feat: add config and messaging base of contracts

.tool-versions

@@ -1,2 +1,2 @@
-scarb 2.5.0
+scarb 2.4.4
 starknet-foundry 0.16.0

README.md

@@ -1,17 +1,31 @@
 <div align="center">
   <img src="book/src/assets/piltover.png" height="300"/>
 
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 </div>
 
 ## Overview
 
 Starknet Core Contract components in Cairo.
 
+## Repository architecture
+
+The different tasks of the Starknet Core Contract are here mapped to what we can call an "Appchain" Core Contract.
+
+The functionalities of the core contract are split over several components. Each component is usually placed into a directory, event if it is simple. Doing so allow a good separation of additional files that may be written in the context of a component.
+
+Due to a limitation of `starknet foundry`, we can't declare a contract that is defined under the `tests` directory. For this reason, `mock` contract are defined in their respective component location. This is also a good way for the component write to illustrate the minimum required to use the component.
+
+- `appchain.cairo`: core contract of the appchain on Starknet.
+
+- `config`: base configuration for the core contract.
+
+- `messaging`: messaging between Appchain - Starknet.
+
 ## Build
 
 To build the project, run:
@@ -27,3 +41,36 @@ To test the project, run:
 ```bash
 snforge test
 ```
+
+## Code style (cairo)
+
+- Use `snake_case` for module name and not `PascalCase`.
+
+- Don't import directly a function from a module.
+
+```rust
+// Prefer that:
+let addr = starknet::contract_address_const::<0>();
+
+// Instead of:
+use starknet::contract_address_const;
+let addr = contract_address_const::<0>();
+```
+
+- Order import as much as you can (and avoid relative import, if not inside tests).
+
+```rust
+// Core or built-in plugins like starknet.
+use starknet::...;
+
+// Third party modules
+use openzeppelin::...;
+
+// Package
+use piltover::...;
+
+// Relative
+super::...;
+```
+
+- Document functions inside the trait, and add details if needed in the implementation.

Scarb.lock

@@ -1,10 +1,16 @@
 # Code generated by scarb DO NOT EDIT.
 version = 1
 
+[[package]]
+name = "openzeppelin"
+version = "0.8.1"
+source = "git+https://github.com/OpenZeppelin/cairo-contracts.git?tag=v0.8.1#5c7a022f333dca721fe490c2191a811fa2566a89"
+
 [[package]]
 name = "piltover"
 version = "0.1.0"
 dependencies = [
+ "openzeppelin",
  "snforge_std",
 ]
 

Scarb.toml

@@ -5,7 +5,9 @@ edition = "2023_10"
 
 [dependencies]
 snforge_std = { git = "https://github.com/foundry-rs/starknet-foundry", tag = "v0.16.0" }
-starknet = "2.5.0"
+starknet = "=2.4.4"
+openzeppelin = { git = "https://github.com/OpenZeppelin/cairo-contracts.git", tag = "v0.8.1" }
 
 [[target.starknet-contract]]
 casm = true
+sierra = true

src/appchain.cairo

@@ -0,0 +1,51 @@
+//! SPDX-License-Identifier: MIT
+//!
+//!
+
+mod errors {
+    const INVALID_ADDRESS: felt252 = 'Config: invalid address';
+}
+
+/// Appchain settlement contract on starknet.
+#[starknet::contract]
+mod appchain {
+    use starknet::ContractAddress;
+    use openzeppelin::access::ownable::{OwnableComponent as ownable_cpt, interface::IOwnable};
+
+    use piltover::config::{config_cpt, config_cpt::InternalTrait as ConfigInternal, IConfig};
+
+    component!(path: ownable_cpt, storage: ownable, event: OwnableEvent);
+    component!(path: config_cpt, storage: config, event: ConfigEvent);
+
+    #[abi(embed_v0)]
+    impl ConfigImpl = config_cpt::ConfigImpl<ContractState>;
+
+    #[storage]
+    struct Storage {
+        #[substorage(v0)]
+        ownable: ownable_cpt::Storage,
+        #[substorage(v0)]
+        config: config_cpt::Storage,
+    }
+
+    #[event]
+    #[derive(Drop, starknet::Event)]
+    enum Event {
+        #[flat]
+        OwnableEvent: ownable_cpt::Event,
+        #[flat]
+        ConfigEvent: config_cpt::Event,
+    }
+
+    /// Initializes the contract.
+    ///
+    /// # Arguments
+    ///
+    /// * `address` - The contract address of the owner.
+    #[constructor]
+    fn constructor(ref self: ContractState, owner: ContractAddress) {
+        self.ownable.transfer_ownership(owner);
+
+        assert(self.config.is_owner_or_operator(owner), 'bad');
+    }
+}

src/config/component.cairo

@@ -0,0 +1,102 @@
+//! SPDX-License-Identifier: MIT
+//!
+//! Base configuration for appchain contract.
+
+/// Errors.
+mod errors {
+    const INVALID_CALLER: felt252 = 'Config: not owner or operator';
+}
+
+/// Configuration component.
+///
+/// Depends on `ownable` to ensure the configuration is
+/// only editable by contract's owner.
+#[starknet::component]
+mod config_cpt {
+    use starknet::ContractAddress;
+
+    use openzeppelin::access::ownable::{
+        OwnableComponent as ownable_cpt, OwnableComponent::InternalTrait as OwnableInternal,
+        interface::IOwnable,
+    };
+
+    use piltover::config::interface::IConfig;
+
+    use super::errors;
+
+    #[storage]
+    struct Storage {
+        /// Appchain operator that is allowed to update the state.
+        operator: ContractAddress,
+        /// Program info (StarknetOS), with program hash and config hash.
+        program_info: (felt252, felt252),
+        /// Facts registry contract address.
+        facts_registry: ContractAddress,
+    }
+
+    #[embeddable_as(ConfigImpl)]
+    impl Config<
+        TContractState,
+        +HasComponent<TContractState>,
+        impl Ownable: ownable_cpt::HasComponent<TContractState>,
+        +Drop<TContractState>
+    > of IConfig<ComponentState<TContractState>> {
+        fn set_operator(ref self: ComponentState<TContractState>, address: ContractAddress) {
+            get_dep_component!(self, Ownable).assert_only_owner();
+            self.operator.write(address)
+        }
+
+        fn get_operator(self: @ComponentState<TContractState>) -> ContractAddress {
+            self.operator.read()
+        }
+
+        fn set_program_info(
+            ref self: ComponentState<TContractState>, program_hash: felt252, config_hash: felt252
+        ) {
+            self.assert_only_owner_or_operator();
+            self.program_info.write((program_hash, config_hash))
+        }
+
+        fn get_program_info(self: @ComponentState<TContractState>) -> (felt252, felt252) {
+            self.program_info.read()
+        }
+
+        fn set_facts_registry(ref self: ComponentState<TContractState>, address: ContractAddress) {
+            self.assert_only_owner_or_operator();
+            self.facts_registry.write(address)
+        }
+
+        fn get_facts_registry(self: @ComponentState<TContractState>) -> ContractAddress {
+            self.facts_registry.read()
+        }
+    }
+
+    #[generate_trait]
+    impl InternalImpl<
+        TContractState,
+        +HasComponent<TContractState>,
+        impl Ownable: ownable_cpt::HasComponent<TContractState>,
+        +Drop<TContractState>
+    > of InternalTrait<TContractState> {
+        /// Asserts if the caller is the owner of the contract or
+        /// the authorized operator. Reverts otherwise.
+        fn assert_only_owner_or_operator(ref self: ComponentState<TContractState>) {
+            assert(
+                self.is_owner_or_operator(starknet::get_caller_address()), errors::INVALID_CALLER
+            );
+        }
+
+        /// Verifies if the given address is the owner of the contract
+        /// or the authorized operator.
+        ///
+        /// # Arguments
+        ///
+        /// * `address` - The contrat address to verify.
+        fn is_owner_or_operator(
+            ref self: ComponentState<TContractState>, address: ContractAddress
+        ) -> bool {
+            let owner = get_dep_component!(self, Ownable).owner();
+            address == owner || address == self.operator.read()
+        }
+    }
+}

src/config/interface.cairo

@@ -0,0 +1,53 @@
+//! SPDX-License-Identifier: MIT
+//!
+//! Interface for appchain settlement contract configuration.
+use starknet::ContractAddress;
+
+#[starknet::interface]
+trait IConfig<T> {
+    /// Sets the operator that is in charge to push state updates.
+    ///
+    /// # Arguments
+    ///
+    /// * `address` - The operator account address.
+    fn set_operator(ref self: T, address: ContractAddress);
+
+    /// Gets the operator address.
+    ///
+    /// # Returns
+    ///
+    /// The operator's address.
+    fn get_operator(self: @T) -> ContractAddress;
+
+    /// Sets the information of the program that generates the
+    /// state transition trace (namely StarknetOS).
+    ///
+    /// # Arguments
+    ///
+    /// * `program_hash` - The program hash.
+    /// * `config_hash` - The program's config hash.
+    fn set_program_info(ref self: T, program_hash: felt252, config_hash: felt252);
+
+    /// Gets the information of the program that generates the
+    /// state transition trace (namely StarknetOS).
+    ///
+    /// # Returns
+    ///
+    /// The program hash and it's configuration hash.
+    fn get_program_info(self: @T) -> (felt252, felt252);
+
+    /// Sets the facts registry contract address, which is already
+    /// initialized with the verifier information.
+    ///
+    /// # Arguments
+    ///
+    /// * `address` - The facts registry contract's address.
+    fn set_facts_registry(ref self: T, address: ContractAddress);
+
+    /// Gets the facts registry contract address.
+    ///
+    /// # Returns
+    ///
+    /// The contract address of the facts registry.
+    fn get_facts_registry(self: @T) -> ContractAddress;
+}

src/config/mock.cairo

@@ -0,0 +1,38 @@
+#[starknet::contract]
+mod config_mock {
+    use starknet::ContractAddress;
+
+    use openzeppelin::access::ownable::{
+        OwnableComponent as ownable_cpt, OwnableComponent::InternalTrait as OwnableInternal
+    };
+
+    use piltover::config::{config_cpt, config_cpt::InternalTrait as ConfigInternal, IConfig};
+
+    component!(path: ownable_cpt, storage: ownable, event: OwnableEvent);
+    component!(path: config_cpt, storage: config, event: ConfigEvent);
+
+    #[abi(embed_v0)]
+    impl ConfigImpl = config_cpt::ConfigImpl<ContractState>;
+
+    #[storage]
+    struct Storage {
+        #[substorage(v0)]
+        ownable: ownable_cpt::Storage,
+        #[substorage(v0)]
+        config: config_cpt::Storage
+    }
+
+    #[event]
+    #[derive(Drop, starknet::Event)]
+    enum Event {
+        #[flat]
+        OwnableEvent: ownable_cpt::Event,
+        #[flat]
+        ConfigEvent: config_cpt::Event
+    }
+
+    #[constructor]
+    fn constructor(ref self: ContractState, owner: ContractAddress) {
+        self.ownable.initializer(owner);
+    }
+}