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Queue-based architecture for crawler jobs.
Supports Redis and SQS backends.
"""
import json
import asyncio
from typing import Dict, List, Optional, Any
from dataclasses import dataclass, field
from datetime import datetime
from enum import Enum
from pathlib import Path
try:
import redis
REDIS_AVAILABLE = True
except ImportError:
REDIS_AVAILABLE = False
try:
import boto3
SQS_AVAILABLE = True
except ImportError:
SQS_AVAILABLE = False
class JobStatus(Enum):
PENDING = "pending"
PROCESSING = "processing"
COMPLETED = "completed"
FAILED = "failed"
RETRY = "retry"
class QueueBackend(Enum):
REDIS = "redis"
SQS = "sqs"
MEMORY = "memory"
@dataclass
class Job:
"""Represents a crawl job."""
job_id: str
source_id: str
crawler_type: str
payload: Dict = field(default_factory=dict)
status: JobStatus = JobStatus.PENDING
priority: int = 0
retry_count: int = 0
max_retries: int = 3
created_at: str = field(default_factory=lambda: datetime.utcnow().isoformat())
updated_at: str = field(default_factory=lambda: datetime.utcnow().isoformat())
completed_at: Optional[str] = None
error: Optional[str] = None
result: Optional[Dict] = None
def to_dict(self) -> Dict:
return {
"job_id": self.job_id,
"source_id": self.source_id,
"crawler_type": self.crawler_type,
"payload": self.payload,
"status": self.status.value,
"priority": self.priority,
"retry_count": self.retry_count,
"max_retries": self.max_retries,
"created_at": self.created_at,
"updated_at": self.updated_at,
"completed_at": self.completed_at,
"error": self.error,
"result": self.result
}
@classmethod
def from_dict(cls, data: Dict) -> "Job":
return cls(
job_id=data["job_id"],
source_id=data["source_id"],
crawler_type=data["crawler_type"],
payload=data.get("payload", {}),
status=JobStatus(data["status"]),
priority=data.get("priority", 0),
retry_count=data.get("retry_count", 0),
max_retries=data.get("max_retries", 3),
created_at=data.get("created_at", datetime.utcnow().isoformat()),
updated_at=data.get("updated_at", datetime.utcnow().isoformat()),
completed_at=data.get("completed_at"),
error=data.get("error"),
result=data.get("result")
)
class MemoryQueue:
"""In-memory queue for testing/local use."""
def __init__(self):
self.jobs: Dict[str, Job] = {}
self.queue: List[str] = [] # Job IDs in priority order
async def enqueue(self, job: Job) -> bool:
"""Add job to queue."""
self.jobs[job.job_id] = job
self.queue.append(job.job_id)
# Sort by priority (higher priority first)
self.queue.sort(key=lambda jid: -self.jobs[jid].priority)
return True
async def dequeue(self) -> Optional[Job]:
"""Get next job from queue."""
if not self.queue:
return None
job_id = self.queue.pop(0)
job = self.jobs[job_id]
job.status = JobStatus.PROCESSING
job.updated_at = datetime.utcnow().isoformat()
return job
async def update_job(self, job: Job) -> bool:
"""Update job status."""
if job.job_id in self.jobs:
self.jobs[job.job_id] = job
return True
return False
async def get_job(self, job_id: str) -> Optional[Job]:
"""Get job by ID."""
return self.jobs.get(job_id)
def get_stats(self) -> Dict:
"""Get queue statistics."""
return {
"total_jobs": len(self.jobs),
"pending": sum(1 for j in self.jobs.values() if j.status == JobStatus.PENDING),
"processing": sum(1 for j in self.jobs.values() if j.status == JobStatus.PROCESSING),
"completed": sum(1 for j in self.jobs.values() if j.status == JobStatus.COMPLETED),
"failed": sum(1 for j in self.jobs.values() if j.status == JobStatus.FAILED)
}
class RedisQueue:
"""Redis-backed queue for distributed processing."""
def __init__(self, redis_url: str = "redis://localhost:6379", queue_name: str = "crawler_jobs"):
if not REDIS_AVAILABLE:
raise ImportError("redis package not installed")
self.redis_client = redis.from_url(redis_url)
self.queue_name = queue_name
self.job_prefix = f"{queue_name}:job:"
async def enqueue(self, job: Job) -> bool:
"""Add job to Redis queue."""
# Store job data
job_key = f"{self.job_prefix}{job.job_id}"
self.redis_client.set(job_key, json.dumps(job.to_dict()))
# Add to sorted set with priority as score (higher priority = higher score)
self.redis_client.zadd(self.queue_name, {job.job_id: job.priority})
return True
async def dequeue(self) -> Optional[Job]:
"""Get next job from Redis queue."""
# Get highest priority job
result = self.redis_client.zpopmax(self.queue_name)
if not result:
return None
job_id = result[0][0].decode() if isinstance(result[0][0], bytes) else result[0][0]
# Get job data
job_key = f"{self.job_prefix}{job_id}"
job_data = self.redis_client.get(job_key)
if not job_data:
return None
job = Job.from_dict(json.loads(job_data))
job.status = JobStatus.PROCESSING
job.updated_at = datetime.utcnow().isoformat()
# Update job in Redis
self.redis_client.set(job_key, json.dumps(job.to_dict()))
return job
async def update_job(self, job: Job) -> bool:
"""Update job in Redis."""
job_key = f"{self.job_prefix}{job.job_id}"
job.updated_at = datetime.utcnow().isoformat()
if job.status in [JobStatus.COMPLETED, JobStatus.FAILED]:
job.completed_at = datetime.utcnow().isoformat()
self.redis_client.set(job_key, json.dumps(job.to_dict()))
return True
async def get_job(self, job_id: str) -> Optional[Job]:
"""Get job from Redis."""
job_key = f"{self.job_prefix}{job_id}"
job_data = self.redis_client.get(job_key)
if not job_data:
return None
return Job.from_dict(json.loads(job_data))
def get_stats(self) -> Dict:
"""Get queue statistics."""
total = self.redis_client.zcard(self.queue_name)
# Count jobs by status (requires scanning all job keys)
pending = total
processing = 0
completed = 0
failed = 0
for key in self.redis_client.scan_iter(f"{self.job_prefix}*"):
job_data = self.redis_client.get(key)
if job_data:
job = Job.from_dict(json.loads(job_data))
if job.status == JobStatus.PROCESSING:
processing += 1
elif job.status == JobStatus.COMPLETED:
completed += 1
elif job.status == JobStatus.FAILED:
failed += 1
return {
"total_jobs": total + processing + completed + failed,
"pending": pending,
"processing": processing,
"completed": completed,
"failed": failed
}
class JobQueue:
"""Unified job queue interface."""
def __init__(self, backend: QueueBackend = QueueBackend.MEMORY, **kwargs):
self.backend = backend
if backend == QueueBackend.REDIS:
self.queue = RedisQueue(**kwargs)
elif backend == QueueBackend.SQS:
# TODO: Implement SQS backend
raise NotImplementedError("SQS backend not yet implemented")
else:
self.queue = MemoryQueue()
async def submit_job(
self,
source_id: str,
crawler_type: str,
payload: Optional[Dict] = None,
priority: int = 0
) -> Job:
"""Submit a new job to the queue."""
import uuid
job_id = str(uuid.uuid4())
job = Job(
job_id=job_id,
source_id=source_id,
crawler_type=crawler_type,
payload=payload or {},
priority=priority
)
await self.queue.enqueue(job)
return job
async def get_next_job(self) -> Optional[Job]:
"""Get the next job to process."""
return await self.queue.dequeue()
async def update_job_status(self, job: Job, status: JobStatus, result: Optional[Dict] = None, error: Optional[str] = None):
"""Update job status."""
job.status = status
job.updated_at = datetime.utcnow().isoformat()
if result:
job.result = result
if error:
job.error = error
if status in [JobStatus.COMPLETED, JobStatus.FAILED]:
job.completed_at = datetime.utcnow().isoformat()
await self.queue.update_job(job)
async def get_job(self, job_id: str) -> Optional[Job]:
"""Get job by ID."""
return await self.queue.get_job(job_id)
def get_stats(self) -> Dict:
"""Get queue statistics."""
return self.queue.get_stats()
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