Calling contracts

Once you've deployed your contract, as seen in the previous sections, you'll likely want to:

1. Call contract methods;
2. Configure call parameters and transaction policies;
3. Forward coins and gas in your contract calls;
4. Read and interpret returned values and logs.

Here's an example. Suppose your Sway contract has two ABI methods called initialize_counter(u64) and increment_counter(u64). Once you've deployed it the contract, you can call these methods like this:

        // This will generate your contract's methods onto `MyContract`.
        // This means an instance of `MyContract` will have access to all
        // your contract's methods that are running on-chain!
        abigen!(Contract(
            name = "MyContract",
            abi = "packages/fuels/tests/contracts/contract_test/out/debug/contract_test-abi.json"
        ));

        // This is an instance of your contract which you can use to make calls to your functions
        let contract_instance = MyContract::new(contract_id_2, wallet);

        let response = contract_instance
            .methods()
            .initialize_counter(42) // Build the ABI call
            .call() // Perform the network call
            .await?;

        assert_eq!(42, response.value);

        let response = contract_instance
            .methods()
            .increment_counter(10)
            .call()
            .await?;

        assert_eq!(52, response.value);

The example above uses all the default configurations and performs a simple contract call.

Furthermore, if you need to separate submission from value retrieval for any reason, you can do so as follows:

        let response = contract_instance
            .methods()
            .initialize_counter(42)
            .submit()
            .await?;

        let value = response.response().await?.value;

Next, we'll see how we can further configure the many different parameters in a contract call.