Check the HuggingFace cache for an already-downloaded complete model. Returns the snapshot directory path if found with all shards present.
(repo_id: &str)
| 20 | /// Check the HuggingFace cache for an already-downloaded complete model. |
| 21 | /// Returns the snapshot directory path if found with all shards present. |
| 22 | fn find_cached_model(repo_id: &str) -> Option<PathBuf> { |
| 23 | let hf_cache = hf_cache_dir()?; |
| 24 | |
| 25 | // HF cache dirs look like "models--org--model-name" |
| 26 | let cache_dir_name = format!("models--{}", repo_id.replace('/', "--")); |
| 27 | let model_dir = hf_cache.join(&cache_dir_name); |
| 28 | let snapshots_dir = model_dir.join("snapshots"); |
| 29 | |
| 30 | if !snapshots_dir.exists() { |
| 31 | return None; |
| 32 | } |
| 33 | |
| 34 | // Check each snapshot (usually just one, pick the newest) |
| 35 | let mut best: Option<(PathBuf, std::time::SystemTime)> = None; |
| 36 | |
| 37 | for entry in std::fs::read_dir(&snapshots_dir).ok()?.flatten() { |
| 38 | let snap_path = entry.path(); |
| 39 | if !snap_path.is_dir() { |
| 40 | continue; |
| 41 | } |
| 42 | |
| 43 | // Must have config.json |
| 44 | if !snap_path.join("config.json").exists() { |
| 45 | continue; |
| 46 | } |
| 47 | |
| 48 | // Check model completeness |
| 49 | let is_complete = if snap_path.join("model.safetensors").exists() { |
| 50 | true |
| 51 | } else if let Ok(index_data) = |
| 52 | std::fs::read_to_string(snap_path.join("model.safetensors.index.json")) |
| 53 | { |
| 54 | if let Ok(index_json) = serde_json::from_str::<serde_json::Value>(&index_data) { |
| 55 | if let Some(weight_map) = index_json.get("weight_map").and_then(|v| v.as_object()) |
| 56 | { |
| 57 | let expected: HashSet<&str> = |
| 58 | weight_map.values().filter_map(|v| v.as_str()).collect(); |
| 59 | expected.iter().all(|f| snap_path.join(f).exists()) |
| 60 | } else { |
| 61 | false |
| 62 | } |
| 63 | } else { |
| 64 | false |
| 65 | } |
| 66 | } else { |
| 67 | false |
| 68 | }; |
| 69 | |
| 70 | if is_complete { |
| 71 | let mtime = entry |
| 72 | .metadata() |
| 73 | .ok() |
| 74 | .and_then(|m| m.modified().ok()) |
| 75 | .unwrap_or(std::time::SystemTime::UNIX_EPOCH); |
| 76 | if best.as_ref().is_none_or(|(_, t)| mtime > *t) { |
| 77 | best = Some((snap_path, mtime)); |
| 78 | } |
| 79 | } |