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refactor: dataset.Add returns View[T] instead of Dataset[T]

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Group-managed datasets must never have Init/Sync/Run called on them.
Rather than patching with NopSyncer, introduce View[T] — a thin wrapper
that exposes only Load(). The compiler now prevents misuse: callers can
read values but cannot drive fetch/reload cycles directly.

Dataset[T] no longer needs a syncer when owned by a Group; View.reload()
delegates to the inner Dataset.reload() for Group.reloadAll().
This commit is contained in:
AJ ONeal 2026-04-20 09:50:48 -06:00
parent 896031b6a8
commit ad5d696ce6
No known key found for this signature in database
3 changed files with 23 additions and 12 deletions
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23
net/dataset/dataset.go
View File

@ -124,13 +124,24 @@ func NewGroup(syncer httpcache.Syncer) *Group {
return &Group{syncer: syncer}
}
// Add registers a new dataset in g and returns it. Fetch and reload are driven
// by the Group — call Init/Run/Sync on g, not on the returned Dataset.
// View is the read-only handle returned by Add. It exposes only Load —
// fetch and reload are driven by the owning Group.
type View[T any] struct {
d *Dataset[T]
}
// Load returns the current value. Returns nil before the Group is initialised.
func (v *View[T]) Load() *T { return v.d.ptr.Load() }
func (v *View[T]) reload() error { return v.d.reload() }
// Add registers a new dataset in g and returns a View. Call Load to read the
// current value. Drive updates by calling Init/Sync/Run on the Group.
// load is a closure capturing whatever paths or config it needs.
func Add[T any](g *Group, load func() (*T, error)) *Dataset[T] {
d := &Dataset[T]{syncer: httpcache.NopSyncer{}, load: load}
g.members = append(g.members, d)
return d
func Add[T any](g *Group, load func() (*T, error)) *View[T] {
v := &View[T]{d: &Dataset[T]{load: load}}
g.members = append(g.members, v)
return v
}
// Init fetches once then reloads all registered datasets.

6
net/ipcohort/cmd/check-ip/blacklist.go
View File

@ -82,9 +82,9 @@ func (s *Sources) Fetch() (bool, error) {
// outbound may be nil if no paths were configured.
func (s *Sources) Datasets() (
g *dataset.Group,
whitelist *dataset.Dataset[ipcohort.Cohort],
inbound *dataset.Dataset[ipcohort.Cohort],
outbound *dataset.Dataset[ipcohort.Cohort],
whitelist *dataset.View[ipcohort.Cohort],
inbound *dataset.View[ipcohort.Cohort],
outbound *dataset.View[ipcohort.Cohort],
) {
g = dataset.NewGroup(s)
if len(s.whitelistPaths) > 0 {

6
net/ipcohort/cmd/check-ip/main.go
View File

@ -185,7 +185,7 @@ func newGeoIPDataset(d *geoip.Downloader, edition, path string) *dataset.Dataset
}
func containsInbound(ip string,
whitelist, inbound *dataset.Dataset[ipcohort.Cohort],
whitelist, inbound *dataset.View[ipcohort.Cohort],
) bool {
if whitelist != nil {
if wl := whitelist.Load(); wl != nil && wl.Contains(ip) {
@ -200,7 +200,7 @@ func containsInbound(ip string,
}
func containsOutbound(ip string,
whitelist, outbound *dataset.Dataset[ipcohort.Cohort],
whitelist, outbound *dataset.View[ipcohort.Cohort],
) bool {
if whitelist != nil {
if wl := whitelist.Load(); wl != nil && wl.Contains(ip) {
@ -256,7 +256,7 @@ func printGeoInfo(ipStr string, cityDS, asnDS *dataset.Dataset[geoip2.Reader]) {
}
}
func cohortSize(ds *dataset.Dataset[ipcohort.Cohort]) int {
func cohortSize(ds *dataset.View[ipcohort.Cohort]) int {
if ds == nil {
return 0
}