Add Google Cloud Parameter Manager environment repository

Contribution Overview

The Engineering Context

This contribution was made to the spring-cloud/spring-cloud-configopen-source repository. The work involved understanding the existing codebase, identifying the underlying engineering problem, implementing a focused solution, and validating the change against the project's existing behaviour and testing standards.

Original Issue

Add support for Google Cloud Parameter Manager as a Spring Cloud Config environment repository.

Spring Cloud Config needed support for resolving externalized configuration from Google Cloud Parameter Manager through the existing EnvironmentRepository abstraction.

Engineering Problem

Understanding the Problem

Spring Cloud Config supported multiple external configuration backends, but did not provide an EnvironmentRepository implementation for Google Cloud Parameter Manager. Applications using Parameter Manager could not use it as a native configuration source through the Spring Cloud Config Server infrastructure.

Solution

Implementation Approach

Added Google Cloud Parameter Manager support by introducing configuration properties, a GoogleParameterManagerEnvironmentRepository, and a corresponding factory. Registered the repository conditionally when ParameterManagerClient is available, added profile-based activation, and implemented parameter resolution using application and profile labels. Added unit tests covering parameter retrieval and rendering.

Technologies

Engineering Stack