ledb-actix 0.4.0

LEDB Actor for Actix actor framework and storage REST-interface
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use std::pin::Pin;

use super::Storage;
use actix::{dev::ToEnvelope, Addr, Handler, MailboxError, Message};
use futures::{future::Either, Future};

/// Helper for sending queries
///
/// This is alternative to `Addr<Storage>::send` which unwraps results of type `Result` using `Either` type for wrapping errors.
pub trait StorageAddrExt<A> {
    fn get_storage_addr<M, T, E>(&self) -> &Addr<A>
    where
        A: Handler<M> + Send,
        A::Context: ToEnvelope<A, M>,
        M: Message<Result = Result<T, E>> + Send + 'static,
        T: Send + 'static,
        E: Send + 'static;

    /// Send query and get unwrapped result
    fn send_query<M, T, E>(
        &self,
        msg: M,
    ) -> Pin<Box<dyn Future<Output = Result<T, Either<MailboxError, E>>> + Send>>
    where
        A: Handler<M> + Send,
        A::Context: ToEnvelope<A, M>,
        M: Message<Result = Result<T, E>> + Send + 'static,
        T: Send + 'static,
        E: Send + 'static,
    {
        let request = self.get_storage_addr().send(msg);
        Box::pin(async { request.await.map_err(Either::Left)?.map_err(Either::Right) })
    }
}

impl StorageAddrExt<Storage> for Addr<Storage> {
    fn get_storage_addr<M, T, E>(&self) -> &Addr<Storage>
    where
        Storage: Handler<M>,
        M: Message<Result = Result<T, E>> + Send,
        T: Send + 'static,
        E: Send + 'static,
    {
        self
    }
}