[MRG+1] [image_pipeline] bring back uppercase class attributes #1989

pawelmhm · 2016-05-13T10:43:11Z

This assumes that users may want to have multiple pipeline classes inheriting from Image pipeline. They want to have option to set settings per pipeline instances as in #1891 & #1850 but also per multiple pipeline classes (so having project wide settings key doesn't work for them).

It does not deprecate class attributes in favor of settings but uses class attributes as default values for settings. If there is nothing in user settings, pipeline will use uppercase attribute.

Aside from more flexibility this also gives full backward compatibility with whatever users were doing with uppercase attributes in their pipelines subclassing ImagePipeline.

Fixes: #1985, for alternative approach and more motivation see #1986

allow users to have class attributes on image pipelines. This assumes that class attributes are useful if users want to have different pipeline classes inhriting from ImagePipeline.

eliasdorneles · 2016-05-13T12:32:47Z

This is better, yeah.

One thing to note is that the setting is still global to all pipelines, so you can't set the setting IMAGES_RESULT_FIELD if you want these class atributes to be respected.

Perhaps it would be nice to have some tests making these design choices more explicit?

    def test_derived_class_can_customize_field(self):
        class MyCustomImagesPipeline(ImagesPipeline):
            IMAGES_RESULT_FIELD = "screenshot"
        pipeline = MyCustomImagesPipeline(
            self.tempdir, download_func=_mocked_download_func,
            settings={})
        self.assertEqual("screenshot", pipeline.images_result_field)

    def test_always_respect_global_setting(self):
        class MyCustomImagesPipeline(ImagesPipeline):
            IMAGES_RESULT_FIELD = "screenshot"
        pipeline = MyCustomImagesPipeline(
            self.tempdir, download_func=_mocked_download_func,
            settings={"IMAGES_RESULT_FIELD": "from_setting"})

        # XXX: is this really desirable?
        self.assertEqual("from_setting", pipeline.images_result_field)

pawelmhm · 2016-05-16T07:48:38Z

One thing to note is that the setting is still global to all pipelines, so you can't set the setting IMAGES_RESULT_FIELD if you want these class atributes to be respected.

good point, if someone sets something in settings this will override all class attributes. So it may be little confusing.

Do you think this would be argument for deprecating class attributes at some point and replacing them with setting keys? Perhaps in the future we could support image pipeline settings as dicts? E.g.

IMAGE_SETTINGS = {
    "MyFirstImagePipeline": {
           "IMAGE_RESULT_FIELD": "screenshots",
     },
    "MySecondIMagePipeline": {
           "IMAGE_RESULT_FIELD": "product_images",
    }
}

eliasdorneles · 2016-05-16T16:48:00Z

Not sure.
I think if I were implementing the custom pipelines, I'd introduce a new setting for each.

redapple · 2016-05-17T10:11:32Z

About this PR, I believe it's the best that can be done to handle both the ease-of-use of settings and also legacy customization using class attributes, even if it could be confusing that settings take precedence over class attributes (note/warning needed in docs at the very least).

Maybe we should promote the use of settings and show with code example how to customize the values at init.

About #1989 (comment) , I agree with @eliasdorneles on not using dicts settings for image pipelines.
I see settings as global knobs, effective for all subclasses, except if explicitly changed in the subclass contructor in some way (via a custom setting for example) by the developer.

pawelmhm · 2016-05-17T11:02:41Z

ok so I'll add tests for overriding class attributes with settings (as @eliasdorneles suggests) and also perhaps test for keeping uppercase attributes if there's pipeline inheriting from base image pipeline.

In docs I'll add following things:

warning that values from settings will override class attributes
code sample showing how to take values from settings in init

and docs about image pipeline settings.

codecov-io · 2016-05-18T10:05:56Z

Current coverage is 83.40%

Merging #1989 into master will increase coverage by 0.03%

Powered by Codecov. Last updated by 2dd1a9e...ceecf3b

pawelmhm · 2016-05-18T10:11:01Z

updated in 6c67db3

djunzu · 2016-05-19T19:03:22Z

So, this allows that we have different settings for different instances of the default ImagesPipeline OR multiple custom ImagesPipelines in a spider. Right?

I think we should do it be AND, not OR: it should be possible to have multiple custom ImagesPipelines per spider together with multiple settings across different spiders (running trough CrawlerProcess).

pawelmhm · 2016-05-20T06:54:56Z

I think we should do it be AND, not OR: it should be possible to have multiple custom ImagesPipelines per spider together with multiple settings across different spiders (running trough CrawlerProcess).

yeah I think this PR should do this. Multiple settings per pipeline class will be done by class attributes or custom init written by user (that will take values from settings). Multiple settings per different spiders will be possible by adding different custom_settings per spider class.

djunzu · 2016-05-20T20:16:17Z

yeah I think this PR should do this. Multiple settings per pipeline class will be done by class attributes or custom init written by user (that will take values from settings).

Yes, you are right. I forgot to consider custom init written by user.

I guess the problem is I think like a dumb end user.... There is nothing in the docs explaining how to write a custom init that will take values from settings. So, as a end user, I would expect something like this would just work:

pipelines.py:

class MyPipe(ImagesPipeline):
  def item_completed(self, results, item, info):
    item = super(MyPipe, self).item_completed(results, item, info)
    print("doing some stuff with item here")
    return item

class MyPipeTwo(ImagesPipeline):
  def item_completed(self, results, item, info):
    item = super(MyPipeTwo, self).item_completed(results, item, info)
    print("doing some different stuff with item here")
    return item

settings.py:

MYPIPE_EXPIRES = 10
MYPIPE_RESULT_FIELD = "my_field"
MYPIPETWO_EXPIRES = 20
MYPIPETWO_RESULT_FIELD = "another_field"

my_spider.py:

class MySpider1(CrawlSpider):
  ...
    item["my_field"] = links
    item["another_field"] = more_links
  ...

class MySpider2(CrawlSpider):
  custom_settings = {"MYPIPETWO_EXPIRES": 36500}
  ...
    item["my_field"] = links
    item["another_field"] = more_links
  ...

Ok, docs could explain how to write a custom init for custom ImagesPipelines. But, as a developer, I think it would expose a layer of complexity that the end user doesn't need to know about. Plus, if every custom ImagesPipeline must have something like:

 def __init__(self, store_uri, download_func=None, settings=None):
     self.files_urls_field = settings.get('CUSTOM_SETTING_NAME_FOR_URLS_FIELD', self.DEFAULT_FILES_URLS_FIELD)
     self.expires = settings.getint('CUSTOM_SETTING_NAME_FOR_EXPIRES', self.EXPIRES)

Then, it makes sense to me provide some out of the box feature in that settings for custom ImagesPipelines can be set easily in the settings.py.

Just my thoughts.

But I guess multiple ImagesPipeline in a single spider and multiple settings per different spiders are not the common case; both together should be very rare. So, no worries.

pawelmhm · 2016-05-30T14:51:26Z

@djunzu

docs could explain how to write a custom init for custom ImagesPipelines. But, as a developer, I think it would expose a layer of complexity that the end user doesn't need to know about.

I also think that adding this layer of complexity in docs may NOT be necessary. It will require long code sample that will be used by 1-2 % of users. So that would suggest current PR is good as it is (of course if there are no other objections). @redapple @eliasdorneles is it okay if we dont add code sample illustrating how to take settings on pipeline init?

@djunzu

Then, it makes sense to me provide some out of the box feature in that settings for custom ImagesPipelines can be set easily in the settings.py.

There is no obvious way to provide such feature. One way I was thinking about was using some form of dictionaries in settings see this comment here #1989 (comment), but others suggested that it would add complexity and break our established notions about settings keys. Plus if you have multiple image pipelines you have to create object instance anyway, so you can just as well add your own keys in settings or as class attributes whatever works best for you. It's actually not that complicated so I think most users should manage.

djunzu · 2016-05-31T20:56:30Z

@pawelmhm

It's actually not that complicated so I think most users should manage.

Here I must ask: how much most users know or should know about Scrapy?

Imagine you know absolutely nothing about Scrapy, you just started. How you would know it is possible to use a class attribute in the init? Two options: docs or dig into the code. We have agreed it should not go in the docs. Thinking as a end user of the framework, I do not want dig in the code.

Ok,, there is the Settings API. But... All we want is to set a custom value in a custom pipeline for a existing setting parameter. I think it should not be required to know about the Settings API for a simple task like that.

So that would suggest current PR is good as it is

I agree with you 100 percent!

There is no obvious way to provide such feature.

What about something like this?

urls_field = settings.get('IMAGES_URLS_FIELD', self.IMAGES_URLS_FIELD)
self.images_urls_field = settings.get('%s_URLS_FIELD' % self.__class__.__name__.upper(), urls_field)

result_field = settings.get('IMAGES_RESULT_FIELD', self.IMAGES_RESULT_FIELD)
self.images_result_field = settings.get('%s_RESULT_FIELD' % self.__class__.__name__.upper(), result_field)

It allows users to have:

# pipelines.py:
class ImagesPipelineOne(ImagesPipeline):
    pass
class ImagesPipelineTwo(ImagesPipeline):
    pass
class CustomImagesPipelineWithDefaultValues(ImagesPipeline):
    pass

# settings.py:
IMAGESPIPELINEONE_URLS_FIELD = 'image_urls_one'
IMAGESPIPELINEONE_RESULT_FIELD = 'images_one'
IMAGESPIPELINETWO_URLS_FIELD = 'image_urls_two'
IMAGESPIPELINETWO_RESULT_FIELD = 'images_two'

# spider.py:
class DummySpider(scrapy.Spider):
    name = "dummy"
    allowed_domains = ["example.com"]
    start_urls = ['http://www.example.com/']

    def parse(self, response):
        yield {'image_urls_one': ['http://scrapy.org/img/48-zimigo-logo.png'],
                  'image_urls_two': ['http://scrapy.org/img/shub-logo.png'],
                  'image_urls': ['http://scrapy.org/img/08-lyst-logo.png']}

# output:
# 2016-05-31 17:37:06 [dummy] DEBUG: Scraped from <200 http://www.example.com/>
{'image_urls': ['http://scrapy.org/img/08-lyst-logo.png'],
'image_urls_one': ['http://scrapy.org/img/48-zimigo-logo.png'],
'image_urls_two': ['http://scrapy.org/img/shub-logo.png'],
'images_two': [{'url': 'http://scrapy.org/img/shub-logo.png', 'path': '0d1de4a9ff01fd6c452460257ce36ee91120f9ab.jpg', 'checksum': '62eed3305ecc8e88e8b40f85e4f7b2c2'}],
'images_one': [{'url': 'http://scrapy.org/img/48-zimigo-logo.png', 'path': '7b67aa2be22751981093e2b28298e8fdf5716866.jpg', 'checksum': '80c1f6fb4a2807c55f57668946e3c645'}],
'images': [{'url': 'http://scrapy.org/img/08-lyst-logo.png', 'path': '06a6e5869eb2d9006f3e4b48422a1f9e26f954a9.jpg', 'checksum': 'f2ea5d62afaa040afc7fd8c6e2ed4610'}]}

pawelmhm · 2016-06-01T07:02:30Z

What about something like this?

nice idea! will try this out and add here.

allow to have image settings with class name, so that settings for user defined ImagePipeline subclasses can be defined easily.

pawelmhm · 2016-06-10T11:09:40Z

@redapple @eliasdorneles @djunzu updated a62d4b0

djunzu · 2016-06-10T14:14:46Z

docs/topics/media-pipeline.rst

+.. note:: If you have multiple image pipelines inheriting from ImagePipeline and you want to have different settings in different pipelines
+   you can set setting keys preceded with uppercase name of your pipeline class. E.g. if your pipeline is called
+   MyPipeline and you want to have custom IMAGES_URLS_FIELD you define setting MYPIPELINE_IMAGES_URLS_FIELD.
+



Maybe it would be valid to add something like "Otherwise the custom pipeline will inherit settings values from default pipeline."

I think this follows from context, but probably wont harm to add this.

djunzu · 2016-06-10T14:32:29Z

tests/test_pipeline_images.py

+
+        # If image settings are defined they override class attributes.
+        pipeline = UserDefinedImagePipeline.from_settings(Settings(settings))
+        self.assertEqual(pipeline.min_width, 1000)


The above comment doesn't make sense to me. There is a image setting defined and it is not overriding the class attribute.

good catch. Comment is outdated, it was relevant in previous version before this new update I pushed today. I'll remove it

djunzu · 2016-06-10T15:10:30Z

@pawelmhm

In default_settings.py, there are still three values for FilesPipeline that will override the respective class attributes.

I think FilesPipeline should also get its key_for_pipe and some tests.

And I think you can add one more test asserting a custom Files/ImagesPipeline inherit custom settings from parent. (So, if someone's code relies on this behavior, future updates will not break it.)

there was identical test for different setting keys. I unified it into one unit test. Fixes comments for tests, adds comments about intention of uppercase attrs. Adds another test for user defined setting keys and uppercase attrs.

unify tests that test same thing for different attribute values into one. Add better docstrings for tests.

test case when subclass inherits from base class and has no attributes nor settings defined.

if test tests same thing but for different field it can be unified into one.

dont override class attributes with default settings (same as in image pipeline).

…classes * move key_for_pipe function to media pipeline so that file pipeline can use it * use key_for_pipe in file pipeline so that users can define custom settings for subclasses easily * add tests for file pipelines attributes and settings

for subclasses.

djunzu · 2016-06-20T01:00:31Z

scrapy/pipelines/media.py

+        if class_name == base_class_name:
+            return key
+        return "{}_{}".format(class_name.upper(), key)
+
    @classmethod


I am not sure if _key_for_pipe() belongs to MediaPipeline. It is used only in Files and ImagesPipelines. Since ImagesPipeline inherits from FilesPipeline, maybe FilesPipeline would be a better place to put this function.
But placing it here allows it to be used in other classes inheriting from MediaPipeline...
Not sure about the best option.

But placing it here allows it to be used in other classes inheriting from MediaPipelin

yeah this is why I placed it there. I see no harm in keeping it in MediaPipeline, and there is potential benefit in the future so I think it's ok to keep it there.

some class attributes for ImagePipeline and FilesPipeline had DEFAULT prefix. These attributes should be preserved as well, if users subclasses define values for DEFAULT_<CLS_ATTRIBUTE_NAME> attribute this value should be preserved.

pawelmhm · 2016-06-29T21:05:59Z

so at this point it is probably ready. Are there any other comments or feedback I should include @redapple

redapple · 2016-07-08T10:57:13Z

@kmike , @eliasdorneles ,
are you ok with merging this? (and backporting to 1.1 of course)

kmike · 2016-07-09T00:54:39Z

docs/topics/media-pipeline.rst

+If you have multiple image pipelines inheriting from ImagePipeline and you want to have different settings in different pipelines
+you can set setting keys preceded with uppercase name of your pipeline class. E.g. if your pipeline is called
+MyPipeline and you want to have custom IMAGES_URLS_FIELD you define setting MYPIPELINE_IMAGES_URLS_FIELD and your custom
+settings will be used.


Could you please use 80 columns limit?

kmike · 2016-07-09T00:57:06Z

scrapy/pipelines/images.py

+        if not hasattr(self, "IMAGES_URLS_FIELD"):
+            self.IMAGES_URLS_FIELD = self.DEFAULT_IMAGES_URLS_FIELD
+
+        default_images_urls_field = getattr(self, "IMAGES_URLS_FIELD", "DEFAULT_IMAGES_URLS_FIELD")


default_images_urls_field will be "DEFAULT_IMAGES_URLS_FIELD", not "image_urls" if "IMAGES_URLS_FIELD" attribute is missing

good point. This would never happen because this attribute is set one line above. It was dead code. I removed that.

kmike · 2016-07-09T00:57:41Z

scrapy/pipelines/images.py

+        self.images_urls_field = settings.get(
+            self._key_for_pipe('IMAGES_URLS_FIELD', cls_name), default_images_urls_field
+        )
+        default_images_result_field = getattr(self, "IMAGES_RESULT_FIELD", "DEFAULT_IMAGES_RESULT_FIELD")


the same issue, "DEFAULT_IMAGES_RESULT_FIELD" shouldn't be a default value

kmike · 2016-07-09T01:00:53Z

scrapy/pipelines/images.py

+            self._key_for_pipe('IMAGES_MIN_HEIGHT', cls_name), self.MIN_HEIGHT
+        )
+        self.thumbs = settings.get(
+            self._key_for_pipe('IMAGES_THUMBS', cls_name), self.THUMBS


I'd cut some code and define

resolve = partial(self._key_for_pipe, base_class_name=cls_name)

and then

self.thumbs = settings.get(resolve('IMAGES_THUMBS'), self.THUMBS)

kmike · 2016-07-09T01:04:01Z

scrapy/pipelines/media.py

+
+    def _key_for_pipe(self, key, base_class_name):
+        """
+        Allow setting settings for user defined MediaPipelines that inherit from base.


This function doesn't allow anything by itself; I think this comment belongs either to docs or to the caller code. Also, the sentence is quite hard to read, the example below is much more clear :) Maybe it makes sense to just expand the example.

A doctest can be a good way to demonstrate what the function does.

* 80 characters line limit * shortening some code * removed dead code * add doctest for _key_for_pipe function

pawelmhm · 2016-07-12T12:00:50Z

@kmike updated in c22cc10

keeping line limit in docs
added functools partial
removed dead code
add doctest for key for pipe

kmike · 2016-07-12T12:05:20Z

scrapy/pipelines/media.py

+    def _key_for_pipe(self, key, base_class_name=None):
+        """
+        >>> result = MediaPipeline()._key_for_pipe("IMAGES")
+        >>> assert result == "IMAGES"


assert is usually not used in doctests; an easier way to write this:

>>> MediaPipeline()._key_for_pipe("IMAGES") 'IMAGES' ... >>> MyPipe()._key_for_pipe("IMAGES", base_class_name="MediaPipeline") 'MYPIPE_IMAGES'

good point, I need to write more doctests. fixed in 9818c97

redapple · 2016-07-12T15:46:46Z

LGTM!
Thanks again @pawelmhm

kmike · 2016-07-12T19:14:26Z

scrapy/pipelines/images.py

+        if not hasattr(self, "IMAGES_URLS_FIELD"):
+            self.IMAGES_URLS_FIELD = self.DEFAULT_IMAGES_URLS_FIELD
+
+        resolve = functools.partial(self._key_for_pipe, base_class_name=cls_name)


if you move resolve function upper you can use it for self.expires and drop cls_name variable

good point ceecf3b

[backport][1.1] [image_pipeline] bring back uppercase class attributes (PR #1989)

[image_pipeline] bring back uppercase pipeline attributes

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4cef1a1

allow users to have class attributes on image pipelines. This assumes that class attributes are useful if users want to have different pipeline classes inhriting from ImagePipeline.

pawelmhm mentioned this pull request May 13, 2016

Add fallback for upper case attribute names in Images Pipeline (fixes #1985) #1986

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pawelmhm changed the title ~~[image_pipeline] bring back uppercase pipeline attributes~~ [image_pipeline] bring back uppercase class attributes May 13, 2016

[image_pipeline] tests for class attrs backward compatibility

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and docs about image pipeline settings.

pawelmhm mentioned this pull request Jun 9, 2016

The setting ITEM_PIPELINE can't be overridden from terminal #2018

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[image-pipeline] image settings with class name

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allow to have image settings with class name, so that settings for user defined ImagePipeline subclasses can be defined easily.

djunzu reviewed Jun 10, 2016
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pawelmhm added 7 commits Jun 14, 2016

[image_pipeline] refactor and simplify tests for image settings

ee39d11

unify tests that test same thing for different attribute values into one. Add better docstrings for tests.

[image_pipeline] another test for subclass inheritance

72e4d5f

test case when subclass inherits from base class and has no attributes nor settings defined.

[files_pipeline] unify tests for files pipeline

c6d1686

if test tests same thing but for different field it can be unified into one.

[files_pipeline] ensure class attributes are preserved

acbfdc6

dont override class attributes with default settings (same as in image pipeline).

[files-pipeline] update docs with note about settings

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for subclasses.

djunzu reviewed Jun 20, 2016
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pawelmhm force-pushed the pawelmhm:fix-images-pipeline-uppercase-other branch from c5ca38c to fa4d0cd Jun 20, 2016

redapple changed the title ~~[image_pipeline] bring back uppercase class attributes~~ [MRG+1] [image_pipeline] bring back uppercase class attributes Jun 29, 2016

kmike added this to the v1.1.1 milestone Jul 8, 2016

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redapple mentioned this pull request Jul 11, 2016

Update release notes for upcoming 1.1.1 release #2113

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[image_pipeline] style edits

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* 80 characters line limit * shortening some code * removed dead code * add doctest for _key_for_pipe function

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[image_pipeline] dont use assert in doctest

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[image_pipeline] minor style tweaks

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pawelmhm force-pushed the pawelmhm:fix-images-pipeline-uppercase-other branch from dc0167c to ceecf3b Jul 13, 2016

kmike merged commit 79639d0 into scrapy:master Jul 13, 2016
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redapple added a commit that referenced this pull request Jul 13, 2016

Merge pull request #2122 from redapple/backport-1.1-1989

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[backport][1.1] [image_pipeline] bring back uppercase class attributes (PR #1989)

redapple mentioned this pull request Aug 1, 2016

[MRG+1] Fix IMAGES_EXPIRES default value #2140

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redapple mentioned this pull request Aug 26, 2016

Custom ImagesPipeline doesn't generate thumbnails #2198

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scrapy / scrapy

[MRG+1] [image_pipeline] bring back uppercase class attributes #1989

[MRG+1] [image_pipeline] bring back uppercase class attributes #1989

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[MRG+1] [image_pipeline] bring back uppercase class attributes #1989

[MRG+1] [image_pipeline] bring back uppercase class attributes #1989

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