refac: removed 7 direct and 12 indirect go modules for custom code instead

internal/infrastructure/useCases/flightGroup.go

@@ -0,0 +1,45 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/image"
+	"errors"
+	"sync"
+)
+
+var errFlightAbandoned = errors.New("shared call ended without a result")
+
+type flightCall struct {
+	done  chan struct{}
+	value image.VariantFile
+	err   error
+}
+
+type flightGroup struct {
+	mu    sync.Mutex
+	calls map[string]*flightCall
+}
+
+func (g *flightGroup) do(key string, work func() (image.VariantFile, error)) (image.VariantFile, error) {
+	g.mu.Lock()
+	if existing, running := g.calls[key]; running {
+		g.mu.Unlock()
+		<-existing.done
+		return existing.value, existing.err
+	}
+	if g.calls == nil {
+		g.calls = map[string]*flightCall{}
+	}
+	call := &flightCall{done: make(chan struct{}), err: errFlightAbandoned}
+	g.calls[key] = call
+	g.mu.Unlock()
+
+	defer func() {
+		g.mu.Lock()
+		delete(g.calls, key)
+		g.mu.Unlock()
+		close(call.done)
+	}()
+
+	call.value, call.err = work()
+	return call.value, call.err
+}