test_cache.py

# -*- coding: utf-8 -*-
import os
from uuid import UUID

import pytest
from peewee import OperationalError

from arkindex_worker.cache import (
    CachedElement,
    CachedImage,
    create_tables,
    db,
    init_cache_db,
)


def test_init_non_existent_path():
    with pytest.raises(OperationalError) as e:
        init_cache_db("path/not/found.sqlite")

    assert str(e.value) == "unable to open database file"


def test_init(tmp_path):
    db_path = f"{tmp_path}/db.sqlite"
    init_cache_db(db_path)

    assert os.path.isfile(db_path)


def test_create_tables_existing_table(tmp_path):
    db_path = f"{tmp_path}/db.sqlite"

    # Create the tables once…
    init_cache_db(db_path)
    create_tables()
    db.close()

    with open(db_path, "rb") as before_file:
        before = before_file.read()

    # Create them again
    init_cache_db(db_path)
    create_tables()

    with open(db_path, "rb") as after_file:
        after = after_file.read()

    assert before == after, "Existing table structure was modified"


def test_create_tables(tmp_path):
    db_path = f"{tmp_path}/db.sqlite"
    init_cache_db(db_path)
    create_tables()

    expected_schema = """CREATE TABLE "classifications" ("id" TEXT NOT NULL PRIMARY KEY, "element_id" TEXT NOT NULL, "class_name" TEXT NOT NULL, "confidence" REAL NOT NULL, "state" VARCHAR(10) NOT NULL, "worker_version_id" TEXT NOT NULL, FOREIGN KEY ("element_id") REFERENCES "elements" ("id"))
CREATE TABLE "elements" ("id" TEXT NOT NULL PRIMARY KEY, "parent_id" TEXT, "type" VARCHAR(50) NOT NULL, "image_id" TEXT, "polygon" text, "initial" INTEGER NOT NULL, "worker_version_id" TEXT, FOREIGN KEY ("image_id") REFERENCES "images" ("id"))
CREATE TABLE "entities" ("id" TEXT NOT NULL PRIMARY KEY, "type" VARCHAR(50) NOT NULL, "name" TEXT NOT NULL, "validated" INTEGER NOT NULL, "metas" text, "worker_version_id" TEXT NOT NULL)
CREATE TABLE "images" ("id" TEXT NOT NULL PRIMARY KEY, "width" INTEGER NOT NULL, "height" INTEGER NOT NULL, "url" TEXT NOT NULL)
CREATE TABLE "transcription_entities" ("transcription_id" TEXT NOT NULL, "entity_id" TEXT NOT NULL, "offset" INTEGER NOT NULL CHECK (offset >= 0), "length" INTEGER NOT NULL CHECK (length > 0), PRIMARY KEY ("transcription_id", "entity_id"), FOREIGN KEY ("transcription_id") REFERENCES "transcriptions" ("id"), FOREIGN KEY ("entity_id") REFERENCES "entities" ("id"))
CREATE TABLE "transcriptions" ("id" TEXT NOT NULL PRIMARY KEY, "element_id" TEXT NOT NULL, "text" TEXT NOT NULL, "confidence" REAL NOT NULL, "worker_version_id" TEXT NOT NULL, FOREIGN KEY ("element_id") REFERENCES "elements" ("id"))"""

    actual_schema = "\n".join(
        [
            row[0]
            for row in db.connection()
            .execute("SELECT sql FROM sqlite_master WHERE type = 'table' ORDER BY name")
            .fetchall()
        ]
    )

    assert expected_schema == actual_schema


@pytest.mark.parametrize(
    "image_width,image_height,polygon_width,polygon_height,max_size,expected_url",
    [
        # No max_size: no resize
        (400, 600, 400, 600, None, "http://something/full/full/0/default.jpg"),
        # max_size equal to the image size, no resize
        (400, 600, 400, 600, 600, "http://something/full/full/0/default.jpg"),
        (600, 400, 600, 400, 600, "http://something/full/full/0/default.jpg"),
        (400, 400, 400, 400, 400, "http://something/full/full/0/default.jpg"),
        # max_size is smaller than the image, resize
        (400, 600, 400, 600, 400, "http://something/full/266,400/0/default.jpg"),
        (400, 600, 200, 600, 400, "http://something/full/266,400/0/default.jpg"),
        (600, 400, 600, 400, 400, "http://something/full/400,266/0/default.jpg"),
        (400, 400, 400, 400, 200, "http://something/full/200,200/0/default.jpg"),
        # max_size above the image size, no resize
        (400, 600, 400, 600, 800, "http://something/full/full/0/default.jpg"),
        (600, 400, 600, 400, 800, "http://something/full/full/0/default.jpg"),
        (400, 400, 400, 400, 800, "http://something/full/full/0/default.jpg"),
    ],
)
def test_element_open_image(
    mocker,
    image_width,
    image_height,
    polygon_width,
    polygon_height,
    max_size,
    expected_url,
):
    open_mock = mocker.patch(
        "arkindex_worker.cache.open_image", return_value="an image!"
    )

    image = CachedImage(
        id=UUID("bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb"),
        width=image_width,
        height=image_height,
        url="http://something",
    )
    elt = CachedElement(
        id=UUID("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa"),
        type="element",
        image=image,
        polygon=[
            [0, 0],
            [image_width, 0],
            [image_width, image_height],
            [0, image_height],
            [0, 0],
        ],
    )

    assert elt.open_image(max_size=max_size) == "an image!"
    assert open_mock.call_count == 1
    assert open_mock.call_args == mocker.call(expected_url)


def test_element_open_image_requires_image():
    with pytest.raises(ValueError) as e:
        CachedElement(id=UUID("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa")).open_image()
    assert str(e.value) == "Element aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa has no image"