清理代码

pkg/middleware/cache/cache.go

@@ -0,0 +1,48 @@
+package cache
+
+import (
+	"io"
+	"sync"
+	"time"
+
+	"github.com/pkg/errors"
+)
+
+type CacheContent struct {
+	io.ReadSeekCloser
+	Length       int
+	LastModified time.Time
+}
+
+func (c *CacheContent) ReadToString() (string, error) {
+	all, err := io.ReadAll(c)
+	if err != nil {
+		return "", err
+	}
+	return string(all), nil
+}
+
+type Cache interface {
+	Put(key string, reader io.Reader) error
+	// Get return CacheContent or nil when put nil io.reader
+	Get(key string) (*CacheContent, error)
+	Delete(pattern string) error
+	io.Closer
+}
+
+var ErrCacheOutOfMemory = errors.New("内容无法被缓存，超过最大限定值")
+
+// TODO: 优化锁结构
+// 复杂场景请使用其他缓存服务
+
+type CacheMemory struct {
+	l          sync.RWMutex
+	data       map[string]*[]byte
+	lastModify map[string]time.Time
+	sizeGlobal int
+	sizeItem   int
+
+	current int
+	cache   []byte
+	ordered []string
+}