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use crate::{proto, B3Digest};
use data_encoding::BASE64;
use thiserror::Error;
mod grpc_nar_calculation_service;
mod non_caching_calculation_service;
mod renderer;
pub use grpc_nar_calculation_service::GRPCNARCalculationService;
pub use non_caching_calculation_service::NonCachingNARCalculationService;
pub use renderer::NARRenderer;
/// Errors that can encounter while rendering NARs.
#[derive(Debug, Error)]
pub enum RenderError {
#[error("failure talking to a backing store client: {0}")]
StoreError(crate::Error),
#[error("unable to find directory {}, referred from {}", .0, .1)]
DirectoryNotFound(B3Digest, String),
#[error("unable to find blob {}, referred from {}", BASE64.encode(.0), .1)]
BlobNotFound([u8; 32], String),
#[error("unexpected size in metadata for blob {}, referred from {} returned, expected {}, got {}", BASE64.encode(.0), .1, .2, .3)]
UnexpectedBlobMeta([u8; 32], String, u32, u32),
#[error("failure using the NAR writer: {0}")]
NARWriterError(std::io::Error),
}
/// The base trait for something calculating NARs, and returning their size and sha256.
pub trait NARCalculationService {
fn calculate_nar(&self, root_node: &proto::node::Node) -> Result<(u64, [u8; 32]), RenderError>;
}
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