Add DynamoDB backend

2026-03-25 04:57:54 +00:00 · 2021-09-29 16:14:28 +02:00
parent 8a8eb395ec
commit d67797a1d5
4 changed files with 372 additions and 4 deletions
--- a/fastapi_cache/backends/dynamodb.py
+++ b/fastapi_cache/backends/dynamodb.py
@@ -0,0 +1,88 @@
+import datetime
+
+from typing import Tuple
+from aiobotocore.session import get_session
+
+from fastapi_cache.backends import Backend
+
+
+class DynamoBackend(Backend):
+    """
+    Amazon DynamoDB backend provider
+
+    This backend requires an existing table within your AWS environment to be passed during
+    backend init. If ttl is going to be used, this needs to be manually enabled on the table
+    using the `ttl` key. Dynamo will take care of deleting outdated objects, but this is not
+    instant so don't be alarmed when they linger around for a bit.
+
+    As with all AWS clients, credentials will be taken from the environment. Check the AWS SDK
+    for more information.
+    """
+
+    def __init__(self, table_name, region=None):
+        self.session = get_session()
+        self.client = None # Needs async init
+        self.table_name = table_name
+        self.region = region
+
+    async def init(self):
+        self.client = await self.session.create_client('dynamodb', region_name=self.region).__aenter__()
+
+    async def close(self):
+        self.client = await self.client.__aexit__(None, None, None)
+
+    async def get_with_ttl(self, key: str) -> Tuple[int, str]:
+        response = await self.client.get_item(
+            TableName=self.table_name,
+            Key={
+                "key": {
+                    "S": key
+                }
+            }
+        )
+
+        if "Item" in response:
+            value = response["Item"].get("value", {}).get("S")
+            ttl = response["Item"].get("ttl", {}).get("N")
+
+            if not ttl:
+                return -1, value
+
+            # It's only eventually consistent so we need to check ourselves
+            expire = int(ttl) - int(datetime.datetime.now().timestamp())
+            if expire > 0:
+                return expire, value
+
+        return 0, None
+
+    async def get(self, key) -> str:
+        response = await self.client.get_item(
+            TableName=self.table_name,
+            Key={
+                "key": {
+                    "S": key
+                }
+            }
+        )
+        if "Item" in response:
+            return response["Item"].get("value", {}).get("S")
+
+    async def set(self, key: str, value: str, expire: int = None):
+        ttl = { "ttl": { "N": str(int((datetime.datetime.now() + datetime.timedelta(seconds=expire)).timestamp())) } } if expire else {}
+
+        response = await self.client.put_item(
+            TableName=self.table_name,
+            Item={**{
+                "key": {
+                    "S": key
+                },
+                "value": {
+                    "S": value
+                },
+            }, **ttl
+            }
+        )
+
+    async def clear(self, namespace: str = None, key: str = None) -> int:
+        raise NotImplementedError
+
--- a/fastapi_cache/backends/inmemory.py
+++ b/fastapi_cache/backends/inmemory.py
@@ -43,7 +43,7 @@ class InMemoryBackend(Backend):

    async def set(self, key: str, value: str, expire: int = None):
        async with self._lock:
-            self._store[key] = Value(value, self._now + expire)
+            self._store[key] = Value(value, self._now + expire or 0)

    async def clear(self, namespace: str = None, key: str = None) -> int:
        count = 0
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,3 +1,51 @@
+[[package]]
+name = "aiobotocore"
+version = "1.4.1"
+description = "Async client for aws services using botocore and aiohttp"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+aiohttp = ">=3.3.1"
+aioitertools = ">=0.5.1"
+botocore = ">=1.20.106,<1.20.107"
+wrapt = ">=1.10.10"
+
+[package.extras]
+awscli = ["awscli (>=1.19.106,<1.19.107)"]
+boto3 = ["boto3 (>=1.17.106,<1.17.107)"]
+
+[[package]]
+name = "aiohttp"
+version = "3.7.4.post0"
+description = "Async http client/server framework (asyncio)"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+async-timeout = ">=3.0,<4.0"
+attrs = ">=17.3.0"
+chardet = ">=2.0,<5.0"
+multidict = ">=4.5,<7.0"
+typing-extensions = ">=3.6.5"
+yarl = ">=1.0,<2.0"
+
+[package.extras]
+speedups = ["aiodns", "brotlipy", "cchardet"]
+
+[[package]]
+name = "aioitertools"
+version = "0.8.0"
+description = "itertools and builtins for AsyncIO and mixed iterables"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+typing_extensions = {version = ">=3.7", markers = "python_version < \"3.8\""}
+
 [[package]]
 name = "aiomcache"
 version = "0.6.0"
@@ -40,7 +88,7 @@ name = "async-timeout"
 version = "3.0.1"
 description = "Timeout context manager for asyncio programs"
 category = "main"
-optional = true
+optional = false
 python-versions = ">=3.5.3"

 [[package]]
@@ -55,7 +103,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 name = "attrs"
 version = "21.2.0"
 description = "Classes Without Boilerplate"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"

@@ -108,6 +156,30 @@ jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
 python2 = ["typed-ast (>=1.4.2)"]
 uvloop = ["uvloop (>=0.15.2)"]

+[[package]]
+name = "botocore"
+version = "1.20.106"
+description = "Low-level, data-driven core of boto 3."
+category = "main"
+optional = false
+python-versions = ">= 2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
+
+[package.dependencies]
+jmespath = ">=0.7.1,<1.0.0"
+python-dateutil = ">=2.1,<3.0.0"
+urllib3 = ">=1.25.4,<1.27"
+
+[package.extras]
+crt = ["awscrt (==0.11.24)"]
+
+[[package]]
+name = "chardet"
+version = "4.0.0"
+description = "Universal encoding detector for Python 2 and 3"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
 [[package]]
 name = "click"
 version = "8.0.1"
@@ -191,6 +263,14 @@ category = "main"
 optional = false
 python-versions = ">=3.6"

+[[package]]
+name = "idna"
+version = "3.2"
+description = "Internationalized Domain Names in Applications (IDNA)"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+
 [[package]]
 name = "importlib-metadata"
 version = "4.8.1"
@@ -230,6 +310,14 @@ requirements_deprecated_finder = ["pipreqs", "pip-api"]
 colors = ["colorama (>=0.4.3,<0.5.0)"]
 plugins = ["setuptools"]

+[[package]]
+name = "jmespath"
+version = "0.10.0"
+description = "JSON Matching Expressions"
+category = "main"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+
 [[package]]
 name = "mccabe"
 version = "0.6.1"
@@ -238,6 +326,14 @@ category = "dev"
 optional = false
 python-versions = "*"

+[[package]]
+name = "multidict"
+version = "5.1.0"
+description = "multidict implementation"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
 [[package]]
 name = "mypy-extensions"
 version = "0.4.3"
@@ -487,6 +583,19 @@ category = "main"
 optional = false
 python-versions = "*"

+[[package]]
+name = "urllib3"
+version = "1.26.7"
+description = "HTTP library with thread-safe connection pooling, file post, and more."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
+
+[package.extras]
+brotli = ["brotlipy (>=0.6.0)"]
+secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
+socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
+
 [[package]]
 name = "uvicorn"
 version = "0.15.0"
@@ -504,6 +613,27 @@ typing-extensions = {version = "*", markers = "python_version < \"3.8\""}
 [package.extras]
 standard = ["websockets (>=9.1)", "httptools (>=0.2.0,<0.3.0)", "watchgod (>=0.6)", "python-dotenv (>=0.13)", "PyYAML (>=5.1)", "uvloop (>=0.14.0,!=0.15.0,!=0.15.1)", "colorama (>=0.4)"]

+[[package]]
+name = "wrapt"
+version = "1.12.1"
+description = "Module for decorators, wrappers and monkey patching."
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "yarl"
+version = "1.6.3"
+description = "Yet another URL library"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+idna = ">=2.0"
+multidict = ">=4.0"
+typing-extensions = {version = ">=3.7.4", markers = "python_version < \"3.8\""}
+
 [[package]]
 name = "zipp"
 version = "3.5.0"
@@ -518,15 +648,62 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytes

 [extras]
 all = ["aioredis", "aiomcache"]
+dynamodb = []
 memcache = ["aiomcache"]
 redis = ["aioredis"]

 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "59692cc40f546b0a174a2a0cec63d1ba8960bcf4c618ddee588f0adf24620335"
+content-hash = "357bd4908def2e718a48b7f6dd769d497cc4fac4703cc4162be345518c55991f"

 [metadata.files]
+aiobotocore = [
+    {file = "aiobotocore-1.4.1.tar.gz", hash = "sha256:09f06723d1d69c6d407d9a356ca65ab42a5b7b73a45be4b1ed0ed1a6b6057a9f"},
+]
+aiohttp = [
+    {file = "aiohttp-3.7.4.post0-cp36-cp36m-macosx_10_14_x86_64.whl", hash = "sha256:3cf75f7cdc2397ed4442594b935a11ed5569961333d49b7539ea741be2cc79d5"},
+    {file = "aiohttp-3.7.4.post0-cp36-cp36m-manylinux1_i686.whl", hash = "sha256:4b302b45040890cea949ad092479e01ba25911a15e648429c7c5aae9650c67a8"},
+    {file = "aiohttp-3.7.4.post0-cp36-cp36m-manylinux2014_aarch64.whl", hash = "sha256:fe60131d21b31fd1a14bd43e6bb88256f69dfc3188b3a89d736d6c71ed43ec95"},
+    {file = "aiohttp-3.7.4.post0-cp36-cp36m-manylinux2014_i686.whl", hash = "sha256:393f389841e8f2dfc86f774ad22f00923fdee66d238af89b70ea314c4aefd290"},
+    {file = "aiohttp-3.7.4.post0-cp36-cp36m-manylinux2014_ppc64le.whl", hash = "sha256:c6e9dcb4cb338d91a73f178d866d051efe7c62a7166653a91e7d9fb18274058f"},
+    {file = "aiohttp-3.7.4.post0-cp36-cp36m-manylinux2014_s390x.whl", hash = "sha256:5df68496d19f849921f05f14f31bd6ef53ad4b00245da3195048c69934521809"},
+    {file = "aiohttp-3.7.4.post0-cp36-cp36m-manylinux2014_x86_64.whl", hash = "sha256:0563c1b3826945eecd62186f3f5c7d31abb7391fedc893b7e2b26303b5a9f3fe"},
+    {file = "aiohttp-3.7.4.post0-cp36-cp36m-win32.whl", hash = "sha256:3d78619672183be860b96ed96f533046ec97ca067fd46ac1f6a09cd9b7484287"},
+    {file = "aiohttp-3.7.4.post0-cp36-cp36m-win_amd64.whl", hash = "sha256:f705e12750171c0ab4ef2a3c76b9a4024a62c4103e3a55dd6f99265b9bc6fcfc"},
+    {file = "aiohttp-3.7.4.post0-cp37-cp37m-macosx_10_14_x86_64.whl", hash = "sha256:230a8f7e24298dea47659251abc0fd8b3c4e38a664c59d4b89cca7f6c09c9e87"},
+    {file = "aiohttp-3.7.4.post0-cp37-cp37m-manylinux1_i686.whl", hash = "sha256:2e19413bf84934d651344783c9f5e22dee452e251cfd220ebadbed2d9931dbf0"},
+    {file = "aiohttp-3.7.4.post0-cp37-cp37m-manylinux2014_aarch64.whl", hash = "sha256:e4b2b334e68b18ac9817d828ba44d8fcb391f6acb398bcc5062b14b2cbeac970"},
+    {file = "aiohttp-3.7.4.post0-cp37-cp37m-manylinux2014_i686.whl", hash = "sha256:d012ad7911653a906425d8473a1465caa9f8dea7fcf07b6d870397b774ea7c0f"},
+    {file = "aiohttp-3.7.4.post0-cp37-cp37m-manylinux2014_ppc64le.whl", hash = "sha256:40eced07f07a9e60e825554a31f923e8d3997cfc7fb31dbc1328c70826e04cde"},
+    {file = "aiohttp-3.7.4.post0-cp37-cp37m-manylinux2014_s390x.whl", hash = "sha256:209b4a8ee987eccc91e2bd3ac36adee0e53a5970b8ac52c273f7f8fd4872c94c"},
+    {file = "aiohttp-3.7.4.post0-cp37-cp37m-manylinux2014_x86_64.whl", hash = "sha256:14762875b22d0055f05d12abc7f7d61d5fd4fe4642ce1a249abdf8c700bf1fd8"},
+    {file = "aiohttp-3.7.4.post0-cp37-cp37m-win32.whl", hash = "sha256:7615dab56bb07bff74bc865307aeb89a8bfd9941d2ef9d817b9436da3a0ea54f"},
+    {file = "aiohttp-3.7.4.post0-cp37-cp37m-win_amd64.whl", hash = "sha256:d9e13b33afd39ddeb377eff2c1c4f00544e191e1d1dee5b6c51ddee8ea6f0cf5"},
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+    {file = "aiohttp-3.7.4.post0-cp38-cp38-manylinux2014_aarch64.whl", hash = "sha256:64322071e046020e8797117b3658b9c2f80e3267daec409b350b6a7a05041213"},
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+    {file = "aiohttp-3.7.4.post0-cp38-cp38-manylinux2014_ppc64le.whl", hash = "sha256:e54962802d4b8b18b6207d4a927032826af39395a3bd9196a5af43fc4e60b009"},
+    {file = "aiohttp-3.7.4.post0-cp38-cp38-manylinux2014_s390x.whl", hash = "sha256:a00bb73540af068ca7390e636c01cbc4f644961896fa9363154ff43fd37af2f5"},
+    {file = "aiohttp-3.7.4.post0-cp38-cp38-manylinux2014_x86_64.whl", hash = "sha256:79ebfc238612123a713a457d92afb4096e2148be17df6c50fb9bf7a81c2f8013"},
+    {file = "aiohttp-3.7.4.post0-cp38-cp38-win32.whl", hash = "sha256:515dfef7f869a0feb2afee66b957cc7bbe9ad0cdee45aec7fdc623f4ecd4fb16"},
+    {file = "aiohttp-3.7.4.post0-cp38-cp38-win_amd64.whl", hash = "sha256:114b281e4d68302a324dd33abb04778e8557d88947875cbf4e842c2c01a030c5"},
+    {file = "aiohttp-3.7.4.post0-cp39-cp39-macosx_10_14_x86_64.whl", hash = "sha256:7b18b97cf8ee5452fa5f4e3af95d01d84d86d32c5e2bfa260cf041749d66360b"},
+    {file = "aiohttp-3.7.4.post0-cp39-cp39-manylinux1_i686.whl", hash = "sha256:15492a6368d985b76a2a5fdd2166cddfea5d24e69eefed4630cbaae5c81d89bd"},
+    {file = "aiohttp-3.7.4.post0-cp39-cp39-manylinux2014_aarch64.whl", hash = "sha256:bdb230b4943891321e06fc7def63c7aace16095be7d9cf3b1e01be2f10fba439"},
+    {file = "aiohttp-3.7.4.post0-cp39-cp39-manylinux2014_i686.whl", hash = "sha256:cffe3ab27871bc3ea47df5d8f7013945712c46a3cc5a95b6bee15887f1675c22"},
+    {file = "aiohttp-3.7.4.post0-cp39-cp39-manylinux2014_ppc64le.whl", hash = "sha256:f881853d2643a29e643609da57b96d5f9c9b93f62429dcc1cbb413c7d07f0e1a"},
+    {file = "aiohttp-3.7.4.post0-cp39-cp39-manylinux2014_s390x.whl", hash = "sha256:a5ca29ee66f8343ed336816c553e82d6cade48a3ad702b9ffa6125d187e2dedb"},
+    {file = "aiohttp-3.7.4.post0-cp39-cp39-manylinux2014_x86_64.whl", hash = "sha256:17c073de315745a1510393a96e680d20af8e67e324f70b42accbd4cb3315c9fb"},
+    {file = "aiohttp-3.7.4.post0-cp39-cp39-win32.whl", hash = "sha256:932bb1ea39a54e9ea27fc9232163059a0b8855256f4052e776357ad9add6f1c9"},
+    {file = "aiohttp-3.7.4.post0-cp39-cp39-win_amd64.whl", hash = "sha256:02f46fc0e3c5ac58b80d4d56eb0a7c7d97fcef69ace9326289fb9f1955e65cfe"},
+    {file = "aiohttp-3.7.4.post0.tar.gz", hash = "sha256:493d3299ebe5f5a7c66b9819eacdcfbbaaf1a8e84911ddffcdc48888497afecf"},
+]
+aioitertools = [
+    {file = "aioitertools-0.8.0-py3-none-any.whl", hash = "sha256:3a141f01d1050ac8c01917aee248d262736dab875ce0471f0dba5f619346b452"},
+    {file = "aioitertools-0.8.0.tar.gz", hash = "sha256:8b02facfbc9b0f1867739949a223f3d3267ed8663691cc95abd94e2c1d8c2b46"},
+]
 aiomcache = [
    {file = "aiomcache-0.6.0-py3-none-any.whl", hash = "sha256:17d82e0586c8500a7a3dac0fdef67e2d0300c82d4acb1595a9925783b7c382b5"},
    {file = "aiomcache-0.6.0.tar.gz", hash = "sha256:b38062efca87f2e6ac3b406bd816ca790900b03fef1c5c38fa61c18212c38825"},
@@ -559,6 +736,14 @@ black = [
    {file = "black-21.9b0-py3-none-any.whl", hash = "sha256:380f1b5da05e5a1429225676655dddb96f5ae8c75bdf91e53d798871b902a115"},
    {file = "black-21.9b0.tar.gz", hash = "sha256:7de4cfc7eb6b710de325712d40125689101d21d25283eed7e9998722cf10eb91"},
 ]
+botocore = [
+    {file = "botocore-1.20.106-py2.py3-none-any.whl", hash = "sha256:47ec01b20c4bc6aaa16d21f756ead2f437b47c1335b083356cdc874e9140b023"},
+    {file = "botocore-1.20.106.tar.gz", hash = "sha256:6d5c983808b1d00437f56d0c08412bd82d9f8012fdb77e555f97277a1fd4d5df"},
+]
+chardet = [
+    {file = "chardet-4.0.0-py2.py3-none-any.whl", hash = "sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5"},
+    {file = "chardet-4.0.0.tar.gz", hash = "sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa"},
+]
 click = [
    {file = "click-8.0.1-py3-none-any.whl", hash = "sha256:fba402a4a47334742d782209a7c79bc448911afe1149d07bdabdf480b3e2f4b6"},
    {file = "click-8.0.1.tar.gz", hash = "sha256:8c04c11192119b1ef78ea049e0a6f0463e4c48ef00a30160c704337586f3ad7a"},
@@ -587,6 +772,10 @@ h11 = [
    {file = "h11-0.12.0-py3-none-any.whl", hash = "sha256:36a3cb8c0a032f56e2da7084577878a035d3b61d104230d4bd49c0c6b555a9c6"},
    {file = "h11-0.12.0.tar.gz", hash = "sha256:47222cb6067e4a307d535814917cd98fd0a57b6788ce715755fa2b6c28b56042"},
 ]
+idna = [
+    {file = "idna-3.2-py3-none-any.whl", hash = "sha256:14475042e284991034cb48e06f6851428fb14c4dc953acd9be9a5e95c7b6dd7a"},
+    {file = "idna-3.2.tar.gz", hash = "sha256:467fbad99067910785144ce333826c71fb0e63a425657295239737f7ecd125f3"},
+]
 importlib-metadata = [
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 zipp = [
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--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,6 +21,7 @@ uvicorn = "*"
 aioredis = {version = "^2.0", optional = true}
 aiomcache = {version = "*", optional = true}
 pendulum = "*"
+aiobotocore = {version = "^1.4.1", optional = true}

 [tool.poetry.dev-dependencies]
 flake8 = "*"
@@ -36,4 +37,5 @@ build-backend = "poetry.masonry.api"
 [tool.poetry.extras]
 redis = ["aioredis"]
 memcache = ["aiomcache"]
+dynamodb = ["aiobotocore"]
 all = ["aioredis","aiomcache"]