我正在使用 celery
(和 django-celery
)来允许用户通过django admin启动定期搜索 . 这是一个更大的项目的一部分,但我把问题归结为一个最小的例子 .
首先,celery / celerybeat正在运行daemonized . 如果我用我的django项目目录 celery -A evofrontend worker -B -l info
然后 I get no issues 奇怪地运行它们 .
当我运行celery / celerybeat作为守护进程然后我得到一个奇怪的导入错误:
[2016-01-06 03:05:12,292: ERROR/MainProcess] Task evosched.tasks.scrapingTask[e18450ad-4dc3-47a0-b03d-4381a0e65c31] raised unexpected: ImportError('No module named myutils',)
Traceback (most recent call last):
File "/home/lee/Desktop/pyco/evo-scraping-min/venv/local/lib/python2.7/site-packages/celery/app/trace.py", line 240, in trace_task
R = retval = fun(*args, **kwargs)
File "/home/lee/Desktop/pyco/evo-scraping-min/venv/local/lib/python2.7/site-packages/celery/app/trace.py", line 438, in __protected_call__
return self.run(*args, **kwargs)
File "evosched/tasks.py", line 35, in scrapingTask
cs = CrawlerScript('TestSpider', scrapy_settings)
File "evosched/tasks.py", line 13, in __init__
self.crawler = CrawlerProcess(scrapy_settings)
File "/home/lee/Desktop/pyco/evo-scraping-min/venv/local/lib/python2.7/site-packages/scrapy/crawler.py", line 209, in __init__
super(CrawlerProcess, self).__init__(settings)
File "/home/lee/Desktop/pyco/evo-scraping-min/venv/local/lib/python2.7/site-packages/scrapy/crawler.py", line 115, in __init__
self.spider_loader = _get_spider_loader(settings)
File "/home/lee/Desktop/pyco/evo-scraping-min/venv/local/lib/python2.7/site-packages/scrapy/crawler.py", line 296, in _get_spider_loader
return loader_cls.from_settings(settings.frozencopy())
File "/home/lee/Desktop/pyco/evo-scraping-min/venv/local/lib/python2.7/site-packages/scrapy/spiderloader.py", line 30, in from_settings
return cls(settings)
File "/home/lee/Desktop/pyco/evo-scraping-min/venv/local/lib/python2.7/site-packages/scrapy/spiderloader.py", line 21, in __init__
for module in walk_modules(name):
File "/home/lee/Desktop/pyco/evo-scraping-min/venv/local/lib/python2.7/site-packages/scrapy/utils/misc.py", line 71, in walk_modules
submod = import_module(fullpath)
File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
__import__(name)
File "retail/spiders/Retail_spider.py", line 16, in <module>
ImportError: No module named myutils
即使蜘蛛从django项目应用程序导入时仍有问题,尽管将相关内容添加到syslog中并执行 django.setup()
.
我的预感是这可能是由初始化期间的" circular import"引起的,但我不确定(有关相同错误的注释,请参阅here)
Celery daemon config
为了完整起见,celeryd和celerybeat配置脚本是:
# /etc/default/celeryd
CELERYD_NODES="worker1"
CELERY_BIN="/home/lee/Desktop/pyco/evo-scraping-min/venv/bin/celery"
CELERY_APP="evofrontend"
DJANGO_SETTINGS_MODULE="evofrontend.settings"
CELERYD_CHDIR="/home/lee/Desktop/pyco/evo-scraping-min/evofrontend"
CELERYD_OPTS="--concurrency=1"
# Workers should run as an unprivileged user.
CELERYD_USER="lee"
CELERYD_GROUP="lee"
CELERY_CREATE_DIRS=1
和
# /etc/default/celerybeat
CELERY_BIN="/home/lee/Desktop/pyco/evo-scraping-min/venv/bin/celery"
CELERY_APP="evofrontend"
CELERYBEAT_CHDIR="/home/lee/Desktop/pyco/evo-scraping-min/evofrontend/"
# Django settings module
export DJANGO_SETTINGS_MODULE="evofrontend.settings"
它们主要基于the generic ones,在我的virtualenv而不是系统中抛出Django设置并使用celery bin .
我也在使用 init.d
脚本the generic ones .
Project structure
至于项目:它住在 /home/lee/Desktop/pyco/evo-scraping-min
. 其下的所有文件都拥有 lee:lee
. dir包含Scrapy(evo-retail)和Django(evofrontend)项目,它们都在它下面,完整的树结构看起来像
├── evofrontend
│ ├── db.sqlite3
│ ├── evofrontend
│ │ ├── celery.py
│ │ ├── __init__.py
│ │ ├── settings.py
│ │ ├── urls.py
│ │ └── wsgi.py
│ ├── evosched
│ │ ├── __init__.py
│ │ ├── myutils.py
│ │ └── tasks.py
│ └── manage.py
└── evo-retail
└── retail
├── logs
├── retail
│ ├── __init__.py
│ ├── settings.py
│ └── spiders
│ ├── __init__.py
│ └── Retail_spider.py
└── scrapy.cfg
Django project relevant files
现在相关文件: evofrontend/evofrontend/celery.py
看起来像
# evofrontend/evofrontend/celery.py
from __future__ import absolute_import
import os
from celery import Celery
# set the default Django settings module for the 'celery' program.
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'evofrontend.settings')
from django.conf import settings
app = Celery('evofrontend')
# Using a string here means the worker will not have to
# pickle the object when using Windows.
app.config_from_object('django.conf:settings')
app.autodiscover_tasks(lambda: settings.INSTALLED_APPS)
Django设置文件 evofrontend/evofrontend/settings.py
中可能相关的设置是
import os
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
PROJECT_ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir))
INSTALLED_APPS = (
...
'djcelery',
'evosched',
)
# Celery settings
BROKER_URL = 'amqp://guest:guest@localhost//'
CELERY_ACCEPT_CONTENT = ['json']
CELERY_TASK_SERIALIZER = 'json'
CELERY_RESULT_SERIALIZER = 'json'
CELERY_TIMEZONE = 'Europe/London'
CELERYD_MAX_TASKS_PER_CHILD = 1 # Each worker is killed after one task, this prevents issues with reactor not being restartable
# Use django-celery backend database
CELERY_RESULT_BACKEND = 'djcelery.backends.database:DatabaseBackend'
# Set periodic task
CELERYBEAT_SCHEDULER = "djcelery.schedulers.DatabaseScheduler"
调度应用程序 evosched
中的 tasks.py
看起来像(它只是在更改目录后使用相关设置启动Scrapy蜘蛛)
# evofrontend/evosched/tasks.py
from __future__ import absolute_import
from celery import shared_task
from celery.utils.log import get_task_logger
logger = get_task_logger(__name__)
import os
from scrapy.crawler import CrawlerProcess
from scrapy.utils.project import get_project_settings
from django.conf import settings as django_settings
class CrawlerScript(object):
def __init__(self, spider, scrapy_settings):
self.crawler = CrawlerProcess(scrapy_settings)
self.spider = spider # just a string
def run(self, **kwargs):
# Pass the kwargs (usually command line args) to the crawler
self.crawler.crawl(self.spider, **kwargs)
self.crawler.start()
@shared_task
def scrapingTask(**kwargs):
logger.info("Start scrape...")
# scrapy.cfg file here pointing to settings...
base_dir = django_settings.BASE_DIR
os.chdir(os.path.join(base_dir, '..', 'evo-retail/retail'))
scrapy_settings = get_project_settings()
# Run crawler
cs = CrawlerScript('TestSpider', scrapy_settings)
cs.run(**kwargs)
evofrontend/evosched/myutils.py
只包含(在这个最小的例子中):
# evofrontend/evosched/myutils.py
SCRAPY_XHR_HEADERS = 'SOMETHING'
Scrapy project relevant files
在完整的Scrapy项目中,设置文件看起来像
# evo-retail/retail/retail/settings.py
BOT_NAME = 'retail'
import os
PROJECT_ROOT = os.path.dirname(os.path.abspath(__file__))
SPIDER_MODULES = ['retail.spiders']
NEWSPIDER_MODULE = 'retail.spiders'
(在这个最小的例子中)蜘蛛就是
# evo-retail/retail/retail/spiders/Retail_spider.py
from scrapy.conf import settings as scrapy_settings
from scrapy.spiders import Spider
from scrapy.http import Request
import sys
import django
import os
import posixpath
SCRAPY_BASE_DIR = scrapy_settings['PROJECT_ROOT']
DJANGO_DIR = posixpath.normpath(os.path.join(SCRAPY_BASE_DIR, '../../../', 'evofrontend'))
sys.path.insert(0, DJANGO_DIR)
os.environ.setdefault("DJANGO_SETTINGS_MODULE", 'evofrontend.settings')
django.setup()
from evosched.myutils import SCRAPY_XHR_HEADERS
class RetailSpider(Spider):
name = "TestSpider"
def start_requests(self):
print SCRAPY_XHR_HEADERS
yield Request(url='http://www.google.com', callback=self.parse)
def parse(self, response):
print response.url
return []
EDIT:
我通过大量的试验和错误发现,如果我尝试导入的应用程序是在我的 INSTALLED_APPS
django设置中,那么它会因导入错误而失败,但如果我从那里删除应用程序,那么我就不再进行导入了错误(例如从 INSTALLED_APPS
删除 evosched
然后蜘蛛中的导入会很好......) . 显然不是解决方案,但可能是一个线索 .
EDIT 2
我在蜘蛛失败导入之前立即打印了 sys.path
,结果是
/home/lee/Desktop/pyco/evo-scraping-min/evofrontend/../evo-retail/retail
/home/lee/Desktop/pyco/evo-scraping-min/venv/lib/python2.7
/home/lee/Desktop/pyco/evo-scraping-min/venv/lib/python2.7/plat-x86_64-linux-gnu
/home/lee/Desktop/pyco/evo-scraping-min/venv/lib/python2.7/lib-tk
/home/lee/Desktop/pyco/evo-scraping-min/venv/lib/python2.7/lib-old
/home/lee/Desktop/pyco/evo-scraping-min/venv/lib/python2.7/lib-dynload
/usr/lib/python2.7
/usr/lib/python2.7/plat-x86_64-linux-gnu
/usr/lib/python2.7/lib-tk
/home/lee/Desktop/pyco/evo-scraping-min/venv/local/lib/python2.7/site-packages
/home/lee/Desktop/pyco/evo-scraping-min/evofrontend
/home/lee/Desktop/pyco/evo-scraping-min/evo-retail/retail`
EDIT 3
如果我做 import evosched
然后 print dir(evosched)
,我看"tasks"如果我选择包含这样的文件,我也可以看到"models",所以从模型导入实际上是可能的 . 但是,我没有看到" myutils" . 即使 from evosched import myutils
失败了,如果将语句放在下面的函数而不是全局函数中也会失败(我认为这可能会导致循环导入问题......) . 直接 import evosched
工作...可能 import evosched.utils
将起作用 . 还没试过......
1 回答
似乎celery守护进程使用系统的python而不是virtualenv中的
python
二进制文件运行 . 你需要使用如上所述here告诉celeryd使用virtualenv中的python运行 .