Directory structure

After creating a new project using Odra and running the tests, you will be presented with the following files and directories:

.
├── Cargo.lock
├── Cargo.toml
├── CHANGELOG.md
├── Odra.toml
├── README.md
├── rust-toolchain
├── src/
│   ├── flipper.rs
│   └── lib.rs
├── bin/
|   |── build_contract.rs
|   └── build_schema.rs
├── target/
└── wasm/

Cargo.toml

Let's first take a look at Cargo.toml file:

[package]
name = "sample"
version = "0.1.0"
edition = "2021"

[dependencies]
odra = "0.8.1"

[dev-dependencies]
odra-test = "0.8.1"

[[bin]]
name = "sample_build_contract"
path = "bin/build_contract.rs"
test = false

[[bin]]
name = "sample_build_schema"
path = "bin/build_schema.rs"
test = false

[profile.release]
codegen-units = 1
lto = true

[profile.dev.package."*"]
opt-level = 3

By default, your project will use the latest odra version available at crates.io. For testing purposes, odra-test is also added as a dev dependency.

Odra.toml

This is the file that holds information about contracts that will be generated when running cargo odra build and cargo odra test:

[[contracts]]
fqn = "sample::Flipper"

As we can see, we have a single contract, its fqn (Fully Qualified Name) corresponds to the contract is located in src/flipper.rs. More contracts can be added here by hand, or by using cargo odra generate command.

src/

This is the folder where your smart contract files live.

bin/

This is the folder where scripts that will be used to generate code or schemas live. You don't need to modify those files, they are generated by cargo odra new command and are used by cargo odra build, cargo odra test and cargo odra schema commands.

target/

Files generated by cargo during the build process are put here.

wasm/

WASM files generated by cargo odra build and cargo odra test are put here. You can grab those WASM files and deploy them on the blockchain.

What's next

Now, let's take a look at one of the files mentioned above in more detail, namely the Odra.toml file.