Fuel Rust SDK

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Chains

Icon LinkIncreasing the block height

You can use produce_blocks to help achieve an arbitrary block height; this is useful when you want to do any testing regarding transaction maturity.

Icon InfoCircle
Note: For the produce_blocks API to work, it is imperative to have manual_blocks_enabled = true in the config for the running node. See example below.

let wallets =
    launch_custom_provider_and_get_wallets(WalletsConfig::default(), None, None).await?;
let wallet = &wallets[0];
let provider = wallet.try_provider()?;
 
assert_eq!(provider.latest_block_height().await?, 0u32);
 
provider.produce_blocks(3, None).await?;
 
assert_eq!(provider.latest_block_height().await?, 3u32);

You can also set a custom block time as the second, optional argument. Here is an example:

let block_time = 20u32; // seconds
let config = Config {
    // This is how you specify the time between blocks
    block_production: Trigger::Interval {
        block_time: std::time::Duration::from_secs(block_time.into()),
    },
    ..Config::default()
};
let wallets =
    launch_custom_provider_and_get_wallets(WalletsConfig::default(), Some(config), None)
        .await?;
let wallet = &wallets[0];
let provider = wallet.try_provider()?;
 
assert_eq!(provider.latest_block_height().await?, 0u32);
let origin_block_time = provider.latest_block_time().await?.unwrap();
let blocks_to_produce = 3;
 
provider.produce_blocks(blocks_to_produce, None).await?;
assert_eq!(provider.latest_block_height().await?, blocks_to_produce);
let expected_latest_block_time = origin_block_time
    .checked_add_signed(Duration::seconds((blocks_to_produce * block_time) as i64))
    .unwrap();
assert_eq!(
    provider.latest_block_time().await?.unwrap(),
    expected_latest_block_time
);