Add package cluster :

- based on dragonboat lib (https://github.com/lni/dragonboat)
- add extended config with validate
- add backend managment to allow simple implementation for backend simple, cocurrent & disk
- has no backend implemented and must be a lib for a cluster mode of one backend

cluster/errors.go

@@ -0,0 +1,113 @@
+/***********************************************************************************************************************
+ *
+ *   MIT License
+ *
+ *   Copyright (c) 2021 Nicolas JUHEL
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy
+ *   of this software and associated documentation files (the "Software"), to deal
+ *   in the Software without restriction, including without limitation the rights
+ *   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *   copies of the Software, and to permit persons to whom the Software is
+ *   furnished to do so, subject to the following conditions:
+ *
+ *   The above copyright notice and this permission notice shall be included in all
+ *   copies or substantial portions of the Software.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *   SOFTWARE.
+ *
+ *
+ **********************************************************************************************************************/
+
+package cluster
+
+import liberr "github.com/nabbar/golib/errors"
+
+const (
+	ErrorParamsEmpty liberr.CodeError = iota + liberr.MinPkgCluster
+	ErrorParamsMissing
+	ErrorParamsMismatching
+	ErrorLeader
+	ErrorLeaderTransfer
+	ErrorNodeUser
+	ErrorNodeHostNew
+	ErrorNodeHostStart
+	ErrorNodeHostJoin
+	ErrorNodeHostStop
+	ErrorNodeHostRestart
+	ErrorCommandSync
+	ErrorCommandASync
+	ErrorCommandLocal
+	ErrorValidateConfig
+	ErrorValidateCluster
+	ErrorValidateNode
+	ErrorValidateGossip
+	ErrorValidateExpert
+	ErrorValidateEngine
+)
+
+var isCodeError = false
+
+func IsCodeError() bool {
+	return isCodeError
+}
+
+func init() {
+	isCodeError = liberr.ExistInMapMessage(ErrorParamsEmpty)
+	liberr.RegisterIdFctMessage(ErrorParamsEmpty, getMessage)
+}
+
+func getMessage(code liberr.CodeError) (message string) {
+	switch code {
+	case liberr.UNK_ERROR:
+		return ""
+	case ErrorParamsEmpty:
+		return "at least on given parameters is empty"
+	case ErrorParamsMissing:
+		return "at least on given parameters is missing"
+	case ErrorParamsMismatching:
+		return "at least on given parameters is mismatching awaiting type"
+	case ErrorLeader:
+		return "enable to retrieve cluster leader"
+	case ErrorLeaderTransfer:
+		return "enable to transfer cluster leader"
+	case ErrorNodeUser:
+		return "enable to retrieve node user"
+	case ErrorNodeHostNew:
+		return "enable to init new NodeHost"
+	case ErrorNodeHostStart:
+		return "enable to start cluster"
+	case ErrorNodeHostJoin:
+		return "enable to join cluster"
+	case ErrorNodeHostStop:
+		return "enable to stop cluster or node"
+	case ErrorNodeHostRestart:
+		return "enable to restart node properly"
+	case ErrorCommandSync:
+		return "enable to call synchronous command"
+	case ErrorCommandASync:
+		return "enable to call asynchronous command"
+	case ErrorCommandLocal:
+		return "enable to call local command"
+	case ErrorValidateConfig:
+		return "config seems to be not valid"
+	case ErrorValidateCluster:
+		return "cluster config seems to be not valid"
+	case ErrorValidateNode:
+		return "node config seems to be not valid"
+	case ErrorValidateGossip:
+		return "gossip config seems to be not valid"
+	case ErrorValidateExpert:
+		return "expert config seems to be not valid"
+	case ErrorValidateEngine:
+		return "engine config seems to be not valid"
+	}
+
+	return ""
+}