Introduce discriminated FetchError union type to replace weak string error
handling in API calls and hooks. Enables actionable error diagnostics.
Changes:
- Create types/api.ts with FetchError discriminated union (api_error,
network_error, abort_error)
- Export type guards: isAuthError, isAbortError, isNetworkError, isApiError
- Update useListData and usePolledData to expose typed FetchError instead of
string
- Add getErrorMessage() helper to extract displayable messages from FetchError
- Add createStringErrorAdapter() for backward compatibility with string error
state
- Update handleFetchError() to work with both FetchError and string setters
- Update all consumer hooks to expose typed errors
- Update components to use getErrorMessage() when displaying errors
- Update tests to mock FetchError instead of strings
- Add comprehensive typed error model documentation to Web-Development.md
This enables better error handling patterns:
- Check error.type to distinguish between API, network, and abort errors
- Extract status codes for specific handling (401/403 auth, 50x server errors)
- Maintain backward compatibility with existing string-based error states
All TypeScript compilation passes with no errors.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
- Refactor useJails (useJailList.ts) to use useListData with onSuccess for total
- Refactor useBanTrend to use useListData with onSuccess for bucket_size
- Refactor useDashboardCountryData to use useListData with onSuccess for aggregated data
- Refactor useHistory to use useListData with proper abort guard in finally()
- Create usePolledData for single-item endpoints with polling and window focus refetch
- Refactor useServerStatus to use usePolledData for 30s polling + window focus refetch
- Keep useIpHistory with manual pattern (single-item, no list semantics)
- Document deferred refactoring of useJailDetail (depends on T-13 for data/command split)
All data-fetching hooks now follow one of two consistent patterns:
1. useListData: for paginated/list endpoints with refresh semantics
2. usePolledData: for single-item endpoints with polling and focus-refetch
This eliminates code duplication, centralizes abort-guard logic, and enables
consistent fixes across all data-fetching hooks.
Resolves T-12.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Previously, the withRefresh helper and all operations (startJail, stopJail, setIdle, reloadJail, reloadAll) were recreated on every render because they were defined in the hook body without useCallback. This caused unnecessary re-renders of child components using React.memo when parent state changed.
Now each operation is wrapped in useCallback with [load] as its dependency. This ensures function references remain stable between renders, allowing React.memo optimizations to work correctly in JailOverviewSection.
Tests confirm that function references are now stable between consecutive renders.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Add optional signal?: AbortSignal parameter to all API GET functions so they can be
cancelled when components unmount. This prevents state-update warnings and wasted
resources.
Changes:
- frontend/src/api/history.ts: fetchHistory, fetchIpHistory
- frontend/src/api/map.ts: fetchBansByCountry
- frontend/src/api/jails.ts: fetchJails, fetchActiveBans
- frontend/src/api/config.ts: fetchJailConfig, fetchInactiveJails, fetchJailConfigFiles,
fetchFilterFiles (threads signal through fetchFilters), fetchFilterFile, fetchActionFiles,
fetchActionFile
- frontend/src/api/blocklist.ts: fetchImportLog, previewBlocklist
Updated all calling hooks to pass the abort signal from their controllers:
- useHistory, useIpHistory
- useMapData
- useActiveBans
- useJails
- useConfigActiveStatus (fetchJails and fetchJailConfigs)
- useJailAdmin (fetchInactiveJails)
- useJailConfigDetail (fetchJailConfig)
- useImportLog (fetchImportLog)
- useBlocklists (previewBlocklist with AbortController)
Updated Docs/Web-Development.md to document the convention.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
