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//! Python layer bindings.
//!
//! Each layer lives in its own module so new layers can be added without growing
//! a single file. The concrete types are re-exported here (so paths such as
//! `crate::RetryLayer` keep working) and registered on the flat `opendal.layers`
//! Python module.

mod capability_override;
mod concurrent_limit;
mod mime_guess;
mod retry;
mod timeout;

pub use capability_override::CapabilityOverrideLayer;
pub use concurrent_limit::ConcurrentLimitLayer;
pub use mime_guess::MimeGuessLayer;
pub use retry::RetryLayer;
pub use timeout::TimeoutLayer;

use opendal::Operator;
use pyo3::prelude::*;

/// Shared behavior for every Python layer: wrap an [`Operator`] with the
/// underlying core layer.
pub trait PythonLayer: Send + Sync {
    fn layer(&self, op: Operator) -> Operator;
}

/// Base class for all layers.
///
/// A layer wraps an operator to intercept operations on the underlying
/// storage, adding behavior such as retries, timeouts, concurrency limits,
/// or content-type detection.
///
/// This class is not meant to be instantiated directly. Use a concrete
/// subclass such as `RetryLayer` or `TimeoutLayer` and apply it with
/// `Operator.layer` or `AsyncOperator.layer`.
#[pyclass(module = "opendal.layers", subclass)]
pub struct Layer(pub Box<dyn PythonLayer>);