add group manager

src/group.go

@@ -0,0 +1,61 @@
+package main
+
+import "sync"
+
+type GroupManager struct {
+	groups map[string]Group
+	mu     sync.Mutex
+}
+
+var groupManagerInstance *GroupManager
+var groupManagerInstanceLock sync.Mutex
+
+func InstanceOfGroupManager() *GroupManager {
+	defer groupManagerInstanceLock.Lock()
+	groupManagerInstanceLock.Lock()
+
+	if groupManagerInstance == nil {
+		groupManagerInstance = &GroupManager{groups: map[string]Group{}}
+	}
+	return groupManagerInstance
+}
+
+func (gm *GroupManager) Add(group Group) MsgGroupCreate {
+	defer gm.mu.Unlock()
+	if _, ok := gm.groups[group.Name]; ok {
+		return MsgGroupCreate{Code: 1, Error: "Name already exists!"}
+	}
+	gm.groups[group.Name] = group
+	gm.mu.Lock()
+	return MsgGroupCreate{}
+}
+
+func (gm *GroupManager) Update(group Group) MsgGroupCreate {
+	defer gm.mu.Unlock()
+	if _, ok := gm.groups[group.Name]; !ok {
+		return MsgGroupCreate{Code: 1, Error: "Group not exists!"}
+	}
+	gm.groups[group.Name] = group
+	gm.mu.Lock()
+	return MsgGroupCreate{}
+}
+
+func (gm *GroupManager) Remove(group Group) MsgGroupCreate {
+	defer gm.mu.Unlock()
+	if _, ok := gm.groups[group.Name]; !ok {
+		return MsgGroupCreate{Code: 1, Error: "Group not exists!"}
+	}
+	delete(gm.groups, group.Name)
+	gm.mu.Lock()
+	return MsgGroupCreate{}
+}
+
+func (gm *GroupManager) List() MsgGroupList {
+	defer gm.mu.Unlock()
+	var result []Group
+	for _, v := range gm.groups {
+		result = append(result, v)
+	}
+	gm.mu.Lock()
+	return MsgGroupList{Groups: result}
+}