grabowski/inventree-stock-tool
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feat: Add async background part import queue

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Implements non-blocking part import to prevent UI freezing when scanning unknown parts.

Features:
- Background import worker thread processes unknown parts
- New "Pending Imports" UI section shows import progress
- User can continue scanning other parts while imports run
- Automatic retry on failure (up to 3 attempts)
- Parts automatically processed when import completes

Changes:
- Added PendingPart and ImportResult data structures
- Added PartImportWorker background thread class
- Replaced blocking find_or_import_part() with async find_part()
- Added pending parts queue UI with status display
- Added _on_import_complete() callback handler
- Added _update_pending_parts_ui() for real-time updates
- Added proper cleanup on window close

Benefits:
- No more 30+ second UI freezes during part imports
- Can scan multiple unknown parts in quick succession
- Visual feedback showing import status for each part
- Automatic error handling and retry logic

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Alexander Grabowski
2025-10-29 11:07:50 +07:00
parent 9c742af585
commit 0fdc319774
3 changed files with 398 additions and 41 deletions
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17
README.md
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@@ -8,6 +8,7 @@ A comprehensive barcode scanning application for InvenTree inventory management.
- **Stock Updates**: Update existing stock levels
- **Stock Checking**: Check current stock levels
- **Part Location**: Find where parts are stored
- **Async Part Import**: Non-blocking background import for unknown parts
- **Server Connection Monitoring**: Real-time connection status
- **Barcode Command Support**: Control the app via barcode commands
@@ -61,6 +62,22 @@ token: your-api-token-here
2. **Select Mode**: Choose operation mode (Add Stock, Update Stock, Check Stock, or Locate Part)
3. **Scan Parts**: Scan part barcodes to perform operations
### Async Part Import (New!)
When you scan a part that doesn't exist in the system:
1. **Part is automatically queued** for background import
2. **Continue scanning other parts** - no waiting required!
3. **Watch the "Pending Imports" section** to see import progress
4. **Part is automatically processed** when import completes
5. **Failed imports retry automatically** (up to 3 attempts)
**Benefits**:
- No more UI freezing when importing parts
- Scan multiple unknown parts in quick succession
- Visual feedback showing import progress
- Automatic error handling and retry logic
### Barcode Commands
The application supports special barcode commands for quick mode switching:

309
src/stocktool/stock_tool_gui_v2.py
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@@ -22,10 +22,14 @@ import subprocess
import requests
import yaml
import sys
import threading
import queue
from pathlib import Path
from io import BytesIO
from PIL import Image, ImageTk
from typing import Dict, List, Tuple, Optional, Any
from dataclasses import dataclass
from datetime import datetime
# ============================================================================
# CONFIGURATION & CONSTANTS
@@ -58,6 +62,134 @@ MODE_NAMES = {
'locate': 'Locate Part'
}
# ============================================================================
# IMPORT QUEUE DATA STRUCTURES
# ============================================================================
@dataclass
class PendingPart:
"""Represents a part pending import."""
part_code: str
quantity: Optional[int]
location_id: int
mode: str
timestamp: datetime
retry_count: int = 0
def __str__(self):
return f"{self.part_code} (Qty: {self.quantity or 'N/A'})"
@dataclass
class ImportResult:
"""Result of a part import operation."""
part_code: str
success: bool
part_id: Optional[int] = None
error: Optional[str] = None
class PartImportWorker:
"""Background worker for importing parts."""
def __init__(self, host: str, token: str, callback):
"""
Initialize the import worker.
Args:
host: InvenTree server URL
token: API authentication token
callback: Function to call with ImportResult when import completes
"""
self.host = host
self.token = token
self.callback = callback
self.import_queue = queue.Queue()
self.running = True
self.worker_thread = threading.Thread(target=self._worker_loop, daemon=True)
self.worker_thread.start()
def queue_import(self, part_code: str):
"""Queue a part for import."""
self.import_queue.put(part_code)
def _worker_loop(self):
"""Main worker loop - processes import queue."""
while self.running:
try:
part_code = self.import_queue.get(timeout=1)
result = self._import_part(part_code)
# Call callback on main thread
self.callback(result)
self.import_queue.task_done()
except queue.Empty:
continue
except Exception as e:
print(f"Worker error: {e}")
def _import_part(self, part_code: str) -> ImportResult:
"""
Import a single part.
Args:
part_code: Part code to import
Returns:
ImportResult with success/failure information
"""
try:
# Run the import tool
result = subprocess.run(
['inventree-part-import', part_code],
check=True,
capture_output=True,
text=True,
timeout=30
)
# Search for the part to get its ID
url = f"{self.host}/api/part/"
headers = {'Authorization': f'Token {self.token}'}
r = requests.get(url, headers=headers, params={'search': part_code})
r.raise_for_status()
raw = r.json()
results = raw.get('results', []) if isinstance(raw, dict) else raw
if results:
part_id = results[0].get('pk', results[0].get('id'))
return ImportResult(part_code=part_code, success=True, part_id=part_id)
else:
return ImportResult(
part_code=part_code,
success=False,
error="Part not found after import"
)
except subprocess.TimeoutExpired:
return ImportResult(
part_code=part_code,
success=False,
error="Import timeout (30s)"
)
except subprocess.CalledProcessError as e:
return ImportResult(
part_code=part_code,
success=False,
error=f"Import failed: {e.stderr}"
)
except Exception as e:
return ImportResult(
part_code=part_code,
success=False,
error=str(e)
)
def stop(self):
"""Stop the worker thread."""
self.running = False
if self.worker_thread.is_alive():
self.worker_thread.join(timeout=2)
# ============================================================================
# API FUNCTIONS
# ============================================================================
@@ -108,9 +240,9 @@ def get_locations(host: str, token: str) -> List[Tuple[int, str]]:
return [(loc.get('id', loc.get('pk')), loc.get('name', '')) for loc in locations]
def find_or_import_part(host: str, token: str, part_code: str) -> int:
def find_part(host: str, token: str, part_code: str) -> Optional[int]:
"""
Find part by code or import if not found.
Find part by code (non-blocking).
Args:
host: InvenTree server URL
@@ -118,15 +250,12 @@ def find_or_import_part(host: str, token: str, part_code: str) -> int:
part_code: Part code to search for
Returns:
Part ID
Raises:
RuntimeError: If part cannot be found or imported
Part ID if found, None if not found
"""
url = f"{host}/api/part/"
headers = {'Authorization': f'Token {token}'}
# First, try to find existing part
try:
r = requests.get(url, headers=headers, params={'search': part_code})
r.raise_for_status()
raw = r.json()
@@ -134,20 +263,9 @@ def find_or_import_part(host: str, token: str, part_code: str) -> int:
if results:
return results[0].get('pk', results[0].get('id'))
# Part not found, try to import
subprocess.run(['inventree-part-import', part_code], check=True)
# Search again after import
r = requests.get(url, headers=headers, params={'search': part_code})
r.raise_for_status()
raw = r.json()
results = raw.get('results', []) if isinstance(raw, dict) else raw
if not results:
raise RuntimeError(f"Unable to import part {part_code}")
return results[0].get('pk', results[0].get('id'))
return None
except Exception:
return None
def get_part_info(host: str, token: str, part_id: int) -> Dict[str, Any]:
@@ -390,11 +508,18 @@ class StockApp(tk.Tk):
self.server_connected = tk.BooleanVar(value=False)
self.alive_state = tk.BooleanVar(value=False)
# Part import queue
self.pending_parts: Dict[str, PendingPart] = {} # part_code -> PendingPart
self.import_worker = PartImportWorker(self.host, self.token, self._on_import_complete)
# Initialize UI and start monitoring
self._build_ui()
self._start_connection_monitoring()
self.after(100, lambda: self.loc_entry.focus_set())
# Register cleanup on window close
self.protocol("WM_DELETE_WINDOW", self._on_closing)
# ========================================================================
# CONNECTION MONITORING
# ========================================================================
@@ -458,6 +583,7 @@ class StockApp(tk.Tk):
self._create_location_section()
self._create_mode_section()
self._create_scan_section()
self._create_pending_parts_section()
self._create_info_section()
self._create_log_section()
@@ -558,6 +684,37 @@ class StockApp(tk.Tk):
self.scan_entry.bind("<Return>", lambda e: self.process_scan())
scan_frm.columnconfigure(1, weight=1)
def _create_pending_parts_section(self):
"""Create pending parts import queue section."""
pending_frm = ttk.LabelFrame(self, text="Pending Imports (0)", padding=10)
pending_frm.pack(fill=tk.X, padx=10, pady=(0, 10))
# Create frame for pending parts list
list_frame = ttk.Frame(pending_frm)
list_frame.pack(fill=tk.BOTH, expand=True)
# Create Treeview for pending parts
columns = ('Part Code', 'Qty', 'Mode', 'Status')
self.pending_tree = ttk.Treeview(list_frame, columns=columns, show='headings', height=3)
self.pending_tree.heading('Part Code', text='Part Code')
self.pending_tree.heading('Qty', text='Qty')
self.pending_tree.heading('Mode', text='Mode')
self.pending_tree.heading('Status', text='Status')
self.pending_tree.column('Part Code', width=180)
self.pending_tree.column('Qty', width=60)
self.pending_tree.column('Mode', width=100)
self.pending_tree.column('Status', width=150)
# Scrollbar for pending parts
scrollbar = ttk.Scrollbar(list_frame, orient=tk.VERTICAL, command=self.pending_tree.yview)
self.pending_tree.configure(yscrollcommand=scrollbar.set)
self.pending_tree.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)
scrollbar.pack(side=tk.RIGHT, fill=tk.Y)
# Store reference to frame for updating title
self.pending_frame = pending_frm
def _create_info_section(self):
"""Create part information display section."""
info_frm = ttk.LabelFrame(self, text="Part Information", padding=10)
@@ -760,14 +917,22 @@ class StockApp(tk.Tk):
"""Process a scanned part."""
try:
self.log_msg(f"🔎 Looking up part: {part_code}", debug=True)
pid = find_or_import_part(self.host, self.token, part_code)
self.log_msg(f"✅ Found part ID: {pid}", debug=True)
# Check if part already exists
pid = find_part(self.host, self.token, part_code)
if pid is not None:
# Part found - process normally
self.log_msg(f"✅ Found part ID: {pid}", debug=True)
self._show_part_info(pid)
self._execute_stock_operation(pid, part_code, quantity)
else:
# Part not found - queue for import
self.log_msg(f"⏳ Part '{part_code}' not found - queuing for import...")
self._queue_part_for_import(part_code, quantity)
except Exception as e:
self.log_msg(f"✖ Part lookup/import failed: {e}")
self.log_msg(f"✖ Part lookup failed: {e}")
import traceback
self.log_msg(f"Traceback: {traceback.format_exc()}", debug=True)
@@ -784,6 +949,102 @@ class StockApp(tk.Tk):
else: # check mode
self._check_stock(part_id, part_code)
# ========================================================================
# PENDING PARTS MANAGEMENT
# ========================================================================
def _queue_part_for_import(self, part_code: str, quantity: Optional[int]):
"""Queue a part for background import."""
if part_code in self.pending_parts:
self.log_msg(f"⚠ Part '{part_code}' already queued for import")
return
# Create pending part entry
pending_part = PendingPart(
part_code=part_code,
quantity=quantity,
location_id=self.current_loc if self.current_loc else 0,
mode=self.mode.get(),
timestamp=datetime.now()
)
self.pending_parts[part_code] = pending_part
# Queue for import
self.import_worker.queue_import(part_code)
# Update UI
self._update_pending_parts_ui()
self.log_msg(f"📋 Added '{part_code}' to import queue - continue scanning other parts")
def _on_import_complete(self, result: ImportResult):
"""
Handle import completion callback (runs on worker thread).
Schedule UI update on main thread.
"""
self.after(0, lambda: self._process_import_result(result))
def _process_import_result(self, result: ImportResult):
"""Process import result on main thread."""
pending_part = self.pending_parts.get(result.part_code)
if not pending_part:
return
if result.success:
self.log_msg(f"✅ Import complete for '{result.part_code}' (ID: {result.part_id})")
# Execute the pending operation
try:
self._show_part_info(result.part_id)
self._execute_stock_operation(result.part_id, result.part_code, pending_part.quantity)
self.log_msg(f"✔ Processed pending operation for '{result.part_code}'")
except Exception as e:
self.log_msg(f"✖ Error processing '{result.part_code}': {e}")
# Remove from pending
del self.pending_parts[result.part_code]
else:
# Import failed
pending_part.retry_count += 1
if pending_part.retry_count >= 3:
self.log_msg(f"✖ Import failed for '{result.part_code}' after 3 attempts: {result.error}")
del self.pending_parts[result.part_code]
else:
self.log_msg(f"⚠ Import failed for '{result.part_code}': {result.error} (retry {pending_part.retry_count}/3)")
# Retry
self.import_worker.queue_import(result.part_code)
# Update UI
self._update_pending_parts_ui()
def _update_pending_parts_ui(self):
"""Update the pending parts UI display."""
# Clear existing items
for item in self.pending_tree.get_children():
self.pending_tree.delete(item)
# Update frame title with count
count = len(self.pending_parts)
self.pending_frame.config(text=f"Pending Imports ({count})")
# Add pending parts to tree
for part_code, pending_part in self.pending_parts.items():
qty_str = str(pending_part.quantity) if pending_part.quantity else "N/A"
mode_str = MODE_NAMES.get(pending_part.mode, pending_part.mode)
status = f"Importing... (attempt {pending_part.retry_count + 1})"
self.pending_tree.insert('', 'end', values=(
part_code,
qty_str,
mode_str,
status
))
def _on_closing(self):
"""Handle application closing."""
self.log_msg("Shutting down import worker...")
self.import_worker.stop()
self.destroy()
# ========================================================================
# STOCK OPERATIONS
# ========================================================================

79
test_async_import.py Normal file
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@@ -0,0 +1,79 @@
#!/usr/bin/env python3
"""
Test script to demonstrate async import functionality.
This script shows how the new async import feature works when parts
are not found in the system.
"""
import sys
from stocktool.stock_tool_gui_v2 import find_part, ImportResult, PartImportWorker
def test_find_part():
"""Test the find_part function."""
print("Testing find_part function...")
print("- This is a non-blocking call that returns None if part not found")
print("- No longer blocks on subprocess.run() like the old find_or_import_part")
print()
def test_import_worker():
"""Test the import worker."""
print("Testing PartImportWorker...")
print("- Background worker runs in a separate thread")
print("- Processes import queue one at a time")
print("- Calls callback with ImportResult when complete")
print("- User can continue scanning other parts while import runs")
print()
def test_pending_parts_ui():
"""Test the pending parts UI."""
print("Testing Pending Parts UI...")
print("- New 'Pending Imports' section shows parts being imported")
print("- Displays: Part Code, Qty, Mode, Status")
print("- Updates automatically when imports complete")
print("- Shows retry count if import fails")
print()
def main():
print("=" * 70)
print("Async Part Import Feature Test")
print("=" * 70)
print()
print("NEW BEHAVIOR:")
print("1. User scans unknown part (e.g., NEW-PART-123)")
print("2. System checks inventory - not found")
print("3. Part is added to 'Pending Imports' queue")
print("4. Import starts in background thread")
print("5. User can immediately continue scanning other parts")
print("6. When import completes, part is automatically processed")
print()
print("OLD BEHAVIOR (BLOCKING):")
print("1. User scans unknown part")
print("2. System calls inventree-part-import")
print("3. UI FREEZES waiting for subprocess to complete")
print("4. User cannot scan anything else")
print("5. Process can take 30+ seconds per part")
print()
test_find_part()
test_import_worker()
test_pending_parts_ui()
print("=" * 70)
print("BENEFITS:")
print("- No more UI freezing when importing parts")
print("- Can scan multiple unknown parts in quick succession")
print("- Visual feedback showing import progress")
print("- Automatic retry on failure (up to 3 attempts)")
print("- Import happens in background while user continues working")
print("=" * 70)
if __name__ == "__main__":
main()