Environment Information
Transaction Information
To get the addresses of the signers of a transaction,
use the address field of each signing AuthAccount
that is passed to the transaction's prepare phase.
There is currently no API that allows getting other transaction information. Please let us know if your use-case demands it by request this feature in an issue.
Block Information
To get information about a block, the functions getCurrentBlock and getBlock can be used:
-
fun getCurrentBlock(): BlockReturns the current block, i.e. the block which contains the currently executed transaction.
-
fun getBlock(at height: UInt64): Block?Returns the block at the given height. If the given block does not exist the function returns
nil.
The Block type contains the identifier, height, and timestamp:
pub struct Block {
/// The ID of the block.
///
/// It is essentially the hash of the block.
///
pub let id: [UInt8; 32]
/// The height of the block.
///
/// If the blockchain is viewed as a tree with the genesis block at the root,
// the height of a node is the number of edges between the node and the genesis block
///
pub let height: UInt64
/// The view of the block.
///
/// It is a detail of the consensus algorithm. It is a monotonically increasing integer
/// and counts rounds in the consensus algorithm. Since not all rounds result in a finalized block,
/// the view number is strictly greater than or equal to the block height
///
pub let view: UInt64
/// The timestamp of the block.
///
/// It is the local clock time of the block proposer when it generates the block
///
pub let timestamp: UFix64
}