Running scripts

You can run a script using its JSON-ABI and the path to its binary file. You can run the scripts with arguments. For this, you have to use the abigen! macro seen previously.

    // The abigen is used for the same purpose as with contracts (Rust bindings)
    abigen!(Script(
        name = "MyScript",
        abi = "packages/fuels/tests/scripts/arguments/out/debug/arguments-abi.json"
    ));
    let wallet = launch_provider_and_get_wallet().await?;
    let bin_path = "../fuels/tests/scripts/arguments/out/debug/arguments.bin";
    let script_instance = MyScript::new(wallet, bin_path);

    let bim = Bimbam { val: 90 };
    let bam = SugarySnack {
        twix: 100,
        mars: 1000,
    };

    let result = script_instance.main(bim, bam).call().await?;

    let expected = Bimbam { val: 2190 };
    assert_eq!(result.value, expected);

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

    let submitted_tx = script_instance.main(my_struct).submit().await?;
    let value = submitted_tx.response().await?.value;

Running scripts with transaction policies

The method for passing transaction policies is the same as with contracts. As a reminder, the workflow would look like this:

    let tx_policies = TxPolicies::default().with_script_gas_limit(1_000_000);
    let result = script_instance
        .main(a, b)
        .with_tx_policies(tx_policies)
        .call()
        .await?;

Logs

Script calls provide the same logging functions, decode_logs() and decode_logs_with_type<T>(), as contract calls. As a reminder, the workflow looks like this:

    abigen!(Script(
        name = "log_script",
        abi = "packages/fuels/tests/logs/script_logs/out/debug/script_logs-abi.json"
    ));

    let wallet = launch_provider_and_get_wallet().await?;
    let bin_path = "../fuels/tests/logs/script_logs/out/debug/script_logs.bin";
    let instance = log_script::new(wallet.clone(), bin_path);

    let response = instance.main().call().await?;

    let logs = response.decode_logs();
    let log_u64 = response.decode_logs_with_type::<u64>()?;

Calling contracts from scripts

Scripts use the same interfaces for setting external contracts as contract methods.

Below is an example that uses with_contracts(&[&contract_instance, ...]).

    let response = script_instance
        .main(contract_id)
        .with_contracts(&[&contract_instance])
        .call()
        .await?;

And this is an example that uses with_contract_ids(&[&contract_id, ...]).

    let response = script_instance
        .main(contract_id)
        .with_contract_ids(&[contract_id.into()])
        .call()
        .await?;

Configurable constants

Same as contracts, you can define configurable constants in scripts which can be changed during the script execution. Here is an example how the constants are defined.

script;

#[allow(dead_code)]
enum EnumWithGeneric<D> {
    VariantOne: D,
    VariantTwo: (),
}

#[allow(dead_code)]
struct StructWithGeneric<D> {
    field_1: D,
    field_2: u64,
}

configurable {
    U8: u8 = 8u8,
    BOOL: bool = true,
    ARRAY: [u32; 3] = [253u32, 254u32, 255u32],
    STR_4: str[4] = __to_str_array("fuel"),
    STRUCT: StructWithGeneric<u8> = StructWithGeneric {
        field_1: 8u8,
        field_2: 16,
    },
    ENUM: EnumWithGeneric<bool> = EnumWithGeneric::VariantOne(true),
}

fn main() -> (u8, bool, [u32; 3], str[4], StructWithGeneric<u8>, EnumWithGeneric<bool>) {
    (U8, BOOL, ARRAY, STR_4, STRUCT, ENUM)
}

Each configurable constant will get a dedicated with method in the SDK. For example, the constant STR_4 will get the with_STR_4 method which accepts the same type defined in sway. Below is an example where we chain several with methods and execute the script with the new constants.

    abigen!(Script(name="MyScript", abi="packages/fuels/tests/scripts/script_configurables/out/debug/script_configurables-abi.json"));

    let wallet = launch_provider_and_get_wallet().await?;
    let bin_path = "../fuels/tests/scripts/script_configurables/out/debug/script_configurables.bin";
    let instance = MyScript::new(wallet, bin_path);

    let new_str: SizedAsciiString<4> = "FUEL".try_into()?;
    let new_struct = StructWithGeneric {
        field_1: 16u8,
        field_2: 32,
    };
    let new_enum = EnumWithGeneric::VariantTwo;

    let configurables = MyScriptConfigurables::new(EncoderConfig {
        max_tokens: 5,
        ..Default::default()
    })
    .with_STR_4(new_str.clone())?
    .with_STRUCT(new_struct.clone())?
    .with_ENUM(new_enum.clone())?;

    let response = instance
        .with_configurables(configurables)
        .main()
        .call()
        .await?;