improve session storage interface for gsession

RELEASE.2.MD

@@ -40,13 +40,12 @@
 ## 功能改进
 
 1. `ghttp`
-    - 当`WebServer`产生`panic`异常错误时，默认打印调用链堆栈到错误日志中；
     - `Cookie`及`Session`的`TTL`配置数据类型修改为`time.Duration`;
     - 新增允许同时通过`Header/Cookie`传递`SessionId`；
     - 新增`ConfigFromMap/SetConfigWithMap`方法，支持通过`map`参数设置WebServer；
     - 改进默认的`CORS`配置，增加对常见`Header`参数的默认支持；
     - 新增`IsExitError`方法，用于开发者自定义处理`recover`错误处理时，过滤框架本身自定义的非异常错误；
-    - 新增`SetSessionStorage`方法，用于开发者自定义`Session`存储；
+    - 新增`SetSessionStorage`配置方法，用于开发者自定义`Session`存储；
     - `ghttp.Request`新增更多的参数获取方法；
 1. `gdb`
     - 增加对SQL中部分字段的自动转义(`Quote`)功能；
@@ -54,6 +53,7 @@
     - 增加`SetLogger`方法用于开发者自定义数据库的日志打印；
     - 增加`Master/Slave`方法，开发者可自主选择数据库操作执行的主从节点；
     - 增加对`mssql/pgsql/oracle`的单元测试；
+    - `debug`模式支持完整带参数整合的SQL语句调试打印；
     - 增加了更多的功能方法；
 1. `glog`
     - 新增`Default`方法用于获取默认的`Logger`对象；

os/gsession/gsession_session.go

@@ -32,7 +32,7 @@ func (s *Session) init() {
 		s.dirty = gtype.NewBool(false)
 	}
 	if len(s.id) > 0 && s.data == nil {
-		if data := s.manager.storage.Get(s.id); data != nil {
+		if data := s.manager.storage.GetSession(s.id); data != nil {
 			if s.data = gmap.NewStrAnyMapFrom(data, true); s.data == nil {
 				panic("session restoring failed for id:" + s.id)
 			}
@@ -51,6 +51,73 @@ func (s *Session) init() {
 	}
 }
 
+// Set sets key-value pair to this session.
+func (s *Session) Set(key string, value interface{}) error {
+	s.init()
+	if err := s.manager.storage.Set(key, value); err != nil {
+		if err == ErrorDisabled {
+			s.data.Set(key, value)
+		} else {
+			return err
+		}
+	}
+	s.dirty.Set(true)
+	return nil
+}
+
+// Sets batch sets the session using map.
+func (s *Session) Sets(data map[string]interface{}) error {
+	s.init()
+	if err := s.manager.storage.SetMap(data); err != nil {
+		if err == ErrorDisabled {
+			s.data.Sets(data)
+		} else {
+			return err
+		}
+	}
+	s.dirty.Set(true)
+	return nil
+}
+
+// Remove removes key along with its value from this session.
+func (s *Session) Remove(key string) error {
+	if len(s.id) == 0 {
+		return nil
+	}
+	s.init()
+	if err := s.manager.storage.Remove(key); err != nil {
+		if err == ErrorDisabled {
+			s.data.Remove(key)
+		} else {
+			return err
+		}
+	}
+	s.dirty.Set(true)
+	return nil
+}
+
+// Clear is alias of RemoveAll.
+func (s *Session) Clear() error {
+	return s.RemoveAll()
+}
+
+// RemoveAll deletes all key-value pairs from this session.
+func (s *Session) RemoveAll() error {
+	if len(s.id) == 0 {
+		return nil
+	}
+	s.init()
+	if err := s.manager.storage.RemoveAll(); err != nil {
+		if err == ErrorDisabled {
+			s.data.Clear()
+		} else {
+			return err
+		}
+	}
+	s.dirty.Set(true)
+	return nil
+}
+
 // Id returns the session id for this session.
 // It create and returns a new session id if the session id is not passed in initialization.
 func (s *Session) Id() string {
@@ -63,6 +130,9 @@ func (s *Session) Id() string {
 func (s *Session) Map() map[string]interface{} {
 	if len(s.id) > 0 {
 		s.init()
+		if data := s.manager.storage.GetMap(); data != nil {
+			return data
+		}
 		return s.data.Map()
 	}
 	return nil
@@ -72,29 +142,18 @@ func (s *Session) Map() map[string]interface{} {
 func (s *Session) Size() int {
 	if len(s.id) > 0 {
 		s.init()
+		if size := s.manager.storage.GetSize(s.id); size >= 0 {
+			return size
+		}
 		return s.data.Size()
 	}
 	return 0
 }
 
-// Set sets key-value pair to this session.
-func (s *Session) Set(key string, value interface{}) {
-	s.init()
-	s.data.Set(key, value)
-	s.dirty.Set(true)
-}
-
-// Sets batch sets the session using map.
-func (s *Session) Sets(m map[string]interface{}) {
-	s.init()
-	s.data.Sets(m)
-	s.dirty.Set(true)
-}
-
 // Contains checks whether key exist in the session.
 func (s *Session) Contains(key string) bool {
 	s.init()
-	return s.data.Contains(key)
+	return s.Get(key) != nil
 }
 
 // IsDirty checks whether there's any data changes in the session.
@@ -105,22 +164,6 @@ func (s *Session) IsDirty() bool {
 	return s.dirty.Val()
 }
 
-// Remove removes key along with its value from this session.
-func (s *Session) Remove(key string) {
-	s.init()
-	s.data.Remove(key)
-	s.dirty.Set(true)
-}
-
-// Clear deletes all key-value pairs from this session.
-func (s *Session) Clear() {
-	if len(s.id) > 0 {
-		s.init()
-		s.data.Clear()
-		s.dirty.Set(true)
-	}
-}
-
 // Close closes current session and updates its ttl in the session manager.
 // If this session is dirty, it also exports it to storage.
 //
@@ -130,7 +173,7 @@ func (s *Session) Close() {
 		if s.manager.storage != nil {
 			if s.dirty.Cas(true, false) {
 				s.data.RLockFunc(func(m map[string]interface{}) {
-					if err := s.manager.storage.Set(s.id, m); err != nil {
+					if err := s.manager.storage.SetSession(s.id, m); err != nil {
 						panic(err)
 					}
 				})
@@ -144,12 +187,19 @@ func (s *Session) Close() {
 	}
 }
 
+// Get retrieves session value with given key.
+// It returns <def> if the key does not exist in the session if <def> is given,
+// or else it return nil.
 func (s *Session) Get(key string, def ...interface{}) interface{} {
-	if len(s.id) > 0 {
+	if len(s.id) == 0 {
+		return nil
+	}
 	s.init()
-		if v := s.data.Get(key); v != nil {
+	if v := s.manager.storage.Get(key); v != nil {
 		return v
 	}
+	if v := s.data.Get(key); v != nil {
+		return v
 	}
 	if len(def) > 0 {
 		return def[0]

os/gsession/gsession_storage.go

@@ -7,11 +7,29 @@
 package gsession
 
 type Storage interface {
-	// Get returns the session data bytes for given session id.
-	Get(id string) map[string]interface{}
-	// Set updates the content for session id.
+	// Get retrieves session value with given key.
+	// It returns nil if the key does not exist in the session.
+	Get(key string) interface{}
+	// GetMap retrieves all key-value pairs as map from storage.
+	GetMap() map[string]interface{}
+	// GetSize retrieves the size of key-value pairs from storage.
+	GetSize(id string) int
+
+	// Set sets key-value session pair to the storage.
+	Set(key string, value interface{}) error
+	// SetMap batch sets key-value session pairs with map to the storage.
+	SetMap(data map[string]interface{}) error
+
+	// Remove deletes key with its value from storage.
+	Remove(key string) error
+	// RemoveAll deletes all key-value pairs from storage.
+	RemoveAll() error
+
+	// GetSession returns the session data bytes for given session id.
+	GetSession(id string) map[string]interface{}
+	// SetSession updates the content for session id.
 	// Note that the parameter <content> is the serialized bytes for session map.
-	Set(id string, data map[string]interface{}) error
-	// UpdateTTL updates the TTL for session id.
+	SetSession(id string, data map[string]interface{}) error
+	// UpdateTTL updates the TTL for specified session id.
 	UpdateTTL(id string) error
 }

os/gsession/gsession_storage_file.go

@@ -8,6 +8,7 @@ package gsession
 
 import (
 	"encoding/json"
+	"errors"
 	"os"
 	"time"
 
@@ -39,6 +40,7 @@ var (
 	DefaultStorageFileCryptoKey     = []byte("Session storage file crypto key!")
 	DefaultStorageFileCryptoEnabled = false
 	DefaultStorageFileLoopInterval  = time.Minute
+	ErrorDisabled                   = errors.New("this feature is disabled in this storage")
 )
 
 func init() {
@@ -96,8 +98,44 @@ func (s *StorageFile) sessionFilePath(id string) string {
 	return gfile.Join(s.path, id)
 }
 
-// Get return the session data for given session id.
-func (s *StorageFile) Get(id string) map[string]interface{} {
+// Get retrieves session value with given key.
+// It returns nil if the key does not exist in the session.
+func (s *StorageFile) Get(key string) interface{} {
+	return nil
+}
+
+// GetMap retrieves all key-value pairs as map from storage.
+func (s *StorageFile) GetMap() map[string]interface{} {
+	return nil
+}
+
+// GetSize retrieves the size of key-value pairs from storage.
+func (s *StorageFile) GetSize(id string) int {
+	return -1
+}
+
+// Set sets key-value session pair to the storage.
+func (s *StorageFile) Set(key string, value interface{}) error {
+	return ErrorDisabled
+}
+
+// SetMap batch sets key-value session pairs with map to the storage.
+func (s *StorageFile) SetMap(data map[string]interface{}) error {
+	return ErrorDisabled
+}
+
+// Remove deletes key with its value from storage.
+func (s *StorageFile) Remove(key string) error {
+	return ErrorDisabled
+}
+
+// RemoveAll deletes all key-value pairs from storage.
+func (s *StorageFile) RemoveAll() error {
+	return ErrorDisabled
+}
+
+// GetSession return the session data for given session id.
+func (s *StorageFile) GetSession(id string) map[string]interface{} {
 	path := s.sessionFilePath(id)
 	data := gfile.GetBytes(path)
 	if len(data) > 8 {
@@ -123,9 +161,9 @@ func (s *StorageFile) Get(id string) map[string]interface{} {
 	return nil
 }
 
-// Set updates the content for session id.
+// SetSession updates the content for session id.
 // Note that the parameter <content> is the serialized bytes for session map.
-func (s *StorageFile) Set(id string, data map[string]interface{}) error {
+func (s *StorageFile) SetSession(id string, data map[string]interface{}) error {
 	path := s.sessionFilePath(id)
 	content, err := json.Marshal(data)
 	if err != nil {
@@ -151,7 +189,7 @@ func (s *StorageFile) Set(id string, data map[string]interface{}) error {
 	return file.Close()
 }
 
-// UpdateTTL updates the TTL for session id.
+// UpdateTTL updates the TTL for specified session id.
 // It just adds the session id to the async handling queue.
 func (s *StorageFile) UpdateTTL(id string) error {
 	s.updatingIdSet.Add(id)