photoprism/internal/config/extensions.go

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package config
import (
"sync"
"sync/atomic"
"time"
"github.com/photoprism/photoprism/pkg/clean"
)
var (
extInit sync.Once
extMutex sync.Mutex
extensions atomic.Value
)
// Register registers a new package extension.
func Register(name string, initConfig func(c *Config) error, clientConfig func(c *Config, t ClientType) Values) {
extMutex.Lock()
n, _ := extensions.Load().(Extensions)
extensions.Store(append(n, Extension{name: name, init: initConfig, clientValues: clientConfig}))
extMutex.Unlock()
}
// Ext returns all registered package extensions.
func Ext() (ext Extensions) {
extMutex.Lock()
ext, _ = extensions.Load().(Extensions)
extMutex.Unlock()
return ext
}
// Extensions represents a list of package extensions.
type Extensions []Extension
// Extension represents a named package extension with callbacks.
type Extension struct {
name string
init func(c *Config) error
clientValues func(c *Config, t ClientType) Values
}
// Init initializes the registered extensions.
func (ext Extensions) Init(c *Config) {
extInit.Do(func() {
for _, e := range ext {
start := time.Now()
if err := e.init(c); err != nil {
log.Warnf("config: %s in %s extension [%s]", err, clean.Log(e.name), time.Since(start))
} else {
log.Tracef("config: %s extension loaded [%s]", clean.Log(e.name), time.Since(start))
}
}
})
}