pallet-witnet-oracle

pallet-witnet-oracle

A (rather centralized for now) substrate pallet that enables sending data requests to the Witnet oracle from any Polkadot or Kusama parachain, as well as getting the results of the requests relayed back.

Usage

Use it from a different pallet

In the [dependencies] section of the Cargo.toml file of the pallet in your working directory, add:

pallet-witnet-oracle = { default-features = false, git = "https://github.com/aesedepece/witnet-polkadot.git" }

Inside [features] > std = [ ... ] in Cargo.toml:

'pallet-witnet-oracle/std',

In your configuration trait, create a type that is bound by pallet_witnet_oracle::Config type (in src/lib.rs):

pub trait MyPalletConfig: frame_system::Config {
    type WitnetOracle: pallet_witnet_oracle::Pallet<pallet_witnet_oracle::Pallet::Config>;
}

Add it to your own parachain

As with any other pallet, adding it to your parachain is pretty straightforward and only requires adding a few lines here and there.

Inside [dependencies] in runtime/Cargo.toml and node/Cargo.toml:

pallet-witnet-oracle = { default-features = false, git = "https://github.com/aesedepece/witnet-polkadot.git" }

Inside [features] > std = [ ... ] in runtime/Cargo.toml:

'pallet-witnet-oracle/std',

In runtime/src/lib.rs:

parameter_types! {
	pub const MaxWitnetByteSize: u16 = 2048;
}

impl pallet_witnet_oracle::Config for Runtime {
    type Event = Event;
    type Currency = Balances;
    type MaxByteSize = MaxWitnetByteSize;
    type TimeProvider = pallet_timestamp::Pallet<Test>;
}

Inside construct_runtime! in runtime/src/lib.rs as well:

Witnet: pallet_witnet_oracle,

Finally, inside testnet_genesis (or equivalent if mainnet) in your node/src/chain_spec.rs:

witnet: WitnetConfig {
    // Use the first account (aka Alice) as the sole operator by default
    operators: endowed_accounts.iter().cloned().take(1).collect()
}