This Rust project implements a canister for managing suppliers, clients, and orders within the context of the Internet Computer (IC). The canister exposes functions for querying and updating data related to clients, suppliers, and orders. It utilizes the ic_cdk framework, and the data is stored in a thread-local storage structure (StableBTreeMap) managed by a MemoryManager.

• Rust
• Internet Computer SDK
• IC CDK

1. Clone the repository:

   git clone https://github.com/Collins-Ruto/supply-chain.git
   cd supply-chain

The core data structures are defined as Rust structs:

#[derive(CandidType, etc)]
struct Client {
  id: u64,
  name: String,
  // etc
}

#[derive(CandidType, etc)]  
struct Supplier {
  // fields 
}

#[derive(CandidType, etc)]
struct Order {
  // fields
}

Each record contains relevant fields like IDs, names and timestamps.

Memory is allocated using a MemoryManager from the ic-stable-structures crate:

static MEMORY_MANAGER: RefCell<MemoryManager<DefaultMemoryImpl>> = // initialized

This manages allocating VirtualMemory for storages.

Unique IDs are generated using a thread-local IdCell:

static ID_COUNTER: RefCell<IdCell> = // initialized

The counter is incremented when adding new records.

Records are stored in thread-local StableBTreeMaps:

static CLIENT_STORAGE: RefCell<StableBTreeMap<u64, Client>> = // initialized

static SUPPLIER_STORAGE: RefCell<StableBTreeMap<u64, Supplier>> = // initialized

static ORDERS: RefCell<StableBTreeMap<u64, Order>> = // initialized 

This provides fast random access to records.

The Storable and BoundedStorable traits are implemented for serialization and bounding record sizes during storage.

Query and update functions are defined using attributes:

#[ic_cdk::query]
fn get_client(id: u64) -> Result<Client, Error> {
  // ...
}

#[ic_cdk::update]
fn add_order(payload: OrderPayload) -> Option<Order> {
  // ...
}

This exposes a Candid API.

add_client(payload: ClientPayload) -> Option<Client>
Creates a new client based on the provided payload and adds it to the client storage. Returns the created client if successful.

add_supplier(payload: SupplierPayload) -> Option<Supplier>
Creates a new supplier based on the provided payload and adds it to the supplier storage. Returns the created supplier if successful.

add_order(payload: OrderPayload) -> Option<Order>
Creates a new order based on the provided payload and adds it to the order storage. Returns the created order if successful.

add_order_supplier(id: u64, supplier_id: u64) -> Result<Order, Error>
Associates a supplier with an existing order identified by the given ID. Returns the updated order if successful, otherwise returns a NotFound error if the order is not found.

complete_order(id: u64) -> Result<Order, Error>
Marks an order as complete based on the provided ID. Returns the completed order if successful, otherwise returns a NotFound error if the order is not found.

update_order(id: u64, payload: OrderPayload) -> Option<Order>
Updates the information of an existing order identified by the given ID with the provided payload. Returns the updated order if successful.

delete_order(id: u64) -> Result<Order, Error>
Deletes an order based on the provided ID. Returns the deleted order if successful, otherwise returns a NotFound error if the order is not found.

Private helper functions handle data access:

fn _get_client(id: &u64) -> Option<Client> {
  // lookup client
}

fn _insert_client(client: &Client) {
  // insert into storage
}

The Error enum captures errors from record lookups.

This provides a full-featured in-memory database with types and interfaces to manage orders, clients, and suppliers through a thread-safe Rust implementation.

This canister provides functionality for managing clients, suppliers, and orders through a set of query and update functions. See the Functions section for details on available operations.

If you want to start working on your project right away, you might want to try the following commands:

cd supply_chain/
dfx help
dfx canister --help

If you want to test your project locally, you can use the following commands:

# Starts the replica, running in the background
dfx start --background

# Deploys your canisters to the replica and generates your candid interface
dfx deploy

Once the job completes, your application will be available at http://localhost:4943?canisterId={asset_canister_id}.

If you have made changes to your backend canister, you can generate a new candid interface with

npm run generate

at any time. This is recommended before starting the frontend development server, and will be run automatically any time you run dfx deploy.

If you are making frontend changes, you can start a development server with

npm start

Which will start a server at http://localhost:8080, proxying API requests to the replica at port 4943.

To learn more before you start working with supply_chain, see the following documentation available online:

• Quick Start
• SDK Developer Tools
• Rust Canister Devlopment Guide
• ic-cdk
• ic-cdk-macros
• Candid Introduction
• JavaScript API Reference