Writing On-Chain Code
This section shows you how to write session code and smart contracts in Rust and WebAssembly (Wasm) for a Casper network. When referring to session code, these documents outline logic that executes in the context of an account. In contrast, smart contracts consist of logic installed on-chain, for use by multiple parties. There is a large overlap between the processes of writing session code versus contract code, with some semantic differences outlined in their respective documentation. The Video Series for Writing On-Chain Code accompanies the topics below.
| Title | Description |
|---|---|
| Getting Started with Rust | An introduction to using Rust with the Casper Platform |
| Getting Started with AssemblyScript | An introduction to using AssemblyScript with the Casper Platform |
| Writing a Basic Smart Contract in Rust | An example of a smart contract built in Rust |
| Unit Testing Smart Contracts | Steps to test contract code using the unit testing framework |
| Upgrading and Maintaining Smart Contracts | An introduction to versioning smart contracts |
| Calling Contracts | |
| Smart Contracts and Session Code | Understand what session code is and when you would use it over contract code |
| Writing Session Code | An introduction to writing session code |
| Unit Testing Session Code | Steps to test session code using the unit testing framework |
| Contract-Level Events | Enabling smart contracts to emit messages while executing on the blockchain |
| Using Contract Hash vs. Package Hash | Advantages and disadvantages of using contract_hash vs. contract_package_hash when calling a contract |
| The Factory Pattern for Smart Contracts | Learn to implement the contract factory pattern on a Casper network |
| Best Practices for Casper Smart Contract Authors | An outline of best practices when developing smart contracts on a Casper network |
Interacting with Contracts on the Blockchain
Additionally, the section on Interacting with the Blockchain covers installing and calling contracts using the Casper command-line client written in Rust.
| Title | Description |
|---|---|
| Installing Smart Contracts and Querying Global State | A guide on installing smart contracts and querying global state |
| Calling Smart Contracts with the Rust Client | Steps to call a smart contract with the Rust command-line client |
| Reading and Writing to Dictionaries | Information on Dictionaries and how to read and write to them on the Casper Platform. |
| Execution Error Codes | Possible error codes when writing smart contracts. |
Tutorials
The following tutorials outline some aspects of writing smart contracts on a Casper network.
| Title | Description |
|---|---|
| Getting Started Video | Step-by-step video tutorial for setting up the Casper development environment |
| A Counter on the Testnet | An example contract that maintains a counter variable on the Casper Testnet |
| Smart Contract Upgrades | Learn how to upgrade smart contracts |
| NFTs on Casper with the CEP-78 NFT Standard | Implementing the Casper CEP-78 NFT standard |
| Fungible Tokens on Casper | Implement the Casper Fungible Token standard |
| Interacting with Runtime Return Values | Learning how to return a value using contract code |
| Working with Authorization Keys | Retrieving and using the authorization keys associated with a transaction |
| Safely Transfer Tokens to a Contract | How to handle tokens via a contract |