store.go

package sessions

import (
	"errors"
	"time"
)

//DefaultSessionDuration is the default duration for
//saving session data in the store. Most Store implementations
//will automatically delete saved session data after this time.
const DefaultSessionDuration = time.Hour

//ErrStateNotFound is returned from Store.Get() when the requested
//session id was not found in the store
var ErrStateNotFound = errors.New("your session has expired")

//Store represents a session data store.
//This is an abstract interface that can be implemented
//against several different types of data stores. For example,
//session data could be stored in memory in a concurrent map,
//or more typically in a shared key/value server store like redis.
type Store interface {
	//Save associates the provided `state`` data with the provided `sid` in the store.
	Save(sid SessionID, state interface{}) error

	//Get retrieves the previously saved state data for the session id,
	//and populates the `state` parameter with it. This will also
	//reset the data's time to live in the store.
	Get(sid SessionID, state interface{}) error

	//Delete deletes all state data associated with the session id from the store.
	Delete(sid SessionID) error
}