dify-plugin-daemon/internal/core/plugin_manager/manager.go

package plugin_manager

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"

	"github.com/langgenius/dify-plugin-daemon/internal/core/dify_invocation"
	"github.com/langgenius/dify-plugin-daemon/internal/core/dify_invocation/real"
	"github.com/langgenius/dify-plugin-daemon/internal/core/plugin_manager/media_manager"
	"github.com/langgenius/dify-plugin-daemon/internal/core/plugin_manager/serverless"
	"github.com/langgenius/dify-plugin-daemon/internal/types/app"
	"github.com/langgenius/dify-plugin-daemon/internal/types/entities/plugin_entities"
	"github.com/langgenius/dify-plugin-daemon/internal/utils/cache"
	"github.com/langgenius/dify-plugin-daemon/internal/utils/lock"
	"github.com/langgenius/dify-plugin-daemon/internal/utils/log"
	"github.com/langgenius/dify-plugin-daemon/internal/utils/mapping"
)

type PluginManager struct {
	m mapping.Map[string, plugin_entities.PluginLifetime]

	// max size of a plugin package
	maxPluginPackageSize int64

	// where the plugin finally running
	workingDirectory string

	// where the plugin uploaded but not installed
	packageCachePath string

	// where the plugin finally installed but not running
	pluginStoragePath string

	// mediaManager is used to manage media files like plugin icons, images, etc.
	mediaManager *media_manager.MediaManager

	// register plugin
	pluginRegisters []func(lifetime plugin_entities.PluginLifetime) error

	// localPluginLaunchingLock is a lock to launch local plugins
	localPluginLaunchingLock *lock.GranularityLock

	// backwardsInvocation is a handle to invoke dify
	backwardsInvocation dify_invocation.BackwardsInvocation
}

var (
	manager *PluginManager
)

func NewManager(configuration *app.Config) *PluginManager {
	manager = &PluginManager{
		maxPluginPackageSize: configuration.MaxPluginPackageSize,
		packageCachePath:     configuration.PluginPackageCachePath,
		pluginStoragePath:    configuration.PluginStoragePath,
		workingDirectory:     configuration.PluginWorkingPath,
		mediaManager: media_manager.NewMediaManager(
			configuration.PluginMediaCachePath,
			configuration.PluginMediaCacheSize,
		),
		localPluginLaunchingLock: lock.NewGranularityLock(),
	}

	// mkdir
	os.MkdirAll(configuration.PluginWorkingPath, 0755)
	os.MkdirAll(configuration.PluginStoragePath, 0755)
	os.MkdirAll(configuration.PluginMediaCachePath, 0755)
	os.MkdirAll(configuration.PluginPackageCachePath, 0755)
	os.MkdirAll(filepath.Dir(configuration.ProcessCachingPath), 0755)

	return manager
}

func Manager() *PluginManager {
	return manager
}

func (p *PluginManager) Get(
	identity plugin_entities.PluginUniqueIdentifier,
) plugin_entities.PluginLifetime {
	if v, ok := p.m.Load(identity.String()); ok {
		return v
	}

	// check if plugin is a serverless runtime
	plugin_session_interface, err := p.getServerlessPluginRuntime(identity)
	if err != nil {
		return nil
	}

	return plugin_session_interface
}

func (p *PluginManager) GetAsset(id string) ([]byte, error) {
	return p.mediaManager.Get(id)
}

func (p *PluginManager) Launch(configuration *app.Config) {
	log.Info("start plugin manager daemon...")

	// init redis client
	if err := cache.InitRedisClient(
		fmt.Sprintf("%s:%d", configuration.RedisHost, configuration.RedisPort),
		configuration.RedisPass,
	); err != nil {
		log.Panic("init redis client failed: %s", err.Error())
	}

	invocation, err := real.NewDifyInvocationDaemon(
		configuration.DifyInnerApiURL, configuration.DifyInnerApiKey,
	)
	if err != nil {
		log.Panic("init dify invocation daemon failed: %s", err.Error())
	}
	p.backwardsInvocation = invocation

	// start local watcher
	if configuration.Platform == app.PLATFORM_LOCAL {
		p.startLocalWatcher()
	}

	// launch serverless connector
	if configuration.Platform == app.PLATFORM_AWS_LAMBDA {
		serverless.Init(configuration)
	}

	// start remote watcher
	p.startRemoteWatcher(configuration)
}

func (p *PluginManager) BackwardsInvocation() dify_invocation.BackwardsInvocation {
	return p.backwardsInvocation
}

func (p *PluginManager) SavePackage(plugin_unique_identifier plugin_entities.PluginUniqueIdentifier, pkg []byte) error {
	// save to storage
	pkg_path := filepath.Join(p.packageCachePath, plugin_unique_identifier.String())
	pkg_dir := filepath.Dir(pkg_path)
	if err := os.MkdirAll(pkg_dir, 0755); err != nil {
		return err
	}

	if err := os.WriteFile(pkg_path, pkg, 0644); err != nil {
		return err
	}

	return nil
}

func (p *PluginManager) GetPackage(plugin_unique_identifier plugin_entities.PluginUniqueIdentifier) ([]byte, error) {
	file, err := os.ReadFile(filepath.Join(p.packageCachePath, plugin_unique_identifier.String()))

	if err != nil {
		if os.IsNotExist(err) {
			return nil, errors.New("plugin package not found, please upload it firstly")
		}
		return nil, err
	}

	return file, nil
}

func (p *PluginManager) GetPackagePath(plugin_unique_identifier plugin_entities.PluginUniqueIdentifier) (string, error) {
	return filepath.Join(p.packageCachePath, plugin_unique_identifier.String()), nil
}