Utilities for building and testing AWS applications in Python
Project description
awstin
Utilities for building and testing AWS applications in Python.
Lambdas
Production
Lambda events can be given data models that are created from the event and context:
from awstin.awslambda.api import LambdaEvent
class CustomEvent(LambdaEvent):
def __init__(self, request_id, memory_limit):
self.request_id = request_id
self.memory_limit = memory_limit
@classmethod
def _from_event(cls, event, context):
request_id = event["requestContext"]["requestId"]
memory_limit = context["memory_limit_in_mb"]
return cls(request_id, memory_limit)
Lambda handlers can then be created using the lambda_handler
decorator factory, which takes as an input the data model for the lambda event.
from awstin.awslambda.api import lambda_handler
@lambda_handler(CustomEvent)
def handle_custom_event(event):
print(event.request_id)
print(event.memory_limit)
DynamoDB
Production
The DynamoDB
class currently gives dict-like access to boto3 Table
s and their contents.
This requires either the TEST_DYNAMODB_ENDPOINT
(for integration testing) or AWS_REGION
(for production) endpoints to be set.
from awstin.dynamodb.api import DynamoDB
dynamodb = DynamoDB()
# List of available tables
tables = dynamodb.tables
# Access a single table
table = dynamodb["my_table"]
# Tables that only have a partition key can be accessed directly by their
# partition key
item = table["an_item"]
# Full primary key access is also available
item = table[{"primary_key_name": "an_item"}]
Testing
For integration testing, a context manager to create and then tear-down a DynamoDB table is provided. More flexible control over the created table is planned.
from awstin.dynamodb.testing import temporary_dynamodb_table
with temporary_dynamodb_table("table_name", "hashkey_name") as table:
item = {
"hashkey_name": "test_value",
"another_key": 5,
}
table.put_item(item)
SNS
SNS topics can be retrieved by name and published to with the message directly:
from awstin.sns.api import SNSTopic
topic = SNSTopic("topic-name")
message_id = topic.publish("a message")
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