The Meshery Adapter Library provides a common and consistent set of functionality that Meshery adapters use for managing the lifecycle, configuration, operation, and performance of cloud native infrastructure. See Introducing MeshKit and the Meshery Adapter Library for more.
The main purpose of the meshery-adapter-library is to
- provide a set of interfaces, some with default implementations, to be used and extended by adapters.
- implement common cross cutting concerns like logging, errors, and tracing
- provide a mini framework implementing the gRPC server that allows plugging in the mesh specific configuration and operations implemented in the adapters.
The library consists of interfaces and default implementations for the main and common functionality of an adapter. It also provides a mini-framework that runs the gRPC adapter service, calling the functions of handlers injected by the adapter code. This is represented in an UML-ish style in the figure below. The library is used in the Consul adapter, and others will follow.
A clear picture of dependencies between packages in a module helps avoid circular dependencies (import cycles), understand where to put code, design coherent packages etc.
Referring to the figure below, the packages config and meshes (which contains the adapter service proto definition)
are at the top of the dependency hierarchy and can be used by any other package. Thinking in layers (L), config
would be in the top layer, L1, adapter in L2, and config/provider in L3. Packages can always be imported and used in lower layers.
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