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Redis service for rate limiting and task queue.
"""
import os
import json
import logging
from typing import Optional, Dict, Any
from datetime import datetime, timezone
import redis
from redis.exceptions import RedisError
logger = logging.getLogger(__name__)
class RedisService:
"""Singleton Redis connection for rate limiting and task queue."""
_instance = None
_client: Optional[redis.Redis] = None
def __new__(cls):
"""Ensure singleton pattern."""
if cls._instance is None:
cls._instance = super(RedisService, cls).__new__(cls)
return cls._instance
def __init__(self):
"""Initialize Redis connection if not already done."""
if self._client is None:
self._connect()
def _connect(self):
"""Establish Redis connection."""
try:
redis_host = os.getenv("REDIS_HOST", "localhost")
redis_port = int(os.getenv("REDIS_PORT", "6379"))
redis_password = os.getenv("REDIS_PASSWORD")
self._client = redis.Redis(
host=redis_host,
port=redis_port,
password=redis_password if redis_password else None,
decode_responses=True,
socket_connect_timeout=5,
socket_timeout=5
)
# Test connection
self._client.ping()
logger.info("Redis connection established successfully")
except Exception as e:
logger.error(f"Failed to connect to Redis: {str(e)}")
self._client = None
def is_connected(self) -> bool:
"""Check if Redis is connected."""
return self._client is not None
# ==================== RATE LIMITING ====================
def check_rate_limit(
self,
identifier: str,
max_requests: int = 2,
window_seconds: int = 60
) -> tuple[bool, int]:
"""
Check if request should be rate limited.
Args:
identifier: User/device/IP identifier
max_requests: Maximum requests allowed
window_seconds: Time window in seconds
Returns:
Tuple of (is_allowed, current_count)
"""
if not self._client:
# If Redis is down, allow request (fail open)
logger.warning("Redis unavailable, bypassing rate limit")
return True, 0
try:
key = f"ratelimit:{identifier}"
# Increment counter
count = self._client.incr(key)
# Set expiry on first request
if count == 1:
self._client.expire(key, window_seconds)
# Check if limit exceeded
is_allowed = count <= max_requests
return is_allowed, count
except RedisError as e:
logger.error(f"Rate limit check failed: {str(e)}")
# Fail open - allow request if Redis errors
return True, 0
# ==================== IP LOGGING GATE ====================
def should_log_ip(self, device_id: str, ttl_seconds: int = 300) -> bool:
"""
Check if IP should be logged for this device (gated by TTL).
Args:
device_id: Device identifier
ttl_seconds: Time-to-live for gate (default 5 minutes)
Returns:
True if IP should be logged, False if within TTL window
"""
if not self._client:
# If Redis is down, log IP
return True
try:
key = f"iplog:{device_id}"
# Try to set key with NX (only if not exists)
result = self._client.set(key, "1", nx=True, ex=ttl_seconds)
# If set succeeded, IP should be logged
return result is not None
except RedisError as e:
logger.error(f"IP log gate check failed: {str(e)}")
# Fail safe - log IP if Redis errors
return True
# ==================== TASK QUEUE ====================
def enqueue_task(self, job_id: str, task_data: Dict[str, Any]) -> bool:
"""
Add task to Redis queue.
Args:
job_id: Unique job identifier
task_data: Task payload
Returns:
True if enqueued successfully
"""
if not self._client:
logger.error("Redis unavailable, cannot enqueue task")
return False
try:
# Add to queue
queue_key = "absa_tasks"
task_payload = {
"job_id": job_id,
"data": task_data,
"enqueued_at": datetime.now(timezone.utc).isoformat()
}
self._client.rpush(queue_key, json.dumps(task_payload))
# Set initial status
self.set_task_status(job_id, "PENDING")
logger.info(f"Task {job_id} enqueued successfully")
return True
except RedisError as e:
logger.error(f"Failed to enqueue task: {str(e)}")
return False
def dequeue_task(self, timeout: int = 1) -> Optional[Dict[str, Any]]:
"""
Get next task from queue (blocking).
Args:
timeout: Block timeout in seconds
Returns:
Task payload or None
"""
if not self._client:
return None
try:
queue_key = "absa_tasks"
result = self._client.blpop(queue_key, timeout=timeout)
if result:
_, task_json = result
task = json.loads(task_json)
logger.info(f"Dequeued task: {task['job_id']}")
return task
return None
except RedisError as e:
logger.error(f"Failed to dequeue task: {str(e)}")
return None
def set_task_status(
self,
job_id: str,
status: str,
ttl_seconds: int = 3600
) -> bool:
"""
Set task status in Redis.
Args:
job_id: Job identifier
status: Status (PENDING, RUNNING, DONE, FAILED)
ttl_seconds: Time-to-live for status key
Returns:
True if successful
"""
if not self._client:
return False
try:
key = f"job:{job_id}:status"
self._client.set(key, status, ex=ttl_seconds)
return True
except RedisError as e:
logger.error(f"Failed to set task status: {str(e)}")
return False
def get_task_status(self, job_id: str) -> Optional[str]:
"""
Get task status from Redis.
Args:
job_id: Job identifier
Returns:
Status string or None
"""
if not self._client:
return None
try:
key = f"job:{job_id}:status"
status = self._client.get(key)
return status
except RedisError as e:
logger.error(f"Failed to get task status: {str(e)}")
return None
def set_task_result(
self,
job_id: str,
result: Dict[str, Any],
ttl_seconds: int = 3600
) -> bool:
"""
Store task result in Redis.
Args:
job_id: Job identifier
result: Task result data
ttl_seconds: Time-to-live for result
Returns:
True if successful
"""
if not self._client:
return False
try:
key = f"job:{job_id}:result"
self._client.set(key, json.dumps(result), ex=ttl_seconds)
return True
except RedisError as e:
logger.error(f"Failed to set task result: {str(e)}")
return False
def get_task_result(self, job_id: str) -> Optional[Dict[str, Any]]:
"""
Get task result from Redis.
Args:
job_id: Job identifier
Returns:
Result data or None
"""
if not self._client:
return None
try:
key = f"job:{job_id}:result"
result_json = self._client.get(key)
if result_json:
return json.loads(result_json)
return None
except RedisError as e:
logger.error(f"Failed to get task result: {str(e)}")
return None
def close(self):
"""Close Redis connection."""
if self._client:
self._client.close()
self._client = None
logger.info("Redis connection closed")
# Singleton instance
_redis_service = None
def get_redis_service() -> RedisService:
"""Get Redis service singleton."""
global _redis_service
if _redis_service is None:
_redis_service = RedisService()
return _redis_service
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