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Distributed Transactions Helper

Project description

Tale Distributed Transactions

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Tale is a small library to help write a "distributed transaction like" object across a number of services. It's loosely based on the saga pattern. A good intro is available on the couchbase blog:


pipenv install talepy

Example Usage

An example use case of this would be some holiday booking software broken down into a few services.

Assuming we have the following services: Flight booking API, Hotel booking API, and a Customer API.

We'd write the following steps:

from talepy.steps import Step

class DebitCustomerBalance(Step):

    def __init__(self):
        self.payment_client= {}

    def execute(self, state):
        state['payment_id'] = self.payment_client.bill(state.customer_id, state.payment_amount)
        return state
    def compensate(self, state):

and so on for any of the steps needed. Then in whatever is handling the user's request a distributed transaction can be built:

from talepy import run_transaction


If any step along the way fails then the compensate method on each step is called in reverse order until everything is undone.

Testing / Development


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talepy-0.2.1.tar.gz (2.4 kB view hashes)

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