect to. | ||
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#### Run Omni Node | ||
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Start Omni Node with the generated chain spec. We'll start it in development mode (without a relay chain config), producing | ||
and finalizing blocks based on manual seal, configured below to seal a block with each second. | ||
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```bash | ||
polkadot-omni-node --chain <path/to/chain_spec.json> --dev --dev-block-time {{PARACHAIN_ID}} | ||
``` | ||
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However, such a setup is not close to what would run in production, and for that we need to setup a local | ||
relay chain network that will help with the block finalization. In this guide we'll setup a local relay chain | ||
as well. We'll not do it manually, by starting one node at a time, but we'll use [zombienet](https://paritytech.github.io/zombienet/intro.html). | ||
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Follow through the next section for more details on how to do it. | ||
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### Zombienet setup with Omni Node | ||
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Assuming we continue from the last step of the previous section, we have a chain spec and we need to setup a relay chain. | ||
We can install `zombienet` as described [here](https://paritytech.github.io/zombienet/install.html#installation), and | ||
`zombienet-omni-node.toml` contains the network specification we want to start. | ||
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#### Relay chain prerequisites | ||
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Download the `polkadot` (and the accompanying `polkadot-prepare-worker` and `polkadot-execute-worker`) binaries from | ||
[Polkadot SDK releases](https://github.com/paritytech/polkadot-sdk/releases). Then expose them on `PATH` like so: | ||
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```sh | ||
export PATH="$PATH:<path/to/binaries>" | ||
``` | ||
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#### Update `zombienet-omni-node.toml` with a valid chain spec path | ||
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```toml | ||
# ... | ||
[[parachains]] | ||
id = {{PARACHAIN_ID}} | ||
chain_spec_path = "<TO BE UPDATED WITH A VALID PATH>" | ||
# ... | ||
``` | ||
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#### Start the network | ||
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```sh | ||
zombienet --provider native spawn zombienet-omni-node.toml | ||
``` | ||
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### Parachain Template Node | ||
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As mentioned in the `Template Structure` section, the `node` crate is optionally compiled and it is an alternative | ||
to `Omni Node`. Similarly, it requires setting up a relay chain, and we'll use `zombienet` once more. | ||
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#### Install the `parachain-template-node` | ||
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```sh | ||
cargo install --path node | ||
``` | ||
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#### Setup and start the network | ||
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For setup, please consider the instructions for `zombienet` installation [here](https://paritytech.github.io/zombienet/install.html#installation) | ||
and [relay chain prerequisites](#relay-chain-prerequisites). | ||
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We're left just with starting the network: | ||
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```sh | ||
zombienet --provider native spawn zombienet.toml | ||
``` | ||
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### Connect with the Polkadot-JS Apps Front-End | ||
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- 🌐 You can interact with your local node using the | ||
hosted version of the Polkadot/Substrate Portal: | ||
[relay chain](https://polkadot.js.org/apps/#/explorer?rpc=ws://localhost:9944) | ||
and [parachain](https://polkadot.js.org/apps/#/explorer?rpc=ws://localhost:9988). | ||
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- 🪐 A hosted version is also | ||
available on [IPFS](https://dotapps.io/). | ||
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- 🧑🔧 You can also find the source code and instructions for hosting your own instance in the | ||
[`polkadot-js/apps`](https://github.com/polkadot-js/apps) repository. | ||
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### Takeaways | ||
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Development parachains: | ||
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- 🔗 Connect to relay chains, and we showcased how to connect to a local one. | ||
- 🧹 Do not persist the state. | ||
- 💰 Are preconfigured with a genesis state that includes several prefunded development accounts. | ||
- 🧑⚖️ Development accounts are used as validators, collators, and `sudo` accounts. | ||
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## Runtime development | ||
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We recommend using [`chopsticks`](https://github.com/AcalaNetwork/chopsticks) when the focus is more on the runtime | ||
development and `OmniNode` is enough as is. | ||
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### Install chopsticks | ||
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To use `chopsticks`, please install the latest version according to the installation [guide](https://github.com/AcalaNetwork/chopsticks?tab=readme-ov-file#install). | ||
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### Build a raw chain spec | ||
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Build the `parachain-template-runtime` as mentioned before in this guide and use `chain-spec-builder` | ||
again but this time by passing `--raw-storage` flag: | ||
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```sh | ||
chain-spec-builder create --raw-storage --relay-chain "rococo-local" --para-id {{PARACHAIN_ID}} --runtime \ | ||
target/release/wbuild/parachain-template-runtime/parachain_template_runtime.wasm named-preset development | ||
``` | ||
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### Start `chopsticks` with the chain spec | ||
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```sh | ||
npx @acala-network/chopsticks@latest --chain-spec <path/to/chain_spec.json> | ||
``` | ||
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### Alternatives | ||
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`OmniNode` can be still used for runtime development if using the `--dev` flag, while `parachain-template-node` doesn't | ||
support it at this moment. It can still be used to test a runtime in a full setup where it is started alongside a | ||
relay chain network (see [Parachain Template node](#parachain-template-node) setup). | ||
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## Contributing | ||
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- 🔄 This template is automatically updated after releases in the main [Polkadot SDK monorepo](https://github.com/paritytech/polkadot-sdk). | ||
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- ➡️ Any pull requests should be directed to this [source](https://github.com/paritytech/polkadot-sdk/tree/master/templates/parachain). | ||
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- 😇 Please refer to the monorepo's | ||
[contribution guidelines](https://github.com/paritytech/polkadot-sdk/blob/master/docs/contributor/CONTRIBUTING.md) and | ||
[Code of Conduct](https://github.com/paritytech/polkadot-sdk/blob/master/docs/contributor/CODE_OF_CONDUCT.md). | ||
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## Getting Help | ||
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- 🧑🏫 To learn about Polkadot in general, [Polkadot.network](https://polkadot.network/) website is a good starting point. | ||
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- 🧑🔧 For technical introduction, [here](https://github.com/paritytech/polkadot-sdk#-documentation) are | ||
the Polkadot SDK documentation resources. | ||
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- 👥 Additionally, there are [GitHub issues](https://github.com/paritytech/polkadot-sdk/issues) and | ||
[Substrate StackExchange](https://substrate.stackexchange.com/). | ||
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use polkadot_sdk::{staging_xcm as xcm, *}; | ||||||||||||||
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#[doc::include_str!("../../README.md")] | ||||||||||||||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. No need to include the README as a string here. This line can be removed. |
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#[cfg(feature = "generate-readme")] | ||||||||||||||
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There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. nit: empty line can be removed. |
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docify::compile_markdown!("../..","../.."); | ||||||||||||||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. I think this should be:
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use docify::{export, export_content}; | ||||||||||||||
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use cumulus_primitives_core::ParaId; | ||||||||||||||
use frame_support::build_struct_json_patch; | ||||||||||||||
use parachains_common::AuraId; | ||||||||||||||
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/// The default XCM version to set in genesis config. | ||||||||||||||
const SAFE_XCM_VERSION: u32 = xcm::prelude::XCM_VERSION; | ||||||||||||||
/// Parachain id used for genesis config presets of parachain template. | ||||||||||||||
pub const PARACHAIN_ID: u32 = 1000; | ||||||||||||||
#[export] | ||||||||||||||
pub const PARACHAIN_ID: u32 = 2000; | ||||||||||||||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Looks like a leftover committed while testing Readme recompilation. We can change it back to 1000. |
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/// Generate the session keys from individual elements. | ||||||||||||||
/// | ||||||||||||||
/// The input must be a tuple of individual keys (a single arg for now since we have just one key). | ||||||||||||||
pub fn template_session_keys(keys: AuraId) -> SessionKeys { | ||||||||||||||
SessionKeys { aura: keys } | ||||||||||||||
} | ||||||||||||||
#[docify::export(name = "get_parachain_id")] | ||||||||||||||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. How about using |
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pub fn get_parachain_id() -> u32 { | ||||||||||||||
PARACHAIN_ID | ||||||||||||||
} | ||||||||||||||
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There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. Thinking again about this, I would have this function return a plain Then, we can directly use the Last thing would be to run
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fn testnet_genesis( | ||||||||||||||
invulnerables: Vec<(AccountId, AuraId)>, | ||||||||||||||
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There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
How about adding a note at the beginning of this section where we embed the
PARACHAIN_ID
const (as it is declared in the rust code), withdocify::embed
, as described in these docs (https://docs.rs/docify/latest/docify/macro.compile_markdown.html)?This prepares the reader for these hardcoded values that will be used across the code base.