Walkthrough

The pull request introduces a comprehensive update to the Cosmos SDK's inter-module communication architecture, focusing on a new framework using Protocol Buffers. The key innovation is the "Keeper" paradigm, which replaces existing keeper interfaces with generated QueryClient and MsgClient interfaces. A new ModuleKey concept is introduced to enhance security through object capabilities (OCAPs), allowing modules to securely interact and derive sub-account keys. The changes aim to provide a more stable, secure, and flexible approach to module interactions while maintaining backward compatibility.

Changes

Sequence Diagram

sequenceDiagram
    participant ModuleA
    participant ModuleKey
    participant ModuleB
    
    ModuleA->>ModuleKey: Derive Sub-Account Key
    ModuleKey-->>ModuleA: Return Derived Key
    ModuleA->>ModuleB: Invoke Method with Derived Key
    ModuleB-->>ModuleA: Process and Respond

Possibly Related PRs

• docs: update go module link #22037: Updates to Go modules documentation
• docs: update learn/intro #22046: Documentation clarifications on module interactions
• docs: update protobuf links #22182: Protocol Buffers documentation link updates
• docs: update learn/beginner docs #22191: Beginner documentation updates on Msg services and lifecycle methods
• docs: rewrite building module section (1/n) - mm #22724: Rewriting module building documentation
• docs: rewrite building module section (2/n) -- env + core services #22790: Documentation on module environment and core services
• docs: runtime docs #22816: Runtime documentation improvements

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