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use std::net::SocketAddr;

use crate::jsonrpc::futures::sync::mpsc;
use crate::jsonrpc::Metadata;

/// Request context
pub struct RequestContext {
	/// Peer Address
	pub peer_addr: SocketAddr,
	/// Peer Sender channel
	pub sender: mpsc::Sender<String>,
}

/// Metadata extractor (per session)
pub trait MetaExtractor<M: Metadata>: Send + Sync {
	/// Extracts metadata from request context
	fn extract(&self, context: &RequestContext) -> M;
}

impl<M, F> MetaExtractor<M> for F
where
	M: Metadata,
	F: Fn(&RequestContext) -> M + Send + Sync,
{
	fn extract(&self, context: &RequestContext) -> M {
		(*self)(context)
	}
}

/// Noop-extractor
pub struct NoopExtractor;
impl<M: Metadata + Default> MetaExtractor<M> for NoopExtractor {
	fn extract(&self, _context: &RequestContext) -> M {
		M::default()
	}
}