sub-divisions 1.0.2

AWS EventBridge based PubSub Library

Welcome to Subdivisions

AWS Eventbridge backed PubSub solution

Install in Project

1. Install subdivisions

$ pip install sub-divisions

Configure Project

1. On every project which you will send or receive messages, create a pyproject.toml with the following configuration:

[tool.subdivisions]
source_name = "ProjectName"     # For Eventbridge Schema Discovery
aws_account = ""                # AWS Account Id
aws_user = ""                   # AWS User with sufficient permissions

The source_name are used to inform the Source field in Eventbridge messages. This source will be used on Eventbridge discovery schemas.

The aws_account is the AWS account which will be configured for Eventbridge, KMS, SNS and SQS artifacts.

The aws_user is the user which we will use for create the KMS PubSub Key. To avoid conflicts use the AWS Secret Key and AWS Secret Id from the same user. This account must have the minimum permissions:

• Allow all Eventbridge actions
• Allow all SQS actions
• Allow all SNS actions
• Allow all KMS actions

Usage

Send Messages

from enum import unique, Enum
from subdivisions.client import SubClient

@unique
class MyProjectEvents(Enum):
    MY_EXAMPLE_EVENT = "my_example_event"

client = SubClient()
client.topic = MyProjectEvents.MY_EXAMPLE_EVENT
client.send({"foo": "bar"})

Receive Messages

from enum import unique, Enum
from subdivisions.client import SubClient

@unique
class MyProjectEvents(Enum):
    MY_EXAMPLE_EVENT = "my_example_event"

client = SubClient()
client.topic = MyProjectEvents.MY_EXAMPLE_EVENT
messages = client.get_messages()    # use the ``from_dead_letter=True` to receive Dead Letter messages
# Process messages
client.delete_received_messages()

AWS Credentials

Subdivisions will use AWS default environment variables. If you need to define another credentials, use the following variables:

SUBDIVISIONS_USE_AWS_ENV_VARS="false"
SUBDIVISIONS_AWS_ACCESS_KEY_ID="your id"
SUBDIVISIONS_AWS_SECRET_ACCESS_KEY="your key"
SUBDIVISIONS_AWS_SESSION_TOKEN="your token" # optional

Configuration

Configure subdivisions options in pyproject.toml file, inside [tool.subdivisions] table:

# pyproject.toml
[tool.subdivisions]
aws_region = "us-east-1"            # AWS Region
aws_account = ""                    # AWS Account for configuration/use
aws_user = ""                       # AWS User with sufficient permissions
aws_sqs_policy = ""                 # AWS SQS Policy (default in policies.py)
aws_sns_policy = ""                 # AWS SNS Policy (default in policies.py)
aws_kms_policy = ""                 # AWS KMS Policy (default in policies.py)
pub_key = "PubSubKey"               # KMS PubSubKey (must be created first)
sqs_tags = []                       # SQS tags for new queues. Example [{"foo": "bar"}]
queue_prefix = ""                   # Prefix for new SQS queues
queue_suffix = ""                   # Suffix for new SQS queues
queue_max_receive_count = 1000      # SQS MaxReceiveCount setting
sns_prefix = ""                     # Prefix for new SNS topics
sns_suffix = ""                     # Suffix for new SNS topics
sns_tags = []                       # SNS tags for new topics. Example [{"foo": "bar"}]
event_prefix = ""                   # Prefix for new Eventbride rules
event_suffix = ""                   # Suffix for new Eventbride rules
event_tags = []                     # Eventbridge tags for new rules. Example [{"foo": "bar"}]
event_bus = "default"               # Eventbridge Bus
source_name = ""                    # Eventbridge default source name. No default, must inform
auto_create_new_topic = true        # Auto create new topic if not exists in Eventbridge
auto_remove_from_queue = false      # Acknowledge first messages on receive
use_aws_env_vars = true             # Use AWS default env vars. If false append "SUBDIVISION_" on env vars. Example: "SUBDIVISION_AWS_ACCESS_KEY_ID"
default_prefix = "pubsub"           # Default prefix for all sns, sqs and rule created
default_suffix = ""                 # Default suffix for all sns, sqs and rule created

All options above can be configured in environment variables. Just append SUBDIVISIONS_ on name. Example: SUBDIVISIONS_SOURCE_NAME="my_project"