How to set different scrapy-settings for different spiders?

Question

I want to enable some http-proxy for some spiders, and disable them for other spiders.

Can I do something like this?

# settings.py
proxy_spiders = ['a1' , b2']

if spider in proxy_spider: #how to get spider name ???
    HTTP_PROXY = 'http://127.0.0.1:8123'
    DOWNLOADER_MIDDLEWARES = {
         'myproject.middlewares.RandomUserAgentMiddleware': 400,
         'myproject.middlewares.ProxyMiddleware': 410,
         'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware': None
    }
else:
    DOWNLOADER_MIDDLEWARES = {
         'myproject.middlewares.RandomUserAgentMiddleware': 400,
         'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware': None
    }

If the code above doesn't work, is there any other suggestion?

Answer 1

a bit late, but since release 1.0.0 there is a new feature in scrapy where you can override settings per spider like this:

class MySpider(scrapy.Spider):
    name = "my_spider"
    custom_settings = {"HTTP_PROXY":'http://127.0.0.1:8123',
                       "DOWNLOADER_MIDDLEWARES": {'myproject.middlewares.RandomUserAgentMiddleware': 400,
                                                  'myproject.middlewares.ProxyMiddleware': 410,
                                                  'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware': None}}




class MySpider2(scrapy.Spider):
        name = "my_spider2"
        custom_settings = {"DOWNLOADER_MIDDLEWARES": {'myproject.middlewares.RandomUserAgentMiddleware': 400,
                                                      'scrapy.contrib.downloadermiddleware.useragent.UserAgentMiddleware': None}}

Answer 2

There is a new and easier way to do this.

class MySpider(scrapy.Spider):
    name = 'myspider'

    custom_settings = {
        'SOME_SETTING': 'some value',
    }

I use Scrapy 1.3.1