fix: add UI brand name and enhance error handling in ConnectionFactory and server process#31
fix: add UI brand name and enhance error handling in ConnectionFactory and server process#31
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- Improved error handling in the ConnectionFactory by wrapping event handlers for 'connected', 'disconnected', and 'error' events in try-catch blocks. This change ensures that any exceptions thrown during these events are logged without disrupting the connection process, enhancing the robustness of the connection management. - Added process-level error handlers in the server to manage unhandled promise rejections and uncaught exceptions. This addition prevents the application from crashing due to WebSocket-related errors, allowing it to continue operating in a resilient manner while logging critical issues for further investigation. - These modifications aim to improve the overall stability and maintainability of the application by ensuring that error scenarios are handled gracefully, thus providing a better user experience during network fluctuations.
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Greptile Summary
This PR implements defensive error handling to improve the stability of WebSocket connections and prevent server crashes in the Swush application. The changes focus on two main areas: enhanced error handling in the ConnectionFactory and process-level error management in the server.
In the ConnectionFactory, all event handlers for API connections (connected, disconnected, error) and WebSocket events (close, error) are now wrapped in try-catch blocks. This prevents exceptions thrown during these events from propagating up and potentially crashing the connection management process. The approach ensures that connection state management continues to function even when individual event handlers encounter errors.
At the server level, global process handlers for unhandledRejection and uncaughtException events have been added. These handlers attempt to differentiate between WebSocket-related errors (which the application should survive) and truly fatal errors (which should still cause process termination). The implementation uses string matching to identify WebSocket errors and allows the server to continue operating when these specific errors occur.
This defensive programming approach fits into the broader architecture of a blockchain application that heavily relies on WebSocket connections to multiple Polkadot networks. Given that network instability is common in blockchain environments, maintaining service availability during temporary connection issues is crucial for user experience. The changes complement the existing connection management infrastructure in the packages/api/services/network/ directory, which includes connection pooling, endpoint management, and resilience features.
Important Files Changed
Files Modified
| Filename | Score | Overview |
|---|---|---|
packages/api/services/network/ConnectionFactory.ts |
4/5 | Added try-catch blocks around all event handlers to prevent connection disruption |
packages/api/src/server.ts |
2/5 | Implemented process-level error handlers with string-based WebSocket error detection |
Confidence score: 3/5
- This PR addresses real stability concerns but introduces potential issues with error masking and fragile error detection logic
- Score reflects the defensive approach benefits balanced against the risks of suppressing exceptions and unreliable string-based error matching
- Pay close attention to
packages/api/src/server.tsfor the process-level error handling implementation
Sequence Diagram
sequenceDiagram
participant User
participant Server as Express Server
participant CF as ConnectionFactory
participant API as Polkadot API
participant WS as WebSocket
participant Process as Node Process
User->>Server: "Start Application"
Note over Process: Process-level error handlers setup
Process->>Process: "Setup unhandledRejection handler"
Process->>Process: "Setup uncaughtException handler"
Server->>Server: "Initialize SDK"
Server->>CF: "createHydradxConnection(endpoint, callback)"
CF->>WS: "Create WsProvider"
CF->>API: "Create ApiPromise"
API->>CF: "API ready"
Note over CF: Enhanced event handling with try-catch
CF->>API: "Setup event handlers (connected, disconnected, error)"
CF->>WS: "Setup WebSocket event handlers"
CF->>CF: "Perform stability check"
CF->>Server: "Connection established"
alt Connection Error Occurs
WS->>CF: "WebSocket error/close event"
Note over CF: Try-catch wrapped handler
CF->>CF: "Log error safely"
CF->>Server: "onConnectionEvent('error', error)"
Server->>Server: "Log connection issue"
end
alt Unhandled Promise Rejection
API-->>Process: "Promise rejection"
Process->>Process: "Log rejection reason"
Process->>Process: "Continue operation (no exit)"
end
alt Uncaught Exception
WS-->>Process: "WebSocket-related exception"
Process->>Process: "Check if WebSocket-related"
alt WebSocket Error
Process->>Process: "Log warning, continue operation"
else Fatal Error
Process->>Process: "Log fatal error"
Process->>Process: "Graceful shutdown (exit 1)"
end
end
User->>Server: "API Request"
Server->>CF: "validateConnection()"
CF->>API: "Perform validation query"
alt Validation Fails
API-->>CF: "Query timeout/error"
CF->>CF: "Log validation failure"
CF->>Server: "Return false"
Server->>User: "Service degraded response"
else Validation Success
CF->>Server: "Return true"
Server->>User: "Normal response"
end
2 files reviewed, 1 comment
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Greptile Summary
This review covers only the changes made since the last review (commit 4a13a85), not the entire PR.
The latest changes to this PR introduce a purely cosmetic UI enhancement that appears unrelated to the stated purpose of improving error handling. The only file modified in this latest commit is apps/web/src/app/page.tsx, which adds a Swush logo to the top-left corner of the main swap page.
This change integrates with the existing Next.js web application by using the Next.js Image component for optimized logo rendering. The logo is positioned absolutely with responsive design classes and proper accessibility attributes. The implementation follows standard React/Next.js patterns and fits within the existing component structure of the swap page.
However, this UI modification is completely disconnected from the PR's described focus on ConnectionFactory error handling and server process improvements, suggesting either a mixed commit, incorrect PR description, or changes that should be in a separate PR focused on branding/UI enhancements.
Important Files Changed
Files Changed
| Filename | Score | Overview |
|---|---|---|
apps/web/src/app/page.tsx |
4/5 | Added Swush logo to top-left corner of swap page using Next.js Image component |
Confidence score: 4/5
- This latest change is safe to merge with minimal risk as it's a simple UI addition
- Score reflects that while the code is clean and functional, it's unrelated to the PR's stated purpose which creates confusion
- No files require special attention as this is a straightforward logo addition
1 file reviewed, no comments
muddlebee
changed the title
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