DioCrafts
1073 lines
40 KiB
Rust
1073 lines
40 KiB
Rust
use bytes::Bytes;
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use image::codecs::jpeg::JpegEncoder;
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use image::imageops::FilterType;
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use rayon::prelude::*;
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/**
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* Thumbnail Generation Service
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*
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* Generates and manages image thumbnails for fast gallery previews.
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*
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* Features:
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* - Background thumbnail generation after upload
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* - Multiple sizes (icon 150x150, preview 800x600)
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* - JPEG output (lossy q=80) for compact thumbnails
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* - Lock-free moka cache with weight-based eviction
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* - Lazy generation on first request if not pre-generated
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* - Timeout protection for large image processing
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*/
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use std::path::{Path, PathBuf};
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use std::sync::Arc;
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use std::time::Duration;
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use tokio::fs;
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use tokio::sync::Semaphore;
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use tokio::time::timeout;
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use crate::application::ports::thumbnail_ports::{
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ThumbnailPort, ThumbnailSize as PortThumbnailSize, ThumbnailStatsDto,
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};
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use crate::domain::errors::{DomainError, ErrorKind};
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/// Thumbnail sizes supported by the system
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#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
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pub enum ThumbnailSize {
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/// Small icon for file listings (150x150)
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Icon,
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/// Medium preview for gallery view (400x400)
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Preview,
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/// Large preview for detail view (800x800)
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Large,
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}
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impl ThumbnailSize {
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/// Get the maximum dimension for this size
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pub fn max_dimension(&self) -> u32 {
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match self {
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ThumbnailSize::Icon => 150,
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ThumbnailSize::Preview => 400,
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ThumbnailSize::Large => 800,
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}
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}
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/// Get the directory name for this size
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pub fn dir_name(&self) -> &'static str {
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match self {
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ThumbnailSize::Icon => "icon",
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ThumbnailSize::Preview => "preview",
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ThumbnailSize::Large => "large",
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}
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}
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/// Get all thumbnail sizes
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pub fn all() -> &'static [ThumbnailSize] {
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&[
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ThumbnailSize::Icon,
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ThumbnailSize::Preview,
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ThumbnailSize::Large,
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]
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}
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}
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/// Cache key for thumbnails
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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struct ThumbnailCacheKey {
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file_id: String,
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size: ThumbnailSize,
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}
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/// Maximum pixel count before rejecting decode (50 megapixels → ~200 MB RGBA).
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/// Images above this are silently skipped — protects against single-image OOM.
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const MAX_DECODE_PIXELS: u64 = 50_000_000;
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/// Compute max concurrent thumbnail decode operations at runtime.
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/// Uses half the available CPUs (min 2) to scale with hardware while
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/// bounding peak RAM. `available_parallelism()` respects cgroup limits
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/// (Docker/K8s) and CPU affinity masks.
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fn max_concurrent_decodes() -> usize {
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let cpus = std::thread::available_parallelism()
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.map(|n| n.get())
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.unwrap_or(4);
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(cpus / 2).max(2)
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}
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/// Thumbnail service for generating and caching image thumbnails
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pub struct ThumbnailService {
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/// Root path for thumbnail storage
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thumbnails_root: PathBuf,
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/// Lock-free concurrent cache (moka) with weight-based eviction
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cache: moka::future::Cache<ThumbnailCacheKey, Bytes>,
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/// Configured maximum cache weight (for stats reporting)
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max_cache_bytes: u64,
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/// Limits how many images are decoded in parallel to bound RAM usage.
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/// Without this, 50 simultaneous uploads would decode 50 bitmaps
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/// (~96 MB each for 6000×4000) = 4.8 GB peak.
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decode_semaphore: Arc<Semaphore>,
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/// Timeout for thumbnail generation operations to prevent hanging on large images.
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/// Defaults to 30 seconds.
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generation_timeout: Duration,
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}
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impl ThumbnailService {
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/// Create a new thumbnail service
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///
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/// # Arguments
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/// * `storage_root` - Root path of file storage
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/// * `max_cache_entries` - (ignored — moka uses weight-based eviction)
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/// * `max_cache_bytes` - Maximum total bytes to cache
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/// * `generation_timeout` - Timeout for thumbnail generation operations
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pub fn new(
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storage_root: &Path,
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max_cache_entries: usize,
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max_cache_bytes: usize,
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generation_timeout: Option<Duration>,
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) -> Self {
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let thumbnails_root = storage_root.join(".thumbnails");
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// Ignore max_cache_entries — weight-based eviction is more accurate
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// for variable-size thumbnails than entry-count limits.
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let _ = max_cache_entries;
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// No time_to_live — thumbnails are immutable (content never changes
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// for a given file_id). Eviction is purely weight-based: when the
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// cache exceeds max_cache_bytes the lightest entries are dropped.
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// On eviction the thumbnail is still on disk; the next request
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// promotes it back with a single async read (~0.1 ms).
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let cache = moka::future::Cache::builder()
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.max_capacity(max_cache_bytes as u64)
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.weigher(|_key: &ThumbnailCacheKey, value: &Bytes| -> u32 {
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value.len().min(u32::MAX as usize) as u32
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})
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.build();
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Self {
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thumbnails_root,
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cache,
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max_cache_bytes: max_cache_bytes as u64,
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decode_semaphore: Arc::new(Semaphore::new(max_concurrent_decodes())),
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generation_timeout: generation_timeout.unwrap_or(Duration::from_secs(30)),
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}
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}
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/// Initialize the thumbnail directories
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pub async fn initialize(&self) -> std::io::Result<()> {
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for size in ThumbnailSize::all() {
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let dir = self.thumbnails_root.join(size.dir_name());
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fs::create_dir_all(&dir).await?;
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}
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tracing::info!(
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"🖼️ Thumbnail service initialized at {:?}",
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self.thumbnails_root
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);
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Ok(())
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}
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/// Check if a file is an image that can have thumbnails
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pub fn is_supported_image(mime_type: &str) -> bool {
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matches!(
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mime_type,
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"image/jpeg" | "image/jpg" | "image/png" | "image/gif" | "image/webp"
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)
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}
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/// Get the path where a thumbnail would be stored (keyed by blob hash for dedup).
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fn get_thumbnail_path(&self, blob_hash: &str, size: ThumbnailSize) -> PathBuf {
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self.thumbnails_root
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.join(size.dir_name())
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.join(format!("{}.jpg", blob_hash))
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}
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/// Get a thumbnail, generating it if needed.
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///
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/// # Arguments
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/// * `file_id` - ID of the original file (used as moka cache key)
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/// * `blob_hash` - Content hash of the file (used as disk key for dedup)
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/// * `size` - Desired thumbnail size
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/// * `original_path` - Path to the original image file
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///
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/// # Returns
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/// Bytes of the thumbnail image (JPEG format)
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pub async fn get_thumbnail(
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&self,
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file_id: &str,
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blob_hash: &str,
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size: ThumbnailSize,
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original_path: &Path,
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) -> Result<Bytes, ThumbnailError> {
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let cache_key = ThumbnailCacheKey {
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file_id: file_id.to_string(),
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size,
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};
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let thumb_path = self.get_thumbnail_path(blob_hash, size);
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let original_owned = original_path.to_path_buf();
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let file_id_owned = file_id.to_string();
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// Moka's entry().or_insert_with() guarantees that for the same key
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// only ONE init closure runs; concurrent callers await the same
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// computation instead of stampeding (thundering-herd protection).
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let entry = self
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.cache
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.entry(cache_key)
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.or_insert_with(async {
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// 1. Try loading from disk
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if let Ok(data) = fs::read(&thumb_path).await {
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tracing::debug!(
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"💾 Thumbnail loaded from disk: {} {:?}",
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file_id_owned,
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size
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);
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return Bytes::from(data);
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}
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// 2. Generate thumbnail (CPU-bound, runs in spawn_blocking)
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tracing::info!("🎨 Generating thumbnail: {} {:?}", file_id_owned, size);
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match self.generate_thumbnail(&original_owned, size).await {
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Ok(bytes) => {
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// Save to disk (best-effort — don't fail the request)
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if let Some(parent) = thumb_path.parent() {
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let _ = fs::create_dir_all(parent).await;
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}
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let _ = fs::write(&thumb_path, &bytes).await;
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bytes
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}
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Err(e) => {
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tracing::warn!(
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"Thumbnail generation failed for {} {:?}: {e}",
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file_id_owned,
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size
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);
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// Return empty sentinel — will be evicted quickly by
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// the weigher (weight 0) and retried on next request.
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Bytes::new()
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}
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}
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})
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.await;
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let bytes = entry.into_value();
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if bytes.is_empty() {
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return Err(ThumbnailError::ImageError(
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"Thumbnail generation failed".to_string(),
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));
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}
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tracing::debug!("🔥 Thumbnail served: {} {:?}", file_id, size);
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Ok(bytes)
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}
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/// Get a thumbnail from raw image bytes, generating it if needed.
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///
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/// This is the storage-model-safe entrypoint for CDC/manifest-backed
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/// blobs where no single local source file exists on disk.
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pub async fn get_thumbnail_from_bytes(
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&self,
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file_id: &str,
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blob_hash: &str,
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size: ThumbnailSize,
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original_data: Bytes,
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) -> Result<Bytes, ThumbnailError> {
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let cache_key = ThumbnailCacheKey {
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file_id: file_id.to_string(),
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size,
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};
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let thumb_path = self.get_thumbnail_path(blob_hash, size);
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let file_id_owned = file_id.to_string();
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let entry = self
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.cache
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.entry(cache_key)
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.or_insert_with(async move {
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if let Ok(data) = fs::read(&thumb_path).await {
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tracing::debug!(
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"💾 Thumbnail loaded from disk: {} {:?}",
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file_id_owned,
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size
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);
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return Bytes::from(data);
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}
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tracing::info!("🎨 Generating thumbnail: {} {:?}", file_id_owned, size);
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match Self::generate_thumbnail_from_data(
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original_data,
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size,
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self.generation_timeout,
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)
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.await
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{
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Ok(bytes) => {
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if let Some(parent) = thumb_path.parent() {
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let _ = fs::create_dir_all(parent).await;
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}
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let _ = fs::write(&thumb_path, &bytes).await;
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bytes
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}
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Err(e) => {
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tracing::warn!(
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"Thumbnail generation failed for {} {:?}: {e}",
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file_id_owned,
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size
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);
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Bytes::new()
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}
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}
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})
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.await;
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let bytes = entry.into_value();
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if bytes.is_empty() {
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return Err(ThumbnailError::ImageError(
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"Thumbnail generation failed".to_string(),
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));
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}
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tracing::debug!("🔥 Thumbnail served: {} {:?}", file_id, size);
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Ok(bytes)
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}
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/// Try to serve a thumbnail from cache only (memory → disk).
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///
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/// Unlike `get_thumbnail`, this does **not** generate a new thumbnail.
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/// Useful for non-image file types (videos) where a client-generated
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/// thumbnail may have been uploaded previously.
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///
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/// `blob_hash` is used to locate the file on disk (dedup-aware).
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/// If `None`, only the in-memory cache is checked (used for video
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/// thumbnails where blob_hash is not yet resolved).
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pub async fn get_cached_thumbnail(
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&self,
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file_id: &str,
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blob_hash: Option<&str>,
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size: ThumbnailSize,
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) -> Option<Bytes> {
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// 1. Check in-memory cache
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let cache_key = ThumbnailCacheKey {
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file_id: file_id.to_string(),
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size,
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};
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if let Some(bytes) = self.cache.get(&cache_key).await
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&& !bytes.is_empty()
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{
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return Some(bytes);
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}
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// 2. Check disk for external (video-frame) thumbnails stored by file_id.
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// These don't require blob_hash since they use ext-{file_id}.jpg paths.
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let ext_path = self
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.thumbnails_root
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.join(size.dir_name())
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.join(format!("ext-{}.jpg", file_id));
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if let Ok(data) = fs::read(&ext_path).await {
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let bytes = Bytes::from(data);
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self.cache.insert(cache_key.clone(), bytes.clone()).await;
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return Some(bytes);
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}
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// 3. Check disk for blob-hash thumbnails (needs blob_hash to locate)
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let hash = blob_hash?;
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let thumb_path = self.get_thumbnail_path(hash, size);
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if let Ok(data) = fs::read(&thumb_path).await {
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let bytes = Bytes::from(data);
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// Populate in-memory cache for next hit
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self.cache.insert(cache_key, bytes.clone()).await;
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Some(bytes)
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} else {
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None
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}
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}
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/// Store an externally-generated thumbnail (e.g. client-side video frame).
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///
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/// **Fast path**: if the payload is already a correctly-sized JPEG, it is
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/// stored as-is — zero decode, zero encode. The browser pre-scales the
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/// canvas to 400 px and sends JPEG, so this fast path is hit on every
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/// normal video-thumbnail upload.
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///
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/// **Slow path**: decode → optional resize → re-encode to JPEG q=80.
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/// Only triggered when a client sends an oversized or non-JPEG image.
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///
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/// External thumbnails (video frames) are stored by `file_id` since
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/// they are client-generated and not dedup-able.
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pub async fn store_external_thumbnail(
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&self,
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file_id: &str,
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size: ThumbnailSize,
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data: Bytes,
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) -> Result<Bytes, ThumbnailError> {
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let max_dim = size.max_dimension();
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// Validate + optionally re-encode in blocking thread
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let jpeg_bytes = tokio::task::spawn_blocking(move || -> Result<Vec<u8>, ThumbnailError> {
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// ── Fast path: already a correctly-sized JPEG ─────────────
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// JPEG files start with SOI marker 0xFF 0xD8.
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if data.len() >= 2
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&& data[0] == 0xFF
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&& data[1] == 0xD8
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&& let Ok(reader) =
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image::ImageReader::new(std::io::Cursor::new(&data)).with_guessed_format()
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&& let Ok((w, h)) = reader.into_dimensions()
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&& w <= max_dim
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&& h <= max_dim
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{
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// Already JPEG at correct size — zero-copy store
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return Ok(data.to_vec());
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}
|
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|
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// ── Slow path: decode, resize, re-encode to JPEG ─────────
|
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let img = image::load_from_memory(&data)
|
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.map_err(|e| ThumbnailError::ImageError(format!("Invalid image data: {e}")))?;
|
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|
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let (w, h) = (img.width(), img.height());
|
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let img = if w > max_dim || h > max_dim {
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let filter = FilterType::CatmullRom;
|
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if w > h {
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let ratio = max_dim as f32 / w as f32;
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img.resize(max_dim, (h as f32 * ratio) as u32, filter)
|
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} else {
|
||
let ratio = max_dim as f32 / h as f32;
|
||
img.resize((w as f32 * ratio) as u32, max_dim, filter)
|
||
}
|
||
} else {
|
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img
|
||
};
|
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|
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let rgb = img.to_rgb8();
|
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let mut buffer = Vec::new();
|
||
let encoder = JpegEncoder::new_with_quality(&mut buffer, 80);
|
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rgb.write_with_encoder(encoder)
|
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.map_err(|e| ThumbnailError::ImageError(e.to_string()))?;
|
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Ok(buffer)
|
||
})
|
||
.await
|
||
.map_err(|e| ThumbnailError::TaskError(e.to_string()))??;
|
||
|
||
let bytes = Bytes::from(jpeg_bytes);
|
||
|
||
// External thumbnails are stored by file_id (not dedup-able)
|
||
let thumb_path = self
|
||
.thumbnails_root
|
||
.join(size.dir_name())
|
||
.join(format!("ext-{}.jpg", file_id));
|
||
if let Some(parent) = thumb_path.parent() {
|
||
let _ = fs::create_dir_all(parent).await;
|
||
}
|
||
fs::write(&thumb_path, &bytes)
|
||
.await
|
||
.map_err(|e| ThumbnailError::IoError(e.to_string()))?;
|
||
|
||
// Populate in-memory cache
|
||
let cache_key = ThumbnailCacheKey {
|
||
file_id: file_id.to_string(),
|
||
size,
|
||
};
|
||
self.cache.insert(cache_key, bytes.clone()).await;
|
||
|
||
tracing::info!("✅ Stored external thumbnail: {} {:?}", file_id, size);
|
||
Ok(bytes)
|
||
}
|
||
|
||
fn render_thumbnail_from_data(
|
||
data: &[u8],
|
||
size: ThumbnailSize,
|
||
) -> Result<Vec<u8>, ThumbnailError> {
|
||
let max_dim = size.max_dimension();
|
||
|
||
let (w, h) = image::ImageReader::new(std::io::Cursor::new(data))
|
||
.with_guessed_format()
|
||
.map_err(|e| ThumbnailError::ImageError(e.to_string()))?
|
||
.into_dimensions()
|
||
.map_err(|e| ThumbnailError::ImageError(e.to_string()))?;
|
||
if (w as u64) * (h as u64) > MAX_DECODE_PIXELS {
|
||
return Err(ThumbnailError::ImageError(format!(
|
||
"Image too large for thumbnail: {w}×{h} ({} MP, max {MAX_DECODE_PIXELS})",
|
||
w as u64 * h as u64 / 1_000_000
|
||
)));
|
||
}
|
||
|
||
let img =
|
||
image::load_from_memory(data).map_err(|e| ThumbnailError::ImageError(e.to_string()))?;
|
||
|
||
let img = {
|
||
use crate::infrastructure::services::exif_service::{ExifService, apply_orientation};
|
||
let orientation = ExifService::extract(data)
|
||
.and_then(|m| m.orientation)
|
||
.unwrap_or(1);
|
||
apply_orientation(img, orientation)
|
||
};
|
||
|
||
let (orig_width, orig_height) = (img.width(), img.height());
|
||
let (new_width, new_height) = if orig_width > orig_height {
|
||
let ratio = max_dim as f32 / orig_width as f32;
|
||
(max_dim, (orig_height as f32 * ratio) as u32)
|
||
} else {
|
||
let ratio = max_dim as f32 / orig_height as f32;
|
||
((orig_width as f32 * ratio) as u32, max_dim)
|
||
};
|
||
|
||
let filter = match size {
|
||
ThumbnailSize::Icon => FilterType::Triangle,
|
||
ThumbnailSize::Preview => FilterType::CatmullRom,
|
||
ThumbnailSize::Large => FilterType::CatmullRom,
|
||
};
|
||
let thumbnail = img.resize(new_width, new_height, filter);
|
||
|
||
let rgb = thumbnail.to_rgb8();
|
||
let mut buffer = Vec::new();
|
||
let encoder = JpegEncoder::new_with_quality(&mut buffer, 80);
|
||
rgb.write_with_encoder(encoder)
|
||
.map_err(|e| ThumbnailError::ImageError(e.to_string()))?;
|
||
|
||
Ok(buffer)
|
||
}
|
||
|
||
fn render_all_thumbnails_from_data(
|
||
data: &[u8],
|
||
) -> Result<Vec<(ThumbnailSize, Bytes)>, ThumbnailError> {
|
||
let (w, h) = image::ImageReader::new(std::io::Cursor::new(data))
|
||
.with_guessed_format()
|
||
.map_err(|e| ThumbnailError::ImageError(e.to_string()))?
|
||
.into_dimensions()
|
||
.map_err(|e| ThumbnailError::ImageError(e.to_string()))?;
|
||
if (w as u64) * (h as u64) > MAX_DECODE_PIXELS {
|
||
return Err(ThumbnailError::ImageError(format!(
|
||
"Image too large for thumbnail: {w}×{h} ({} MP, max {MAX_DECODE_PIXELS})",
|
||
w as u64 * h as u64 / 1_000_000
|
||
)));
|
||
}
|
||
|
||
let img =
|
||
image::load_from_memory(data).map_err(|e| ThumbnailError::ImageError(e.to_string()))?;
|
||
|
||
let img = {
|
||
use crate::infrastructure::services::exif_service::{ExifService, apply_orientation};
|
||
let orientation = ExifService::extract(data)
|
||
.and_then(|m| m.orientation)
|
||
.unwrap_or(1);
|
||
apply_orientation(img, orientation)
|
||
};
|
||
|
||
let (orig_w, orig_h) = (img.width(), img.height());
|
||
|
||
ThumbnailSize::all()
|
||
.par_iter()
|
||
.map(|&size| {
|
||
let max_dim = size.max_dimension();
|
||
|
||
let (new_w, new_h) = if orig_w > orig_h {
|
||
let ratio = max_dim as f32 / orig_w as f32;
|
||
(max_dim, (orig_h as f32 * ratio) as u32)
|
||
} else {
|
||
let ratio = max_dim as f32 / orig_h as f32;
|
||
((orig_w as f32 * ratio) as u32, max_dim)
|
||
};
|
||
|
||
let filter = match size {
|
||
ThumbnailSize::Icon => FilterType::Triangle,
|
||
ThumbnailSize::Preview => FilterType::CatmullRom,
|
||
ThumbnailSize::Large => FilterType::CatmullRom,
|
||
};
|
||
let thumb = img.resize(new_w, new_h, filter);
|
||
|
||
let rgb = thumb.to_rgb8();
|
||
let mut buf = Vec::new();
|
||
let encoder = JpegEncoder::new_with_quality(&mut buf, 80);
|
||
rgb.write_with_encoder(encoder)
|
||
.map_err(|e| ThumbnailError::ImageError(e.to_string()))?;
|
||
|
||
Ok((size, Bytes::from(buf)))
|
||
})
|
||
.collect::<Result<Vec<_>, ThumbnailError>>()
|
||
}
|
||
|
||
async fn generate_thumbnail_from_data(
|
||
original_data: Bytes,
|
||
size: ThumbnailSize,
|
||
timeout_duration: Duration,
|
||
) -> Result<Bytes, ThumbnailError> {
|
||
let spawn_result = tokio::task::spawn_blocking(move || {
|
||
Self::render_thumbnail_from_data(original_data.as_ref(), size)
|
||
});
|
||
|
||
let result = timeout(timeout_duration, spawn_result)
|
||
.await
|
||
.map_err(|_| {
|
||
ThumbnailError::TaskError(format!(
|
||
"Thumbnail generation timed out after {:?}",
|
||
timeout_duration
|
||
))
|
||
})?
|
||
.map_err(|e| ThumbnailError::TaskError(e.to_string()))?;
|
||
|
||
result.map(Bytes::from)
|
||
}
|
||
|
||
/// Generate a thumbnail from an image file.
|
||
///
|
||
/// Concurrency is bounded by `decode_semaphore` to prevent OOM when
|
||
/// many images are uploaded simultaneously. Resolution is also
|
||
/// capped at `MAX_DECODE_PIXELS` to reject pathologically large images.
|
||
/// After decoding, the encoded image buffer is explicitly dropped before
|
||
/// processing to minimize peak memory usage.
|
||
/// A timeout prevents the operation from hanging indefinitely on large images.
|
||
async fn generate_thumbnail(
|
||
&self,
|
||
original_path: &Path,
|
||
size: ThumbnailSize,
|
||
) -> Result<Bytes, ThumbnailError> {
|
||
let path = original_path.to_path_buf();
|
||
let timeout_duration = self.generation_timeout;
|
||
|
||
// Acquire semaphore permit — bounds peak RAM from concurrent decodes
|
||
let _permit = self
|
||
.decode_semaphore
|
||
.acquire()
|
||
.await
|
||
.map_err(|_| ThumbnailError::TaskError("Decode semaphore closed".into()))?;
|
||
|
||
// Run image processing in blocking thread pool with timeout
|
||
let spawn_result =
|
||
tokio::task::spawn_blocking(move || -> Result<Vec<u8>, ThumbnailError> {
|
||
let data =
|
||
std::fs::read(&path).map_err(|e| ThumbnailError::ImageError(e.to_string()))?;
|
||
Self::render_thumbnail_from_data(&data, size)
|
||
});
|
||
|
||
// Apply timeout to prevent hanging on large images
|
||
let result = timeout(timeout_duration, spawn_result)
|
||
.await
|
||
.map_err(|_| {
|
||
ThumbnailError::TaskError(format!(
|
||
"Thumbnail generation timed out after {:?}",
|
||
timeout_duration
|
||
))
|
||
})?
|
||
.map_err(|e| ThumbnailError::TaskError(e.to_string()))?;
|
||
|
||
result.map(Bytes::from)
|
||
}
|
||
|
||
/// Generate all thumbnail sizes for a file in the background.
|
||
///
|
||
/// Thumbnails are stored on disk keyed by `blob_hash`, so duplicate
|
||
/// uploads with the same content share a single set of thumbnails.
|
||
/// If thumbnails already exist for this `blob_hash`, only the moka
|
||
/// cache is populated (zero CPU for image processing).
|
||
///
|
||
/// Loads the image **once** and produces all 3 sizes (Icon, Preview,
|
||
/// Large) inside a single `spawn_blocking` call. This avoids 3×
|
||
/// I/O reads and 3× JPEG/PNG decode — reducing CPU time by ~45%
|
||
/// and peak RAM from ~540 MB to ~180 MB for concurrent uploads.
|
||
/// The encoded image buffer is explicitly dropped after decoding
|
||
/// to further reduce peak memory by the size of the original file.
|
||
pub fn generate_all_sizes_background(
|
||
self: Arc<Self>,
|
||
file_id: String,
|
||
blob_hash: String,
|
||
original_path: PathBuf,
|
||
) {
|
||
tokio::spawn(async move {
|
||
tracing::info!("🖼️ Background thumbnail generation starting: {}", file_id);
|
||
|
||
// ── Fast path: blob-hash thumbnails already exist on disk ────
|
||
// If another file with the same content was already uploaded,
|
||
// the thumbnails exist. Just populate the moka cache for this
|
||
// file_id and skip image processing entirely.
|
||
let all_exist = {
|
||
let mut ok = true;
|
||
for size in ThumbnailSize::all() {
|
||
let thumb_path = self.get_thumbnail_path(&blob_hash, *size);
|
||
if fs::metadata(&thumb_path).await.is_err() {
|
||
ok = false;
|
||
break;
|
||
}
|
||
}
|
||
ok
|
||
};
|
||
if all_exist {
|
||
for size in ThumbnailSize::all() {
|
||
let thumb_path = self.get_thumbnail_path(&blob_hash, *size);
|
||
if let Ok(data) = fs::read(&thumb_path).await {
|
||
let cache_key = ThumbnailCacheKey {
|
||
file_id: file_id.clone(),
|
||
size: *size,
|
||
};
|
||
self.cache.insert(cache_key, Bytes::from(data)).await;
|
||
}
|
||
}
|
||
tracing::info!(
|
||
"🖼️ Thumbnail dedup hit for {} (blob {}): skipped generation",
|
||
file_id,
|
||
&blob_hash[..12]
|
||
);
|
||
return;
|
||
}
|
||
|
||
// Acquire semaphore permit — bounds peak RAM from concurrent decodes
|
||
let _permit = match self.decode_semaphore.acquire().await {
|
||
Ok(p) => p,
|
||
Err(_) => {
|
||
tracing::warn!(
|
||
"Decode semaphore closed, skipping thumbnails for {}",
|
||
file_id
|
||
);
|
||
return;
|
||
}
|
||
};
|
||
|
||
let path = original_path.clone();
|
||
|
||
// Single spawn_blocking: 1 read + 1 decode + 3 resize + 3 encode
|
||
let results = tokio::task::spawn_blocking(move || {
|
||
// Single read: load file once into memory
|
||
let data =
|
||
std::fs::read(&path).map_err(|e| ThumbnailError::ImageError(e.to_string()))?;
|
||
|
||
// Safety check: read dimensions from in-memory buffer (no 2nd I/O)
|
||
let (w, h) = image::ImageReader::new(std::io::Cursor::new(&data))
|
||
.with_guessed_format()
|
||
.map_err(|e| ThumbnailError::ImageError(e.to_string()))?
|
||
.into_dimensions()
|
||
.map_err(|e| ThumbnailError::ImageError(e.to_string()))?;
|
||
if (w as u64) * (h as u64) > MAX_DECODE_PIXELS {
|
||
return Err(ThumbnailError::ImageError(format!(
|
||
"Image too large for thumbnail: {w}×{h} ({} MP, max {MAX_DECODE_PIXELS})",
|
||
w as u64 * h as u64 / 1_000_000
|
||
)));
|
||
}
|
||
|
||
// Full decode from the same in-memory buffer (no 2nd disk read)
|
||
let img = image::load_from_memory(&data)
|
||
.map_err(|e| ThumbnailError::ImageError(e.to_string()))?;
|
||
|
||
// Apply EXIF orientation so thumbnails display correctly
|
||
let img = {
|
||
use crate::infrastructure::services::exif_service::{
|
||
ExifService, apply_orientation,
|
||
};
|
||
let orientation = ExifService::extract(&data)
|
||
.and_then(|m| m.orientation)
|
||
.unwrap_or(1);
|
||
// Free the encoded image data now that image is decoded and EXIF extracted
|
||
drop(data);
|
||
apply_orientation(img, orientation)
|
||
};
|
||
|
||
let (orig_w, orig_h) = (img.width(), img.height());
|
||
|
||
ThumbnailSize::all()
|
||
.par_iter()
|
||
.map(|&size| {
|
||
let max_dim = size.max_dimension();
|
||
|
||
let (new_w, new_h) = if orig_w > orig_h {
|
||
let ratio = max_dim as f32 / orig_w as f32;
|
||
(max_dim, (orig_h as f32 * ratio) as u32)
|
||
} else {
|
||
let ratio = max_dim as f32 / orig_h as f32;
|
||
((orig_w as f32 * ratio) as u32, max_dim)
|
||
};
|
||
|
||
let filter = match size {
|
||
ThumbnailSize::Icon => FilterType::Triangle,
|
||
ThumbnailSize::Preview => FilterType::CatmullRom,
|
||
ThumbnailSize::Large => FilterType::CatmullRom,
|
||
};
|
||
let thumb = img.resize(new_w, new_h, filter);
|
||
|
||
let rgb = thumb.to_rgb8();
|
||
let mut buf = Vec::new();
|
||
let encoder = JpegEncoder::new_with_quality(&mut buf, 80);
|
||
rgb.write_with_encoder(encoder)
|
||
.map_err(|e| ThumbnailError::ImageError(e.to_string()))?;
|
||
|
||
Ok((size, Bytes::from(buf)))
|
||
})
|
||
.collect::<Result<Vec<_>, ThumbnailError>>()
|
||
})
|
||
.await;
|
||
|
||
// Flatten JoinError + inner ThumbnailError
|
||
let thumbnails = match results {
|
||
Ok(Ok(t)) => t,
|
||
Ok(Err(e)) => {
|
||
tracing::warn!("Thumbnail generation failed for {}: {}", file_id, e);
|
||
return;
|
||
}
|
||
Err(e) => {
|
||
tracing::warn!("Thumbnail task panicked for {}: {}", file_id, e);
|
||
return;
|
||
}
|
||
};
|
||
|
||
// Save each size to disk (keyed by blob_hash for dedup)
|
||
// AND populate moka (keyed by file_id for fast serving).
|
||
for (size, bytes) in thumbnails {
|
||
let thumb_path = self.get_thumbnail_path(&blob_hash, size);
|
||
if let Some(parent) = thumb_path.parent() {
|
||
let _ = fs::create_dir_all(parent).await;
|
||
}
|
||
if let Err(e) = fs::write(&thumb_path, &bytes).await {
|
||
tracing::warn!("Failed to save thumbnail {} {:?}: {}", file_id, size, e);
|
||
} else {
|
||
// Populate in-memory cache for instant first-hit serving
|
||
let cache_key = ThumbnailCacheKey {
|
||
file_id: file_id.clone(),
|
||
size,
|
||
};
|
||
self.cache.insert(cache_key, bytes).await;
|
||
tracing::debug!("✅ Generated thumbnail: {} {:?}", file_id, size);
|
||
}
|
||
}
|
||
|
||
tracing::info!("✅ Background thumbnail generation complete: {}", file_id);
|
||
});
|
||
}
|
||
|
||
/// Generate all thumbnail sizes in the background from raw image bytes.
|
||
///
|
||
/// This is compatible with CDC/manifest-backed blobs because it does not
|
||
/// require a single physical source file on disk.
|
||
pub fn generate_all_sizes_background_from_bytes(
|
||
self: Arc<Self>,
|
||
file_id: String,
|
||
blob_hash: String,
|
||
original_data: Bytes,
|
||
) {
|
||
tokio::spawn(async move {
|
||
tracing::info!("🖼️ Background thumbnail generation starting: {}", file_id);
|
||
|
||
let all_exist = {
|
||
let mut ok = true;
|
||
for size in ThumbnailSize::all() {
|
||
let thumb_path = self.get_thumbnail_path(&blob_hash, *size);
|
||
if fs::metadata(&thumb_path).await.is_err() {
|
||
ok = false;
|
||
break;
|
||
}
|
||
}
|
||
ok
|
||
};
|
||
if all_exist {
|
||
for size in ThumbnailSize::all() {
|
||
let thumb_path = self.get_thumbnail_path(&blob_hash, *size);
|
||
if let Ok(data) = fs::read(&thumb_path).await {
|
||
let cache_key = ThumbnailCacheKey {
|
||
file_id: file_id.clone(),
|
||
size: *size,
|
||
};
|
||
self.cache.insert(cache_key, Bytes::from(data)).await;
|
||
}
|
||
}
|
||
tracing::info!(
|
||
"🖼️ Thumbnail dedup hit for {} (blob {}): skipped generation",
|
||
file_id,
|
||
&blob_hash[..12]
|
||
);
|
||
return;
|
||
}
|
||
|
||
let _permit = match self.decode_semaphore.acquire().await {
|
||
Ok(p) => p,
|
||
Err(_) => {
|
||
tracing::warn!(
|
||
"Decode semaphore closed, skipping thumbnails for {}",
|
||
file_id
|
||
);
|
||
return;
|
||
}
|
||
};
|
||
|
||
let results = tokio::task::spawn_blocking(move || {
|
||
Self::render_all_thumbnails_from_data(original_data.as_ref())
|
||
})
|
||
.await;
|
||
|
||
let thumbnails = match results {
|
||
Ok(Ok(t)) => t,
|
||
Ok(Err(e)) => {
|
||
tracing::warn!("Thumbnail generation failed for {}: {}", file_id, e);
|
||
return;
|
||
}
|
||
Err(e) => {
|
||
tracing::warn!("Thumbnail task panicked for {}: {}", file_id, e);
|
||
return;
|
||
}
|
||
};
|
||
|
||
for (size, bytes) in thumbnails {
|
||
let thumb_path = self.get_thumbnail_path(&blob_hash, size);
|
||
if let Some(parent) = thumb_path.parent() {
|
||
let _ = fs::create_dir_all(parent).await;
|
||
}
|
||
if let Err(e) = fs::write(&thumb_path, &bytes).await {
|
||
tracing::warn!("Failed to save thumbnail {} {:?}: {}", file_id, size, e);
|
||
} else {
|
||
let cache_key = ThumbnailCacheKey {
|
||
file_id: file_id.clone(),
|
||
size,
|
||
};
|
||
self.cache.insert(cache_key, bytes).await;
|
||
tracing::debug!("✅ Generated thumbnail: {} {:?}", file_id, size);
|
||
}
|
||
}
|
||
|
||
tracing::info!("✅ Background thumbnail generation complete: {}", file_id);
|
||
});
|
||
}
|
||
|
||
/// Delete thumbnails for a file.
|
||
///
|
||
/// Only invalidates the in-memory moka cache (keyed by file_id).
|
||
/// Disk thumbnails are keyed by blob_hash and may be shared by
|
||
/// other files with the same content — they are cleaned up via
|
||
/// `delete_blob_thumbnails` when the blob is garbage-collected.
|
||
/// Also removes any external (video-frame) thumbnails stored by file_id.
|
||
pub async fn delete_thumbnails(&self, file_id: &str) -> Result<(), ThumbnailError> {
|
||
for size in ThumbnailSize::all() {
|
||
// Remove from moka cache (lock-free invalidation)
|
||
let cache_key = ThumbnailCacheKey {
|
||
file_id: file_id.to_string(),
|
||
size: *size,
|
||
};
|
||
self.cache.invalidate(&cache_key).await;
|
||
|
||
// Remove external (video-frame) thumbnails stored by file_id
|
||
let ext_path = self
|
||
.thumbnails_root
|
||
.join(size.dir_name())
|
||
.join(format!("ext-{}.jpg", file_id));
|
||
if fs::metadata(&ext_path).await.is_ok() {
|
||
let _ = fs::remove_file(&ext_path).await;
|
||
}
|
||
}
|
||
|
||
tracing::debug!("🗑️ Invalidated thumbnail cache for: {}", file_id);
|
||
Ok(())
|
||
}
|
||
|
||
/// Remove orphaned blob-hash thumbnails whose blob no longer exists.
|
||
///
|
||
/// Call during blob garbage collection: pass the hash of the blob
|
||
/// being deleted and the corresponding thumbnails are removed from disk.
|
||
pub async fn delete_blob_thumbnails(&self, blob_hash: &str) {
|
||
for size in ThumbnailSize::all() {
|
||
let path = self.get_thumbnail_path(blob_hash, *size);
|
||
if fs::metadata(&path).await.is_ok() {
|
||
let _ = fs::remove_file(&path).await;
|
||
}
|
||
}
|
||
tracing::debug!(
|
||
"🗑️ Deleted blob thumbnails for hash: {}…",
|
||
&blob_hash[..blob_hash.len().min(12)]
|
||
);
|
||
}
|
||
|
||
/// Get cache statistics
|
||
pub async fn get_stats(&self) -> ThumbnailStats {
|
||
ThumbnailStats {
|
||
cached_thumbnails: self.cache.entry_count() as usize,
|
||
cache_size_bytes: self.cache.weighted_size() as usize,
|
||
max_cache_bytes: self.max_cache_bytes as usize,
|
||
}
|
||
}
|
||
}
|
||
|
||
// ─── Port implementation ─────────────────────────────────────────────────────
|
||
|
||
/// Convert port ThumbnailSize to infra ThumbnailSize.
|
||
impl From<PortThumbnailSize> for ThumbnailSize {
|
||
fn from(size: PortThumbnailSize) -> Self {
|
||
match size {
|
||
PortThumbnailSize::Icon => ThumbnailSize::Icon,
|
||
PortThumbnailSize::Preview => ThumbnailSize::Preview,
|
||
PortThumbnailSize::Large => ThumbnailSize::Large,
|
||
}
|
||
}
|
||
}
|
||
|
||
impl ThumbnailPort for ThumbnailService {
|
||
fn is_supported_image(&self, mime_type: &str) -> bool {
|
||
ThumbnailService::is_supported_image(mime_type)
|
||
}
|
||
|
||
async fn get_thumbnail(
|
||
&self,
|
||
file_id: &str,
|
||
blob_hash: &str,
|
||
size: PortThumbnailSize,
|
||
original_path: &Path,
|
||
) -> Result<Bytes, DomainError> {
|
||
self.get_thumbnail(file_id, blob_hash, size.into(), original_path)
|
||
.await
|
||
.map_err(|e| DomainError::new(ErrorKind::InternalError, "Thumbnail", e.to_string()))
|
||
}
|
||
|
||
fn generate_all_sizes_background(
|
||
self: Arc<Self>,
|
||
file_id: String,
|
||
blob_hash: String,
|
||
original_path: PathBuf,
|
||
) {
|
||
ThumbnailService::generate_all_sizes_background(self, file_id, blob_hash, original_path)
|
||
}
|
||
|
||
async fn delete_thumbnails(&self, file_id: &str) -> Result<(), DomainError> {
|
||
self.delete_thumbnails(file_id)
|
||
.await
|
||
.map_err(|e| DomainError::new(ErrorKind::InternalError, "Thumbnail", e.to_string()))
|
||
}
|
||
|
||
async fn get_cached_thumbnail(
|
||
&self,
|
||
file_id: &str,
|
||
blob_hash: Option<&str>,
|
||
size: PortThumbnailSize,
|
||
) -> Option<Bytes> {
|
||
self.get_cached_thumbnail(file_id, blob_hash, size.into())
|
||
.await
|
||
}
|
||
|
||
async fn store_external_thumbnail(
|
||
&self,
|
||
file_id: &str,
|
||
size: PortThumbnailSize,
|
||
data: Bytes,
|
||
) -> Result<Bytes, DomainError> {
|
||
self.store_external_thumbnail(file_id, size.into(), data)
|
||
.await
|
||
.map_err(|e| DomainError::new(ErrorKind::InternalError, "Thumbnail", e.to_string()))
|
||
}
|
||
|
||
async fn get_stats(&self) -> ThumbnailStatsDto {
|
||
let stats = self.get_stats().await;
|
||
ThumbnailStatsDto {
|
||
cached_thumbnails: stats.cached_thumbnails,
|
||
cache_size_bytes: stats.cache_size_bytes,
|
||
max_cache_bytes: stats.max_cache_bytes,
|
||
}
|
||
}
|
||
}
|
||
|
||
/// Thumbnail service errors
|
||
#[derive(Debug, thiserror::Error)]
|
||
pub enum ThumbnailError {
|
||
#[error("IO error: {0}")]
|
||
IoError(String),
|
||
|
||
#[error("Image processing error: {0}")]
|
||
ImageError(String),
|
||
|
||
#[error("Task error: {0}")]
|
||
TaskError(String),
|
||
|
||
#[error("Unsupported image format")]
|
||
UnsupportedFormat,
|
||
}
|
||
|
||
/// Statistics about the thumbnail cache
|
||
#[derive(Debug, Clone)]
|
||
pub struct ThumbnailStats {
|
||
pub cached_thumbnails: usize,
|
||
pub cache_size_bytes: usize,
|
||
pub max_cache_bytes: usize,
|
||
}
|