ddb-cache

ddb-cache

A simple interface for caching items in DynamoDB

Example Usage

Samples can be found here in the tests

The library can also be used for crud operations since it implement get, put, update, delete, scan and query. Along with create_backup.

Basic usage is as given below:

def test_put_cache(ddb_cache: DDBCache):
    data = randint(1, 100)  # noqa: S311
    ddb_cache.put_cache({"id": "test_put_cache", "data": data})
    item = ddb_cache.get_item({"id": "test_put_cache"})
    assert item
    assert item["id"] == "test_put_cache"
    assert item["data"] == data
    assert item["ttl"]


def test_put_cache_no_ttl(ddb_cache: DDBCache):
    data = randint(1, 100)  # noqa: S311
    ddb_cache.put_cache({"id": "test_put_cache", "data": data}, with_ttl=False)
    item = ddb_cache.get_item({"id": "test_put_cache"})
    assert item
    assert item["id"] == "test_put_cache"
    assert item["data"] == data
    with pytest.raises(KeyError):
        item["ttl"]


def test_fetch_cache(ddb_cache: DDBCache, init_cache):
    item = ddb_cache.get_item({"id": "test_fetch_cache"})
    assert item
    assert item["id"] == "test_fetch_cache"
    assert item["data"] == "test_fetch_cache"
    ttl = item["ttl"]
    assert ttl
    sleep(1)
    item = ddb_cache.fetch_cache({"id": "test_fetch_cache"})
    assert item
    assert item["id"] == "test_fetch_cache"
    assert item["data"] == "test_fetch_cache"
    with pytest.raises(KeyError):
        item["ttl"]
    item = ddb_cache.get_item({"id": "test_fetch_cache"})
    assert item
    assert item["id"] == "test_fetch_cache"
    assert item["data"] == "test_fetch_cache"
    ttl2 = item["ttl"]
    assert ttl2
    assert ttl != ttl2


def test_fetch_cache_no_ttl_update(ddb_cache: DDBCache, init_cache):
    item = ddb_cache.get_item({"id": "test_fetch_cache"})
    assert item
    assert item["id"] == "test_fetch_cache"
    assert item["data"] == "test_fetch_cache"
    ttl = item["ttl"]
    assert ttl
    item = ddb_cache.fetch_cache({"id": "test_fetch_cache"}, with_ttl=False)
    assert item
    assert item["id"] == "test_fetch_cache"
    assert item["data"] == "test_fetch_cache"
    with pytest.raises(KeyError):
        item["ttl"]
    item = ddb_cache.get_item({"id": "test_fetch_cache"})
    assert item
    assert item["id"] == "test_fetch_cache"
    assert item["data"] == "test_fetch_cache"
    ttl2 = item["ttl"]
    assert ttl2
    assert ttl == ttl2