soph_core/support/
container.rs

use crate::{error::ContainerError, traits::InstanceTrait, BoxFuture, Closure, Instance, Result};
use std::{
    any::TypeId,
    collections::HashMap,
    sync::{Arc, OnceLock},
};

static CONTAINER: OnceLock<Container> = OnceLock::new();

type InstanceClosures = Vec<(
    String,
    Closure<BoxFuture<'static, Result<(), ContainerError>>>,
    Closure<Result<(), ContainerError>>,
)>;

#[derive(Default)]
pub struct Container {
    facades: HashMap<TypeId, Instance>,
    closures: InstanceClosures,
}

impl Container {
    pub async fn register<T: InstanceTrait>(&mut self) -> Result<(), ContainerError> {
        let instance =
            Arc::new(
                T::register(self)
                    .await
                    .map_err(|err| ContainerError::Register {
                        instance: T::name(),
                        source: Box::new(err),
                    })?,
            );

        self.facades.insert(TypeId::of::<T>(), instance);

        self.closures
            .push((T::name(), Arc::new(T::boot), Arc::new(T::cleanup)));

        Ok(())
    }

    pub async fn boot(self) -> Result<(), ContainerError> {
        let container = CONTAINER.get_or_init(|| self);

        for (name, boot, _) in &container.closures {
            boot().await.map_err(|err| ContainerError::Boot {
                instance: name.to_owned(),
                source: Box::new(err),
            })?
        }

        Ok(())
    }

    pub fn cleanup(&self) -> Result<(), ContainerError> {
        for (name, _, cleaner) in &self.closures {
            cleaner().map_err(|err| ContainerError::Clean {
                instance: name.to_owned(),
                source: Box::new(err),
            })?
        }

        Ok(())
    }

    pub fn instances(&self) -> Vec<&String> {
        self.closures.iter().map(|(name, _, _)| name).collect()
    }

    pub fn resolve<T: InstanceTrait>(&self) -> Result<&T, ContainerError> {
        let instance = self
            .facades
            .get(&TypeId::of::<T>())
            .and_then(|boxed| boxed.downcast_ref::<T>())
            .ok_or(ContainerError::Resolve {
                instance: T::name(),
            })?;

        Ok(instance)
    }
}

pub fn app() -> &'static Container {
    CONTAINER.get().expect("`Container` not initialized")
}
soph_core/support/container.rs

soph_core/support/
container.rs
