Module zebra_state::service::read::find

Finding and reading block hashes and headers, in response to peer requests.

In the functions in this module:

The block write task commits blocks to the finalized state before updating chain with a cached copy of the best non-finalized chain from NonFinalizedState.chain_set. Then the block commit task can commit additional blocks to the finalized state after we’ve cloned the chain.

This means that some blocks can be in both:

• the cached Chain, and
• the shared finalized ZebraDb reference.

Functions

• best_relevant_chain 🔒
  Do a consistency check by checking the finalized tip before and after all other database queries.
• best_tip
  Returns the tip of the best chain in the non-finalized or finalized state.
• block_locator
  Create a block locator from chain and db.
• block_locator_heights
  Get the heights of the blocks for constructing a block_locator list.
• calculate_median_time_past 🔒
  Returns the median-time-past for the provided relevant_chain.
• chain_contains_hash
  Return true if hash is in chain or db.
• collect_chain_hashes 🔒
  Returns a list of block::Hashes in the chain, following the intersection with the chain.
• collect_chain_headers 🔒
  Returns a list of block::Headers in the chain, following the intersection with the chain.
• depth
  Return the depth of block hash from the chain tip. Searches chain for hash, then searches db.
• finalized_state_contains_block_hash
  Returns the location of the block if present in the finalized state. Returns None if the block hash is not found in the finalized state.
• find_chain_hashes
  Finds the first hash that’s in the peer’s known_blocks and the chain. Returns a list of hashes that follow that intersection, from the chain.
• find_chain_headers
  Finds the first hash that’s in the peer’s known_blocks and the chain. Returns a list of headers that follow that intersection, from the chain.
• find_chain_height_range 🔒
  Returns a range of Heights in the chain, starting after the intersection hash on the chain.
• find_chain_intersection 🔒
  Find the first hash that’s in the peer’s known_blocks, and in chain or db.
• hash_by_height
  Return the hash for the block at height, if height is in chain or db.
• height_by_hash
  Return the height for the block at hash, if hash is in chain or db.
• next_median_time_past
  Returns the median-time-past of the next block to be added to the best chain in non_finalized_state or db.
• non_finalized_state_contains_block_hash
  Returns the location of the block if present in the non-finalized state. Returns None if the block hash is not found in the non-finalized state.
• tip
  Returns the tip of chain. If there is no chain, returns the tip of db.
• tip_hash
  Returns the tip block::Hash of chain. If there is no chain, returns the tip of db.
• tip_height
  Returns the tip Height of chain. If there is no chain, returns the tip of db.