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package image
import (
"fmt"
"sync"
)
// Factory builds a provider instance.
type Factory func() (ImageProvider, error)
// Config exposes the configured image provider name.
type Config interface {
ImageProviderName() string
}
// Registry resolves provider names to factories.
type Registry struct {
mu sync.RWMutex
factories map[string]Factory
}
// NewRegistry creates an empty provider registry.
func NewRegistry() *Registry {
return &Registry{factories: make(map[string]Factory)}
}
// Register associates name with a factory. Later registrations replace earlier ones.
func (r *Registry) Register(name string, factory Factory) {
if r == nil || factory == nil {
return
}
normalized := NormalizeName(name)
if normalized == "" {
return
}
r.mu.Lock()
defer r.mu.Unlock()
if r.factories == nil {
r.factories = make(map[string]Factory)
}
r.factories[normalized] = factory
}
// Resolve returns the factory registered for name.
func (r *Registry) Resolve(name string) (Factory, bool) {
if r == nil {
return nil, false
}
r.mu.RLock()
defer r.mu.RUnlock()
factory, ok := r.factories[NormalizeName(name)]
return factory, ok
}
// New constructs a provider for name.
func (r *Registry) New(name string) (ImageProvider, error) {
var zero ImageProvider
factory, ok := r.Resolve(name)
if !ok {
return zero, fmt.Errorf("%w: %s", ErrUnknownProvider, name)
}
return factory()
}
// NewFromConfig resolves the provider name from cfg and constructs it.
func (r *Registry) NewFromConfig(cfg Config) (ImageProvider, error) {
if cfg == nil {
return nil, fmt.Errorf("image config is required")
}
return r.New(cfg.ImageProviderName())
}
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