aspen-dynamo 0.1.2

Async DynamoDB table helper based on aioboto3.

aspen-dynamo

Async DynamoDB table helper built on aioboto3. It wraps a DynamoDB table resource with small conveniences for key handling, pagination, and optional Pydantic model validation.

Installation

pip install aspen-dynamo

Optional extras:

pip install "aspen-dynamo[benchmark]"

Usage

Create a DynamoDBTable with a boto3 DynamoDB resource:

import aioboto3
from aspen_dynamo import DynamoDBTable

session = aioboto3.Session()

async with session.resource("dynamodb") as resource:
    table = DynamoDBTable("MyTable", "pk", resource=resource)
    item = await table.get_item(123)
    print(item)

Partition + sort key (composite key)

Pass a tuple of attribute names for a table with a partition key and sort key:

import aioboto3
from aspen_dynamo import DynamoDBTable

session = aioboto3.Session()

async with session.resource("dynamodb") as resource:
    table = DynamoDBTable("MyTable", ("pk", "sk"), resource=resource)
    item = await table.get_item(123, "v1")
    print(item)

Usage with a Pydantic model

Provide a model to coerce DynamoDB items into typed objects:

import aioboto3
from pydantic import BaseModel
from aspen_dynamo import DynamoDBTable

class Widget(BaseModel):
    pk: int
    name: str

session = aioboto3.Session()

async with session.resource("dynamodb") as resource:
    table = DynamoDBTable("MyTable", "pk", resource=resource, model=Widget)
    widget = await table.get_item(123)
    print(widget.name)

Benchmark

The benchmark.py script compares aspen-dynamo to other async DynamoDB clients. It uses the same DynamoDBTable API as above:

python -m aspen_dynamo.benchmark MyTable pk 123

Results from two runs:

• uvloop 0.19.0
• aioboto3 13.0.0
• aiobotocore 2.13.0
• aiodynamo 24.7
• aiohttp 3.9.5
• boto3 1.34.106
• httpx 0.28.1

Test	Avg latency 1	Avg latency 2	CPU time 1	CPU time 2
aioboto3 (client)	3.12ms	2.67ms	0.75ms	0.71ms
aioboto3 (resource)	3.39ms	2.64ms	0.80ms	0.78ms
aspen-dynamo	2.61ms	3.24ms	0.78ms	0.79ms
raw request (aiohttp)	2.43ms	2.17ms	0.26ms	0.28ms
aiodynamo (aiohttp)	2.34ms	2.15ms	0.32ms	0.32ms
raw request (httpx)	2.53ms	2.54ms	2.05ms	1.99ms
aiodynamo (httpx)	3.02ms	3.01ms	2.07ms	2.23ms