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initial docify readme with some content #6333 #7093

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250 changes: 250 additions & 0 deletions templates/parachain/README.docify.md
Original file line number Diff line number Diff line change
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<div align="center">

# Polkadot SDK's Parachain Template

<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"/>

> 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).

</div>

## Table of Contents

- [Intro](#intro)

- [Template Structure](#template-structure)

- [Getting Started](#getting-started)

- [Starting a Development Chain](#starting-a-development-chain)

- [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)

- [Runtime development](#runtime-development)
- [Contributing](#contributing)
- [Getting Help](#getting-help)

## Intro

- ⏫ This template provides a starting point to build a [parachain](https://wiki.polkadot.network/docs/learn-parachains).

- ☁️ It is based on the
[Cumulus](https://paritytech.github.io/polkadot-sdk/master/polkadot_sdk_docs/polkadot_sdk/cumulus/index.html) framework.

- 🔧 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).

- 👉 Learn more about parachains [here](https://wiki.polkadot.network/docs/learn-parachains)

## Template Structure

A Polkadot SDK based project such as this one consists of:

- 🧮 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).

## Getting Started

- 🦀 The template is using the Rust language.

- 👉 Check the
[Rust installation instructions](https://www.rust-lang.org/tools/install) for your system.

- 🛠️ 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.

Fetch parachain template code:

```sh
git clone https://github.com/paritytech/polkadot-sdk-parachain-template.git parachain-template

cd parachain-template
```

## Starting a Development Chain
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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), with docify::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.


### Omni Node Prerequisites

[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).

#### Install `polkadot-omni-node`

Please see the installation section at [`crates.io/omni-node`](https://crates.io/crates/polkadot-omni-node).

#### Build `parachain-template-runtime`

```sh
cargo build --release
```

#### Install `staging-chain-spec-builder`

Please see the installation section at [`crates.io/staging-chain-spec-builder`](https://crates.io/crates/staging-chain-spec-builder).

#### Use `chain-spec-builder` to generate the `chain_spec.json` file

```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
```

**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.

#### Run Omni Node

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.

```bash
polkadot-omni-node --chain <path/to/chain_spec.json> --dev --dev-block-time {{PARACHAIN_ID}}
```

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).

Follow through the next section for more details on how to do it.

### Zombienet setup with Omni Node

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.

#### Relay chain prerequisites

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:

```sh
export PATH="$PATH:<path/to/binaries>"
```

#### Update `zombienet-omni-node.toml` with a valid chain spec path

```toml
# ...
[[parachains]]
id = {{PARACHAIN_ID}}
chain_spec_path = "<TO BE UPDATED WITH A VALID PATH>"
# ...
```

#### Start the network

```sh
zombienet --provider native spawn zombienet-omni-node.toml
```

### Parachain Template Node

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.

#### Install the `parachain-template-node`

```sh
cargo install --path node
```

#### Setup and start the network

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).

We're left just with starting the network:

```sh
zombienet --provider native spawn zombienet.toml
```

### Connect with the Polkadot-JS Apps Front-End

- 🌐 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).

- 🪐 A hosted version is also
available on [IPFS](https://dotapps.io/).

- 🧑‍🔧 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.

### Takeaways

Development parachains:

- 🔗 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.

## Runtime development

We recommend using [`chopsticks`](https://github.com/AcalaNetwork/chopsticks) when the focus is more on the runtime
development and `OmniNode` is enough as is.

### Install chopsticks

To use `chopsticks`, please install the latest version according to the installation [guide](https://github.com/AcalaNetwork/chopsticks?tab=readme-ov-file#install).

### Build a raw chain spec

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:

```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
```

### Start `chopsticks` with the chain spec

```sh
npx @acala-network/chopsticks@latest --chain-spec <path/to/chain_spec.json>
```

### Alternatives

`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).

## Contributing

- 🔄 This template is automatically updated after releases in the main [Polkadot SDK monorepo](https://github.com/paritytech/polkadot-sdk).

- ➡️ Any pull requests should be directed to this [source](https://github.com/paritytech/polkadot-sdk/tree/master/templates/parachain).

- 😇 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).

## Getting Help

- 🧑‍🏫 To learn about Polkadot in general, [Polkadot.network](https://polkadot.network/) website is a good starting point.

- 🧑‍🔧 For technical introduction, [here](https://github.com/paritytech/polkadot-sdk#-documentation) are
the Polkadot SDK documentation resources.

- 👥 Additionally, there are [GitHub issues](https://github.com/paritytech/polkadot-sdk/issues) and
[Substrate StackExchange](https://substrate.stackexchange.com/).


18 changes: 18 additions & 0 deletions templates/parachain/runtime/build.rs
Original file line number Diff line number Diff line change
@@ -1,9 +1,27 @@
use std::process::Command;

#[cfg(all(feature = "std", feature = "metadata-hash"))]
#[docify::export(template_enable_metadata_hash)]
fn main() {
println!("cargo:rerun-if-changed=../../parachain/runtime/src/genesis_config_presets.rs");
substrate_wasm_builder::WasmBuilder::init_with_defaults()
.enable_metadata_hash("UNIT", 12)
.build();
let docify_command = Command::new("cargo build")
.args(&["build"])
.current_dir("../../")
.output()
.expect("Failed to execute docify");

// Print the output of the docify command for debugging
println!("docify output: {:?}", docify_command);

println!("cargo:rerun-if-changed=../../parachain/runtime/src/genesis_config_presets.rs");

if !docify_command.status.success() {
eprintln!("Failed to run docify: {:?}", docify_command);
std::process::exit(1);
}
}

#[cfg(all(feature = "std", not(feature = "metadata-hash")))]
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14 changes: 13 additions & 1 deletion templates/parachain/runtime/src/genesis_config_presets.rs
Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,13 @@ use alloc::{vec, vec::Vec};

use polkadot_sdk::{staging_xcm as xcm, *};

#[doc::include_str!("../../README.md")]
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No need to include the README as a string here. This line can be removed.

#[cfg(feature = "generate-readme")]

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nit: empty line can be removed.

docify::compile_markdown!("../..","../..");
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I think this should be:

Suggested change
docify::compile_markdown!("../..","../..");
docify::compile_markdown!("../../README.docify.md","../../README.md");


use docify::{export, export_content};

use cumulus_primitives_core::ParaId;
use frame_support::build_struct_json_patch;
use parachains_common::AuraId;
Expand All @@ -17,14 +24,19 @@ use sp_keyring::Sr25519Keyring;
/// 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;
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Looks like a leftover committed while testing Readme recompilation. We can change it back to 1000.


/// 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")]
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How about using export_content instead of export? This way we're getting only the PARACHAIN_ID var name.

pub fn get_parachain_id() -> u32 {
PARACHAIN_ID
}
Comment on lines +37 to +39
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Thinking again about this, I would have this function return a plain 1000 (such that it corresponds with the cost PARACHAIN_ID). We should follow with a test that asserts PARACHAIN_ID == get_parachain_id(). Might sound redundant, but this is to overcome the lack of docify support around interpolating exported primitive constants by value directly into the README.

Then, we can directly use the get_parachain_id tag in the README.docify.md to interpolate 1000 into the doc wherever it is needed. I haven't tried this though, I have a slight concern it might not work everywhere.

Last thing would be to run cargo build --features generate-readme to trigger the README.md compilation, based on the README.docify.md file.

Suggested change
pub fn get_parachain_id() -> u32 {
PARACHAIN_ID
}
const fn get_parachain_id() -> u32 {
1000
}


fn testnet_genesis(
invulnerables: Vec<(AccountId, AuraId)>,
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