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Add demo web app and test with actual data

This commit is contained in:
Val Lorentz 2023-05-28 21:09:59 +02:00
parent f076efffc6
commit a996e1b4a6
11 changed files with 430 additions and 16 deletions
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3
.gitignore vendored
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@ -160,3 +160,6 @@ cython_debug/
# option (not recommended) you can uncomment the following to ignore the entire idea folder.
#.idea/
# Date
*.sqlite3

0
glowtables/examples/__init__.py Normal file
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58
glowtables/examples/cats.py Normal file
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@ -0,0 +1,58 @@
# This file is part of the Glowtables software
# Copyright (C) 2023 Valentin Lorentz
#
# This program is free software: you can redistribute it and/or modify it under the
# terms of the GNU Affero General Public License version 3, as published by the
# Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License along with
# this program. If not, see <http://www.gnu.org/licenses/>.
"""Example table of all Wikidata cats"""
import rdflib
from glowtables.table import LabeledField, Language, Table
cats = Table(
id="cats",
display_names={Language("en"): "Cats"},
fields=[
LabeledField(
"name",
{Language("en"): "Name property (not label)"},
str,
rdflib.URIRef("http://www.wikidata.org/prop/direct/P2561"),
default="",
),
LabeledField(
"breed",
{Language("en"): "Breed"},
str,
rdflib.URIRef("http://www.wikidata.org/prop/direct/P4743"),
),
LabeledField(
"instanceof",
{Language("en"): "Instance of"},
str,
rdflib.URIRef("http://www.wikidata.org/prop/direct/P31"),
),
LabeledField(
"haircolor",
{Language("en"): "Hair color"},
str,
rdflib.URIRef("http://www.wikidata.org/prop/direct/P1884"),
default="",
),
],
constraints="""
?subject
<http://www.wikidata.org/prop/direct/P31>
<http://www.wikidata.org/entity/Q146>
.
""", # instance of cat
)

128
glowtables/shortxml.py Normal file
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@ -0,0 +1,128 @@
# Copyright (c) 2023 Valentin Lorentz
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
# pylint: disable=consider-using-f-string,missing-class-docstring
"""This module allows writing XML ASTs in a way that is more concise than the default
:mod:`xml.etree.ElementTree` interface.
For example:
.. code-block:: python
from .shortxml import Namespace
HTML = Namespace("http://www.w3.org/1999/xhtml")
page = HTML.html(
HTML.head(
HTML.title("irctest dashboard"),
HTML.link(rel="stylesheet", type="text/css", href="./style.css"),
),
HTML.body(
HTML.h1("irctest dashboard"),
HTML.h2("Tests by command/specification"),
HTML.dl(
[
( # elements can be arbitrarily nested in lists
HTML.dt(HTML.a(title, href=f"./{title}.xhtml")),
HTML.dd(defintion),
)
for title, definition in sorted(definitions)
],
class_="module-index",
),
HTML.h2("Tests by implementation"),
HTML.ul(
[
HTML.li(HTML.a(job, href=f"./{file_name}"))
for job, file_name in sorted(job_pages)
],
class_="job-index",
),
),
)
print(ET.tostring(page, default_namespace=HTML.uri))
Attributes can be passed either as dictionaries or as kwargs, and can be mixed
with child elements.
Trailing underscores are stripped from attributes, which allows passing reserved
Python keywords (eg. ``class_`` instead of ``class``)
Attributes are always qualified, and share the namespace of the element they are
attached to.
Mixed content (elements containing both text and child elements) is not supported.
"""
import xml.etree.ElementTree as ET
from typing import Dict, Iterable, Union
def _namespacify(ns: str, s: str) -> str:
return "{%s}%s" % (ns, s)
_Children = Union[None, Dict[str, str], ET.Element, Iterable["_Children"]]
class ElementFactory:
def __init__(self, namespace: str, tag: str):
self._tag = _namespacify(namespace, tag)
self._namespace = namespace
def __call__(self, *args: Union[str, _Children], **kwargs: str) -> ET.Element:
e = ET.Element(self._tag)
attributes = {k.rstrip("_"): v for (k, v) in kwargs.items()}
children = [*args, attributes]
if args and isinstance(children[0], str):
e.text = children[0]
children.pop(0)
for child in children:
self._append_child(e, child)
return e
def _append_child(self, e: ET.Element, child: _Children) -> None:
if isinstance(child, ET.Element):
e.append(child)
elif child is None:
pass
elif isinstance(child, dict):
for k, v in child.items():
e.set(_namespacify(self._namespace, k), str(v))
elif isinstance(child, str):
raise ValueError("Mixed content is not supported")
else:
for grandchild in child:
self._append_child(e, grandchild)
class Namespace:
def __init__(self, uri: str):
self.uri = uri
def __getattr__(self, tag: str) -> ElementFactory:
return ElementFactory(self.uri, tag)

6
glowtables/sparql.py
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@ -16,7 +16,6 @@
import abc
import json
import urllib.parse
from typing import Iterable
import requests
@ -50,13 +49,10 @@ class RemoteSparqlBackend(SparqlBackend):
"Content-Type": "application/sparql-query",
"Accept": "application/json",
}
params = {"query": query}
resp_text = self._cache.get(self._url, query)
if not resp_text:
resp_text = self._session.post(
self._url, headers=headers, data=urllib.parse.urlencode(params)
).text
resp_text = self._session.post(self._url, headers=headers, data=query).text
self._cache.set(self._url, query, resp_text)
resp = json.loads(resp_text)

9
glowtables/style.css Normal file
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@ -0,0 +1,9 @@
@media (prefers-color-scheme: dark) {
body {
background-color: #121212;
color: rgba(255, 255, 255, 0.87);
}
a {
filter: invert(0.85) hue-rotate(180deg);
}
}

46
glowtables/table.py
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@ -111,6 +111,48 @@ class LiteralField(Field[_TFieldValue], Generic[_TFieldValue]):
return f"OPTIONAL {{ {statement} }}."
@dataclasses.dataclass
class LabeledField(Field[_TFieldValue], Generic[_TFieldValue]):
"""Simplest field: its value is a literal directly on the subject"""
predicate: rdflib.URIRef
default: Optional[_TFieldValue] = None
"""If this is not :const:`None`, allows subjects without a statement for this field;
and use this value instead when sorting.
This is only used when sorting, and isn't displayed."""
def sort_key(self, value: Optional[_TFieldValue]) -> Any:
"""Function suitable as ``key`` argument to :func:`sorted`.
Defaults to the identity function."""
if value is None:
if self.default is None:
raise ValueError(f"{self.id} value is unexpectedly None")
return self.sort_key(self.default)
return value
def sparql(
self,
subject_var: SparqlVariable,
object_var: SparqlVariable,
new_var: Callable[[], SparqlVariable],
) -> str:
node_var = new_var()
statement = f"""
?{subject_var} <{self.predicate}> ?{node_var}.
SERVICE <http://wikiba.se/ontology#label> {{
<http://www.bigdata.com/rdf#serviceParam> <http://wikiba.se/ontology#language> "en".
?{node_var} <http://www.w3.org/2000/01/rdf-schema#label> ?{object_var}.
}}
""" # noqa
if self.default is None:
return statement
else:
return f"OPTIONAL {{ {statement} }}."
@dataclasses.dataclass
class Table:
"""A table, along with its fields description."""
@ -127,7 +169,7 @@ class Table:
(by default, ``?subject``).
"""
id: Optional[str] = None
id: str
"""Unique within a Glowtable instance"""
display_names: dict[Language, str] = dataclasses.field(default_factory=dict)
@ -188,6 +230,6 @@ class Table:
"""
for row in backend.query(self.sparql()):
yield tuple(
None if cell is None else field.parse(cell)
None if cell is None else field.parse(cell["value"])
for (field, cell) in zip(self.fields, row)
)

23
glowtables/tests/conftest.py
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@ -16,8 +16,6 @@
# pylint: disable=redefined-outer-name
import urllib.parse
import pytest
import rdflib
@ -35,15 +33,28 @@ def rdflib_graph() -> rdflib.Graph:
def rdflib_sparql(requests_mock, rdflib_graph: rdflib.Graph) -> RemoteSparqlBackend:
"""Returns a SPARQL backend instance for ``rdflib_graph``."""
def rdflib_to_json(o) -> dict:
if isinstance(o, rdflib.Literal):
return {"type": "literal", "value": str(o)}
elif isinstance(o, rdflib.URIRef):
return {"type": "uri", "value": str(o)}
else:
raise NotImplementedError(o)
def json_callback(request, context):
params = urllib.parse.parse_qs(request.text)
(query,) = params["query"]
results = rdflib_graph.query(query)
results = rdflib_graph.query(request.text)
context.status_code = 200
return {
"head": {"vars": results.vars},
"results": {
"bindings": [dict(zip(results.vars, result)) for result in results]
"bindings": [
{
k: rdflib_to_json(v)
for (k, v) in zip(results.vars, result)
if v is not None
}
for result in results
]
},
}

5
glowtables/tests/table_test.py
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@ -69,6 +69,7 @@ def test_single_literal(rdflib_sparql: SparqlBackend) -> None:
rdflib.URIRef("http://example.org/display-name"),
)
table = Table(
id="test-table",
fields=[name_field],
constraints="?subject <http://example.org/type> <http://example.org/CPU>.",
)
@ -103,6 +104,7 @@ def test_two_literals(rdflib_sparql: SparqlBackend) -> None:
rdflib.URIRef("http://example.org/clock-frequency"),
)
table = Table(
id="test-table",
fields=[name_field, frequency_field],
constraints="?subject <http://example.org/type> <http://example.org/CPU>.",
)
@ -139,6 +141,7 @@ def test_default_value(rdflib_sparql: SparqlBackend) -> None:
default=Decimal(0),
)
table = Table(
id="test-table",
fields=[name_field, frequency_field],
constraints="?subject <http://example.org/type> <http://example.org/CPU>.",
)
@ -170,6 +173,7 @@ def test_field_id_subject() -> None:
)
with pytest.raises(ValueError, match="both subject and a field id"):
Table(
id="test-table",
fields=[name_field],
constraints="",
)
@ -190,6 +194,7 @@ def test_field_id_clash() -> None:
)
with pytest.raises(ValueError, match="has duplicate field ids: name"):
Table(
id="test-table",
fields=[name_field, display_name_field],
constraints="",
)

158
glowtables/views.py Normal file
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@ -0,0 +1,158 @@
# This file is part of the Glowtables software
# Copyright (C) 2023 Valentin Lorentz
#
# This program is free software: you can redistribute it and/or modify it under the
# terms of the GNU Affero General Public License version 3, as published by the
# Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License along with
# this program. If not, see <http://www.gnu.org/licenses/>.
"""Minimal webapp to display Glowtables"""
import functools
import importlib.metadata
import importlib.resources
import logging
import operator
import xml.etree.ElementTree as ET
from typing import Callable, List, TypeVar
import flask
from .cache import Cache
from .shortxml import Namespace
from .sparql import RemoteSparqlBackend
from .table import Language, Table
HTML = Namespace("http://www.w3.org/1999/xhtml")
LANG = Language("en") # TODO: configurable
logger = logging.getLogger(__name__)
app = flask.Flask(__name__)
TView = TypeVar("TView", bound=Callable)
def _sparql_backend() -> RemoteSparqlBackend:
return RemoteSparqlBackend(
"https://query.wikidata.org/sparql",
agent="Unconfigured Glowtable instance",
cache=Cache("file:sparql_cache.sqlite3"),
)
def xhtml_view(f: TView) -> TView:
"""Decorator for Flask views which may return XHTML as :mod:`xml.etree.ElementTree`
objects."""
@functools.wraps(f)
def newf(*args, **kwargs):
res = f(*args, **kwargs)
if isinstance(res, (ET.Element, ET.ElementTree)):
xml = ET.tostring(res, default_namespace=HTML.uri)
return flask.Response(xml, mimetype="application/xhtml+xml")
else:
return res
return newf # type: ignore[return-value]
def list_tables() -> List[Table]:
"""Returns all :class:`Table` instances registered as ``glowtables.tables``
entrypoints."""
table_entrypoints: List[
importlib.metadata.EntryPoint
] = importlib.metadata.entry_points( # type: ignore[call-arg,assignment]
group="glowtables.tables"
)
tables = []
for table_entrypoint in sorted(table_entrypoints, key=operator.attrgetter("name")):
table = table_entrypoint.load()
if not isinstance(table, Table):
logger.error(
"%s is %r, which is not an instance of glowtables.table.Table",
table_entrypoint.name,
table,
)
continue
tables.append(table)
return tables
@app.route("/")
@xhtml_view
def index() -> ET.Element:
"""Displays the list of tables."""
tables = list_tables()
return HTML.html(
HTML.head(
HTML.title("Glowtables"),
HTML.link(rel="stylesheet", type="text/css", href="/style.css"),
),
HTML.body(
HTML.h1("Glowtables"),
HTML.ul(
[
HTML.li(
HTML.a(table.display_names[LANG], href=f"/tables/{table.id}/")
)
for table in tables
]
)
if tables
else HTML.p(
"""
There are no tables defined, check the Glowtables documentation
to find how to configure them.
"""
),
),
)
@app.route("/style.css")
def style() -> flask.Response:
"""Serves the CSS."""
css = importlib.resources.files(__package__).joinpath("style.css").read_bytes()
return flask.Response(css, mimetype="text/css")
@app.route("/tables/<table_id>/")
@xhtml_view
def table_(table_id: str) -> ET.Element:
"""Displays a table."""
tables = list_tables()
for table in tables:
if table.id == table_id:
break
else:
flask.abort(404)
return HTML.html(
HTML.head(
HTML.title("Glowtables"),
HTML.link(rel="stylesheet", type="text/css", href="/style.css"),
),
HTML.body(
HTML.h1(table.display_names[LANG]),
HTML.table(
HTML.thead(
HTML.tr(
HTML.th(field.display_names[LANG]) for field in table.fields
)
),
HTML.tbody(
HTML.tr(HTML.td(cell) for cell in row)
for row in table.query(_sparql_backend())
),
),
),
)

10
pyproject.toml
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@ -7,9 +7,9 @@ name = "glowtables"
version = "0.0.1"
requires-python = ">=3.9"
dependencies = [
"flask ~= 2.0.0",
"rdflib ~= 6.0.0",
"requests ~= 3.0.0",
"flask ~= 2.0",
"rdflib ~= 6.0",
"requests ~= 2.0",
]
[project.optional-dependencies]
@ -21,6 +21,9 @@ testing = [
"types-setuptools",
]
[project.entry-points."glowtables.tables"]
example_cats = "glowtables.examples.cats:cats"
[tool.isort]
profile = "black"
@ -51,6 +54,7 @@ disable = [
"no-member",
"unsupported-membership-test",
"import-error",
"undefined-loop-variable",
# flake8 does it already:
"line-too-long",
]