feat: Implement ServerCallContext #206
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Summary of Changes
Hello @kabir, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request introduces the ServerCallContext object, a crucial component for encapsulating and propagating request-specific contextual information throughout the server's call stack. By porting this concept from a Python implementation, the change aims to standardize how server-side operations access details like user identity and request headers, making the system more robust and extensible for future authentication and authorization features.
Highlights
- New
ServerCallContext: Introduced a newServerCallContextclass to encapsulate request-specific data, including user information and request headers, providing a standardized way to access this context throughout the server. - Context Propagation: Modified the server's request handling flow (
A2AServerRoutes,JSONRPCHandler,RequestHandler,DefaultRequestHandler,RequestContext) to create and propagate theServerCallContextthrough method signatures. - Extensible Context Creation: Added a
CallContextFactoryinterface, allowing for custom injection and creation ofServerCallContextinstances, enhancing flexibility for different authentication and context-gathering strategies. - User Authentication Foundation: Integrated a
Userinterface andUnauthenticatedUsersingleton withinServerCallContext, laying the groundwork for robust user authentication and authorization features. - Python Port: This implementation ports the
ServerCallContextconcept from a Python codebase, aiming for architectural consistency across different language implementations.
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Code Review
This pull request introduces the ServerCallContext to propagate request-scoped data, such as user information and headers, through the request handling pipeline. The implementation involves plumbing the new context object through various layers of the application. The changes are logical and well-contained.
| // TODO Python's impl has | ||
| // state['auth'] = request.auth | ||
| // in jsonrpc_app.py. Figure out what this maps to in what Vert.X gives us |
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There's a TODO comment here about mapping request.auth from the Python implementation. It's important to investigate what this maps to in Vert.x to ensure the authentication information is correctly propagated. Neglecting this could lead to security issues or incorrect user context.
| public ServerCallContext(User user, Map<String, Object> state) { | ||
| this.user = user; | ||
| this.state = state; | ||
| } |
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The state map is stored directly from the constructor argument, and the getter returns the same instance. This allows external code to modify the internal state of ServerCallContext, breaking encapsulation. To make the context immutable, you should store an unmodifiable copy of the map. This will prevent unintended side effects and ensure the context remains consistent throughout the request lifecycle.
| public ServerCallContext(User user, Map<String, Object> state) { | |
| this.user = user; | |
| this.state = state; | |
| } | |
| public ServerCallContext(User user, Map<String, Object> state) { | |
| this.user = user; | |
| this.state = state != null ? Map.copyOf(state) : Map.of(); | |
| } |
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I am not sure at this point whether the intent for this state map is to be mutable or not.
| this.contextId = contextId; | ||
| this.task = task; | ||
| this.relatedTasks = relatedTasks == null ? new ArrayList<>() : relatedTasks; | ||
| this.callContext = callContext; |
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The callContext field is declared as final, ensuring immutability after construction. This is good for preventing unintended modifications to the context within the RequestContext.
It was introduced in a2aproject/a2a-java#206
Port the ServerCallContext from Python
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Port the ServerCallContext from Python