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|
package image
import (
"fmt"
"reflect"
"sync"
)
// Factory builds a provider instance.
type Factory[C any] func(C) (ImageProvider, error)
// Config exposes the configured image provider name.
type Config interface {
ImageProviderName() string
}
// GeminiRegistryConfig exposes the settings required by the built-in Gemini image provider.
type GeminiRegistryConfig interface {
Config
GoogleAPIKey() string
ImageModel() string
ImageTextModel() string
ComicAspectRatio() string
}
// Registry resolves provider names to factories.
type Registry[C Config] struct {
mu sync.RWMutex
factories map[string]Factory[C]
}
// NewRegistry creates an empty provider registry.
func NewRegistry[C Config]() *Registry[C] {
return &Registry[C]{factories: make(map[string]Factory[C])}
}
// Register associates name with a factory. Later registrations replace earlier ones.
func (r *Registry[C]) Register(name string, factory Factory[C]) {
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[C])
}
r.factories[normalized] = factory
}
// Resolve returns the factory registered for name.
func (r *Registry[C]) Resolve(name string) (Factory[C], bool) {
if r == nil {
return nil, false
}
r.mu.RLock()
defer r.mu.RUnlock()
factory, ok := r.factories[NormalizeName(name)]
return factory, ok
}
// Has reports whether a factory is registered for name.
func (r *Registry[C]) Has(name string) bool {
_, ok := r.Resolve(name)
return ok
}
// New constructs a provider for name.
func (r *Registry[C]) New(name string, cfg C) (ImageProvider, error) {
var zero ImageProvider
factory, ok := r.Resolve(name)
if !ok {
return zero, fmt.Errorf("%w: %s", ErrUnknownProvider, name)
}
return factory(cfg)
}
// NewFromConfig resolves the provider name from cfg and constructs it.
func (r *Registry[C]) NewFromConfig(cfg C) (ImageProvider, error) {
if r == nil {
return nil, fmt.Errorf("image registry is required")
}
if isNilValue(cfg) {
return nil, fmt.Errorf("image config is required")
}
return r.New(cfg.ImageProviderName(), cfg)
}
// DefaultRegistry returns the built-in image provider registry.
func DefaultRegistry() *Registry[GeminiRegistryConfig] {
registry := NewRegistry[GeminiRegistryConfig]()
registry.Register(Gemini, func(cfg GeminiRegistryConfig) (ImageProvider, error) {
geminiProvider := NewGeminiProvider(&GeminiConfig{
APIKey: cfg.GoogleAPIKey(),
Model: cfg.ImageModel(),
TextModel: cfg.ImageTextModel(),
AspectRatio: cfg.ComicAspectRatio(),
})
if err := geminiProvider.IsAvailable(); err != nil {
return nil, err
}
return geminiProvider, nil
})
registry.Register(OpenAI, func(GeminiRegistryConfig) (ImageProvider, error) {
return nil, fmt.Errorf("image provider %q is not implemented", OpenAI)
})
return registry
}
func isNilValue[T any](value T) bool {
v := reflect.ValueOf(value)
if !v.IsValid() {
return true
}
switch v.Kind() {
case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Pointer, reflect.Slice:
return v.IsNil()
default:
return false
}
}
|
