mirror of
https://github.com/c9s/bbgo.git
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126 lines
3.3 KiB
Go
126 lines
3.3 KiB
Go
package bbgo
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import (
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"fmt"
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"reflect"
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log "github.com/sirupsen/logrus"
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"github.com/c9s/bbgo/pkg/service"
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)
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type PersistenceSelector struct {
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// StoreID is the store you want to use.
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StoreID string `json:"store" yaml:"store"`
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// Type is the persistence type
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Type string `json:"type" yaml:"type"`
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}
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// Persistence is used for strategy to inject the persistence.
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type Persistence struct {
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PersistenceSelector *PersistenceSelector `json:"persistence,omitempty" yaml:"persistence,omitempty"`
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Facade *service.PersistenceServiceFacade `json:"-" yaml:"-"`
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}
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func (p *Persistence) backendService(t string) (service.PersistenceService, error) {
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switch t {
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case "json":
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return p.Facade.Json, nil
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case "redis":
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if p.Facade.Redis == nil {
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log.Warn("redis persistence is not available, fallback to memory backend")
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return p.Facade.Memory, nil
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}
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return p.Facade.Redis, nil
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case "memory":
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return p.Facade.Memory, nil
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}
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return nil, fmt.Errorf("unsupported persistent type %s", t)
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}
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func (p *Persistence) Load(val interface{}, subIDs ...string) error {
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ps, err := p.backendService(p.PersistenceSelector.Type)
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if err != nil {
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return err
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}
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log.Debugf("using persistence store %T for loading", ps)
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if p.PersistenceSelector.StoreID == "" {
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p.PersistenceSelector.StoreID = "default"
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}
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store := ps.NewStore(p.PersistenceSelector.StoreID, subIDs...)
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return store.Load(val)
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}
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func (p *Persistence) Save(val interface{}, subIDs ...string) error {
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ps, err := p.backendService(p.PersistenceSelector.Type)
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if err != nil {
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return err
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}
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log.Debugf("using persistence store %T for storing", ps)
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if p.PersistenceSelector.StoreID == "" {
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p.PersistenceSelector.StoreID = "default"
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}
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store := ps.NewStore(p.PersistenceSelector.StoreID, subIDs...)
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return store.Save(val)
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}
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func (p *Persistence) Sync(obj interface{}) error {
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id := callID(obj)
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if len(id) == 0 {
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return nil
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}
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ps := p.Facade.Get()
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return storePersistenceFields(obj, id, ps)
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}
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func loadPersistenceFields(obj interface{}, id string, persistence service.PersistenceService) error {
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return iterateFieldsByTag(obj, "persistence", func(tag string, field reflect.StructField, value reflect.Value) error {
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log.Debugf("[loadPersistenceFields] loading value into field %v, tag = %s, original value = %v", field, tag, value)
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newValueInf := newTypeValueInterface(value.Type())
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// inf := value.Interface()
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store := persistence.NewStore("state", id, tag)
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if err := store.Load(&newValueInf); err != nil {
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if err == service.ErrPersistenceNotExists {
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log.Debugf("[loadPersistenceFields] state key does not exist, id = %v, tag = %s", id, tag)
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return nil
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}
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return err
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}
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newValue := reflect.ValueOf(newValueInf)
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if value.Kind() != reflect.Ptr && newValue.Kind() == reflect.Ptr {
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newValue = newValue.Elem()
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}
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log.Debugf("[loadPersistenceFields] %v = %v -> %v\n", field, value, newValue)
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value.Set(newValue)
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return nil
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})
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}
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func storePersistenceFields(obj interface{}, id string, persistence service.PersistenceService) error {
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return iterateFieldsByTag(obj, "persistence", func(tag string, ft reflect.StructField, fv reflect.Value) error {
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log.Debugf("[storePersistenceFields] storing value from field %v, tag = %s, original value = %v", ft, tag, fv)
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inf := fv.Interface()
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store := persistence.NewStore("state", id, tag)
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return store.Save(inf)
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})
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}
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