add recover function that handles panic

cache.go

@@ -2,6 +2,7 @@ package gcache
 
 import (
  "errors"
+ "fmt"
  "sync"
  "time"
 )
@@ -178,7 +179,12 @@ func buildCache(c *baseCache, cb *CacheBuilder) {
 
 // load a new value using by specified key.
 func (c *baseCache) load(key interface{}, cb func(interface{}, *time.Duration, error) (interface{}, error), isWait bool) (interface{}, bool, error) {
- v, called, err := c.loadGroup.Do(key, func() (interface{}, error) {
+ v, called, err := c.loadGroup.Do(key, func() (v interface{}, e error) {
+ defer func() {
+ if r := recover(); r != nil {
+ e = fmt.Errorf("Loader panics: %v", r)
+ }
+ }()
  return cb(c.loaderExpireFunc(key))
  }, isWait)
  if err != nil {