fuel-core 0.18.3

Fuel client library is aggregation of all fuels service. It contains the all business logic of the fuel protocol.
Documentation 
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use fuel_core_types::{
    blockchain::primitives::DaBlockHeight,
    entities::message::Message,
    fuel_types::Nonce,
};

pub trait RelayerPort {
    /// Get a message from the relayer if it has been
    /// synced and is <= the given da height.
    fn get_message(
        &self,
        id: &Nonce,
        da_height: &DaBlockHeight,
    ) -> anyhow::Result<Option<Message>>;
}

#[cfg(test)]
/// For some tests we don't care about the actual
/// implementation of the RelayerPort
/// and using a passthrough is fine.
impl RelayerPort for crate::database::Database {
    fn get_message(
        &self,
        id: &Nonce,
        _da_height: &DaBlockHeight,
    ) -> anyhow::Result<Option<Message>> {
        use fuel_core_storage::{
            tables::Messages,
            StorageAsRef,
        };
        use std::borrow::Cow;
        Ok(self.storage::<Messages>().get(id)?.map(Cow::into_owned))
    }
}