Function ic_ledger_types::query_blocks

pub async fn query_blocks(
    ledger_canister_id: Principal,
    args: GetBlocksArgs
) -> CallResult<QueryBlocksResponse>

Calls the “query_block” method on the specified canister.

Example

use candid::Principal;
use ic_cdk::api::call::CallResult;
use ic_ledger_types::{BlockIndex, Block, GetBlocksArgs, query_blocks, query_archived_blocks};

async fn query_one_block(ledger: Principal, block_index: BlockIndex) -> CallResult<Option<Block>> {
  let args = GetBlocksArgs { start: block_index, length: 1 };

  let blocks_result = query_blocks(ledger, args.clone()).await?;

  if blocks_result.blocks.len() >= 1 {
      debug_assert_eq!(blocks_result.first_block_index, block_index);
      return Ok(blocks_result.blocks.into_iter().next());
  }

  if let Some(func) = blocks_result
      .archived_blocks
      .into_iter()
      .find_map(|b| (b.start <= block_index && (block_index - b.start) < b.length).then(|| b.callback)) {
      match query_archived_blocks(&func, args).await? {
          Ok(range) => return Ok(range.blocks.into_iter().next()),
          _ => (),
      }
  }
  Ok(None)
}