- sep 15 for #629

sep/sep-015.rst

+=======  ==============================================
+SEP      15
+Title    ScrapyManager and SpiderManager API refactoring
+Author   Insophia Team
+Created  2010-03-10
+Status   Final
+=======  ==============================================
+
+========================================================
+SEP-015: ScrapyManager and SpiderManager API refactoring
+========================================================
+
+This SEP proposes a refactoring of ``ScrapyManager`` and ``SpiderManager``
+APIs.
+
+SpiderManager
+=============
+
+- ``get(spider_name)`` -> ``Spider`` instance
+- ``find_by_request(request)`` -> list of spider names
+- ``list()`` -> list of spider names
+
+- remove ``fromdomain()``, ``fromurl()``
+
+ScrapyManager
+=============
+
+- ``crawl_request(request, spider=None)``
+   - calls ``SpiderManager.find_by_request(request)`` if spider is ``None``
+   - fails if ``len(spiders returned)`` != 1
+- ``crawl_spider(spider)``
+   - calls ``spider.start_requests()``
+- ``crawl_spider_name(spider_name)``
+   - calls ``SpiderManager.get(spider_name)``
+   - calls ``spider.start_requests()``
+- ``crawl_url(url)``
+   - calls ``spider.make_requests_from_url()``
+
+- remove ``crawl()``, ``runonce()``
+
+Instead of using ``runonce()``, commands (such as crawl/parse) would call
+``crawl_*`` and then ``start()``.
+
+Changes to Commands
+===================
+
+- ``if is_url(arg):``
+   - calls ``ScrapyManager.crawl_url(arg)``
+- ``else:``
+   - calls ``ScrapyManager.crawl_spider_name(arg)``
+
+Pending issues
+==============
+
+- should we rename ``ScrapyManager.crawl_*`` to ``schedule_*`` or ``add_*`` ?
+- ``SpiderManager.find_by_request`` or
+  ``SpiderManager.search(request=request)`` ?