prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Using the _since querystring filter has no effect
  I've tried using the `_since` querystring filter as explained in the tutorial, but it seems to have no effect.
  
  `GET`ing any of those urls returns the exact same list (the full list of records)
  
  ```
  http GET http://0.0.0.0:8888/v1/buckets/default/collections/tasks/records?_since=1436094288171 -v  --auth 'user:password'
  http GET http://0.0.0.0:8888/v1/buckets/default/collections/tasks/records?_since=foobar -v  --auth 'user:password'
  http GET http://0.0.0.0:8888/v1/buckets/default/collections/tasks/records?_since=`date +%s` -v  --auth 'user:password'
  ```
  
  The last one uses the current timestamp as the value, which means it should return an empty list.
  
  
  </issue>
  <code>
  [start of kinto/views/buckets.py]
  1 from pyramid.httpexceptions import HTTPForbidden, HTTPPreconditionFailed
  2 from pyramid.security import NO_PERMISSION_REQUIRED
  3 from pyramid.view import view_config
  4 
  5 from cliquet import resource
  6 from cliquet.utils import hmac_digest, build_request
  7 
  8 from kinto.views import NameGenerator
  9 
  10 
  11 def create_bucket(request, bucket_id):
  12     """Create a bucket if it doesn't exists."""
  13     bucket_put = (request.method.lower() == 'put' and
  14                   request.path.endswith('buckets/default'))
  15 
  16     if not bucket_put:
  17         subrequest = build_request(request, {
  18             'method': 'PUT',
  19             'path': '/buckets/%s' % bucket_id,
  20             'body': {"data": {}},
  21             'headers': {'If-None-Match': '*'.encode('utf-8')}
  22         })
  23 
  24         try:
  25             request.invoke_subrequest(subrequest)
  26         except HTTPPreconditionFailed:
  27             # The bucket already exists
  28             pass
  29 
  30 
  31 def create_collection(request, bucket_id):
  32     subpath = request.matchdict['subpath']
  33     if subpath.startswith('/collections/'):
  34         collection_id = subpath.split('/')[2]
  35         collection_put = (request.method.lower() == 'put' and
  36                           request.path.endswith(collection_id))
  37         if not collection_put:
  38             subrequest = build_request(request, {
  39                 'method': 'PUT',
  40                 'path': '/buckets/%s/collections/%s' % (
  41                     bucket_id, collection_id),
  42                 'body': {"data": {}},
  43                 'headers': {'If-None-Match': '*'.encode('utf-8')}
  44             })
  45             try:
  46                 request.invoke_subrequest(subrequest)
  47             except HTTPPreconditionFailed:
  48                 # The collection already exists
  49                 pass
  50 
  51 
  52 @view_config(route_name='default_bucket', permission=NO_PERMISSION_REQUIRED)
  53 def default_bucket(request):
  54     if getattr(request, 'prefixed_userid', None) is None:
  55         raise HTTPForbidden  # Pass through the forbidden_view_config
  56 
  57     settings = request.registry.settings
  58     hmac_secret = settings['cliquet.userid_hmac_secret']
  59     # Build the user unguessable bucket_id UUID from its user_id
  60     bucket_id = hmac_digest(hmac_secret, request.prefixed_userid)[:32]
  61     path = request.path.replace('default', bucket_id)
  62 
  63     # Make sure bucket exists
  64     create_bucket(request, bucket_id)
  65 
  66     # Make sure the collection exists
  67     create_collection(request, bucket_id)
  68 
  69     subrequest = build_request(request, {
  70         'method': request.method,
  71         'path': path,
  72         'body': request.body
  73     })
  74 
  75     return request.invoke_subrequest(subrequest)
  76 
  77 
  78 @resource.register(name='bucket',
  79                    collection_methods=('GET',),
  80                    collection_path='/buckets',
  81                    record_path='/buckets/{{id}}')
  82 class Bucket(resource.ProtectedResource):
  83     permissions = ('read', 'write', 'collection:create', 'group:create')
  84 
  85     def __init__(self, *args, **kwargs):
  86         super(Bucket, self).__init__(*args, **kwargs)
  87         self.collection.id_generator = NameGenerator()
  88 
  89     def get_parent_id(self, request):
  90         # Buckets are not isolated by user, unlike Cliquet resources.
  91         return ''
  92 
  93     def delete(self):
  94         result = super(Bucket, self).delete()
  95 
  96         # Delete groups.
  97         storage = self.collection.storage
  98         parent_id = '/buckets/%s' % self.record_id
  99         storage.delete_all(collection_id='group', parent_id=parent_id)
  100 
  101         # Delete collections.
  102         deleted = storage.delete_all(collection_id='collection',
  103                                      parent_id=parent_id)
  104 
  105         # Delete records.
  106         id_field = self.collection.id_field
  107         for collection in deleted:
  108             parent_id = '/buckets/%s/collections/%s' % (self.record_id,
  109                                                         collection[id_field])
  110             storage.delete_all(collection_id='record', parent_id=parent_id)
  111 
  112         return result
  113
  [end of kinto/views/buckets.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/kinto/views/buckets.py b/kinto/views/buckets.py
  --- a/kinto/views/buckets.py
  +++ b/kinto/views/buckets.py
  @@ -59,6 +59,8 @@
       # Build the user unguessable bucket_id UUID from its user_id
       bucket_id = hmac_digest(hmac_secret, request.prefixed_userid)[:32]
       path = request.path.replace('default', bucket_id)
  +    querystring = request.url[(request.url.index(request.path) +
  +                               len(request.path)):]
   
       # Make sure bucket exists
       create_bucket(request, bucket_id)
  @@ -68,7 +70,7 @@
   
       subrequest = build_request(request, {
           'method': request.method,
  -        'path': path,
  +        'path': path + querystring,
           'body': request.body
       })
  
verification_info: {"golden_diff": "diff --git a/kinto/views/buckets.py b/kinto/views/buckets.py\n--- a/kinto/views/buckets.py\n+++ b/kinto/views/buckets.py\n@@ -59,6 +59,8 @@\n     # Build the user unguessable bucket_id UUID from its user_id\n     bucket_id = hmac_digest(hmac_secret, request.prefixed_userid)[:32]\n     path = request.path.replace('default', bucket_id)\n+    querystring = request.url[(request.url.index(request.path) +\n+                               len(request.path)):]\n \n     # Make sure bucket exists\n     create_bucket(request, bucket_id)\n@@ -68,7 +70,7 @@\n \n     subrequest = build_request(request, {\n         'method': request.method,\n-        'path': path,\n+        'path': path + querystring,\n         'body': request.body\n     })\n", "issue": "Using the _since querystring filter has no effect\nI've tried using the `_since` querystring filter as explained in the tutorial, but it seems to have no effect.\n\n`GET`ing any of those urls returns the exact same list (the full list of records)\n\n```\nhttp GET http://0.0.0.0:8888/v1/buckets/default/collections/tasks/records?_since=1436094288171 -v  --auth 'user:password'\nhttp GET http://0.0.0.0:8888/v1/buckets/default/collections/tasks/records?_since=foobar -v  --auth 'user:password'\nhttp GET http://0.0.0.0:8888/v1/buckets/default/collections/tasks/records?_since=`date +%s` -v  --auth 'user:password'\n```\n\nThe last one uses the current timestamp as the value, which means it should return an empty list.\n\n", "before_files": [{"content": "from pyramid.httpexceptions import HTTPForbidden, HTTPPreconditionFailed\nfrom pyramid.security import NO_PERMISSION_REQUIRED\nfrom pyramid.view import view_config\n\nfrom cliquet import resource\nfrom cliquet.utils import hmac_digest, build_request\n\nfrom kinto.views import NameGenerator\n\n\ndef create_bucket(request, bucket_id):\n    \"\"\"Create a bucket if it doesn't exists.\"\"\"\n    bucket_put = (request.method.lower() == 'put' and\n                  request.path.endswith('buckets/default'))\n\n    if not bucket_put:\n        subrequest = build_request(request, {\n            'method': 'PUT',\n            'path': '/buckets/%s' % bucket_id,\n            'body': {\"data\": {}},\n            'headers': {'If-None-Match': '*'.encode('utf-8')}\n        })\n\n        try:\n            request.invoke_subrequest(subrequest)\n        except HTTPPreconditionFailed:\n            # The bucket already exists\n            pass\n\n\ndef create_collection(request, bucket_id):\n    subpath = request.matchdict['subpath']\n    if subpath.startswith('/collections/'):\n        collection_id = subpath.split('/')[2]\n        collection_put = (request.method.lower() == 'put' and\n                          request.path.endswith(collection_id))\n        if not collection_put:\n            subrequest = build_request(request, {\n                'method': 'PUT',\n                'path': '/buckets/%s/collections/%s' % (\n                    bucket_id, collection_id),\n                'body': {\"data\": {}},\n                'headers': {'If-None-Match': '*'.encode('utf-8')}\n            })\n            try:\n                request.invoke_subrequest(subrequest)\n            except HTTPPreconditionFailed:\n                # The collection already exists\n                pass\n\n\n@view_config(route_name='default_bucket', permission=NO_PERMISSION_REQUIRED)\ndef default_bucket(request):\n    if getattr(request, 'prefixed_userid', None) is None:\n        raise HTTPForbidden  # Pass through the forbidden_view_config\n\n    settings = request.registry.settings\n    hmac_secret = settings['cliquet.userid_hmac_secret']\n    # Build the user unguessable bucket_id UUID from its user_id\n    bucket_id = hmac_digest(hmac_secret, request.prefixed_userid)[:32]\n    path = request.path.replace('default', bucket_id)\n\n    # Make sure bucket exists\n    create_bucket(request, bucket_id)\n\n    # Make sure the collection exists\n    create_collection(request, bucket_id)\n\n    subrequest = build_request(request, {\n        'method': request.method,\n        'path': path,\n        'body': request.body\n    })\n\n    return request.invoke_subrequest(subrequest)\n\n\n@resource.register(name='bucket',\n                   collection_methods=('GET',),\n                   collection_path='/buckets',\n                   record_path='/buckets/{{id}}')\nclass Bucket(resource.ProtectedResource):\n    permissions = ('read', 'write', 'collection:create', 'group:create')\n\n    def __init__(self, *args, **kwargs):\n        super(Bucket, self).__init__(*args, **kwargs)\n        self.collection.id_generator = NameGenerator()\n\n    def get_parent_id(self, request):\n        # Buckets are not isolated by user, unlike Cliquet resources.\n        return ''\n\n    def delete(self):\n        result = super(Bucket, self).delete()\n\n        # Delete groups.\n        storage = self.collection.storage\n        parent_id = '/buckets/%s' % self.record_id\n        storage.delete_all(collection_id='group', parent_id=parent_id)\n\n        # Delete collections.\n        deleted = storage.delete_all(collection_id='collection',\n                                     parent_id=parent_id)\n\n        # Delete records.\n        id_field = self.collection.id_field\n        for collection in deleted:\n            parent_id = '/buckets/%s/collections/%s' % (self.record_id,\n                                                        collection[id_field])\n            storage.delete_all(collection_id='record', parent_id=parent_id)\n\n        return result\n", "path": "kinto/views/buckets.py"}]}