BlockSub

avail_rust_client::subscription::block

Struct BlockSub 

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pub struct BlockSub { /* private fields */ }
Expand description

Subscription wrapper that streams block handles (Block).

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impl BlockSub

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pub fn new(client: Client) -> Self

Creates a subscription that yields Block handles as you iterate. The handlers can be used to inspect extrinsics, events, or raw data.

§Arguments
  • client - Client used to drive the subscription.
§Returns

Returns a BlockSub ready to iterate over blocks.

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pub async fn next(&mut self) -> Result<BlockSubValue, RpcError>

Fetches the next block handle along with its BlockInfo.

§Returns
  • Ok(BlockSubValue) when a block is available at the current cursor.
  • Err(RpcError) when the underlying subscription fails to advance.
§Errors

Returns Err(RpcError) when fetching the next block fails.

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pub async fn prev(&mut self) -> Result<BlockSubValue, RpcError>

Fetches the previous block handle along with its BlockInfo.

Return semantics mirror BlockSub::next.

§Returns

Returns the previous block handle and metadata, or Err(RpcError) on failure.

§Errors

Returns Err(RpcError) when fetching the previous block fails.

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pub fn should_retry_on_error(&self) -> bool

Reports whether failed RPC calls will be retried.

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pub fn use_best_block(&mut self, value: bool)

Follow best blocks instead of finalized ones.

§Arguments
  • value - true to follow best blocks, false for finalized blocks.
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pub fn set_block_height(&mut self, block_height: u32)

Jump the cursor to a specific starting height.

§Arguments
  • block_height - Height used as the starting point for iteration.
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pub fn set_pool_rate(&mut self, value: Duration)

Change how often we poll for new blocks when tailing the head.

§Arguments
  • value - Poll interval used while tailing the head.
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pub fn set_retry_on_error(&mut self, value: Option<bool>)

Controls retry behaviour: Some(true) forces retries, Some(false) disables them, and None keeps the client’s default.

§Arguments
  • value - Retry override applied to the underlying subscription.

Trait Implementations§

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impl Clone for BlockSub

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fn clone(&self) -> BlockSub

Returns a duplicate of the value. Read more
1.0.0 · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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