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protocol.go
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protocol.go
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package filesystem
import (
"context"
"fmt"
"time"
"github.com/ltick/tick-framework/module/config"
"github.com/ltick/tick-routing"
)
var (
errInitiate string = "filesystem template: initiate '%s' error"
errOnStartup string = "filesystem template: onStartup '%s' error"
errRegister string = "filesystem template: Register template is nil"
errUse string = "filesystem template: unknown template '%s' (forgotten register?)"
)
var (
defaultProvider string = "file"
)
func NewInstance() *Instance {
return &Instance{
Config: config.NewInstance(),
}
}
type Instance struct {
Config *config.Instance
handlerName string
handler Handler
}
func (this *Instance) Initiate(ctx context.Context) (newCtx context.Context, err error) {
if newCtx, err = this.Config.Initiate(ctx); err != nil {
err = fmt.Errorf(errInitiate, err.Error())
return
}
var configs map[string]config.Option = map[string]config.Option{
"FILESYSTEM_PROVIDER": config.Option{Type: config.String, Default: defaultProvider, EnvironmentKey: "FILESYSTEM_PROVIDER"},
"FILESYSTEM_DEFRAG_CONTENT_INTERVAL": config.Option{Type: config.Duration, Default: 30 * time.Minute, EnvironmentKey: "FILESYSTEM_DEFRAG_CONTENT_INTERVAL"},
"FILESYSTEM_DEFRAG_CONTENT_LIFETIME": config.Option{Type: config.Duration, Default: 24 * time.Hour, EnvironmentKey: "FILESYSTEM_DEFRAG_CONTENT_LIFETIME"},
"FILESYSTEM_LRU_CAPACITY": config.Option{Type: config.Int64, Default: 32 * 1024 * 1024, EnvironmentKey: "FILESYSTEM_LRU_CAPACITY"},
}
if newCtx, err = this.Config.SetOptions(ctx, configs); err != nil {
err = fmt.Errorf(errInitiate, err.Error())
return
}
if err = Register(defaultProvider, NewFileHandler); err != nil {
err = fmt.Errorf(errInitiate, err.Error())
return
}
if err = Register("lruFile", NewLRUFileHandler); err != nil {
err = fmt.Errorf(errInitiate, err.Error())
return
}
return
}
func (this *Instance) OnStartup(ctx context.Context) (newCtx context.Context, err error) {
newCtx = ctx
var provider string = this.Config.GetString("FILESYSTEM_PROVIDER")
if provider == "" {
provider = defaultProvider
}
if err = this.Use(ctx, provider); err != nil {
err = fmt.Errorf(errOnStartup, err.Error())
return
}
return
}
func (this *Instance) OnShutdown(ctx context.Context) (context.Context, error) {
return ctx, nil
}
func (this *Instance) OnRequestStartup(ctx context.Context, c *routing.Context) (context.Context, error) {
return ctx, nil
}
func (this *Instance) OnRequestShutdown(ctx context.Context, c *routing.Context) (context.Context, error) {
return ctx, nil
}
func (this *Instance) Use(ctx context.Context, handlerName string) (err error) {
var handler storageHandler
if handler, err = Use(handlerName); err != nil {
return
}
this.handlerName = handlerName
this.handler = handler()
if err = this.handler.Initiate(ctx, this.Config); err != nil {
return
}
return
}
func (this *Instance) SetContent(key string, content []byte) (err error) {
return this.handler.SetContent(key, content)
}
func (this *Instance) GetContent(key string) (content []byte, err error) {
return this.handler.GetContent(key)
}
func (this *Instance) DelContent(key string) (err error) {
return this.handler.DelContent(key)
}
type Handler interface {
Initiate(ctx context.Context, conf *config.Instance) error
SetContent(key string, content []byte) (err error)
GetContent(key string) (content []byte, err error)
DelContent(key string) (err error)
}
type storageHandler func() Handler
var storageHandlers map[string]storageHandler = make(map[string]storageHandler)
func Register(name string, handler storageHandler) (err error) {
if handler == nil {
err = fmt.Errorf(errRegister)
return
}
var ok bool
if _, ok = storageHandlers[name]; ok {
return
}
storageHandlers[name] = handler
return
}
func Use(name string) (handler storageHandler, err error) {
var ok bool
if handler, ok = storageHandlers[name]; !ok {
err = fmt.Errorf(errUse, name)
return
}
return
}