Files
photoprism/internal/config/extensions.go
2025-10-19 21:08:48 +02:00

115 lines
3.5 KiB
Go

package config
import (
"sync"
"sync/atomic"
"time"
"github.com/photoprism/photoprism/pkg/clean"
)
// Stage identifies when an extension should run during the configuration lifecycle.
type Stage string
const (
// StageBoot runs extensions before a database connection is established so they
// can adjust low-level settings such as storage paths or database credentials.
StageBoot Stage = "boot"
// StageInit runs extensions after the database has been opened and runtime
// services are available.
StageInit Stage = "init"
)
var (
extInit sync.Once
extMutex sync.Mutex
extensions atomic.Value
bootInit sync.Once
bootMutex sync.Mutex
bootExtensions atomic.Value
)
// 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
}
// Register registers a new package extension so it runs during the specified stage.
// StageBoot handlers execute before the database connection is opened, whereas
// StageInit handlers run afterwards. Unknown stages are ignored with a warning.
func Register(stage Stage, name string, initConfig func(c *Config) error, clientConfig func(c *Config, t ClientType) Values) {
switch stage {
case StageBoot:
// BootRegister registers a package extension that should run before the
// database connection is established. Use this for hooks that may influence
// DB settings or other early configuration.
bootMutex.Lock()
defer bootMutex.Unlock()
n, _ := bootExtensions.Load().(Extensions)
bootExtensions.Store(append(n, Extension{name: name, init: initConfig, clientValues: clientConfig}))
case StageInit:
extMutex.Lock()
defer extMutex.Unlock()
n, _ := extensions.Load().(Extensions)
extensions.Store(append(n, Extension{name: name, init: initConfig, clientValues: clientConfig}))
default:
log.Warnf("config: invalid extension stage %s", clean.Log(string(stage)))
}
}
// Ext returns all registered extensions for the specified stage.
func Ext(stage Stage) (ext Extensions) {
switch stage {
case StageBoot:
bootMutex.Lock()
defer bootMutex.Unlock()
ext, _ = bootExtensions.Load().(Extensions)
return ext
case StageInit:
extMutex.Lock()
defer extMutex.Unlock()
ext, _ = extensions.Load().(Extensions)
return ext
default:
log.Warnf("config: invalid extension stage %s", clean.Log(string(stage)))
return ext
}
}
// Boot calls the registered extensions before a database connection is
// established. Each extension is executed at most once per process.
func (ext Extensions) Boot(c *Config) {
bootInit.Do(func() {
for _, e := range ext {
start := time.Now()
if err := e.init(c); err != nil {
log.Warnf("config: %s when loading %s boot extension", err, clean.Log(e.name))
} else {
log.Tracef("config: %s boot extension loaded [%s]", clean.Log(e.name), time.Since(start))
}
}
})
}
// Init calls the registered extensions once a database connection has been
// established. Each extension is executed at most once per process.
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 when loading %s extension", err, clean.Log(e.name))
} else {
log.Tracef("config: %s extension loaded [%s]", clean.Log(e.name), time.Since(start))
}
}
})
}