haematite 0.7.0

//! The on-disk node store's error type.

use std::fmt;
use std::path::PathBuf;

use crate::store::cache::CacheError;

#[derive(Debug)]
pub enum StoreError {
    DirectoryNotFound,
    NotADirectory { path: PathBuf },
    MissingParentDirectory { path: PathBuf },
    InvalidCapacity,
    Io(std::io::Error),
    Compression(String),
    Deserialise(String),
}

impl fmt::Display for StoreError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::DirectoryNotFound => write!(f, "storage directory was not found"),
            Self::NotADirectory { path } => {
                write!(f, "storage path is not a directory: {}", path.display())
            }
            Self::MissingParentDirectory { path } => {
                write!(f, "node path has no parent directory: {}", path.display())
            }
            Self::InvalidCapacity => write!(f, "cache capacity must be greater than zero"),
            Self::Io(error) => write!(f, "disk store I/O error: {error}"),
            Self::Compression(error) => write!(f, "zstd compression error: {error}"),
            Self::Deserialise(error) => write!(f, "node deserialisation error: {error}"),
        }
    }
}

impl std::error::Error for StoreError {
    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
        match self {
            Self::Io(error) => Some(error),
            Self::DirectoryNotFound
            | Self::NotADirectory { .. }
            | Self::MissingParentDirectory { .. }
            | Self::InvalidCapacity
            | Self::Compression(_)
            | Self::Deserialise(_) => None,
        }
    }
}

impl From<std::io::Error> for StoreError {
    fn from(error: std::io::Error) -> Self {
        Self::Io(error)
    }
}

impl From<CacheError> for StoreError {
    fn from(error: CacheError) -> Self {
        match error {
            CacheError::InvalidCapacity => Self::InvalidCapacity,
        }
    }
}