add time.Duration parameter support for gfcache

g/os/gfcache/gfcache.go

@@ -8,6 +8,8 @@
 package gfcache
 
 import (
+	"time"
+
 	"github.com/gogf/gf/g/internal/cmdenv"
 	"github.com/gogf/gf/g/os/gcache"
 	"github.com/gogf/gf/g/os/gfile"
@@ -27,18 +29,18 @@ var (
 // GetContents returns string content of given file by <path> from cache.
 // If there's no content in the cache, it will read it from disk file specified by <path>.
 // The parameter <expire> specifies the caching time for this file content in seconds.
-func GetContents(path string, expire ...int) string {
-	return string(GetBinContents(path, expire...))
+func GetContents(path string, duration ...interface{}) string {
+	return string(GetBinContents(path, duration...))
 }
 
 // GetBinContents returns []byte content of given file by <path> from cache.
 // If there's no content in the cache, it will read it from disk file specified by <path>.
 // The parameter <expire> specifies the caching time for this file content in seconds.
-func GetBinContents(path string, expire ...int) []byte {
+func GetBinContents(path string, duration ...interface{}) []byte {
 	k := cacheKey(path)
 	e := cacheExpire
-	if len(expire) > 0 {
-		e = expire[0]
+	if len(duration) > 0 {
+		e = getSecondExpire(duration[0])
 	}
 	r := gcache.GetOrSetFuncLock(k, func() interface{} {
 		b := gfile.GetBinContents(path)
@@ -58,7 +60,18 @@ func GetBinContents(path string, expire ...int) []byte {
 	return nil
 }
 
-// 生成缓存键名
+// getSecondExpire converts parameter <duration> to int type in seconds.
+//
+// Note that there's some performance cost in type assertion here, but it's valuable.
+func getSecondExpire(duration interface{}) int {
+	if d, ok := duration.(time.Duration); ok {
+		return int(d.Nanoseconds() / 1000000000)
+	} else {
+		return duration.(int)
+	}
+}
+
+// cacheKey produces the cache key for gcache.
 func cacheKey(path string) string {
 	return "gf.gfcache:" + path
 }