od-database/crawl_server/task_manager.py
2018-06-24 13:50:55 -04:00

123 lines
3.7 KiB
Python

import config
from crawl_server.database import TaskManagerDatabase, Task, TaskResult
from multiprocessing import Manager, Pool
from apscheduler.schedulers.background import BackgroundScheduler
from datetime import datetime
from crawl_server.crawler import RemoteDirectoryCrawler
from crawl_server.callbacks import PostCrawlCallbackFactory
class TaskManager:
def __init__(self, db_path, max_processes=2):
self.db_path = db_path
self.db = TaskManagerDatabase(db_path)
self.pool = Pool(maxtasksperchild=1, processes=max_processes)
self.max_processes = max_processes
manager = Manager()
self.current_tasks = manager.list()
scheduler = BackgroundScheduler()
scheduler.add_job(self.execute_queued_task, "interval", seconds=1)
scheduler.start()
def put_task(self, task: Task):
self.db.put_task(task)
def get_tasks(self):
return self.db.get_tasks()
def pop_tasks(self):
return self.db.pop_all_tasks()
def get_current_tasks(self):
return self.current_tasks
def get_non_indexed_results(self):
return self.db.get_non_indexed_results()
def get_all_results(self):
return self.db.get_all_results()
def execute_queued_task(self):
if len(self.current_tasks) <= self.max_processes:
task = self.db.pop_task()
if task:
print("pooled " + task.url)
self.current_tasks.append(task)
self.pool.apply_async(
TaskManager.run_task,
args=(task, self.db_path, self.current_tasks),
callback=TaskManager.task_complete,
error_callback=TaskManager.task_error
)
@staticmethod
def run_task(task, db_path, current_tasks):
result = TaskResult()
result.start_time = datetime.utcnow()
result.website_id = task.website_id
print("Starting task " + task.url)
crawler = RemoteDirectoryCrawler(task.url, config.CRAWL_SERVER_THREADS)
crawl_result = crawler.crawl_directory("./crawled/" + str(task.website_id) + ".json")
del crawler
result.file_count = crawl_result.file_count
result.status_code = crawl_result.status_code
result.end_time = datetime.utcnow()
print("End task " + task.url)
callback = PostCrawlCallbackFactory.get_callback(task)
if callback:
callback.run()
print("Executed callback")
return result, db_path, current_tasks
@staticmethod
def task_error(result):
print("TASK ERROR")
raise result
@staticmethod
def task_complete(result):
task_result, db_path, current_tasks = result
print(task_result.status_code)
print(task_result.file_count)
print(task_result.start_time)
print(task_result.end_time)
db = TaskManagerDatabase(db_path)
db.log_result(task_result)
print("Logged result to DB")
for i, task in enumerate(current_tasks):
if task.website_id == task_result.website_id:
del current_tasks[i]
def get_stats(self):
task_results = self.get_all_results()
stats = dict()
if len(task_results) > 0:
stats["task_count"] = len(task_results)
stats["task_time"] = sum((task.end_time - task.start_time) for task in task_results)
stats["task_time_avg"] = stats["task_time"] / len(task_results)
stats["task_file_count"] = sum(task.file_count for task in task_results)
stats["task_file_count_avg"] = stats["task_file_count"] / len(task_results)
return stats