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//! Deduplication Service
//!
//! Hand-written — NOT generated. This file is safe from regeneration.
//!
//! Content-based deduplication using SHA-256 hashing.
//! When a file is uploaded, its hash is computed and checked against existing content.
//! If a match is found, the new file points to the same content (reference counting).
use std::sync::Arc;
use uuid::Uuid;
use super::error::{ServiceError, ServiceResult};
use crate::domain::entity::{ContentHash, StorageBackend};
use crate::infrastructure::persistence::ContentHashRepository;
use crate::infrastructure::persistence::StoredFileRepository;
/// Service for content-based file deduplication.
pub struct DeduplicationService {
hash_repo: Arc<ContentHashRepository>,
file_repo: Arc<StoredFileRepository>,
}
impl DeduplicationService {
pub fn new(
hash_repo: Arc<ContentHashRepository>,
file_repo: Arc<StoredFileRepository>,
) -> Self {
Self { hash_repo, file_repo }
}
/// Look up content by hash. If it exists, increment reference count and return it.
/// If not, create a new ContentHash record.
///
/// Returns `(content_hash, is_duplicate)`.
pub async fn find_or_create(
&self,
hash: &str,
_size_bytes: i64,
_storage_key: &str,
_storage_backend: StorageBackend,
) -> ServiceResult<(ContentHash, bool)> {
if let Some(existing) = self.hash_repo.find_by_hash(hash).await.map_err(|e| ServiceError::Repository(backbone_core::RepositoryError::DatabaseError(e.to_string())))? {
// TODO: increment reference count via custom repository method
return Ok((existing, true));
}
// TODO: ContentHash::builder() — implement when builder pattern is available
Err(ServiceError::Internal("ContentHash creation not yet implemented".to_string()))
}
/// Link a stored file to a content hash (after deduplication).
pub async fn link_file_to_hash(
&self,
_file_id: Uuid,
_content_hash_id: Uuid,
) -> ServiceResult<()> {
// TODO: file_repo.set_content_hash — implement custom repository method
Err(ServiceError::Internal("link_file_to_hash not yet implemented".to_string()))
}
/// Decrement reference when a file is deleted.
/// Returns true if the content can now be physically deleted.
pub async fn release_reference(&self, _content_hash_id: Uuid) -> ServiceResult<bool> {
// TODO: hash_repo.decrement_reference — implement custom repository method
Err(ServiceError::Internal("release_reference not yet implemented".to_string()))
}
/// Cleanup orphaned content hashes that have zero references.
pub async fn cleanup_orphaned(&self, _older_than_days: i64) -> ServiceResult<Vec<Uuid>> {
// TODO: hash_repo.find_orphaned — implement custom repository method
Err(ServiceError::Internal("cleanup_orphaned not yet implemented".to_string()))
}
/// Calculate total storage saved by deduplication.
pub async fn storage_saved_bytes(&self) -> ServiceResult<i64> {
// TODO: hash_repo.total_storage_saved — implement custom repository method
Err(ServiceError::Internal("storage_saved_bytes not yet implemented".to_string()))
}
}