Review: Resource Lifecycle

Assume the @maintainer persona. Scope: CRUD, errors, AutoFlex on non-test resource code (internal/service/**/*.go). Loaded from review-pr.

Registration annotations

One above each factory function. Flag missing annotations or factory-name/resource-name mismatches.

Struct embeds

type fooResource struct {
    framework.ResourceWithModel[fooResourceModel]
    framework.WithTimeouts          // only when a timeouts block is present
    framework.WithImportByIdentity  // not WithImportByID for new resources
}

• New resources use framework.WithImportByIdentity. Flag framework.WithImportByID on new resources.
• Use framework.ResourceWithModel[T] (not ResourceWithConfigure).
• Data sources: framework.DataSourceWithModel[T].

CRUD step order

Create: get client → fetch plan → flex.Expand → set tags via input.Tags = getTagsIn(ctx) for tagged resources → AWS Create call → flex.Flatten output back into the plan → wait → resp.State.Set(ctx, plan). Flag Creates that don't read the output back into the plan — computed attributes stay unknown in state.

Read: get client → fetch state → finder → on retry.NotFound(err), append fwdiag.NewResourceNotFoundWarningDiagnostic(err), call resp.State.RemoveResource(ctx), return → flatten → resp.State.Set.

Update: get client → fetch plan and state → diff, d := flex.Diff(ctx, plan, state) → gate on diff.HasChanges() → AWS modify → flatten output back into plan → wait → resp.State.Set(ctx, &plan). Flag updates that always call the API without HasChanges(), or that re-fetch state after the modify.

Omit Update when the API has no update, every attribute has RequiresReplace(), or Create is reused for modify.

Delete: get client → fetch state → build input → AWS delete; silently swallow errs.IsA[*awstypes.ResourceNotFoundException](err) → wait.

Errors

Use smerr/smarterr, never raw resp.Diagnostics.AddError.

• Upstream diagnostics: smerr.AddEnrich(ctx, &resp.Diagnostics, req.Plan.Get(ctx, &plan)) (not the deprecated EnrichAppend).
• API errors: smerr.AddError(ctx, &resp.Diagnostics, err, smerr.ID, plan.Name.String()). Always pass smerr.ID with an identifier — plan.Name in Create, state.ID elsewhere.
• Inside finders/waiters, wrap returned errors with smarterr.NewError(err).
• Detect AWS exceptions with errs.IsA[*awstypes.<Exception>](err) — never type assertions, never strings.Contains(err.Error(), ...).
• Use retry.NotFound(err) for wrapped not-found from the finder layer.

Flag raw resp.Diagnostics.AddError, type assertions on AWS errors, and string-based error matching.

AutoFlex

Use flex.Expand / flex.Flatten for model ↔ SDK conversion. Manual per-field aws.String / aws.ToString is wrong in new Framework code.

• flex.WithFieldNamePrefix("<Thing>") when AWS prefixes its fields (model ID ↔ SDK ThingId).
• AWS plural collections become singular blocks (Parameters ↔ parameter).
• AutoFlex does not copy tags through; see review-tags.
• Update path: flex.Diff(ctx, plan, state) then diff.HasChanges().