blockfrost-api

Core types and Servant API definitions.

Exploring data types

All data types have a ToSample instance for servant-docs which can be used to get a sample response in cabal repl:

λ: import Data.Proxy
λ: import Servant.Docs
λ: Just block = toSample (Proxy :: Proxy Block)
λ: _blockHash block
BlockHash "4ea1ba291e8eef538635a53e59fddba7810d1679631cc3aed7c8e6c4091a516a"

Lenses

Instead of using long record names, it is recommended to use provided lenses and a lens or similar package.

λ: import Control.Lens (^.)
λ: import Blockfrost.Lens
λ: block ^. epoch
Just (Epoch 425)

Monetary values

Ada values and values of assets are represented using Discrete type from safe-money library.

We use a type alias type Lovelaces = Money.Discrete "ADA" "lovelace" for Ada values and SomeDiscrete for asset values. This should allow working with monetary values safely, preventing summing different currencies. See the blog post by the library author.

λ: block ^. fees
Just (Discrete "ADA" 1000000%1 592661)