feat(stats): track embedding usage from prompt text — Plan A + hybrid approach docs

.omo/plans/embeddings-hybrid-approach.md

@@ -0,0 +1,181 @@
+# Embeddings Usage Tracking — Hybrid Approach (Plan C)
+
+> **Status**: Reference document for future implementation
+> **Current implementation**: Plan A (prompt text parsing only, see `usage_stats.py:_process_embeddings`)
+> **Next step**: Add Plan B as a supplement when edge-case coverage is needed
+
+## Problem
+
+Embeddings in ComfyUI are not loaded through dedicated ComfyUI nodes like LoRAs or
+Checkpoints. They are resolved during CLIP tokenization when the prompt text contains
+`embedding:<name>` syntax (see `comfy/sd1_clip.py:SDTokenizer.tokenize_with_weights`).
+
+This means the existing metadata_collector hook (which intercepts node execution via
+`_map_node_over_list`) cannot capture embeddings the same way it captures LoRAs and
+checkpoints — there is no "EmbeddingLoader" node to intercept.
+
+## Solution Architecture
+
+The hybrid approach combines **two complementary mechanisms** to capture embedding
+usage from all possible paths.
+
+```
+┌─────────────────────────────────────────────────────────┐
+│                 Plan A (已实现)                          │
+│                                                         │
+│  MetadataRegistry.prompt_metadata["prompts"]            │
+│       │                                                  │
+│       ▼                                                  │
+│  _process_embeddings()                                   │
+│       │                                                  │
+│       ├─ Iterate all prompt node texts                   │
+│       ├─ regex extract "embedding:<name>"                │
+│       ├─ resolve name → sha256 via EmbeddingScanner      │
+│       └─ UsageStats.stats["embeddings"][sha256]++        │
+│                                                         │
+│  Coverage: ~95% — all CLIPTextEncode/Flux/etc nodes     │
+│                                                         │
+│  Gap: Custom nodes that load embeddings programmatically │
+│       without putting embedding:name in prompt text      │
+└─────────────────────────────────────────────────────────┘
+
+                         +
+                         ↓  (future: enable Plan B when needed)
+
+┌─────────────────────────────────────────────────────────┐
+│                 Plan B (未来 — monkey-patch)              │
+│                                                         │
+│  comfy/sd1_clip.py:load_embed()                         │
+│       │                                                  │
+│       ▼                                                  │
+│  Monkey-patch intercepts EVERY embedding file load       │
+│       │                                                  │
+│       ├─ Records embedding_name + success/failure        │
+│       ├─ Associates with current prompt_id (via registry)│
+│       └─ Feeds into UsageStats same as Plan A            │
+│                                                         │
+│  Coverage: 100% — catches ALL embedding loads            │
+│                                                         │
+│  Cost: Requires patching into ComfyUI internals          │
+│        (sd1_clip.py, sdxl_clip.py, some text_encoders)   │
+└─────────────────────────────────────────────────────────┘
+```
+
+## Plan B Detail — Monkey-patch `load_embed`
+
+### Target Function
+
+**`comfy.sd1_clip.load_embed(embedding_name, embedding_directory, embedding_size, embed_key=None)`**
+at line 415 of `sd1_clip.py`.
+
+This is the **single choke point** for all embedding file loads in ComfyUI. Every
+CLIP variant (SD1, SDXL, SD3, Flux) calls this same function.
+
+### Implementation Sketch
+
+```python
+# In metadata_collector/metadata_hook.py (or a new module)
+import comfy.sd1_clip as sd1_clip
+
+_original_load_embed = sd1_clip.load_embed
+
+def _patched_load_embed(embedding_name, embedding_directory, embedding_size, embed_key=None):
+    result = _original_load_embed(
+        embedding_name, embedding_directory, embedding_size, embed_key
+    )
+    if result is not None:
+        _record_embedding_usage(embedding_name)
+    return result
+
+sd1_clip.load_embed = _patched_load_embed
+```
+
+### Prompt ID Association
+
+The challenge is associating the `load_embed` call with the current `prompt_id`.
+Options:
+
+1. **Thread-local / contextvar**: Store current `prompt_id` in a `contextvars.ContextVar`
+   that the metadata_collector sets at the start of each prompt execution.
+
+2. **MetadataRegistry singleton**: The MetadataRegistry already has `current_prompt_id`.
+   The patch can read it directly since both run in the same thread.
+
+3. **Lazy aggregation**: Instead of associating with prompt_id at load time, collect
+   all loaded embedding names in a global set during execution, then flush to
+   UsageStats after the prompt completes.
+
+### Files to Patch
+
+| File | Function | Coverage |
+|------|----------|----------|
+| `comfy/sd1_clip.py:415` | `load_embed()` | Primary — SD1.x, SDXL, SD3, Flux |
+| `comfy/sdxl_clip.py` | Not needed (calls `sd1_clip.SDTokenizer`) | — |
+| `comfy/text_encoders/sd3_clip.py` | Not needed (calls `sd1_clip.SDTokenizer`) | — |
+| `comfy/text_encoders/flux.py` | Not needed (calls `sd1_clip.SDTokenizer`) | — |
+
+The SD1 tokenizer is the base class for all CLIP variants' tokenizers, so patching
+`load_embed` covers them all.
+
+### Edge Cases
+
+| Edge Case | Plan A | Plan B |
+|-----------|--------|--------|
+| `embedding:name` in CLIPTextEncode | ✅ | ✅ |
+| `embedding:name` in CLIPTextEncodeFlux | ✅ | ✅ |
+| `embedding:name` in PromptLM (LoRA Manager) | ✅ | ✅ |
+| `embedding:name` in WAS_Text_to_Conditioning | ✅ | ✅ |
+| Custom node that loads embedding programmatically | ❌ | ✅ |
+| Embedding loaded multiple times in same prompt | ✅ (dedup via set) | ✅ (dedup via set) |
+| Embedding file not found | N/A | ✅ (can log) |
+| Embedding dimension mismatch | N/A | ✅ (can log) |
+| Text encoder with non-standard tokenizer (LLaMA, T5...) | Partial | ✅ (if it calls load_embed) |
+
+## Migration Path: Standalone → Hybrid
+
+### Phase 1 — Plan A (当前状态)
+- Prompt text parsing only
+- No monkey-patching required
+- Covers all standard workflows
+
+### Phase 2 — Enable Plan B (未来工作)
+1. Add monkey-patch of `load_embed` in `metadata_collector/metadata_hook.py` (alongside
+   the existing `_map_node_over_list` hook)
+2. Collect loaded embedding names in a `set()` on the registry
+3. In `UsageStats._process_embeddings()`, merge the Plan A results (from prompt text)
+   with the Plan B results (from the patch)
+4. Add `prompt_data` field on MetadataRegistry to store loaded embeddings per prompt
+
+### Deduplication
+
+```python
+# Merge Plan A + Plan B results in _process_embeddings
+plan_a_names = extract_from_prompt_texts(prompts_data)
+plan_b_names = registry.get_loaded_embeddings(prompt_id)
+
+all_names = plan_a_names | plan_b_names
+```
+
+## Testing the Hybrid
+
+| Scenario | What to verify |
+|----------|---------------|
+| Standard `embedding:name` in prompt | Plan A captures it |
+| Embedding loaded by custom node script | Plan B captures it |
+| Both paths fire for same embedding | No double-counting (dedup) |
+| Embedding name resolves to hash | EmbeddingScanner.get_hash_by_filename works |
+| No embedding scanner available | Graceful skip, no crash |
+| Missing embedding file | Plan B logs warning, Plan A skips gracefully |
+| Empty prompt | No crash, no entries |
+| Standalone mode | Both plans disabled gracefully |
+
+## Key Files Reference
+
+| File | Role |
+|------|------|
+| `py/utils/usage_stats.py` | Core — `_process_embeddings()` for Plan A |
+| `py/metadata_collector/constants.py` | `EMBEDDINGS` category constant |
+| `py/metadata_collector/metadata_hook.py` | Future — monkey-patch for Plan B |
+| `py/services/embedding_scanner.py` | Hash resolution service |
+| `py/routes/stats_routes.py` | Already handles `usage_data.get('embeddings', {})` |
+| `comfy/sd1_clip.py` (ComfyUI) | `load_embed()` — Plan B target |

py/metadata_collector/constants.py

@@ -5,9 +5,10 @@ MODELS = "models"
 PROMPTS = "prompts"
 SAMPLING = "sampling"
 LORAS = "loras"
+EMBEDDINGS = "embeddings"
 SIZE = "size"
 IMAGES = "images"
 IS_SAMPLER = "is_sampler"  # New constant to mark sampler nodes
 
 # Complete list of categories to track
-METADATA_CATEGORIES = [MODELS, PROMPTS, SAMPLING, LORAS, SIZE, IMAGES]
+METADATA_CATEGORIES = [MODELS, PROMPTS, SAMPLING, LORAS, EMBEDDINGS, SIZE, IMAGES]

py/utils/usage_stats.py

@@ -1,4 +1,5 @@
 import os
+import re
 import json
 import time
 import asyncio
@@ -16,14 +17,18 @@ standalone_mode = os.environ.get("LORA_MANAGER_STANDALONE", "0") == "1" or os.en
 # Define constants locally to avoid dependency on conditional imports
 MODELS = "models"
 LORAS = "loras"
+EMBEDDINGS = "embeddings"
+PROMPTS = "prompts"
 
 if not standalone_mode:
     from ..metadata_collector.metadata_registry import MetadataRegistry
     # Import constants from metadata_collector to ensure consistency, but we have fallbacks defined above
     try:
-        from ..metadata_collector.constants import MODELS as _MODELS, LORAS as _LORAS
+        from ..metadata_collector.constants import MODELS as _MODELS, LORAS as _LORAS, EMBEDDINGS as _EMBEDDINGS, PROMPTS as _PROMPTS
         MODELS = _MODELS
         LORAS = _LORAS
+        EMBEDDINGS = _EMBEDDINGS
+        PROMPTS = _PROMPTS
     except ImportError:
         pass  # Use the local definitions
 
@@ -65,6 +70,7 @@ class UsageStats:
         self.stats = {
             "checkpoints": {},  # sha256 -> { total: count, history: { date: count } }
             "loras": {},        # sha256 -> { total: count, history: { date: count } }
+            "embeddings": {},   # sha256 -> { total: count, history: { date: count } }
             "total_executions": 0,
             "last_save_time": 0
         }
@@ -115,6 +121,7 @@ class UsageStats:
         new_stats = {
             "checkpoints": {},
             "loras": {},
+            "embeddings": {},
             "total_executions": old_stats.get("total_executions", 0),
             "last_save_time": old_stats.get("last_save_time", time.time())
         }
@@ -142,21 +149,27 @@ class UsageStats:
                     }
                 }
         
+        # Convert embedding stats (if present in old format)
+        if "embeddings" in old_stats and isinstance(old_stats["embeddings"], dict):
+            for hash_id, count in old_stats["embeddings"].items():
+                new_stats["embeddings"][hash_id] = {
+                    "total": count,
+                    "history": {
+                        today: count
+                    }
+                }
+        
         logger.info("Successfully converted stats from old format to new format with history")
         return new_stats
     
     def _is_old_format(self, stats):
         """Check if the stats are in the old format (direct count values)"""
         # Check if any lora or checkpoint entry is a direct number instead of an object
-        if "loras" in stats and isinstance(stats["loras"], dict):
+        for category in ("loras", "checkpoints", "embeddings"):
-            for hash_id, data in stats["loras"].items():
+            if category in stats and isinstance(stats[category], dict):
-                if isinstance(data, (int, float)):
+                for hash_id, data in stats[category].items():
-                    return True
+                    if isinstance(data, (int, float)):
-                
+                        return True
-        if "checkpoints" in stats and isinstance(stats["checkpoints"], dict):
-            for hash_id, data in stats["checkpoints"].items():
-                if isinstance(data, (int, float)):
-                    return True
         
         return False
     
@@ -304,6 +317,10 @@ class UsageStats:
         if LORAS in metadata and isinstance(metadata[LORAS], dict):
             await self._process_loras(metadata[LORAS], today)
 
+        # Process embeddings — parse prompt text for embedding:name references
+        if PROMPTS in metadata and isinstance(metadata[PROMPTS], dict):
+            await self._process_embeddings(metadata[PROMPTS], today)
+
     def _increment_usage_counter(self, category: str, stat_key: str, today_date: str) -> None:
         """Increment usage counters for a resolved stats key."""
         if stat_key not in self.stats[category]:
@@ -510,6 +527,55 @@ class UsageStats:
         except Exception as e:
             logger.error(f"Error processing LoRA usage: {e}", exc_info=True)
     
+    @staticmethod
+    def _extract_embedding_names(prompt_text: str) -> set:
+        """Parse embedding:name references from prompt text.
+
+        ComfyUI's SDTokenizer resolves ``embedding:<name>`` during tokenization
+        (see ``sd1_clip.py _try_get_embedding``).  This mirrors the same pattern
+        to extract embedding file names from the captured prompt strings.
+        """
+        if not prompt_text:
+            return set()
+        # Matches ``embedding:name`` where name is alphanumeric plus _ . - /
+        names = re.findall(r"embedding:([a-zA-Z0-9_.\-/]+)", prompt_text)
+        return set(names)
+
+    async def _process_embeddings(self, prompts_data, today_date):
+        """Extract embedding usage from prompt texts and record it.
+
+        Iterates every prompt node's text field captured by the metadata
+        collector, extracts ``embedding:<name>`` references, resolves each
+        name to its SHA256 hash via the embedding scanner, and increments
+        usage counters.
+        """
+        try:
+            embedding_scanner = await ServiceRegistry.get_embedding_scanner()
+            if not embedding_scanner:
+                logger.warning("Embedding scanner not available for usage tracking")
+                return
+
+            seen_names = set()
+            for _node_id, prompt_data in prompts_data.items():
+                if not isinstance(prompt_data, dict):
+                    continue
+                for text_field in ("text", "positive_text", "negative_text"):
+                    text = prompt_data.get(text_field)
+                    if isinstance(text, str):
+                        seen_names.update(self._extract_embedding_names(text))
+
+            for emb_name in seen_names:
+                emb_hash = embedding_scanner.get_hash_by_filename(emb_name)
+                if emb_hash:
+                    self._increment_usage_counter("embeddings", emb_hash, today_date)
+                else:
+                    logger.debug(
+                        "No hash found for embedding '%s', skipping usage tracking",
+                        emb_name,
+                    )
+        except Exception as e:
+            logger.error("Error processing embedding usage: %s", e, exc_info=True)
+
     async def get_stats(self):
         """Get current usage statistics"""
         return self.stats
@@ -522,6 +588,9 @@ class UsageStats:
         elif model_type == "lora":
             if sha256 in self.stats["loras"]:
                 return self.stats["loras"][sha256]["total"]
+        elif model_type == "embedding":
+            if sha256 in self.stats["embeddings"]:
+                return self.stats["embeddings"][sha256]["total"]
         return 0
     
     async def process_execution(self, prompt_id):