Feat: aria2 download and transfer in slave node (#1040)

* Feat: retrieve nodes from data table

* Feat: master node ping slave node in REST API

* Feat: master send scheduled ping request

* Feat: inactive nodes recover loop

* Modify: remove database operations from aria2 RPC caller implementation

* Feat: init aria2 client in master node

* Feat: Round Robin load balancer

* Feat: create and monitor aria2 task in master node

* Feat: salve receive and handle heartbeat

* Fix: Node ID will be 0 in download record generated in older version

* Feat: sign request headers with all `X-` prefix

* Feat: API call to slave node will carry meta data in headers

* Feat: call slave aria2 rpc method from master

* Feat: get slave aria2 task status
Feat: encode slave response data using gob

* Feat: aria2 callback to master node / cancel or select task to slave node

* Fix: use dummy aria2 client when caller initialize failed in master node

* Feat: slave aria2 status event callback / salve RPC auth

* Feat: prototype for slave driven filesystem

* Feat: retry for init aria2 client in master node

* Feat: init request client with global options

* Feat: slave receive async task from master

* Fix: competition write in request header

* Refactor: dependency initialize order

* Feat: generic message queue implementation

* Feat: message queue implementation

* Feat: master waiting slave transfer result

* Feat: slave transfer file in stateless policy

* Feat: slave transfer file in slave policy

* Feat: slave transfer file in local policy

* Feat: slave transfer file in OneDrive policy

* Fix: failed to initialize update checker http client

* Feat: list slave nodes for dashboard

* Feat: test aria2 rpc connection in slave

* Feat: add and save node

* Feat: add and delete node in node pool

* Fix: temp file cannot be removed when aria2 task fails

* Fix: delete node in admin panel

* Feat: edit node and get node info

* Modify: delete unused settings

models/policy.go

@@ -37,6 +37,7 @@ type Policy struct {
 
 	// 数据库忽略字段
 	OptionsSerialized PolicyOption `gorm:"-"`
+	MasterID          string       `gorm:"-"`
 }
 
 // PolicyOption 非公有的存储策略属性
@@ -277,6 +278,13 @@ func (policy *Policy) SaveAndClearCache() error {
 	return err
 }
 
+// SaveAndClearCache 更新并清理缓存
+func (policy *Policy) UpdateAccessKeyAndClearCache(s string) error {
+	err := DB.Model(policy).UpdateColumn("access_key", s).Error
+	policy.ClearCache()
+	return err
+}
+
 // ClearCache 清空policy缓存
 func (policy *Policy) ClearCache() {
 	cache.Deletes([]string{strconv.FormatUint(uint64(policy.ID), 10)}, "policy_")