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Counter Contract Tutorial

This repository include a example implementaion of Rust contract with NEAR-SDK, a contract which use basic contract, versioned and upgradeable contract

Prerequisites

If you're using Gitpod, you can skip this step.

  • Make sure Rust is installed per the prerequisites in near-sdk-rs.
  • Make sure near-cli is installed.

Building this contract

Run the following, and we'll build our rust project up via cargo. This will generate our WASM binaries into our out/ directory. This is the smart contract we'll be deploying onto the NEAR blockchain later.

./build.sh

Testing this contract

We have some tests that you can run. For example, the following will run our simple tests to verify that our contract code is working.

cargo test -- --nocapture

The more complex simulation tests aren't run with this command, but we can find them in tests/sim.

Using this contract

Quickest deploy

You can build and deploy this smart contract to a development account. Dev Accounts are auto-generated accounts to assist in developing and testing smart contracts. Please see the Standard deploy section for creating a more personalized account to deploy to.

near dev-deploy --wasmFile out/counter-tutorial.wasm

Behind the scenes, this is creating an account and deploying a contract to it. On the console, notice a message like:

Done deploying to dev-1234567890123

In this instance, the account is dev-1234567890123. A file has been created containing a key pair to the account, located at neardev/dev-account. To make the next few steps easier, we're going to set an environment variable containing this development account id and use that when copy/pasting commands. Run this command to set the environment variable:

source neardev/dev-account.env

You can tell if the environment variable is set correctly if your command line prints the account name after this command:

echo $CONTRACT_NAME

The next command will initialize the contract using the new method:

near call $CONTRACT_NAME new --accountId $ACCOUNT_NAME

To view the number in contract:

near view $CONTRACT_NAME get_num

To increment number

near call $CONTRACT_NAME increment --accountId $ACCOUNT_NAME