Replace iterators with callbacks for progress reporting.#340
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Replace iterators with callbacks for progress reporting.#340
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mirkoCrobu
reviewed
Apr 8, 2026
mirkoCrobu
reviewed
Apr 8, 2026
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| for appStatus, err := range orchestrator.AppStatusEvents(r.Context(), cfg, dockerCli, idProvider) { | ||
| if err != nil { | ||
| sseStream.SendError(render.SSEErrorData{Code: render.InternalServiceErr, Message: err.Error()}) | ||
| continue | ||
| } | ||
| if err := orchestrator.AppStatusEvents(r.Context(), cfg, dockerCli, idProvider, func(appStatus orchestrator.AppInfo) { | ||
| sseStream.Send(render.SSEEvent{Type: "app", Data: appStatus}) | ||
| }); err != nil { | ||
| sseStream.SendError(render.SSEErrorData{Code: render.InternalServiceErr, Message: err.Error()}) |
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what happen now if appstatusEvents returns an error? With iterators, there was a continue, and the SSE streaming stayed alive. Now any error terminate the session?
* internal/orchestrator/orchestrator.go:
- Removed "iter" import
- StartApp, stopAppWithCmd, StopApp, StopAndDestroyApp, cleanAppCacheFiles, RestartApp: changed from returning iter.Seq[StreamMessage] to accepting a cb func(StreamMessage)
parameter
- All yield(msg) calls replaced with cb(msg), and if !yield(msg) { return } patterns simplified to just cb(msg) (early cancellation now relies purely on context)
- StartDefaultApp and DeleteApp: updated internal calls to pass a callback
- RestartApp: uses a stopHadError flag to avoid starting if stop failed
* Callers updated to pass a callback instead of ranging over the iterator:
- internal/api/handlers/app_start.go and app_stop.go
- cmd/arduino-app-cli/app/start.go, stop.go, restart.go, destroy.go
- internal/orchestrator/system.go, cache.go, models.go
- AppStatusEvents now has the signature `func(..., cb func(AppInfo)) error` - The callback only receives the happy-path AppInfo, and any error is returned directly to the caller. - Updated the caller in internal/api/handlers/app_status.go to pass a callback (the old continue becomes a return in the callback body) The old error handling in the streaming phase, is now handled at function exit.
- AppLogs now takes cb func(LogMessage) as last param and returns error - DockerLogConsumer.cb changed from `func(LogMessage) bool` to `func(LogMessage)` - Removed shuttingDown atomic.Bool (the double-check lock for early-stop signalling is no longer needed) - Removed "iter", "sync/atomic", and helpers imports
- SystemResources now takes `cb func(SystemResource)` as last param and
returns `error`.
- All `if !yield(msg) { return }` patterns simplified to `cb(msg)`.
- Removed "iter" and helpers imports.
- NewSSEClient now takes `cb func(Event)` and returns `error` - Context cancellation errors treated as nil (normal termination) - `waitForUpgrade` uses `context.WithCancel` + `cancel()` inside the callback to replace the old break - Made NewSSEClient private
- runUpgradeCommand, runAptCleanCommand, pullDockerImages, cleanupDockerContainers all changed from returning `iter.Seq2[string, error]` to `func(..., cb func(string)) error` - Process kill-on-stop logic removed (context cancellation handles it) - UpgradePackages caller updated accordingly
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Motivation
This pull request refactors the way streaming and event-based APIs are handled throughout the codebase, moving from iterator-based interfaces to callback-based ones. This change simplifies the control flow, improves error handling, and removes the dependency on the
iterpackage. Additionally, related test helpers and internal utilities were updated to match the new approach.Change description
Test and helper code updates:
Dependency and code cleanup:
iter.gohelper and all uses of theiterpackage, since the new callback-based approach makes these utilities unnecessary.Additional Notes
Reviewer checklist
main.