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Fix pagination performance #237

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Fix pagination performance #237

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2 changes: 1 addition & 1 deletion src/qgis_stac/api/models.py
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Original file line number Diff line number Diff line change
Expand Up @@ -319,7 +319,7 @@ class Item:
class ItemSearch:
""" Definition for the pystac-client item search parameters"""
ids: typing.Optional[list] = None
page: typing.Optional[int] = 1
page: typing.Optional[int] = None
page_size: typing.Optional[int] = 10
collections: typing.Optional[list] = None
datetime: typing.Optional[QtCore.QDateTime] = None
Expand Down
32 changes: 14 additions & 18 deletions src/qgis_stac/api/network.py
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Original file line number Diff line number Diff line change
Expand Up @@ -268,25 +268,21 @@ def prepare_items_results(self, response):
:rtype: list
"""
self.pagination = ResourcePagination()
count = 1
items_generator = response.get_item_collections()
prev_collection = None
items_collection = None
page = self.search_params.page \
if self.search_params else Constants.PAGE_SIZE
while True:
try:
collection = next(items_generator)
prev_collection = collection
if page == count:
items_collection = collection
break
count += 1
except StopIteration:
self.pagination.total_pages = count
items_collection = prev_collection
break
items = self.get_items_list(items_collection)
if self.search_params else None

page_res = response.page(token=page)

if page_res.extra_fields:
for link in page_res.extra_fields.get('links', []):
if link['rel'] == 'next':
next_page = link.get('body', {}).get('token', None)
self.pagination.next_page = next_page
if link['rel'] == 'previous':
previous_page = link.get('body', {}).get('token', None)
self.pagination.previous_page = previous_page

items = self.get_items_list(page_res)
return items

def get_items_list(self, items_collection):
Expand Down
78 changes: 39 additions & 39 deletions src/qgis_stac/gui/qgis_stac_widget.py
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Original file line number Diff line number Diff line change
Expand Up @@ -163,7 +163,9 @@ def __init__(
self.search_error_message = None

# initialize page
self.page = 1
self.page = None
self.previous_page = None
self.next_page = None
self.total_pages = 0

self.current_collections = []
Expand Down Expand Up @@ -474,13 +476,12 @@ def search_items_api(self):
self.current_progress_message = tr(
"Searching items..."
)
self.page = 1
self.search_items()

def previous_items(self):
""" Sets the items search to go on the previous page.
"""
self.page -= 1
self.page = self.previous_page
self.current_progress_message = tr(
"Retrieving previous page..."
)
Expand All @@ -489,7 +490,7 @@ def previous_items(self):
def next_items(self):
""" Sets the items search to go on the next page.
"""
self.page += 1
self.page = self.next_page
self.current_progress_message = tr(
"Retrieving next page..."
)
Expand Down Expand Up @@ -720,49 +721,48 @@ def display_results(self, results, pagination=None):

elif self.search_type == ResourceType.FEATURE:

if pagination and pagination.total_pages > 0:
if pagination:
self.previous_page = pagination.previous_page
self.next_page = pagination.next_page

if len(results) > 0:
self.result_items_la.setText(
tr(
"Displaying page {} of results, {} item(s)"
).format(
self.page,
len(results)
)
)
self.item_model = ItemsModel(results)
self.items_proxy_model.setSourceModel(self.item_model)
settings_manager.delete_all_items(
settings_manager.get_current_connection(),
self.page
)
self.populate_results(results)
else:

self.clear_search_results()
if self.page > 1:
self.page -= 1
self.next_btn.setEnabled(False)
else:
if len(results) > 0:
if self.date_filter_group.isChecked() \
or self.extent_box.isChecked():
self.result_items_la.setText(
tr(
"Displaying page {} of results, {} item(s)"
).format(
self.page,
len(results)
"No items were found, "
"try to expand the date filter or "
"the spatial extent filter used."
)
)
self.item_model = ItemsModel(results)
self.items_proxy_model.setSourceModel(self.item_model)
settings_manager.delete_all_items(
settings_manager.get_current_connection(),
self.page
)
self.populate_results(results)
else:

self.clear_search_results()
if self.page > 1:
self.page -= 1
if self.date_filter_group.isChecked() \
or self.extent_box.isChecked():
self.result_items_la.setText(
tr(
"No items were found, "
"try to expand the date filter or "
"the spatial extent filter used."
)
)
else:
self.result_items_la.setText(
tr(
"No items were found"
)
self.result_items_la.setText(
tr(
"No items were found"
)
self.next_btn.setEnabled(len(results) > 0)
self.prev_btn.setEnabled(self.page > 1)
)
self.next_btn.setEnabled(self.next_page is not None)
self.prev_btn.setEnabled(self.previous_page is not None)
self.footprint_btn.setEnabled(
False
)
Expand Down
14 changes: 14 additions & 0 deletions src/qgis_stac/lib/pystac_client/item_search.py
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Original file line number Diff line number Diff line change
Expand Up @@ -435,6 +435,20 @@ def get_item_collections(self) -> Iterator[ItemCollection]:
for page in self._stac_io.get_pages(self.url, self.method, self.get_parameters()):
yield ItemCollection.from_dict(page, preserve_dict=False, root=self.client)

def page(self, page=None, token=None) -> Dict:
if isinstance(self._stac_io, StacApiIO):
page = self._stac_io.get_page(
self.url,
self.method,
self.get_parameters(),
page=page,
token=token,
)
page_collection = ItemCollection.from_dict(
page, preserve_dict=False, root=self.client
) if page is not None else None
return page_collection

def get_items(self) -> Iterator[Item]:
"""Iterator that yields :class:`pystac.Item` instances for each item matching the given search parameters. Calls
:meth:`ItemSearch.item_collections()` internally and yields from
Expand Down
41 changes: 41 additions & 0 deletions src/qgis_stac/lib/pystac_client/stac_api_io.py
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Original file line number Diff line number Diff line change
Expand Up @@ -219,6 +219,47 @@ def get_pages(self, url, method='GET', parameters={}) -> Iterator[Dict]:
next_link = next((link for link in page.get('links', []) if link['rel'] == 'next'),
None)

def get_page(
self,
url: str,
method: Optional[str] = None,
parameters: Optional[Dict[str, Any]] = None,
page: Optional = None,
token: Optional = None
):
"""Get page using the passed page number or the token

Return:
Dict[str, Any] : JSON content from a single page
"""
if page is None and token is None:
# Always return the first page if page is not passed
parameters['page'] = 1
page = self.read_json(
url,
method=method,
parameters=parameters
)
if page is not None:
parameters['page'] = page
page = self.read_json(
url,
method=method,
parameters=parameters
)
elif token is not None:
parameters['token'] = token
page = self.read_json(
url,
method=method,
parameters=parameters
)
else:
page = None
return page

return page

def assert_conforms_to(self, conformance_class: ConformanceClasses) -> None:
"""Raises a :exc:`NotImplementedError` if the API does not publish the given conformance class. This method
only checks against the ``"conformsTo"`` property from the API landing page and does not make any additional
Expand Down