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use crate::{
    account::AccountHash,
    system::{mint::Error, CallStackElement},
    Key, Phase,
};

/// Provider of runtime host functionality.
pub trait RuntimeProvider {
    /// This method should return the caller of the current context.
    fn get_caller(&self) -> AccountHash;

    /// This method should return the immediate caller of the current context.
    fn get_immediate_caller(&self) -> Option<&CallStackElement>;

    /// Gets execution phase
    fn get_phase(&self) -> Phase;

    /// This method should handle storing given [`Key`] under `name`.
    fn put_key(&mut self, name: &str, key: Key) -> Result<(), Error>;

    /// This method should handle obtaining a given named [`Key`] under a `name`.
    fn get_key(&self, name: &str) -> Option<Key>;
}