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//! Methods for retrieving swagger-related information from an HTTP request.
use hyper::Request;

/// A trait for retrieving swagger-related information from a request.
///
/// This allows other middlewares to retrieve API-related information from a request that
/// may not have been handled by the autogenerated API code yet.   For example, a statistics
/// tracking service may wish to use this to count requests per-operation.
///
/// The trait is automatically implemented by swagger-codegen.
pub trait RequestParser {
    /// Retrieve the Swagger operation identifier that matches this request.
    ///
    /// Returns `Err(())` if this request does not match any known operation on this API.
    fn parse_operation_id(req: &Request) -> Result<&'static str, ()>;
}