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LegacyBlockSub

avail_rust_client::subscription::block

Struct LegacyBlockSub 

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

Subscription wrapper that streams LegacyBlock values.

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impl LegacyBlockSub

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pub fn new(client: Client) -> Self

Creates a subscription that yields legacy blocks as you iterate.

The client is cloned and no network traffic occurs until LegacyBlockSub::next or LegacyBlockSub::prev is awaited.

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

Returns a LegacyBlockSub ready to iterate over legacy blocks.

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

Fetches the next legacy block; rewinds the cursor if the RPC call fails.

§Returns
  • Ok(Some(LegacyBlock)) when the node provides a block for the current cursor.
  • Ok(None) when the block exists but contains no legacy payload.
  • Err(RpcError) when the RPC call fails; the internal block height resets so a retry will reattempt the same block.
§Errors

Returns Err(RpcError) when the underlying RPC request fails.

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

Fetches the previous legacy block; rewinds the cursor if the RPC call fails.

The result semantics mirror LegacyBlockSub::next.

§Returns
  • Ok(Some(LegacyBlock)) when the previous block is available.
  • Ok(None) when the block exists but contains no legacy payload.
  • Err(RpcError) when the RPC call fails and the cursor is rewound.
§Errors

Returns Err(RpcError) when the underlying RPC request fails.

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pub fn should_retry_on_error(&self) -> bool

Reports whether the subscription retries after RPC failures.

§Returns

Returns true when retries are enabled, otherwise false.

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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 following the chain 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 LegacyBlockSub

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fn clone(&self) -> LegacyBlockSub

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more

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