Create app.py

app.py

@@ -0,0 +1,645 @@
+import os
+import time
+import asyncio
+import uuid
+from datetime import datetime
+from typing import Dict, List, Optional
+from collections import deque
+from fastapi import FastAPI, HTTPException, Request
+from fastapi.middleware.cors import CORSMiddleware
+from pydantic import BaseModel
+import requests
+import threading
+
+# Configuration
+ORCHESTRATOR_VERSION = "1.0.0"
+WORKER_HEALTH_CHECK_INTERVAL = 30  # seconds
+WORKER_TIMEOUT = 120  # seconds for translation
+
+# Models
+class TranslationRequest(BaseModel):
+    request_id: str
+    text: str
+    source_lang: str
+    target_lang: str
+    auto_charge: bool = False
+    notification_url: Optional[str] = None
+    wordpress_user_id: Optional[int] = None
+
+class WorkerConfig(BaseModel):
+    url: str
+    name: str
+    priority: int = 1
+    max_concurrent: int = 3
+
+class WorkerStatus:
+    def __init__(self, config: WorkerConfig):
+        self.config = config
+        self.available = False
+        self.active_jobs = 0
+        self.last_health_check = 0
+        self.total_completed = 0
+        self.total_failed = 0
+        self.avg_response_time = 0.0
+
+# Orchestrator Core Class
+class TranslationOrchestrator:
+    def __init__(self):
+        self.workers: Dict[str, WorkerStatus] = {}
+        self.job_queue = deque()
+        self.active_jobs: Dict[str, Dict] = {}
+        self.completed_jobs: Dict[str, Dict] = {}
+        self.worker_lock = threading.Lock()
+        self.job_lock = threading.Lock()
+        
+        # Load worker configurations from environment
+        self.load_worker_configs()
+        
+        # Start background tasks
+        self.start_health_checker()
+        self.start_job_processor()
+        
+    def load_worker_configs(self):
+        """Load worker configurations from environment variables"""
+        # Format: WORKER_1_URL=https://..., WORKER_1_NAME=Worker1, etc.
+        worker_index = 1
+        while True:
+            url_key = f"WORKER_{worker_index}_URL"
+            name_key = f"WORKER_{worker_index}_NAME"
+            
+            url = os.getenv(url_key)
+            if not url:
+                break
+                
+            name = os.getenv(name_key, f"Worker {worker_index}")
+            priority = int(os.getenv(f"WORKER_{worker_index}_PRIORITY", "1"))
+            max_concurrent = int(os.getenv(f"WORKER_{worker_index}_MAX_CONCURRENT", "3"))
+            
+            worker_id = f"worker_{worker_index}"
+            config = WorkerConfig(
+                url=url,
+                name=name,
+                priority=priority,
+                max_concurrent=max_concurrent
+            )
+            
+            self.workers[worker_id] = WorkerStatus(config)
+            print(f"✓ Loaded worker: {name} at {url}")
+            
+            worker_index += 1
+        
+        if not self.workers:
+            print("⚠ No workers configured. Add WORKER_N_URL environment variables.")
+
+
+    def start_health_checker(self):
+            """Start background thread for health checking"""
+            def health_check_loop():
+                while True:
+                    self.check_all_workers_health()
+                    time.sleep(WORKER_HEALTH_CHECK_INTERVAL)
+            
+            thread = threading.Thread(target=health_check_loop, daemon=True)
+            thread.start()
+            print("✓ Health checker started")
+    
+    def check_all_workers_health(self):
+        """Check health of all workers"""
+        with self.worker_lock:
+            for worker_id, worker in self.workers.items():
+                try:
+                    response = requests.get(
+                        f"{worker.config.url}/api/health",
+                        timeout=10
+                    )
+                    
+                    if response.status_code == 200:
+                        data = response.json()
+                        worker.available = data.get('status') == 'healthy'
+                        worker.last_health_check = time.time()
+                        
+                        if worker.available:
+                            print(f"✓ {worker.config.name}: Healthy")
+                        else:
+                            print(f"✗ {worker.config.name}: Unhealthy")
+                    else:
+                        worker.available = False
+                        print(f"✗ {worker.config.name}: HTTP {response.status_code}")
+                        
+                except Exception as e:
+                    worker.available = False
+                    print(f"✗ {worker.config.name}: {str(e)}")
+    
+    def get_available_worker(self) -> Optional[str]:
+        """Get an available worker based on priority and load"""
+        with self.worker_lock:
+            available_workers = [
+                (worker_id, worker) 
+                for worker_id, worker in self.workers.items()
+                if worker.available and worker.active_jobs < worker.config.max_concurrent
+            ]
+            
+            if not available_workers:
+                return None
+            
+            # Sort by priority (higher first) then by active jobs (fewer first)
+            available_workers.sort(
+                key=lambda x: (-x[1].config.priority, x[1].active_jobs)
+            )
+            
+            return available_workers[0][0]            
+
+    def start_job_processor(self):
+        """Start background thread for processing job queue"""
+        def process_queue_loop():
+            while True:
+                self.process_job_queue()
+                time.sleep(2)  # Check queue every 2 seconds
+        
+        thread = threading.Thread(target=process_queue_loop, daemon=True)
+        thread.start()
+        print("✓ Job processor started")
+    
+    def add_job_to_queue(self, job_data: Dict):
+        """Add a job to the queue"""
+        with self.job_lock:
+            self.job_queue.append(job_data)
+            print(f"📝 Job {job_data['request_id']} added to queue. Queue size: {len(self.job_queue)}")
+    
+    def process_job_queue(self):
+        """Process pending jobs in queue"""
+        if not self.job_queue:
+            return
+        
+        with self.job_lock:
+            if not self.job_queue:
+                return
+            
+            worker_id = self.get_available_worker()
+            if not worker_id:
+                return  # No available workers
+            
+            job_data = self.job_queue.popleft()
+            
+        # Process outside lock to avoid blocking
+        self.assign_job_to_worker(worker_id, job_data)
+    
+    def assign_job_to_worker(self, worker_id: str, job_data: Dict):
+        """Assign a job to a specific worker"""
+        worker = self.workers[worker_id]
+        request_id = job_data['request_id']
+        
+        print(f"🔄 Assigning job {request_id} to {worker.config.name}")
+        
+        with self.worker_lock:
+            worker.active_jobs += 1
+        
+        # Store job info
+        self.active_jobs[request_id] = {
+            'worker_id': worker_id,
+            'job_data': job_data,
+            'start_time': time.time(),
+            'status': 'processing'
+        }
+        
+        # Send to worker in background
+        thread = threading.Thread(
+            target=self.send_to_worker,
+            args=(worker_id, job_data),
+            daemon=True
+        )
+        thread.start()
+
+    def send_to_worker(self, worker_id: str, job_data: Dict):
+        """Send translation job to worker"""
+        worker = self.workers[worker_id]
+        request_id = job_data['request_id']
+        
+        try:
+            # Prepare request for worker
+            worker_request = {
+                'request_id': request_id,
+                'text': job_data['text'],
+                'source_lang': job_data['source_lang'],
+                'target_lang': job_data['target_lang'],
+                'auto_charge': job_data.get('auto_charge', False),
+                'notification_url': None  # Don't let worker notify WordPress directly
+            }
+            
+            response = requests.post(
+                f"{worker.config.url}/api/translate/heavy",
+                json=worker_request,
+                timeout=WORKER_TIMEOUT
+            )
+            
+            if response.status_code == 200:
+                print(f"✓ Job {request_id} sent to {worker.config.name}")
+                self.monitor_worker_job(worker_id, request_id)
+            else:
+                self.handle_worker_failure(worker_id, request_id, f"HTTP {response.status_code}")
+                
+        except Exception as e:
+            self.handle_worker_failure(worker_id, request_id, str(e))
+    
+    def monitor_worker_job(self, worker_id: str, request_id: str):
+        """Monitor job progress on worker"""
+        worker = self.workers[worker_id]
+        max_checks = 60  # Maximum 5 minutes (60 * 5 seconds)
+        check_count = 0
+        
+        while check_count < max_checks:
+            time.sleep(5)
+            check_count += 1
+            
+            try:
+                # Check status on worker
+                response = requests.post(
+                    f"{worker.config.url}/api/check-translation-status",
+                    json={'request_id': request_id},
+                    timeout=15
+                )
+                
+                if response.status_code == 200:
+                    data = response.json()
+                    
+                    if data.get('success') and data.get('status') == 'completed':
+                        # Job completed successfully
+                        self.handle_job_completion(worker_id, request_id, data)
+                        return
+                    elif data.get('status') == 'failed':
+                        self.handle_worker_failure(worker_id, request_id, "Worker reported failure")
+                        return
+                        
+            except Exception as e:
+                print(f"⚠ Error checking job {request_id}: {str(e)}")
+        
+        # Timeout reached
+        self.handle_worker_failure(worker_id, request_id, "Timeout waiting for completion")                
+
+
+
+
+    def handle_job_completion(self, worker_id: str, request_id: str, worker_response: Dict):
+            """Handle successful job completion"""
+            worker = self.workers[worker_id]
+            
+            print(f"✅ Job {request_id} completed by {worker.config.name}")
+            
+            # Update worker stats
+            with self.worker_lock:
+                worker.active_jobs -= 1
+                worker.total_completed += 1
+            
+            # Get job data
+            job_info = self.active_jobs.get(request_id, {})
+            job_data = job_info.get('job_data', {})
+            
+            # Calculate processing time
+            processing_time = time.time() - job_info.get('start_time', time.time())
+            
+            # Prepare completion data
+            completion_data = {
+                'request_id': request_id,
+                'status': 'completed',
+                'translated_text': worker_response.get('translated_text'),
+                'processing_time': processing_time,
+                'character_count': worker_response.get('character_count', len(job_data.get('text', ''))),
+                'translation_length': worker_response.get('translation_length', 0),
+                'from_cache': worker_response.get('from_cache', False),
+                'worker_name': worker.config.name,
+                'completed_at': datetime.now().isoformat()
+            }
+            
+            # Store in completed jobs
+            self.completed_jobs[request_id] = completion_data
+            
+            # Remove from active jobs
+            if request_id in self.active_jobs:
+                del self.active_jobs[request_id]
+            
+            # Notify WordPress if notification URL provided
+            notification_url = job_data.get('notification_url')
+            if notification_url:
+                self.notify_wordpress(notification_url, completion_data)
+    
+    def handle_worker_failure(self, worker_id: str, request_id: str, error_message: str):
+        """Handle job failure"""
+        worker = self.workers[worker_id]
+        
+        print(f"❌ Job {request_id} failed on {worker.config.name}: {error_message}")
+        
+        # Update worker stats
+        with self.worker_lock:
+            worker.active_jobs -= 1
+            worker.total_failed += 1
+        
+        # Get job data
+        job_info = self.active_jobs.get(request_id, {})
+        job_data = job_info.get('job_data', {})
+        
+        # Try to reassign to another worker
+        if job_info.get('retry_count', 0) < 2:  # Maximum 2 retries
+            print(f"🔄 Retrying job {request_id} (attempt {job_info.get('retry_count', 0) + 1})")
+            
+            job_data['retry_count'] = job_info.get('retry_count', 0) + 1
+            self.add_job_to_queue(job_data)
+            
+            # Remove from active jobs
+            if request_id in self.active_jobs:
+                del self.active_jobs[request_id]
+        else:
+            # Max retries reached, mark as failed
+            failure_data = {
+                'request_id': request_id,
+                'status': 'failed',
+                'error_message': error_message,
+                'failed_at': datetime.now().isoformat()
+            }
+            
+            self.completed_jobs[request_id] = failure_data
+            
+            # Remove from active jobs
+            if request_id in self.active_jobs:
+                del self.active_jobs[request_id]
+            
+            # Notify WordPress of failure
+            notification_url = job_data.get('notification_url')
+            if notification_url:
+                self.notify_wordpress(notification_url, failure_data)
+    
+    def notify_wordpress(self, notification_url: str, data: Dict):
+        """Send notification to WordPress"""
+        try:
+            response = requests.post(
+                notification_url,
+                json=data,
+                timeout=30,
+                verify=False
+            )
+            
+            if response.status_code == 200:
+                print(f"📤 WordPress notified successfully for {data['request_id']}")
+            else:
+                print(f"⚠ WordPress notification failed: HTTP {response.status_code}")
+                
+        except Exception as e:
+            print(f"⚠ WordPress notification error: {str(e)}")
+
+# Initialize FastAPI app
+app = FastAPI(
+    title="Translation Orchestrator",
+    description="Main orchestrator for distributed translation system",
+    version=ORCHESTRATOR_VERSION
+)
+
+# CORS configuration
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Initialize orchestrator
+orchestrator = TranslationOrchestrator()
+
+# Root endpoint
+@app.get("/")
+async def root():
+    """API information"""
+    return {
+        "service": "Translation Orchestrator",
+        "version": ORCHESTRATOR_VERSION,
+        "status": "running",
+        "workers": len(orchestrator.workers),
+        "active_jobs": len(orchestrator.active_jobs),
+        "queued_jobs": len(orchestrator.job_queue),
+        "endpoints": {
+            "/api/translate": "Submit translation request",
+            "/api/status/{request_id}": "Check translation status",
+            "/api/workers": "List all workers",
+            "/api/health": "Health check"
+        }
+    }
+
+# Health check endpoint
+@app.get("/api/health")
+async def health_check():
+    """Health check"""
+    available_workers = sum(1 for w in orchestrator.workers.values() if w.available)
+    
+    return {
+        "status": "healthy" if available_workers > 0 else "degraded",
+        "timestamp": datetime.now().isoformat(),
+        "workers": {
+            "total": len(orchestrator.workers),
+            "available": available_workers,
+            "unavailable": len(orchestrator.workers) - available_workers
+        },
+        "queue": {
+            "active_jobs": len(orchestrator.active_jobs),
+            "queued_jobs": len(orchestrator.job_queue),
+            "completed_jobs": len(orchestrator.completed_jobs)
+        }
+    }
+
+# Submit translation request
+@app.post("/api/translate")
+async def submit_translation(request: TranslationRequest):
+    """Submit a translation request"""
+    
+    # Check if any workers available
+    if not any(w.available for w in orchestrator.workers.values()):
+        raise HTTPException(
+            status_code=503,
+            detail="No workers available at the moment. Please try again later."
+        )
+    
+    # Prepare job data
+    job_data = {
+        'request_id': request.request_id,
+        'text': request.text,
+        'source_lang': request.source_lang,
+        'target_lang': request.target_lang,
+        'auto_charge': request.auto_charge,
+        'notification_url': request.notification_url,
+        'wordpress_user_id': request.wordpress_user_id,
+        'retry_count': 0
+    }
+    
+    # Add to queue
+    orchestrator.add_job_to_queue(job_data)
+    
+    return {
+        "success": True,
+        "request_id": request.request_id,
+        "status": "queued",
+        "message": "Translation request queued successfully",
+        "queue_position": len(orchestrator.job_queue),
+        "estimated_wait_time": len(orchestrator.job_queue) * 10  # Rough estimate
+    }
+
+# Check translation status
+@app.get("/api/status/{request_id}")
+async def check_status(request_id: str):
+    """Check status of a translation request"""
+    
+    # Check completed jobs
+    if request_id in orchestrator.completed_jobs:
+        return {
+            "success": True,
+            **orchestrator.completed_jobs[request_id]
+        }
+    
+    # Check active jobs
+    if request_id in orchestrator.active_jobs:
+        job_info = orchestrator.active_jobs[request_id]
+        elapsed_time = time.time() - job_info['start_time']
+        
+        return {
+            "success": True,
+            "request_id": request_id,
+            "status": "processing",
+            "worker_id": job_info['worker_id'],
+            "elapsed_time": elapsed_time,
+            "message": "Translation in progress"
+        }
+    
+    # Check queue
+    for job in orchestrator.job_queue:
+        if job['request_id'] == request_id:
+            return {
+                "success": True,
+                "request_id": request_id,
+                "status": "queued",
+                "message": "Translation request is queued"
+            }
+    
+    # Not found
+    return {
+        "success": False,
+        "request_id": request_id,
+        "status": "not_found",
+        "message": "Translation request not found"
+    }
+
+# List workers
+@app.get("/api/workers")
+async def list_workers():
+    """List all workers and their status"""
+    workers_info = []
+    
+    for worker_id, worker in orchestrator.workers.items():
+        workers_info.append({
+            "id": worker_id,
+            "name": worker.config.name,
+            "url": worker.config.url,
+            "available": worker.available,
+            "active_jobs": worker.active_jobs,
+            "max_concurrent": worker.config.max_concurrent,
+            "priority": worker.config.priority,
+            "total_completed": worker.total_completed,
+            "total_failed": worker.total_failed,
+            "last_health_check": worker.last_health_check
+        })
+    
+    return {
+        "success": True,
+        "workers": workers_info
+    }
+
+# Add worker dynamically (admin endpoint)
+@app.post("/api/admin/add-worker")
+async def add_worker(config: WorkerConfig):
+    """Add a new worker (admin only - add authentication in production)"""
+    
+    worker_id = f"worker_{len(orchestrator.workers) + 1}"
+    
+    with orchestrator.worker_lock:
+        orchestrator.workers[worker_id] = WorkerStatus(config)
+    
+    # Immediate health check
+    orchestrator.check_all_workers_health()
+    
+    return {
+        "success": True,
+        "worker_id": worker_id,
+        "message": f"Worker {config.name} added successfully"
+    }
+
+# Remove worker
+@app.delete("/api/admin/remove-worker/{worker_id}")
+async def remove_worker(worker_id: str):
+    """Remove a worker (admin only - add authentication in production)"""
+    
+    if worker_id not in orchestrator.workers:
+        raise HTTPException(status_code=404, detail="Worker not found")
+    
+    worker = orchestrator.workers[worker_id]
+    
+    # Check if worker has active jobs
+    if worker.active_jobs > 0:
+        raise HTTPException(
+            status_code=400,
+            detail=f"Cannot remove worker with {worker.active_jobs} active jobs"
+        )
+    
+    with orchestrator.worker_lock:
+        del orchestrator.workers[worker_id]
+    
+    return {
+        "success": True,
+        "message": f"Worker {worker_id} removed successfully"
+    }
+
+# Force health check
+@app.post("/api/admin/health-check")
+async def force_health_check():
+    """Force immediate health check of all workers"""
+    orchestrator.check_all_workers_health()
+    
+    return {
+        "success": True,
+        "message": "Health check completed",
+        "timestamp": datetime.now().isoformat()
+    }
+
+# Get statistics
+@app.get("/api/stats")
+async def get_statistics():
+    """Get orchestrator statistics"""
+    
+    total_completed = sum(w.total_completed for w in orchestrator.workers.values())
+    total_failed = sum(w.total_failed for w in orchestrator.workers.values())
+    
+    return {
+        "success": True,
+        "statistics": {
+            "total_workers": len(orchestrator.workers),
+            "available_workers": sum(1 for w in orchestrator.workers.values() if w.available),
+            "active_jobs": len(orchestrator.active_jobs),
+            "queued_jobs": len(orchestrator.job_queue),
+            "completed_jobs": len(orchestrator.completed_jobs),
+            "total_completed": total_completed,
+            "total_failed": total_failed,
+            "success_rate": (total_completed / (total_completed + total_failed) * 100) if (total_completed + total_failed) > 0 else 0
+        }
+    }
+
+# Main entry point
+if __name__ == "__main__":
+    import uvicorn
+    
+    port = int(os.getenv("PORT", 7860))
+    
+    print(f"🚀 Translation Orchestrator v{ORCHESTRATOR_VERSION}")
+    print(f"📡 Starting on port {port}")
+    print(f"👷 Workers configured: {len(orchestrator.workers)}")
+    
+    uvicorn.run(
+        app,
+        host="0.0.0.0",
+        port=port,
+        log_level="info"
+    )